Image recording device and an image recording system
AssigneeRicoh Printing Systems, Ltd.
InventorsShinya Kobayashi, Kunio Satoh, Susumu Edo, Seiji Maruo, Takao Kumasaka, Atsushi Onose
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Abstract
A multi-beam image recording device is capable of recording high-quality high-resolution images without positional errors by exposing test patterns for measuring positional errors of beam spots of each laser beam in main and subsidiary scanning directions, calculating the positional errors of beam spots using a correcting device, controlling the quantity of exposure according to the result of calculation, and thus correcting the positional errors in main and subsidiary scanning directions.
Claims22
An image recording device equipped with a plurality of light sources and a photosensitive unit which is scanned by said light sources, said device comprising:
- an interference light quantity setting unit which sets the quantity of interference lights of a plurality of image signals corresponding to said light sources;
- an interference unit for causing interference by said image signals with said preset light-quantity component only;
- a delay time setting unit which sets delay times of a plurality of pixel clocks corresponding to said light sources;
- a delay unit which delays said pixel clocks by said preset time periods only;
- a memory unit which stores interference data output from said interference unit in synchronism with said pixel clocks and outputs said interference data in the order that they were written by delay data output from said delay unit;
- and
- a pulse-width modulating unit which modulates the pulse widths of interference data which is output from said memory unit.
An image recording device equipped with an engine unit consisting of a plurality of light sources and a photosensitive unit which is scanned by said light sources, comprising:
- a controller which generates a plurality of image signals and pixel clocks corresponding to said light sources, and
- a correction unit which corrects the quantity of exposure in said optical system of said engine unit according to said image signals and said pixel clocks generated by said controller and sends said correction information to said engine unit, wherein said correction unit comprises:
- an interference light quantity setting unit which sets a quantity of interference lights of a plurality of image signals corresponding to said light sources;
- an interference unit which causes interference by said image signals with said preset light-quantity component only;
- a delay time setting unit which sets delay times of a plurality of pixel clocks corresponding to said light sources;
- a delay unit which delays said pixel clocks by said preset time periods only;
- a memory unit which stores interference data output from said interference unit in synchronism with said pixel clocks and outputs said interference data in the order that they were written by delay data output from said delay unit;
- and
- a pulse-width modulating unit which modulates the pulse widths of interference data which is output from said memory unit.
An image recording device, comprising:
- an image recording unit equipped with a plurality of laser beams and a plurality of detectors which detect said laser beams;
- a beam detection signal controller which outputs beam detection position control signals to control scanning line pitches of laser beams according to a plurality of beam detection signals output from said image recording unit;
- and
- a controller which controls said image recording unit at least according to said beam detection position control signals.
Dependencies are inferred from the claim text.