Rotation sensor using a radiation emitter and detector and a duty cycle feedback loop
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United States of America Patent
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Mar 31, 1998
Grant Date -
N/A
app pub date -
Jun 29, 1996
filing date -
Oct 5, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rotation sensor (5) comprises a fixed member (10) and a rotatable member (20). The fixed member (10) contains a radiation emitter (40) which emits radiation along a path (35). The rotatable member (20) rotates about an axis (65) substantially perpendicular to the path (35) and has a head containing slots (25) arranged to periodically transmit and block the radiation emitted by the emitter (40). The fixed member (210) also has a radiation detector (50) which detects radiation transmitted by the slots (25) of the rotatable member (20). Thus, the rotational movement of the rotatable member (20) with respect to the fixed member (10) is sensed by the frequency of the radiation detected by the radiation detector (50).
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