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Class 347/246 - Feedback of light for intensity control


Subclass of Class 347 - Incremental printing of symbolic information
Definition: Subject matter having a photo detector for detecting quantity
No. of patents: 196
Last issue date: 01/10/2012


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NumberTitleIssue Date
8094178Method and apparatus for forming image
In an image forming apparatus, a separating unit separates each laser beam into a first laser beam used for measuring light intensity and a second laser beam used for scanning a photosensitive element, a photoelectric converting unit measures a light intensity of ea...
01/10/2012
8081203Light-amount detecting device, light source device, optical scanning unit and image forming apparatus
A light-amount detecting device includes: a light source which emits a light beam; a branching optical element which divides the light beam emitted from the light source into a first light beam traveling in a predetermined direction and a second light beam traveling...
12/20/2011
8022976Laser power switching for alignment purposes in a laser printer
An apparatus for switching and controlling the intensity of a laser beam directed toward a beam detect sensor for an image forming device. A printing power reference signal and a beam detect power reference signal is selectively connected to a laser driver through a...
09/20/2011
7990409Image forming apparatus
Disclosed an image forming apparatus equipped with an exposure section including a plurality of LED elements, the apparatus forming an electrostatic latent image on a photosensitive body with the exposure section, the apparatus including: an RFID tag provided in the...
08/02/2011
7847812Focusing control method for reading/writing optical disc
A label pattern can be created on a label side of an optical disc under well focus control. An optical disc is first loaded in an optical disc drive with the label side thereof facing to an optical head of the optical disc drive. Then, the optical head is actuated a...
12/07/2010
7750934Image forming apparatus and control method thereof
An image forming apparatus is capable of controlling an exposure in accordance with sensitivity variations of a photosensitive body. An actual exposure position (Pr) sometimes precedes an exposure position (Pc) recognized based on the count val...
07/06/2010
7663659Image forming apparatus and control method therefor
An image forming apparatus forms an image by laser beams from a plurality of lasers. The image forming apparatus includes a light amount control circuit that detects displacement in a sub-scanning direction of the main scanning line of a laser beam from the predeter...
02/16/2010
7576765Methods and apparatus for detecting and optimizing laser mark quality on recording media
A method for detecting and optimizing the quality of a mark made by a laser on a recording medium, comprising (a) recording a test mark at a selected level of laser power and a selected speed of movement of the recording medium, (b) measuring at least one dimension ...
08/18/2009
7532228Method for setting laser power in optical disc drive
A method for setting a laser power of an optical disc drive is provided. To perform a label-printing operation on a label surface of an optical disc, an optical pickup unit is shifted to a control feature zone of the label surface, and a laser power operation is per...
05/12/2009
7432944Illumination 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
7408567Light 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
7405384Method 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
7403214Systems 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
7394479Pulsed laser printing
The present disclosure includes systems and techniques relating to pulse laser printing. In general, in one implementation, an apparatus includes: a laser operable to produce a pulsed printing beam; an optics assembly operable to focus and direct the pulsed printing...
07/01/2008
7342949Laser scanning device
A laser scanning device includes a semiconductor laser that emits a laser beam, a laser power detector that detects laser beam power of the semiconductor laser, a reference voltage generator that generates reference voltage for controlling the laser beam power of th...
03/11/2008
7342680Image reading apparatus
The present invention provides an image reading apparatus capable of reading images with a sufficiently wide dynamic range. An image reading apparatus of this invention has a light source, a reading section which generates image data based on light obtained from an ...
03/11/2008
7330203Compact multibeam laser light source and interleaving raster scan
An individually drivable array of single stripe laser diodes is proposed for imaging printing plates. An imaging optics is used to produce n image points which have a spatial interval l between adjacent points. An interleaving raster scan line method is indicated, w...
02/12/2008
7279667Image forming apparatus
An image forming apparatus includes an exposure unit, a developing unit and a transferring unit that transfers a visualized image of developer to an image recording medium. The exposure unit includes a light emitting unit, a detecting unit that detects a quantity of...
10/09/2007
7266308Light output control circuit
Using a switching signal from a coarse/fine switching and operation mode switching circuit, the width of change of a counter control value during power up is increased, and the width of change is reduced once a steady state is reached. In the steady state, the frequ...
09/04/2007
7256803Direct thermal printer
A direct thermal printer device that can be used in any application using thermal printers. A direct thermal printer creates images on thermally active medium by applying light energy or radiant thermal energy created by a thermal heat source to create the heat nece...
08/14/2007
7248280Laser scanner having reduced air currents
A method for improving the operation of an electrophotographic printer. The method includes providing an electrophotographic printer containing a laser scanning unit. A torsion oscillator for the laser scanning unit is enclosed in closed compartment. The closed comp...
07/24/2007
7242419Light quantity adjustment device and method and exposure apparatus
An adjustment quantity required for adjusting a quantity of light emission is computed based on an image density calculated from a measured quantity of light emission and sensitivity characteristics of an exposed photosensitive material to be exposed so that the ima...
07/10/2007
7239336Image exposing apparatus having a beam scanner
An image exposing apparatus forms an image on photosensitive material by the technique of exposing and forming an image through direct modulation of a semiconductor laser device. The exposing apparatus includes a beam scanning unit for scanning a beam emitted from a...
07/03/2007
7235767Circuit arrangement for controlling illuminating means
A circuit arrangement is disclosed for controlling an illuminating device, particularly light-emitting diodes, in a control device of a motor vehicle, comprised of at least one illuminating device, which is integrated in a switching circuit having a semiconductor co...
06/26/2007
7221464Image recording apparatus and test pattern for evaluating recorded image
The invention concerns an image recording apparatus suitable for forming a medical image that is used for a medical diagnosis, and a test pattern for evaluating a quality of the medical image. The image recording apparatus includes a printing section to either the m...
05/22/2007
7212557Semiconductor laser device and radiation image read-out method and apparatus
A semiconductor laser device produces a laser beam, which is adapted to be expanded into a linear laser beam for use as stimulating rays for an image read-out operation for reading out a radiation image having been stored on a stimulable phosphor sheet. The semicond...
05/01/2007
7206013Image recording apparatus, image forming method, and image forming apparatus
The image recording apparatus scans a heat mode recording material with a light beam modulated in accordance with image information, to thereby record an image on the heat mode recording material. The apparatus includes an unit for generating a modulated signal, an ...
04/17/2007
7193642Image quality detecting apparatus, image forming apparatus and method, and image quality controlling apparatus and method
An image quality detecting apparatus detects image quality based on a specified image pattern formed on an image carrier. This apparatus includes a light-emitting device that radiates a spotlight on the image carrier, a lens, a scanning unit that scans the image pat...
03/20/2007
7185815Device for controlling multiple types of electroluminescent devices
A controller for an electroluminescent device includes an internal electroluminescent device system configuration database that includes configuration data stored in the controller for multiple electroluminescent device systems. A processor executes instructions fro...
03/06/2007
7184106Dielectric reflector for amorphous silicon crystallization
A method of forming a liquid crystal display device includes forming an amorphous silicon layer over a substrate and forming a light reflecting layer only over a first portion of the amorphous silicon layer. The amorphous silicon layer is then irradiated with a lase...
02/27/2007
7154524Exposure apparatus including a controller configured to read electrical signals from an array of photoelectric converters
An exposure apparatus for exposing a substrate to a light pulse via a mask. The apparatus includes an array of photoelectric converters to detect the light pulse, and a read circuit to read electrical signals from the array. The read circuit reads electrical signals...
12/26/2006
7139012Image forming device having multiple laser beam sources
An image forming device employs a multi-laser beam system in which the light intensity of the second semiconductor laser is adjusted while simultaneously emitting laser beams from both the first and second semiconductor lasers. This configuration makes it possible t...
11/21/2006
7104623Fluid ejection system with photosensor activation of ejection element
A fluid ejection system includes a fluid ejection assembly including a plurality of photosensors and a first array of fluid ejection elements. Each of the fluid ejection elements is configured to cause fluid to be ejected when the fluid ejection element is activated...
09/12/2006
7093919Image formation device, process cartridge initializing method, and process cartridge initializing program
When a new process cartridge is detected, that new process cartridge is initialized. A flag that indicates initialization status of the new process cartridge is set and stored. When a new process cartridge is detected, the flag is set to indicate non-initialization,...
08/22/2006
7095430Image exposing apparatus and image exposing method
In an image exposing apparatus and an image exposing method, a deterioration of an image quality caused by stray light is suppressed, while both a sensitive level and a non-sensitive level are properly set in accordance with a type of photosensitive material. In the...
08/22/2006
7095693Optical disc device and control method using preceding sub-beam to detect a disc defect
The invention relates to an optical disc device and a control method for the optical disc device. The presence of defects on an optical disc is confirmed by, based on the result of detecting a return light corresponding to a sub-beam spot used for tracking control, ...
08/22/2006
7088381Image forming apparatus and method of controlling the image forming apparatus
A color image forming apparatus and laser pulse width adjustment method can shorten the time required for laser pulse width adjustment with low cost. In a color image forming apparatus in which a plurality of laser scanners scan and expose a plurality of photosensit...
08/08/2006
7057990Power control of laser diode in an optical recording/playback apparatus
A method and apparatus for controlling the power of a laser diode, which can prevent fluctuation in the laser power of the laser diode at a record/playback area of an optical disc. The apparatus for controlling the power of the laser diode includes a controller whic...
06/06/2006
7053919Optical disk apparatus of variable recording velocity with optimum power control
In an optical recording apparatus, a detecting section detects disk identification information of an optical disk for selecting a constant which relates to the detected disk identification information. A test OPC section performs test writing operation for OPC at a ...
05/30/2006
7053920Feedback control apparatus and method for an emissive printhead
The present invention uses an open loop feedback technique to control emissive pixels of a printhead of a printer. The open loop feedback technique involves integrating the light intensity of the emissive pixel over a predetermined period of time, averaging the inte...
05/30/2006
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