| 摘要 |
PURPOSE: To control the variation of optical path length easily by disposing a rotary means at a position separated by a predetermined distance from the central axis of a corner cube prism formed to reflect an incident luminous flux back to an incident optical path and turning the rotary shaft of a rotary board while inclining a predetermined angle. CONSTITUTION: A corner cube prism 11 is fixed, at the bottom part thereof, to a board 12 coupled with the rotary shaft 14 of a motor 13. The corner cube prism 11 comprises three internal reflection prism faces making an angle of 90 deg. each other wherein the incoming face and outgoing face are set normal to the diagonal of cube so that the incident light is reflected on three faces and returned back to the incident optical path. The corner cube prism 11 is bonded with the central axis thereof being shifted by a distance (d) from the center of rotation of the board 12. Consequently, the optical path length can be varied by 4d.sinθ.
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