Patent ID: 7800745
Filing Date: 2010-09-21
Classification: G01J

Abstract:
1. A goniophotometer comprising: a main support tower having a main horizontal axis; an upright mirror tower facing the main support tower; a fixed shaft being placed coaxially with the main horizontal axis, a lamp support arm having first and second ends with the first end being connected to the fixed shaft, a test light source being connected to the second end of the lamp support arm by a rotation drive mechanism, the rotation drive mechanism driving the test light source to rotate around a vertical axis that perpendicularly intersects the main horizontal axis; a rotation shaft being rotated around the main horizontal axis in a bearing that is mounted on an outer frame of the fixed shaft; a swing arm being connected to the rotation shaft, the swing arm having first and second ends, a rotation mirror being fixed to the first end of the swing arm, a first detector being fixed to the second end of the swing arm; an upright mirror being rigidly fixed to the upright mirror tower, the upright mirror being perpendicular to the main horizontal axis; the rotation mirror, the upright mirror and the first detector being configured such that a test light beam emitted from the test light source entering into the rotation mirror and then being reflected to the upright mirror, and then being reflected into an optical center of a sensitive surface of the first detector in a normal direction; and both the rotation mirror and the upright mirror being flat, the shape of the rotation mirror being elliptic, round or octagonal, the shape of the upright mirror being round or ellipse or octagonal.