Patent ID: 8422006
Filing Date: 2013-04-16
Classification: G01M

Abstract:
1. A system for testing a lens module, the lens module comprising a barrel and a lens received in the barrel, the barrel comprising a side surface which is parallel to the central axis of the barrel, the lens comprising a smooth and flat non-optical surface, the system comprising: an alignment device comprising a leveling unit and an alignment block supported by the leveling unit, wherein the alignment block comprises an alignment surface configured for being in contact with and parallel to the side surface of the barrel, and the leveling unit is configured for adjusting the alignment surface of the alignment block to be perpendicular to a horizontal plane such that the side surface of the barrel is perpendicular to the horizontal plane; a position detection device configured for determining the three dimensional coordinates of three non-collinear points on the non-optical surface; and a processing device configured for determining whether the non-optical surface is parallel to the horizontal plane according to the coordinates of the three non-collinear points, wherein the processing device comprises a calculating module for calculating an angle θ between the non-optical surface and the horizontal plane according to the following formula: wherein (x