Information card system
US5175418A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1990 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Dec 14, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10326
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An information card system operating in a non-contact manner comprises an information card including a data storage, a card reader and a card writer. The card writer writes information data, such as an identification code, on the card. The card reader sends an interrogation or response requiring signal to the card, and the card responds thereto witha signal containing its information data. The card has a pair of electrode plates adapted for static coupling with a pair of electrode plates included in the card writer. The card's electrode plates alternatively can act as a dipole antenna. The card additionally has a loop shaped electrode pattern for communicating with the card reader. The loop shape permits the pattern to modulate a magnetic field generated by the reader. The size of the loop shaped electrode pattern permits it to alternatively act as an antenna.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.