Reflection encoder, servo motor, and servo unit

摘要

Reflected light can be effectively utilized by increasing a light receiving area. Incremental light receiving element groups are separated and arranged in the circumferential direction of a rotating unit while placing a light source therebetween. First and second absolute light receiving element groups are arranged at both sides of the outside and inside of the light source in the radial direction of the rotating unit. As a result, first and second absolute light receiving elements are continuously arranged, and also the incremental light receiving element groups and the absolute light receiving element groups can be arranged to surround the periphery of the light source from four directions.

主权项

1. A reflection encoder comprising:
a rotating unit configured to be rotatably arranged around a rotating shaft center and on which an incremental pattern is formed along a circumferential direction; and a board configured to be arranged opposite the rotating unit, and the board comprising:
a light source configured to emit light toward the rotating unit; andan incremental light receiving element group configured to include a set including a plurality of incremental light receiving elements for receiving reflected light from the incremental pattern, the incremental light receiving elements of the set being separated and arranged in a line on the board in the circumferential direction of the rotating unit while placing the light source therebetween, wherein the incremental light receiving elements in the set respectively detect signals having corresponding phases in one period whose values increase sequentially.