Electrophotographic photosensitive member, process cartridge, and image forming apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorsYuko Iwashita, Kazunari Hamasaki, Kazutaka Sugimoto
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Abstract
An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. An optical response time is at least 0.05 milliseconds and no greater than 0.85 milliseconds. The binder resin includes a polycarbonate resin including a repeating unit represented by general formula (1) shown below and a repeating unit represented by general formula (2) shown below.
Claims11
An electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer of a single layer, wherein
- the photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin,
- an optical response time is at least 0.05 milliseconds and no greater than 0.85 milliseconds,
- the optical response time is a time from irradiation to decay, the irradiation being a time of a start of irradiation of a surface of the photosensitive layer charged to +800 V with pulse light having a wavelength of 780 nm, the decay being a time when a surface potential of the photosensitive layer decays from +800 V to +400 V,
- an optical intensity of the pulse light is set so that the surface potential of the photosensitive layer becomes +200 V from +800 V when 400 milliseconds elapse after the irradiation of the surface of the photosensitive layer charged to +800 V with the pulse light,
- the binder resin includes a polycarbonate resin including a repeating unit represented by a general formula (1) shown below and a repeating unit represented by a general formula (2) shown below, and
- the hole transport material is a compound represented by a chemical formula (16-HT7), (17-HT19), or (18-HT21) shown below,
- where in the general formula (1),
- R1, R2, R3, and R4 each represent, independently of one another, a hydrogen atom, an alkyl group having a carbon number of at least 1 and no greater than 3 and optionally substituted by a halogen atom, or an aryl group having a carbon number of at least 6 and no greater than 14, and
- R3 and R4 may be bonded together to form a ring of a divalent group represented by a general formula (X) shown below,
- in the general formula (2),
- R5 and R6 each represent, independently of each other, a hydrogen atom or an alkyl group having a carbon number of at least 1 and no greater than 3 and optionally substituted by a substituent, and
- W represents a single bond, —O—, or —CO—,
- where in the general formula (X),
- t represents an integer of at least 1 and no greater than 3, and
- * represents a bond,
Dependencies are inferred from the claim text.