Fixing device and image forming apparatus

A fixing device comprising:

• a fixing member;
• a heating member configured to be approach and withdraw from the fixing member;
• an endless fixing belt, wound around the fixing member and the heating member, configured to be driven to rotate;
• a nip forming member to form a nip while contacting the fixing belt at a position opposite the fixing member;
• a pressing member to press the heating member so as to separate from the fixing member;
• and
• a temperature detector to detect a temperature of the fixing belt at a position opposite the heating member, provided at a position opposite or in contact with the fixing belt along an outermost periphery of a displacement area of a surface of the fixing belt which displaces in accordance with the moving of the heating member as the heating member approaches and withdraws from the fixing member and parallel to the moving direction of the heating member, wherein the temperature detector is a thermistor in contact with the fixing belt, and a contact surface of the thermistor with the fixing belt is coated with a lubricant.

A fixing device comprising:

• a fixing member;
• a heating member configured to approach and withdraw from the fixing member;
• a support member that supportingly receives each of the fixing member and the heating member;
• an endless fixing belt, wound around the fixing member and the heating member, configured to be driven to rotate;
• a pressing member to press the heating member so as to separate it from the fixing member;
• and
• a temperature detector to detect a temperature of the fixing belt at a position opposite the heating member, positioned such that one of a distance and a contact pressure between the temperature detector and the fixing belt remains substantially constant as the heating member approaches and withdraws from the fixing member, wherein the heating member is movable within the support member.