Billboard and lighting assembly with heat sink and three-part lens

Patent metadata

Field	Value
Publication number	US-9542870-B2
Application number	US-201615216595-A
Country	US
Kind code	B2
Filing date	Jul 21, 2016
Priority date	Jul 30, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A lighting assembly includes a substantially planar substrate and a number of light emitting diodes (LEDs) arranged in rows on a first surface of the substrate. The rows extend along a longitudinal axis of the substrate. The lighting assembly also includes a number of optical elements, each including a three-part lens. Each optical element is proximate an associated LED such that each optical element overlies a single LED and each LED underlies a single optical element. A heat sink is thermally coupled to a second surface of the substrate that is opposite the first surface. The heat sink has a first section substantially parallel to the substrate and a number of fins extending away from the first section and substantially perpendicular thereto. A longitudinal axis of each fin is substantially perpendicular to the longitudinal axis of the substrate.

First claim

What is claimed is:

1. An apparatus comprising a lighting assembly for illumination of an area, the lighting assembly comprising:
a substantially planar substrate;
a plurality of light emitting diodes (LEDs) arranged in a plurality of rows on a first surface of the substrate, the rows extending along a longitudinal axis in a plane of the first surface of the substrate;
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 such that each optical element overlies a single LED and each LED underlies a single optical element, each optical element comprising a first part, a second part and a third part, wherein the first part comprises a first curved surface, wherein the second part comprises a second curved surface that intersects with the first curved surface at a region between the first part and the second part, wherein the first part and the second part each have a peak relative to the substrate, the peak being spaced from the region between the first part and the second part, and wherein the third part extends beyond the region between the first part and the second part in a direction away from the associated LED; and
a heat sink thermally coupled to a second surface of the substrate, the second surface opposite the first surface, the heat sink comprising a first section substantially parallel to the substrate so that each and every LED is separated from the heat sink by the substrate, the heat sink further comprising a plurality of fins extending away from the first section and substantially perpendicular thereto, each fin extending along an axis in the plane of the first surface of the substrate, the axis for each fin being substantially perpendicular to the longitudinal axis of the first surface of the substrate.

2. The apparatus of claim 1 , wherein substantially planar substrate comprises a single substrate.

3. The apparatus of claim 1 , wherein each optical element of the plurality of optical elements is separate from other optical elements of the plurality of optical elements.

4. The apparatus of claim 1 , wherein the heat sink comprises a discrete heat sink.

5. The apparatus of claim 1 , wherein the heat sink comprises an aluminum heat sink.

6. The apparatus of claim 1 , wherein the fins are substantially flat.

7. The apparatus of claim 1 , wherein the LEDs are arranged in only two rows.

8. The apparatus of claim 1 , further comprising a power supply that is separated from the substrate.

9. 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, the fins extending in a direction away from the billboard.

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

11. The apparatus of claim 1 , further comprising a billboard comprising the area, wherein the optical elements are configured so that failure of one or more LEDs of the lighting assembly will cause an illumination level of light impinging the area to decrease while a uniformity of the light impinging the area remains substantially the same as compared to when all LEDs are operational.

12. An apparatus comprising a lighting assembly for illumination of an area, the lighting assembly comprising:
a substantially planar substrate;
a plurality of light emitting diodes (LEDs) arranged in a plurality of rows on a first surface of the substrate, wherein the LEDs are arranged in only two rows, the rows extending along a longitudinal axis in a plane of the first surface of the substrate;
a plurality of optical elements attached to the substrate by threaded fasteners, 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 is proximate an associated LED of the plurality of LEDs such that each optical element overlies a single LED and each LED underlies a single optical element, wherein each optical element includes a first part, a second part and a third part, wherein the first part comprises a first curved surface, wherein the second part comprises a second curved surface that intersects with the first curved surface at a region between the first part and the second part, wherein the first part and the second part each have a peak relative to the substrate, the peak being spaced from the region between the first part and the second part, and wherein the third part extends beyond the region between the first part and the second part in a direction away from the associated LED;
a heat sink thermally coupled to a second surface of the substrate, the second surface opposite the first surface, the heat sink comprising a first section substantially parallel to the substrate so that each and every LED is separated from the heat sink by the substrate, the heat sink further comprising a plurality of fins extending away from the first section and substantially perpendicular thereto, each fin extending along an axis in the plane of the first surface of the substrate, the axis for each fin being substantially perpendicular to the longitudinal axis of the first surface of the substrate, and wherein the first section of the heat sink includes a portion that extends past the substrate in a direction away from the fins; and
a power supply that is separated from the substrate.

13. A billboard comprising:
a support structure;
a display surface mounted on the support structure; and
a lighting assembly located so as to be able to illuminate a portion of the display surface during operation, wherein the lighting assembly comprises:
a substantially planar substrate;
a plurality of light emitting diodes (LEDs) arranged in a plurality of rows on a first surface of the substrate;
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 such that each optical element overlies a single LED and each LED underlies a single optical element, wherein each optical element includes a first part, a second part and a third part, wherein the first part comprises a first curved surface, wherein the second part comprises a second curved surface that intersects with the first curved surface at a region between the first part and the second part, wherein the first part and the second part each have a peak relative to the substrate, the peak being spaced from the region between the first part and the second part, and wherein the third part extends beyond the region between the first part and the second part in a direction away from the associated LED; and
a heat sink thermally coupled to a second surface of the substrate, the second surface opposite the first surface, the heat sink comprising a first section substantially parallel to the substrate so that each and every LED of the plurality of LEDs is separated from the heat sink by the substrate, the heat sink further comprising a plurality of fins extending away from the first section and substantially perpendicular thereto, wherein the first section of the heat sink includes a portion that extends past the substrate in a direction away from the fins.

14. The billboard of claim 13 , wherein the rows of LEDs extend along a longitudinal axis in a plane of the first surface of the substrate, and wherein each fin extends along an axis in the

Assignees

• Ultravision Tech Llc

Inventors

• Auyeung David Siucheong
• Hall William Y
• Magarill Simon

Classifications

• F21V29/74

  with fins or blades · CPC title

• F21V29/503

  of light sources (cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H10H20/858) · CPC title

• G09F2013/222

  with LEDs · CPC title

• G02B19/0066

  in the form of an LED array · CPC title

• F21V23/002

  Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm · CPC title