# US 7,986,910 B2 · Lubricant coater, image bearing unit, and image forming apparatus

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- Number: US 7,986,910 B2
- Document ID: US7986910B2
- Status: Granted
- Kind: B2
- Application number: 12/177,475
- Filed: 2008-07-22
- Published: 2009-01-29
- Granted: 2011-07-26
- Earliest claimed: 2007-07-23
- Assignees: Ricoh Company, Ltd.
- Inventors: Toshiyuki Kabata; Kumiko Hatakeyama; Masahide Yamashita
- Web page: https://patentgrep.com/patent/US7986910B2

## CPC

- G03G 21/0011: {using a blade; Details of cleaning blades, e.g. blade shape, layer forming}
- G03G 2221/0084: Liquid
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

The present invention provides a lubricant coater including an applying member for applying a lubricant powder on a surface of an image bearing member, wherein the lubricant powder contains paraffin as a main component, and the lubricant coatability of the applying member is controlled such that a maximum thickness of a lubricant film formed on the image bearing member, which is obtained after the lubricant powder is continuously applied on the surface of the image bearing member for 120 minutes, is 0.25 μm or less.

## Claims

### Claim 1

A lubricant coater comprising:
an applying member for applying a lubricant powder on a surface of an image bearing member,
wherein the lubricant powder comprises paraffin as a main component, and
wherein the lubricant coatability of the applying member is controlled such that a maximum thickness of a lubricant film formed on the image bearing member, which is obtained after the lubricant powder is continuously applied on the surface of the image bearing member for 120 minutes, is 0.25 μm or less.

### Claim 2 (depends on 1)

The lubricant coater according to claim 1, wherein the image bearing member is a photoconductor provided with a photosensitive layer containing a polycarbonate resin; and in C1s spectrum of an x-ray photoelectron spectroscopy (XPS), among a plurality of waveforms generated by a plurality of carbon bond structures which are different from each other in the C1s spectrum, when a dimensional ratio of a composite waveform composed of a plurality of waveforms having peaks of intensity within the range of bond energy values of 290.3 eV to 294 eV relative to the entire dimension of the plurality of waveforms under the C1s spectrum is defined as a dimensional ratio A, a relation between a dimensional ratio A0 [%] corresponding to the dimensional ratio A of the surface of the photoconductor to which the lubricant has not yet been applied and a dimensional ratio At [%] corresponding to the dimensional ratio A of the surface of the photoconductor to which the lubricant has been continuously applied for 120 minutes satisfies a condition of “(A0−At)/A0×100≧70 [%]”.

### Claim 3 (depends on 1)

The lubricant coater according to claim 1, wherein the lubricant is a lubricant containing 40% by mass or more of a paraffin having a melting point of 70° C. to 130° C.

### Claim 4

An image bearing unit comprising:
an image bearing member for supporting a toner image on its surface, and
a lubricant applying unit configured to apply a lubricant on the surface of the image bearing member,
wherein the lubricant powder comprises paraffin as a main component, and
wherein the lubricant coatability of the applying member is controlled such that a maximum thickness of a lubricant film formed on the image bearing member, which is obtained after the lubricant powder is continuously applied on the surface of the image bearing member for 120 minutes, is 0.25 μm or less.

### Claim 5

An image forming apparatus, comprising:
an image bearing unit which comprises:
an image bearing member for supporting a toner image on its surface, and
a lubricant applying unit configured to apply a lubricant on the surface of the image bearing member, and
an image forming unit configured to form a toner image on the surface of the image bearing member,
wherein the lubricant powder comprises paraffin as a main component, and
wherein the lubricant coatability of the applying member is controlled such that a maximum thickness of a lubricant film formed on the image bearing member, which is obtained after the lubricant powder is continuously applied on the surface of the image bearing member for 120 minutes, is 0.25 μm or less.

### Claim 6

An image forming apparatus comprising:
an image bearing member for supporting a toner image on its surface,
a lubricant applying unit configured to apply a lubricant on the surface of the image bearing member, and
an image forming unit configured to form a toner image on the surface of the image bearing member,
wherein the lubricant coatability of the applying member is controlled such that a maximum thickness of a lubricant film formed on the image bearing member, which is obtained after the lubricant powder is continuously applied on the surface of the image bearing member for 120 minutes, is 0.25 μm or less.