Patent ID: 8565644

Claim:
A fixing device comprising: a heating roller; a pressure roller configured to be pressed against the heating roller; a lamp cartridge having a plurality of heater lamps arranged in the heating roller, a first lamp holder for holding first ends of the heater lamps, and a second lamp holder for holding other ends of the heater lamps; a frame having an opening to allow replacement of the heating roller; a retaining member for retaining the heating roller against the frame, while holding the lamp cartridge at the center of the heating roller, and configured to close the opening of the frame; and an interlock means that allows locking and unlocking between the first lamp holder and the retaining member, wherein the first lamp holder is placed in the inner periphery of the retaining member, and wherein when replacing the heating roller, the retaining member is unlocked from the first lamp holder, and the retaining member and the heating roller are pulled out from the opening of the frame, while leaving the lamp cartridge in the fixing device.