| 摘要 |
PURPOSE:To easily obtain magnification other than life size by making light beams on optical axes of inverted real image systems parallel to one another, then making the parallel light beam into nonparallel light beams and crossing the light beam with one another in a space, and further making the nonparallel light beam into parallel light beams having different intervals from said parallel light beams. CONSTITUTION:The inclinations of reflecting mirrors arranged at points A2-C2 are set properly to make light beams which are projected from a body surface 1 and reach the points A2-E2 parallel to one another, and those light beams L1-L3 are reflected by reflecting mirrors arranged at the points A2-C2 and then made into nonparallel light beams. Then, the nonparallel light beams projected from the inverted real image systems 11-13 are made to cross one another in the space and the inclinations of the reflecting mirrors provided at points A3-C3 are set properly to guide the light beams onto an image surface 2 as parallel light beams having different intervals from the parallel light beams projected from the body surface 1. Consequently, the intervals of the parallel light beams are varied according to projection magnification to easily optional projection magnification.
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