Image writing apparatus and color image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorKoji Toyoda
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Abstract
The present invention provides a color image forming apparatus forming an image by using a plurality of image carriers, wherein at least one lens having identical optical characteristics and forming individual scanning optical systems which scan the individual image carriers with beams is formed by use of a plurality of cavities. When dividing the cavities into a plurality of groups in response to variations in the optical characteristics caused by cavity difference of the lenses formed with the plurality of cavities so that the relative differences in an optical parameters are within an allowable range, at least one lens of each scanning optical system is selected from the cavities of one of the plurality of groups.
Claims16
An image writing apparatus for forming an image on a plurality of image carriers by scanning the image carriers with a plurality of beams, comprising:
- lenses having identical optical characteristics, and forming individual scanning optical systems which scan the individual image carriers with beams, at least one of which is formed by use of a plurality of cavities, wherein, when dividing cavities into a plurality of groups according to variations in the optical characteristics caused by cavity difference of the lenses formed by said plurality of cavities so that relative differences in an optical parameter are within an allowable range, at least one lens of each scanning optical system is selected from cavities of one of the plurality of groups.
An image writing apparatus for forming an image on a plurality of image carriers by scanning the image carriers with a plurality of beams, comprising:
- lenses having identical optical characteristics, and forming individual scanning optical systems which scan the individual image carriers with beams, at least one of which is formed by use of a plurality of cavities, wherein, when dividing cavities into a plurality of groups according to variations in optical characteristics caused by cavity difference of the lenses formed by said plurality of cavities so that relative differences in optical parameter are within an allowable range, lenses used for an image writing apparatus are selected from cavities of one of said groups, and each of said plurality of groups has at least one cavity belonging to all the plurality of groups.
An image writing apparatus for forming an image on a plurality of image carriers by scanning the image carriers with a plurality of beams, comprising:
- lenses having identical optical characteristics, and forming individual scanning optical systems which scan the individual image carriers with beams, at least one of which is formed by use of a plurality of cavities, wherein said at least one lens used in the image writing apparatus is formed with cavities whose number lies within a range from two to n−1, when the number of said plurality of cavities is n (n≧3).
Dependencies are inferred from the claim text.