| CPC G03G 15/2039 (2013.01) [G05F 1/463 (2013.01); G03G 2215/00978 (2013.01)] | 15 Claims |
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1. An image forming apparatus comprising:
a fixing member configured to fix a toner image transferred onto a recording material, to the recording material by heating the toner image;
a heating portion configured to heat the fixing member by being supplied with electric power;
a power source configured to supply electric power to the heating portion;
a temperature detector configured to output an output voltage that corresponds to a temperature of the fixing member or a temperature of the heating portion;
a controller configured to control power supply from the power source to the heating portion based on the output voltage from the temperature detector, such that the temperature of the fixing member is maintained at a predetermined temperature;
a reference voltage generator configured to generate a reference voltage; and
a breaker configured to stop the power supply from the power source to the heating portion when a temperature that corresponds to the output voltage from the temperature detector becomes higher than a temperature that corresponds to the reference voltage,
wherein the reference voltage generator is configured to output the reference voltage that changes with time having elapsed since a start of heating at which the power supply to the heating portion was started by the controller, such that a temperature corresponding to the reference voltage obtained when a first time has elapsed since the start of heating is lower than a temperature corresponding to the reference voltage obtained when a second time longer than the first time has elapsed since the start of heating, and
wherein the reference voltage generator is configured to change the reference voltage such that the reference voltage changes linearly with the time having elapsed since the start of heating, from a low temperature side toward a high temperature side.
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