Patent ID: 8681410

Claim:
An optical scanner comprising: a mirror portion including: a base plate portion; and a reflective portion which is adhered to a first surface which is one of a front surface and a back surface of the base plate portion, and which is configured to reflect an incident light; and a torsion beam portion which is connected to the mirror portion, made of a same material as the base plate portion and integrally formed with the base plate portion, and which is configured to be torsionally vibrated, wherein the reflective portion includes a reinforcement portion and a reflective surface, wherein the reinforcement portion is made of material having a density ρ 2 lower than a density ρ 1 of the base plate portion and a Young's modulus E 2 greater than a Young's modulus E 1 of the base plate portion, wherein the reflective surface is formed on a second surface which is one of a front surface and a back surface of the reinforcement portion, and is configured to reflect the incident light, wherein a third surface which is one of the front surface and the back surface of the reinforcement portion and is opposite to the second surface is adhered to the first surface of the base plate portion, and wherein the reinforcement portion is made of material having a ratio ρ 2 /E 2 of 1.0×10 -8 (s 2 m 2 ) or less.