# US 2010/0166468 A1 · Image forming apparatus

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- Number: US 2010/0166468 A1
- Document ID: US20100166468A1
- Status: Published application
- Kind: A1
- Application number: 12/721,863
- Filed: 2010-03-11
- Published: 2010-07-01
- Earliest claimed: 2006-12-12
- Assignees: Canon Kabushiki Kaisha
- Inventors: Masayuki TAMAKI
- Web page: https://patentgrep.com/patent/US20100166468A1

## CPC

- G03G 15/161: {with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent}
- G03G 15/1605: {using at least one intermediate support (G03G15/1625 takes precedence)}
- G03G 2215/1623: Transfer belt
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An image forming apparatus includes a first image carrying member for carrying a first toner image; a second image carrying member for carrying a second toner image in a maximum amount, of the second toner image carried on the second image carrying member, larger than a maximum amount of the first image carried on the first image carrying member; a first transfer member for electrostatically transferring the first toner image onto a transfer medium in a first transfer nip formed by bringing the transfer medium into contact with the first, image bearing member; and a second transfer member for electrostatically transferring the second toner image onto the transfer medium in a second transfer nip formed by bringing the transfer medium into contact with the second bearing member so that a length of the second transfer nip with respect to a movement direction of the transfer member is longer than a length of the first transfer nip with respect to the movement direction.

## Claims

### Claim at position 1

1-11. (canceled)

### Claim 12

An image forming apparatus comprising:
a first image carrying member for carrying a first toner image formed with at least one of a chromatic toner and a black toner;
a second image carrying member for carrying a second toner image formed with a transparent toner;
a first transfer member for electrostatically transferring the first toner image onto a transfer medium in a first transfer nip formed by bringing the transfer medium into contact with said first image carrying member; and
a second transfer member for electrostatically transferring the second toner image onto the transfer medium in a second transfer nip formed by bringing the transfer medium into contact with said second image carrying member so that a length of the second transfer nip with respect to a movement direction of the second transfer member is longer than a length of the first transfer nip with respect to the movement direction.

### Claim 13 (depends on 12)

An apparatus according to claim 12, wherein a contact pressure between said second transfer member and the transfer medium is larger than a contact pressure between said first transfer member and the transfer medium.

### Claim 14 (depends on 12)

An apparatus according to claim 12, wherein each of said first transfer member and said second transfer member has a roller shape and a diameter of said second transfer member is larger than a diameter of said first transfer member.