Patent ID: 7232241
Filing Date: 2007-06-19
Classification: G03B,H01J,H04N

Abstract:
1. An illumination system comprising: an arc tube including a light-emitting portion that emits light between electrodes and sealing portions that is arranged on both sides of the light-emitting portion; a first reflecting mirror that is arranged on a rear side of the light-emitting portion along a longitudinal direction of the arc tube; and a second reflecting mirror that is arranged on a front side of the light-emitting portion, a diameter D a reflecting surface of the second reflecting mirror surrounding about half of the front side of the light-emitting portion and the light emitted from a center of the light-emitting portion and incident on the second reflecting mirror and a normal of the second reflecting mirror agree with each other; and the reflecting surface of the second reflecting mirror being formed by face-grinding or press-molding a pipe having an inside diameter larger than the outside diameter of the sealing portion.