Image forming apparatus and exposure apparatus
AssigneeCanon Kabushiki Kaisha
InventorsDAISUKE AKAGI, HIROTAKA SEKI
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Abstract
There is provided an image forming apparatus including: a photosensitive member that is driven to rotate; an exposure head that includes a plurality of light-emitting portions arranged at different positions in an axial direction of the photosensitive member, wherein each of pixels of an image corresponding to an output resolution of the image forming apparatus is formed by multiple light-emitting portions of the plurality of light-emitting portions, and a control unit configured to control the number of light-emitting portions to be driven to form each of the pixels of the image based on correction data.
Claims37
An image forming apparatus comprising:
- a photosensitive member that is driven to rotate;
- an exposure head that includes a plurality of light-emitting portions arranged at different positions in an axial direction of the photosensitive member, wherein each of pixels of an image corresponding to an output resolution of the image forming apparatus is formed by multiple light-emitting portions of the plurality of light-emitting portions;
- and
- a control unit configured to control a number of light-emitting portions of the plurality of light-emitting portions to be driven to form each of the pixels of the image based on correction data.
An organic electroluminescence-type exposure apparatus for an image forming apparatus, the exposure apparatus comprising:
- an exposure head having a plurality of light-emitting elements arranged two-dimensionally so as to include M rows (where M is an integer of 2 or more) in a circumferential direction of a photosensitive member and N columns (where N is an integer of 2 or more) in an axial direction of the photosensitive member, with any two neighboring light-emitting elements among M light-emitting elements in each column occupying ranges that overlap partially in the axial direction;
- and
- a light emission control unit configured to control light emission from the plurality of light-emitting elements of the exposure head such that a spot corresponding to each of pixel positions in input image data is formed on a surface of the photosensitive member, by the M light-emitting elements of a column corresponding to the pixel position successively emitting light while the photosensitive member rotates,
- wherein in a case where positional misalignment of an image formed by the exposure head in the axial direction is detected, the light emission control unit is configured to shift a pixel value set of the input image data corresponding to at least one row of the plurality of light-emitting elements of the exposure head in a direction which cancels out the detected positional misalignment to cause the plurality of light-emitting elements to emit light.
An organic electroluminescence-type exposure apparatus for an image forming apparatus, the exposure apparatus comprising:
- an exposure head having a plurality of light-emitting elements arranged two-dimensionally so as to include M rows (where M is an integer of 2 or more) in a circumferential direction of a photosensitive member and N columns (where N is an integer of 2 or more) in an axial direction of the photosensitive member, with any two neighboring light-emitting elements among M light-emitting elements in each column occupying ranges that overlap partially in the axial direction;
- and
- a light emission control unit configured to control light emission from the plurality of light-emitting elements of the exposure head such that a spot corresponding to each of pixel positions in input image data is formed on a surface of the photosensitive member, by the M light-emitting elements of a column corresponding to the pixel position successively emitting light while the photosensitive member rotates,
- wherein in a case where scaling error of an image formed by the exposure head in the axial direction is detected, the light emission control unit is configured to insert or thin out a pixel value, at each of one or more pixel positions selected from pixel positions constituting the input image data depending on an error scale, into or from a pixel value set of a row to which each of the pixel positions belong to cause the plurality of light-emitting elements to emit light.
Dependencies are inferred from the claim text.