Patent ID: 7916372

Claim:
A movable body apparatus comprising: a vibratory system having a resonance frequency and a movable body capable of being reciprocally and rotatably vibrated; a vibration detecting portion configured to detect a vibration condition of the movable body; a driving portion configured to drive the vibratory system with a drive signal; and a controlling portion configured to regulate the drive signal supplied to the driving portion, wherein the controlling portion stores, as a target delay phase difference, a delay phase difference between a drive phase of the drive signal and a vibration phase of the vibratory system obtained from a detection result of the vibration detecting portion, both the drive phase and the vibration phase being obtained at the time when the vibratory system is vibrated at a predetermined frequency, and wherein the controlling portion regulates a driving frequency of the drive signal so that the delay phase difference between the drive phase of the drive signal and the vibration phase of the vibratory system obtained from detection result of the vibration detecting portion, both measured during driving of the vibratory system, is caused to be approximately coincident with the target delay phase difference.