Patent ID: 11868067
Assignee: TOSHIBA TEC KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A fixing unit, comprising:
a first heater element that increases in electrical resistance with increases in temperature;
a second heater element; and
a controller configured to:
vary a duty ratio of electric power applied to the first heater element for raising the temperature of the first heater element to a target operating temperature, and
vary a duty ratio of electric power applied to the second heater element, wherein

the controller is configured to increase the duty ratio of electric power applied to the first heater element by varying duty ratio increments at fixed time intervals, and
the controller is configured to increase the duty ratio of electric power applied to the first heater element at a first fixed time interval and to increase the duty ratio of electric power applied to the second heater element at a second fixed time interval, the first and second fixed time intervals being different from each other.