Patent ID: 8602591

Claim:
A light redirection device ( 1 ) having a central axis (CA), a front-back plane (FB) through the central axis (CA) that separates a front volume (FV) from a back volume (BV), and a left-right plane (LR) through the central axis (CA) and perpendicular to the front-back plane (FB), comprising: at least one light emitting diode ( 2 ) for producing diverging light ( 7 ) centered about the central axis (CA); a hemisphere ( 3 ) for receiving the diverging light ( 7 ) and producing incident light ( 8 ); and a lens ( 10 ) adjacent to and spaced apart by air from the hemisphere ( 3 ) for receiving the incident light ( 8 ) and producing output light ( 9 ) skewed toward the front volume (FV); the lens ( 10 ) having a recessed inner face ( 11 ) facing the hemisphere ( 3 ) that is generally symmetric with respect to the left-right plane (LR) and is asymmetric with respect to the front-back plane (FB), the inner face ( 11 ) having a concave central region (CR), a convex peripheral region (PR) and an inflection zone (IZ) between a central region (CR) and the peripheral region (PR), the lens ( 10 ) having an outer face ( 12 ) facing away from the hemisphere ( 3 ) that is generally symmetric with respect to the left-right plane (LR) and is asymmetric with respect to the front-back plane (FB), the outer face ( 12 ) being convex or flat along the outer face ( 12 ) and having a maximum protrusion at a location (L) laterally displaced from the central axis (CA) along the left-right plane (LR) in the front volume (FV).