| 摘要 |
PURPOSE:To correct an ununiform illuminance distribution on photosensitive materials at a variable magnification time and to improve reliability in a simple construction, by providing plural lamps having different characteristics and changing a composite illuminance distribution by changing those optical output ratio. CONSTITUTION:Underneath a platen glass member 11 on which an original 10 is placed, the first and second lamps 12, 13 are provided in parallel with each other so that an original surface 10a is irradiated and a reflector 14 is provided around the first and second lamps. The first lamp 12 is provided with the first - fifth unit light emitting elements 121-125 in a lengthwise direction and its illuminance distribution has high illuminances at both sides, lower in turn toward the center and lowest at the center part. The second lamp 13 is provided with the first - fifth light emitting elements 141-145 having equal light emitting amount in a lengthwise direction and its illuminance distribution is flat in a lengthwise direction. By this way, an ununiform illuminance distribution on photosensitive materials at a variable magnification time is corrected. |
