Lighting device and vehicle lamp having same

Patent metadata

Field	Value
Publication number	US-12416830-B2
Application number	US-202218690808-A
Country	US
Kind code	B2
Filing date	Sep 16, 2022
Priority date	Sep 17, 2021
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

The lighting device disclosed at an embodiment of the invention includes a substrate; a first reflective layer disposed on the substrate and having a plurality of reflection patterns; a light source disposed on the substrate; a resin layer disposed on the first reflective layer, and a second reflective layer disposed on the resin layer and having a plurality of holes, wherein an arrangement form of the plurality of holes is the same as that of the plurality of reflection patterns.

First claim

The invention claimed is:

1. A lighting device comprising:
a substrate;
a first reflective layer disposed on the substrate and having a plurality of reflection patterns;
a light source disposed on the substrate;
a resin layer disposed on the first reflective layer; and
a second reflective layer disposed on the resin layer and having a plurality of holes,
wherein an arrangement form of the plurality of holes is a same as an arrangement form of the plurality of reflection patterns,
wherein the plurality of reflection patterns and the plurality of holes overlap in one region in a direction perpendicular to an upper surface of the substrate,
wherein a size of at least one of the holes is smaller than a size of at least one of the reflection patterns in the overlapping region, and
wherein the plurality of holes include a region where a size of the holes increases as a distance from the light source in an emission direction of the light source increases.

2. The lighting device of claim 1 ,
wherein the arrangement form of the plurality of holes includes n columns,
wherein the arrangement form of the plurality of reflection patterns includes m columns,
wherein m and n are integers of one or more and are a same or different from each other.

3. The lighting device of claim 1 ,
wherein the plurality of holes includes a first hole and a second hole in a first column among n columns, and a first hole and a second hole in a second column among the n columns,
wherein an interval between the first hole and the second hole in the first column is equal to or smaller than an interval between the first hole in the first column and the first hole in the second column,
wherein the first column is disposed closer to an emission surface of the light source than the second column.

4. The lighting device of claim 1 ,
wherein the first reflective layer includes a first reflective film,
wherein the plurality of reflection patterns is disposed on the first reflective film,
wherein the plurality of reflection patterns is covered with a lower portion of the resin layer.

5. The lighting device of claim 1 ,
wherein the second reflective layer includes a transparent film and a second reflective film disposed on the transparent film,
wherein the plurality of holes is penetrated through the second reflective film,
wherein the second reflective film includes a metal film having the plurality of holes.

6. The lighting device of claim 1 ,
wherein the plurality of reflection patterns includes a region where a size of the reflection patterns increases as a distance from the light source in an emission direction of the light source increases,
wherein a total area of the plurality of holes is smaller than a total area of a reflective region of the second reflective layer.

7. The lighting device of claim 1 ,
wherein the light source includes a plurality of LEDs,
wherein the plurality of LEDs is arranged to emit light in a first direction.

8. The lighting device of claim 1 ,
wherein the light source includes a plurality of LEDs,
wherein the plurality of LEDs includes a first LED to emit light in a first direction, and a second LED to light a second direction opposite to the first direction,
wherein a number or size of the plurality of holes disposed adjacent to an emission surface of the first LED is different from a number or size of the plurality of holes disposed adjacent to an emission surface of the second LED.

9. The lighting device of claim 1 ,
wherein a thickness of the resin layer is 2.7 mm or less,
wherein the lighting device emits red light.

10. The lighting device of claim 1 ,
wherein an overlap ratio between the plurality of holes and the plurality of reflective patterns ranges from 60% to 98% in the direction perpendicular to the upper surface of the substrate.

11. A lighting device comprising:
a substrate;
a first reflective layer disposed on the substrate and having a plurality of reflection patterns;
a light source disposed on the substrate;
a resin layer disposed on the first reflective layer;
a second reflective layer disposed on the resin layer and having a plurality of holes,
wherein the plurality of holes includes a region where a number of holes per unit area increases as a distance from the light source in an emission direction of the light source increases,
wherein the plurality of reflection patterns and the plurality of holes overlap in one region in a direction perpendicular to an upper surface of the substrate, and
wherein a size of at least one of the holes is smaller than a size of at least one of the reflection patterns in the overlapping region.

12. The lighting device of claim 11 ,
wherein each of the plurality of holes is a same size,
wherein each of the plurality of reflection patterns is a same size,
wherein the plurality of reflection patterns includes a region where a number of reflection patterns per unit area increases as a distance from the light source in an emission direction of the light source increases.

13. The lighting device of claim 11 ,
wherein each of the plurality of holes is a same size,
wherein the plurality of reflection patterns includes a region where a size of the reflection patterns increases as a distance from the light source in an emission direction of the light source increases.

14. The lighting device of claim 11 ,
wherein the first reflective layer includes a first reflective film,
wherein the plurality of reflective patterns is disposed on the first reflective film,
wherein the plurality of reflective patterns is covered with a lower portion of the resin layer.

15. The lighting device of claim 14 ,
wherein the second reflective layer includes a transparent film and a second reflective film disposed on the transparent film,
wherein the plurality of holes is penetrated through the second reflective film.

16. The lighting device of claim 15 ,
wherein the second reflective film includes a metal film.

17. A lighting device comprising:
a first reflective layer having a plurality of reflection patterns;
a second reflective layer having a plurality of holes;
a resin layer disposed between the first reflective layer and the second reflective layer; and
a light source that provides light to an inside or outside of the resin layer,
wherein the second reflective layer includes a region in which at least one of a size or an interval of the holes changes as a distance from the light source in an emission direction of the light source increases,
wherein the second reflective layer includes a reflective film having the plurality of holes on the resin layer,
wherein the plurality of holes penetrates from an upper surface of the reflective film toward the resin layer,
wherein at least one or at least one column of the plurality of holes overlaps at least one of the reflection patterns in a vertical direction,
wherein the reflective film is made of metal,
wherein the size of at least one of the holes is 20 times or less than a wavelength emitted from the light source,
wherein the plurality of holes has an overlap ratio of 50% or more with the plurality of reflection patterns, and
wherein at least one of the plurality of holes has an overlap ratio with vertically overlapping at least one of the reflection patterns in a range of 1% to 100%.

18. The lighting device of claim 17 ,
wherein a thickness of the resin layer is 2.7 mm or less,
wherein the lighting device emits red light.

Assignees

• Lg Innotek Co Ltd

Inventors

• Lim Eay Jin
• Kim Seong Jin

Classifications

• F21S43/28135

  Structures encapsulating the light source · CPC title

• F21V7/05

  plane · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21Y2105/16

  square or rectangular, e.g. for light panels · CPC title

• G02F1/133605

  including specially adapted reflectors · CPC title