Abstract A fixing device comprises a first heater, a second heater having a heat distribution different from that of said first heater, a heating member heated by said first and second heaters, a temperature detecting element for detecting the temperature of said heating member, and power supply control means for controlling the power supply to said first heater and second heater in such a manner that the temperature detected by said temperature detecting element is maintained at a target temperature. After a fixing operation and until the temperature detected by said temperature detecting element rises from the fixing temperature to a stand-by temperature higher than said fixing temperature, said power supply means is adapted to effect power supply control different from that in the stand-by state.
A fixing device comprising: a first heater; a second heater having a heat distribution different from that of said first heater; a heating member heated by said first and second heaters; a temperature detecting element for detecting the temperature of said heating member; and power supply control means for controlling the power supply to said first heater and second heater in such a manner that the temperature detected by said temperature detecting element is maintained at a target temperature; wherein, after a fixing operation and until the temperature detected by said temperature detecting element rises from the fixing temperature to a stand-by temperature higher than said fixing temperature, said power supply means is adapted to effect power supply control different from that in the stand-by state.
Claim 2
Dependent Claim
43 words
A fixing device according to claim 1, wherein said first heater generates a larger amount of heat in the central portion in the longitudinal direction of said heating member, and said second heater generates a larger amount of heat in the end portions.
Claim 3
Dependent Claim
22 words
A fixing device according to claim 2, wherein said temperature detecting element is provided in the central area of said heating member.
Claim 4
Dependent Claim
54 words
A fixing device according to claim 1, wherein, after a fixing operation and until the temperature detected by said temperature detecting element rises from the fixing temperature to the stand-by temperature, said power supply control means is adapted to select a higher power supply ratio to said first heater than in the stand-by state.
Claim 5
Dependent Claim
68 words
A fixing device according to claim 1, wherein, after a fixing operation and until the temperature detected by said temperature detecting element rises from the fixing temperature to the stand-by temperature, said power supply control means is adapted to set the target temperature at a value higher than the fixing temperature but lower than the stand-by temperature, and then to set the target temperature at the stand-by temperature.
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