| 摘要 |
PURPOSE:To attain size reduction and cost reduction by changing a lens position, thereby varying print size. CONSTITUTION:A lens 12 is positioned selectively at the 1st and the 2nd positions P1 and P2 where two kinds of magnification for forming an image on a photosensitive material 14 and obtained within specific conjugation length between an image surface where an image to be printed is radiated as an optical image of specific size and the photosensitive material 14. Thus, the 1st and the 2nd positions P1 and P2 where the lens 12 is set are changed to vary the image size.
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