US 12,332,427 B2
Light deflector
Tomotaka Asari, Tokyo (JP)
Assigned to Stanley Electric Co., Ltd., Tokyo (JP)
Filed by Stanley Electric Co., Ltd., Tokyo (JP)
Filed on May 13, 2022, as Appl. No. 17/743,457.
Claims priority of application No. 2021-082273 (JP), filed on May 14, 2021.
Prior Publication US 2022/0365338 A1, Nov. 17, 2022
Int. Cl. G02B 26/08 (2006.01); B81B 3/00 (2006.01); G02B 26/12 (2006.01)
CPC G02B 26/0858 (2013.01) [B81B 3/0021 (2013.01); G02B 26/127 (2013.01); B81B 2201/042 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A light deflector comprising:
a mirror section that reflects light;
a frame body provided in such a manner as to surround the mirror section;
a pair of torsion bars having one end of each torsion bar connected to the mirror section and the other end thereof connected to the frame body on an axis passing through a center of the mirror section; and
a piezoelectric actuator that is provided on the frame body and rotates the torsion bars around the axis in a reciprocating manner,
wherein the torsion bar has a constricted shape in which, in a case where a connection between the torsion bar and the mirror section is defined as a first connection and a connection between the torsion bar and the frame body is defined as a second connection, a transverse width at the first connection and the second connection is the largest and the transverse width gradually decreases toward a central part in a length direction, and
wherein the transverse width at the first connection or the second connection of the torsion bar is denoted by W1, a transverse width at the central part of the torsion bar in the length direction is denoted by W2, and (W1−W2)/2=W3, and
wherein a transverse width W4 of the torsion bar at a middle part halfway between the first connection or the second connection and the central part in the length direction is W2+(0.30×W3) or more and W2+(0.35×W3) or less.