Patent ID: 6726345
Filing Date: 2004-04-27
Classification: F21V,F21W

Abstract:
An open type luminaire lens comprising:a non-circular reflective lens having a metalized exterior surface and a prism section, said non-circular reflective lens having a shape generally defined by the combination of two parabolas, said prism section an array of external reflecting prisms of varying predetermined shapes and varying predetermined sizes, said predetermined shapes and predetermined sizes defined by the relationship of angles A, B and P where angle A is defined by a counter clockwise angle from the leading point of a first prism to the convergence point of said first prism and a next adjoining prism, angle B is defined by a clockwise angle from the leading point of said first prism to the convergence point of said first prism and said next adjoining prism and angle P is starts along minor axis (y=0) and has a value of 90 degrees along the major axis x=0 with angle A, angle B and angle P having the following relationship: Angle A=P+8; for values 0&lE;P&lE;9; and Angle A=21.305Ln(P)âˆ’41.714; for values of 10&lE;P&lE;44 degrees; and Angle A=(âˆ’0.0078)P2+0.9513Pâˆ’4.6875; for values 46&lE;P&lE;90 degrees Angle B=0.0049P2âˆ’0.7615P+91.437; for 0&lE;P&lE;44 degrees; and Angle B=0.0075P2âˆ’0.9243P+93.869; for values 46&lE;P&lE;88 degrees; Angle B=Pâˆ’20; for values 89 &lE;P&lE;90 degrees.