Patent ID: 7555233

Claim:
A fixing device for fixing a developer image to a recording medium, said fixing device comprising: a heat source; a heating member heated by said heat source so as to heat said recording medium; a pressing member disposed in contact with said heating member so as to form a contact portion between said pressing member and said heating member, a cover provided so as to cover said heating member, said cover having an insertion opening through which said recording medium is fed into said cover and an election opening through which said recording medium is fed out of said cover, said cover having a partition wall so that a substantially enclosed space is formed by said partition wall and a surface of said heating member, said partition wall being configured to isolate said substantially enclosed space from said insertion opening and said ejection opening; a first temperature detecting unit that detects a temperature of said heating member and is remote from said heating member; a second temperature detecting unit disposed in said substantially enclosed space, said second temperature detecting unit being disposed in the proximity of said first temperature detecting unit and disposed above a portion of the circumferential surface of said heating member in opposition to said contact portion; and a control unit that controls said heat source according to detected temperatures detected by said first and second temperature detecting units.