Light beam scanning apparatus
US6639620B2 · kind B2 · utility
7Cited by
2References
64Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 5, 2001 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Nov 13, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light beam is scanned in the main scanning direction on a scanned face. The light beam is detected by a pair of sensors arranged on the scanned face or a position equivalent thereto and is converted to an electric signal. A processing circuit having a plurality of operational amplifiers corrects electric signals from the pair of sensors based on a correction signal and integrates a difference between these electric signals. A correction amount of the correction signal is set based on a value integrated by the processing circuit and an offset amount present in the processing circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.