US Patent No. 10,422,939

WAVEGUIDE HAVING UNIDRECTIONAL ILLUMINANCE


Patent No. 10,422,939
Issue Date September 24, 2019
Title Waveguide Having Unidrectional Illuminance
Inventorship Eric J. Tarsa, Goleta, CA (US)
David R. Stone, Northridge, CA (US)
Jean-Claude David Ramey de Sugny, Santa Barbara, CA (US)
Assignee IDEAL INDUSTRIES LIGHTING LLC, Durham, NC (US)

Claim of US Patent No. 10,422,939

1. A display lighting element for viewing of an object disposed therein, comprising:a luminaire comprising:
a transparent optical waveguide comprising a primary light-emitting surface and a secondary surface opposite the primary light-emitting surface;
a light source coupled to the transparent optical waveguide; and
a plurality of light extraction features disposed on the primary light-emitting surface; and
wherein the plurality of light extraction features comprises a first portion adjacent to the primary light-emitting surface and a second portion distal from the primary light-emitting surface, wherein the first portion comprises a truncated hemispherical shape in cross section and the second portion comprises one of a truncated conical shape and a cylindrical shape in cross section such that the plurality of light extraction features develop a directional illumination distribution through the primary light-emitting surface in a direction away from the secondary surface onto the object displayed,
a display case comprising a housing wherefrom the display lighting element is suspended;
wherein the object is viewable through the secondary surface and the primary light-emitting surface by a direct line-of-sight.