Reader and/or writer apparatus, power feeding system, and communication system
US6194993A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 19, 1998 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Jun 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A reader and/or writer apparatus, a power feeding system and a power feeding and communication transmission and/or reception system in a proximate wireless card system arranged so that power which satisfies the requirement of the Radio Law (500 .mu.V/m at a distance of 3 m from the reader and/or writer apparatus) regarding the radiated electric field is supplied sufficiently from the reader and/or writer apparatus to the proximate wireless card (IC card). The reader and/or writer apparatus has a spirally shaped or coil-shaped antenna for generating electromagnetic fields both to supply operational power to an IC card and to perform transmission and/or reception of signals for communication to and/or from the IC card and a conductor member for forming a mirror image of the antenna on its back side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.