| 摘要 |
PROBLEM TO BE SOLVED: To prevent displacement when the position is fixed after positional adjustment of an optical element and also allow repeated fine adjustment thereof. SOLUTION: A cylindrical cushioning member 12 made of a satisfactorily slidable material such as a PEFE is disposed within a fixed screw hole 1c one end of which communicates with a screw hole 1a, and between the side face of the screw portion 2a of an adjustment screw 2 and the leading end face of a fixed screw 11. By tightening the fixed screw 11 after adjusting the position of an optical element 3 by rotating the adjustment screw 2, the leading end of the fixed screw 11 presses the cushioning member 12 such that the cushioning member 12 is pressed against the screw portion 2a of the adjustment screw 2 and consequently elastically deformed. The adjustment screw 2 is fixed by the elastic force exerted by the pressing force. By untightening the fixed screw 11, the pressing force of the cushioning ember 12 is released so that the adjustment screw is freely rotated. As a result, the cushioning member 12 returns to its original shape. COPYRIGHT: (C)2007,JPO&INPIT
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