| 摘要 |
PURPOSE:To make uniform exposure possible in both reduction and magnification by providing plural lamps linearly and controlling the brightness of the respective lamps in accordance with copying magnifications. CONSTITUTION:The 1st-5th lamps 21-25 are linearly disposed in the position below platen glass 1 which is an original plane (a). The input voltages to the lamps are so controlled that the relative illuminance is B1 when the reduction or magnification position of an optical lens (b) is in the 1st reduction or magnification position b1, B2 when it is in the 2nd position b2 and B3 when it is in the 3rd position b3, so that the illuminance distributions of the original plane are corrected of the decrease in the illuminance around the optical lenses in accordance with the change in reduction or magnifications, whereby the illuminance distributions on the imaging plane are made uniform. |
