Patent application number | Description | Published |
20090073469 | COLOR IMAGE FORMING APPARATUS AND COLOR ADJUSTMENT METHOD - A color image forming apparatus specifies print mode (media), forms a test image based on gradation levels of a plurality of colors according to the specified print mode (media), and detects the test image with a color sensor. The color image forming apparatus performs gray axis correction calculation based on detection result obtained by the color sensor. | 03-19-2009 |
20090087207 | IMAGE-FORMING APPARATUS AND CONTROL METHOD THEREOF - An image-forming apparatus sets a DAC output voltage | 04-02-2009 |
20090251715 | COLOR IMAGE FORMING APPARATUS, AND IMAGE FORMING CONDITION SETTING METHOD FOR COLOR IMAGE FORMING APPARATUS - Specification of a printing mode or medium is identified, and gray axis correction control is performed based on the identified printing mode or medium. Subsequently, determination is made regarding whether or not to predict a value equivalent to the results of the gray axis correction control, for a different printing mode or medium, based on the results. If certain conditions are satisfied, the results of prediction are taken as the results of the gray axis correction control for the different printing mode. | 10-08-2009 |
20110217052 | COLOR IMAGE FORMING APPARATUS HAVING FUNCTION OF OBTAINING COLOR INFORMATION OF PATCH - An image forming apparatus uses the difference in time taken for each patch to reach a color sensor, which occurs upon reversing the conveyance direction of a printing material. Due to this difference in time, the temperature of the printing material in detection by the color sensor differs among the respective patches. The error of a colorimetric value due to thermochromism is reduced by placing a patch with a colorimetric value which has a low temperature dependence so as to be detected earlier, and a patch with a colorimetric value which has a high temperature dependence so as to be detected later. | 09-08-2011 |
20120236338 | COLOR IMAGE FORMING APPARATUS AND COLOR ADJUSTMENT METHOD - A color image forming apparatus specifies print mode (media), forms a test image based on gradation levels of a plurality of colors according to the specified print mode (media), and detects the test image with a color sensor. The color image forming apparatus performs gray axis correction calculation based on detection result obtained by the color sensor. | 09-20-2012 |
20120327405 | COLOR MEASUREMENT DEVICE AND IMAGE FORMING APPARATUS - The color measurement device and an image forming apparatus using the same includes a light source for irradiating a color measurement object with white light; a diffraction grating for dispersing the light reflected from the color measurement object; and a line sensor formed of multiple pixels that generate an electric signal corresponding to the intensity of the light dispersed by the diffraction grating, wherein the light source includes a light-emitting diode having a peak value of emission intensity in a wavelength zone of 380 nm to 420 nm, and a plural types of fluorescent members each having a peak value of fluorescence intensity in a wavelength zone of 420 nm to 730 nm. | 12-27-2012 |
20130016352 | SPECTRAL COLOR SENSOR AND IMAGE FORMING APPARATUSAANM Kita; HiroshiAACI Mishima-shiAACO JPAAGP Kita; Hiroshi Mishima-shi JPAANM Ebihara; Shun-ichiAACI Suntou-gunAACO JPAAGP Ebihara; Shun-ichi Suntou-gun JP - A spectral color sensor including a spectroscopic unit that disperses reflected light from a measurement target, and a light detection element that detects the dispersed light from the reflected light, comprises: a storage unit that stores a correspondence relationship between a pre-measured wavelength of the dispersed light projected on the light detection element and a projection position, as well as a stray light component; a first correction unit that, based on a measurement result when a color is measured, corrects the correspondence relationship between the wavelength of the dispersed light projected on the light detection element and the projection position stored in the storage unit; and a second correction unit that carry out wavelength correction on the stray light component stored in the storage unit using the corrected correspondence relationship between the wavelength and the projection position. | 01-17-2013 |
20130038867 | SPECTROCOLORIMETER AND IMAGE FORMING APPARATUS - A spectrocolorimeter comprises: a calculation unit configured to calculate wavelengths of dispersing light rays respectively received by a plurality of pixels included in a light detection unit using a correspondence relationship between pixels and wavelengths of a plurality of extremal value points in a profile of dispersing light rays detected by the light detection unit upon execution of colorimetry of a reference object to be measured, wherein when the calculation unit calculates the wavelengths of the dispersing light rays respectively received by the plurality of pixels, the calculation unit adjusts a colorimetry condition for respective extremal value points so that signals to be output from pixels corresponding to the plurality of extremal value points have output levels which are not less than a reference and are not saturated. | 02-14-2013 |
20130114968 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image bearing member; a rotatable transfer member; a conveying portion for conveying a recording material; a controller for controlling an operation for forming a test image of a toner on the image bearing member in an interval region between consecutive output images of the toner; and a detecting portion for detecting the test image. The controller permits the formation of the test image, when next one of the consecutive output images is to be transferred onto a first side of the recording material, and the controller is capable of preventing the formation of the test image, when next one of the consecutive output images is to be transferred onto a second side of the recording material. | 05-09-2013 |
20130136473 | IMAGE FORMING APPARATUS - An image forming apparatus includes an intermediary transfer member for carrying an image; a transferring device for transferring the image from the intermediary transfer member onto a sheet; a device for forming a toner patch for a density adjustment between adjacent sheets, in an area corresponding to between adjacent ones of sheets on the intermediary transfer member; a detector for detecting density of the patch; and a sheet interval density adjusting device for adjusting in real time a density/tone-gradation property of the image on the basis of a detection result of the density detector. The patch includes a density detection area, and an outer marginal portion having a density lower than that of the density detection area. The patch forming device changes at least one of a patch image density of the density detection area, a size of the marginal portion and a density of the marginal portion. | 05-30-2013 |
20140044444 | COLOR IMAGE FORMING APPARATUS HAVING FUNCTION OF OBTAINING COLOR INFORMATION OF PATCH - An image forming apparatus uses the difference in time taken for each patch to reach a color sensor, which occurs upon reversing the conveyance direction of a printing material. Due to this difference in time, the temperature of the printing material in detection by the color sensor differs among the respective patches. The error of a colorimetric value due to thermochromism is reduced by placing a patch with a colorimetric value which has a low temperature dependence so as to be detected earlier, and a patch with a colorimetric value which has a high temperature dependence so as to be detected later. | 02-13-2014 |
20150063834 | IMAGE FORMING APPARATUS - An image forming apparatus includes a mounting portion to and from which a process cartridge including a photosensitive member and a developing roller is attachable and detachable, a separation mechanism that takes a first position to separate the developing roller from the photosensitive member and a second position to bring the developing roller into contact with the photosensitive member, an allowance mechanism that allows the process cartridge with the developing roller kept in contact with the photosensitive member to be mounted on the mounting portion when the separation mechanism is in the first position, an exposure device, and a control unit, wherein, when the developing roller and the photosensitive member are in contact with each other when the separation mechanism is in the first position, the control unit performs an exposure operation while keeping the separation mechanism in the first position during an initial operation of the image forming apparatus. | 03-05-2015 |