Optical encoder, motor driver and image forming apparatus
US7532370B2 · kind B2 · utility
18Cited by
1References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 2, 2003 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | Oct 30, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04791
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical encoder includes a light emitting unit that emits parallel light onto a plurality of marks that are arranged on an object such as a rotor or a belt, at a predetermined interval in a moving direction of the object, and a light receiving unit that receives light modulated by the marks. The parallel light is generated by a collimating lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.