Patent ID: 8189431

Claim:
A piezoelectric drive device comprising: a piezoelectric actuator including a vibrator having piezoelectric element, and a rotor that is rotated in one specific direction by the vibrator; and a rotation transfer device that transmits rotational energy from the rotor to a driven rotating body, includes an elastic device that stores rotational energy transmitted from the rotor as elastic energy, and a rotation limiting device that has a drive wheel and a driven wheel that rotates in conjunction with rotation of the drive wheel, allows the driven wheel to rotate a specific angle in conjunction with rotation of the drive wheel, and restricts driving the drive wheel from the driven wheel when the driven wheel rotates the specific angle, the elastic device and the rotation limiting device being disposed so that rotational energy transmitted from the rotor is transmitted through the elastic device to the rotation limiting device, the rotor, the elastic device, and the rotation limiting device rendering a serial path for transmitting rotational energy from the rotor to the rotation limiting device.