Visual tuning electronic drive circuitry for ultrasonic dental tools
    81.
    发明授权
    Visual tuning electronic drive circuitry for ultrasonic dental tools 失效
    视觉调谐电子驱动电路用于超声牙科工具

    公开(公告)号:US3586936A

    公开(公告)日:1971-06-22

    申请号:US3586936D

    申请日:1969-10-16

    Applicant: C & B CORP

    Inventor: MCLEROY ROBERT P

    CPC classification number: B06B1/0223 B06B2201/58 B06B2201/76

    Abstract: Solid state electronic circuitry for driving the magnetostrictive transducer of ultrasonic dental tools is described, wherein tuning to resonance is controlled by circuit adjustment to maximum brightness of a tuning indicator lamp. Variation of brightness of the lamp as a function of tuning accuracy is achieved by feeding a reference voltage proportional to the excitation current flowing through the ultrasonic transducer to the input of a differential amplifier stage to compare it with a preset reference voltage. The varying output voltage thus derived is amplified to provide an energization current for the indicator lamp which will be proportional to the transducer excitation current and thus an indication of tuning to resonance.

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