Patent application number | Description | Published |
20080292333 | IMAGE FORMING APPARATUS - An image forming apparatus that forms a latent image on an image carrier based on image data, the apparatus includes: a first calculating unit adapted to calculate an exposure amount of a pixel of interest included in a partial region configured of a plurality of pixels that constitute the image data; a second calculating unit adapted to calculate an exposure amount of surrounding pixels that are located around the pixel of interest and constitute the partial region; and a toner consumption amount calculating unit adapted to calculate a toner consumption amount of the pixel of interest based on the exposure amount of the pixel of interest and the exposure amount of the surrounding pixels, wherein the second calculating unit calculates the exposure amount of the pixel of interest by weighting the image data corresponding to the surrounding pixels on a pixel-by-pixel basis. | 11-27-2008 |
20090135243 | IMAGE FORMING APPARATUS AND ITS CONTROL METHOD - A first process unit replaces a portion of pixels in a pixel sequence forming a first scanning line of a first color by a different portion of pixels in a pixel sequence forming a second scanning line of the first color. A second process unit performs a thicken process to a pixel sequence of a scanning line of a second color superimposed on the first line of the first color to thicken the pixel sequence of the scanning line of the second color. The pixel sequence of the scanning line to be thickened corresponds a replacement point of the replaced pixel of the first color. | 05-28-2009 |
20100111567 | IMAGE FORMING APPARATUS - An image forming apparatus that can improve image quality by correcting for variations in the potential characteristics of a photosensitive member and enhance the responsiveness of an image forming operation. The photosensitive member is rotated by a drive unit and exposed to light from an exposure unit. A first generation unit periodically generates a first signal. A second generation unit generates a second signal. A plurality of generation periods of the second signals are included in one generation period of the first signal. A control unit, while the photosensitive member is controlled to accelerate, counts the second signals in response to input of the first signal, identifies an exposure position when the photosensitive member is switched from the acceleration control to constant-speed control, reads correction data corresponding to the identified exposure position from a storage unit, and controls the light quantity of the exposure unit. | 05-06-2010 |
20130286132 | IMAGE FORMING APPARATUS - An image forming apparatus is provided that can adjust an inclination deviation even after a laser scanner unit and a photosensitive drum are embedded. A CPU | 10-31-2013 |
20130286134 | IMAGE FORMING APPARATUS THAT CONTROLS CORRECTION OF IMAGE FORMING POSITIONS AND METHOD OF CONTROLLING THE SAME - An image forming apparatus capable of correcting light amounts of light beams which expose a photosensitive member with simple construction. The image forming apparatus includes a photosensitive drum, and a beam scanning device including a plurality of semiconductor lasers which emit light beams for exposing the photosensitive drum, and a memory which stores first correction data for correcting the light amount of each light beam in a manner associated with each of the plurality of semiconductor lasers. A CPU outputs second correction data for being commonly used in correcting the light amounts of the light beams emitted from the plurality of semiconductor lasers to the beam scanning device. A laser driver IC provided in the beam scanning device controls the light amount of the light beam emitted from each semiconductor laser based on the first correction data and the second correction data. | 10-31-2013 |
20130286142 | IMAGE FORMING APPARATUS - Density unevenness caused by an optical facet angle error or the like of a polygon mirror which has a plurality of reflection planes is corrected after shipment with a simple configuration. At least one of the plurality of reflection planes is identified as a reference plane. A plurality of pieces of light amount adjustment data for changing the light amount of light deflected for each reflection plane with the reference plane as a reference, and at least one piece of light amount correction data for correcting the light amount based on the plurality of pieces of light amount adjustment data are stored. When a light source emits light, one mode can be selected out of a test print mode (S | 10-31-2013 |
20140375744 | IMAGE FORMING APPARATUS - In APC, if light power control with different target light powers is continuously executed, the amplitude of an output signal from a light-receiving element after the light power control is changed is generated, and a long time is required for completion of the light power control after the change. To address the problem, light power control with the same target light power is continuously executed on at least two light-emitting points in APC. | 12-25-2014 |
20150160582 | IMAGE FORMING APPARATUS EMPLOYING OPTICAL SCANNING APPARATUS THAT SCANS USING MULTIPLE BEAMS OF LIGHT EMITTED FROM MULTIPLE LIGHT SOURCES DRIVEN BY MULTIPLE DRIVING ICS - A light source array includes a first group of light sources having laser elements and a second group of light sources having laser elements. A first laser driver drives the laser elements and a second laser driver drives the laser elements. The first group of light sources and the second group of light sources execute multiple exposure. For example, the second group of light sources executes a first exposure and the first group of light sources executes a second exposure. In other words, the first group of light sources and the second group of light sources are driven by the first laser driver and the second laser driver, respectively, so as to expose the same position. | 06-11-2015 |