Patent ID: 8434914

Claim:
A lens to redirect light from at least one light source, the light having an angular distribution centered around a left-right symmetry plane, the lens comprising: an incident face facing the at least one light source, the incident face including at least one incident corner at which the local surface slope changes abruptly, the at least one incident corner dividing the incident face into an incident inner zone and an incident outer zone, the at least one incident corner being concave and forming an obtuse angle in air; and an exiting face opposite the incident face and including at least one exiting corner at which the local surface slope changes abruptly, the at least one exiting corner dividing the exiting face into an exiting inner zone and an exiting outer zone, wherein the exiting outer zone is defined by a partial curved surface extending from the at least one exiting corner, the partial curved surface including a generally flat portion adjacent the at least one exiting corner and a convex portion extending from the generally flat portion, wherein the generally flat portion is located beneath an intersection point of the exiting inner zone and extends past the intersection point; wherein for each ray of the light from the at least one light source that strikes the incident inner zone and transmits through the lens, the ray strikes the exiting inner zone; wherein for each ray of the light from the at least one light source that strikes the incident outer zone and transmits through the lens, the ray strikes the exiting outer zone; and wherein for each ray of the light from the at least one light source that strikes the incident face, transmits through the lens, strikes the exiting face, and refracts out of the lens, the ray has initial and final propagation angles formed with respect to the left-right symmetry plane, and the final propagation angle is greater than the initial propagation angle.