Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorHidenori Kanazawa
Life of this patent
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Abstract
In an image forming apparatus, a correction control unit of an image clock control unit controls the frequency of an image clock, so that the partial magnification of each position in an image region in which an image is formed is corrected in a main scanning direction that is a direction in which a laser beam scans a scanning region of one line. When controlling the frequency of the image clock, the correction control unit makes the change rate (the slope) that is a change amount of the image clock per unit time, be smaller in a non-image region being a region other than the image region, than the change rate in the image region.
Claims17
An image forming apparatus, comprising:
- a light source that emits a light beam for exposing a photosensitive member;
- a deflection unit that deflects the light beam emitted from the light source such that the light beam scans the photosensitive member;
- a generation unit that generates an image clock for controlling timings at which the light source emits light;
- and
- a control unit that controls a frequency of the image clock generated by the generation unit according to each position in an image region in which an image is formed in a main scanning direction that is a direction in which the light beam scans a scanning region of one line,
- wherein the control unit controls the frequency of the image clock in a non-image region that is a region other than the image region, and
- wherein a change rate of the frequency of the image clock per unit time in the non-image region is smaller than a change rate of the frequency of the image clock per unit time in the image region.
An image forming apparatus, comprising:
- a light source that emits a light beam for exposing a photosensitive member;
- a deflection unit that deflects the light beam emitted from the light source such that the light beam scans the photosensitive member;
- a generation unit that generates an image clock for controlling timings at which the light source emits light;
- and
- a control unit that controls a frequency of the image clock generated by the generation unit according to each position in an image region in which an image is formed in a main scanning direction that is a direction in which the light beam scans a scanning region of one line,
- wherein the control unit decides the frequency of the image clock in a non-image region being a region other than the image region, in accordance with the frequency of the image clock in the image region.
Dependencies are inferred from the claim text.