Patent ID: 7768675

Claim:
An image forming apparatus, comprising: a media sensor that detects a type of a recording paper by one of a weight per unit and a thickness of the recording paper; a development unit configured to develop an image on the recording paper; a pair of rollers that fixes the image on the recording paper by nipping the recording paper bearing the image developed in the development unit and forcing the recording paper to pass by; a main heater that heats the pair of rollers by passing a current therethrough when the recording paper passes by; and an auxiliary heater that selectively heats at least one of the pair of rollers using an auxiliary power supply when the recording paper passes by the pair of rollers by passing a current therethrough in a case where the media sensor detects that one of the weight per unit of the recording paper and the thickness of the recording paper is equal to or greater than a specific value, wherein: the main heater is provided inside each of the pair of rollers to heat the rollers by passing a current therethrough, and the auxiliary heater is provided inside one of the pair of rollers to heat the roller provided with the auxiliary heater by passing a current through the auxiliary power supply connected to the auxiliary heater.