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1. (WO2010116810) WIRELESS TAG COMMUNICATION DEVICE

Pub. No.:    WO/2010/116810    International Application No.:    PCT/JP2010/052949
Publication Date: Fri Oct 15 01:59:59 CEST 2010 International Filing Date: Fri Feb 26 00:59:59 CET 2010
IPC: G06K 17/00
H04B 1/59
Applicants: BROTHER KOGYO KABUSHIKI KAISHA
ブラザー工業株式会社
TSUJIMOTO Yoshiyuki
辻本 嘉之
NAGAI Takuya
永井 拓也
Inventors: TSUJIMOTO Yoshiyuki
辻本 嘉之
NAGAI Takuya
永井 拓也
Title: WIRELESS TAG COMMUNICATION DEVICE
Abstract:
Electricity can be prevented from being wasted while transmission failure and receiving failure. A reader (1) comprises a device antenna (3) which forms a radio communicable communication range (20), and performs radio communication with a wireless tag circuit element (To) located within the communication range (20). The reader transmits a response request signal to the wireless tag circuit element (To) by the device antenna (3); acquires tag identification information from the response signal received from the device antenna (3); stores the acquired tag identification information; calculates a duplicate acquisition ratio from the duplicate acquisition number regarding the current acquisition result of the tag identification information with respect to the past acquisition record of the tag identification information, and the acquisition result; compares the calculated duplicate acquisition ratio with a comparison threshold value; and, on the basis of the comparison result, expands the communicable range of the device antenna (3) when the duplicate acquisition ratio is at least lower than the comparison threshold value, and narrows the communicable range of the device antenna (3) when the duplicate acquisition ratio at least exceeds the comparison threshold value.