| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 347116000 | Registration | 17 |
| 20100245519 | Systems and Methods for Reducing Color Registration Errors in Tandem Engines - Systems and methods are provided for correcting color registration errors in a printing device comprising a plurality of print engines driven by a single pixel frequency clock. In some embodiments, the print engines can include a reference print engine and one or more non-reference print engines. An adjusted resolution may be computed for color data sent to each non-reference engine to offset color registration errors attributable to the non-reference engine. The adjusted resolution is computed using calibration information for the non-reference print engines relative to the reference engine, and resolution information for color data processed by the first reference engine. The resolution of color data processed by each non-reference print engine is adjusted according to the computed adjusted resolution for the non-reference engine and sent to the print engines for printing. | 09-30-2010 |
| 20110007120 | Image Forming Apparatus - In an image forming apparatus that forms a color image by transferring toner images for respective colors formed on plural rotary photoreceptor drums onto a sheet through an intermediate transfer member, when a controller judges that magnification deviation is generated in a main-scanning direction in superposition of the toner images for respective colors, the controller forms a first color registration deviation detecting mark for detecting at least an amount of deviation in the main scanning direction on the intermediate transfer member, and when the controller judges that the magnification deviation is not generated in the main-scanning direction in the superposition of toner images for respective colors, the controller forms a second color registration deviation detecting mark for detecting only an amount of deviation in a sub scanning direction perpendicular to the main-scanning direction on the intermediate transfer member. | 01-13-2011 |
| 20110043588 | Image forming apparatus and image forming method - An image forming apparatus and image forming method capable of achieving both high-speed printing of less-than-full-color images and high quality printing of multicolor images. The apparatus includes a color shift pattern output unit, a correction amount acquisition unit, and a correction unit to correct at least one or more positions of an image in a sub-scanning direction on a recording medium when a first transfer member transfers an unfixed image and a second transfer member transfers an unfixed image. | 02-24-2011 |
| 20110193922 | IMAGE FORMING APPARATUS - An image forming apparatus is capable of more accurately detecting the relationship between an actual amount of color deviation and an estimated amount of color deviation. The image forming apparatus forms a color deviation detection mark at timing when the estimated amount of deviation reaches a threshold value. The timing is different from the timing when it is determined that it is necessary to perform normal calibration. The image forming apparatus determines the relationship between the actual amount of deviation of an image forming position from a reference and the estimated amount of deviation to set an estimating unit for estimating the amount of deviation. | 08-11-2011 |
| 20110205324 | IMAGE FORMING APPARATUS FOR CORRECTING SUB-SCANNING MISALIGNMENT OF BEAMS ON A PHOTOCONDUCTOR - An image forming apparatus forms a latent image on a photoconductor by irradiating light beams from a plurality of light sources onto the photoconductor. A detection unit detects a time difference between timings of start writing on the photoconductor by the light beams in a main scanning direction. A calculation unit calculates a shift of each of the light beams in a sub-scanning direction based on the time difference detected by the detection unit and a rotation speed of the photoconductor. A correction unit corrects irradiated positions on the photoconductor by the light beams in the sub-scanning direction based on the shift calculated by the calculation unit. | 08-25-2011 |
| 20110228027 | IMAGE FORMING APPARATUS AND METHOD FOR DETECTING POSITION DEVIATION - An image forming apparatus includes a photoconductor drum, a first printer head that forms a first pattern on the photoconductor drum and has a first end part, a second printer head that forms second and third patterns on the photoconductor drum and has a second end part that overlaps the first end part in a main scanning direction, a detection sensor that detects the densities of first and second test patterns formed at an area of the photoconductor drum at which the first and second end parts overlap, the first test pattern being formed by combining the first and second patterns, the second test pattern being formed by combining the first and third patterns, and a determination part that determines a deviation direction between the first and second printer heads by comparing the densities detected by the detection sensor. | 09-22-2011 |
| 20120038731 | IMAGE FORMING APPARATUS - An image forming apparatus comprises: an exposure unit configured to irradiate each of a plurality of photosensitive members with a light beam, a light amount control unit configured to control a light amount of the light beam, a plurality of developing units configured to develop electrostatic latent images, formed on the plurality of photosensitive members by exposure with the light beams, and a transfer unit configured to transfer toner images formed on the plurality of photosensitive members onto an image carrier; a pattern forming unit configured to control the image forming unit to form, a misalignment detection pattern for detecting a relative misalignment between the toner images transferred onto the image carrier; a pattern reading unit configured to read the misalignment detection pattern; and a correction unit configured to correct the relative misalignment between the toner images based on the reading result obtained by the pattern reading unit. | 02-16-2012 |
| 20120062681 | OPTICAL WRITING DEVICE, IMAGE FORMING APPARATUS, AND METHOD AND PROGRAM PRODUCT FOR CONTROLLING OPTICAL WRITING DEVICE - An optical writing device that forms an electrostatic latent image on a photoreceptor. The device includes a pixel-information acquiring unit, a line-pixel-information storage unit that stores the acquired pixel information corresponding to a plurality of lines for each main scanning line, a light source device that exposes the photoreceptor with a period corresponding to an N-fold sub-scanning direction resolution of the pixel information, a positional-shift-information storage unit that stores a positional shift information, a sub-line counting unit that counts a sub-line period, a reading-line selecting unit that performs N times of selection that determines which main scanning line is selected as the line from which the pixel information is read out, on the basis of a calculated value from the counted value of the sub-line period and the positional shift information, and a pixel-information reading unit. | 03-15-2012 |
| 20120229585 | Image Forming Apparatus, Image Forming Method, And Computer Program Product - An image forming apparatus that includes an optical writing device for applying light corresponding to image data to form a first image of the image data includes: a temperature detecting unit that detects temperature at a plurality of positions in the optical writing device; and an adjustment processing unit that, when a temperature difference between the positions detected by the temperature detecting unit is out of a predetermined range, forms a second image for quality verification and performs a process for adjusting color registration of the first image by using the second image. | 09-13-2012 |
| 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 |
| 20140146120 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus includes a sheet-linear-velocity setting unit, an image-formation-rate changing unit, a detecting unit, and first and second correcting units. When printing is performed with a first sheet linear velocity, the first correcting unit performs misregistration correction according to a result of detection of a misregistration correction pattern image by the detecting unit. When the sheet-linear-velocity setting unit sets a second sheet linear velocity other than the first sheet linear velocity, the second correcting unit corrects an adjustment amount used in the misregistration correction performed by the first correcting unit, according to a ratio between first and second coefficients. The first coefficient indicates a ratio of an actual image formation rate at the first sheet linear velocity to an ideal image formation rate, and the second coefficient indicates a ratio of an actual image formation rate at the second sheet linear velocity to an ideal image formation rate. | 05-29-2014 |
| 20140152754 | OPTICAL WRITING CONTROL DEVICE, IMAGE FORMING APPARATUS, AND METHOD OF CONTROLLING OPTICAL WRITING DEVICE - An optical writing control device includes a light emission control unit that controls light emission of a light source to exposes a photosensitive element. The light emission control unit is configured to draw two patterns as patterns for correction used to correct a transfer position of a developer image obtained by developing an electrostatic latent image formed on the photosensitive element, the two patterns including a narrow width pattern where a width of the pattern corresponds to a width of a detection area of a sensor that detects the patterns, in the main-scanning direction, and a wide width pattern having a wider width than the narrow width pattern, and control the light emission, after calculation of a correction value based on a detection signal of the wide width pattern is properly completed, in a manner where the narrow width pattern is drawn upon the calculation of the correction value. | 06-05-2014 |
| 20140168338 | IMAGE FORMING APPARATUS THAT SUPPRESSES OCCURRENCE OF COLOR SHIFT IN IMAGES AND METHOD OF CONTROLLING THE SAME - An image forming apparatus that suppresses occurrence of color shift in images transferred from image bearing members onto an intermediate transfer member. A surface of each of a first photosensitive drum and second photosensitive drums is charged. An exposure device, provided for each photosensitive drum, forms an electrostatic latent image by exposing an associated one of the charged photosensitive drums. A developing device, provided for each photosensitive drum, develops the electrostatic latent image with toner. An intermediate transfer belt friction-drives the photosensitive drums for rotation and has the developed images transferred thereon. Timing for exposing the second photosensitive drums is controlled based on a first surface distance from an exposure light irradiated position to a primary transfer position of the first photosensitive drum, and a second surface distance from an exposure light irradiated position of each second photosensitive drum to a primary transfer position thereof. | 06-19-2014 |
| 20140240430 | IMAGE FORMING APPARATUS AND METHOD OF IMAGE FORMING - An image forming apparatus includes an image forming unit to perform printing using a light source unit and a photosensitive medium, a registration unit to adjust an exposure time to correspond to a change in a power of a light source when the power of the light source changes, and a controller to control the image forming unit to perform printing according to the adjusted exposure time. | 08-28-2014 |
| 20140267526 | IMAGE FORMING APPARATUS THAT PREVENTS IMAGE DEFECT CAUSED BY OFF-CENTERING OF ROTATING SHAFT OF PHOTOSENSITIVE DRUM - An image forming apparatus that is capable of forming an electrostatic latent image on the surface of a photosensitive member with high position accuracy even when the shaft of the photosensitive member is off-centered. In the apparatus, exposure devices form electrostatic latent images on respective photosensitive drums, and developing devices develop the electrostatic latent images. An intermediate transfer belt rotates in contact with the photosensitive drums. A rotary encoder detects a rotational speed of a drum shaft of each photosensitive drum. An amount of off-centering of the drum shaft is detected, and a correction coefficient for correcting positional displacement of electrostatic latent images is calculated. A control unit corrects timing of exposure using the calculated correction coefficient, and controls the exposure device to form the image on the photosensitive drum based on the corrected timing of exposure. | 09-18-2014 |
| 20150301471 | IMAGE FORMING APPARATUS CAPABLE OF CORRECTING POSITION OF IMAGE TO BE FORMED - An image forming apparatus capable of controlling an image forming position with high accuracy. The image forming apparatus has a plurality of image forming sections each including a photosensitive drum and a laser scanner. The laser scanner exposes the photosensitive drum to form an electrostatic latent image thereon. The image forming section develops the electrostatic latent image formed on the photosensitive drum to form a toner image, and the toner image is transferred onto an intermediate transfer belt. A thermistor in the laser scanner detects the internal temperature of the laser scanner. The image forming apparatus controls the image forming sections to form detection patterns on the intermediate transfer belt. An image forming position is corrected based on the temperature detected by the thermistor and a result of measurement of the detection patterns. | 10-22-2015 |
| 20160116858 | IMAGE FORMING APPARATUS AND OPTICAL SCANNING APPARATUS - An image forming apparatus, including: a temperature detecting element provided on an opposite side of a first and a second light sources with respect to a deflection unit in an optical box and provided between a first lens and a second lens, which a first and a second light beams emitted from the first and second light sources and deflected by a rotary polygon mirror enter first, respectively, the temperature detecting element being configured to detect an internal temperature of the optical box; and a control unit configured to control lighting-up timings based on image data of the first and second light sources based on a detection result of the temperature detecting element so that misregistration between a first toner image and a second toner image transferred from the first and second photosensitive members onto the sheet is suppressed. | 04-28-2016 |
