Patent ID: 8922724

Claim:
Active shutter glasses for three-dimensional image recognition, the active shutter glasses comprising: a right temple; a left temple; a right-eye lens; and a left-eye lens, wherein the right-eye lens and the left-eye lens comprise liquid crystal cells, the right-eye lens and the left-eye lens have an inclination with respect to a state where the right-eye lens and the left-eye lens are arranged on the same plane, and are arranged on a surface orthogonal to a horizontal surface including the top surfaces of the right temple and the left temple, the direction of inclination of the right-eye lens is the direction in which the outer edge of the right-eye lens approaches an observer side at an azimuth angle.phi..sub.2 in a range of .+−.45.degree. with respect to an azimuth angle.phi..sub.1, at which a contrast ratio has a maximum value, at a polar angle.theta..sub.1 having an angle difference in a range of 2 to 17.degree. from a line normal to the surface of the right-eye lens when not inclined, the direction of inclination of the left-eye lens is the direction in which the outer edge of the left-eye lens approaches the observer side at an azimuth angle.phi..sub.4 in a range of .+−.45.degree. with respect to an azimuth angle.phi..sub.3, at which a contrast ratio has a maximum value, at a polar angle.theta..sub.2 having an angle difference in a range of 2 to 17.degree. from a line normal to the surface of the left-eye lens when not inclined, and the right-eye lens and the left-eye lens are inclined from a vertical plane.