Patent ID: 7907317

Claim:
An optical device comprising: a movable plate disposed in a distribution range of light input from outside, and having a light reflecting surface adapted to reflect the light; a shaft member adapted to support the movable plate so that the movable plate can swing around a predetermined axis; a ferromagnetic member provided to the movable plate, the ferromagnetic member being a permanent magnet; and a drive section configured to generate electromagnetic force between the drive section and the ferromagnetic member to thereby swing the movable plate, the drive section including: a coil disposed at a position opposed to the permanent magnet with a predetermined distance from the permanent magnet, and an alternating current signal generator adapted to supply the coil with an alternating current signal, wherein a portion of the drive section, included in the distribution range of the light, is formed of a surface having a normal vector with which the light is reflected to outside of a predetermined range; and the surface having the normal vector includes a plane having a predetermined angle with the movable plate, the plane having the predetermined angle being tilted in a direction perpendicular to a direction of a magnetic field of the permanent magnet.