Patent ID: 9395536
Filing Date: 2016-07-19
CPC Classification: G02B,Y10T

Claim Text:
1. An optical deflector comprising: a mirror; a frame surrounding said mirror; first and second torsion bars oppositely arranged along a first axis of said frame, each of said first and second torsion bars having an end coupled to a circumference of said mirror; first and second piezoelectric actuators which are opposite to each other with respect to said mirror, and which rock said mirror around said first axis, wherein each of said first and second piezoelectric actuators is coupled to both of said first and second torsion bars; first and second coupling bars each of which is coupled between said frame and one of said first and second piezoelectric actuators, wherein the first and second coupling bars are arranged along a second axis perpendicular to said first axis; another frame surrounding said frame; first and second outer piezoelectric actuators which are coupled between said frame and said other frame, and which rock said mirror around the second axis; and a control unit which controls said first and second piezoelectric actuators, wherein each of said first and second piezoelectric actuators is divided into discrete first, second and third areas between said first torsion bar and said second torsion bar in accordance with boundaries arranged along a first radial direction, a second radial direction, a third radial direction, and a fourth radial direction clockwise from said first axis, wherein said boundaries physically separate said discrete first, second and third areas of each of said first and second piezoelectric actuators, wherein the second area of said first piezoelectric actuator is between said first and second radial directions, wherein the second area of said second piezoelectric actuator is between said third and fourth radial directions, wherein first piezoelectric portions are formed in the first and third areas of said first piezoelectric actuator and in the second area of said second piezoelectric actuator, wherein second piezoelectric portions are formed in the first and third areas of said second piezoelectric actuator and in the second area of said first piezoelectric actuator, and wherein said control unit applies a first drive voltage to said first piezoelectric portions and applies a second drive voltage opposite in phase to said first drive voltage to said second piezoelectric portions.