Angle detection device for rotational body
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United States of America Patent
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-
Apr 11, 2006
Grant Date -
Mar 10, 2005
app pub date -
Aug 27, 2004
filing date -
Sep 9, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In an angle detection device for a rotational body, an external peripheral surface of an arc-shaped fluorescent fiber is scanned by a scanning beam from a scanning mirror fixed to the rotational shaft of a swing motor. Fluorescence is generated at a position in the fluorescent fiber scanned by the scanning beam, the fluorescence is propagated to both ends thereof, and the received luminous energy corresponding to the scanning position is detected by photodiodes. A signal processing circuit compares output signals of the photodiodes to obtain the scanning position of the scanning light, and the corresponding rotation angle of the swing motor is found.
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