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    POSITION TRANSDUCER
    2.
    发明公开
    POSITION TRANSDUCER 有权
    位置转换器

    公开(公告)号：EP2835617A1

    公开(公告)日：2015-02-11

    申请号：EP13849910.8

    申请日：2013-10-25

    申请人： Citizen Chiba Precision Co. Ltd. ,  Citizen Holdings Co., Ltd.

    发明人： SATO, Hideaki ,  OGATA, Kazunari ,  OHTA, Naoki ,  MORITAKU, Asuka ,  TAKEDA, Tomonori

    IPC分类号： G01D5/347

    CPC分类号： G01D5/3473 ,  G01D3/036 ,  G01D5/30 ,  G01D5/341 ,  G01D5/34715

    摘要： 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.