Signal generator for raster type scanners
US4100408A · kind A · utility
4Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 2, 1977 |
| Grant date | Jul 11, 1978 |
| Priority date | — |
| Expiry date | Mar 2, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04746
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A signal generating apparatus driven by the reference beam of an image scanning system is disclosed. The apparatus includes an apertured codeplate across which the reference beam sweeps, light from the beam triggering a photodetector to produce a signal pulse output. A grating is inserted into the beam path to split the reference beam into a plurality of spaced apart beams effective to offset blockage or irregularity of one or more of the codeplate apertures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.