| 摘要 |
PURPOSE:To facilitate the assembly of a driving mechanism, to obtain good deviation reproducibility and deviation of proper extent, and to eliminate curvature of field by reflecting luminous flux which is passed through the peripheral part of parallel plane transmission member to the peripheral part of the transmission member. CONSTITUTION:The parallel luminous flux from a laser beam source 1 is converged by an optical image formation system 2 and displaced (h) by passing through the peripheral part 7a of a halving glass 7. The halving glass 7 is rotated around a rotating shaft 6 while its transmission surface is slanted by an angle theta, the intersection of the luminous flux passed through the peripheral part 7a of the halving glass 7 and a surface perpendicular to the optical axis 20 draws a circular track. The luminous flux passes through the peripheral part 7a is reflected twice by reflecting mirrors 81 and 82 to return the peripheral part 7a of the halving glass 7, and the luminous flux is displaced by the halving glass 7 as well as on the forward path. Namely, the luminous flux passed through the peripheral part 7a of the halving glass 7 draws a linear reciprocal track on the return path and its amplitude is 2h.
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