Apparatus for signalling the position of a point on a surface
US4022969A · kind A · utility
17Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1975 |
| Grant date | May 10, 1977 |
| Priority date | — |
| Expiry date | Sep 23, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0321
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for signalling the position of a point on a surface divided into a plurality of identical subsidiary areas includes primary transducer means operable to identify uniquely the subsidiary area in which the point is located, and secondary transducer means representing the sub-divisions of a single subsidiary area. The primary and secondary transducer means may each be represented by a rectangular matrix of light-emitting devices which may be scanned sequentially by scanning means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.