| 摘要 |
A resonance circuit ( 17 ) is composed of a capacitor Cs of a ferroelectric layer ( 2 ) of a recording medium ( 1 ), and a resonator ( 14 ). A change of the capacitor Cs of the ferroelectric layer ( 2 ) is converted into a frequency of an oscillation signal by the resonance circuit. As the resonator ( 14 ), a resonance element having a high Q, such as an SAW resonator, is used.
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