| 摘要 |
In an image forming apparatus, a photosensitive drum 7 is previously charged to have a surface potential by a charger 7. A latent image is formed on the charged photosensitive drum 7 by projecting an optical image thereon. The latent image is developed by a developer which is charged in the developing unit and supplied from the developing unit 18. The developed latent image is transferred to and fixed on a paper. Environmental conditions such as temperature, humidity and atmospheric pressure around the photosensitive drum are detected by temperature, humidity and pressure detectors, and image densities of the image on the photosensitive drum are detected by a density sensor. The surface potential of the drum and the charge amount of developer are charged and controlled in accordance with the image densities and the environmental conditions, so that a high quality image is formed on the paper even if environmental conditions are changed.
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