Lighting module and lighting device having same

• US 10,648,626 B2
• Filed: 04/21/2017
• Issued: 05/12/2020
• Est. Priority Date: 04/29/2016
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Hwang, Seong Jin
• Primary Examiner(s): Bowman, Mary Ellen
• Application Number:
  US16/096,022
• Publication Number:
  US 20190137052A1
• Time in Patent Office: 1,117 Days
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21S 2/005 of modular construction
• CPC Class Codes: F21S 41/148 the main emission direction of the LED being perpendicular to the optical axis
• CPC Class Codes: F21S 41/151 arranged in one or more lines
• CPC Class Codes: F21S 41/285 Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28
• CPC Class Codes: F21S 41/337 the reflector having a structured surface, e.g. with facets or corrugations
• CPC Class Codes: F21S 41/338 the reflector having surface portions added to its general concavity
• CPC Class Codes: F21S 41/36 Combinations of two or more separate reflectors
• CPC Class Codes: F21S 43/00 Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
• CPC Class Codes: F21S 43/14 Light emitting diodes [LED]
• CPC Class Codes: F21S 43/26 Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
• CPC Class Codes: F21S 43/31 Optical layout thereof
• CPC Class Codes: F21S 43/40 characterised by the combination of reflectors and refractors
• CPC Class Codes: F21S 45/47 Passive cooling, e.g. using fins, thermal conductive elements or openings
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 7/0083 Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane combination of two or more reflectors F21V7/0025
• CPC Class Codes: F21V 7/048 with facets structure
• CPC Class Codes: F21V 7/09 with a combination of different curvatures
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 : Light-emitting diodes [LED]

Abstract

A lighting module disclosed in an embodiment comprises: a plurality of light emitting devices on a substrate; and a reflector arranged in the direction of emission of light from each light emitting device on the substrate. The light emitting device has a light exit surface, and the reflector has a reflecting surface concave toward the substrate, at least a portion of the reflecting surface corresponding to the light exit surface of the light emitting device. The reflecting surface is arranged at a height that increases gradually in proportion to the interval from the light emitting device arranged in the light incident direction. The reflecting surface comprises a plurality of convex portions arranged in a first direction and first bridge portions that connect between the plurality of convex portions. The first bridge portions are arranged along the convex portions and are arranged to be lower than a straight line that connect high points of adjacent convex portions. The convex portions and the first bridge portions have the same length in a second direction, which is perpendicular to the first direction, and the area of the convex portions may be larger than the area of the first bridge portions.

Claims

1. A lighting module comprising:

a substrate;

a plurality of light emitting devices disposed on the substrate; and

a reflector disposed in a light-emitting direction of each of the plurality of light emitting devices on the substrate,

wherein the light emitting device has an exit surface emitting light,

the reflector has a reflective surface concave toward the substrate, at least a portion of which corresponds to the exit surface of the light emitting device,

the reflective surface is disposed at a gradually higher height as it is farther from the light emitting device disposed in an incident direction,

the reflective surface includes a plurality of convex portions arranged in a first direction and first bridge portions connecting between the plurality of convex portions,

the first bridge portions are disposed along the convex portions,

the first bridge portions are disposed to be lower than a straight line connecting high points of adjacent convex portions,

the convex portions and the first bridge portions have the same length in a second direction orthogonal to the first direction,

an area of the convex portions is larger than that of the first bridge portions,

wherein the reflective surface of the reflector includes an open region in which a lower region adjacent to the light emitting device is opened in the incident direction,

wherein the open region has a recess corresponding to a center portion of the exit surface of the light emitting device, and

wherein the recess is recessed deeper in an emission direction of the light emitting device.

2. The lighting module of claim 1, wherein the reflective surface includes concave portions disposed between the convex portions, which are arranged in the first direction, and the first bridge portions, and the convex portions include a convex curved surface or an inclined surface.

3. The lighting module of claim 2, wherein the reflective surface includes a plurality of second bridge portions disposed in the first direction,

the concave portions include an inclined surface or a curved surface,

the concave portions and the first bridge portions have the same length in the second direction, and

the plurality of second bridge portions cross the first bridge portions.

4. The lighting module of claim 1, wherein the reflective surface has a deeper depth as it is adjacent to a center portion,

the depth is an interval in a straight line connecting opposite edges in the first direction and opposite edges in the second direction,

the first bridge portions have a number smaller than that of the convex portions arranged in the first direction, and

an interval between the first bridge portions is the same or is gradually narrower as it is farther from the light emitting device.

5. The lighting module of claim 1,

wherein a length in the second direction is greater than that in the first direction in the open region, and

a length of the open region in the second direction is greater than that of the light emitting device in the second direction.

6. The lighting module of claim 5,

wherein a maximum length of the recess in the second direction is smaller than a length of the light emitting device in the second direction.

7. The lighting module of claim 1, wherein an interval between the plurality of light emitting devices is disposed to be longer than a bottom length of the reflector disposed between the light emitting devices,

an inner portion of the reflector is spaced apart from the substrate, and

the reflector is formed of a resin material and has a support sidewall supported at the substrate.

8. The lighting module of claim 1, wherein a portion of the reflector connects between the reflectors or is disposed to be overlapped with the light emitting device.

9. The lighting module of claim 1, wherein a lower end of the reflective surface is disposed to be lower than an optical axis of the light emitting device, or is disposed to be lower than an upper surface of the substrate.

10. The lighting module of claim 1, wherein the reflector has a coupling portion protruding toward the substrate.

11. A lighting module comprising:

a substrate;

a plurality of light emitting devices disposed on the substrate in a first direction; and

a plurality of reflectors disposed on the substrate in the first direction,

wherein each of the plurality of reflectors has a reflective surface concave toward an upper surface of the substrate,

wherein each of the plurality of light emitting devices includes a front portion facing the reflective surface of the each of the plurality of reflectors and a rear portion opposite to the front portion,

wherein the each of the plurality of reflectors is spaced apart from the front portion and the rear portion of the each of the light emitting devices,

wherein a bottom of the each of the reflectors includes a length less than an interval between the light emitting devices in the first direction,

wherein each reflective surface of the reflectors includes a lower region adjacent to the front portion of the each of the light emitting devices and an upper region having a height higher than a height of the lower region,

wherein the upper region of the reflective surface has the height higher than a height of an upper surface of the light emitting device,

wherein the front portion of the light emitting device includes an exit surface facing the lower region of the reflective surface of the each of the reflectors, and

wherein the exit surface of the light emitting device is disposed in a direction perpendicular to the upper surface of the substrate.

12. The lighting module of claim 11, wherein the reflective surface has a higher height as a distance from light emitting device increases, and

wherein the reflective surface includes a plurality of convex portions having a convex curved surface.

13. The lighting module of claim 12, wherein the plurality of convex portions are disposed between a lower end and an upper end of the reflective surface of the reflector, and

wherein the each of the plurality of convex portions extends in a second direction orthogonal to the first direction.

14. The lighting module of claim 11, wherein the plurality of reflectors do not overlap in a vertical direction with each of the light emitting devices.

15. The lighting module of claim 11, wherein the light emitting device and the reflector are alternately arranged in the first direction.

16. The lighting module of claim 11, wherein the each of the light emitting devices comprises:

a body having a cavity in the front portion and formed of resin;

a plurality of lead frames in the cavity; and

a light emitting chip disposed on at least one of the plurality of lead frames,

wherein an upper surface of the body has a lower height than that of the upper region of the reflector, and

wherein the each of the light emitting devices has a length in the first direction smaller than a width in a second direction.

17. The lighting module according to claim 11, wherein the reflective surface includes a plurality of convex portion and a first bridge portion connecting between the plurality of convex portions,

wherein the first bridge portion extends in the second direction orthogonal to the first direction along the convex portions, and

wherein an area of an upper surface of the convex portion is greater than an area of upper surface of the first bridge portion.

18. The lighting module of claim 17, wherein the reflective surface includes a first reflective surface disposed between the light emitting devices, a second and third reflective surfaces disposed on both sides of the first reflective surface and extending in the second direction from the first reflective surface.

19. The lighting module of claim 17, wherein the lower region of the reflective surface of the reflector includes an open area spaced from the light emitting device,

wherein the open region has a length greater than a length of the front portion of the light emitting device and is open from a lower end of the reflective surface, and

wherein an edge of the open area has a curve.

20. The lighting module of claim 19, wherein the open region has a recess corresponding to a central portion of the exit surface of the light emitting device, and

wherein the recess is recessed deeper in a region corresponding to a central portion of the light emitting device.