Patent ID: 7546051

Claim:
An image processing apparatus comprising: an image holding unit which forms an electrostatic latent image; a developing unit which provides a developer to the image holding unit, and changes the electrostatic latent image into a developer image; a transfer unit which transfers the developer formed in the image holding unit to a developer holding medium; a fixing unit apparatus including: a heating roller for supplying heat to the developer holding medium holding the developer image; a pressurizing roller which comes in contact with the heating roller; a heater having heating members for heating the heating roller; and a non-contact temperature detector which detects a first temperature of the heating roller in an area between a position heated by the heater and a position to contact the pressurizing roller with heating the heater, and a second temperature of the pressurizing roller in an area near a part to contact the heating roller; a reversing mechanism which reverses the developer holding medium ejected from the fixing unit, and returns to the image holding unit so that the back side of the developer holding medium with the developer image fixed is faced to the image holding unit; a memory which stores preset values of the first and second temperatures for a front side mode for fixing the developer image on one side, and preset values of the first and second temperatures for a back side mode for fixing the developer image on the other side of the developer holding medium reversed by the reversing mechanism, according to conditions of the developer holding medium; and a controller which heats the heating roller according to the back side mode, when an image is formed on the other side of the developer holding medium reversed by the reversing mechanism.