| 摘要 |
PURPOSE:To prevent the loss of a mirror block by housing the mirror block in a shading cover which blocks a 2nd aperture at the time of inserting a lens block in a 1st aperture of a 2nd unit when a mirror is not mounted and blocking the 1st aperture with the shading cover at the time of inserting the lens block in the 2nd aperture of the 2nd nit when the mirror is mounted. CONSTITUTION:The mirror block 28 is housed in the shading cover 64 which blocks the 2nd aperture 63 at the time of inserting the lens block 4 in the 1st aperture 62 of the 2nd unit 8 when the mirror block 28 is not mounted and the shading cover 64 blocks the 1st aperture 62 at the time of inserting the lens block 4 in the 2nd aperture 63 of the 2nd unit 8 when the mirror block 28 is mounted. Since the mirror block 28 can be housed in the shading cover 64 when it is not mounted, the loss of the mirror block 28 can be prevented from occurring.
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