Light-emitting module and light unit having thereof

Patent metadata

Field	Value
Publication number	US-10186643-B2
Application number	US-201515532913-A
Country	US
Kind code	B2
Filing date	Nov 27, 2015
Priority date	Dec 5, 2014
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

A light-emitting module provided in an embodiment comprises: a circuit board; a light-emitting diode arranged on the circuit board; an optical lens arranged on the light-emitting diode; a reflective sheet arranged between the optical lens and the circuit board; and an adhesive layer arranged between the reflective sheet and the circuit board, wherein the optical lens comprises: an incident surface having a recessed part on the light-emitting diode; a reflective surface for reflecting light incident on the incident surface; and a light-emitting surface arranged on the outer circumference thereof, wherein the reflective sheet includes an open area in which the light-emitting diode is arranged and the open area has a width wider than the width of the light-emitting diode and narrower than the width of the incident surface of the optical lens.

First claim

The invention claimed is:

1. A light-emitting module comprising:
a circuit board;
a light emitting device disposed on the circuit board;
an optical lens disposed on the light emitting device;
a reflective sheet disposed between the optical lens and the circuit board; and
an adhesive layer disposed between the reflective sheet and the circuit board,
wherein the optical lens includes a bottom surface, an incident surface having a concave portion recessed from a bottom surface on the light emitting device, a reflective surface for reflecting a light incident on the incident surface, and an exit surface disposed at an outer circumference thereof,
wherein the reflective sheet includes an open region in which the light emitting device is disposed,
wherein the open region of the reflective sheet has a width, which is wider than a width of the light emitting device and narrower than a width of the incident surface of the optical lens in a first direction,
wherein the bottom surface of the optical lens is spaced apart from a top surface of the reflective sheet, and
wherein the reflective sheet has a width wider than a width of the optical lens and wider than a width of the circuit board in the first direction, and
wherein an inner side of the reflective sheet faces a plurality of lateral surfaces of the light emitting device through an air space.

2. The light-emitting module of claim 1 , wherein the open region of the reflective sheet has an outer shape identical to an outer shape of the light emitting device.

3. The light-emitting module of claim 1 , wherein the open region of the reflective sheet includes a circular shape or a polygonal shape.

4. The light-emitting module of claim 1 , wherein the open region of the reflective sheet includes a plurality of curved surfaces having mutually different curvatures,
wherein the plurality of curved surfaces includes a first curved surface having a first curvature corresponding to a lateral surface of the light emitting device and a second curved surface having a second curvature corresponding to a corner region of the light emitting device, and
wherein the first curvature of the first curved surface is greater than the second curvature of the second curved surface.

5. The light-emitting module of claim 1 , wherein a side of the open region of the reflective sheet has the same interval from at least two lateral surfaces of the light emitting device.

6. The light-emitting module of claim 1 , wherein the inner side of the reflective sheet includes a stepped structure or an inclined surface with respect to the top surface of the reflective sheet.

7. The light-emitting module of claim 1 , wherein a side of the open region of the reflective sheet includes an inclined surface with respect to the top surface of the reflective sheet.

8. The light-emitting module of claim 1 , wherein the circuit board includes a metal layer, an insulating layer on the metal layer, a circuit layer having a plurality of lead electrodes electrically connected to the light emitting device on the insulating layer,
wherein the light emitting device includes: a light emitting chip having a light emitting structure having an active layer, a substrate on the light emitting structure, and a reflective electrode layer under the light emitting structure, and
wherein a height of the top surface of the reflective sheet is higher than that of a top surface of the light emitting chip.

9. The light-emitting module of claim 8 , wherein the light emitting device includes a phosphor layer disposed on a surface of the light emitting chip, and
wherein the height of the top surface of the reflective sheet is equal to or lower than that of a top surface height of the phosphor layer.

10. The light-emitting module of claim 9 , wherein the phosphor layer is disposed on the top surface and a lateral surface of the light emitting chip.

11. The light-emitting module of claim 9 , wherein a lower portion of the optical lens includes a plurality of support protrusions coupled to the circuit board through the reflective sheet, and
wherein the plurality of support protrusions is disposed at an outer region of the open region.

12. The light-emitting module of claim 9 , wherein the plurality of lead electrodes includes first and second lead electrodes under the light emitting device,
wherein a lower portion of the light emitting chip includes first and second connection electrodes overlapped vertically with the first and second lead electrodes of the circuit board, and
wherein the first and second lead electrodes are electrically connected to the first and second connection electrodes of the light emitting chip.

13. The light-emitting module of claim 12 , wherein the circuit board includes a protective layer of a reflective material disposed under the open region of the reflective sheet.

14. The light-emitting module of claim 12 , wherein a plurality of optical lenses and a plurality of reflective sheets are disposed on the circuit board in a second direction orthogonal to the first direction, and
wherein the plurality of reflective sheets is spaced apart from each other.

15. The light-emitting module of claim 1 , wherein the concave portion of the optical lens overlaps vertically with an inner portion of the top surface of the reflective sheet, and
wherein the reflective sheet has a length smaller than a length of the circuit board in a second direction orthogonal to the first direction.

16. The light-emitting module of claim 15 , wherein an outer shape of the reflective sheet is a circular, elliptic, or polygonal shape.

17. A light unit comprising:
a circuit board;
a plurality of light emitting devices disposed on the circuit board;
a plurality of optical lenses disposed on each of the light emitting devices and the circuit board, respectively;
a plurality of reflective sheets disposed between each of the optical lenses and the circuit board, respectively; and
an adhesive layer disposed between each of the reflective sheets and the circuit board,
wherein the optical lens includes a bottom surface, an incident surface having a concave portion recessed from a bottom surface on the light emitting device and an exit surface for emitting a light incident on the incident surface thereof,
wherein the reflective sheet has an inner side facing a lateral surface of the light emitting device under the concave portion,
wherein the bottom surface of the optical lens is spaced apart from a top surface of the reflective sheet,
wherein the reflective sheet has a width wider than a width of the circuit board in a first direction,
wherein the reflective sheet has a length smaller than a length of the circuit board in a second direction orthogonal to the first direction,
wherein the reflective sheet has an area greater than that of the bottom surface of the optical lens,
wherein a lower portion of the optical lens includes a plurality of support protrusions coupled to the circuit board through the reflective sheet,
wherein inner sides of the reflective sheet face a plurality of lateral surfaces of the light emitting device, and
wherein an area between the inner side of the reflective sheet and the light emitting device is an air space.

18. The light unit of claim 17 , wherein an open region of the reflective sheet includes a circular shape or a polygonal shape.

19. The light unit of claim 17 , wherein an outer portion of the reflective sheet is disposed outwardly from the bottom surface of the optical lens, and
wherein an inner por

Assignees

• Lg Innotek Co Ltd

Inventors

• Kang Min Soo

Classifications

• H10W90/00

  Package configurations · CPC title

• H01L33/382

  Electricity · mapped topic

• H01L33/58 Primary

  Electricity · mapped topic

• G02B17/0856

  comprising a refractive element with a reflective surface, the reflection taking place inside the element, e.g. Mangin mirrors · CPC title

• H01L33/62

  Electricity · mapped topic