Electrophotographic photosensitive member, and process cartridge and electrophotographic apparatus employing the same
AssigneeCanon Kabushiki Kaisha
InventorsYosuke Morikawa, Hiroyuki Tanaka
Life of this patent
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Abstract
An electrophotographic photosensitive member is disclosed which has a photosensitive layer containing an organic charge-generating material and an organic charge-transporting material, and a surface layer containing electroconductive particles, and is charged electrically by a charging member placed in contact therewith. The photosensitive member has an electrostatic capacity of not less than 130 pF/cm2. Also, a process cartridge and an employing the photosensitive member are disclosed.
Claims14
A process cartridge comprising an electrophotographic photosensitive member having a support, a photosensitive layer containing an organic charge-generating material and an organic charge transporting material on the support, and a surface layer containing electroconductive particles on the photosensitive layer;
- and at least one of a charging member placed in contact with the electrophotographic photosensitive member for charging the electrophotographic member by application of a voltage, a development means, and a cleaning means integrated into one body, and being detached from the main body of an electrophotographic apparatus, wherein the electrophotographic photosensitive member has an electrostatic capacity of not less than 130 pF per cm2, and wherein a DC voltage (VDC) and an AC voltage are applied in superposition to the charging member, and the VDC, the peak-to-peak voltage (Vpp) of the AC voltage, the surface potential (VD) of the photosensitive member immediately after the charging, and the discharge initiation voltage (Vth) satisfy the equations below:
- |VDC−VD|≦200 (V)
- |Vpp|<2×|Vth|
- |Vpp/2|+|VDC|−|VD|<|Vth|.
An electrophotographic apparatus comprising an electrophotographic photosensitive member having a support, a photosensitive layer containing an organic charge-generating material and an organic charge transporting material on the support, and a surface layer containing electroconductive particles on the photosensitive layer;
- a charging member placed in contact with the electrophotographic photosensitive member for charging the electrophotographic photosensitive member by application of a voltage;
- a light exposure means, a development means, and an image transfer means, wherein the electrophotographic photosensitive member has an electrostatic capacity of not less than 130 pF per cm2 and wherein a DC voltage (VDC) and an AC voltage are applied in superposition to the charging member, and the VDC, the peak-to-peak voltage (Vpp) of the AC voltage, the surface potential (VD) of the photosensitive member immediately after the charging, and the discharge initiation voltage (Vth) satisfy the equations below:
- |VDC−VD|≦200 (V)
- |Vpp|<2×|Vth|
- |Vpp/2|+|VDC|−|VD|<|Vth|.
Dependencies are inferred from the claim text.