US Patent No. 10,378,726

LIGHTING SYSTEM GENERATING A PARTIALLY COLLIMATED DISTRIBUTION COMPRISING A BOWL REFLECTOR, A FUNNEL REFLECTOR WITH TWO PARABOLIC CURVES AND AN OPTICALLY TRANSPARENT BODY DISPOSED BETWEEN THE FUNNEL REFLECTOR AND BOWL REFLECTOR


Patent No. 10,378,726
Issue Date August 13, 2019
Title Lighting System Generating A Partially Collimated Distribution Comprising A Bowl Reflector, A Funnel Reflector With Two Parabolic Curves And An Optically Transparent Body Disposed Between The Funnel Reflector And Bowl Reflector
Inventorship Xin Zhang, Los Angeles, CA (US)
Paul Pickard, Acton, CA (US)
Raghuram L. V. Petluri, Cerritos, CA (US)
Assignee ECOSENSE LIGHTING INC., Los Angeles, CA (US)

Claim of US Patent No. 10,378,726

1. A lighting system, comprising:a bowl reflector having a rim defining a horizon and defining an emission aperture, the bowl reflector having a first visible-light-reflective surface defining a portion of a cavity, a portion of the first visible-light-reflective surface being a first light-reflective parabolic surface;
a funnel reflector having a flared funnel-shaped body, the funnel-shaped body having a central axis and having a second visible-light-reflective surface being aligned along the central axis, the funnel-shaped body also having a tip being located within the cavity along the central axis, a portion of the second visible-light-reflective surface being a second light-reflective parabolic surface and having a cross-sectional profile defined in directions along the central axis that includes two parabolic curves that converge towards the tip of the funnel-shaped body;
a visible-light source including a semiconductor light-emitting device, the visible-light source being configured for generating visible-light emissions from the semiconductor light-emitting device;
an optically-transparent body being aligned with the second visible-light-reflective surface along the central axis, the optically-transparent body having a first base being spaced apart along the central axis from a second base and having a side surface extending between the bases, and the first base facing toward the visible-light source;
wherein the second light-reflective parabolic surface has a ring of focal points being located at a first position within the cavity, each one of the focal points being equidistant from the second light-reflective parabolic surface, and the ring encircling a first point on the central axis;
wherein the second light-reflective parabolic surface has an array of axes of symmetry intersecting with and radiating in directions all around the central axis from a second point on the central axis, each one of the axes of symmetry intersecting with a corresponding one of the focal points, the second point on the central axis being located between the first point and the horizon of the bowl reflector; and
wherein the visible-light source is within the cavity at a second position being located, relative to the first position of the ring, for causing some of the visible-light emissions to be reflected by the second light-reflective parabolic surface as having a partially-collimated distribution.