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:
May. 10, 2005
Filed:
Nov. 12, 2003
Haruhiko Shigemasa, Yamatokoriyama, JP;
Yoshihiro Nakao, Ikoma, JP;
Haruhiko Shigemasa, Yamatokoriyama, JP;
Yoshihiro Nakao, Ikoma, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An electromagnetic coupling characteristic adjustment method for adjusting an electromagnetic coupling characteristic between a reader/writer device and an IC card which are used in a non-contact communication system in which a power transmission antenna coil provided in the reader/writer device and a power receiving antenna coil provided in the IC card are electromagnetically coupled so that the reader/writer device supplies power to the IC card without contact with the IC card. The power supply device includes adjustment impedance elements respectively connected in series and in parallel with the power transmission antenna coil. Impedances of these adjustment impedance elements are determined so that the semiconductor device receives greatest power when a power supply distance, which is a distance between the power transmission antenna coil and the power receiving antenna coil, has a predetermined value not less than 0. On this account, heat generation due to the difference of received power can be reduced with a simple structure.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile