Patent ID: 9594244
Date: 2017-03-14
CPC Classifications: B81B,G02B

Claim:
1. A light deflector, comprising: a fixing portion; and a movable portion including a mirror portion for deflecting light by swinging about a predetermined swing axis, a torsion bar fixedly supported on the fixing portion and having an axis serving as the swing axis, and a supporting body configured to support the mirror portion and fixed to the torsion bar; wherein: the movable portion includes a recess through which the axis passes; and a mass body is arranged in the recess; the mirror portion including a substantially planar deflecting surface for deflecting light and a non-deflecting surface opposite the deflecting surface; and the recess in the movable portion is defined by a through hole portion that passes through the supporting body and one opening of the through hole is closed by the non-deflecting surface of the mirror portion so that the non-deflecting surface of the mirror portion closes the through hole portion and forms a closed bottom of the recess, the mass body is an adhesive and has a cross section having a circular arc shape, the adhesive being applied to the non-deflecting surface of the mirror portion in an amount for adjusting a resonant frequency of the movable portion and being cured on the non-deflecting surface of the mirror portion, the supporting body includes a first supporting member extending in a direction intersecting with the torsion bar, a second supporting member arranged to face the first supporting member and extending in a direction intersecting the torsion bar, a third supporting member connecting the first and second supporting members, a fourth supporting member arranged symmetrically to the third supporting member with respect to the torsion bar and connecting the first and second supporting members, a fifth supporting member including the hole portion, and a space defined by the first, second, third and fourth supporting members and having the fifth supporting member arranged therein; the fifth supporting member connects the third and fourth supporting members; the mirror portion is disposed on and supported by the third, fourth and fifth supporting members; and the torsion bar includes a first torsion bar fixed to the first supporting member in a center of the first supporting member and a second torsion bar fixed to the second supporting member in a center of the second supporting member.