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| Number | Title | Issue Date |
| 8174553 | Apparatus and method for controlling power of laser diode having optical power compensation An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output volta... | 05/08/2012 |
| 8169455 | Optical scanning device, image forming apparatus, control method, and computer program product In an optical scanning device including a vertical cavity surface emitting laser (VCSEL), an optical scanning device controls so as to satisfy P1Ws, where P1 is light intensity obtained when a period of time corresponding to a minim... | 05/01/2012 |
| 8164611 | Multibeam image forming A first beam splitter splits each laser beam into a first beam and a second beam. A deflecting unit deflects a direction of the second beam. A second beam splitter splits the second beam into multiple split beams. A first photoelectric converting unit measures inten... | 04/24/2012 |
| 8154577 | Apparatus and method of controlling light level of a light source, and recording medium storing program of controlling light level of a light source An apparatus and a method of controlling a light level of a light beam irradiated by a light source are provided. The light source is caused to irradiate the light beam having a light level determined based on a light level correction value for a specific main scann... | 04/10/2012 |
| 8144176 | Exposure apparatus, method for correcting emission quantity of exposure apparatus, and image forming apparatus An exposure apparatus has a plurality of light emitting elements and a light quantity measuring circuit, sets a reference light quantity based on a plurality of emission quantities when the plurality of light emitting elements emit light in accordance with a specifi... | 03/27/2012 |
| 8130251 | Method and apparatus for forming image An image forming apparatus includes a light source that emits a laser beam, a separating unit that separates the laser beam emitted from the light source into a first laser beam, and a second laser beam. a first photoelectric converting unit, a second photoelectric ... | 03/06/2012 |
| 8120633 | Scanning optical apparatus, image forming apparatus, and control method A scanning optical apparatus includes, for example, a light source that outputs a light beam that has been pulse width modulated in accordance with input image data and a deflection unit that deflects the light beam so that the light beam scans the surface of an ima... | 02/21/2012 |
| 8111275 | System for optically adjusting an imaging head The present invention relates to a system for optically adjusting a computer-to-plate (CTP) imaging head which includes an a light source (104), optical fiber (124) for transmitting light emitted from the light source; an imaging lens (204) for ... | 02/07/2012 |
| 8063927 | Optical scanning apparatus and image-forming apparatus using the same An optical scanning apparatus includes a light source and a structure for performing light-power control for the light source, the structure including a light-power-detection optical unit that establishes an optically conjugate relationship between a deflecting surf... | 11/22/2011 |
| 7982760 | Optical scanning apparatus and technique for correcting optical characteristics in an image forming apparatus that employs an electrostatic recording method or an electrophotographic recording method An optical scanning apparatus controls an output of a light source for forming an electrostatic latent image on an image carrier. The optical scanning apparatus includes a correction amount control unit configured to variably control a light quantity correction amou... | 07/19/2011 |
| 7936367 | Image forming apparatus controlling the output level of the light source An image forming apparatus includes an optical scanning device that scans a scan area on an image carrier with light flux containing image information and writes the image information onto an image area in the scan area. In the optical scanning device, a first light... | 05/03/2011 |
| 7911491 | Apparatus and method for controlling power of laser diode having optical power compensation An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output volta... | 03/22/2011 |
| 7911492 | Line head and image forming apparatus incorporating the same At least one light emission array includes a plurality of light emitting elements arrayed in a first direction. Each of the light emitting elements is an organic electroluminescence element. A monitor quantitatively monitors a light emitting state of at least one of... | 03/22/2011 |
| 7839427 | Multi-beam image forming apparatus configured to perform droop correction A multi-beam image forming apparatus is disclosed in which a semiconductor laser array including plural semiconductor laser elements serves as an optical beam generation unit. The apparatus includes a printing ratio counting unit that counts printing ratios of the s... | 11/23/2010 |
| 7812853 | Device for setting up, adjusting and/or controlling an apparatus for processing printed products A device is provided for setting up, adjusting, and/or controlling an apparatus that cyclically processes printed products. The device includes a lighting unit having at least one light source directed toward a processing area of the apparatus. The light source is c... | 10/12/2010 |
| 7804514 | Light beam scanning apparatus and image forming apparatus An image forming apparatus is provided with a modulator producing a modulated signal of a pulse width decided on given image data and a driver driving an optical generator such as laser to generate a light beam. The image forming apparatus is further provided with a... | 09/28/2010 |
| 7804513 | Optical writing unit, image forming apparatus, process cartridge, and method of adjusting light intensity An optical writing unit includes a light-emitting-element array in which a plurality of light emitting elements is arranged and an optical system that guides light flux emitted from the light emitting elements as a light spot. A result of comparison of a property va... | 09/28/2010 |
| 7796151 | Method and apparatus for printing with reflectivity Aspects of the disclosure provide a method for improving performance of a raster output scanner (ROS) system with a reduced cost. The method can include identifying a current mirror facet of a motor polygon assembly (MPA) including multiple mirror facets that each m... | 09/14/2010 |
| 7791630 | Method of adjusting an exposure device for an electrophotographic printer and exposure device A method of adjusting an exposure device suited for an electrophotographic printer, the exposure device includes a plurality of light-emitting elements. The method includes the steps of energizing selected light-emitting elements according to a selection scheme, usi... | 09/07/2010 |
| 7791629 | Exposure device, printing apparatus employing an exposure device and method for adjusting a non-impact printing apparatus An exposure device for a non-impact printing apparatus which includes a plurality of light-emitting elements for forming images, a driver element for individually applying energy output levels to the light-emitting elements, lens for focusing the light emitted by th... | 09/07/2010 |
| 7733362 | Optical writing device and image forming apparatus A rotating deflection unit deflects a laser light emitted from a light-emitting element and performs a scanning with the laser light. A light-intensity detecting unit detects a light intensity of the laser light. A current control unit controls a current to be suppl... | 06/08/2010 |
| 7728862 | Optical scanning apparatus An optical scanning apparatus includes a plurality of light sources capable of emitting light. A detection unit detects a light quantity of the light emitted from the plurality of light sources. A control unit controls drive current of a light source designated as a... | 06/01/2010 |
| 7719559 | Image forming apparatus, optical scanning apparatus, and auto light power control method An image forming apparatus includes light source having multiple light-emitting portions, rotating polygonal mirror which deflects a beam that is emitted from light source, and photosensitive member which is exposed by beams in an image period that is included in on... | 05/18/2010 |
| 7626605 | Apparatus for and method of forming image using oscillation mirror As a scanning light beam which is scanning and traveling away from an effective image region moves passed the location of a sensor, a horizontal synchronizing signal Hsync is obtained as a first detection signal. A deflection mirror surface turns around, thereby rev... | 12/01/2009 |
| 7616225 | Exposure system and production method for exposure system The invention is directed to the provision of an exposure apparatus in which is stored an electric current value appropriately determined for supply to a light-emitting device, and a method for producing such an exposure apparatus. The production method according to... | 11/10/2009 |
| 7561176 | Laser power compensation in a scanning electrophotographic device Methods are provided for an EP device such as a laser printer or copier, to compensate for variations in scanning rate. At intervals during a scanning process, actual scanning rate is measured and compared to a basal scanning rate of the EP device. Adjustments in th... | 07/14/2009 |
| 7518626 | Light beam synchronization detector and printer In this light beam synchronization detector, an enable circuit 34 outputs a first control signal Se1 to an output circuit 35 when at least one of the absolute values of a voltage signal V1 from a first amplifier 31 and a voltage si... | 04/14/2009 |
| 7515166 | Line head and image forming apparatus using the same A line head includes a plurality of the light emitting element columns which has a main light emitting element column exposing a light amount necessary for exposure to an image carrier and an auxiliary light emitting element column exposing the image carrier so as t... | 04/07/2009 |
| 7466333 | Optical scanning apparatus and image-forming apparatus using the same An optical scanning apparatus includes a light source and a structure for performing light-power control for the light source, the structure including a light-power-detection optical unit that establishes an optically conjugate relationship between a deflecting surf... | 12/16/2008 |
| 7453484 | Image forming apparatus In a laser beam printer, even when an inexpensive CPU having low throughput capacity is used, stable power can be obtained by following a sudden change in temperature of a laser chip. A control unit sets a scanning cycle for performing the automatic power control ba... | 11/18/2008 |
| 7446793 | Image forming apparatus In the light amount correction in the main scanning direction, sets of correction values of black and cyan for which the reflection frequency of optical elements are equal to an even number of times are made common to each other (a correction value set—KC), and se... | 11/04/2008 |
| 7432944 | Illumination utilizing a plurality of light sources Illumination utilizing a plurality of light sources is disclosed. In one embodiment, an illumination level is set to result in a desired contrast level. Calculations are made to derive electrical current values for each of the plurality of light sources which will i... | 10/07/2008 |
| 7417659 | Exposure device, LED print head, and image forming apparatus having the exposure device and the LED print head A shape or position of a shielding member is set corresponding to an image focusing property of each rod lens element to prevent an MTF from deteriorating, to provide a clear exposure image, and to prevent a defective image such as having a vertical streak or the li... | 08/26/2008 |
| 7408567 | Light beam scanning apparatus and image forming apparatus An image forming apparatus is provided with a modulator producing a modulated signal of a pulse width decided on given image data and a driver driving an optical generator such as laser to generate a light beam. The image forming apparatus is further provided with a... | 08/05/2008 |
| 7405384 | Method and apparatus for intensity control of multiple light sources using source timing A method and apparatus for controlling light intensity from two or more light sources. A timing scheme is used to modulate the light sources. Light from the light sources is combined to form a beam and a photo-sensor senses the beam. In a time interval when only one... | 07/29/2008 |
| 7403214 | Systems and methods for adjusting the dynamic range of a scanning laser beam The dynamic range of an electrophotographic device may be shifted by calibrating a laser power of a laser source to operate within a first range of power levels during a laser power adjustment operation. At least one laser control parameter is modified after calibra... | 07/22/2008 |
| 7375740 | Method and apparatus for adjusting printbar uniformity In a printing system, a method is used for adjusting currents to LEDs in an LED printbar to achieve uniformity of the print. The line test pattern and halftone strips test pattern are printed. The test patterns are scanned. An LED line metric of each LED test patter... | 05/20/2008 |
| 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 |
| 7349003 | Method for determining a correction value for light-emitting parts in exposure apparatus The invention is directed to the provision of an exposure apparatus that can determine a correction value for each individual light-emitting part by employing a method that detects the amount of light corresponding to one particular light-emitting part from composit... | 03/25/2008 |
| 7328425 | Method and device for correcting SLM stamp image imperfections The invention relates to production and precision patterning of work pieces, including manufacture of photomask for photolithography and direct writing on other substrates, such as semiconductor substrates. In particular, it relates to applying corrections to patter... | 02/05/2008 |
