Patent ID: 7692506

Claim:
An oscillation driver device that is connected to a vibrator to form an oscillation loop and causes the vibrator to produce driving vibrations, the oscillation driver device comprising: a gain control amplifier that causes the vibrator to produce the driving vibrations by controlling an oscillation amplitude in the oscillation loop; an automatic gain control circuit that controls the gain of the gain control amplifier based on a signal obtained from the oscillation loop; and a mode setting circuit that switches a mode between a normal operation mode and a low power consumption mode, when the mode setting circuit has switched the mode from the normal operation mode to the low power consumption mode, the automatic gain control circuit being disabled, and a gain in the oscillation loop that drives the vibrator changing from a state in which the gain in the oscillation loop is controlled to be unity by the automatic gain control circuit to a state in which the gain in the oscillation loop is set to be larger than unity; and when the mode setting circuit has switched the mode from the low power consumption mode to the normal operation mode, the automatic gain control circuit resuming operation, and the gain in the oscillation loop changing from the state in which the gain in the oscillation loop is set to be larger than unity to the state in which the gain in the oscillation loop is controlled to be unity by the automatic gain control circuit.