Patent application number | Description | Published |
20090141296 | COLOR IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING THE SAME - A color image forming apparatus in which a positional displacement detection image and a light quantity adjustment image are formed within a one-rotation length of an image bearing member (intermediate transfer belt). A light-emission quantity when detecting density is determined on the basis of a detection result of a light quantity adjustment image formed within the one-rotation length using light-emission quantity that is provided when light is emitted to the positional displacement detection image. This allows, for example, image density control to be performed quickly while precision of the image density control is maintained. | 06-04-2009 |
20090269095 | IMAGE FORMING APPARATUS - The speed at which transfer-material enters a transfer region is controlled to prevent a phenomenon in which a toner image on an intermediate transfer belt is scraped by the leading edge of the transfer-material when the toner image is transferred onto the transfer-material. While the conveying speed of the transfer-material in a transfer nip coincides with the speed of the intermediate transfer belt, the transfer-material is conveyed at a speed lower than the peripheral speed of the intermediate transfer belt when the leading edge of the transfer-material comes into contact with the intermediate transfer belt, and the conveying speed of the transfer-material is increased by the time when the transfer-material enters the transfer nip. | 10-29-2009 |
20090296147 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - There is provided an image forming apparatus which shortens the time taken for circumference detection and measures the circumference at high precision without obstructing downsizing of the apparatus. To accomplish this, the image forming apparatus detects, at an arbitrary timing, the physical pattern of the image-formed surface of a rotation member that changes over time. In the second round, the image forming apparatus detects the second pattern at a timing a predetermined time after the arbitrary timing. By using the detected patterns, the image forming apparatus obtains information associated with the circumference of the rotation member. | 12-03-2009 |
20090297182 | IMAGE FORMING APPARATUS - An image forming apparatus which predicts VL fluctuations of a photosensitive drum in consideration of a double-sided print mode, and performs an image formation control based on the prediction, and thus always obtains a stable density image. The image forming apparatus performs an appropriate image formation control by controlling an image forming condition based on a photosensitive member rotation time, a photosensitive member stop time, a temperature of an atmospheric environment, an absolute humidity of the atmospheric environment, and whether an image formation that precedes a subsequent image formation is performed in single-sided printing or double-sided printing. | 12-03-2009 |
20090297185 | IMAGE FORMING APPARATUS - An image forming apparatus which predicts VL fluctuates of a photosensitive drum, taking a rotation speed of the photosensitive drum during image formation into consideration, and controls the image formation based on the prediction, for always obtaining an image of a stable density. The image forming apparatus performs appropriate image formation control by controlling image forming conditions based on a photosensitive member rotation time, a photosensitive member stop time, a temperature of the environment, an absolute humidity of the environment, and the rotation speed of the photosensitive member. | 12-03-2009 |
20090297190 | IMAGE FORMING APPARATUS - There is provided an image forming apparatus that accurately obtains the dynamic characteristic of the apparatus when a foreign substance is adhered to a driving roller for driving an endless belt, such as a facing roller. To accomplish this, the image forming apparatus uses an optical sensor to detect information of a foreign substance on the facing roller. When it is determined that there is no foreign substance information, the image forming apparatus executes profile detection of an intermediate transfer belt using the nominal circumference of the facing roller. When the optical sensor detects foreign substance information, the image forming apparatus measures the circumference of the facing roller, and performs profile detection of the intermediate transfer belt using the measured circumference of the facing roller. | 12-03-2009 |
20100322643 | IMAGE FORMING APPARATUS - An image forming apparatus is provided that includes a detection unit to detect a measure of consumption of a second cartridge. A difference between toner amounts is acquired by subtracting a toner amount per unit area of a toner image corresponding to a maximum density image formed on a first image bearing member from a toner amount per unit area of a toner image corresponding to a maximum density image formed on a second image bearing member. When the detection unit detects a second measure of consumption that is in a consumed state more than a first measure of consumption, a control unit controls a first toner forming unit and a second toner forming unit so that a difference between toner amounts is greater than when the detection unit detects the first measure of consumption. | 12-23-2010 |
20110243599 | IMAGE FORMING APPARATUS - An image forming apparatus including, a plurality of image bearing members, a plurality of developing units which includes toner storage containers and a belt transferring toner images onto a transfer material, the image forming apparatus being capable of executing a first cleaning mode and a second cleaning mode to move the toner adhering onto the belt onto the image bearing members and to collect the adhering toner into the toner storage containers, wherein, in the first cleaning mode, the adhering toner is collected into the toner storage container of the developing unit developing a black toner, and in the second cleaning mode, a portion of the adhering toner is collected into the toner storage container corresponding to the image bearing member located at a most upstream position and a rest of the adhering toner is collected into the toner storage container of the developing unit developing the black toner. | 10-06-2011 |
20120148286 | IMAGE FORMING APPARATUS - In an image forming apparatus, a control unit is capable of carrying out a cleaning mode with a first step of allowing an image forming unit to form, on an image bearing member, a cleaning toner image with a length according to a length of a feeding member or conveying member in a direction orthogonal to a conveyance direction of the recording material, a second step of moving the cleaning toner image from the image bearing member to a transfer member, and a third step of moving the cleaning toner image from the transfer member to the image bearing member. This allows the transfer member to be efficiently cleaned, providing appropriate images prevented from suffering a transfer failure. | 06-14-2012 |
20120195612 | IMAGE FORMING APPARATUS - There is provided an image forming apparatus that accurately obtains the dynamic characteristic of the apparatus when a foreign substance is adhered to a driving roller for driving an endless belt, such as a facing roller. To accomplish this, the image forming apparatus uses an optical sensor to detect information of a foreign substance on the facing roller. When it is determined that there is no foreign substance information, the image forming apparatus executes profile detection of an intermediate transfer belt using the nominal circumference of the facing roller. When the optical sensor detects foreign substance information, the image forming apparatus measures the circumference of the facing roller, and performs profile detection of the intermediate transfer belt using the measured circumference of the facing roller. | 08-02-2012 |
20140029963 | COLORIMETRY APPARATUS AND IMAGE FORMING APPARATUS - The colorimetry apparatus includes a light source for emitting light to a surface of a detected object, a diffraction grating for spectrally separating, for each wavelength, the light emitted from the light source and reflected by the detected object, and a line sensor including multiple pixels, for receiving the light, which is spectrally separated by the diffraction grating, for the each wavelength by the multiple pixels. The light source and the line sensor are arranged on the common substrate. | 01-30-2014 |
20140161500 | FIXING APPARATUS - A fixing apparatus for fixing a toner image on a recording material through a nip includes a sleeve; a nip forming member contacting an inner surface of the sleeve; a halogen heater provided in the sleeve; and a back-up member cooperating with the nip forming member to form the nip through the sleeve, wherein a surface of the nip forming member which contacts an inner surface of the sleeve is convex in a direction of approaching the back-up member, from each of opposite end portions thereof toward a central portion thereof with respect to a generatrix direction of the sleeve. | 06-12-2014 |