FIXING DEVICE AND IMAGE FORMING APPARATUS

• Main Authors: TAMAKI SHUNTARO, YUASA SHUTARO, YOSHINAGA HIROSHI, SHIMOKAWA TOSHIHIKO, IKEFUCHI YUTAKA, ARAI YUJI, SEKI TAKAYUKI, SAITO KAZUYA, MINBU RYUICHI
• Format: Patent
• Language: English; Japanese
• Published: 15.12.2014
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To provide a fixing device that can suppress deformation of a shield member due to the excessive temperature rise, and an image forming apparatus that includes the fixing device.SOLUTION: A fixing device 100 includes a hollow surface endless moving body 121, a pressure member 122 that is brought into contact with the outer peripheral surface of the surface endless moving body, a nip forming member 24 that is arranged on the inner peripheral side of the surface endless moving body and brought into contact with the pressure member with the surface endless moving body interposed therebetween to form a nip part, and a heat source 23 that is arranged on the inner peripheral side of the surface endless moving body and heats the surface endless moving body by radiation heat, and passes recording materials P through the nip part to fix images on the recording materials. The fixing device 100 is further provided with a plurality of shield members 29 that can be moved between a shield position to shield the radiation heat from the heat source to a non-paper width area of the surface endless moving body and a retreat position retreated from the shield position, and has control means for controlling the operation of the shield members. 【課題】遮蔽部材の温度が上がり過ぎて変形するのを抑制できる定着装置、及び、その定着装置を備えた画像形成装置を提供する。【解決手段】内部が中空の表面無端移動体１２１と、表面無端移動体の外周面と当接する加圧部材１２２と、表面無端移動体の内周側に配置され表面無端移動体を介して加圧部材と当接してニップ部を形成するニップ形成部材２４と、表面無端移動体の内周側に配置され表面無端移動体を輻射熱により加熱する熱源２３とを備え、ニップ部に記録材Ｐを通過させて画像を記録材に定着させる定着装置１００において、熱源と表面無端移動体との間に、熱源から表面無端移動体の非通紙幅領域への輻射熱を遮蔽する遮蔽位置と、遮蔽位置から退避した退避位置との間で移動可能な遮蔽部材２９を複数設けており、各遮蔽部材の動作を制御する制御手段を有する。【選択図】図１