Apparatus for detecting galvonmeter mirror movement of optical d

Details Apparatus for detecting galvonmeter mirror movement of optical d Apparatus for detecting galvonmeter mirror movement of optical d

1993-06-01

1995-09-19

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, 369 4414, 359221, G01D 530

Patent

active

054517753

ABSTRACT:
A mirror movement detecting device includes a pivotable mirror, a pivotable mirror support member, a pivotable mirror drive unit, a reflecting plate secured to the pivotable mirror, a photo-sensing unit including a light emitting diode and two photosensors disposed in the vicinity of the reflecting plate, and a detecting circuit for controlling the light output detecting an output from the photo-sensing unit. Rays of light from the photo-sensing unit are reflected by the reflecting plate movable together with the pivotable mirror to provide the reflected light, the reflected light power is controlled by the photo-sensor output, the amount of which or a change in amount of which is subsequently detected to provide an indication of the amount of movement of the pivotable mirror at a high sensitivity and without accompanying an increase in mass of the pivotable mirror.

REFERENCES:
patent: 4152588 (1979-05-01), Klah et al.
patent: 4330880 (1982-05-01), Van Dijk
patent: 4348939 (1982-09-01), Hipp
patent: 4423496 (1983-12-01), Opheij et al.
patent: 4466088 (1984-08-01), Trethewey
patent: 4556964 (1985-12-01), Trethewey
patent: 4564757 (1986-01-01), LaBudde et al.
patent: 4589102 (1986-05-01), Volleau et al.
patent: 4736353 (1988-04-01), Kasai et al.

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