Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorTomohiro Tamaoki
Life of this patent
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Abstract
An image forming apparatus that can maintain the accuracy of temperature control of an object to be heated within a predetermined range and avoid adverse effects of contamination of first temperature detection means. The image forming apparatus 1 has a photosensitive drum 14, a heater 901, a thermopile temperature sensor 902, a non-contact thermistor 903, and a control circuit 904. The control circuit 904 controls the heater 901 based on an output signal 902s in a case where the output signal 902s is output earlier in time than the output signal 903s, and informs of a state of the thermopile temperature sensor 902 in a case where the output signal 903s is output earlier in time than the output signal 902s.
Claims12
An image forming apparatus comprising:
- an image carrier that is rotationally driven;
- a heating device that heats said image carrier;
- a first temperature detection device that is disposed out of contact with a surface of said image carrier to detect temperature of said image carrier;
- a second temperature detection device that is disposed out of contact with the surface of said image carrier to detect the temperature of said image carrier;
- and
- a control device that controls said heating device based on a first surface temperature detection signal for said image carrier indicating a detection result of said first temperature detection device and a second surface temperature detection signal for said image carrier indicating a detection result of said second temperature detection device,
- wherein said control device controls said heating device based on said first surface temperature detection signal in a case where said first surface temperature detection signal is output earlier in time than said second surface temperature detection signal, and informs of a state of said first temperature detection device in a case where said second surface temperature detection signal is output earlier in time than said first surface temperature detection signal.
An image forming apparatus comprising:
- an image carrier that has a heating device and is rotationally driven;
- a first temperature detection device that is disposed out of contact with a surface of said image carrier to detect temperature of said image carrier;
- a second temperature detection device that is disposed out of contact with the surface of said image carrier to detect the temperature of said image carrier;
- a correction section that corrects a first surface temperature detection signal based on a second surface temperature detection signal for said image carrier indicating a detection result of said second temperature detection device that is obtained when said heating device is controlled to a predetermined temperature based on the first surface temperature detection signal for said image carrier indicating a detection result of said first temperature detection device;
- and
- a control device that controls said heating device based on said first surface temperature detection signal corrected by said correction section.
Dependencies are inferred from the claim text.