Measuring scale coding system for length or angle measuring instruments
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United States of America Patent
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Oct 20, 1987
Grant Date -
N/A
app pub date -
Jul 17, 1985
filing date -
Jul 25, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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