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:
Mar. 31, 2015
Filed:
Jan. 26, 2012
Hirokazu Kasai, Kyoto, JP;
Hidekatsu Nogami, Kusatsu, JP;
Kazushi Yamasaki, Kusatsu, JP;
Shuichi Matsui, Kusatsu, JP;
Hirokazu Kasai, Kyoto, JP;
Hidekatsu Nogami, Kusatsu, JP;
Kazushi Yamasaki, Kusatsu, JP;
Shuichi Matsui, Kusatsu, JP;
Omron Corporation, Kyoto, JP;
Abstract
An antenna is disposed near a route of mobile object. A fixed tag is disposed at a location where a radio wave can be received from the antenna. When receiving a read command from the antenna, a mobile tag attached to the mobile object and the fixed tag send back a response signal at prescribed timing. A signal received from the fixed tag by the antenna is substantially constant. The signal from the fixed tag cannot be read while buried in a signal transmitted from the mobile tag to the antenna while the mobile tag is positioned at a location where communication with the antenna is expected. Conversely, when the mobile tag is at least a prescribed distance away from the antenna, the signal from the mobile tag cannot be read while buried in the signal from the fixed tag.