Image forming apparatus for forming image using plurality of exposure heads
AssigneeCanon Kabushiki Kaisha
InventorJunichi Goda
Life of this patent
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Abstract
A first exposure head forms an image corresponding to a first color based on a first synchronization signal. A second exposure head forms the image corresponding to a second color based on a second synchronization signal. A period of the first synchronization signal in a case where the first exposure head is to form the image for a second surface of a sheet is shorter than a period of first synchronization signal in a case where the first exposure head is to form the image for a first surface of the sheet. A period of the second synchronization signal in a case where the second exposure head is to form the image for the second surface is shorter than a period of the second synchronization signal in a case where the second exposure head is to form the image for the first surface.
Claims13
An image forming apparatus comprising:
- a first photosensitive drum configured to be rotationally driven;
- a first exposure head including a first plurality of light-emitting portions arranged in a direction along an axis of rotation of the first photosensitive drum, and configured to form an image corresponding to a first color on a surface of the first photosensitive drum by light emitted from the first plurality of light-emitting portions;
- a second photosensitive drum configured to be rotationally driven;
- a second exposure head including a second plurality of light-emitting portions arranged in a direction along an axis of rotation of the second photosensitive drum, and configured to form an image corresponding to a second color on a surface of the second photosensitive drum by light emitted from the second plurality of light-emitting portions;
- and
- at least one processor configured to:
- (1) generate a first synchronization signal at a cycle in which the surface of the first photosensitive drum moves by a size of one pixel in the image corresponding to the first color in a direction of rotation of the first photosensitive drum;
- (2) generate a second synchronization signal at a cycle in which the surface of the second photosensitive drum moves by the size of one pixel in the image corresponding to the second color in a direction of rotation of the second photosensitive drum;
- and
- (3) cause the first exposure head to form one line of the image corresponding to the first color along the axis of rotation of the first photosensitive drum based on the first synchronization signal, and cause the second exposure head to form one line of the image corresponding to the second color along the axis of rotation of the second photosensitive drum based on the second synchronization signal.
Dependencies are inferred from the claim text.