Image heating apparatus capable of changing duty ratio

Details Image heating apparatus capable of changing duty ratio Image heating apparatus capable of changing duty ratio

1993-03-29

1994-11-15

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

335285, 219216, 219497, G03G 1520

Patent

active

053653149

ABSTRACT:
An image heating apparatus includes a heater; a temperature detecting member for detecting a temperature of the heater; the controller for controlling electric power supplied to the heater so that the temperature detected by the temperature detecting member is maintained at a predetermined temperature; comparing device for comparing the temperature detected by the temperature detecting member to the reference temperature; wherein, when the detected temperature remains to be no less than the reference temperature for a predetermined period of time, the controller reduces a duty ratio of the electric power to be supplied to the heater.

REFERENCES:
patent: 4496829 (1985-01-01), Black et al.
patent: 5149941 (1992-09-01), Hirabayashi et al.

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