| 摘要 |
PURPOSE:To correct an ununiform illumination distribution on photosensitive materials at a variable magnification time and to improve reliability in a simple construction, by providing auxiliary lamps at end parts of a main lamp and changing a composite illumination distribution by changing optical outputs of the auxiliary lamps. CONSTITUTION:A main lamp 14 is provided with light emitting elements 171 at both ends having large optical output, a pair of light emitting elements 172 in the middle having a little large optical output and a light emitting element 173 in the center having little optical output, and its illumination distribution is almost in a U shape having a high illumination intensity at both end parts and having lower intensity in turn to the center. Auxiliary lamps 15 are provided parallelly at the positions almost facing to the elements 171 at both sides and are connected to an electric source 18, and a voltage value of the electric source 18 is controlled by a controller 19 and is constituted so that a voltage value is controlled in accordance with variable magnification signals R after the signals R are inputted into the controller 19. By this way, an ununiform illumination distribution on photosensitive materials at a variable magnification time is corrected. |
