| 摘要 |
PURPOSE:To simplify the mechanism of the titled device and to make the device compact by displacing two scanning mirrors in the same direction as a scanning direction and changing the distance between both the scanning mirrors to change the optical path length and modify magnification. CONSTITUTION:A microfilm 1 is illuminated by an illuminating lamp 2 through a converging condenser lens 3 and an image on the microfilm 1 is exposed to a photosensitive drum 5 by a projection lens 4. The scanning exposing device 6 is arranged between the projection lens 4 in the optical path and the photosensitive drum 5. The device 6 is provided with a scanning mirror 7 on the incident side and a scanning mirror 8 on the outgoing side and both the mirrors 7, 8 are arranged with 90 deg. angle each other and scanned in the scanning direction S with a prescribed interval at the 1/2 peripheral speed of the drum 5. In case of the modification of magnification, the scanning mirrors 7, 8 are initially displaced in the same direction D as the moving direction S at the time of scanning as shown by dotted lines to correct the optical path length due to the change of the magnification and then moved in the scanning direction S at the same speed as the one obtained before the modification of the magnification to scan the image of the microfilm 1 through a slit 9.
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