FIXING DEVICE AND IMAGE FORMING APPARATUS

摘要

A fixing device includes a roller, a plurality of heaters, a temperature detection unit, and a control unit, wherein when the temperature detection unit detects that the temperature of longitudinal end portions of the roller is lower than a preset reference temperature, the control unit performs full-lighting control on the heater with the largest amount of heat supply to the end portions of the roller, out of the plurality of heaters, and performs lighting control on the heater with the second largest amount of heat supply to the end portions of the roller in a pattern at a predetermined duty ratio, or performs lighting control on the heater with the largest amount of heat supply to the end portions of the roller in a pattern at a predetermined duty ratio, and turns off the heater with the second largest amount of heat supply to the end portions of the roller.

主权项

1. A fixing device comprising:
a roller that fixes an image onto paper; a plurality of heaters that is provided within the roller and is configured to be different in distribution of heat supply amount along a longitudinal side of the roller; a temperature detection unit that detects the temperature of the roller; and a control unit that performs lighting control on the heaters in patterns of half-wave cycles of an alternating-current power source according to results of the detection by the temperature detection unit, wherein when the temperature detection unit detects that the temperature of end portions of the roller along the longitudinal side is lower than a preset reference temperature, the control unit performs full-lighting control on the heater with the largest amount of heat supply to the end portions of the roller, out of the plurality of heaters, and performs lighting control on the heater with the second largest amount of heat supply to the end portions of the roller, out of the plurality of heaters, in a pattern at a predetermined duty ratio, or performs lighting control on the heater with the largest amount of heat supply to the end portions of the roller, out of the plurality of heaters, in a pattern at a predetermined duty ratio, and turns off the heater with the second largest amount of heat supply to the end portions of the roller, out of the plurality of heaters.