| 摘要 |
An image forming apparatus includes a photosensitive member; a charging device for electrically charging the photosensitive member; an exposure device for exposing to light the photosensitive member electrically charged by the charging device to form an electrostatic image; a developing device for developing the electrostatic image with toner to form a first patch and a second patch; a detecting device for detecting a density of the first and second patches formed by the developing device; and a control device for controlling an image forming condition on the basis of a difference in density between the first patch formed on the photosensitive member at a portion where a surface potential of the photosensitive member is zero volts and the second patch formed at a portion electrically charged by applying a predetermined charging bias to the charging device.
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