Reader and/or writer apparatus, power feeding system, and communication system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 27, 2001
Grant Date -
N/A
app pub date -
Jun 19, 1998
filing date -
Jun 20, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully