# US 6,295,428 B1 · Image forming apparatus carrying charged particles on resin sleeve

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- Number: US 6,295,428 B1
- Document ID: US6295428B1
- Status: Granted
- Kind: B1
- Application number: 09/461,764
- Filed: 1999-12-15
- Granted: 2001-09-25
- Earliest claimed: 1998-12-17
- Assignees: Canon Kabushiki Kaisha
- Inventors: Hiroyuki Suzuki
- Web page: https://patentgrep.com/patent/US6295428B1

## CPC

- G03G 15/0241: {by bringing charging powder particles into contact with the member to be charged, e.g. by means of a magnetic brush}
- G03G 2215/022: using a magnetic brush
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

What is provided is an image forming apparatus in which a particle carrier is not contaminated with toner. The image forming apparatus comprises an image carrier for carrying a toner image, and charging means for charging the image carrier, the charging means having charged particles to be brought into contact with the image carrier and particle carrier carrying the charged particles and having a resin layer containing a conductive material on its surface.

## Claims

### Claim 1

An image forming apparatus comprising:
an image carrier;
charging means for charging said image carrier, said charging means charging at least in part using charging particles in contract with said image carrier during charging, said charging means having a particle carrier to carry the charging particles;
an electrostatic image forming means for forming an electrostatic image on said image carrier charged by said charging means; and
developing means for developing said electrostatic image on said image carrier by toner;
wherein said particle carrier is formed with a surface resin layer containing a conductive material.

### Claim 2 (depends on 1)

An apparatus according to claim 1, wherein said conductive material is a powder.

### Claim 3 (depends on 1)

An apparatus according to claim 1, wherein said conductive material is one of graphite and carbon black.

### Claim 4 (depends on 1)

An apparatus according to claim 1, wherein a resin for forming said resin layer comprises at least one resin selected from the group consisting of silicone resin, fluorine resin, polyethersulfone resin, polycarbonate resin, polyphenylene oxide resin, polyamide resin, phenolic resin, polyester resin, polyurethane resin, and styrene-based resin.

### Claim 5 (depends on 1)

An apparatus according to claim 1, wherein triboelectrification polarity of toner with respect to said resin layer is the same as normal charging polarity of the toner.

### Claim 6 (depends on 1)

An apparatus according to claim 1, further comprising:
transfer means for transferring the toner image on said image carrier onto a transfer material,
wherein said charging means charges said image carrier from which untransferred residual toner is not removed.

### Claim 7 (depends on 1)

An apparatus according to claim 1, wherein said charged particles are magnetic, and said particle carrier internally comprises a magnet.