LED light assembly having three-part optical elements

Patent metadata

Field	Value
Publication number	US-9659511-B2
Application number	US-201615216562-A
Country	US
Kind code	B2
Filing date	Jul 21, 2016
Priority date	Jul 30, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

An LED lighting assembly includes a circuit board, a number of light emitting diodes (LEDs) overlying the circuit board, and optical element is proximate each LED and separate from other optical elements. Each optical element includes a first portion and a second portion that intersects with the first portion in a region between the first and second portions. The first and second portions are shaped so that at least one surface normal of the first portion intersects with at least one surface normal of the second portion, and the first and second portions are configured so that light from the associated LED exits the associated optical element through the first and the second portions. Each optical element also includes a third portion extending beyond the region between the first portion and the second portion in a direction away from the associated LED.

First claim

What is claimed is:

1. An apparatus comprising a lighting assembly for illumination of an area, the lighting assembly comprising:
a circuit board;
a plurality of light emitting diodes (LEDs) overlying the circuit board; and
a plurality of optical elements, wherein each optical element of the plurality of optical elements is proximate an associated LED of the plurality of LEDs, wherein each optical element of the plurality of optical elements is separate from other optical elements of the plurality of optical elements, and wherein each optical element of the plurality of optical elements comprises a single optical element that includes a first portion, a second portion and a third portion
wherein the first portion of the optical element comprises a first curved surface;
wherein the second portion of the optical element comprising a second curved surface that intersects with the first portion of the optical element in a region between the first portion of the optical element and the second portion of the optical element, wherein the first portion of the optical element and the second portion of the optical element are shaped so that at least one surface normal of the first portion of the optical element intersects with at least one surface normal of the second portion of the optical element and wherein the first and second portions of the optical element are configured so that light from the associated LED exits the associated optical element through the first and the second portions of the optical element;
wherein the third portion of the optical element extends beyond the region between the first portion of the optical element and the second portion of the optical element in a direction away from the associated LED;
wherein the LEDs and optical elements are arranged over the circuit board so that, during operation, light from light assembly does not create hot spots or result in dead spots on the area so long as some of the LEDs are functional.

2. The apparatus of claim 1 , further comprising a heat sink comprising a plurality of fins thermally coupled to the plurality of LEDs.

3. The apparatus of claim 1 , further comprising a billboard comprising the area, wherein the lighting assembly is located adjacent the billboard to illuminate the area.

4. The apparatus of claim 1 , further comprising a billboard comprising the area, wherein the lighting assembly is located adjacent the billboard to illuminate the area when a subset of the LEDs is not generating any light.

5. The apparatus of claim 1 , wherein the LEDs are arranged in two rows that extend along a longitudinal axis of the circuit board.

6. The apparatus of claim 5 , further comprising a heat sink thermally coupled to a lower surface of the circuit board so that the circuit board is between the LEDs and the heat sink, wherein the heat sink comprises a first section substantially parallel to the lower surface of the circuit board and a plurality of fins extending away from the first section and substantially perpendicular thereto, a longitudinal axis of each fin being substantially perpendicular to the longitudinal axis of the circuit board.

7. The apparatus of claim 6 , wherein the LEDs are arranged in only the two rows.

8. A lighting assembly for illumination of an area, the lighting assembly comprising:
a circuit board;
a plurality of light emitting diodes (LEDs) overlying the circuit board; and
a plurality of optical elements, wherein each optical element of the plurality of optical elements is proximate an associated LED of the plurality of LEDs, wherein each optical element of the plurality of optical elements is separate from other optical elements of the plurality of optical elements, and wherein each optical element of the plurality of optical elements comprises a single lens that includes a first portion, a second portion and a third portion
wherein the first portion of the lens comprises a first curved surface;
wherein the second portion of the lens comprising a second curved surface that intersects with the first portion of the lens in a region between the first portion of the lens and the second portion of the lens, wherein the first portion of the lens and the second portion of the lens are shaped so that at least one surface normal of the first portion of the lens intersects with at least one surface normal of the second portion of the lens, and wherein the first and second portions of the lens are configured so that light from the associated LED exits the associated optical element through the first and the second portions of the lens;
wherein the third portion of the lens extends beyond the region between the first portion of the lens and the second portion of the lens in a direction away from the associated LED; and
wherein each optical element of the plurality of optical elements is associated with only one LED of the plurality of LEDs and is configured to direct light from that one LED toward the area such that the light from each optical element of the plurality of optical elements is directed across all of the area, wherein the light from each optical element of the plurality of optical elements is directed across all of the area so that the area is illuminated without hot spots or dead spots.

9. An apparatus comprising a lighting assembly for illumination of an area, the lighting assembly comprising:
a circuit board;
a plurality of light emitting diodes (LEDs) overlying the circuit board; and
a plurality of optical elements, wherein each optical element of the plurality of optical elements is proximate a respective LED of the plurality of LEDs, wherein each optical element of the plurality of optical elements is separate from other optical elements of the plurality of optical elements, wherein each optical element of the plurality of optical elements comprises a lens that includes:
a first outer boundary, a second outer boundary opposite the first outer boundary, a third outer boundary connecting the first outer boundary and the second outer boundary, a fourth outer boundary opposite the third outer boundary, and a central region halfway between the first outer boundary and the second outer boundary;
a first lens portion with an outer surface extending from the first outer boundary toward the central region and having a first peak located between the central region and the first outer boundary, the first peak being spaced from the central region, and the first peak being vertically spaced from the circuit board on which the respective LED is arranged by a first distance;
a second lens portion with an outer surface extending from the second outer boundary toward the central region and having a second peak located between the central region and the second outer boundary, the second peak being spaced from the central region, and the second peak being vertically spaced from the circuit board on which the respective LED is arranged by the first distance, wherein the first lens portion intersects with the second lens portion at a region between the first lens portion and the second lens portion, and wherein the first lens portion and the second lens portion are shaped so that at least one surface normal of the first lens portion intersects with at least one surface normal of the second lens portion; and
a third lens portion disposed between the first outer boundary and the second outer boundary and having a third peak located between the third outer boundary and a region halfway between the third outer boundary and the fourth outer boundary, the third peak spaced from the region halfway between the third outer boundary and the fourth outer boundary, the third peak being vertically spaced from the circuit board on which the respective LED is arranged by a seco

Assignees

• Ultravision Tech Llc

Inventors

• Auyeung David Siucheong
• Hall William Y
• Magarill Simon

Classifications

• F21Y2105/10

  comprising a two-dimensional [2D] array of point-like light-generating elements · CPC title

• F21K9/60

  Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction · CPC title

• F21Y2105/16

  square or rectangular, e.g. for light panels · CPC title

• G02B19/0061

  the light source comprising a LED · CPC title

• F21V31/00

  Gas-tight or water-tight arrangements · CPC title