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US 2006/0138235 A1Published application
Optical encoder
AssigneeLite-On Technology Corporation
InventorChih-Hsien Wei
Life of this patent
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Abstract
An optical encoder is disclosed, in particular, which has a light sensing element with light-sensing cells arranged in a matrix. The light sensing element repeatedly detects the same reflective light beam by different rows of light-sensing cells to increase the precision of feedback control. Furthermore, since the light sensing element synchronously and repeatedly receives the reflective light beam, the reliability of detected signals is increased.
Claims11
An optical encoder, comprising:
- a light source, which emits light;
- a code strip, which has reflective regions and non-reflective regions which are staggered, wherein the reflective regions reflect the light from the light source to produce reflective light beam;
- a first lens set, which is disposed on the same side of the code strip as the light source, and which converges the light beam and transmits the converged light beam;
- and
- an light sensing element, which has a plurality of light sensing cells arranged in a matrix, and which receives the light beam converged by the first lens set and converts the received light beam into an electrical signal, thereby obtaining a binary identification code, wherein the light sensing element is opposite to the code strip and installed on another side of the first lens set.
2 more elements
Dependencies are inferred from the claim text.