Packaged light emitting devices including multiple index lenses and multiple index lenses for packaged light emitting devices
View Patent ↗A packaged light emitting device includes a substrate, a solid state light emitting device on the substrate, a first generally toroidal lens on the substrate and defining a cavity relative to the solid state light emitting device and having a first index of refraction, and a second lens at least partially within the cavity formed by the first lens and having a second index of refraction that is different from the first index of refraction. The second index of refraction may be higher than the first index of refraction. The lenses may be mounted on the substrate and/or may formed by dispensing and curing liquid encapsulant materials.
1. A packaged light emitting device, comprising:
a substrate;
a solid state light emitting device on the substrate;
a first lens on the substrate and defining a cavity and having a first index of refraction; and
a second lens positioned at least partially within the cavity formed by the first lens and having a second index of refraction that is different from the first index of refraction;
wherein the first lens comprises a molded lens, and wherein the second index of refraction is higher than the first index of refraction;
wherein the first lens comprises a convex mating surface on an inside surface of the first lens and the second lens comprises a concave mating surface on an outside surface of the second lens, wherein the convex mating surface of the first lens matches a shape of the concave mating surface of the second lens.
2. The packaged light emitting device of claim 1 , further comprising an encapsulant material between the solid state light emitting device and the second lens.
3. The packaged light emitting device of claim 1 , wherein the substrate comprises a leadframe or a printed circuit board, wherein the packaged light emitting device further comprises a molded body on the substrate, and wherein the first lens is on the molded body.
4. The packaged light emitting device of claim 3 , wherein the molded body includes at least one surface that extends along a surface of the substrate and at least one vertical sidewall extending from the surface and defining a mounting location for the first lens.
5. The packaged light emitting device of claim 3 , wherein the molded body extends at least partially through the leadframe.
6. The packaged light emitting device of claim 1 , wherein the first lens includes a first mating surface and the second lens includes a second mating surface that is in contact with the first mating surface of the first lens.
7. The packaged light emitting device of claim 1 , wherein the second lens is attached to the first lens using an adhesive encapsulant.
8. The packaged light emitting device of claim 7 , wherein the adhesive encapsulant has an index of refraction that is substantially the same as the first index of refraction or the second index of refraction.
9. The packaged light emitting device of claim 1 , further comprising a third lens positioned on the second lens and having a third index of refraction.
10. The packaged light emitting device of claim 9 , wherein the third index of refraction is higher than the first index of refraction.
11. The packaged light emitting device of claim 10 , wherein the third index of refraction is higher than the second index of refraction.
12. The packaged light emitting device of claim 10 , wherein the third index of refraction is higher than the first index of refraction and is the same as the second index of refraction.
13. A solid state luminaire comprising a packaged light emitting device as recited in claim 1 .
14. A backlight panel for a display comprising a packaged light emitting device as recited in claim 1 .
15. The packaged light emitting device of claim 1 , wherein both the first lens and the second lens comprise silicone.
16. A lens for a packaged light emitting device, comprising:
a generally toroidal side lens defining a cavity therein and having a first index of refraction and including a convex mating surface on an inside surface of the side lens; and
a core lens positioned at least partially within the cavity formed by the side lens and having a second index of refraction that is different from the first index of refraction and having a concave mating surface on an outside surface of the core lens, wherein the convex mating surface of the side lens matches a shape of the concave mating surface of the core lens.
17. The lens of claim 16 , wherein the second index of refraction is higher than the first index of refraction.
18. The lens of claim 16 , further comprising a third lens positioned on the second lens and having a third index of refraction.
19. The lens of claim 18 , wherein the third index of refraction is higher than the first index of refraction.
20. The lens of claim 19 , wherein the third index of refraction is higher than the second index of refraction.
21. The lens of claim 19 , wherein the third index of refraction is higher than the first index of refraction and is the same as the second index of refraction.
22. The lens of claim 16 , wherein both the side lens and the core lens comprise molded silicone.