LED device having a dome lens

Patent metadata

Field	Value
Publication number	US-9755120-B2
Application number	US-201213482676-A
Country	US
Kind code	B2
Filing date	May 29, 2012
Priority date	Sep 7, 2007
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A light emitting device comprises an LED die, a dome lens encapsulating the LED die, the dome lens having a first outer curved surface, and a photopolymerizable composition disposed on the dome lens. The photopolymerizable composition forms a meniscus lens defined by a second outer curved surface and an inner curved surface, the inner curved surface being in contact with only a portion of the first outer curved surface. The dome lens and the meniscus lens in combination form an elongated dome lens.

First claim

What is claimed is:

1. A light emitting device, comprising:
an LED die;
a dome lens encapsulating the LED die against a substantially planar surface, the dome lens having a first outer curved surface; and
a photopolymerizable composition disposed on the dome lens, the photopolymerizable composition forming a meniscus lens defined by a second outer curved surface and an inner curved surface, the inner curved surface being in contact with only a portion of the first outer curved surface and allowing a substantially circumferential outer portion of the dome lens to be exposed intermediate the meniscus lens and the substantially planar surface;
wherein an edge of an outer surface of the meniscus lens is substantially flush, forming a smooth curvature, with an outer surface of the dome lens, such that the dome lens and the meniscus lens in combination form a continuous elongated dome lens; and
wherein the photopolymerizable composition contacts no component of the light emitting device other than the dome lens.

2. The device of claim 1 , wherein the dome lens is made of a different material than the photopolymerizable composition.

3. The device of claim 1 , wherein the photopolymerizable composition comprises a metal-containing catalyst and a silicon-containing resin comprising silicon-bonded hydrogen and aliphatic unsaturation.

4. The device of claim 3 , wherein the silicon-containing resin comprises a first organosiloxane having units of the formula:
R 1 a H c SiO (4−a−c)/2
wherein:
R i is a monovalent, straight-chained, branched or cyclic, unsubstituted or substituted, hydrocarbon group that is free of aliphatic unsaturation and has from 1 to 18 carbon atoms;
a is 0, 1, 2, or 3;
c is 0, 1, or 2; and
the sum of a+c is 0, 1, 2, or 3;
with the proviso that there is on average at least one silicon-bonded hydrogen present per molecule.

5. The device of claim 1 , wherein the photopolymerizable composition is substantially Newtonian and has a viscosity of from about 100 to about 15,000 cP at 25° C.

6. The device of claim 1 , further comprising a substrate on which the LED die is disposed.

7. A light emitting device, comprising:
an LED die;
a dome lens encapsulating the LED die against a substantially planar surface, the dome lens having a first outer curved surface; and
a photopolymerized material disposed on the dome lens, the photopolymerized material forming a meniscus lens defined by a second outer curved surface and an inner curved surface, the inner curved surface being in contact with only a portion of the first outer curved surface and allowing a substantially circumferential outer portion of the dome lens to be exposed intermediate the meniscus lens and the substantially planar surface;
wherein an edge of an outer surface of the meniscus lens is substantially flush, forming a smooth curvature, with an outer surface of the dome lens, such that the dome lens and the meniscus lens in combination form a continuous elongated dome lens; and
wherein the photopolymerized material contacts no component of the light emitting device other than the dome lens.

8. The device of claim 7 , wherein the dome lens is made of a different material than the photopolymerized material.

9. The device of claim 7 , wherein the photopolymerized material comprises an elastomer.

10. The device of claim 7 , wherein the photopolymerized material comprises a non-elastic solid.

11. The device of claim 7 , further comprising a substrate on which the LED die is disposed.

12. A light emitting device, comprising:
an LED die disposed on a support structure;
a dome lens encapsulating the LED die against a substantially planar top surface of the support structure, the dome lens contacting the support structure and having a first outer curved surface; and
a photopolymerized material disposed on the dome lens, the photopolymerized material forming a meniscus lens defined by a second outer curved surface and an inner curved surface;
wherein the photopolymerized material contacts the dome lens along the inner curved surface without contacting the support structure and wherein a substantially circumferential outer portion of the dome lens is exposed intermediate the meniscus lens and the substantially planar top surface;
wherein an edge of an outer surface of the meniscus lens is substantially flush, forming a smooth curvature, with an outer surface of the dome lens, such that the dome lens and the meniscus lens in combination form a continuous elongated dome lens; and
wherein the photopolymerized material contacts no component of the light emitting device other than the dome lens.

13. The device of claim 12 , wherein the dome lens is made of a different material than the photopolymerized material.

14. The device of claim 12 , wherein the photopolymerized material comprises an elastomer.

15. The device of claim 12 , wherein the photopolymerized material comprises a non-elastic solid.

Assignees

• Thompson D Scott
• Kecman Fedja
• 3M Innovative Properties Co

Inventors

• Thompson D Scott
• Kecman Fedja

Classifications

• H01L2924/00014

  Electricity · mapped topic

• H01L2224/48091

  Electricity · mapped topic

• H01L33/56

  Electricity · mapped topic

• H01L33/54 Primary

  Electricity · mapped topic

• H10H20/854

  characterised by their material, e.g. epoxy or silicone resins · CPC title