Scanning optical apparatus, image forming apparatus, and control method
AssigneeCanon Kabushiki Kaisha
InventorKatsuhide Koga
Life of this patent
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Abstract
A scanning optical apparatus includes, for example, a light source that outputs a light beam that has been pulse width modulated in accordance with input image data and a deflection unit that deflects the light beam so that the light beam scans the surface of an image carrier in the main scanning direction. The scanning optical apparatus furthermore includes a correction unit that corrects the pulse width and light amount applied to the light beam at each scanning position in the main scanning direction on the image carrier in accordance with focus error in the light beam at each scanning position.
Claims11
A scanning optical apparatus, comprising:
- a light source that outputs a light beam that has been pulse width modulated in accordance with inputted image data;
- a deflection unit that deflects the light beam so that the light beam scans the surface of an image carrier in the main scanning direction;
- and
- a correction unit that corrects the pulse width and light amount applied to the light beam at each scanning position in the main scanning direction on the image carrier in accordance with focus error in the light beam at each scanning position.
A control method for a scanning optical apparatus provided with a light source that outputs a light beam that has been pulse width modulated in accordance with inputted image data and a deflection unit that deflects the light beam so that the light beam scans the surface of an image carrier in the main scanning direction, the method comprising a step of:
- correcting the pulse width and light amount applied to the light beam at each scanning position in the main scanning direction on the image carrier in accordance with focus error in the light beam at each scanning position.
Dependencies are inferred from the claim text.