CPC G01D 5/366 (2013.01) [G01D 5/2457 (2013.01); G01D 5/3473 (2013.01); G01D 18/00 (2013.01)] | 20 Claims |
1. An optical encoder, comprising:
an optical sensor, configured to receive modulated light from an encoding medium, and comprising:
a detection photodiode array, arranged opposite to the encoding medium, and photodiodes of the detection photodiode array are periodically arranged along a direction by a distance; and
a first photodiode and a second photodiode, respectively arranged at two sides of the detection photodiode array in the direction, each of the first photodiode and the second photodiode having a trapezoid sensing surface, and separated from the detection photodiode array by three times of the distance in the direction.
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