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:
Oct. 18, 2005
Filed:
Aug. 20, 2003
Hiroshi Yoshigi, Hinode, JP;
Takehiro Ookawa, Tachikawa, JP;
Tadashi Oonishi, Musashimurayama, JP;
Kazuki Watanabe, Kokubunji, JP;
Hiroshi Yoshigi, Hinode, JP;
Takehiro Ookawa, Tachikawa, JP;
Tadashi Oonishi, Musashimurayama, JP;
Kazuki Watanabe, Kokubunji, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
For obtaining an IC card low in both power consumption and manufacturing cost, operating conditions in case of going through a contact point, which conditions are associated with supply voltage and signal level in an internal circuit, are to lie within operating conditions in case of going through an antenna. To this end, an IC chip of the IC card is provided with a voltage conversion circuit for lowering a supply voltage supplied through the contact point and a level conversion circuit for lowering the level of a signal fed from the contact point to the internal circuit and raising the level of a signal fed from the internal circuit to the contact point.