| 摘要 |
PURPOSE: A resonant frequency control oscillation device is provided, which controls a resonant frequency by measuring a varying resonant point, and saves a power by driving an oscillator with a minimum current. CONSTITUTION: A frequency generator(600) generates a frequency signal under the control of a control part. An oscillator(100) is driven by a current, and outputs an analog voltage signal according to a voltage value induced in a voice coil(101) by the current. A driver unit(700) drives the oscillator by applying a current to the oscillator according to the frequency signal inputted from the frequency generation unit. An analog digital converter(400) converts an analog voltage signal from the oscillator into a digital voltage signal. And a control part(500) controls the frequency generation part, and sets a frequency corresponding to the largest digital voltage signal among a number of digital voltage signals as a resonant frequency to drive the oscillator.
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