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:
Nov. 03, 1998
Filed:
Aug. 01, 1997
Applicant:
Inventor:
Atsuo Yamaguchi, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
235492 ; 235439 ; 34082534 ; 34082554 ;
Abstract
A non-contact IC card includes an antenna resonance circuit including two output terminals; and a phase locked loop (PLL) for receiving, as an input signal, a signal representative of a received signal received by the IC card and changing to a negative state, and for producing an output tuned to the input signal, wherein, for phase modulation or demodulation, an output signal for half a period is produced as the output of the PLL and both terminals of an antenna resonance circuit are short-circuited during the half period from a zero crossing point of the input signal.