Laser beam type distance measuring device

Details Laser beam type distance measuring device Laser beam type distance measuring device

1995-10-20

1997-07-15

Pham, Hoa Q.

Optics: measuring and testing

By polarized light examination

With light attenuation

356 501, 359216, G01B 1114, G01C 308

Patent

active

056488521

ABSTRACT:
A laser beam type distance measuring device comprises a laser beam emitter; a returning laser beam detector; a polygon mirror rotated about a first axis for reflecting a going laser beam from the laser beam emitter toward a remote object and reflecting a returning laser beam from the object toward a given optical track along which the returning laser beam travels to the returning laser beam detector; and a nodding mechanism for pivoting the polygon mirror about a second axis which is perpendicular to the first axis. These parts are housed in a case which has a window opening through which the going and returning laser beams pass. An outwardly swelled transparent cover covers the window opening in such a manner that a depressed inner surface thereof faces toward the polygon mirror in the case. A shielding plate is installed in the case near the polygon mirror to prevent the going laser beam from entering the given optical track.

REFERENCES:
patent: 5436728 (1995-07-01), Watanabe
patent: 5493388 (1996-02-01), Adachi

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