Patent ID: 7116493
Filing Date: 2006-10-03
Classification: G02B

Abstract:
1. A beam shaping device for converting an elliptical cross section of a beam of laser light emitted from a semiconductor laser light source, wherein light-entrance-side and light-exit-side surfaces of the beam shaping device both have a curvature only in a direction corresponding to the major-axis direction of the cross section of the beam, so that the beam shaping device reduces the diameter of the beam along the major axis thereof, wherein the light-entrance-side surface of the beam shaping device is a convex surface, and the light-exit-side surface of the beam shaping device is a concave surface; wherein, of the light-entrance-side and light-exit-side surfaces, one is a circular-arc cylindrical surface and the other is a non-circular-arc cylindrical surface, and wherein the following conditional formula is fulfilled:  where T T