Device for determining position coordinates of points on a surface
US4795858A · kind A · utility
10Cited by
1References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1988 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Apr 7, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/046
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A device for determining position coordinates of points on a surface, have a cursor structure, a grid structure, and a signal processor. The cursor structure has a cursor coil and a signal generator to impress a reference phase voltage to the coil. Voltages induced from the cursor coil in conductors of the grid structure are processed in the signal processor to produce a position dependent phase voltage. For the signal processor, reference phase pulses are obtained from a voltage induced in an auxiliary grid conductor provided in the grid structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.