# US 10,372,049 B2 · Electrophotographic photoreceptor, process cartridge, and image-forming apparatus

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- Number: US 10,372,049 B2
- Document ID: US10372049B2
- Status: Granted
- Kind: B2
- Application number: 15/699,368
- Filed: 2017-09-08
- Published: 2018-09-27
- Granted: 2019-08-06
- Earliest claimed: 2017-03-22
- Assignees: Fuji Xerox Co., Ltd.
- Applicants: Fuji Xerox Co., Ltd.
- Inventors: Akihiro Kawasaki; Hirofumi Nakamura; Yohei Saito; Keisuke Kusano
- Web page: https://patentgrep.com/patent/US10372049B2

## CPC

- G03G 5/102: {consisting of or comprising metals}
- G03G 5/04: Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G 5/0564: {Polycarbonates}
- G03G 5/0592: {Macromolecular compounds characterised by their structure or by their chemical properties, e.g. block polymers, reticulated polymers, molecular weight, acidity}
- G03G 5/0609: {containing oxygen}
- G03G 5/06142: {arylamine}
- G03G 5/061443: {benzidine}
- G03G 5/06147: {alkenylarylamine}
- G03G 5/061473: {plural alkenyl groups linked directly to the same aryl group}
- G03G 5/0618: {containing oxygen and nitrogen}
- G03G 5/0631: {containing two hetero atoms}
- G03G 5/0668: {containing only one methine or polymethine group}
- G03G 5/0672: {containing two or more methine or polymethine groups}
- G03G 5/0677: {Monoazo dyes}
- G03G 5/0696: {Phthalocyanines}
- G03G 21/18: using a processing cartridge {, whereby the process cartridge comprises at least two image processing means in a single unit}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An electrophotographic photoreceptor includes a conductive support and a single-layer photosensitive layer. The conductive support has an outer peripheral surface with a maximum surface roughness height (Rmax) of about 4.0 μm or less, and the outer peripheral surface has a recess with a depth-to-aperture size ratio (depth/aperture size) of about 0.03 or more and about 0.12 or less. The single-layer photosensitive layer is disposed on the conductive support and has a thickness of about 20 μm or more and a modulus of elasticity of about 4.5 GPa or more.

## Claims

### Claim 1

An electrophotographic photoreceptor comprising:
a conductive support having an outer peripheral surface with a maximum surface roughness height (Rmax) of about 4.0 μm or less and about 3.0 μm or more, the outer peripheral surface having a recess with a depth-to-aperture size ratio (depth/aperture size) of about 0.03 or more and about 0.12 or less; and
a single-layer photosensitive layer disposed on the conductive support and having a thickness of about 20 μm or more and a modulus of elasticity of about 4.5 GPa or more,
wherein the conductive support is hollow and has a wall thickness of about 0.8 mm or less.

### Claim 2 (depends on 1)

The electrophotographic photoreceptor according to claim 1, wherein the conductive support is a conductive support having an outer peripheral surface having a recess with a depth-to-aperture size ratio (depth/aperture size) of about 0.06 or more and about 0.12 or less.

### Claim 3 (depends on 1)

The electrophotographic photoreceptor according to claim 1, wherein the photosensitive layer has a modulus of elasticity of about 4.5 GPa or more and about 5.0 GPa or less.

### Claim 4 (depends on 1)

The electrophotographic photoreceptor according to claim 1, wherein the photosensitive layer has a modulus of elasticity of about 4.6 GPa or more and about 5.0 GPa or less.

### Claim 5 (depends on 1)

The electrophotographic photoreceptor according to claim 1, wherein the photosensitive layer has a modulus of elasticity of about 4.7 GPa or more and about 5.0 GPa or less.

### Claim 6 (depends on 1)

The electrophotographic photoreceptor according to claim 1, wherein the photosensitive layer has an outer peripheral surface with a center line average roughness (Ra) of about 0.05 μm or more and about 0.3 μm or less.

### Claim 7 (depends on 1)

The electrophotographic photoreceptor according to claim 1, wherein the photosensitive layer has an outer peripheral surface with a center line average roughness (Ra) of about 0.05 μm or more and about 0.2 μm or less.

### Claim 8 (depends on 1)

The electrophotographic photoreceptor according to claim 1, wherein the conductive support has a wall thickness of about 0.4 mm or more and about 0.6 mm or less.

### Claim 9 (depends on 1)

The electrophotographic photoreceptor according to claim 1, wherein the conductive support is an impact-pressed product.

### Claim 10 (depends on 9)

The electrophotographic photoreceptor according to claim 9, wherein the conductive support is an ironed impact-pressed product.

### Claim 11 (depends on 1)

A process cartridge comprising the electrophotographic photoreceptor according to claim 1,
wherein the process cartridge is attachable to and detachable from an image-forming apparatus.

### Claim 12 (depends on 1)

An image-forming apparatus comprising:
the electrophotographic photoreceptor according to claim 1;
a charging unit that charges a surface of the electrophotographic photoreceptor;
an electrostatic latent image forming unit that forms an electrostatic latent image on the charged surface of the electrophotographic photoreceptor;
a developing unit that develops the electrostatic latent image formed on the surface of the electrophotographic photoreceptor with a developer containing a toner to form a toner image; and
a transfer unit that transfers the toner image to a surface of a recording medium.