Abstract:
An optical scanning device includes a mirror portion, a torsion bar extending along a resonance axis, an annular-shaped body coupled to the torsion bar from both sides of the resonance axis to rotate the mirror portion, and an intersection portion piezoelectric element and/or coupling portion piezoelectric elements formed in a rigidity adjustment region including an intersection portion of the torsion bar and the annular-shaped body to change a rigidity of the rigidity adjustment region when a voltage is applied.