Patent ID: 7941051

Claim:
A laser optical device, comprising: a laser light emitting section to emit laser signal light modulated by information; a laser light receiving section to receive the laser signal light emitted from the laser light emitting section; a light condensing optical unit to conduct the laser signal light emitted from the laser light emitting section to the laser light receiving section; an actuator to move the light condensing optical unit; a light intensity detecting section to detect an intensity of the laser signal light conducted to the laser light receiving section; and a control section to control drive of the actuator so as to align the laser signal light conducted by the light condensing optical unit to the laser light receiving section; wherein in a cycle the actuator, having an electromechanical transducer and a vibration member to generate wobbling by excitation of the electromechanical transducer in contact with the light condensing optical unit so that the light condensing optical unit is moved by a friction force created between the vibration member and the light condensing optical unit, implements a first wobbling operation where the control section moves the light condensing optical unit with a predetermined frequency in a cycle in a first moving direction and a second wobbling operation where the light condensing optical unit is moved in a second moving direction which is perpendicular to the first moving direction with a predetermined frequency, and wherein f 1 representing a frequency of the first wobbling and f 2 representing a frequency of the second wobbling operation satisfy a relation described by a formula 1 or formula 2 below, and the control section controls the actuator to implement the first wobbling and second wobbling simultaneously; f 1=2 ×n×f 2 Formula 1 f 2=2 ×n×f 1; Formula 2 where n is a positive integer.