Electrophotographic apparatus and process cartridge
First Claim
Patent Images
1. An electrophotographic apparatus, comprising:
- an electrophotographic photosensitive member having a cylindrical shape;
a charging unit, which is arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, and is configured to charge the electrophotographic photosensitive member;
a cleaning unit, which is arranged in abutment against the electrophotographic photosensitive member, and is configured to clean a surface of the electrophotographic photosensitive member; and
a transferring unit configured to transfer a toner image onto a transfer material,the electrophotographic photosensitive member comprising a charge generating layer and a surface layer in this order,the electrophotographic photosensitive member satisfying Expression (1), Expression (2), and Expression (3);
L1<
L5<
L3
(1);
L1>
L2
(2); and
L1>
L4
(3),where L1 represents a width from a center of an image forming area in a longitudinal direction of the electrophotographic photosensitive member to an end of a charging area,L2 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a transferring area,L3 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a surface layer formed area in which the surface layer is formed,L4 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a charge generating layer formed area in which the charge generating layer is formed, andL5 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a cleaning area.
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Abstract
Provided is an electrophotographic apparatus, including an electrophotographic photosensitive member, a charging unit arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, a cleaning unit or a developing unit arranged in abutment against the electrophotographic photosensitive member, and a transferring unit.
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Citations
14 Claims
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1. An electrophotographic apparatus, comprising:
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an electrophotographic photosensitive member having a cylindrical shape; a charging unit, which is arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, and is configured to charge the electrophotographic photosensitive member; a cleaning unit, which is arranged in abutment against the electrophotographic photosensitive member, and is configured to clean a surface of the electrophotographic photosensitive member; and a transferring unit configured to transfer a toner image onto a transfer material, the electrophotographic photosensitive member comprising a charge generating layer and a surface layer in this order, the electrophotographic photosensitive member satisfying Expression (1), Expression (2), and Expression (3);
L1<
L5<
L3
(1);
L1>
L2
(2); and
L1>
L4
(3),where L1 represents a width from a center of an image forming area in a longitudinal direction of the electrophotographic photosensitive member to an end of a charging area, L2 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a transferring area, L3 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a surface layer formed area in which the surface layer is formed, L4 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a charge generating layer formed area in which the charge generating layer is formed, and L5 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a cleaning area. - View Dependent Claims (2, 3, 4, 5, 6, 9)
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7. An electrophotographic apparatus, comprising:
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an electrophotographic photosensitive member having a cylindrical shape; a charging unit, which is arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, and is configured to charge the electrophotographic photosensitive member; a developing unit, which is arranged in abutment against the electrophotographic photosensitive member, and is configured to develop a toner image on the electrophotographic photosensitive member; and a transferring unit configured to transfer the toner image onto a transfer material, the electrophotographic photosensitive member comprising a charge generating layer and a surface layer in this order, the electrophotographic photosensitive member satisfying Expression (1), Expression (2), and Expression (3);
L1<
L5<
L3
(1);
L1>
L2
(2); and
L1>
L4
(3),where L1 represents a width from a center of an image forming area in a longitudinal direction of the electrophotographic photosensitive member to an end of a charging area, L2 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a transferring area, L3 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a surface layer formed area in which the surface layer is formed, L4 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a charge generating layer formed area in which the charge generating layer is formed, and L5 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a developing area. - View Dependent Claims (8)
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10. A process cartridge, which is configured to be removably mounted to a main body of an electrophotographic apparatus, the process cartridge comprising:
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an electrophotographic photosensitive member having a cylindrical shape; a charging unit, which is arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, and is configured to charge the electrophotographic photosensitive member; and a cleaning unit, which is arranged in abutment against the electrophotographic photosensitive member, and is configured to clean a surface of the electrophotographic photosensitive member, the electrophotographic photosensitive member comprising a charge generating layer and a surface layer in this order, and having a transferring area to be opposed to a transferring unit configured to transfer a toner image onto a transfer material, the electrophotographic photosensitive member satisfying Expression (1), Expression (2), and Expression (3);
L1<
L5<
L3
(1);
L1>
L2
(2); and
L1>
L4
(3),where L1 represents a width from a center of an image forming area in a longitudinal direction of the electrophotographic photosensitive member to an end of a charging area, L2 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of the transferring area, L3 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a surface layer formed area in which the surface layer is formed, L4 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a charge generating layer formed area in which the charge generating layer is formed, and L5 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a cleaning area. - View Dependent Claims (11, 12, 13)
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14. A process cartridge, which is configured to be removably mounted to a main body of an electrophotographic apparatus, the process cartridge comprising:
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an electrophotographic photosensitive member having a cylindrical shape; a charging unit, which is arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, and is configured to charge the electrophotographic photosensitive member; and a developing unit, which is arranged in abutment against the electrophotographic photosensitive member, and is configured to develop a toner image on the electrophotographic photosensitive member, the electrophotographic photosensitive member comprising a charge generating layer and a surface layer in this order, and having a transferring area to be opposed to a transferring unit configured to transfer the toner image onto a transfer material, the electrophotographic photosensitive member satisfying Expression (1), Expression (2), and Expression (3);
L1<
L5<
L3
(1);
L1>
L2
(2); and
L1>
L4
(3),where L1 represents a width from a center of an image forming area in a longitudinal direction of the electrophotographic photosensitive member to an end of a charging area, L2 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of the transferring area, L3 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a surface layer formed area in which the surface layer is formed, L4 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a charge generating layer formed area in which the charge generating layer is formed, and L5 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a developing area.
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Specification