Mirror rotation angle detection mechanism

Details Mirror rotation angle detection mechanism Mirror rotation angle detection mechanism

1991-03-15

1992-07-21

Evans, F. L.

Optics: measuring and testing

Angle measuring or angular axial alignment

356375, 250234, G01B 1126

Patent

active

051317443

ABSTRACT:
A mirror rotation angle detection mechanism is provided for an optical system having a mirror which is rotatable about an axis substantially on a reflection surface thereof at which a main beam of light is reflected. The mirror has a thin reflective layer with opposite surfaces that are nearly coplanar, and one of which constitutes the main beam reflection surface. The detection mechanism includes a light emitting member to irradiate a beam of detection light onto the opposite surface of the reflective layer. A light receiving element recieves the reflected detection beam, and an angle detection circuit detects the rotation angle of the mirror in accordance with the output of the light receiving element. According to a preferred embodiment, a condenser lens may be arranged between the light emitting member and the detection beam reflection surface.

REFERENCES:
patent: 4694164 (1987-09-01), Noguchi

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