# US 2018/0024478 A1 · Image heating device

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- Number: US 2018/0024478 A1
- Document ID: US20180024478A1
- Status: Published application
- Kind: A1
- Application number: 15/647,062
- Filed: 2017-07-11
- Published: 2018-01-25
- Earliest claimed: 2016-07-21
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Takaaki Akamatsu; Masashi Tanaka; Kensuke Umeda; Shoichiro Ikegami; Sho Taguchi; Ai Suzuki
- Web page: https://patentgrep.com/patent/US20180024478A1

## CPC

- G03G 15/2039: {with means for controlling the fixing temperature}
- G03G 15/2042: {specially for the axial heat partition}
- G03G 15/5004: {Power supply control, e.g. power-saving mode, automatic power turn-off}
- G03G 15/55: {Self-diagnostics; Malfunction or lifetime display}
- G03G 15/80: {Details relating to power supplies, circuits boards, electrical connections}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An image heating device includes a rotator, a heater including a heat generating resistor, a connector electrically connected to the heater, and a power interrupting unit that detects an abnormal temperature rise of the heater and interrupt supply of the power to the heater. The power interrupting unit includes a first terminal and a second terminal, a first conductive sheet metal that electrically connects the connector to the first terminal, a second conductive sheet metal that to electrically connects the connector to the second terminal via the heat generating resistor, a length of the second conductive sheet metal being different from a length of the first conductive sheet metal in the longitudinal direction of the heater, and a supporting member supporting the heater and including a regulation portion that regulates rotation of the power interrupting unit.

## Claims

### Claim 1

An image heating device heating an image on a recoding medium, the image heating device comprising:
a rotator;
a heater having an elongated shape, that heats the rotator, the heater including a heat generating resistor that generates heat by receiving power;
a connector electrically connected to a longitudinal end portion of the heater to supply the power to the heater;
a power interrupting unit that detects an abnormal temperature rise of the heater and interrupt supply of the power to the heater, the power interrupting unit including a first terminal and a second terminal;
a first conductive sheet metal that electrically connects the connector to the first terminal, the first conductive sheet metal extending in a longitudinal direction of the heater;
a second conductive sheet metal that electrically connects the connector to the second terminal via the heat generating resistor, the second conductive sheet metal extending in the longitudinal direction of the heater, a length of the second conductive sheet metal in the longitudinal direction of the heater being different from a length of the first conductive sheet metal in the longitudinal direction of the heater; and
a supporting member that supports the heater, the supporting member including a regulation portion configured to regulate rotation of the power interrupting unit,
wherein the image formed on the recording medium is heated with heat from the heater via the rotator.

### Claim 2 (depends on 1)

The image heating device according to claim 1, wherein, in the longitudinal direction of the heater, the length of the first conductive sheet metal is longer than the length of the second conductive sheet metal.

### Claim 3 (depends on 2)

The image heating device according to claim 2, wherein the regulation portion is arranged opposite to a portion of the first conductive sheet metal to which the first terminal is connected.

### Claim 4 (depends on 2)

The image heating device according to claim 2, wherein the regulation portion is arranged opposite to a portion of the second conductive sheet metal to which the second terminal is connected.

### Claim 5 (depends on 2)

The image heating device according to claim 2, wherein the first terminal and the second terminal extend in opposite directions each in the longitudinal direction of the heater.

### Claim 6 (depends on 2)

The image heating device according to claim 2, wherein, in the longitudinal direction of the heater, the first conductive sheet metal and the power interrupting unit overlap with each other in a region which is further from the connecter than the longitudinal end portion of the second conductive sheet metal.

### Claim 7 (depends on 6)

The image heating device according to claim 6, wherein a portion of the first conductive sheet metal overlapping with the power interrupting unit is configured such that a thickness direction of the first conductive sheet metal is parallel to a transverse direction of the heater perpendicular to a longitudinal direction of the heater.