| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tag device which when a user bearing the tag device merely passes through the vicinity of the transmission source of a question signal such as a tag reader without intending to enter the inside, effectively suppresses unexpected unlocking of the door without special operation by the user. <P>SOLUTION: The tag device is provided with: an attenuator 201 which attenuates the level of a received question signal; a demodulator 202 which demodulates the attenuated question signal; and a control part 209 which determines whether the demodulation by the demodulator 202 has been performed normally, and performs control to transmit an answer signal including identification information of the tag device when the demodulation is normally performed and to avoid transmitting the answer signal when the demodulation has been performed abnormally. <P>COPYRIGHT: (C)2012,JPO&INPIT |
