Patent ID: 8259209
Filing Date: 2012-09-04
Classification: G03B

Abstract:
1. An optical device comprising: a) an image capturing unit configured to convert an incident light beam to an electric signal; b) an optical element arranged to be axially forward to an optical axis of the image capturing unit; c) an insulation member arranged to face with a light beam incident surface of the optical element and to be movable along the light beam incident surface of the optical element; and d) an electric control unit configured to electrostatically charge the insulation member and to neutralize the insulation member electrostatically charged, wherein the electric control unit electrostatically charges the insulation member before the insulation member is moved along the light beam incident surface of the optical element, wherein the insulation member electrostatically charged by the electric control unit is moved along the light beam incident surface of the optical element, and wherein the electric control unit neutralizes the insulation member after the insulation member is moved along the light beam incident surface of the optical element.