Position transducer
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United States of America Patent
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Aug 4, 2015
Grant Date -
Jun 4, 2015
app pub date -
Oct 25, 2013
filing date -
Oct 26, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Provided is a position transducer which can be manufactured at low cost, improve the signal-to-noise ratio of an output obtained from a detector, and obtain a stable output even if the temperature changes. A position transducer 100 includes a butterfly-shaped reflector 7 attached to a rotating shaft 2 of a rotation restriction motor 1, an LED die 4 disposed to face a central portion of the reflection surface of the reflector 7, a diffused-light absorbing member disposed on the surfaces of a diffused light absorber 3 and a case 5, installed on the fixed side of the motor 1 so as to surround the reflector 7 with a distance from the reflector 7 at the rear of the reflector 7 as viewed from the LED die 4 and absorbing illumination light from the LED die 4 which has not illuminated the reflection surface, and detectors 11 mounted on the same printed circuit board 6 as the LED die 4 to detect an image reflected by the reflector 7.
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