| 摘要 |
PURPOSE:To prevent dew condensation and moisture absorption and to form a distinct image, and to save energy by controlling respective environment heater means according to detected values of temperature and humidity. CONSTITUTION:A photosensitive drum A is provided with temperature sensors 1-4 and humidity sensors 5-7, which detect the humidity in an optical box, the humidity in a drum surface area, and the humidity at the periphery of a fixing device 29. Heaters 8-11 heat the drum, a fixing device roller, a light source, and a lens. The heaters for the respective heated members are powered on and off according to the results of comparison between detected values of the respective temperature and humidity sensors and set reference values. |
