| 摘要 |
PURPOSE:To eliminate risk of the bus line of an optical component inclining relative to the reference line even in case an impact is applied to the optical component such as a cylindrical mirror. CONSTITUTION:The lower two surfaces of one end of a cylindrical mirror 43 are contacted with two reference surfaces 125, 126 of the butting part 122 of a body chassis 125, while the upper two surfaces are pressurized by the pressurizing parts 134, 135 of a holding member 131. A slipoff stopper 138 is provided at the end of the insertion part 132 in such an arrangement as hitched at the bottom of the butting part 122. The other end of the cylindrical mirror 43 is held in the same manner. Because the butting part 122 is located on the extension line in the moment direction of two reactive forces generated when the parts 134, 135 make pressurization, the holding of the mirror 43 can be made well balanced, and it can return to the original position after eventual movement of the position caused by impact, etc. |
