Exposure apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorYuichi Seki
Life of this patent
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Abstract
An exposure apparatus according to this invention uses both a first light source which outputs a light beam corresponding to a drive current corresponding to image information, and a second light source to irradiate the surface of a photosensitive drum with a plurality of light beams. The second laser light source irradiates the photosensitive drum with a laser beam in accordance with a drive current corresponding to a correction value according to which unevenness of potential characteristics due to unevenness of sensitivity of the surface of the photosensitive drum is reduced. The same region on the surface of the photosensitive drum is irradiated with laser beams which are output from the first and second laser light sources onto the photosensitive drum in superposition.
Claims16
An exposure apparatus comprising:
- a light source configured to emit a light beam exposing a photosensitive member;
- and
- a control unit configured to cause the light source to execute a first exposure operation exposing the photosensitive member with the light beam emitted from the light source in accordance with a drive current based on image information, and cause the light source to execute a second exposure operation exposing the photosensitive member with the light beam emitted from the light source in accordance with a corrected current based on a position on a surface of the photosensitive member.
An image forming apparatus comprising:
- a photosensitive member;
- a charging unit configured to charge a surface of the photosensitive member;
- an exposure apparatus configured to expose the surface of the photosensitive member with a light beam to form an electrostatic latent image on the surface of the photosensitive member;
- and
- a developing unit configured to develop the electrostatic latent image formed on the surface of the photosensitive member using a developing material to form, on the surface of the photosensitive member, an image to be transferred onto a printing material,
- the exposure apparatus comprising
- a light source configured to emit a light beam exposing the photosensitive member, and
- a control unit configured to cause the light source to execute a first exposure operation exposing the photosensitive member with the light beam emitted from the light source in accordance with a drive current based on image information, and cause the light source to execute a second exposure operation exposing the photosensitive member with the light beam emitted from the light source in accordance with a corrected current based on a position on a surface of the photosensitive member.
Dependencies are inferred from the claim text.