Patent ID: 9097897
Filing Date: 2015-08-04
Classification: G02B,H01L

Abstract:
1. An optical deflector comprising: a mirror; a first support frame surrounding said mirror; a first torsion bar arranged along a first axis of said mirror, a first end of said first torsion bar being coupled to an outer circumference of said mirror; a pair of first piezoelectric actuators arranged between said first support frame and said first torsion bar; and a first piezoelectric sensor inserted between said first torsion bar and one of said first piezoelectric actuators, wherein said first piezoelectric sensor includes at least one first piezoelectric sensor element having a width smaller than two-fifths of a width of the one of said first piezoelectric actuators and being arranged at a wide portion within two-fifths of said width from an inner end of the one of said first piezoelectric actuators, and wherein said first piezoelectric sensor element is directly adjacent to said first torsion bar.