Automatic coordinate determining device
US4088842A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1976 |
| Grant date | May 9, 1978 |
| Priority date | — |
| Expiry date | May 21, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/004
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for detecting position coordinates of patterns such as graphs and characters which are plotted on a drawing media. The device includes a tablet on which a plurality of conductive lines are installed parallel to each other, and a probe positionable for selecting a position coordinate. The probe comprises circular coils which are in a mutual inductive relation with the conductive lines. The device determines the coordinate of the probe relative to the tablet by selecting and filtering a mixed signal which is produced when scanning signals are applied to the conductive lines to induce signals in the probe coils. A wireless probe and a plurality of probes can be used on one tablet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.