Opto-electronic scale reading apparatus

Details Opto-electronic scale reading apparatus Opto-electronic scale reading apparatus

1991-10-30

1993-02-02

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, H01J 314

Patent

active

051840146

ABSTRACT:
An opto-electronic scale reading apparatus comprises a light source (20) which projects light via an index grating (22) onto a reflective scale (10). Light is reflected from the scale (10), passes through an auxiliary grating (36) and is incident upon an analyser grating (28), at which a plurality of periodic light patterns are formed. Light from the light source (20) travels initially parallel to the scale plane, and is subsequently deflected through 90.degree. by a beam splitter cube (26); the light is thus incident upon and reflected and off the scale (10) at 90.degree. to the scale plane. This arrangement enables large movements of the readhead in a direction perpendicular to the scale.

REFERENCES:
patent: 4078314 (1978-03-01), McMurtry
patent: 4800547 (1989-01-01), Kessels et al.
patent: 5064290 (1991-11-01), McMurtry et al.

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