发明名称 |
Detecting device having spaced transmitting and receiving coils for detecting a metal strip embedded in paper money |
摘要 |
The metal detecting device includes first and second coils provided on both sides of a passageway for paper money. This metal detecting device is designed for use in detecting a metal strip embedded in the paper money in order to determine whether the paper money is genuine or counterfeit. The first coil is connected to a high frequency AC source to generate an AC magnetic field. The second coil is connected to a capacitor to form a resonance circuit which resonates at the same frequency as the AC current. The variation of the Q factor of the resonance circuit due to eddy-current losses produced in the metal strip of the paper money is used by a detecting circuit to determine whether the paper money passing through the space between the first and second coils is genuine.
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申请公布号 |
US4536709(A) |
申请公布日期 |
1985.08.20 |
申请号 |
US19840645533 |
申请日期 |
1984.08.29 |
申请人 |
TOKYO SHIBAURA DENKI KABUSHIKI KAISHA |
发明人 |
ISHIDA, TSUYOSHI |
分类号 |
G07D7/04;H03K17/95;(IPC1-7):G01N27/72;G01R33/12;G06K7/08 |
主分类号 |
G07D7/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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