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| Number | Title | Issue Date |
| 8184139 | Redundance control of temperature compensation for a LED printhead A driving apparatus having driving circuits formed to correspond to driven circuits arranged on a circuit board. Each driving circuit includes a driving control unit for driving the corresponding driven circuit, a reference voltage generation unit for generating a r... | 05/22/2012 |
| 8159516 | Multibeam laser control device for image forming apparatus An image data is pre-processed in parallel by a pre-processing unit (A) and a pre-processing unit (B) arranged in parallel. The image data is transferred in synchronization with an image processing signal obtained by ORing a BD signal and an interpolation signal. La... | 04/17/2012 |
| 8149258 | Image forming apparatus and control method For suppressing density unevenness which is caused by changes in a main scanning line interval of a laser beam on the image bearing member due to a polygonal face tangle, laser luminance is controlled so as to maintain the density unevenness with a spatial frequency... | 04/03/2012 |
| 8144177 | Image formation apparatus and image formation method An image formation apparatus for executing image formation by exposing an image carrier with irradiation light emitted from a laser source on the basis of an input signal to drive the laser source includes a correction amount calculation unit configured to calculate... | 03/27/2012 |
| 8134585 | Light-emitting element head, image forming apparatus and light-emission control method A light-emitting element head includes: plural light-emitting element array chips that are divided into plural groups and that each are provided with light-emitting elements arranged in an array; a signal generation unit that generates a light-emission control signa... | 03/13/2012 |
| 8130252 | Optical head, exposure apparatus and image forming apparatus capable of restricting noise An optical head expresses gray scales of pixels, which belong to a block constituted by n pixels and m pixels in a first and second direction, respectively. The optical head includes light emitting devices that extend in the first direction and emit light; driving t... | 03/06/2012 |
| 8059146 | Exposure device, image forming apparatus, and computer-readable medium An exposure device includes a plurality of light emitting elements, a load, a first supplying unit and a second supplying unit. The first supplying unit supplies a driving current to one of (i) light emitting elements used to form an image among the plurality of lig... | 11/15/2011 |
| 8054324 | Optical head and image forming apparatus An optical head includes a plurality of unit regions repeatedly arrayed in one direction. Each region is constituted by a light-emitting element which is driven by a current to emit light, a control transistor which is connected in parallel with the light-emitting e... | 11/08/2011 |
| 8054325 | Optical scanning apparatus, image forming apparatus and control method An optical scanning apparatus capable of being applied to an image forming apparatus includes a light source which emits a light beam; a modulator which pulse-width modulates drive current supplied to the light source; and a current adding unit which adds a suppleme... | 11/08/2011 |
| 8026939 | Optical printer head and image forming apparatus equipped with the same The invention relates to an optical printer head 12 provided with one or a plurality of light emitting element array units 3. The light emitting element array unit 3 is provided with a circuit board 30, a base member 33 supporting ... | 09/27/2011 |
| 8022974 | Exposure device, image forming apparatus and computer readable medium storing program for exposure control An exposure device includes plural light emitting elements that light in turn for exposure, plural driving elements that drive each of the light emitting elements and a time changing member that changes one time period of a switching signal to switch light emitting ... | 09/20/2011 |
| 8004550 | Light-emitting element head, image forming apparatus and signal supply method The light-emitting element head includes: a first signal supply unit supplying a first signal for sequentially specifying a plurality of light-emitting elements one by one as a control target for control in common to light-emitting element chips; a second signal sup... | 08/23/2011 |
| 7990407 | Drive circuit, light print head, and image forming apparatus A drive circuit is provided for supplying a drive current to drive a plurality of driven elements each having two main electrodes. The drive circuit includes a switch circuit for receiving a drive signal; and a constant voltage circuit connected to the switch circui... | 08/02/2011 |
| 7961209 | Integrated circuit that emits light, optical head that incorporates the integrated circuit, and image forming apparatus that uses the optical head Each of a plurality of driver circuits includes a first 3-terminal switch element, a second 3-terminal switch element, and a 3-terminal light emitting element driven by the first 3-terminal switch element. The first 3-terminal switch element in a first circuit of ad... | 06/14/2011 |
| 7948512 | Image forming apparatus with separate controllers for independently controlling an irradiating section A main controller controls drive of an LSU for irradiating laser light onto a charged photoreceptor, based on control data read from a non-volatile memory. The main controller causes the LSU to irradiate a beam of light onto the photoreceptor so as to form on the ph... | 05/24/2011 |
| 7916162 | Light output device and image forming apparatus including the light output device A light output device includes: an output unit including a light source; a control voltage generation unit that detects output power of the light source, and generates a control voltage for controlling a drive current of the light source; a control unit that sets a ... | 03/29/2011 |
| 7872663 | Light emitting device, image processing device, and electronic apparatus A light emitting device includes a plurality of light emitting elements, a first storage unit that stores first correction values corresponding to the light emitting elements, a counting unit that counts the number of pixels whose gray-scale values designated by ima... | 01/18/2011 |
| 7852362 | Image writing device using digital light-emitting elements An image-data transfer controller divides one line of image data for each of a plurality of light-emitting-element array units, transfers the divided image data to respective light-emitting-element array units, to drive light-emitting elements in the light-emitting-... | 12/14/2010 |
| 7852364 | Line head and an image forming apparatus using the line head A line head, includes: a head substrate; a first light emitting element group which is arranged on the head substrate and includes a first light emitting element and a second light emitting element; a second light emitting element group and a third light emitting el... | 12/14/2010 |
| 7852363 | Light scanning apparatus, image forming apparatus, and light power control method A light scanning apparatus includes a plurality of light sources. A detection unit detects the light power of a light beam output from at least one of the plurality of light sources. A control unit controls the driving current of at least one selected light source o... | 12/14/2010 |
| 7746370 | Image forming apparatus and method of controlling same One scanning interval of a laser beam is divided into a plurality of blocks, correction data, which corresponds to optical characteristics of an optical unit placed between a laser element and a photosensitive drum, is stored in memory in association with each block... | 06/29/2010 |
| 7710443 | Providing data A method comprising storing a first line of data that is received from processing circuitry across a first set of conductors prior to receiving a first signal from a laser engine having a plurality of laser units and providing the first line of data and a second lin... | 05/04/2010 |
| 7701480 | Light-source driving device, optical scanning device, and image forming apparatus A circuit for driving a plurality of light emitting units includes a current biasing unit that biases a light emitting current with an overshoot current and supplies the resultant current to each of the light emitting units. The light emitting current is determined ... | 04/20/2010 |
| 7671882 | Semiconductor laser modulation driving apparatus and image forming apparatus A semiconductor laser modulation signal is generated for modulating a semiconductor laser. The semiconductor laser is driven based on the semiconductor laser modulation signal. An output impedance of a semiconductor laser modulation signal generating unit and an inp... | 03/02/2010 |
| 7663655 | Light-emitting device and image forming apparatus A light-emitting device has a plurality of pixel circuits arranged in one direction, each of the plurality of pixel circuits having a light-emitting element that emits light according to the amount of driving current, a driving transistor that supplies the driving c... | 02/16/2010 |
| 7623148 | Optical scanning apparatus, method of controlling amount of light, and image forming apparatus An optical scanning apparatus includes an approximation formula determination unit, a sensitivity correction value determination unit and a bias current controller. The approximation formula determination unit determines an nth-order approximation formula and an mth... | 11/24/2009 |
| 7619644 | Method and apparatus for image alignment Apparatus, systems, and methods presented herein allow for the alignment of images. In some embodiments, a plurality of PWM modules each receive input data and corresponding input phase-shifted clock signals. In some embodiments, each PWM module generates an output ... | 11/17/2009 |
| 7573495 | Pixel circuit, light-emitting device, and image forming apparatus A pixel circuit includes a light-emitting element which emits light having the intensity corresponding to an amount of a driving current; a driving transistor which supplies the driving current to the light-emitting element; a storing circuit which writes a data sig... | 08/11/2009 |
| 7542062 | Integrated circuit of an image forming apparatus having drive circuits An image forming apparatus includes: a main motor that drives a photosensitive element; a polygon motor that drives a polygon mirror; a main motor drive circuit that drives the main motor; a polygon motor drive circuit that drives the polygon motor; a package; and a... | 06/02/2009 |
| 7535483 | Image forming apparatus and image forming method An image forming apparatus of the invention includes plural photoconductive bodies for forming a color image, an exposure unit to scan a laser light in a main scanning direction of each of the plural photoconductive bodies and to perform exposure, and a light amount... | 05/19/2009 |
| 7453485 | Image writing apparatus for controlling transfer of image data A light-emitting-element array unit includes a plurality of light-emitting-element arrays in which a plurality of light-emitting elements that is controlled based on binary image data is arranged in a row. An image-data-transfer control unit divides image data corre... | 11/18/2008 |
| 7443413 | Laser diode modulator and method of controlling laser diode modulator A method for adjusting a laser diode drive current pulse, comprises providing a power correction table comprising drive current pulse correction factors corresponding to counter positions. The method also comprises providing a jump table comprising counter position ... | 10/28/2008 |
| 7425976 | Variable frequency generator A digital circuit generates very precise varying clock frequencies for applications that can tolerate a small degree of jitter but require exact longer term frequencies, e.g. a video clock for a laser printer. Some subpixel jitter is acceptable, but the overall pixe... | 09/16/2008 |
| 7425971 | Line head and image forming apparatus incorporating the same In a line head, a plurality of element arrays arranged in a first direction. Each array includes a plurality of light emission elements arrayed in a second direction which is perpendicularly to the first direction. The light emission elements emit light for forming ... | 09/16/2008 |
| 7403215 | Current driver and power control for electrophotographic devices Laser driver systems and methods are provided for controlling a laser driver coupled to a suitable laser source. The laser driver comprises a plurality of current sources, including at least one bias current source and at least two switched current sources. To contr... | 07/22/2008 |
| 7397491 | Light-emitting device and image forming apparatus A light-emitting device has a plurality of pixel circuits arranged in one direction, each of the plurality of pixel circuits having a light-emitting element that emits light according to the amount of driving current, a driving transistor that supplies the driving c... | 07/08/2008 |
| 7372170 | Flip chip interconnection pad layout A flip chip interconnect pad layout has the die signal pads are arranged on the die surface near the perimeter of the die, and the die power and ground pads arranged on the die surface inboard from the signal pads; and has the signal pads on the corresponding packag... | 05/13/2008 |
| 7369151 | Laser control circuit and image forming apparatus An image data processing section subjects input image data to image processing, and outputs first to fourth image data. First to fourth pulse width modulation circuits are PWM circuits in each of which a plurality of reference positions are set in one pixel, and out... | 05/06/2008 |
| 7352784 | Laser burst boosting method and apparatus Methods and apparatus for managing thermal loads on a laser gain medium and for boosting the output power of a diode pumped laser are disclosed. The short-term average pumping power to the gain medium is increased, to provide a burst of pumping energy to the laser g... | 04/01/2008 |
| 7353470 | Variable clocked scan test improvements Addition of specific test logic may improve the level of test vector compression achieved from existing variable scan test logic. Methods for determining the compressed vectors' states, given the desired uncompressed vectors' values may be used, and techniques for s... | 04/01/2008 |
