Electrophotographic apparatus, process cartridge, and electrophotographic photosensitive member
AssigneeCanon Kabushiki Kaisha
InventorKazumi Yamauchi
Life of this patent
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Abstract
An electrophotographic apparatus is provided having an electrophotographic photosensitive member and an exposure device for forming a static latent image on the electrophotographic photosensitive member surface by scanning with an exposure beam based on an image information. The spot diameter of the exposure beam is 2.5 times or more the size of one pixel of an image picture formed by the electrophotographic apparatus. The electrophotographic photosensitive member has the Fischer hardness of 240 Ns/mm2 or more in its surface, and the NESA sensitivity of 2000 V·cm2/μJ or more, and is provided with an electric charge generating layer and an electric charge transportation layer 30 μm or less thick.
Claims15
An electrophotographic apparatus comprising an electrophotographic photosensitive member and exposure means for forming a static latent image on the surface of the electrophotographic photosensitive member by scanning with an exposure beam based on picture information,
- the spot diameter of the exposure beam being 2.5 times or more the size of one pixel of an image formed by the electrophotographic apparatus,
- wherein a Fischer hardness of the surface of the electrophotographic photosensitive member is no less than 240 Ns/mm2,
- a NESA sensitivity of the electrophotographic photosensitive member is no less than 2000 V·cm2/μJ,
- the electrophotographic photosensitive member comprises at least an electric charge generating layer and an electric charge transportation layer, and
- a thickness of the electric charge transportation layer is no more than 30 μm.
A process cartridge which supports as one unit an electrophotographic photosensitive member in which a static latent image is formed on its surface by scanning with an exposure beam from exposure means based on image information, and at least one means selected from the group consisting of developing means, cleaning means and charging means, and can be mounted on, and detached from, a main body of an electrophotographic apparatus, wherein
- a spot diameter of the exposure beam is 2.5 times or more the size of one pixel of an image formed by the electrophotographic apparatus,
- a Fischer hardness of the surface of the electrophotographic photosensitive member is no less than 240 Ns/mm2,
- a NESA sensitivity of the electrophotographic photosensitive member is no less than 2000 V·cm2/μJ,
- the electrophotographic photosensitive member comprises at least an electric charge generating layer and an electric charge transportation layer, and
- a thickness of said electric charge transportation layer is no more than 30 μm.
An electrophotographic photosensitive member in which a static latent image is formed on its surface by scanning with an exposure beam from exposure means based on image information, wherein
- a spot diameter of the exposure beam is 2.5 times or more the size of one pixel of an image formed using the electrophotographic photosensitive member,
- a Fischer hardness of the surface of the electrophotographic photosensitive member is no less than 240 Ns/mm2,
- a NESA sensitivity of the electrophotographic photosensitive member is no less than 2000 V·cm2/μJ,
- the electrophotographic photosensitive member comprises at least an electric charge generating layer and an electric charge transportation layer, and
- a thickness of said electric charge transportation layer is no more than 30 μm.
Dependencies are inferred from the claim text.