| 摘要 |
A photoelectric encoder has a scale 10 in which a main track 14 for detecting an amount of movement is formed in a measuring direction. The photoelectric encoder includes an origin signal generating portion (14a, 54a, 60, 64) provided at a part of the main track 14 in a direction orthogonal to the measuring direction. Thereby, change in a light receiving signal due to passage of the origin signal generating portion is detected to generate an origin signal. Thus, the origin signal which is in agreement with a main signal in phase is obtained and improve the reproducibility of an origin position. |
