| 摘要 |
PURPOSE:To easily execute an attaching/detaching operation by locating a mirror block by pressing it to 1st and 2nd reference surfaces with a flat spring and a cover plate at the time of mounting the mirror block, which is freely attached and detached, in the recessed part of a lens block. CONSTITUTION:The mirror block 28, which can be freely attached and detached from upward to the recessed part 26 formed on the lens block 4, is constituted of cubes and apertures 28c and 28d are respectively formed on the front surface of 28a of an image formation lens 3 side and on the lower surface 28b of an aperture gate 25B side and a reflecting mirror 27 is arranged with 45 deg. and fixed with the flat spring 51. A knob 56 is mounted on the upper surface 28e of the mirror block 28 and the flat spring 57 for locating is mounted on the front surface 28a of the mirror block 28. And the width of the spring 57 is set a little wider than the width of the mirror block 28 and grooves 26a and 26a in which both end parts of the flat spring 57 are inserted are formed in the recessed part 26 of the lens block 4. By inserting the flat spring 57 of the mirror block 28 in the insertion grooves 26a of the recessed part 26 so as to mount, the direction at the tie of attaching the block 28 can not be mistaken.
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