| 摘要 |
An optical axis adjuster 7 is provided to change the optical axis direction of a transmitter unit having a transmitter element 65. A restriction member 9 is latched in an external thread 71 which is formed in the outer circumferential surface of the adjuster 7. The adjuster 7 is held by a rotation/revolution support member 74 and rotatable around its central axis O. The rotation/revolution support member 74 is rotatable around a rotation axis 8 extending perpendicularly to the central axis O. Stepped adjustment of the optical axis is effected by revolving the adjuster 7 around the revolution axis 8 such that the restriction member 9 climbs over a thread ridge. Stepless adjustment of the optical axis is conducted by moving the adjuster 7 in cooperation with its rotation around the central axis O, with the restriction member 9 keeping a latched engagement with a thread groove.
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