Incremental measuring instrument

Details Incremental measuring instrument Incremental measuring instrument

1978-12-20

1981-02-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01B 900

Patent

active

042530210

ABSTRACT:
An instrument for measuring the movement of a first object with respect to a second object is disclosed including a rotatable opaque disc mounted on the first object, which disc defines a plurality of translucent involute stripes proceeding from a base circle, a scale including a reflective grid pattern mounted on the second object, and an optical system for projecting an image of a portion of the grid pattern onto an image zone of the disc such that the stripes of the image of the grid are substantially perpendicular to a line drawn tangent to the base circle through the image zone.

REFERENCES:
patent: 2524807 (1950-10-01), Kallmann
patent: 2565745 (1951-08-01), Shalka
patent: 3153111 (1964-10-01), Barber et al.
patent: 3254226 (1966-05-01), Bobula et al.
patent: 3757128 (1973-09-01), Vermeulen
patent: 3935447 (1976-01-01), Black et al.
patent: 3950096 (1976-04-01), Aeschlimann et al.
patent: 4171160 (1979-10-01), Ernst

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