Title:
POSITION DETECTING UNIT
Document Type and Number:
WIPO Patent Application WO/2004/074780
Kind Code:
A1
Abstract:
An optical position detecting unit for detecting the position and speed of a motor, comprising a light emitting element (2) such as an LED working as a light source, a slit (1) for transmitting or reflecting an optical signal from the light emitting element (2) to produce a sinusoidal optical signal for position detecting, and a photodetector (3) such as a photodiode and a phototransistor for converting the sinusoidal optical signal into an electric signal, wherein the optical axis of the light emitting element (2) is tilted an angle Ѳ with respect to the slit (1) to reflect a light from a light source off the reflection surface made of a reflection material of the slit (1), and the reflected light is converted into an electric signal by the photodetector (3) tilted an angle -Ѳ to obtain a reference signal, at the same time, a light passed through the transparent surface of the slit (1) is converted into an electric signal by the photodetector (4) tilted an angle Ѳ to obtain a phase-reversed reversed signal, whereby improving a noise resistance.
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Inventors:
HISATSUNE MASAKI (JP)
Application Number:
PCT/JP2004/002047
Publication Date:
September 02, 2004
Filing Date:
February 20, 2004
Export Citation:
Assignee:
YASKAWA DENKI SEISAKUSHO KK (JP)
HISATSUNE MASAKI (JP)
HISATSUNE MASAKI (JP)
International Classes:
G01D5/347; G01D5/36; (IPC1-7): G01D5/36
Foreign References:
| JPS6425010A | 1989-01-27 | |||
| JP2001004647A | 2001-01-12 | |||
| JPS55181224U | 1980-12-26 |
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