The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 08, 2004
Filed:
Mar. 21, 2000
Atsuo Yamaguchi, Hyogo, JP;
Other;
Abstract
A non-contact IC card system capable of improving the data transmission rate and communication range without considerably enlarging the frequency band of a signal to be put to use. An AM-modulated signal ( F) from a reader writer ( ) is received by a resonance circuit ( ) of an IC card ( ), and an IC card driving power source is produced therefrom in a rectifying section ( ). In addition, it is demodulated in an AM demodulating circuit ( ) and decoded in a decoder ( ), thereby presenting reception data ( ). On the other hand, when data ( J) is transmitted from the IC card ( ), a characteristic of a regulator ( ) for stabilizing an operating voltage of the resonance circuit ( ) is altered on the basis of a signal encoded in an encoder ( ) so that the signal is transmitted as an AM-modulated signal ( P) to the reader writer ( ).