Optical wheel, rotary encoder, linear encoder and method for generating a zeroing signal of a rotary encoder

摘要

A rotary encoder and an optical wheel for the rotary encoder are provided. The rotary encoder further includes a light source module, a code plate and an optical sensor module. The light source module is coupled with the code plate. The optical wheel is rotary, and has imaging elements arranged annularly; at least one of the imaging elements is coupled with the code plate. The optical sensor module is coupled with at least one of the imaging elements. The light source module emits lights to the code plate, and the lights passing through the code plate forms an image which is then transmitted to the optical sensor module via the imaging element. When the optical wheel rotates, the image moves accordingly. The optical sensor module senses that the image moves. A method for generating a zeroing signal of a rotary encoder and a liner encoder are also provided.

主权项

1. A rotary encoder, comprising:
a light source module, disposed fixedly in the rotary encoder for emitting light; a code plate, disposed fixedly in the rotary encoder and optically coupled with the light source module, wherein the code plate has a plurality of light transmitting regions alternating with a plurality of light non-transmitting regions for forming an image with a plurality of bright stripes and a plurality of dark stripes by the light passing through the code plate; an optical wheel, comprising a wheel body having a rotation axis and a plurality of imaging elements disposed fixedly on the wheel body and arranged annularly around the rotation axis, wherein each of the imaging elements has a focal point, wherein the wheel body is pivotally disposed in the rotary encoder, and at least one of the imaging elements is optically coupled with the code plate for enlarging the image; and an optical sensor module, disposed fixedly in the rotary encoder and optically coupled with at least one of the imaging elements for being irradiated by one of the bright stripes of the enlarged image.