| 摘要 |
PURPOSE:To enable the quick changing in the set angle of pipes by providing an opening-closing mechanism which opens and closes two pipes through which an incident light beam and the reflected light beam thereof passes symmetrically and equally to the normal. CONSTITUTION:An annular mirror 2 is fixed with a pedestal to the top end part 1a of a base 1, and a light beam 6a on the axial line 5a at the internal center passes through a pipe 4a, and is made incident to the mirror 2. A light beam 6b reflected by the mirror 2 passes through a pipe 4b. Both pipes 4a, 4b are supported respectively by arms 7a, 7b, and a stanchion 8 is provided in the central part in the mirror 2. An opening-closing mechanism 9 consists of a slider 10 provided to the stanchion 8 and links 11a, 11b connecting the slider 10 and the arms 7a, 7b. Both pipes 4a, 4b are opened and closed symmetrically with the links 11a, 11b by said mechanism 9. |
