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Title:
RADIO TAG AND ITS PROXIMITY STATUS DETECTION METHOD
Document Type and Number:
Japanese Patent JP2006309592
Kind Code:
A
Abstract:

To detect the proximity status of radio tags with the ID of the radio tag.

This radio tag is provided with a memory for storing an identification code, a transmission/reception part for transmitting/receiving an electric wave and a control part for processing the command of the received signal. The control part receives a control signal including an identification code selected from a reader/writer, and when the selected identification code is not matched with the identification code stored in the memory, an active status for processing all commands included in the received signal is switched to a halt status for processing only a halt release command, and when the selected identification code is matched with the identification code stored in the memory, the active status is maintained, and a response signal including the halt release command is transmitted after the lapse of a fixed delay time, and when the response signal including the halt release command is received from another radio tag in the halt status, the halt status is switched to the active status.


Inventors:
KUKIDA JUZO
Application Number:
JP2005133096A
Publication Date:
November 09, 2006
Filing Date:
April 28, 2005
Export Citation:
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Assignee:
NTT ADVANCED TECH KK
International Classes:
G06K17/00; G06K19/07; H04B5/02
Domestic Patent References:
JPH10283439A1998-10-23
JPH0620110A1994-01-28
JPH0785225A1995-03-31
JPH08316895A1996-11-29
JPH04263385A1992-09-18
JPH1056410A1998-02-24
JPH11344562A1999-12-14
JPS6293779A1987-04-30
JP2005108112A2005-04-21
JP2003223624A2003-08-08
JP2003150916A2003-05-23
JP2002024778A2002-01-25
JP2003296682A2003-10-17
JP2001283171A2001-10-12
JP2004165089A2004-06-10
JP2004152543A2004-05-27
JPH10506357A1998-06-23
JPH10283439A1998-10-23
JPH0620110A1994-01-28
JPH0785225A1995-03-31
JPH08316895A1996-11-29
JPH04263385A1992-09-18
JPH1056410A1998-02-24
JPH11344562A1999-12-14
JPS6293779A1987-04-30
JP2005108112A2005-04-21
JP2003223624A2003-08-08
JP2003150916A2003-05-23
JP2002024778A2002-01-25
JP2003296682A2003-10-17
JP2001283171A2001-10-12
JP2004165089A2004-06-10
JP2004152543A2004-05-27
Attorney, Agent or Firm:
谷 義一
阿部 和夫