Oscillation device, scanning-type scanner device, information terminal, phase-shift amount adjustment device, and phase-shift amount adjustment method

摘要

An oscillation device includes an oscillator, an oscillation detection unit that detects oscillation of the oscillator and outputs an oscillation detection signal, and a drive unit that generates a drive signal in keeping with the oscillation detection signal and outputs the drive signal to the oscillator. The drive unit includes a phase shift unit that shifts the phase to provide the drive signal as positive feedback to the oscillator. The phase shift unit includes a disturbance generating unit that outputs the periodic signal, a fluctuation unit that causes the amount of phase shift to fluctuate based on the periodic signal, a drive amplitude detection unit that detects the amplitude of the drive signal and outputs a drive amplitude signal, a product detection unit that outputs a detection signal after performing product detection on the drive amplitude signal based on the periodic signal, and an adjustment unit that adjusts the phase-shift amount based on the detection signal.

主权项

1. An oscillation device comprising:
an oscillator; an oscillation detector that detects oscillation of the oscillator and outputs an oscillation detection signal; and a driver that generates a drive signal in accordance with the oscillation detection signal and outputs the drive signal to the oscillator; wherein the driver includes a phase shift controller that shifts a phase to provide the drive signal as positive feedback to the oscillator; and the phase shift controller includes:
a disturbance generator that outputs a periodic signal;a fluctuator that fluctuates an amount of phase shift based on the periodic signal;a drive amplitude detector that detects an amplitude of the drive signal and outputs a drive amplitude signal;a product detector that outputs a detection signal after performing product detection on the drive amplitude signal based on the periodic signal; andan adjuster that adjusts the phase-shift amount based on the detection signal.