| 摘要 |
In a photoelectric absolute encoder including a scale(10) having a plurality of tracks (11-13) with different pitch patterns, and a detector (20) having a light source and light receiving elements including a plurality of light receiving element arrays (21-23) corresponding to the plurality of tracks (11-13), a light receiving element array (22') is additionally arranged at a position in the detector (20) corresponding to a boundary between the track having a pattern with a wide pitch and the track having a pattern with a narrow pitch adjacent to each other in the scale, and displacement of the detector (20) relative to the scale (10) in a lateral direction is detected from a signal amplitude (Iamp) of the added light receiving element array (22'). In this manner, displacement of the detector (20) relative to the scale (10) in the lateral direction can be detected. |
