Patent ID: 7942559
Filing Date: 2011-05-17
Classification: F21K,F21S,F21V,F21W,F21Y,G02B,H01L

Abstract:
1. An improvement in a lens for use in an apparatus for providing a predetermined illuminated surface pattern on an illuminated surface from a predetermined energy distribution pattern of a light source, the light source having a near field and at least a portion of light from the light source being transmitted into a peripheral forward solid angle, the improvement comprising an undercut surface defined on the lens, the lens having a base adjacent to the light source, having a lens axis and having a surface between the base and lens axis including the undercut surface' and a blob zone, the undercut surface extending from the base of the lens at least partially along the surface of the lens toward the lens axis, the undercut surface positioned to intercept light in the near field of the light source in the peripheral forward solid angle of light from the light source, and the undercut surface being characterized by a smaller outer diameter defined from the lens axis at the base of the lens than the outer diameter of the lens in the blob zone, so that the undercut surface of the lens falls away or narrows at some point as the base of the lens is approached.