| 摘要 |
PROBLEM TO BE SOLVED: To prolong a battery service life and to eliminate supply of unrequired power. SOLUTION: A non-contact ID tag is provided with a coil 1 receiving a command transmitted from a reader 20 and returning a response to the reader 20, a control circuit 2 performing control so as to make the coil 1 return the response and a battery 5 supplying power required for the response by the coil 1 to the control circuit 2 and the coil is induced by electromagnetic induction by the reader 20. The non-contact ID tag is provided with a switch circuit 3 performing opening/closing operations when a power supply instruction signal is outputted from the control circuit 2 so as to supply the power from the battery 5 to the control circuit 2 and the control circuit 2 outputs the power supply instruction signal at the time of judging that the power is required. |
