Electrophotographic photoreceptor, process cartridge, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-2020096886-A1
Application number	US-201916262943-A
Country	US
Kind code	A1
Filing date	Jan 31, 2019
Priority date	Sep 26, 2018
Publication date	Mar 26, 2020
Grant date	—

Abstract

An electrophotographic photoreceptor includes a conductive substrate having a surface, an undercoat layer disposed on the surface of the conductive substrate, and a photosensitive layer on the undercoat layer. A maximum height waviness of a waviness profile of the surface of the conductive substrate on which the undercoat layer is disposed is 1.4 μm or less, and the undercoat layer contains a binder resin and has a thickness non-uniformity of 0.4 μm or less.

First claim

What is claimed is:

1 . An electrophotographic photoreceptor comprising:
a conductive substrate having a surface; an undercoat layer disposed on the surface of the conductive substrate; and a photosensitive layer on the undercoat layer, wherein a maximum height waviness of a waviness profile of the surface of the conductive substrate on which the undercoat layer is disposed is 1.4 μm or less, and the undercoat layer contains a binder resin and has a thickness non-uniformity of 0.4 μm or less.

2 . The electrophotographic photoreceptor according to claim 1 , wherein a mean width of the waviness profile of the surface of the conductive substrate on which the undercoat layer is disposed is 0.5 mm or more.

3 . The electrophotographic photoreceptor according to claim 1 , wherein a mean width of the waviness profile of the surface of the conductive substrate on which the undercoat layer is disposed is 0.6 mm or more.

4 . The electrophotographic photoreceptor according to claim 2 , wherein the mean width of the waviness profile of the surface of the conductive substrate on which the undercoat layer is disposed is 20 mm or less.

5 . The electrophotographic photoreceptor according to claim 1 , wherein the undercoat layer includes metal oxide particles.

6 . The electrophotographic photoreceptor according to claim 5 , wherein the metal oxide particles are at least one type of metal oxide particles selected from the group consisting of zinc oxide particles, titanium oxide particles, and tin oxide particles.

7 . The electrophotographic photoreceptor according to claim 6 , wherein the metal oxide particles are zinc oxide particles.

8 . The electrophotographic photoreceptor according to claim 5 , wherein an amount of the metal oxide particles contained relative to the undercoat layer is 10 mass % or more and 80 mass % or less.

9 . The electrophotographic photoreceptor according to claim 1 , wherein the binder resin is at least one selected from the group consisting of a phenolic resin, a melamine resin, a guanamine resin, and a urethane resin.

10 . A process cartridge detachable from and attachable to an image forming apparatus, the process cartridge comprising the electrophotographic photoreceptor according to claim 1 , but not comprising a charge erasing unit that erases charges on a surface of the electrophotographic photoreceptor.

11 . An image forming apparatus comprising:
at least two image forming units arranged side-by-side in a direction in which a transfer-receiving member travels, the image forming units each including
the electrophotographic photoreceptor according to claim 1 ,
a charging unit that charges a surface of the electrophotographic photoreceptor by a charging method involving applying a DC voltage,
an electrostatic latent image forming unit that forms an electrostatic latent image on the charged surface of the electrophotographic photoreceptor, and
a developing unit that develops the electrostatic latent image on the surface of the electrophotographic photoreceptor by using a developer containing a toner so as to form a toner image,
but not including a charge erasing unit that erases charges on the surface of the electrophotographic photoreceptor; and a transfer unit that transfers the toner image onto a surface of the transfer-receiving member.

Assignees

• Fuji Xerox Co Ltd

Inventors

• Sasaki Takaakira
• Yamashita Takayuki

Classifications

• G03G5/10 Primary

  Bases for charge-receiving or other layers · CPC title

• G03G5/142

  Inert intermediate layers · CPC title

• G03G5/144 Primary

  comprising inorganic material · CPC title

• G03G2215/00957

  Compositions · CPC title

• G03G15/0266

  Arrangements for controlling the amount of charge · CPC title