| 摘要 |
PURPOSE:To easily adjust exposure at a fixed position, by arranging a screening member having a slit-like opening part to adjust exposure at a place close to a position where is unvariably irradiated by exposed light flux during the exposure through the slit. CONSTITUTION:The screening member 6 having the slit-like opening part is used for cutting out stray light or uniforming the quantity of exposure at an image formation part. Since a position P on which exposed light flux from a slit scanning starting position A is intersected with the exposed light flux from a scanning end position B is unvariably irradiated by the exposed light flux during the exposure through the slit, the screening member 6 is placed on the position P. Thus the exposure can be easily adjusted at the fixed position and proper exposure to the photoreceptor is attained without using a driving device. |
