| 摘要 |
An image forming apparatus includes a fixing portion for heating and fixing an unfixed image formed on a recording material, said fixing portion including a heater having a heat generating element a substrate, a heat leveling member contacting said heater and having a thermal conductivity higher than that of the substrate, and a temperature detecting member for detecting a temperature of said heat leveling member; a controller for controlling electric power supplied to said heater a target temperature, wherein a period in which said controller raises the target temperature with increase of a number of the recording materials is provided in a period in which recording materials having widths smaller a width of maximum size recording material usable with said device are continuously subjected to fixing operations. |
