| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 347236000 | Feed back of light for intensity control | 11 |
| 20080291259 | LIGHT SOURCE DRIVING DEVICE, LIGHT SCANNING DEVICE AND IMAGE FORMING APPARATUS - A light source driving device which drives a plurality of light emitting parts provided in a light source to emit a plurality of light beams based on image information, includes a plurality of driving circuits configured to drive the plurality of light emitting parts. Each of the driving circuits includes a signal generation circuit that generates a modulation signal to control a light emitting intensity of the corresponding light emitting part based on the image information, a detection circuit that detects a light emitting status of the corresponding light emitting part; and a light emitting circuit that outputs a driving signal to the corresponding light emitting part to emit a light beam in accordance with the modulation signal and adjustment data obtained based on the light emitting status of at least one of the plurality of light emitting parts. | 11-27-2008 |
| 20090021571 | Line Head And An Image Forming Apparatus Using The Line Head - A line head, includes: a substrate which is transmissive and includes a first surface and a second surface facing the first surface; a plurality of light emitting elements which are arranged on the first surface of the substrate and emit light beams; a wiring which is arranged on the first surface of the substrate and is connected with the plurality of light emitting elements; a lens array that includes a plurality of imaging lenses which are arranged facing the light emitting elements at a side of the second surface of the substrate and focus the light beams emitted from the facing light emitting elements to form spots; and an optical sensor which detects the light beams emitted from the light emitting elements and is arranged on the second surface of the substrate. | 01-22-2009 |
| 20090079810 | 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 surface of a deflecting unit and a light-receiving surface of a light-power detector in a main-scanning plane. Accordingly, the storage time of a light beam on the light-power-detection optical unit is increased and variation in the power of light emitted by the light source due to heat generated by the light source and environmental variation is accurately detected. | 03-26-2009 |
| 20090185024 | IMAGE FORMING APPARATUS, CONTROL METHOD THEREFOR, AND PROGRAM - The image densities of images formed with a plurality of laser beams on the basis of image data are measured. The quantity of each of the plurality of laser beams is adjusted in accordance with the measurement result. | 07-23-2009 |
| 20100091081 | ADAPTIVE CORRECTION SYSTEM - Adaptive correction techniques are disclosed that adaptively correct aberrations which may arise in systems such as laser printers, for example. For laser printers, calibration data processing results may be detected by a detector that is disposed to correspond physically to the recording medium so that characteristics such as position and intensity of a laser beam at the detector corresponds to that of a laser beam at the recording medium. In this way, aberrations in system performance may be adaptively corrected while the system is performing operational processes. | 04-15-2010 |
| 20100328416 | LIGHT EMITTING DEVICE, PRINT HEAD, IMAGE FORMING APPARATUS, LIGHT AMOUNT CORRECTION METHOD OF PRINT HEAD AND COMPUTER READABLE MEDIUM - A light emitting device is provided with: a self-scanning light emitting element array that includes light emitting elements divided into plural groups, light-controlled for each of the groups, and arrayed in line; and a light-up controller that sets any one of a voltage and a current for light-up, in accordance with the number of light emitting elements intended to light up in each of the groups. | 12-30-2010 |
| 20110043592 | OPTICAL WRITING DEVICE, IMAGE FORMING APPARATUS, METHOD OF CONTROLLING OPTICAL WRITING DEVICE, AND COMPUTER PROGRAM PRODUCT - An optical writing device includes: a light source including arrays arranged in a main scanning direction, each array including light-emitting elements arranged in the main scanning direction; a correction-value holding unit to hold, correspondingly with a light-emitting element, a correction value for changing timing to read out pixel data stored in an image storage unit; and a light-source drive unit to drive the light source by reading out the stored pixel data stored, according to the correction value. The correction-value holding unit includes a first area for holding a first correction value corresponding to a first light-emitting element located at an end of an array and a second area for holding a second correction value corresponding to a second light-emitting element other than the first light-emitting element, the first holding area being larger than the second holding area. | 02-24-2011 |
| 20120069128 | OPTICAL DEVICE, CONTROL METHOD OF OPTICAL DEVICE, AND IMAGE FORMING APPARATUS - An optical device includes: an irradiation unit that irradiates a part of laser beams output from a light source as a scan beam onto an irradiation target and outputs the remaining part of the laser beams as a monitor beam used to monitor a light amount of the laser beams; a measurement unit that measures a light amount of the monitor beam; a storage unit that stores a plurality of measurement results obtained by the measurement unit when the laser beams are output in a plurality of different light amounts, and the plurality of the different light amounts associated with each other; and a prediction unit that predicts the light amount of the monitor beam relative to a reference light amount of the laser beam using a plurality of the light amounts stored in the storage unit and the measurement results corresponding to the plurality of the light amounts. | 03-22-2012 |
| 20120140014 | DEVICE AND METHOD FOR EXTENDING LIGHT EMITTING DIODE PRINTBAR LIFE OR IMPROVING IMAGE QUALITY - A device including: a photoreceptor; an LED printbar; and a computer processor for: determining how long LEDs on the printbar are energized while the device is operated to generate an image output; determining that a first plurality of LEDs has been energized less than a second plurality of LEDs; energizing the first plurality of LEDs for a correction time period as the LEDs are aligned with an inter-document zone (IDZ); and de-energizing the second plurality of LEDs during the time period. Energizing the second plurality of LEDs is unrelated to energizing the LEDs for purposes of evaluating an image. The time period is concurrent with operation of the device to generate an image output. | 06-07-2012 |
| 20130127975 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus that performs a shading correction includes a light source that emits a light beam; a light-source drive unit that drives the light source; and a light-quantity-adjustment-amount control unit that performs an adjustment of a light quantity in accordance with a shading correction curve by controlling, for the light-source drive unit, a light-quantity adjustment amount and an increase/decrease cycle of the light-quantity adjustment amount. The increase/decrease cycle is a unit of time within a time period during which the light-quantity adjustment amount increases or, decreases. | 05-23-2013 |
| 20140192131 | IMAGE FORMING DEVICE - An image forming device includes a photoreceptor drum including a target surface that is scanned in a main scanning direction and a sub-scanning direction, an exposure head including a plurality of light emitting segments aligned in parallel to the main scanning direction, an exposure driving unit which selectively drives the plural light emitting segments, a storing unit which stores a profile where the respective positions of the plural light emitting segments correspond to a correction amount from the main scanning direction toward the sub-scanning direction at every position, and a correcting unit which smoothes a local change of the correction amount in the profile. | 07-10-2014 |
