| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric power suppressing method for a non-contact device which enables eliminating any dead zone near a reader writer existing between the reader writer and the non-contact device, and to provide a non-contact device. <P>SOLUTION: The non-contact device comprises an IC chip 1, an antenna coil 2 which induces induced power on the basis of the AC magnetic field emitted from the reader writer β to supply the induced current to the IC chip 1, and a power suppressing means 3 for suppressing the induced power induced by the antenna coil 2 to a specified power. The power suppressing means 3 comprises a voltage sensor 31 which detects the magnetic field intensity of the AC magnetic field emitted by the reader writer β and generates a sensing signal A corresponding to the magnetic field intensity, a frequency controlling part 32 which generates a control signal B corresponding to the power value of the induced power for each magnetic field intensity previously set, based on the sensor signal A, and a frequency variable tuning part 33 which suppresses the induced power induced by the antenna coil 2 to the specified power on the basis of the control signal B. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
