Wide-angle non-imaging illumination lens arrayable for close planar targets

摘要

A circular LED illumination lens for short throw lighting, for example, as part of a set of such devices installed on mullions in reach-in refrigerator cabinets, to uniformly light access across the rectangular door and shelves. The lens has an upper surface with a cavity for the LED, an upper surface the shape of a toroid, generated by an elliptical arc, that serves to magnify the light rays from the LED in an outboard direction, and the minor axis tilted about 17 degrees relatives the center axis of the LED which serves to direct the rays at the center of the shelves. The upper surface also preferably includes a spherical dimple to direct light away from the center axis.

主权项

1. A light emitting device attachable to a substrate for wide-angle lighting of a close planar target comprising:
a light emitting element having central rays emitting along a center axis; and an illumination lens having a lower surface with a central cavity about the center axis, the central cavity sized for substantially enclosing the light emitting element; the lower surface joined to an upper surface generally toroidal in profile defining an elliptical arc extending from a major radius along a major axis to a smaller minor radius along a minor axis as the upper surface extends towards the center axis; the minor axis being tilted about 17 degrees relative the center axis; whereby light from the light emitting element is magnified away from the center axis and directed toward the center of the close planar target.