| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an induction type reading device, capable of sure reading, even though the signal level of one sideband from a noncontact information recording medium becomes weak. <P>SOLUTION: The guided sensing device 20 comprises a transmitting section 2101 for transmitting electric power to an RF tag by means of electromagnetic induction; a first resonance section 2103 for outputting an upper sideband and second resonance section 2109 for outputting a lower sideband by resonating with signals of the upper and lower sidebands, transmitted from an antenna section 2001, which gains the signals of the upper and lower sidebands located both sides of a main carrier wave caused by load fluctuations of the RF tag; a first detection section 2104 and second detection section 2110 for detecting respective outputs of the first resonance section 2103 and second resonance section 2109; an addition section 2114 for compositing the detected signals; an AD conversion section 2115 for converting the output of the adding section 2114 into a digital signal, and a control section 2116 for decoding the converted signal. <P>COPYRIGHT: (C)2008,JPO&INPIT |
