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Subclass of:

399 - Electrophotography

399130000 - IMAGE FORMATION

399297000 - Transfer

399298000 - Color

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DocumentTitleDate
20110176842IMAGE FORMING APPARATUS, CONTROL METHOD THEREOF, AND STORAGE MEDIUM - An image forming apparatus which forms an output image using a transparent colorant and a colored colorant, the apparatus comprises: a formation unit configured to form an adjustment pattern image using the transparent colorant and the colored colorant; an acquisition unit configured to acquire a density value in the formed pattern image; and a calculation unit configured to calculate, based on the acquired density value, a misalignment amount of the transparent colorant with respect to the colored colorant, wherein in the formed pattern image, the area with the transparent colorant are repetitively arranged at first intervals, and the area with the colored colorant are repetitively arranged at second intervals.07-21-2011
20090196662METHOD OF MEASURING A CORRECT LATERAL REGISTRATION SETTING AND PRINTING MACHINE SUITABLE THEREFOR - The invention relates to a method of ensuring a correct lateral registration setting, in a digital multi-color electrographic sheet-printing machine, which the sheets adhere to a support, preferably a transport belt, are transported past printing units.08-06-2009
20090190972BELT DRIVE CONTROL UNIT, BELT DRIVE CONTROL METHOD, BELT DRIVE CONTROL PROGRAM, AND IMAGE FORMING APPARATUS USING SAME - A belt drive control unit controls a rotation of belt supported by first and second rollers. Each of rotations of the first and second rollers are detected as first and second results. A rotation of the first roller is controlled in connection with thickness fluctuation in the belt using the first and second results. The belt drive control unit includes a sampling data acquisition unit, a correction value generator, a correction value storage, and a correction value reading controller. The sampling data acquisition unit obtains sampling data by sampling a difference value between the first and second results. The correction value generator generates correction value data for the belt based on the sampling data. The correction value storage stores the correction value data. The correction value reading controller reads the correction value data based on a rotation number of the belt to control a rotation of the first roller.07-30-2009
20090123196IMAGE FORMING APPARATUS - An image forming apparatus includes: an endless intermediate transferring belt to which a toner image is transferred; a reference position marking member that is formed on a surface of the intermediate transferring belt, and that shows a reference position in a circumferential direction of the intermediate transferring belt; a detecting unit that detects the reference position marking member; and a control unit that controls the intermediate transferring belt to stop at a position where the reference position marking member is exposed to outside in a case where an outer cover is opened.05-14-2009
20100074659IMAGE FORMING METHOD AND APPARATUS - In an electrophotographic color image forming system, including: forming a color image by transferring and superimposing toners of plural colors in a non-fixed state from an image holding member to an intermediate transfer member or a final transfer medium, wherein each toner and the image holding member are selected to provide plots of attachment force F [C] between the toner and the image holding member versus square of charges q03-25-2010
20100074658IMAGE FORMING APPARATUS AND CONTROL METHOD OF IMAGE FORMING APPARATUS - This invention enables an image forming apparatus to perform highly precise misregistration detection without causing increased downtime or increased cost. For this, the image forming apparatus according to the invention comprises a detection unit for detecting a misregistration detection pattern formed on an endless belt. The employed misregistration detection pattern includes a first pattern array formed with a misregistration detection color or a reference position color, and a second pattern array formed with a misregistration detection color or a reference position color. The misregistration detection pattern is configured in a way that the first pattern and the second pattern have different shapes, and that the color order of the first patterns in the first pattern array and the color order of the second patterns in the second pattern array are different.03-25-2010
20130078010IMAGE FORMING APPARATUS - An image forming apparatus includes an adjustment sequence controller that causes first to third adjustment processes to be executed. In the first adjustment process, if a second registration mark having reduced calculation errors of shifts of toner-image formation positions as compared with those of a first registration mark is formed in a normal way, the toner-image formation positions are adjusted by using the second registration mark. In the second adjustment process, if the second registration mark is not formed in the normal way, the toner-image formation positions are adjusted by using the first registration mark. In the third adjustment process, if the second registration mark is formed in the normal way after the second adjustment process, the toner-image formation positions are adjusted by using the second registration mark.03-28-2013
20130039680COLOR IMAGE FORMING APPARATUS AND COLOR MISALIGNMENT ADJUSTING METHOD - According to a color image forming apparatus, a plurality of detection patterns respectively corresponding to a plurality of colors are formed from a plurality of photosensitive body units respectively corresponding to the plurality of colors onto a transfer member in a sub-scanning direction of the transfer member, intervals between detection patterns adjacent to each other in the sub-scanning direction among the plurality of formed detection patterns are detected, and adjustment of color misalignment is performed based on the detected intervals. The plurality of detection patterns have the same size and the same shape. In this color image forming apparatus, the adjustment of color misalignment is performed using at least two types of data of detection images having different intervals as data of detection images including the plurality of detection patterns.02-14-2013
20100104330IMAGE FORMING APPARATUS AND METHOD OF CORRECTING COLOR REGISTRATION - Disclosed are an image forming apparatus capable of, and method of, improving color registration. The image forming apparatus can employ a beam deflector having a double-sided mirror portion that pivots to bi-directionally scan multiple light beams on multiple photosensitive media at different phases by using both mirror sides of the double-sided mirror portion. The individual monochromic images developed on the photosensitive media are transferred onto a transfer medium to overlap one another in phase to form a full color image.04-29-2010
20090290914TRANSFER BELT DRIVING CONTROL METHOD AND TRANSFER BELT DRIVING CONTROL APPARATUS FOR COLOR REGISTRATION CORRECTION - A transfer belt driving control method and transfer belt driving control apparatus for color registration correction. The color registration correction method and apparatus performs the color registration correction by setting a pattern forming section, in which patterns for the color registration correction are able to be formed, and a non-pattern forming section, in which the patterns are not able to be formed, on a transfer belt in which the patterns are formed, performing the color registration correction by driving the transfer belt at a first speed in the pattern forming section, and driving the transfer belt at a second speed, which is faster than the first speed, in the non-pattern forming section.11-26-2009
20130084109IMAGE FORMING APPARATUS - An image forming apparatus can transfer a plurality of color component images onto a surface of a recording medium to form an image on the recording medium. The image forming apparatus includes a pattern generation part to generate information about an alignment pattern to be used for a calibration of an image forming, a plurality of stations each including a photosensitive drum to form an alignment pattern corresponding to each of a plurality of color components onto a carry belt or the recording medium, and a read part to detect a plurality of alignment patterns formed by the plurality of stations.04-04-2013
20100329750BELT DEVICE AND IMAGE FORMING APPARATUS PROVIDED WITH THE SAME - A belt device is provided with an endless belt, a plurality of rollers on which the belt is mounted and including a drive roller connected to a specified drive source and rotating the belt and a belt meandering correction roller correcting the meandering of the belt in a width direction of the belt, a sensor detecting the position of an end surface of the belt in a sensor detection area divided into a plurality of zones adjacent in the belt width direction, a roller position adjusting mechanism adjusting the position of the belt meandering correction roller to correct the meandering of the belt, and a controller controlling the roller position adjusting mechanism based on the position detection of the belt end surface by the sensor, the controller controlling the roller position adjusting mechanism to keep the belt end surface in a specific one of the plurality of zones.12-30-2010
20090304418IMAGE FORMATION DEVICE - An image formation device has an image formation section, a pattern image detection section and a registration correction section. The image formation section forms an image to be outputted and a pattern image on an image-bearing body, the pattern image is formed at a non-image creation region outside an image creation region at which the outputted image is formed. The pattern image detection section detects a position of the pattern image for detecting positional offset of the image. The registration correction section corrects the positional offset based on the detected position of the pattern image.12-10-2009
20090304417IMAGE FORMING APPARATUS - An image forming apparatus has: an image forming section that forms a toner image corresponding to image information; an intermediate transfer belt, which is an endless belt stretched between a plurality of rollers and traveling between the plurality of rollers, the toner image being transferred to a surface thereof or a recording sheet placed on the surface thereof; a driving roller, which is one of the plurality of rollers and drives the intermediate transfer belt; a bending roller, which touches an outer circumferential surface of the intermediate transfer belt and presses and bends the intermediate transfer belt in an inner circumferential direction; and a speed detecting part which detects a movement speed of an outer circumference of the intermediate transfer belt by measuring a rotational speed of the bending roller.12-10-2009
20130058686IMAGE FORMING APPARATUS - An image forming apparatus, including: an image bearing member; a charging device configured to charge a surface of the image bearing member; a power source configured to apply a voltage to the charging device; an exposure device configured to irradiate the surface of the image bearing member with a light beam to form an electrostatic latent image; a developing device configured to develop the latent image into a toner image; and a reading device configured to read a color registration toner image obtained by developing, by the developing device, a color registration electrostatic latent image formed on the surface of the image bearing member by the exposure device within a period from a time when the power source is started up to apply the voltage to the charging device to a time when a potential of the surface of the image bearing member reaches a potential for usual image formation.03-07-2013
20110013949IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND COMPUTER PROGRAM PRODUCT - An image forming apparatus includes a direct transfer control unit that controls a direct transfer unit and a first image forming unit so as to directly transfer an image onto a transfer sheet, an indirect transfer control unit that controls an intermediate transfer unit and a second image forming unit so as to transfer images onto the intermediate transfer unit, a secondary transfer control unit that controls contact/separation between the direct transfer unit and the intermediate transfer unit, a first alignment control unit that corrects an amount of misalignment among the images formed on the intermediate transfer unit, thereby performing a first alignment control process, and a second alignment control unit that corrects an amount of misalignment of an image directly transferred onto the transfer sheet with respect to the image on which the first alignment control process has been performed, thereby performing a second alignment control process.01-20-2011
20090269107Image forming apparatus and image forming method - If a velocity calculated by a velocity calculating unit deviates from a normal range, a target velocity is used as a feedback amount, an actuation amount corresponding to a deviation Ve=0 between the feedback amount Vf=Vt and the target velocity Vt is calculated, and a driving power corresponding to this actuation amount is supplied to a motor. A conveyor belt can be driven stably without causing irregularity in a speed of the conveyor belt.10-29-2009
20090074476POSITIONAL MISALIGNMENT CORRECTING DEVICE AND IMAGE FORMING APPARATUS - A positional misalignment correcting device includes a pattern forming unit that forms a correction pattern and a detecting unit that detects the correction pattern. The detecting unit includes one light emitting element and one light receiving element. The pattern forming unit forms the correction pattern on a transfer member such that a formation area in which the correction pattern is to be formed along a direction perpendicular to a conveying direction of the transfer member is smaller than a light-receiving area of the light receiving element.03-19-2009
20130064580IMAGE FORMING APPARATUS AND METHOD - An image forming apparatus reduces superimposing misalignment due to skew difference and registration difference and superimposing misalignment of visible image due to periodic position error generated on a plurality of latent image carriers respectively by correcting image information. A controller of the image forming apparatus has a deviation amount storing unit store data of magnification error in the sub-scanning direction e, executes rotation posture determining process that sets writing rotation posture as rotation angle posture at the time of starting writing latent image on photoconductors for Y, M, C, and K respectively, and has an image data correcting unit correct the image information based on the determined writing rotation posture and various error data (including magnification error in the sub-scanning direction e).03-14-2013
20130064579IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member, a medium transport member, an image transfer member, a first detection member detecting widthwise deviation of the image bearing member, a first deviation correcting member tiltable relative to the width direction and supporting the image bearing member, a first correction control section tilting the first deviation correcting member to correct deviation of the image bearing member, a second detection member detecting widthwise deviation of the transport member, a second deviation correcting member tiltable relative to the width direction and supporting the transport member, and a second correction control section tilting the second deviation correcting member to correct deviation of the transport member. A width-direction moving amount of the image bearing member per unit time when the first deviation correcting member is tilted is larger than that of the transport member per unit time when the second deviation correcting member is tilted.03-14-2013
20090238613BELT DRIVE CONTROL DEVICE, BELT DEVICE, IMAGE FORMING APPARATUS, AND BELT DRIVE CONTROL METHOD - A belt drive control device includes: first and second detection devices which detect the angular displacement or velocity of a driven rotary member and the angular displacement or velocity of a drive rotary member, respectively; an extraction device which extracts, from the difference between the detection results of the first and second detection devices, the amplitude and phase of a variation component due to belt thickness variation; a control device which controls the rotation of the drive rotary member in accordance with the extracted amplitude and phase; first and second holding devices which hold the extracted amplitude and phase and normal ranges of the amplitude and phase, respectively; and first and second feedback devices which feed back the amplitude and phase to the rotation control, and performs feedback by using a substitution value for the amplitude or phase if the amplitude or phase is out of the normal range, respectively.09-24-2009
20120114395IMAGE FORMING APPARATUS AND COMPUTER READABLE MEDIUM STORING PROGRAM - An image forming apparatus includes a transfer member onto a front side of which an image is transferred, a rotary member around which the transfer member is wrapped, a guide member provided at an end portion of an axial direction of the rotary member, a regulating member, a first reference mark, a second reference mark, a first detector, a second detector, and a controller. The regulating member is located on a reverse side of the transfer member, and restricts skew of the transfer member by contacting the guide member. The first and second reference marks are on edge sides of the transfer member in the axial direction of the rotary member. The first and second detectors detect the first and second reference marks, respectively. The controller controls alignment of the image on the transfer member in accordance with a detection result of the first and second detectors.05-10-2012
20130164048COLOR REGISTRATION SENSOR FOR IMAGE FORMING APPARATUS, METHOD OF DETECTING REGISTRATION TEST PATTERNS BY USING THE COLOR REGISTRATION SENSOR, AND IMAGE FORMING APPARATUS INCLUDING THE COLOR REGISTRATION SENSOR - A color registration sensor of an image forming apparatus, and a method of detecting registration test patterns of a plurality of colors formed on a transfer medium, by using the color registration sensor. The color registration sensor detects a current generated by an electric force of a charged toner forming registration test patterns by using an electrode, as the registration test patterns of a plurality of colors formed on the transfer medium approach the color registration sensor, and detects a location of each of the registration test patterns of the plurality of colors by using a voltage signal obtained by converting the detected current.06-27-2013
20130164047IMAGE FORMING APPARATUS FOR PERFORMING COLOR REGISTRATION CONTROL BASED ON DETECTION RESULT OF PATCH IMAGE - An image forming apparatus includes: an image carrier on which images formed by a plurality of image forming units are transferred; a sensor configured to irradiate the image carrier with light, and detect reflected light; a detection unit configured to detect, based on an output value of the sensor, a feature value of an edge of a patch image which has been formed by the image forming unit and transferred to the image carrier; a determination unit configured to determine a position of the patch image using the output value of the sensor corresponding to the patch image and the feature value of the edge; and a color registration control unit configured to perform color registration control based on the determined position of the patch image.06-27-2013
20110280633IMAGE FORMING APPARATUS - A color image forming apparatus configured to form a combination toner pattern including a second toner image formed downstream in a conveying direction of an intermediate transfer belt on a first toner image and a third toner image formed upstream in the conveying direction of the intermediate transfer belt on the first toner image so that the second and the third toner images cover at least a portion of the first toner image.11-17-2011
20090123197IMAGE FORMING APPARATUS - An image forming apparatus includes first and second image bearing members on which a toner images are to be formed; a conveying member onto which the toner images are to be transferred; a conveying member position index detecting device for detecting a conveying member position index provided on the conveying member along the movement direction of the conveying member; an image bearing member position index detecting device for detecting the image bearing member position indices provided on the second image bearing member along a rotational direction of the second image bearing member; an adjusting device for adjusting a rotational speed of the second image bearing member; a controller for controlling the adjusting device so as to adjust a position of an image bearing member position index correspondingly to the conveying member position index, on the basis of detection results of the conveying member position index detecting device and the image bearing member position index detecting device; and an initializing portion for performing an initializing operation of the adjusting device when an amount of deviation between the conveying member position index and the corresponding image bearing member position index is out of a predetermined range.05-14-2009
20090148198IMAGE FORMING APPARATUS - The bias correction is carried out before the color registration correction is carried out so as to stabilize the running state of the intermediate transfer belt, thereafter the bias correction ceases and the color registration correction is carried out.06-11-2009
20090028614Active station adaptive image registration - A color registration method, system, and computer program product generally includes a plurality of imaging stations and one or more MOB (Marks-On Belt) sensors. An indication is initially provided to each imaging station among the imaging stations, which colors among a plurality of colors associated with said color registration system are active. Next, an arbitrary imaging station among the imaging stations can be assigned as a reference color. Thereafter, the arbitrary imaging station can be instructed to write an appropriate color pattern to replace marks associated with any imaging among imaging stations not enabled with the marks with respect to said reference color in order to thereby produce a resulting color ensemble that is detectable by one or more MOB sensors.01-29-2009
20120107024IMAGE FORMING APPARATUS - An image forming apparatus includes image bearing members; a belt member contacting the image bearing members; electrostatic image forming portions for forming electrostatic images on the image bearing members; developing portions for forming toner images on the basis of the electrostatic images formed on the image bearing members; a first transfer portion for transferring the toner image and an electrostatic image index; a second transfer portion for transferring the toner image onto the belt member; a first detecting portion for detecting the electrostatic image index; a second detecting portion for detecting an electrostatic image index formed on a second image bearing member; an adjusting portion for adjusting a forming operation on the belt member on the basis of outputs of the first and second detecting portions; and a belt member charging portion for electrically charging the belt member before transfer of the electrostatic image index.05-03-2012
20090263167IMAGE FORMING APPARATUS - An image forming apparatus includes plural image forming sections for forming toner images of different colors. A patch toner image forming section forms patch toner images side-by-side onto a moving transfer body by using the image forming sections. A spread clock signal output section spreads a clock signal having a predetermined standard frequency at a predetermined spreading ratio and outputs the clock signal. A patch toner image intervals calculating section calculates intervals between the patch toner images on the transfer body based on the number of clock signals outputted from the spread clock signal output section and the standard frequency. A calculation result correcting section counts spread clock signals outputted during a time interval from the spread clock signal output section, and corrects a calculation result given by the patch toner image intervals calculating section based on the result of the counting.10-22-2009
20110200366METHOD FOR CALIBRATING A PRINTING MACHINE - A method for calibrating a printing machine comprising a plurality of printing units includes transporting a first group of at-least-semi-transparent sheets at least once through the printing units. A second group of at-least-semi-transparent sheets is transported at least twice through the printing units, with the sheets being turned over between passages. Registration marks are printed on one of the sheets of the first group of sheets, and on one of the sheets of the second group of sheets during their second passage through the printing units. No registration marks are printed on the sheets of the second group of sheets during their first passage through the printing units. The registration marks are measured at a registration sensor located downstream of the printing units. Calibration parameters are determined using the measurements of the first and second registration marks provided by the registration sensor.08-18-2011
20090016785Use of a sense mark to control a printing system - A method of printing on a substrate includes the steps of instructing a first imaging unit to print a first image and a registration mark on a substrate contemporaneously during a production run and detecting the registration mark. The method further includes the steps of determining a position on the substrate where a second image is to be printed in accordance with the detection of the registration mark and instructing a second imaging unit to print the second image on the substrate in accordance with the determined position.01-15-2009
20080240797Image Forming Apparatus - During a first operation, at least one of a first pattern and a second pattern is formed on a first area of an image carrier, and at least the other pattern is formed on a second area of the image carrier. The first area corresponds to a half of the image carrier, while the second area corresponds to the remaining half of the image carrier. During a second operation, a second pattern is formed on an area of the image carrier where a first pattern is formed during the first operation, and a first pattern is formed on an area of the image carrier where a second pattern is formed during the first operation.10-02-2008
20110026979Image Forming Apparatus - An image forming apparatus is provided. The image forming apparatus includes a moving body which moves in a moving direction; a plurality of formation units which are provided to oppose the moving body, respectively, and align in an alignment direction, and which sequentially form images directly on the moving body or an image forming medium transported on the moving body; a detection section which outputs a detection signal corresponding to a position of a mark which is formed directly on the moving body or the image forming medium by each of the formation units; and a measurement section which specifies a positional relationship between marks formed by at least two formation units based on the detection signal from the detection section, and which measures a deviation angle between the moving direction of the moving body and the alignment direction of the formation units based on the specified positional relationship.02-03-2011
20080273903IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - A pattern forming unit forms a color-misalignment detection pattern on an image carrier. A light-intensity detecting unit detects the color-misalignment detection pattern formed on the image carrier by irradiating the image carrier with a light and detecting light intensity of a reflected light from the image carrier. A color-misalignment-amount detecting unit detects an amount of a color misalignment of an image based on the light intensity of the reflected light detected by the light-intensity detecting unit. A spot of the light on the image carrier is elongated in a main-scanning direction.11-06-2008
20080273902IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - A pattern forming unit forms a pattern for correcting a position shift of an image. A detecting unit detects the pattern. A measuring unit measures a time from a start of a control signal for controlling timing to start forming the image until a detection of the pattern. A control unit controls a position of forming the image based on the time measured by the measuring unit.11-06-2008
20080292369IMAGING FORMING APPARATUS AND METHOD OF CONTROLLING SAME - An image forming apparatus has a function for adjusting the position at which a toner image is formed on a printing material, based upon amount of light reflected from a toner image that has been formed on an image carrier. The light-emitting unit emits light that irradiates the image carrier, and the detecting unit detects an amount of substrate-light reflected from the substrate of the image carrier. The determining unit determines whether the difference between the amount of substrate-light detected at a first point in time and the amount of substrate-light detected at a second point in time later than the first point in time is greater than a predetermined threshold value. The light-power control unit increases the amount of light in the light-emitting unit if the difference is greater than the predetermined threshold value.11-27-2008
20080279599COLOR IMAGE FORMING APPARATUS, COLOR IMAGE FORMING METHOD, COMPUTER PROGRAM PRODUCT - An out-of-color registration table containing a correspondence of amounts of out-of-color registration detected by an out-of-color-registration amount detector and machine states detected by a machine state detector is prepared. The out-of-color registration table is updated when there is a change in the current machine state.11-13-2008
20100135702METHOD AND APPARATUS FOR MEASURING COLOR-TO-COLOR REGISTRATION - In one embodiment, a method of measuring color-to-color registration includes: a) marking test pattern images on an image receiving member using a reference color separation station and a first color separation station over a process direction span in relation to selected target media and a cyclic characteristic of a multicolor marking platform, b) detecting each test pattern image, c) determining a registration measurement associated with the first color separation in relation to the reference color separation for each test pattern image, and d) determining a repeatable registration error pattern associated with the first color separation and the selected target media in relation to the cyclic characteristic based at least in part on the registration measurements determined in c). In one embodiment, the multicolor marking platform includes a marking engine, a controller, an image receiving member, a sensor, color registration measurement logic, and repeatable registration error determining logic.06-03-2010
20080240798Image-Forming Device - An image-forming device includes 1st to Mth photosensitive drums, a forming unit, an image-carrying member, a detecting unit, and a calibrating unit. The 1st to Mth photosensitive drums are arrayed in numeric order in a first direction. Each of the photosensitive drums is rotatable and has a circumferential length D. M is an integer no less than 1. The forming unit forms a registration mark on each of the photosensitive drums. Each of the registration marks formed on each of the photosensitive drums has a color different from one another. The image-carrying member extends in the first direction. The registration marks formed on the photosensitive drums are transferred onto the image-carrying member in the numeric order. The registration marks transferred onto the image-carrying member are arrayed in the first direction. Neighboring registration marks are spaced by a distance L in the first direction. The detecting unit detects positions of the registration marks transferred onto the image-carrying member. The calibrating unit calibrates positions of the photosensitive drums at which the forming unit forms the registration marks, based on the positions detected by the detecting unit. D=N×M×L+(M−1)×L, N being an integer no less than 0.10-02-2008
20090162112IMAGE FORMING APPARATUS - A controlling section controls an image forming section to form a calibration pattern on an object. The calibration pattern includes a plurality of first patterns and a plurality of second patterns. Each of the first patterns includes at least one pair of marks. Each of the at least one pair of marks has different colors and overlaps with each other in a first direction. The first patterns have different degrees of overlapping from each other. Each of the second patterns is formed between one of the first patterns and another one of the first patterns in the moving direction. The detecting section detects the first and second patterns formed on the object. The correcting section corrects the image forming position in the first direction based on detection results of the first patterns, and corrects the image forming position in a second direction based on detection results of the second patterns.06-25-2009
20090162110IMAGE FORMING APPARATUS - A controlling section controls an image forming section to form a calibration pattern on an object. The calibration pattern includes a plurality of marks in first and second groups. The marks in the second group are formed at a different position in the second direction from the marks in the first group. The marks in each of the first and second groups are arranged in the first direction over a predetermined range on the object. Each mark has shape and color. The detecting section detects the calibration pattern formed on the object, thereby obtaining detection results. The correcting section corrects, based on the detection results, an image forming position at which the image forming section forms an image. The marks belonging to different groups and having a same color are formed at different positions with respect to the first direction in at least part of the predetermined range.06-25-2009
20090035030IMAGE FORMING APPARATUS AND AUTO COLOR REGISTRATION METHOD THEREOF - A color registration method of an image forming apparatus, including forming a plurality of front detection marks corresponding to a plurality of colors on a transfer belt, forming a first rear detection mark to at least one of the plurality of colors, except at least one of the plurality of colors, using a color registration reference, and performing auto color registration (ACR) to align the colors on the basis of the first rear detection mark.02-05-2009
20110229219IMAGE FORMING APPARATUS - An image forming apparatus includes a direct transfer part moving color adjustment patterns of a single color formed on a photosensitive drum to a direct transfer member; a secondary transfer part that moves the color adjustment patterns of the single color moved to the direct transfer member to an intermediate transfer member; a primary transfer part that moves color adjustment patterns of plural colors formed on plural photopositive drums to the intermediate transfer member; a detection part that detects the color adjustment patterns of the single color moved to the intermediate transfer member and the color adjustment patterns of the plural colors moved to the intermediate transfer member; and a color adjustment part that carries out the color adjustment of the respective printing images based on information of the color adjustment patterns of the single color and the plural colors detected by the detection part.09-22-2011
20090003893Image Forming Apparatus and Correction Method of Color-Misregistration in an Image - An image forming apparatus that corrects color misregistration of an image including: an image forming device having an endless image carrier for carrying an image to be formed on the recording medium, wherein the image forming device forms the image in an image area that corresponds to the recording medium on the image carrier and also forms a color misregistration correction mark in an image boundary area that is sandwiched between the image area and the next image area following the image area on the image carrier; a mark detecting section for detecting the correction mark on the image boundary area; and a control device to change an interval for feeding the recording medium based on a fluctuating period of the color misregistration corresponding to an orbiting distance of the image carrier, and to expand image boundary area of the image carrier to form the mark at a changed position.01-01-2009
20100014896USE OF XEROGRAPHIC IMAGES AND A FULL-WIDTH ARRAY SENSOR FOR MULTIPLE CONTROL SYSTEM SENSING - A method for monitoring an image printing system that prints color images on an image bearing surface movable in a process direction is provided. The method includes placing marking material to form a row comprising a plurality of registration marks on the image bearing surface, wherein each row of registration marks extends along a cross-process direction transverse to the process direction; detecting a position of each registration mark using a linear array sensor extending in the cross-process direction, wherein the position of each registration mark is detected in both the process and cross-process direction; determining a process direction misregistration between the registration marks of each row in the process direction and cross-process direction misregistration between registration marks from each of the rows.01-21-2010
20090252540IMAGE FORMING APPARATUS - An image forming apparatus include: a plurality of photosensitive drums; a latent image forming unit for forming an electrostatic latent image on each photosensitive drum; a developing unit for developing each electrostatic latent image; a transferring unit for superimposing and transferring the developed images onto a moving record medium; a measurement unit for measuring positions of the transferred images on the record medium; and a control unit for controlling the photosensitive drums, the latent image forming unit, the developing unit, and the transferring unit. The control unit includes: a calculating unit for calculating a value related to alignment errors in the positions measured by said measurement unit in accordance with a sine-curve fitting method; and a correcting unit for correcting the alignment errors by the calculated value.10-08-2009
20120195650IMAGE FORMING APPARATUS - An image forming apparatus corrects, for uneven density caused by uneven rotation of a rotation speed of a rotation member, and diffuses so as to reduce the uneven density, for a pixel of interest whose density exceeds the upper limit of the output density out of the pixels of the corrected image data, the excess of the density more than the upper limit to a plurality of peripheral pixels while maintaining the center of gravity of the density.08-02-2012
20100178084IMAGE FORMING APPARATUS AND AUTO COLOR REGISTRATION METHOD THEREOF - An image forming apparatus and an auto color registration method thereof. The image forming apparatus performs an auto color registration (ACR) operation by excluding or minimizing the influence caused by variation in speed of a drive unit driving a transfer member. The image forming apparatus includes a controller, which prints a test pattern of each color according to a rotation period of the drive unit, and controls an operation for outputting an image in which each color registration error is corrected on the basis of the test pattern, such that a reliability of the ACR operation is increased and a quality of an image output from the image forming apparatus is also increased.07-15-2010
20100178083IMAGE FORMING APPARATUS AND AUTO COLOR REGISTRATION METHOD THEREOF - An image forming apparatus and an auto color registration method thereof, the auto color registration (ACR) method including: transferring test patterns respectively corresponding to a plurality of colors; detecting the transferred test patterns; cleaning the transferred test patterns; transferring patterns respectively corresponding to the plurality of colors by reducing a width of a pattern corresponding to a color, from among the plurality of colors, according to the detected test patterns; and performing ACR on the basis of the transferred pattern. Accordingly, at least one pattern width is reduced in consideration of deviation in a detected pattern width between a plurality of colors, and ACR is performed on the basis of the reduced pattern width, thereby decreasing an error and increasing reliability in the ACR.07-15-2010
20100226694IMAGE FORMING APPARATUS - An image forming apparatus includes: a plurality of image forming units as defined herein; an image carrier as defined herein; a first operation controlling unit as defined herein; a second operation controlling unit as defined herein; a density detecting sensor that detects densities of the images formed on the image carrier; a measuring unit that binarizes a density detection output of the image position deviation correction patterns formed on the image carrier, from the density detecting sensor, and that measures intervals between color patterns of the image position deviation correction patterns, based on the binarized output; and a position deviation correction controlling unit that performs a position deviation correcting control of, when the intervals measured by the measuring unit and of the color patterns in the image position deviation correction patterns are deviated from a predetermined range, correcting position deviation of the toner images formed by the image forming units.09-09-2010
20100226695IMAGE FORMING APPARATUS - An image forming apparatus includes a plurality of image forming units that form toner images in different color; an image carrier which carries the toner image of each color; a determination unit that determines, in relation to a size of image data instructed to print, whether or not a first area where a misregistration correcting image is formed at an end portion in a width direction of the image carrier is secured; a first control unit that controls the image forming unit; and a detection sensor that detects the misregistration correcting image formed on the image carrier by controlling of the first control unit; wherein the misregistration of the toner image formed by each image forming unit is corrected on a basis of a value detected by the detection sensor.09-09-2010
20130189000IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus and a control method enhancing ACR (Auto Color Registration) performance by optimizing ACR patterns are provided. The apparatus includes a photosensitive drum, an exposure unit to radiate the drum to form an latent image, a developing unit supplying color toner corresponding to the latent image, and a transfer belt to which the toner image is transferred. A pattern generating unit forms a latent image corresponding to a predetermined ACR pattern on the drum to form the ACR pattern on the transfer belt, and allowing amounts of gap changes of sub patterns, which form the ACR pattern, to have an average value of about 0, the gap change of sub patterns caused by an AC component generated from a rotation of the drum. A pattern detecting unit detects a pattern formed on the transfer belt, and an ACR executing unit calculates offsets to correct errors.07-25-2013
20090162111IMAGE FORMING APPARATUS - An image forming apparatus includes an image forming section, a controlling section, a detecting section, and a correcting section. The image forming section forms an image on an object. The controlling section controls the image forming section to form a calibration pattern on the object. The calibration pattern includes a plurality of marks in a first group and a plurality of marks in a second group. The plurality of marks in each of the first group and the second group is arranged in a first direction over a predetermined range. The plurality of marks in each of the first group and the second group includes first marks and second marks. The first mark in the first group corresponds to the second mark in the second group in a second direction different from the first direction in at least part of the predetermined range. The first mark in the second group corresponds to the second mark in the first group in the second direction in at least part of the predetermined range. The detecting section detects the first mark and the second mark formed on the object. The correcting section corrects, based on the detected first mark, a deviation in the first direction of an image forming position at which the image forming section forms an image, and corrects, based on the detected second mark, a deviation in the second direction of the image forming position.06-25-2009
20100303514IMAGE FORMING APPARATUS, IMAGE FORMING METHOD FOR IMAGE FORMING APPARATUS, AND PROGRAM - There are provided an image forming apparatus, an image forming method for the image forming apparatus, and a program that can reduce misalignment among images in all colors.12-02-2010
20100303513IMAGE FORMING APPARATUS - An image forming apparatus includes a rotatable belt member; a stretching roller for stretching the belt member; a plurality of line-like marks which are arranged in a rotational direction of the belt member and are formed stepwisely on a surface of the belt member; the marks being tilted from a rotational axis direction of the belt member at least at end portions thereof on sides close to an end surface of the belt member; and control means for controlling rotation of the belt member on the basis of a result of detection of the marks.12-02-2010
20110123235IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus includes toner-image forming units, an intermediate transfer body, a controller, a detector, an instruction acceptance unit, and a memory. The toner-image forming units form toner images. The toner images are transferred onto the intermediate transfer body. The controller performs control of causing, among the toner-image forming units, one or multiple toner-image forming units to be used to form the toner images to contact the intermediate transfer body, and of separating the other toner-image forming units from the intermediate transfer body. The detector detects a test pattern formed by the toner forming units. The instruction acceptance unit accepts an instruction for performing a detection process with the detector. The memory stores, among forming modes indicating combinations of toner-image forming units to be used, a first forming mode for forming an image and a second forming mode for forming the test pattern.05-26-2011
20100303512IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND PROGRAM - A first alignment control unit causes a secondary transfer control unit to bring a transfer-sheet conveying belt and an intermediate transfer belt into contact with each other so as to transfer an alignment control pattern formed on the transfer-sheet conveying belt onto the intermediate transfer belt, whereby alignment for colors C and K is performed on the intermediate transfer belt, and furthermore a second alignment control unit causes the secondary transfer control unit to separate the transfer-sheet conveying belt and the intermediate transfer belt from each other so as to perform alignment for colors Y, M, and C, whereby alignment is performed for all the colors.12-02-2010
20100322679Image forming apparaus, and method and computer program product for image forming - An image forming apparatus includes an encoder that detects a first pulse signal relevant to a conveyance velocity of an intermediate transfer belt, an encoder that detects a second pulse signal relevant to a conveyance velocity of a transfer-paper conveying belt, a print control unit that performs feedback control by using a count value of the first pulse signal per unit time and a target conveyance velocity value common between the conveyance velocity of the intermediate transfer belt and that of the transfer-paper conveying belt so that the conveyance velocity of the intermediate transfer belt attains the target value and also performs feedback-control by using a count value of the second pulse signal per unit time and the target value so that the conveyance velocity of the transfer-paper conveying belt attains the target value.12-23-2010
20090067893IMAGE SHIFT ADJUSTING APPARATUS OF IMAGE FORMING APPARATUS - First patterns for setting a first adjustment value and second patterns for setting a second adjustment value are formed on a transfer belt running at a first process speed. By this, an image shift adjustment value in a sub-scanning direction is made common to the first process speed and a second process speed. Image shift adjustment values in a main scanning direction are set for the first process speed and the second process speed, respectively.03-12-2009
20110085828IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND COMPUTER PROGRAM PRODUCT - An image forming apparatus includes: a transfer-sheet conveying member that rotates to convey a transfer sheet; a first image forming unit that directly transfers a color image onto the transfer sheet; an intermediate transfer member that rotates while an image is transferred thereon; a second image forming unit that transfers images onto the intermediate transfer member; a secondary transfer unit that transfers the images on the intermediate transfer member onto the transfer sheet; a measuring unit that measures a surface velocity of the transfer-sheet conveying member and the intermediate transfer member; and a control unit that performs phase matching control by accelerating or decelerating the transfer-sheet conveying member or the intermediate transfer member so as to match a phase of fluctuation of the measured surface velocity of the transfer-sheet conveying member and a phase of fluctuation of the measured surface velocity of the intermediate transfer member.04-14-2011
20100239331POSITION ERROR CORRECTING METHOD, POSITION ERROR CORRECTING APPARATUS, AND IMAGE FORMING APPARATUS INCLUDING THE POSITION ERROR CORRECTING APPARATUS - A position error correcting method includes forming an image-forming condition determination pattern on an endless transport unit transported in a first direction, the image-forming condition determination pattern including plural unit patterns having different unit-area attached toner amounts and arranged in the first direction; detecting a detection limit pattern having the minimum detectable unit-area attached toner amount from the unit patterns; calculating an image-forming condition of the detection limit pattern; forming a position error correction pattern on the endless transport unit in the first direction in accordance with the image-forming condition; and correcting a position error of a toner image formed on the endless transport unit by plural image forming units, using the position error correction pattern, wherein the position error is corrected with respect to a second direction perpendicular to the first direction.09-23-2010
20100226696IMAGE FORMING APPARATUS - The image forming apparatus includes a plurality of photosensitive members, a plurality of exposure portions to perform exposure on the plurality of photosensitive members, a development portion to form a toner image at the plurality of photosensitive members, a transfer medium to which the respective toner images formed on the plurality of photosensitive members are sequentially transferred so as to form an image, and a position correction portion to perform position correction by moving at least one photosensitive member among the plurality of photosensitive members, and the position correction of the photosensitive member is performed by swinging the photosensitive member by the position correction portion having a line on a circumference surface of the photosensitive member corresponding to an exposure position of the exposure portion as the center axis.09-09-2010
20110085827IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - This invention provides an image forming apparatus capable of effectively suppressing an AC color registration error, and a control method thereof. To accomplish this, the image forming apparatus according to this invention controls driving of a transfer belt so that the speed of surface of the transfer belt at the transfer position comes close to a constant speed. The image forming apparatus also controls driving of a photosensitive drum so that the error between the speed of surface of the photosensitive drum and that of the transfer belt at the transfer position becomes almost 0. Further, the image forming apparatus controls the exposure timing in accordance with fluctuations of the speed of surface at the exposure position so that the exposure interval in the sub-scanning direction on the photosensitive drum comes close to a constant interval.04-14-2011
20110255908IMAGE FORMING APPARATUS - An image forming apparatus includes a pattern forming unit which forms a light amount adjustment pattern on an image carrier belt, a light amount control unit which controls the amount of light irradiating the image carrier belt and pattern, a detection sensor which detects reflected light amounts from the image carrier belt and pattern with respect to the irradiating light amount and stores the detection results in a storage unit, a calculation unit which calculates the correspondence between the irradiating light amount and the reflected light amounts from the image carrier belt and pattern on the basis of the detection results and stores the calculation results in the storage unit, and a light amount decision unit which decides, on the basis of the calculation results, a light amount at which the difference between the reflected light amounts from the image carrier belt and pattern exhibits a value set in advance.10-20-2011
20090317149IMAGE FORMING APPARATUS - An image forming apparatus includes a control unit configured to cause an image forming unit to form an adjustment image on an image bearing member, and a detection unit configured to detect the adjustment image, wherein the control unit controls gradation for forming an image by the image forming unit based on a detection result provided by the detection unit, and wherein, when causing the image forming unit to form a first adjustment image on the image bearing member at a photosensitive member and to subsequently form a second adjustment image that is different from the first adjustment image, the control unit causes the image forming unit to form the second adjustment image at a position different from a position for forming the first adjustment image in a longitudinal direction of the photosensitive member.12-24-2009
20090317148IMAGE FORMING APPARATUS AND METHOD FOR CONTROLLING SAME - In full-color printing, one of first and second rotary members is activated with a time lag after the other of the first and second rotary members is activated such that the phase difference between the first and second rotary members is an adjusted phase difference. In addition, every time monochrome printing is performed, the time lag is changed.12-24-2009
20090317147SHEET COLOR IMAGE FORMING APPARATUS - A color image forming apparatus for forming toner images by carrying out charging, exposure, and development on at least one photoreceptor drum, and forming color images by transferring the toner images onto sheets, the color image forming apparatus including: a photoreceptor drum which rotates around an axis; an exposure section which intermittently emits a light beam onto the cylindrical surface of the rotating photoreceptor drum along scanning lines parallel to the axis of the photoreceptor drum; a calculation section which calculates a printing ratio of a color image to be formed on one sheet, wherein the printing ratio is the ratio of the area covered by toner in the color image; and a timing control section which controls a timing when the exposure section emits the light beam in a direction of rotation of the photoreceptor drum based on the printing ratio calculated by the calculation section.12-24-2009
20080292370Image Forming Apparatus - A light receiving portion is configured to receive a light that varies with time while a mark formed on an object moves across a detection area. The position of the mark on the object is determined based on comparison of a time-varying level of said light with at least one threshold during movement of said mark on said object across said detection area. The determined position of the mark is corrected by a correction value into a corrected mark position. The correction value is set to a higher value, if the time-varying light level exceeds the threshold or falls below the threshold with a smaller slope while the mark moves across the detection area. An image forming position is adjusted based on the corrected mark position.11-27-2008
20080292368System and method for determining and correcting color separation registration errors in a multi-color printing system - A system and method for determining a color separation registration error in a multi-color printing system are provided. The system and method provide for instructing first and second color separations to mark a substrate with first and second fine-periodic-patch images to determine color separation registration error(s). The system and method further provide for determining whether at least an about half-period color separation registration error exists between the first and second color separations.11-27-2008
20110026982Image Forming Apparatus - An image forming apparatus is provided. The apparatus includes an exposure section configured to form an electrostatic latent image, a developing section configured to supply developer to the electrostatic latent image to form a developer image, a first carrier configured to rotate while carrying thereon the developer image formed by the developing section, a second carrier configured to interpose a recording medium with the first carrier and configured to indirectly carry the developer image transferred from the first carrier to the recording medium, and a correction section configured to correct a formation position of the electrostatic latent image with using a correction value which is based on a use level of developer corresponding to at least one of an amount of developer and a coverage of developer in the developer image.02-03-2011
20110026981IMAGE FORMING APPARATUS FOR OBTAINING MULTIPLE IMAGE BY ADJUSTING PLURAL IMAGES - An image forming apparatus includes a running member including an image formation area, plural image forming sections to form a density adjustment pattern respectively on a straight line perpendicular to a running direction of the running member at a time of density adjustment, plural density detection sections to simultaneously detect the density adjustment patterns on the straight line respectively and simultaneously, and a density correction section to correct image densities of the plural image forming sections respectively based on detection results of the density adjustment patterns obtained by the plural density detection sections.02-03-2011
20110026980IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming method comprising: 02-03-2011
20120148315IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING THE SAME - An image forming apparatus of this invention transfers pattern images for color deviation detection of the respective colors for color deviation detection on an endless belt for the formation of images, and corrects color deviation occurring when each image forming unit forms an image on a recording material, in accordance with the amount of color deviation detected by a registration detection sensor. The image forming apparatus forms pattern images of the respective colors on the endless belt at the intervals determined based on the total variation obtained by totalizing each variation of the transfer and detection positions of a pattern image of each color on the endless belt from an ideal position. This enables to reduce color deviation detection errors by using pattern images for color deviation detection and improve the accuracy of color deviation correction.06-14-2012
20110052275IMAGE FORMING APPARATUS - The image forming apparatus detects color deviation amount in a timing when a developing roller separates from or contacts a photosensitive drum to set a difference in peripheral velocities between the photosensitive drum and an intermediate transfer belt or a transfer material conveying belt based on the color deviation amount and information about the use degree of intermediate transfer belt.03-03-2011
20110097119Image forming apparatus and control method thereof - To restrict a period velocity change of a photoconductor that is an immediate cause of a color registration error, a gap change of a color registration error detection pattern caused by a linear velocity change of the photoconductor is acquired and a linear velocity change of the photoconductor is reduced based on a relationship between the gap change and a velocity of a motor, whereby a reduced color registration error is accomplished.04-28-2011
20110097118ADVANCED PRINTING SYSTEM EMPLOYING NON-CONVENTIONAL TONERS AND GANGED PRINTERS - A system and method using an electrographic printer for printing of a print including an image and a particular pattern using techniques that also allows the selective application of non-conventional toners to an image formed on a printed media using registration marks to locate the original image on the printed media in order to provide proper alignment of the non-conventional toner image to the original printed image. The system employs two printers, the first is a conventional EP printer with the capability (internal or via driver software) to place registration marks on the print media along with the printed image, and a second printer adapted to read the registration marks on the printed media. Once the registration marks are read the non-conventional toner image is applied by the second printer in relative relation the positions of the read registration marks.04-28-2011
20110176843IMAGING FORMING APPARATUS AND METHOD OF CONTROLLING SAME - An image forming apparatus has a function for adjusting the position at which a toner image is formed on a printing material, based upon amount of light reflected from a toner image that has been formed on an image carrier. The light-emitting unit emits light that irradiates the image carrier, and the detecting unit detects an amount of substrate-light reflected from the substrate of the image carrier. The determining unit determines whether the difference between the amount of substrate-light detected at a first point in time and the amount of substrate-light detected at a second point in time later than the first point in time is greater than a predetermined threshold value. The light-power control unit increases the amount of light in the light-emitting unit if the difference is greater than the predetermined threshold value.07-21-2011
20100028058Apparatus to control color registration and image density - An apparatus to control color registration and image density and a method of calculating a color registration error. The apparatus includes registration marks formed on a transfer belt such that each of the registration marks includes a scan direction component and a slanting direction component at an angle with respect to both the scan direction and the cross-scan direction. The apparatus further includes image density marks formed on the transfer belt, having predetermined image densities, and a registration and image density sensor provided above the registration marks and the image density marks to radiate beams onto the registration marks and the image density marks. The sensor receives beams reflected from the registration marks and the image density marks to produce detection signals, and obtains registration information and image density information from the detection signals. Accordingly, X-offset, Y-offset, printing width error, and skew can be simultaneously compensated for using a single apparatus.02-04-2010
20110217089IMAGE FORMING APPARATUS AND COMPUTER READABLE MEDIUM - An image forming apparatus includes a first acquiring unit, a determination unit, a second acquiring unit, and a notifying unit. The first acquiring unit acquires first settable region information on a plane-shaped recording medium in other image forming apparatus. The first settable region information indicates a first settable region on which a registration mark is settable. The determination unit determines a first region based on the first settable region information. The first region is a region on which the registration mark is formable in a cascade printing system including the image forming apparatus and the other image forming apparatus. The second acquiring unit acquires second settable region information on the plane-shaped recording medium. The second settable region information indicates a second settable region on which the registration mark is formable in the plane-shaped recording medium. The notifying unit provides invalidity information indicating the registration mark is possible invalid.09-08-2011
20130142549IMAGE FORMING APPARATUS - The image forming apparatus includes a plurality of image forming devices that includes a developing device and a transferring device, an exposure unit irradiating the image bearing member with a laser beam, a detector detecting a toner image for detection, and a CPU for detecting and correcting the positional deviation of each color, wherein the CPU forms the toner image for detection on a color-by-color basis between pages in a print job including plural pages of images, and corrects times Trv and Tv from timing on which a subscanning image-writing timing synchronizing signal is output to timing on which a laser unit emits a laser beam based on times Ty to Tk between timing on which the subscanning image-writing timing synchronizing signal is output and timing on which the color misregistration detection sensor detects the misregistration detection pattern.06-06-2013
20120114396IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus which includes comprises: a detection unit configured to detect a position where a toner image of a color component other than the color component of the misregistration prevention pattern and the toner image of the misregistration prevention pattern overlap each other on a surface of an image carrier; and a control unit configured to control to form the misregistration prevention pattern on the surface of the image carrier except for the overlapping position detected by the detection unit, and not to form the misregistration prevention pattern at the overlapping position on the surface of the image carrier.05-10-2012
20120045256IMAGE FORMING APPARATUS THAT EMPLOYS ELECTROPHOTOGRAPHIC METHOD - The formation position of a primary-transferred toner image is corrected by using, as a reference, a timing at which a marker that rotates together with a rotating member is detected by a marker detecting unit for detecting the marker, after part of a preparation operation in which a processing unit is caused to contact or depart from the rotating member is finished.02-23-2012
20120003016COLOR IMAGE FORMING APPARATUS - The image forming apparatus includes process units that are closely arranged around respective photosensitive members and act on the photosensitive members, a light emission section that forms an electrostatic latent image for detection on the photosensitive member and a detection section that detects the electrostatic latent image passes through a position facing to the process unit and a control section that performs misregistration correction control based on the detection result. It achieves to resolve a problem that is caused in detection of a conventional toner image for detection by an optical sensor and to enhance usability of an image forming apparatus.01-05-2012
20120008995IMAGE FORMING APPARATUS - An image forming apparatus includes a first drum; first code forming means for forming a first electrostatic image code outside a developing zone for a toner image; a second drum; second code forming means for forming a second electrostatic image code outside the developing zone for the toner image; a transfer belt provided with an electrostatic image recording track capable of holding the first electrostatic image code transferred from the first drum to the second drum; transferring means for applying a voltage to a side of the transfer belt which is opposite a side contactable to the first drum to transfer the first electrostatic image code onto the electrostatic image recording track; detecting means including an electroconductive member provided which is parallel with the electrostatic image code and which is spaced from a surface of the electrostatic image code of the electrostatic image recording track to be detected with a predetermined gap, and a detecting portion for detecting an induced current generated in the electroconductive member with relative movement relative to the lines of the electrostatic image code, the detecting means detecting the first electrostatic image code of the electrostatic image recording track and the second electrostatic image code of the second drum at a position of the second drum; and control means for controlling image formation on the first drum or the second drum on the basis of a detection result of the detecting means such that the toner image on the second drum is transferred onto a recording material on the transfer belt and overlaid on the toner image transferred onto the recording material from the first drum.01-12-2012
20120008994COLOR IMAGE FORMING APPARATUS - A color image forming apparatus including a test pattern formation portion that forms test patterns of a plurality of colors in an image formation area in which images of the plurality of colors are formed on an image carrier and in an image non-formation area outside the image formation area on the image carrier, a detection portion that detects a shift of each of the test patterns of the plurality of colors formed in the image formation area and a shift of each of the test patterns of the plurality of colors formed in the image non-formation area, a computing portion that obtains, for each color, an offset value indicating an offset between the shift of the test pattern in the image non-formation area and the shift of the test pattern in the image formation area, and a storage portion that stores the offset value for each color.01-12-2012
20120008993IMAGE FORMATION DEVICE AND IMAGE CORRECTION METHOD - An image formation device comprises imaging units creating toner images in a corresponding color; an intermediate transfer body where the toner images are overlaid in a primary transfer; a secondary transfer unit performing secondary transfers of the overlaid toner images onto a recording sheet; a first misregistration correction unit operable to cause each imaging unit to form a reference pattern, execute a first misalignment reading acquisition process of acquiring a misalignment reading for each pattern, and adjust the imaging units to correct the readings; a storage unit storing the readings; and a second misregistration correction unit operable to cause an imaging unit subset to form reference patterns, execute a second misalignment reading acquisition process of acquiring readings for the subset of patterns and estimating readings in colors for which no pattern is formed from the acquired readings and the stored readings, and adjust the imaging units to correct all readings.01-12-2012
20100067961USE OF REGISTRATION MARKS TO IMPROVE IMAGE ON PAPER REGISTRATION PERFORMANCE - A method for improving image on paper registration in an image printing system is provided. The method includes advancing a target media along a media path; printing a plurality of registration marks adjacent to a toner image on an image bearing surface moving in a process direction, wherein the toner image is configured to be transferred to the target media; detecting positions of the registration marks using one or more sensors adjacent the image bearing surface; determining a correction function using the positions of the registration marks to compensate for an error in a registration of the toner image and the target media; adjusting the advancement of the target media based on the correction function; and transferring the toner image to the target media.03-18-2010
20120207518COLOR-TO-COLOR REGISTRATION FOR BELT PRINTING SYSTEM - Embodiments described herein include a multi-color printing system in which color-to-color registration errors due to cyclical belt motion errors are minimized. A belt for transporting a substrate media or at least a partial image into a plurality of panels is segmented. A first one of the panels has a first location on the belt for receiving substrate media or a partial image. A first belt motion error value corresponding to the first one of the panels on the belt is identified and at least one image marking unit is calibrated to counteract the first belt motion error corresponding to the first one of the panels.08-16-2012
20120163880METHOD FOR CONTROLLING IMAGE FORMING APPARATUS, AND IMAGE FORMING APPARATUS - If any of a plurality of conditions is satisfied, an image forming apparatus having a plurality of image forming units that form images on an intermediate transfer member in a superimposed manner detects, using a pattern detection sensor, the amount of color misregistration of the images formed by the plurality of image forming units on the intermediate transfer member and corrects the color misregistration of the images formed by the plurality of image forming units in accordance with the amount of color misregistration that is smaller than a color misregistration correction tolerance, which varies depending on the plurality of conditions, and that has been detected by the pattern detection sensor.06-28-2012
20110182629IMAGE FORMING APPARATUS AND COLOR MATCHING METHOD - According to one embodiment, an image forming apparatus includes: plural photoconductive members, a sensor, a measuring unit, a first calculating unit, a determining unit, and an adjusting unit. The sensor detects specific places of predetermined images of two colors respectively formed by two photoconductive members among the plural photoconductive members. The measuring unit measures the length between the specific places of the predetermined images detected by the sensor. The first calculating unit calculates, on the basis of the length between the specific places measured by the measuring unit, a shift amount of toner images formed by the two photoconductive members. The determining unit determines whether the shift amount calculated by the first calculating unit is within a specified range. The adjusting unit adjusts, if the determining unit determines that the shift amount is outside the specified range, shifts of toner images respectively formed by the plural photoconductive members using one of two colors as a reference color.07-28-2011
20090060599IMAGE FORMING APPARATUS HAVING A MECHANISM FOR DETECTING A MARK ON A BELT - A circumferential length of a belt is measured within a short period of time. A plurality of marks is provided on a belt. Distances between the marks are set to be all different from each other. The distance between the marks is set to allow the mark to be identified by measuring a period of time between the detection of one mark and that of the next mark even if the length of the belt is changed to some degree by the expansion of the belt or the like. Then, a period of time between the identified mark and the next mark is accurately measured. The total circumferential length of the belt is measured based on the results of measurement.03-05-2009
20120224891IMAGE FORMING APPARATUS AND METHOD FOR COLOR REGISTRATION CORRECTION - A color registration method includes determining whether color registration is needed or not, if color registration is needed, setting an optimal amount of light of the registration sensor in a feedback manner, forming a predetermined mark for color registration correction on an image forming medium, and performing color registration correction with respect to the formed mark using the set optimal amount of light.09-06-2012
20120321356IMAGE FORMING APPARATUS - An image forming apparatus includes a patch forming unit configured to form a patch group containing patch subgroups arranged in a sub-scanning direction. Each of the patch subgroups contains a reference color patch and a color patch of a different color. The reference color patches are shifted from each other in a main-scanning direction. The color patches are shifted from each other in the main-scanning direction. The patch subgroups include reference patch subgroups in each of which the reference color patch covers over the color patch and detection patch subgroups in each of which at least part of the color patch does not overlap with the reference color patch. Center positions of non-overlapping portions of the color patches that do not overlap with the reference color patches in the main-scanning direction are located at substantially a same position in the patch group.12-20-2012
20130022377IMAGE FORMING APPARATUS THAT CARRIES OUT COLOR REGISTRATION ADJUSTMENT, CONTROL METHOD THEREFOR, AND STORAGE MEDIUM - An image forming apparatus which is capable of improving the accuracy of detecting the amount of misregistration. A control unit controls a plurality of image forming units so as to form a color registration pattern on a image bearing member. A detection unit detects diffusely reflected light reflected on the image bearing member and the color registration pattern. The control unit compares a first output value output by the detection unit detecting the surface of the image bearing member with a second output value output by the detection unit detecting a low-reflectivity toner pattern formed on the image bearing member, and determines a density of the color registration pattern corresponding to the low-reflectivity toner pattern based on a result of the comparison.01-24-2013
20130022378IMAGE FORMING APPARATUS - Disclosed herein is an image forming apparatus including a main body provided with an opening, a cover to open and close the opening, a plurality of development units developing electrostatic latent images into visible images through developers, a transfer device including an intermediate transfer belt receiving the developers from the plurality of development units and transferring the developers to printing media, and a sensor unit provided with light windows located at first positions opposite the intermediate transfer belt when the opening is closed by the cover, and located at second positions exposed to the opening when the opening is opened by the cover. Thereby, a user may clean the light windows through the opening.01-24-2013
20080226361Image forming apparatus with image adjusting function, image adjusting method and image adjusting program - An image forming apparatus with an image adjusting function using a adjustment patterns transferred on an endless belt including; a calculation unit that obtains, based on the measured positions of the adjustment patterns, a deviation in a rotating direction and/or in a width direction, respectively; and an adjustment unit that adjusts an image to be formed based on each obtained deviation, the adjustment patterns including a first oblique pattern obliquely intersecting with one straight line extending in the width direction of the endless belt in a right front direction and a second oblique pattern obliquely intersecting with the line in a left front direction, the calculation unit obtaining the deviation in the rotating direction from an average of the deviations of the first and second oblique pattern in the rotating direction and obtaining the deviations of the first and second oblique pattern in the width direction, respectively.09-18-2008
20080226360IMAGE FORMING APPARATUS AND METHOD FOR CONTROLLING THE SAME - An image of a color misregistration detection pattern is formed, and the amount of color misregistration is detected by reading of the pattern image. The amount of color misregistration detected by a detecting unit and the delay time from the time when image data is requested to the time when the image data is output are stored. The color misregistration is corrected based on the stored delay time and amount of color misregistration.09-18-2008
20080226359Image-Forming Device - The pattern data generating unit generates pattern data indicative of a pattern of a plurality of marks including a plurality of first marks each having a first color and a plurality of second marks each having a second color so that a first target-total is equal to a second target-total. The first target-total is a total of deviations of first target-positions from a reference position in a predetermined direction. The second target-total is a total of deviations of second target-positions from the reference position in the predetermined direction. The controlling unit controls the image-forming unit to calibrate the second target-positions based on the offset of a second actual-total from a first actual-total.09-18-2008
20130129394IMAGE FORMING APPARATUS INCLUDING TRANSFER BELT - An image forming apparatus includes: a belt position detection unit configured to detect a position of a transfer belt in a rotating shaft direction of a driving roller; a roller driving unit configured to tilt a steering roller to control the position of the transfer belt in the rotating shaft direction of the driving roller; a storage unit configured to store data about a reference position of a steering roller; and a control unit configured to acquire data about a tilt amount of the steering roller with respect to the reference position and control, in the rotating shaft direction of the driving roller based on the data about the tilt amount, a formation position of a toner image formed on each of the plurality of image carriers by the image forming unit.05-23-2013
20130149014IMAGE FORMING APPARATUS AND COLOR REGISTRATION METHOD OF THE SAME - An image forming apparatus which obtains rotational variance factors of an intermediate transfer belt for each of plurality of colors based on locations with respect to second pattern image being obtained by a location calculation unit, corrects the location obtained with respect to a first pattern image based on the rotational variance factor obtained with respect to the color of the first pattern image, obtains an offset of another color with respect to a reference color based on the location after correction, and performs color registration based on the obtained offset to reduce the offset.06-13-2013
20130149015MULTI PASS TYPE COLOR IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - A multi pass type color image forming apparatus and control metod are provided. The apparatus advances an exposure time point of forming electrostatic latent images of second and subsequent colors more than that of a first color of a page during consecutive printing or reduces the velocity of a motor to rotate an intermediate transfer belt to minimize a color registration error between a developing agent image of the first color and developing agent images of the subsequent colors of the page caused by cleaning of the intermediate transfer belt and a control method thereof.06-13-2013
20100310282PRINTING METHOD, APPARATUS AND SYSTEMS FOR GENERATING A REG SYNC SIGNAL - This disclosure provides a method, apparatus, and system for registering the transfer of an image from a belt to a media substrate associated with a printing device. Specifically, the exemplary methods use a ROS master clock and belt location sensor located downstream of a belt tensioning device to generate a reg sync signal to initiate transfer of the image.12-09-2010
20130156472IMAGE FORMING APPARATUS - An image forming apparatus includes a plurality of image forming means; transferring means for superimposingly transferring the developed images; a detector for detecting light reflected by the developed image; a position detector for detecting a position of the developed image; memory for storing for each color of the developer, information relating to a correction amount for correcting an error between a position obtained by the position detector and an actual position, a corrector for correcting the position of the developed image formed on the image bearing member by the image forming means, on the basis of positions of the developed images of the respective color detected by the position detector and information relating to the correction amount stored in the memory.06-20-2013
20110318065APPARATUS AND METHOD OF COLOR SHIFT CORRECTION, AND MEDIUM STORING COLOR SHIFT CORRECTION PROGRAM - An apparatus forms a plurality of patterns using a plurality of colors as a second pattern, and a plurality of patterns using one of the plurality of colors as a second pattern. The apparatus obtains a first detection result indicating the pitch of each one of the plurality of patterns of the first pattern, and a second detection result indicating the pitch of each one of the plurality of patterns of the second pattern. The apparatus calculates a difference between the first detection result and the second detection result to obtain a difference value, and calculates a correction value using the second detection result and the difference value. The correction value is used to control an image forming apparatus to suppress color shifts in the images.12-29-2011
20130195518IMAGE FORMING APPARATUS WHICH USES ELECTROSTATIC LATENT IMAGE FOR COLOR MISREGISTRATION CORRECTION - An image forming apparatus includes a control unit configured to form electrostatic latent images for correction on a photosensitive member; a voltage application unit configured to apply a voltage to a process unit; a current detection unit configured to detect a current to the voltage application unit via the process unit when the voltage is applied to the process unit; and a conversion unit configured to convert an output value detected by the current detection unit such that a variation range of the output value detected by the current detection unit at a formation period of the electrostatic latent image for correction becomes larger than a variation range of the output value detected by the current detection unit at a one-rotation period of the photosensitive member on which the electrostatic latent image is not formed.08-01-2013

Patent applications in class Registration