Optical writing device, image forming apparatus, and optical writing method
AssigneeRicoh Company, Ltd.
InventorToshio Ohide
Life of this patent
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Abstract
An optical writing device includes two or more light sources. The two or more light sources can be driven independently, are placed away from each other in a sub-scanning direction of a photoreceptor, and each distance of beams emitted from the light sources to the photoreceptor is different. A phase control unit causes a difference in phase among timing control data of two or more beams emitted from the two or more light sources by a phase change amount, which is determined on the basis of beam position of the each beam on the photoreceptor in a main scanning direction and varies depending on the beam position. The modulating unit modulates the timing control data of the respective phase-controlled beams by a same clock.
Claims13
An optical writing device comprising:
- two or more light sources that can be driven independently and are placed away from each other in a sub-scanning direction of a photoreceptor, wherein
- each distance of beams emitted from the light sources to the photoreceptor is different;
- a phase control unit that causes a difference in phase among timing control data of two or more beams emitted from the two or more light sources by a phase change amount,
- wherein the phase change amount is an amount determined on the basis of beam position of the each beam on the photoreceptor in a main scanning direction and varies depending on the beam position;
- and
- a modulating unit that modulates the timing control data of the respective beams phase-controlled by the phase control unit by using a same clock.
An image forming apparatus comprising:
- two or more light sources that can be driven independently and are placed away from each other in a sub-scanning direction of a photoreceptor, wherein
- each distance of beams emitted from the light sources to the photoreceptor is different;
- a phase control unit that causes a difference in phase among timing control data of two or more beams emitted from the two or more light sources by a phase change amount, wherein the phase change amount is an amount determined on the basis of beam position of each beam on the photoreceptor in a main scanning direction and varies depending on the beam position;
- and
- a modulating unit that modulates the timing control data of the respective beams phase-controlled by the phase control unit by using a same clock.
An optical writing method of an optical writing device that includes two or more light sources, wherein the two or more light sources can be driven independently, and are placed away from each other in a sub-scanning direction of a photoreceptor, and each distance of beams emitted from the two or more light sources to the photoreceptor is different, the optical writing method comprising:
- a phase control step of causing a difference in phase among timing control data of two or more beams emitted from the two or more light sources by a phase change amount that is determined on the basis of beam position of the each beam on the photoreceptor in a main scanning direction and varies depending on the beam position;
- and
- a modulating step of modulating each of the timing control data of the respective beams phase-controlled at the phase control step by using a same clock.
A computer program product comprising a non-transitory computer-readable medium having computer-readable program codes embodied in the medium for an optical writing of an optical writing device that includes two or more light sources, wherein the two or more light sources can be driven independently, and are placed away from each other in a sub-scanning direction of a photoreceptor, and each distance of beams emitted from the two or more light sources to the photoreceptor is different, the program codes when executed causing a computer to execute:
- a phase control step of causing a difference in phase among timing control data of two or more beams emitted from the two or more light sources by a phase change amount that is determined on the basis of beam position of the each beam on the photoreceptor in a main scanning direction and that varies depending on the beam position;
- and
- a modulating unit step of modulating each of the timing control data of the respective beams phase-controlled at the phase control step by using a same clock.
Dependencies are inferred from the claim text.