# US 9,519,252 B2 · Fixing device

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- Number: US 9,519,252 B2
- Document ID: US9519252B2
- Status: Granted
- Kind: B2
- Application number: 14/962,104
- Filed: 2015-12-08
- Published: 2016-06-16
- Granted: 2016-12-13
- Earliest claimed: 2014-12-10
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Tomoya Tateishi; Masafumi Maeda; Takashi Narahara; Toru Imaizumi; Yasuhito Minamishima
- Web page: https://patentgrep.com/patent/US9519252B2

## CPC

- G03G 15/206: {Structural details or chemical composition of the pressure elements and layers thereof}
- G03G 15/2053: {Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating}
- G03G 15/80: {Details relating to power supplies, circuits boards, electrical connections}
- G03G 2215/2035: the fixing nip having a stationary belt support member opposing a pressure member
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

In a fixing device according to an exemplary embodiment of the present invention, a projection portion projected in a direction opposite to a direction biased by the biasing member, from a body part of the biasing member, is provided in a biasing member configured to push a thermosensitive member which receives heat from a heater, toward the heater, so that a crack in the heater at the time of an abnormal temperature rise is prevented.

## Claims

### Claim 1

A fixing device configured to thermally fix an unfixed image formed on a recording material to the recording material, the fixing device comprising:
an elongated heater;
a holder formed from a thermoplastic resin which holds the heater in a longitudinal direction of the heater;
a reinforcing member which is in contact with the holder in the longitudinal direction and which reinforces the holder;
a thermosensitive member which is provided in a space between the holder and the reinforcing member and which receives heat from the heater through a through-hole provided in the holder; and
a biasing member which biases the thermosensitive member toward the heater,
wherein the biasing member includes a projection portion which is projected in a direction opposite to a direction biased by the biasing member, from a body part of the biasing member, and
wherein the projection portion is not in contact with the reinforcing member when the device is operating normally, and the projection portion contacts the reinforcing member, regulates a movement of the thermosensitive member, and restricts deflection of the heater when the holder becomes softened and the heater is deflected.

### Claim 2 (depends on 1)

The fixing device according to claim 1, wherein the biasing member is a plate spring and the projection portion is formed by folding of a part of the plate spring.

### Claim 3 (depends on 1)

The fixing device according to claim 1, wherein a width of the projection portion is narrower than a width of the body part.

### Claim 4 (depends on 1)

The fixing device according to claim 1, wherein the projection portion is provided in the longitudinal direction, in a region where the thermosensitive member is provided.

### Claim 5 (depends on 1)

The fixing device according to claim 1, further comprising a tubular film, the heater being in contact with an inner surface of the film.

### Claim 6 (depends on 1)

The fixing device according to claim 1, wherein the thermosensitive member includes a temperature detection element and the heater is controlled according to a temperature detected by the temperature detection element.