| 摘要 |
PURPOSE:To form a picture with an appropriate picture density according to the picture density of an original by receiving light in an optical system by a movable light receiving means, detecting the quantity of the received light by a detecting means and controlling a value outputted to an electrifying means by a control means according to the detected value. CONSTITUTION:The optical fiber light receiving part 16 of an optical fiber 16S connected to a light receiving sensor 16Z detecting the density of the surface of the original 2 is movable, and the light receiving sensor 16Z detects the density of part of the original 2. Its range is specified, and an electrification control part 22 controls an electrifying amount according to the specified range. As a result, electrification can be controlled appropriately according to the specified range. A picture with an appropriate picture density can be formed on a body where a picture is formed according to the picture density of the original 2. |
