| 摘要 |
PROBLEM TO BE SOLVED: To obtain stable heating property (fixing property) regardless of the type of recording material (smooth paper or rough paper) in an image heating device, which includes a heating body 21 arranged fixedly, a heating rotary body 23 allowed to slide with its internal face being in contact with the heating body, a pressure rotary body 24 providing a nip part N together with the heating body via the heating rotary body, and which heats an image on the recording material by heat from the heating body via the heating rotary body while sandwiching and carrying the recording material P with the image t between the heating rotary body and the pressure rotary body in the nip part. SOLUTION: The target temperature and target supply power for the heating body or the heating rotary body are set in accordance with the number of sheets of recording paper to be inserted and a paper insertion mode. At least, one of the target temperature and the target supply power is corrected in the course of heating the image. The target power is determined with respect to the adjusted target temperature. When supplied power is small, it is determined that the paper is rough. Therefore, the temperature is adjusted so as to increase. Alternatively, a fixed amount of power is supplied in accordance with the adjusted target temperature, the temperature of the heating body at the time is then monitored, and a temperature variation is restricted so as to fall within a fixed range.
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