Method for detecting a reference angular position of a rotary body
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United States of America Patent
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Mar 6, 1990
Grant Date -
N/A
app pub date -
Mar 14, 1988
filing date -
Oct 27, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of detecting a reference angular position of a rotary body. Two detectable portions are spaced apart from each about the periphery by a predetermined angle in the rotational direction thereof. Two detection signals and produced from two detectors spaced apart from each other by the same angular distance as the detectable portions in the rotational direction of the rotary body in the vicinity of the locus of the detectable portions. It is first detected that at least one of the detectors produces a detection signal and thereafter it is determined that the rotary body takes a reference angular position when both of the detectors produce the detection signals.
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