Single channel encoder with specific scale support structure

Details Single channel encoder with specific scale support structure Single channel encoder with specific scale support structure

1987-06-01

1988-11-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, 356375, 341 13, G01B 1114

Patent

active

047868031

ABSTRACT:
The single channel encoder comprises a transparent scale in which the scale divisions are defined by transverse opaque lines having a width greater than the width between the opaque lines. An emitter holder and a detector holder snap together, clamping an aperture plate there between. The aperture plate has a slit therein which is disposed in the optical path between the emitter and the detector. Projections functioning as scale supports on the opposite sides of the emitter holder and the detector holder are disposed in longitudinally spaced positions and define a gap therebetween for engaging the outside edges of the encoder scale outside of the opaque transverse lines to precisely position the scale in the optical path for maintaining a constant gap between the encoder scale and the aperture plate.

REFERENCES:
patent: 4359636 (1982-11-01), Stauffer
patent: 4387300 (1983-06-01), Dudash et al.
patent: 4477726 (1984-10-01), Reichl
patent: 4564294 (1986-01-01), Ernst
patent: 4587418 (1986-05-01), Shirakoshi et al.
patent: 4704524 (1987-11-01), Masaki et al.

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