Multi-track optical encoder
AssigneePixArt Imaging (Penang) SDN. BHD.
InventorSAI-MUN LEE
Life of this patent
Estimating the term…
Abstract
There is provided an optical encoder including an encoding medium, a substrate, a light source and a light sensor. The encoding medium includes an index track and a position track. The light source is arranged at a first surface of the substrate to emit light toward the index track and the position track. The light sensor is arranged at a second surface of the substrate, and has a first light sensing region and a second light sensing region for receiving reflective light respectively from the index track and the position track.
Claims20
An optical encoder, comprising:
- an encoding medium, comprising a first track and a second track;
- a substrate, having a first surface and a second surface opposite to each other, wherein the first surface faces the encoding medium;
- a light source, arranged at the first surface of the substrate, and located at a position to uniformly illuminate the first track and the second track;
- and
- a front side illuminated (FSI) sensor, arranged at the second surface of the substrate, and having a first light sensing region and a second light sensing region configured to receive reflective light respectively from the first track and the second track.
An optical encoder, comprising:
- an encoding medium, comprising a first track and a second track;
- a substrate, having a first surface and a second surface opposite to each other, wherein the first surface faces the encoding medium;
- a light source, arranged at the first surface of the substrate, and located at a position to uniformly illuminate the first track and the second track;
- and
- a backside illuminated (BSI) sensor, arranged at the second surface of the substrate, and having a first light sensing region and a second light sensing region configured to receive reflective light respectively from the first track and the second track.
An optical encoder, comprising:
- a code disk, comprising a first track and a second track arranged along a radial direction of the code disk;
- a substrate, having a first surface and a second surface opposite to each other, wherein the first surface faces the code disk;
- a light source, arranged at the first surface of the substrate, and located at a position to uniformly illuminate the first track and the second track;
- and
- a light sensor, arranged at the second surface of the substrate, and having a first light sensing region and a second light sensing region configured to receive reflective light respectively from the first track and the second track.
Dependencies are inferred from the claim text.