Light emitting module and optical lens thereof

Patent metadata

Field	Value
Publication number	US-11656497-B2
Application number	US-202117329140-A
Country	US
Kind code	B2
Filing date	May 25, 2021
Priority date	May 25, 2021
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

An optical lens includes an optical transparent body which has an upper surface, a lower surface, a lateral surface and a lower concave portion. The upper surface includes a central upper concave portion, an outwardly-concave curved surface continuous from the central upper concave portion, and an inwardly-concave curved surface continuous from the outwardly-concave curved surface. The lateral surface is connected between the inwardly-concave curved surface and the lower surface. The lower concave portion is recessed from the lower surface.

First claim

What is claimed is:

1. An optical lens comprising:
an optical transparent body comprising:
an upper surface comprising a central upper concave portion, an outwardly-convex curved surface continuous from the central upper concave portion, and an inwardly-concave curved surface continuous from the outwardly-convex curved surface;
a lower surface;
a lateral surface connected between the inwardly-concave curved surface and the lower surface, wherein a first interface between the inwardly-concave curved surface and the lateral surface is closer to the lower surface than a curved interface between the outwardly-convex curved surface and the inwardly-concave curved surface, wherein the inwardly-concave curved surface is configured to refract light beams downwards; and
a lower concave portion recessed from the lower surface.

2. The optical lens of claim 1 , wherein the optical transparent body comprises a refractive index greater than 1.5.

3. The optical lens of claim 1 , wherein the upper surface is defined by a plurality of concentric circumferences disposed from the central upper concave portion to the lateral surface.

4. The optical lens of claim 3 , wherein a first concentric circumference of the plurality of concentric circumferences defines a second interface between the central upper concave portion and the outwardly-convex curved surface.

5. The optical lens of claim 4 , wherein a last concentric circumference of the plurality of concentric circumferences defines the first interface between the inwardly-concave curved surface and the lateral surface.

6. The optical lens of claim 5 , wherein one concentric circumference between the first and last concentric circumferences defines the curved interface between the outwardly-convex curved surface and the inwardly-concave curved surface.

7. The optical lens of claim 1 , wherein a point of inflection connects the outwardly-convex curved surface and the inwardly-concave curved surface.

8. The optical lens of claim 1 , wherein the lower concave portion is disposed centrally of the lower surface and aligned with the central upper concave portion.

9. A light emitting module comprising:
a substrate;
a light-emitting element disposed on the substrate; and
the optical lens of claim 1 , wherein the light-emitting element is housed within the lower concave portion of the optical transparent body.

10. The light emitting module of claim 9 further comprising an optical transparent media filled within the lower concave portion of the optical transparent body.

11. An optical lens comprising:
an optical transparent body comprising:
an upper surface comprising a central upper concave portion and a curved surface continuous from the central upper concave portion, wherein the curved surface comprises an outwardly-convex curved surface continuous from the central upper concave portion, and an inwardly-concave curved surface continuous from the outwardly-convex curved surface;
a lower surface;
a lateral surface connected between the curved surface and the lower surface;
a lower concave portion recessed from the lower surface, wherein the lower concave portion comprises a light incident surface, and the light incident surface has a top surface and a curved sidewall surface continuous from the top surface and connecting to the lower surface, wherein a curvature of the top surface is greater than that of the curved sidewall surface, the top surface surrounds and defines a first hollow space, and the curved sidewall surface surrounds and defines a second hollow space, wherein the inwardly-concave curved surface is configured to refract light beams from the light incident surface downwards; and
an optical transparent media filled within the second hollow space and not filled within the first hollow space.

12. The optical lens of claim 11 , wherein the top surface is a hemispherical surface.

13. The optical lens of claim 11 , wherein the lower concave portion is disposed centrally of the lower surface and aligned with the central upper concave portion.

14. The optical lens of claim 11 , wherein the lateral surface is substantially perpendicular to an edge of the lower surface.

15. The optical lens of claim 11 , wherein the lower concave portion is defined by a relatively small circumference and a relatively large circumference, wherein the relatively large circumference defines an interface between the curved sidewall surface and the lower surface.

16. The optical lens of claim 15 , wherein the relatively small circumference defines an interface between the top surface and the curved sidewall surface.

17. A light emitting module comprising:
a substrate;
a light-emitting element disposed on the substrate; and
the optical lens of claim 11 , wherein the light-emitting element is housed within the lower concave portion of the optical transparent body.

18. The light emitting module of claim 17 , wherein the optical transparent media comprises a refractive index smaller than that of the optical transparent body.

19. A light emitting module comprising:
a substrate;
a plurality of light-emitting diode chips disposed on the substrate in a flip-chip manner; and
a plurality of optical lenses respectively over the light-emitting diode chips and disposed in contact with the substrate, the optical lenses each having an optical transparent body comprising:
an upper surface comprising a central upper concave portion, an outwardly-convex curved surface continuous from the central upper concave portion, and an inwardly-concave curved surface continuous from the outwardly-convex curved surface;
a lower surface;
a lateral surface connected between the inwardly-concave curved surface and the lower surface, wherein a first interface between the inwardly-concave curved surface and the lateral surface is closer to the lower surface than a curved interface between the outwardly-convex curved surface and the inwardly-concave curved surface; and
a lower concave portion recessed from the lower surface, wherein a corresponding one of the light-emitting diode chips is housed within the lower concave portion of the optical transparent body.

20. The light emitting module of claim 19 , wherein the lower concave portion comprises a light incident surface, and the light incident surface has a top surface and a curved sidewall surface extending downwards from a bottom of the top surface to a bottom of the curved sidewall surface, the curved sidewall surface is continuously curved from a top to the bottom of the curved sidewall surface, the lower surface extends laterally from the bottom of the curved sidewall surface to a bottom of the lateral surface, and an entirety of the lower surface is flat.

Assignees

• Lextar Electronics Corp

Inventors

• Lai Lung-Kuan
• Chen Ting-Kai
• Lin Jiun-Hong

Classifications

• G02F1/133611

  including means for improving the brightness uniformity · CPC title

• G02F1/133607 Primary

  the light controlling member including light directing or refracting elements, e.g. prisms or lenses · CPC title

• G02F1/133603 Primary

  with LEDs · CPC title