| 摘要 |
PURPOSE:To make the distance from one end where there is photosensitive paper up to the end edge of the original image copied on the photosensitive paper constant irrespectively of the change in magnification by inputting the extents of movement of a lens and a reflecting mirror according to the change in the set magnification and moving the position of the photosensitive paper by as much as the extent expressed by specific equations. CONSTITUTION:At a reference magnification m0, a lens 1 and a mirror 3 are in solid line positions, and the end edge 5c of an original 5 is imaged in the position 5M0 on an exposure plane 7. When the copying magnification is changed to m1, the lens 1 and the mirror 3 move respectively by extents DELTAa, DELTAl of movement and the end edge 5c of the original 5 is imaged in the position 5M0 on the plane 7. When the copying magnification is changed to m1, the lens 1 and the mirror 3 move respectively by extents DELTAa, DELTAl of movement and the end edge 5c of the original 5c is imaged in the positon 5M1 on the plane 7. Here the photosensitive paper is moved by the distance U calculated by the equation U=(1+K)DELTAl-KDELTAa by inputting the constant K obtd. by deviding the distance L from the optical axis on the original platen up to the reference position 5c of the original by the focal length of the lens and the extents DELTAa, DELTAl of movement, whereby the distance G from one end where there is the photosensitive paper up to the end edge of the original image is made constant irrespectively of the change in magnification. |
