Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

• US 10,705,440 B2
• Filed: 05/30/2019
• Issued: 07/07/2020
• Est. Priority Date: 06/05/2018
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ueno, Takanori, Takizawa, Kumiko, Kuroiwa, Ikuyo, Shimada, Tsuyoshi, Kitamura, Wataru, Takeuchi, Eileen
• Primary Examiner(s): Lee, Susan S
• Application Number:
  US16/426,069
• Publication Number:
  US 20190369513A1
• Time in Patent Office: 404 Days
• CPC Class Codes: G03G 5/10 Bases for charge-receiving or other layers
• CPC Class Codes: G03G 5/14 Inert intermediate or cover layers for charge-receiving layers G03G5/04 takes precedence

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.

Claims

1. 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, whereinμ

m≤

a≤

500 μ

m 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 μ

m≤

Rzjis

Rsm≤

50 μ

m, 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.

2. The electrophotographic photosensitive member according to claim 1, wherein −

1.2≤

Rsk≤

−

0.2.

3. The electrophotographic photosensitive member according to claim 1, wherein

50 μ

m≤

a≤

400 μ

m,

1.0 μ

m≤

Rzji≤

1.5 μ

m and

30 μ

m≤

Rsm≤

40 μ

m.

4. 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

μ

m≤

a≤

500 μ

m 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 μ

m≤

Rzjis

Rsm≤

50 μ

m, 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.

5. 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

μ

m≤

a≤

500 μ

m 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 μ

m≤

Rzjis

Rsm≤

50 μ

m, 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.

6. The electrophotographic apparatus according to claim 5, wherein the charging units comprise a charging roller disposed so as to abut the electrophotographic photosensitive member, and

a charging unit for charging the electrophotographic photosensitive member by applying direct current voltage only.