Fixing device and image forming apparatus including same

摘要

A fixing device includes an endless belt or a fixing belt; a pressure member to contact an outer circumferential surface of the fixing belt; a nip forming member disposed at an interior side of the fixing belt and contacting the pressure member via the fixing belt; a heat source disposed at an interior side of the fixing belt to heat the fixing belt with radiant heat, a plurality of shielding members disposed between the heat source and the fixing belt and movable between a shielding position where the shielding member shields a non-sheet passing area on the fixing belt from the radiant heat from the heat source and a retracted position; and a controller to move the plurality of shielding members between the shielding position and the retracted position at a predetermined time.

主权项

1. A fixing device comprising:
an endless moving member; a pressure member to contact an outer circumferential surface of the endless moving member; a nip forming member disposed at an interior side of the moving member and contacting the moving member against the pressure member to form a nip portion; a heat source disposed at an interior side of the moving member to heat the moving member with radiant heat, wherein a recording medium is conveyed through the nip portion to fix an image onto the recording medium; plural shielding members disposed between the heat source and the moving member and movable along a circumference of the endless moving member between a shielding position where the plural shielding members shield a non-sheet passing area on the moving member from the radiant heat from the heat source and a retracted position; and a control circuit to move each of the plural shielding members between the shielding position and the retracted position.