Image heating apparatus and heater used therefor

Details Image heating apparatus and heater used therefor Image heating apparatus and heater used therefor

2007-03-20

2007-03-20

Pelham, Joseph (Department: 3742)

Electric heating

Heating devices

Combined with diverse-type art device

C399S329000

Reexamination Certificate

active

11154546

ABSTRACT:
The image heating apparatus for heating an image formed on a recording material includes a heater having a substrate and first and second heat generating resistors, most of the region of said first heat generating resistor having smaller resistance value per unit length toward an end in the longitudinal direction of said substrate, and most of the region of said second heat generating resistor having larger resistance value per unit length toward the end part; wherein a safety element can control electrical power supply to said first heat generating resistor and electrical power supply to said second heat generating resistor individually, and operates in response to the heat of said heater to cut off electrical power supply to said first and second heat generating resistors; and wherein only said second heat generating resistor in said first and second heat generating resistors has a high resistance part high resistance part corresponding to said safety element in a part in the longitudinal direction thereof; and consequently, this can provide an image heating apparatus that can cut off electrical power supply quickly when a heater has run away and to provide a heater to be used in this apparatus.

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