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:
Jan. 19, 2010
Filed:
Sep. 01, 2005
Hideyuki Ohara, Kyoto, JP;
Takehiro Kawai, Kyoto, JP;
Keisuke Saito, Osaka, JP;
Kosuke Hayama, Kyoto, JP;
Hideyuki Ohara, Kyoto, JP;
Takehiro Kawai, Kyoto, JP;
Keisuke Saito, Osaka, JP;
Kosuke Hayama, Kyoto, JP;
Omron Corporation, Kyoto, JP;
Abstract
A transmission controllerB is configured to transmit an R/W request signal for requesting transmission of a tag response signal to a RFID tagtwice. At this time, a frequency controllerA controls a PLL sectionA to transmit the R/W request signal via different carrier frequencies. A phase information acquirerA detects a phase change amount of the tag response signal that is transmitted via different carrier frequencies. A distance calculatorB calculates the distance between the reader/writerand the RFID tagon the basis of the phase change amount.