| 摘要 |
An improved resonator assembly employed in a capacitive pick-up assembly for use in a video disc system includes an oscillator and a resonator. The improved resonator comprises an electrode provided on a stylus for reading information carried on a disc as a track of the disc relatively moves past the stylus, a tuned line having a first end accommodated in a resonator cavity and a second end connected to the stylus electrode, a capacitive element connected between the first end of the tuned line and an inner face of the resonator cavity, and a bypass circuit connected between the tuned line and inner face of the resonator cavity. The bypass circuit has a high impedance with respect to a high frequency signal produced from the oscillator, whereby the bypass circuit cuts current flow of high a.c. component, but allows current flow of d.c. component.
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