Light amount control, optical writing, and image forming apparatuses having a plurality of drive-current setting units
AssigneeRicoh Company, Ltd.
InventorsToshio Ohide, Kenichi Ono
Life of this patent
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Abstract
A light-amount control apparatus for controlling an output light amount of light sources used for optical writing is disclosed. The apparatus includes one or more drive units for supplying a drive current to the light source; one or more drive-current setting units for determining an amount of the drive current provided to the light source from the drive unit; a light-amount detecting unit for detecting an output light from the light source; and outputting a voltage according to the detected light amount; and a processing unit for setting the drive current amount based on the detected value detected with the light-amount detecting unit.
Claims11
A light-amount control apparatus for controlling an output light amount of a plurality of light sources used for optical writing, comprising:
- a plurality of drive units, each of the drive units supplying a drive current to one of the plurality of light sources;
- a plurality of drive-current setting units, each of the drive-current setting units determining an amount of the drive current supplied to one of the plurality of light sources;
- a light-amount detecting unit for detecting an output light from each of the plurality of light sources individually, and outputting a voltage according to the detected light amount;
- and
- a processing unit for setting the drive current amount for each of the plurality of light sources based on the detected value detected with the light-amount detecting unit for each of the light sources.
Dependencies are inferred from the claim text.