Optical scanner having multiple, simultaneous scan lines with different focal lengths
US4591242A · kind A · utility
65Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Feb 13, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical scanner uses frequency modulation and detection techniques to produce and utilize multiple, simultaneous scan patterns in which corresponding scan lines have different focal lengths. Two or more solid state lasers are modulated at unique frequencies. The frequency modulated output beams pass through different combinations of focusing lenses and are deflected by a single beam deflecting apparatus. Light reflected from any scanned object is detected. The resulting multi-frequency signal is applied to a plurality of bandpass filters to separate the returned signal into a plurality of separately decodable signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.