Displacement signal output device

Details Displacement signal output device Displacement signal output device

1991-12-03

1993-08-03

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

356374, 250237G, 33707, G01B 1100

Patent

active

052334074

ABSTRACT:
The invention provides a thin-profile displacement signal output device. The device comprises a first member having a periodic pattern consisting of alternating high-transmittance and low-transmittance regions, a second member having a periodic pattern consisting of alternating high-reflectance regions, a light emitting source for emitting a detection light beam and a light-receiver for receiving the reflected light, the first member and second member facing each other and spaced apart by a distance which is smaller than the pitch of the periodic pattern, the light-emitting source and light receiver means being both disposed on one side of said first member which is opposite to the side on which said second member is disposed, and the first and second member being displaceable relative to each other.

REFERENCES:
patent: 2948890 (1960-08-01), Barth et al.
patent: 3214751 (1965-10-01), Johnson
patent: 3344700 (1967-10-01), Brake
patent: 4176276 (1979-11-01), Kaul et al.
patent: 4654523 (1987-03-01), Tanaka et al.
patent: 4684257 (1987-08-01), Hanaoka et al.
patent: 4843237 (1989-06-01), Michel

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