公开(公告)号：EP3922955A1

公开(公告)日：2021-12-15

申请号：EP21762583.9

申请日：2021-03-09

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

发明人： OGATA, Kazunari ,  KIMURA, Shougo ,  FUNATSU, Kaori

IPC分类号： G01D5/347 ,  H02K11/22

摘要： The range of operating angles of a position transducer is widened, and its signal-to-noise ratio is improved. The position transducer includes a light source and a detector including at least one pair of photodiodes (PDs) disposed on a predetermined circle. The detector receives light emitted from the light source to output a signal varying depending on the areas of regions where the light is received on two PDs forming a pair. The PDs are formed on separate chips, respectively, and the chips are disposed on a substrate so that one or more pairs of PDs surround the entirety of a predetermined region and have an annular shape as a whole.