Rotation direction detecting apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Sep 16, 2003
Grant Date -
Nov 28, 2002
app pub date -
Apr 30, 2002
filing date -
May 22, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotation direction detecting apparatus including: a turntable 4 mounted on a rotary shaft 3 of a motor 2 and provided with a predetermined signal pattern, the predetermined signal pattern being formed so that reflection of light and non-reflection of light are repeated alternately and continuously by rotation of the motor 2; a photo-detector 5 for detecting the signal pattern of the turntable 4; and a micro-computer 7. The signal pattern is set as a pattern in which high-level regions and low-level regions are repeated alternately at a 2:1:1:2 ratio. The micro-computer 7 judges that the motor 2 is rotating in a direction of normal rotation when leading edges of the signal pattern detected by the photo-detector 5 are arranged at regular intervals, and judges that the motor 2 is rotating in a direction of reverse rotation when leading edges of the signal pattern detected by the photo-detector 5 are arranged at irregular intervals.
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