LED LAMP

• US 20120300429A1
• Filed: 03/02/2012
• Published: 11/29/2012
• Est. Priority Date: 05/25/2011
• Status: Active Grant

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Seoul Semiconductor Co., Ltd.
• Inventors: JIN, Sung Ho
• Granted Patent: US 8,704,432 B2
• Time in Patent Office: Days
• US Class Current: 362/84
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• 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: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 29/50 Cooling arrangements air-treatment systems dissipating or using the heat of lighting fixtures F24F3/056
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2107/90 on two opposite sides of supports or substrates
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

Exemplary embodiments of the present invention relate to an LED lamp including a substrate, a first LED, a second LED, a heat sink, and a transparent cover. The first LED is arranged on a first surface of the substrate. The second LED is arranged on a second surface of the substrate, the second surface being an opposite side of the substrate from the first surface. The heat sink has a mounting surface on which the substrate is arranged. The heat sink also has a reflection surface. The transparent cover covers the substrate, the first LED, and the second LED.

Claims

1. A light-emitting diode (LED) lamp, comprising:

a substrate;

a first LED arranged on a first surface of the substrate;

a second LED arranged on a second surface of the substrate, the second surface being an opposite side of the substrate from the first surface;

a heat sink comprising a mounting surface, the substrate being arranged on the mounting surface; and

a transparent cover covering the substrate, the first LED, and the second LED,

wherein the heat sink further comprises a reflection surface.

2. The LED of claim 1, wherein a distal end of the transparent cover is connected to an edge of the heat sink.

3. The LED of claim 1, wherein the area of the mounting surface is less than the area of the substrate, and

wherein the second surface of the substrate is adjacent to the mounting surface.

4. The LED of claim 2, wherein the transparent cover comprises a height h, and the mounting surface is arranged at h/2.

5. The LED of claim 2, wherein the reflection surface contacts the heat sink from a first point corresponding to the edge of the mounting surface to a second point corresponding to the distal end of the transparent cover.

6. The LED of claim 5, wherein the reflection surface comprises a curved surface, which is concave with respect to a straight line between the first point and the second point of the reflection surface.

7. The LED of claim 6, wherein the slope of a first portion of the reflection surface is greater than that of a second portion of the reflection surface.

8. The LED of claim 5, wherein the reflection surface comprises a concave portion and a convex portion.

9. The LED of claim 5, wherein the reflection surface comprises a curved surface that is convex with respect to a straight line between the first point and the second point of the reflection surface.

10. The LED of claim 2, wherein the distance between sides of the transparent cover is greatest at a height level with the substrate or the second LED.

11. The LED of claim 2, wherein the transparent cover comprises a first portion and a second portion coupled to each other.

12. The LED of claim 11, wherein a boundary between the first portion and the second portion is adjacent to the edge of the substrate.

13. The LED of claim 1, wherein the transparent cover comprises a phosphor.

14. The LED of claim 1, wherein a plurality of first LEDs are arranged on the first surface of the substrate, a plurality of second LEDs are arranged along an edge of the second surface of the substrate, and the first LEDs are arranged inside the arrangement of the second LEDs.

15. The LED of claim 14, wherein the number of second LEDs is greater than that of first LEDs.

16. The LED of claim 1, wherein a plurality of second LEDs are arranged on the second surface of the substrate, a plurality of reflecting partition portions protrude in a radial direction from the reflection surface, and a mounting region for the second LEDs on the second surface of the substrate is divided into a plurality of regions by the plurality of reflecting partition portions.

17. The LED of claim 1, wherein a plurality of first LEDs are arranged on the first surface of the substrate, and a mounting region for the first LEDs on the first surface of the substrate is divided into a plurality of regions by a plurality of reflecting partition portions arranged on the first surface of the substrate.

18. The LED of claim 1, wherein a plurality of cover support ribs radially extend along a first portion of the heat sink, the transparent cover comprises a plurality of transparent cover pieces, and each of the plurality of transparent cover pieces is laterally inserted into a gap between adjacent cover support ribs.

19. The LED of claim 18, wherein a plurality of first LEDs are arranged on the first surface of the substrate, a mounting region for the first LEDs is divided into a plurality of regions by a plurality of reflecting partition portions arranged on the first surface of the substrate, and the cover support ribs comprise the reflecting partition portions.

20. The LED of claim 1, wherein the heat sink comprises an air flow path arranged in the heat sink to a first depth, the air flow path configured so that air from outside the LED may flow into the heat sink.

21. The LED of claim 20, wherein the transparent cover comprises a height h, and wherein a first end of the air flow path is arranged at h/2 of the transparent cover.

22. The LED of claim 1, wherein the reflection surface at least partially covers the second LED.

23. The LED of claim 1, wherein the sum of the areas of the second surface and the mounting surface equals the area of the first surface.

24. The LED of claim 8, wherein the reflection surface comprises a height h, and

wherein the concave portion and the convex portion form a boundary at h/2 of the reflector.

25. A light-emitting diode (LED) lamp, comprising:

a heat sink;

a substrate arranged on the heat sink, a first surface of the heat sink contacting a second surface of the substrate;

a first LED arranged on a first surface of the substrate, the first surface being an opposite side of the substrate from the first surface; and

a second LED arranged on the second surface of the substrate.

26. The LED of claim 25, wherein the heat sink comprises a reflection surface arranged on a second surface of the heat sink, the second surface being adjacent to the first surface of the heat sink.

27. The LED of claim 25, further comprising:

a transparent cover covering the substrate, the first LED, and the second LED.