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, 2011
Filed:
Sep. 28, 2006
Koji Teraoka, Osaka, JP;
Atsuo Inoue, Kyoto, JP;
Koji Teraoka, Osaka, JP;
Atsuo Inoue, Kyoto, JP;
Panasonic Corporation, Osaka, JP;
Abstract
When performing radio communication with a reader/writer (), supply of a power source Sfrom a battery () is started when a level judgment circuit () judges that the signal level of a reception signal Sreceived by an antenna () of a noncontact data carrier () is equal to or higher than a predetermined amplitude and a timer circuit () judges that the state where the amplitude is equal to or higher than the predetermined value has continued for a predetermined period Tor more, and further, the supply of the power source Sfrom the battery is stopped when the level judgment circuit () judges that the signal level of the reception signal Sis lower than the predetermined amplitude and the timer circuit () judges that state where the amplitude is lower than the predetermined value has continued for a predetermined period Tor more, thereby ensuring communication reliability that causes no problem in practical use of the noncontact data carrier (), and avoiding insignificant dissipation of the battery.