Patent application number | Description | Published |
20100208306 | IMAGE READING APPARATUS, IMAGE FORMING APPARATUS, AND IMAGE PROCESSING APPARATUS - In one embodiment, image reading apparatuses | 08-19-2010 |
20100316396 | IMAGE FORMING APPARATUS - In one embodiment, the present invention provides an image forming apparatus that forms a plurality of images using a plurality of image carriers respectively corresponding to the images and stacks those images, the apparatus having a first group to which at least one image carrier among the plurality of image carriers belongs, a second group to which at least one image carrier among the remaining image carriers belongs, and a single detection sensor that detects a first detection information for identifying a rotation timing of the first group image carrier and also detects a second detection information for identifying a rotation timing of the second group image carrier. | 12-16-2010 |
20110026953 | Image forming apparatus and method for calibrating toner image detection sensor - According to an embodiment of the present invention, an image forming apparatus includes a toner image carrier that carries a toner image, a toner image detection sensor that detects a reference toner image on the toner image carrier, a temperature sensor that detects a temperature in the apparatus, and storage section for storing a correlation between each temperature and a drive value for the toner image detection sensor, in which calibration of the toner image detection sensor is performed by acquiring a corresponding drive value from the storage section based on the temperature measured by the temperature sensor and driving the toner image detection sensor at the acquired drive value. | 02-03-2011 |
20110170886 | IMAGE FORMING APPARATUS - In an image forming apparatus, a computing unit computes phase shift amounts A(i) for every correction relative phase angle θ(j) based on an amplitude B of a reference compressional wave αa, an amplitude C(i) of a detection compressional wave α(i), and a relative phase angle φ(i). A setting unit specifies the phase shift amounts A(i), and sets a correction relative phase angle θ(j) corresponding to the specified phase shift amounts A(i). A correction unit corrects, based on the correction relative phase angle θ(j) set by the setting unit, a relative phase shift between a periodic variation in the circumferential speed of a first image bearing member and a periodic variation in the circumferential speed of a second group image bearing member by operationally controlling at least one of first and second drive units. | 07-14-2011 |
20110274463 | IMAGE FORMING APPARATUS - An image forming apparatus provided with a resin frame made of a resin, an image forming unit and a fixing unit includes a duct for allowing air to flow between the image forming unit and the fixing unit. The resin frame includes a main frame to which the image forming unit is attached, and a fixing unit attachment frame that is separate from the main frame and to which the fixing unit is attached, and the fixing unit attachment frame has a duct portion that constitutes at least one part of the duct. | 11-10-2011 |
20110280609 | IMAGE FORMING APPARATUS - In one embodiment, an image forming apparatus ( | 11-17-2011 |
20110280614 | IMAGE FORMING APPARATUS WITH RESIN FRAME AND METHOD FOR MOLDING THE RESIN FRAME - An image forming apparatus of the present invention includes a resin frame composed of a resin and an image forming unit that is removably inserted in the resin frame. The resin frame includes a base having a supporting surface that supports the image forming unit, a guide portion that extends in the base in an insertion direction in which the image forming unit is inserted along the supporting surface and that guides the image forming unit in the insertion direction while limiting movement of the image forming unit in an orthogonal direction that is orthogonal to the insertion direction, and a side plate portion that is provided at a peripheral edge of the base so as to extend in a direction perpendicular to the supporting surface, the base, the guide portion, and the side plate portion being integrally molded from a resin. A mold opening direction of a mold for molding the guide portion is set to a direction parallel to the orthogonal direction, and downstream end portions of the side plate portion in the mold opening direction are integrally connected to each other and extend essentially parallel to the perimeter of the base. | 11-17-2011 |
20120008994 | COLOR 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 |
20120275802 | IMAGE FORMING APPARATUS - The image forming apparatus includes: a paper feed unit; a print unit; a registration roller; a sheet leading end sensor provided downstream, in a transport direction of the recording paper, of the registration roller; a time measuring unit for measuring a time from a start point of transportation of the recording paper by the registration roller to a point of detection of the leading end of the recording paper by the sheet leading end sensor; a memory unit for storing a reference image forming time and a reference time; a print control unit; and an arithmetic unit for obtaining a difference between the reference time and the time detected by the time measuring unit. The print control unit adjusts the length of the image forming period in accordance with the adjusted image forming time determined based on the difference obtained by the arithmetic unit and the reference image forming time. | 11-01-2012 |
20130016169 | REGISTRATION ADJUSTMENT METHOD FOR IMAGE FORMING APPARATUS AND IMAGE FORMING APPARATUSAANM OHTOSHI; TakenoriAACI OsakaAACO JPAAGP OHTOSHI; Takenori Osaka JPAANM TOMITA; NorioAACI OsakaAACO JPAAGP TOMITA; Norio Osaka JPAANM SASOH; KiyoshiAACI OsakaAACO JPAAGP SASOH; Kiyoshi Osaka JPAANM KUMAGAI; YujiAACI OsakaAACO JPAAGP KUMAGAI; Yuji Osaka JP - In a registration step, the temperature near a polygon mirror ( | 01-17-2013 |
20130039680 | COLOR 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 |
Patent application number | Description | Published |
20080220347 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An LD switch is turned ON to output image data outputted from an image processing section to a laser diode, and to irradiate a laser light to a photosensitive drum. The number of pixel dots included in the image data outputted from the image processing section is computed by line basis to detect an image density based on the total sum of the pixel dots of each color at a timing when the image data of Nth line is outputted from the image processing section. The detected image density is compared with a threshold value to turn OFF the LD switch at a timing when the image data of (N+α)th line is outputted when the image density is greater than the threshold value. This suppresses a variation in a rear-end-void length due to sheet slippage. | 09-11-2008 |
20080226361 | Image 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 |
20090080914 | IMAGE PROCESSING APPARATUS AND IMAGE FORMING APPARATUS - A sub CPU of an image forming section forms a toner image based on test line data on an intermediate transfer belt, detects an inclination of the formed toner image for each color component, calculates an adjustment indicative value for correcting the detected inclination for each color component, and outputs the adjustment indicative values to the BK adjusting section, C adjusting section, M adjusting section, and Y adjusting section, respectively, of an inclination adjusting section. The BK adjusting section, C adjusting section, M adjusting section, and Y adjusting section generate, based on the respective adjustment indicative values obtained from the sub CPU, adjustment amounts for an inclination adjustment process to be executed on image data, execute the inclination adjustment process based on the generated adjustment amounts, and output the obtained image data to the respective LDs of an exposure unit. | 03-26-2009 |
20090123181 | IMAGE FORMING APPARATUS - There is provided an image forming apparatus that includes couplings for photoreceptor drums, couplings for waste toner transporting screws, and couplings for developing rollers, that transmit driving force to each of a plurality of driving shafts for driving a process portion that performs image formation by an electrophotographic method, and a plurality of coupling attaching/detaching members for attaching/detaching the plurality of coupling members, so as to drive the process portion. In the image forming apparatus, the plurality of coupling attaching/detaching members are provided so as to be movable independently, and the image forming apparatus includes a coupling attaching/detaching member driving mechanism that operates the coupling attaching/detaching members in association with each other. | 05-14-2009 |
20090255359 | ROTATIONAL DRIVE TRANSMISSION MECHANISM AND IMAGE FORMING APPARATUS USING THE SAME - A rotational drive transmission mechanism used in an image forming apparatus for transmitting rotational drive force using an internal gear and an external gear having involute tooth profiles, includes photoreceptor drum drive couplings for transmitting rotational drive force to photoreceptor drums and a transfer drive coupling for transmitting rotational drive force to an intermediate transfer belt drive roller. The internal gears provided for these are so formed that all the drive vectors of the rotational drive force transmitted to the teeth of either the internal gear or the external gear in mesh with the internal gear, are made uniform so as to be oriented either outwards from the center of the rotational axis or inwards toward the center of the rotational axis, equivalently relative to the center of the rotational axis. | 10-15-2009 |
Patent application number | Description | Published |
20080298841 | PHOTOSENSITIVE-MEMBER DRIVING MECHANISM - It is an object to prevent distortions and deviations of images caused by the eccentricity of a driven gear mounted to a rotational shaft of a photosensitive drum. There are provided a driving gear which is secured to a rotational shaft of a rotational driving power source and is rotated at a constant peripheral speed, a driven gear secured coaxially to a rotational shaft of a cylindrical-shaped photosensitive member, a phase control gear having the same diameter as that of the driven gear and having the same rotational speed variation characteristic as that of the driven gear, and a transmission gear, and a driving force from the driving gear is transmitted to the driven gear through the phase control gear and the transmission gear. | 12-04-2008 |
20090154945 | IMAGE FORMING APPARATUS - In an embodiment of the present invention, an image forming apparatus includes a transfer belt that primarily transfers a toner image formed on a photosensitive drum; a secondary transfer unit including a transfer mechanism portion that secondarily transfers the primarily transferred toner image to a paper; an optical sensor that detects a reference toner image on the transfer belt; and a shutter that protects a detection face of the optical sensor, wherein a separation/contact mechanism portion disposed so as to be brought into contact with both of the shutter and the secondary transfer unit is provided, and the separation/contact mechanism portion allows the shutter to move so as to open and allows the secondary transfer unit to move so as to separate from the transfer belt when the reference toner image is detected by the optical sensor, and allows the shutter to move so as to separate from the transfer belt when the secondary transfer unit is drawn out from an apparatus main body. | 06-18-2009 |
20090252540 | IMAGE 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 |