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US 5,329,342 AGranted
Image fixing apparatus
AssigneeCanon Kabushiki Kaisha
InventorsMasanari Shirai, Kazuo Kagiura, Hiroyoshi Maruyama, Masashi Ohashi, Tatsuya Shiratori, Naomasa Kimura, Yoshikuni Toyama
Life of this patent
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Abstract
An image fixing apparatus includes a rotatable member for being heated by a heating source to fix an image on an image supporting member, first and second detecting elements responsive to temperature of the rotatable member, and wherein the first and second detecting elements are disposed on substantially the same circumferential line of the rotatable member.
Claims4
An image fixing apparatus comprising:
- a rotatable heating member having a heating source;
- a single temperature detecting member for detecting a temperature of a surface of said rotatable heating member to maintain a predetermined temperature by controlling power supply to said heating source;
- and
- an overheating preventing member for stopping power supply to the heating source upon overheating of said heating member.
- wherein said temperature detecting member and overheating preventing member are provided to said rotable heating member outside a supporting member passing region, and wherein said heating source has a heat distribution which is higher adjacent said temperature detecting member and said overheating preventing member than adjacent the supporting member passing region.
2 more elements
Dependencies are inferred from the claim text.