Patent ID: 6536923
Filing Date: 2003-03-25
Classification: F21S,F21V

Abstract:
An optical attachment for a light source, the light source having a focal point, the optical attachment having a center and an optical axis, the optical axis passing though the focal point and the center, the optical attachment comprising:an azimuthally asymmetric inner lens for inner light beams emitted by the light source, said inner lens containing the center and surrounding the optical axis; and an azimuthally asymmetric outer reflector for outer light beams from the light source, said outer reflector surrounding said inner lens in a ring-like manner, wherein said inner lens and said outer reflector are formed by mutually adjacent individual angular sectors distributed azimuthally about said optical axis with each angular sector having a substantially constant axial cross-section in a plane passing though said angular sector and containing the optical axis, wherein axial cross-sections of separate angular sectors differ by a scaling with respect to the focal point of the optical attachment in dependence on a radial extension of a respective angular sector.