Encoder, motor with encoder, and servo system having a plurality of light receiving array to receive light reflected by slit tracks comprising incremental patterns and absolute pattern

摘要

An encoder includes a plurality of slit tracks, a point light source, a first light-receiving array, a second light-receiving array, and a third light-receiving array. The plurality of slit tracks respectively comprises a plurality of reflection slits arranged along a measurement direction. The point light source is configured to emit diffusion light to the plurality of slit tracks. The first light-receiving array is configured to receive light reflected by the slit track comprising an incremental pattern. The second light-receiving array is configured to receive light reflected by the slit track comprising an incremental pattern longer in pitch than other incremental patterns. The third light-receiving array is configured to receive light reflected by the slit track comprising an absolute pattern.

主权项

1. An encoder, comprising:
a plurality of slit tracks that respectively comprise a plurality of reflection slits arranged along a measurement direction; a point light source configured to emit diffusion light to the plurality of slit tracks; a first light-receiving array configured to receive light reflected by the slit track comprising an incremental pattern; a second light-receiving array configured to receive light reflected by the slit track comprising an incremental pattern longer in pitch than other incremental patterns; and a third light-receiving array configured to receive light reflected by the slit track comprising an absolute pattern, and wherein the first light-receiving array and the second light-receiving array are disposed at positions further on a direction side where the point light source is disposed rather than where the third-light receiving array is disposed.