Patent ID: 8172431
Filing Date: 2012-05-08
Classification: F21V,G02B

Abstract:
1. A reflector comprising a light reflective wall and a light output lying in a light output plane, the light reflective wall being defined as a portion of the internal surface of at least one ellipsoid, the focal axis of which has a non-zero angle α with respect to an axis (V) perpendicular to the light output plane, wherein the light reflective wall is defined as a portion of the internal surface of a lower ellipsoid (S′) integral with a portion of the internal surface of an upper ellipsoid (S), said upper and lower ellipsoids having a common focal axis and a common first focus, the second focus of the lower ellipsoid (S′) being positioned on the common focal axis beyond the second focus of the upper ellipsoid (S) with respect to the common first focus, the surface portion of the lower ellipsoid (S′) being taken between (i) the most remote point of said lower ellipsoid from the light output plane, and (ii) the focal plane (P) which has the same angle α with respect to the axis (V) perpendicular to the light output plane than said common focal axis and which contains said common focal axis and (iii) said light output plane, the surface portion of the upper ellipsoid (S) being taken between said focal plane (P) and the light output plane.