Light beam scanning apparatus with multiple sensors and patterns
US6509921B2 · kind B2 · utility
10Cited by
1References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2001 |
| Grant date | Jan 21, 2003 |
| Priority date | — |
| Expiry date | Apr 5, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Two sawtooth sensor patterns are combined so that they engage with each other. These sensor patterns are arranged so that a light beam passes sawtooth portions in a horizontal scan direction. A light beam's scan position is determined by integrating a difference between output signals from these sensor patterns. It is possible to provide a highly sensitive circuit for processing signals from the sensors and to improve detection accuracy for light beams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.