Title:
COMMUNICATION SYSTEM FOR NONCONTACT DATA READER
Document Type and Number:
Japanese Patent JP3191673
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To read data from each responder in the case where a plurality of responders are in existence in the noncontact data reader reading data without any contact from the responders.
SOLUTION: A responder 120 uses a reflection modulation means 121 to send a response signal synchronously with a response synchronizing signal with a prescribed or pseudo random time interval different from that of other responders generated by a response synchronizing signal generating means 123, and an interrogator 100 receives the response signal from the responder 120 and then modulates response data, then even when a plurality of responders are in existence in a communication area of the interrogator, data from each responder are read.
Inventors:
Naoki Adachi
Mitsuo Makimoto
Makoto Hasegawa
Takashi Fukagawa
Mitsuo Makimoto
Makoto Hasegawa
Takashi Fukagawa
Application Number:
JP11249696A
Publication Date:
July 23, 2001
Filing Date:
May 07, 1996
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G01S13/75; G01S13/76; G01S13/79; H04B1/59; H04B7/24; H04B7/26; (IPC1-7): H04B1/59; G01S13/75; G01S13/76; G01S13/79; H04B7/24
Domestic Patent References:
| JP5673944A | ||||
| JP7303111A |
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)
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