Two dimensional light beam selection system
US4205304A · kind A · utility
35Cited by
7References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1977 |
| Grant date | May 27, 1980 |
| Priority date | — |
| Expiry date | Sep 22, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0421
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A position selection system comprising a map of a plurality of selection positions arranged in columns and rows with a normally unenergized light emitter and a respective normally disabled light detector positioned at opposie ends of each of the columns and rows. The light emitters are sequentially energized and the respective light detectors are synchronously sequentially enabled to thereby avoid the necessity of collimating light from the light emitters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.