Patent ID: 8649079

Claim:
A mirror driving device comprising: a mirror part; a pair of inner actuator parts which are arranged on both sides of the mirror part so as to sandwich the mirror part, and is coupled to the mirror part, the pair of inner actuator parts configured to perform bending displacement due to deformation of a piezoelectric body; a pair of outer actuator parts which are arranged on both sides of the mirror part, are arranged at positions farther from the mirror part than the pair of inner actuator parts, and are coupled to the inner actuator parts, the pair of outer actuator parts configured to perform bending displacement due to deformation of a piezoelectric body; fixing and supporting parts which are coupled to end portions of the outer actuator parts other than coupling parts of the outer actuator parts with the inner actuator parts, the fixing and supporting parts configured to support the outer actuator parts by fixing the outer actuator parts at the end portions; an inner actuator driving voltage supply part configured to supply driving voltage to the inner actuator parts to actuate the inner actuator parts; and an outer actuator driving voltage supply part configured to supply driving voltage to the outer actuator parts to actuate the outer actuator parts, wherein one ends of the inner actuator parts are coupled to the mirror part, and the other ends of the inner actuator parts are coupled to the outer actuator parts, a driving voltage with a frequency for inducing oscillation of the mirror part in a rotating direction of the mirror part associated with resonance drive of the corresponding actuator parts is supplied from one driving voltage supply part of the inner actuator driving voltage supply part and the outer actuator driving voltage supply part to the inner actuator parts or the outer actuator parts corresponding to the one driving voltage supply part, and, simultaneously with the resonance drive, a driving voltage for inclining the mirror part without exciting resonance drive is supplied from the other driving voltage supply part to corresponding actuator parts different from the actuator parts performing the resonance drive of the inner actuator parts and the outer actuator parts.