摘要 |
PROBLEM TO BE SOLVED: To provide a system capable of discriminating many factors relating to waste in multiple stages by an inexpensive constitution. SOLUTION: A waste collection system is installed in a collection place of waste containers, and provided with an ID reading device transmitting and receiving electromagnetic waves resonating with noncontact discrimination elements through transmitter antennas Y1b, Y1c, Y1d and Y1e, and receiving the electromagnetic waves through receiver antennas. In the waste collection system, resonance circuits 21a, 21b-21e incorporated in the noncontact discrimination elements are individuated by resonance frequencies in a plurality of stages different at each resonance circuit, the resonance frequencies of the electromagnetic waves transmitted from the transmitting antenna and received by the receiver antenna provided with the ID reading device correspond to the resonance frequencies of the resonance circuits individuated in the plurality of stages and set in the plurality of stages. COPYRIGHT: (C)2009,JPO&INPIT
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