Electrographic system
US4523654A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1983 |
| Grant date | Jun 18, 1985 |
| Priority date | — |
| Expiry date | Sep 14, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An electrographic system utilizing a transparent resistive layer which operates in conjunction with a stylus or cross hair cursor excited from an a.c. source to develop coordinate defining electrical signals. Through the utilization of a sequence of border switching arrays, the signals may be collected from the resistive surface in a predetermined sequence and submitted in serial fashion to the input of a signal treatment network. As a consequence, only one such network is required to effect operation of the system. The hand-held cursor is formed including a transparent disk carrying cross hairs which is excited from an a.c. source to very accurately locate coordinate positions upon the resistive surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.