Patent ID: 7872789
Filing Date: 2011-01-18
Classification: B41J,G02B,H02K

Abstract:
1. An optical device comprising: a mass section in a plate shape including a light reflector with light reflectivity, the mass section including: a pair of first mass sections in a plate form; a second mass section provided between the pair of first mass sections on the basis of a top view; and a pair of coupling members with elastic deformability for coupling the second mass section to the first mass sections in a pivotally movable manner; wherein the second mass section is provided with a light reflector and each of the first mass sections is provided with a magnetic section; a supporting section for supporting the mass section; a pair of elastic sections with elastic deformability for coupling the mass section to the supporting section in a pivotally movable manner; and a driving unit for pivotally moving the mass section, the driving unit including: a magnetic section provided on the mass section, magnetized in a direction perpendicular to a surface of the mass section; a pair of magnetic poles with different polarities, provided in a manner to face each other in a direction perpendicular to a pivotal movement central axis with the magnetic portion intervened on the basis of a top view of the mass section in a non-driven condition, wherein the pair of magnetic poles are formed in a single yoke, with one magnetic pole being on one end of the yoke and the other magnetic pole with the different polarity is disposed on the other end of the yoke, with a magnetic path being formed in the yoke therebetween by a magnetic core disposed between the two ends of the yoke on which a coil is wound; and a magnetic field generator having a coil for generating a magnetic force between the pair of magnetic poles which is disposed in the magnetic path of the yoke by applying a current to the coil wound around the magnetic core, wherein the mass section is pivotally moved upon torsional deformation of the elastic section by operating the driving unit so that a direction of light reflected by the light reflector is changeable, and wherein the magnetic generator is structured in a manner to generate a magnetic field between the pair of magnetic poles by applying a voltage to the coil to pivotally move the mass section with respect to the supporting section.