| 摘要 |
PURPOSE:To make light beams deflected by a 1st deflecting means incident upon a same position of the 2nd deflecting means by arranging an image forming optical system between two one-dimensional deflecting means for deflecting light beams in different directions. CONSTITUTION:A condenser lens L to be an image forming optical system is arranged between the 1st and 2nd deflecting means D1, D2 so that the deflecting center of the 1st means D1 and that of the 2nd means D2 have image relation each other. In said constitution, light beams B can be made incident upon almost the same position of the mirror surface of the 2nd means D2 independently of deflection based upon the 1st means D1. In addition, the equivalent deflection center of the 1st means D1 can be made to coincide with an incident position to the 2nd means D2, i.e. the deflection center of the 2nd means D2, in case of observing these deflection centers from a light beam projection space.
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