| 摘要 |
<p>PURPOSE:To remove the illuminance irregularity caused by the positions of a lighting part, projecting lens and moving optical system and to obtain easily a copied image with a uniform density without fail by controlling the exposure with respect to a photosensitive body in accordance with the moving of a picture projected by the 2nd optical system. CONSTITUTION:When a microfilm 2 is projected with a rectangular mirror 6 at the position of a solid line, the image (a) is magnified and projected on the opening of a destaticizer 16 through an optical path 25. While the rectangular mirror 6 is moving to the position in the direction of an arrow as shown by an alternate long and short dash line, the image (b) of the microfilm 2 is magnified and projected on the opening of the destaticizer 16 through an optical path 26. In this case, assuming that the moving speed of the rectangular mirror 6 is half the peripheral velocity of a photosensitive drum 1, the total projected image is exposed on the photosensitive drum 1. The relationship between the moving speed V/2 of the rectangular mirror 6 and the peripheral velocity V of the photosensitive drum 1 is constant irrespective of the projection magnification of a lens 5, and the alternation of the lens magnification can be freely executed with the speed of the rectangular mirror 6 constant.</p> |
