Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTakanori Ueno, Kumiko Takizawa, Ikuyo Kuroiwa, Tsuyoshi Shimada, Wataru Kitamura, Eileen Takeuchi
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Abstract
Provided is an electrophotographic photosensitive member that can suppress the generation of both an interference fringe and a streaky uneven part in a circumferential direction on an image. The generation of the interference fringe and the generation of the streaky uneven part in the circumferential direction on the image are suppressed by defining a length of a line-shaped groove of a support in a circumferential direction, and defining roughness parameters of a support in an axial direction.
Claims6
An electrophotographic photosensitive member comprising a cylindrical support, an undercoat layer and a photosensitive layer in this order, a surface of the support comprising a line-shaped groove in a circumferential direction of the support, wherein
- 50 μm≤a≤500 μm when a represents a length of the line-shaped groove in the circumferential direction, with regard to 90% or more of the line-shaped groove based on the entirety thereof,
- 0.7 μm≤Rzjis
- Rsm≤50 μm, and
- −4.0≤Rsk≤−0.2
- where Rzjis is a ten-point average roughness, Rsm is an average length of a roughness profile element and Rsk is a skewness according to JIS B 0601:2001 obtained from a roughness profile in an axial direction of the surface of the support.
A process cartridge supporting an electrophotographic photosensitive member comprising a cylindrical support, an undercoat layer and a photosensitive layer in this order and at least one unit selected from the group consisting of a charging unit, a developing unit, a transfer unit and a cleaning unit, and being detachably attachable to a body of an electrophotographic apparatus,
- a surface of the support of the electrophotographic photosensitive member comprises a line-shaped groove in a circumferential direction of the support, wherein
- 50 μm≤a≤500 μm when a represents a length of the line-shaped groove in the circumferential direction, with regard to 90% or more of the line-shaped groove based on the entirety thereof,
- 0.7 μm≤Rzjis
- Rsm≤50 μm, and
- −4.0≤Rsk≤−0.2
- where Rzjis is a ten-point average roughness, Rsm is an average length of a roughness profile element and Rsk is a skewness according to JIS B 0601:2001 obtained from a roughness profile in an axial direction of the surface of the support.
An electrophotographic apparatus comprising an electrophotographic photosensitive member comprising a cylindrical support, an undercoat layer and a photosensitive layer in this order, a charging unit, an exposure unit, a developing unit and a transfer unit,
- a surface of the support of the electrophotographic photosensitive member comprising a line-shaped groove in a circumferential direction of the support, wherein
- 50 μm≤a≤500 μm when a represents a length of the line-shaped groove in the circumferential direction, with regard to 90% or more of the line-shaped groove based on the entirety thereof,
- 0.7 μm≤Rzjis
- Rsm≤50 μm, and
- −4.0≤Rsk≤−0.2
- where Rzjis is a ten-point average roughness, Rsm is an average length of a roughness profile element and Rsk is a skewness according to JIS B 0601:2001 obtained from a roughness profile in an axial direction of the surface of the support.
Dependencies are inferred from the claim text.