FIXING DEVICE AND IMAGE FORMING APPARATUS

• Main Authors: SHIMOKAWA TOSHIHIKO, YOSHIURA ARINOBU, SAITO KAZUYA, MINBU RYUICHI, KUNO SATOSHI, YAMANAKA KENTARO
• Format: Patent
• Language: English; Japanese
• Published: 19.11.2020
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To prevent deviation in temperature in a circumferential direction of a fixing member.SOLUTION: A fixing device comprises: an endless fixing belt; a heat source that heats the fixing belt from the inside; a pressure member that is arranged opposite to the fixing belt and is brought into pressure contact with the fixing belt to form a nip part; a nip forming member that is arranged inside the fixing belt and receives a pressure applied from the pressure member to form a nip part; a bearing member that supports the nip forming member; and movable means for the heat source. The support member has, in substantially the entire area in the longitudinal direction, a bent part that surrounds the heat source moved by the movable means, and the movable means moves the position of the heat source to the bent part to change a heating area for the fixing belt and attenuates infrared light.SELECTED DRAWING: Figure 5 【課題】定着部材の周方向の温度偏差を抑制する。【解決手段】無端状の定着ベルトと、定着ベルトを内部から加熱する加熱源と、定着ベルトと対向して配置され、定着ベルトに加圧されてニップ部を形成する加圧部材と、定着ベルト内部に配置され、加圧部材からの加圧力を受けてニップ部を形成するニップ形成部材と、ニップ形成部材を支持する支持部材と、加熱源の可動手段と、を備え、支持部材は、長手方向略全域に、可動手段により移動された加熱源を囲む屈曲部を有し、可動手段は、加熱源の位置を屈曲部に移動させることにより、定着ベルトへの加熱領域を変化させるとともに赤外光を減衰させる。【選択図】図５