Patent ID: 7529011

Claim:
A deflector mirror, comprising: a mirror substrate configured to vibrate in a reciprocating manner on beams as a torsional rotary shaft so as to deflect a light beam emitted from a light source, wherein the mirror substrate includes a plurality of regions in each of portions thereof extending from the torsional rotary shaft to respective ends of the mirror substrate, the regions being different in flexural rigidity, wherein the flexural rigidity is maximized in a first one of the regions between the torsional rotary shaft and the end of the mirror substrate in each of said portions thereof the first one of the regions including a position substantially L/3 apart from the torsional rotary shaft, L being a dimension of the mirror substrate in a direction perpendicular to the torsional rotary shaft, and wherein in the first one of the regions, bending moment acting on the mirror substrate when the mirror substrate vibrates is maximized, and the flexural rigidity of a second one of the regions disposed between the torsional rotary shaft and the first one of the regions is lower than the flexural rigidity of the first one of the regions.