| 摘要 |
PURPOSE:To surely erase the electric charge in a designated area without being affected by the variable density of an original, by controlling the supply current to an LED in accordance with the density of the original. CONSTITUTION:An original D is placed on an original retainer 5, and a specific area of the original is retained from above to designate an image forming area while seeing the original through a touch panel 6, and the designated area is detected by the touch panel 6. When a print switch is operated to start the copying operation, an image in a range corresponding to the designated image forming area is formed on a photosensitive drum 14 by exposure from an optical system and the irradiated light from a destaticizing unit 16 controlled by a control part. Since a supply current corresponding to the density of the original indirectly detected by a surface potential sensor S is applied to LEDs corresponding to the non-image forming area in this case, the surface potential on a part of the photosensitive drum 14 corresponding to the area designated by a tablet input part is extinguished without being affected by the variable density of the original. |
