Optical scanner
US4084188A · kind A · utility
15Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1976 |
| Grant date | Apr 11, 1978 |
| Priority date | — |
| Expiry date | Nov 15, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/029
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical scanner is disclosed for scanning a three-dimensional object or a two-dimensional document located in a space which is open and exposed to ambient light. Light from a laser is directed through a beam splitter and a deflector to the object or document, from which it is reflected back through the deflector, and from the beam splitter through a narrow-band optical interference filter to a photodetector. The laser light is modulated at a carrier frequency rate, and the electrical signal from the photodetector is demodulated to produce a video signal free of disturbances due to ambient light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.