Light emitting device and light unit using the same

• US 8,598,616 B2
• Filed: 10/20/2010
• Issued: 12/03/2013
• Est. Priority Date: 10/21/2009
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Lee, Gun Kyo
• Primary Examiner(s): Mandala, Victor A
• Application Number:
  US13/388,342
• Publication Number:
  US 20120126280A1
• Time in Patent Office: 1,140 Days
• Field of Search: 257/99, 257/706, 257/796, 257/E33.075, 257/E23.101, 257/E23.104
• US Class Current: 257/99
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/641 characterized by the materials
• CPC Class Codes: H01L 33/642 characterized by the shape

Abstract

Disclosed are a light emitting device and a light unit using the same. The light emitting device includes a body, a light emitting diode installed in the body, a plurality of lead frames disposed in the body and electrically connected to the light emitting diode; and a heat dissipation member received in the body, thermally connected to the light emitting diode, and having a plurality of heat dissipation fins exposed from a lower surface of the body.

Claims

1. A light emitting device comprising:

a heat sink including a support, a connection portion and a plurality of fins, the connection portion provided between the support and the plurality of fins, the plurality of fins extending from the connection portion in a first direction;

a body provided around the heat sink, a first portion of the fins being provided in the body and a second portion of the fins extending outside of the body in the first direction;

first and second lead frames disposed in the body and spaced apart from the heat sink; and

a light emitting diode disposed on the support of the heat sink, thermally connected to the support portion, and electrically connected to the first and second lead frames,

wherein the body includes a cavity,

wherein the light emitting diode is connected to the first and second lead frames disposed in the cavity through a wire, and a molding member is provided to fill the cavity.

2. The light emitting device of claim 1, wherein the connection portion has a dimension different from a dimension of the support, the dimensions being in a second direction, which is different from the first direction.

3. The light emitting device of claim 2, wherein a spacing in the second direction between ends of the first and second lead frames provided in the body is less than the dimension of the connection portion.

4. The light emitting device of claim 2, wherein at least a portion of first and second lead frames is disposed over the connection portion.

5. The light emitting device of claim 1, wherein a dimension of the first portion in the first direction is greater than a dimension of the second portion in the first direction.

6. The light emitting device of claim 1, wherein the heat sink includes at least one of a metallic material or a resin material.

7. The light emitting device of claim 1, wherein the fins have at least one of a plate shape or a cylindrical shape.

8. The light emitting device of claim 1, wherein the molding member covers the light emitting diode, the first and second lead frames, and the support of the heat sink.

9. The light emitting device of claim 1, wherein a dimension of the heat sink in the first direction is at least greater than a dimension between a bottom surface of the cavity and a lower surface of the body in the first direction.

10. The light emitting device of claim 1, wherein a part of the first and second lead frames extending in direction outward from a bottom surface of the cavity is protruded from the outside of the body.

11. The light emitting device of claim 1, further comprising a printed board under the body.

12. The light emitting device of claim 1, further comprising a solder provided between the fins of the heat sink.

13. The light emitting device of claim 11, further comprising a circuit pattern having a plurality of pads spaced apart from each other on the printed board, wherein the pads are connected to the first lead frame, the second lead frame, and the heat dissipation member.

14. The light emitting device of claim 11, wherein the second portion of the fins extend into the printed board.

15. A light emitting device comprising:

a heat sink including a support, a connection portion and a plurality of fins, the connection portion provided between the support and the plurality of fins, the plurality of fins extending from the connection portion in a first direction;

a body provided around the heat sink, a first portion of the fins being provided in the body and a second portion of the fins extending outside of the body in the first direction;

first and second lead frames disposed in the body and spaced apart from the heat sink; and

a light emitting diode disposed on the support of the heat sink, thermally connected to the support portion, and electrically connected to the first and second lead frames,

wherein the body includes a cavity having an open upper portion, and the first and second lead frames and the heat dissipation member are disposed on at least a bottom surface of the cavity,

wherein a part of the first and second lead frames extending in direction outward from a bottom surface of the cavity is protruded from the outside of the body.

16. The light emitting device of claim 15, wherein the connection portion has a dimension different from a dimension of the support, the dimensions being in a second direction, which is different from the first direction.

17. The light emitting device of claim 16, wherein a spacing in the second direction between ends of the first and second lead frames provided in the body is less than the dimension of the connection portion.

18. The light emitting device of claim 16, wherein at least a portion of first and second lead frames is disposed over the connection portion, and

wherein the heat sink includes at least one of a metallic material or a resin material.

19. A light emitting device comprising:

a heat sink including a support, a connection portion and a plurality of fins, the connection portion provided between the support and the plurality of fins, the plurality of fins extending from the connection portion in a first direction;

a body provided around the heat sink, a first portion of the fins being provided in the body and a second portion of the fins extending outside of the body in the first direction;

first and second lead frames disposed in the body and spaced apart from the heat sink; and

a light emitting diode disposed on the support of the heat sink, thermally connected to the support portion, and electrically connected to the first and second lead frames,

wherein the body includes a cavity,

wherein the first and second lead frames and the support of the heat sink are disposed on a bottom surface of the cavity and are located at a lower position than a lower surface of the light emitting diode,

wherein the plurality of fins of the heat sink are extended in a vertical direction from the connection of the heat sink.

20. The light emitting device of claim 19, further comprising a molding member in the cavity,

wherein the light emitting diode is connected to the first and second lead frames disposed in the cavity

wherein a part of each of the first and second lead frames is extended in direction outward in the body.