Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKOJI TAKAHASHI, MOTOYA YAMADA, SHUBUN KUJIRAI
Life of this patent
Estimating the term…
Abstract
An electrophotographic photosensitive member comprising a support, an electroconductive layer, an undercoat layer, a charge generating layer, and a hole transporting layer in this order, wherein when an ionization potential of the electroconductive layer is defined as IPc, the IPc is 5.4 to 5.8 eV, and when an ionization potential of the undercoat layer is defined as IPu, the IPu is 6.0 eV or more, wherein the undercoat layer comprises an electron transporting compound and a compound (α), and when an ionization potential of the compound (α) is defined as IPα, the IPc, the IPu, and the IPα satisfy relation (1): IPu−IPc>IPα−IPc (1).
Claims20
An electrophotographic photosensitive member comprising a support, an electroconductive layer, an undercoat layer, a charge generating layer, and a hole transporting layer, in this order, wherein
- when an ionization potential of the electroconductive layer is defined as IPc, the IPc is 5.4 to 5.8 eV, and
- when an ionization potential of the undercoat layer is defined as IPu, the IPu is 6.0 eV or more, and
- the undercoat layer comprises an electron transporting compound and a compound (α), and when an ionization potential of the compound (α) is defined as IPα, the IPc, the IPu and the IPα satisfy relation (1):
- IPu−IPc>IPα−IPc (1).
An electrophotographic photosensitive member comprising a support, an electroconductive layer, an undercoat layer, a charge generating layer, and a hole transporting layer, in this order, wherein
- when an ionization potential of the electroconductive layer is defined as IPc, the IPc is 5.4 to 5.8 eV, and
- when an ionization potential of the undercoat layer is defined as IPu, the IPu is 6.0 eV or more, and
- the undercoat layer is formed by copolymerization of a compound (β) with an electron transporting compound, and
- when an ionization potential of the compound (β) is defined as IPβ, the IPc, the IPu and the IPβ satisfy relation (2):
- IPu−IPc>IPβ−IPc (2).
A process cartridge integrally supports an electrophotographic photosensitive member comprising a support, an electroconductive layer, an undercoat layer, a charge generating layer, and a hole transporting layer, in this order, and at least one unit selected from a group consisting of a charging unit, a developing unit and a cleaning unit, and is detachable from a main body of an electrophotographic apparatus, wherein
- when an ionization potential of the electroconductive layer is defined as IPc, the IPc is 5.4 to 5.8 eV, and
- when an ionization potential of the undercoat layer is defined as IPu, the IPu is 6.0 eV or more, and
- the undercoat layer comprises an electron transporting compound and a compound (α), and
- when an ionization potential of the compound (α) is defined as IPα, the IPc, the IPu and the IPα satisfy relation (1):
- IPu−IPc>IPα−IPc (1).
A process cartridge integrally supports an electrophotographic photosensitive member comprising a support, an electroconductive layer, an undercoat layer, a charge generating layer, and a hole transporting layer, in this order, and at least one unit selected from a group consisting of a charging unit, a developing unit and a cleaning unit, and is detachable from a main body of an electrophotographic apparatus, wherein
- when an ionization potential of the electroconductive layer is defined as IPc, the IPc is 5.4 to 5.8 eV, and
- when an ionization potential of the undercoat layer is defined as IPu, the IPu is 6.0 eV or more, and
- the undercoat layer is formed by copolymerization of a compound (β) with an electron transporting compound, and
- when an ionization potential of the compound (β) is defined as IPβ, the IPc, the IPu and the IPβ satisfy relation (2):
- IPu−IPc>IPβ−IPc (2).
An electrophotographic apparatus comprising an electrophotographic photosensitive member comprising a support, an electroconductive layer, an undercoat layer, a charge generating layer, and a hole transporting layer, in this order, and a charging unit, an exposure unit, a development unit and a transfer unit, wherein
- when an ionization potential of the electroconductive layer is defined as IPc, the IPc is 5.4 to 5.8 eV, and
- when an ionization potential of the undercoat layer is defined as IPu, the IPu is 6.0 eV or more, and
- the undercoat layer comprises an electron transporting compound and a compound (α), and
- when an ionization potential of the compound (α) is defined as IPα, the IPc, the IPu and the IPα satisfy relation (1):
- IPu−IPc>IPα−IPc (1).
An electrophotographic apparatus comprising an electrophotographic photosensitive member comprising a support, an electroconductive layer, an undercoat layer, a charge generating layer, and a hole transporting layer, in this order, and a charging unit, an exposure unit, a development unit and a transfer unit, wherein
- when an ionization potential of the electroconductive layer is defined as IPc, the IPc is 5.4 to 5.8 eV, and
- when an ionization potential of the undercoat layer is defined as IPu, the IPu is 6.0 eV or more, and
- the undercoat layer is formed by copolymerization of a compound (β) with an electron transporting compound, and
- when an ionization potential of the compound (β) is defined as IPβ, the IPc, the IPu and the IPβ satisfy relation (2):
- IPu−IPc>IPβ−IPc (2).
Dependencies are inferred from the claim text.