Patent ID: 6421100
Filing Date: 2002-07-16
Classification: H04N

Abstract:
An alignment apparatus for checking the alignment of a lens of a projection tube in a rear projection television receiver, said apparatus comprising:a base having a substantially flat bottom surface, said bottom surface having aligning pins protruding from the bottom surface of the base for frictionally engaging a circumferential surface of a housing in which the lens is mounted such that the bottom surface of the base is pressed against a front surface of the lens; a gimbal system having a bottom section mounted to the base, and a top section, said gimbal system having first adjusting means for adjusting the top section with respect to the base in two orthogonal directions in a plane parallel to a plane of the bottom surface of the base, and second adjusting means for angularly adjusting the plane of the top surface with respect to the plane of the bottom surface of the base; and a laser beam generating device mounted on the top section of said gimbal system, whereby said first and second adjusting means enable a laser beam emitted from the laser beam generating device to be coaxial with a central axis of the lens.