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:
Sep. 23, 2003
Filed:
Jun. 09, 1999
Rohm Co., LTD, Kyoto, JP;
Abstract
In a non-contact IC card, a driving portion sequentially switches a resonance frequency of a resonance circuit . A reference voltage generating portion receives an output voltage of resonance circuit for outputting a prescribed reference voltage. An output value measuring portion measures a magnitude of the output voltage of resonance circuit at each resonance frequency using the reference voltage as a reference. An output value storing portion stores a measurement value (an output value). A manner determining portion selects the largest one of the output values stored in output value storing portion , and determines a switching manner corresponding thereto as a suitable switching manner. Thus, the suitable switching manner allowing the most efficient power supply can be achieved.