Measuring scale coding system for length or angle measuring inst

Details Measuring scale coding system for length or angle measuring inst Measuring scale coding system for length or angle measuring inst

1985-07-17

1987-10-20

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

33125C, 340347P, G01D 534

Patent

active

047016159

ABSTRACT:
A system for distinguishing identical reference marks located on a graduation used in an instrument for measuring the relative position of two objects. An individual code mark, comprised of multiple code mark elements, is allocated to each reference mark. Each code mark element can occupy one of two possible locations. A binary number associated with each code mark is obtained during scanning of the reference marks and code mark elements. The binary number is generated from a stored raster by a decoding unit and is dependent upon the position of each code mark element, the spacing between adjacent code mark elements and the spacing between the reference mark and an adjacent code mark element.

REFERENCES:
patent: 3982106 (1976-09-01), Stutz
patent: 4074258 (1978-02-01), Dore et al.
patent: 4403859 (1983-09-01), Ernst
patent: 4412745 (1983-11-01), Ohtomo et al.
patent: 4491928 (1985-01-01), Reichl
patent: 4519140 (1985-05-01), Schmitt
patent: 4602242 (1986-07-01), Kimura

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