Rotary encoder having absolute angle patterns and relative angle patterns
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United States of America Patent
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May 25, 1993
Grant Date -
N/A
app pub date -
Jan 14, 1991
filing date -
Jul 12, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a rotary encoder for detecting a rotational angle. A rotary encoder according to the present invention comprises a rotating body provided on its surface with a plurality of digital code patterns representative of absolute angle ranges and a plurality of relative angle patterns representative of relative angles, a high-order angle data producing means (1,2,5,7) for reading the absolute angle patterns to produce high-order angle data, and a low-order angle data producing means (1,2,5,7) for reading the relative angle patterns to produce low-order angle data. The rotary encoder according to the present invention ensures medium resolution by means of the digital code patterns and attains finer resolution by means of the relative angle patterns, whereby the rotational angle can be detected with superior resolution.
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