| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical encoder which can decrease wraparound components and crosstalk toward a light receiving element and has stable phase difference by eliminating wiring overlap. SOLUTION: A periodic light intensity distribution pattern having a certain pitch (P) is generated by irradiating an emitted light from a light source (102) to a scale (104). A plurality of light receiving element groups which is a group in which a plurality of light elements having the same phase are located to be adjacent to each other and change their position according to the scale are provided. The light receiving element groups are arranged in a line. Each light receiving element group has a certain phase difference. A centroids of areas (28, 29; 38, 39) on the phase axis for the light receiving element groups in which the phase differences thereof have certain relationships with each other are made to agree. COPYRIGHT: (C)2004,JPO&NCIPI
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