Semiconductor light-emitting device

• US 9,076,952 B2
• Filed: 01/14/2014
• Issued: 07/07/2015
• Est. Priority Date: 01/16/2013
• Status: Active Grant

• Current Assignee: Stanley Electric Company Limited
• Original Assignee: Stanley Electric Company Limited
• Inventors: Saito, Takao, Nozaki, Takahiko
• Primary Examiner(s): Mandala, Victor A
• Application Number:
  US14/154,821
• Publication Number:
  US 20140197445A1
• Time in Patent Office: 539 Days
• Field of Search: 257/98, 257/99
• US Class Current: 1/1
• CPC Class Codes: H01L 2224/48091 Arched
• 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 33/483 Containers
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/642 characterized by the shape

Abstract

A semiconductor light-emitting device including a favorable radiating structure can include a semiconductor light source sealed between a metallic cap having a light-emitting window and a metallic base attached on a heat sink plate. The semiconductor light-emitting device can also include a holder attaching the metallic base along the metallic cap between the holder and the heat sink plate to efficiently radiate heat generated from the light source, and a thermal interface material layer disposed between at least a top surface of the heat sink plate and an outer bottom surface of the holder so as to be able to enlarge each tolerance of parts composing the light-emitting device. Thus, the disclosed subject matter can provide semiconductor light-emitting devices including the favorable radiating structure, which can be employed for various lighting apparatuses including a headlight in a relatively small size by selecting the semiconductor light source incorporated in the devices.

Claims

1. A semiconductor light-emitting device, comprising:

a metallic cap including a light-emitting window, a first circular cylinder having a first inner diameter and a second circular cylinder having a second inner diameter, made from a metallic plate, and formed in a substantially circular cylindrical shape that overlaps the first circular cylinder on the second circular cylinder, the first inner diameter of the first circular cylinder being smaller than the second inner diameter of the second circular cylinder, the light-emitting window made of a transparent material, and being sealed using the metallic plate of the first circular cylinder;

a metallic base having a top surface, a bottom surface, a side surface and through holes made from a metallic plate, and formed in a substantially planar shape, the top surface of metallic base including an outer circumference, and also mounting the metallic cap on the top surface of the metallic base so as to expose the outer circumference of the top surface from the metallic cap;

terminal pins being hermetically sealed in a respective one of the through holes of the metallic base, respectively, and passing through the metallic base, and further extending in an opposite direction of the top surface of the metallic base;

a semiconductor light source having electrodes, a light-emitting surface and an optical axis mounted on the top surface of the metallic base, being airproofed between the metallic cap and the metallic base, the light-emitting surface of the semiconductor light source facing the light-emitting window of the metallic cap, the optical axis of the semiconductor light source intersecting with the light-emitting window of the metallic cap at a substantially right angle, and thereby operating as an optical axis of the semiconductor light-emitting device, and each of the electrodes of the semiconductor light source being electrically connected to a respective one of the terminal pins;

a heat sink plate having a top surface and a bottom surface, and the top surface of the heat sink contacting with the bottom surface of the metallic base;

a holder having an inner bottom surface, an outer bottom surface, a first flange, a second flange, an inner side surface and a body including the inner bottom surface and the inner side surface, the holder attaching the metallic base on the top surface of the heat sink plate along with the metallic cap between the inner bottom surface of the body of the holder and the top surface of the heat sink plate, and therefore the inner bottom surface of the body of the holder contacting with at least the outer circumference of the top surface of the metallic base, the first flange of the holder extending in an opposite direction of the metallic base from the body along the heat sink plate in a cross-sectional view taken along the optical axis of the device, and the second flange of the holder extending toward the first circular cylinder of the holder from the body over the second circular cylinder in the cross-sectional view taken along the optical axis of the device;

a thermal interface material (TIM) layer being disposed between the top surface of the heat sink plate and the outer bottom surface of the holder; and

a thermal conductive elastic member disposed between the side surface of the metallic base and the inner side surface of the body of the holder.

2. The semiconductor light-emitting device according to claim 1, wherein the TIM layer is made from one of a thermal conductive grease and a thermal conductive sheet.

3. The semiconductor light-emitting device according to claim 1, wherein the TIM layer includes a thermal conductive silicone.

4. The semiconductor light-emitting device according to claim 1, further comprising:

screws attaching the metallic base on the top surface of the heat sink plate along with the metallic cap between the inner bottom surface of the body of the holder and the top surface of the heat sink plate, and passing through the first flange of the holder and the TIM layer.

5. The semiconductor light-emitting device according to claim 1, wherein the light-emitting window of the metallic cap is made of at least one of a glass, a transparent resin and a lens.

6. The semiconductor light-emitting device according to claim 1, further comprising:

a radiating fin located on the bottom surface of the heat sink plate, and extending from the bottom surface of the heat sink plate in an opposite direction of the top surface of the heat sink plate.

7. The semiconductor light-emitting device according to claim 1, wherein the thermal conductive elastic member is made from one of an acrylic rubber series and a thermoplastic elastomer series.

8. The semiconductor light-emitting device according to claim 1, wherein the metallic cap is made from an alloyed material based upon Iron (Fe).

9. The semiconductor light-emitting device according to claim 1, wherein the metallic base is made from an alloyed material based upon Iron (Fe).

10. The semiconductor light-emitting device according to claim 1, wherein the metallic cap and the metallic base are made from a substantially same material.

11. A semiconductor light-emitting device, comprising:

a metallic cap including a light-emitting window made from a metallic plate, and formed in a substantially circular cylindrical shape, the light-emitting window made of a transparent material, and being sealed using the metallic plate of the metallic cap;

a metallic base having a top surface, a bottom surface, a side surface and through holes made from a metallic plate, and formed in a substantially planar shape, the top surface of metallic base including an outer circumference, and also mounting the metallic cap on the top surface of the metallic base so as to expose the outer circumference of the top surface from the metallic cap;

terminal pins being hermetically sealed in a respective one of the through holes of the metallic base, respectively, and passing through the metallic base, and further extending in an opposite direction of the top surface of the metallic base;

a semiconductor light source having electrodes, a light-emitting surface and an optical axis mounted on the top surface of the metallic base, being airproofed between the metallic cap and the metallic base, the light-emitting surface of the semiconductor light source facing the light-emitting window of the metallic cap, the optical axis of the semiconductor light source intersecting with the light-emitting window of the metallic cap at a substantially right angle, and thereby operating as an optical axis of the semiconductor light-emitting device, and each of the electrodes of the semiconductor light source being electrically connected to a respective one of the terminal pins;

a heat sink plate having a top surface and a bottom surface, and the top surface of the heat sink contacting with the bottom surface of the metallic base;

a holder having an inner bottom surface, an outer bottom surface, a flange, an inner side surface and a body including the inner bottom surface and the inner side surface, the holder attaching the metallic base on the top surface of the heat sink plate along with the metallic cap between the inner bottom surface of the body of the holder and the top surface of the heat sink plate, and therefore the inner bottom surface of the body of the holder contacting with at least the outer circumference of the top surface of the metallic base, and the flange of the holder extending in an opposite direction of the metallic base from the body along the heat sink plate in a cross-sectional view taken along the optical axis of the device;

a thermal interface material (TIM) layer being disposed between the top surface of the heat sink plate and the outer bottom surface of the holder; and

a thermal conductive elastic member being disposed between the side surface of the metallic base and the inner side surface of the body of the holder.

12. The semiconductor light-emitting device according to claim 11, wherein the TIM layer is made from one of a thermal conductive grease and a thermal conductive sheet.

13. The semiconductor light-emitting device according to claim 11, wherein the TIM layer includes a thermal conductive silicone.

14. The semiconductor light-emitting device according to claim 11, further comprising:

screws attaching the metallic base on the top surface of the heat sink plate along with the metallic cap between the inner bottom surface of the body of the holder and the top surface of the heat sink plate, and passing through the first flange of the holder and the TIM layer.

15. The semiconductor light-emitting device according to claim 11, wherein the light-emitting window of the metallic cap is made of at least one of a glass, a transparent resin and a lens.

16. The semiconductor light-emitting device according to claim 11, further comprising:

a radiating fin located on the bottom surface of the heat sink plate, and extending from the bottom surface of the heat sink plate in an opposite direction of the top surface of the heat sink plate.

17. The semiconductor light-emitting device according to claim 11, wherein the thermal conductive elastic member is made from one of an acrylic rubber series and a thermoplastic elastomer series.

18. The semiconductor light-emitting device according to claim 11, wherein the metallic cap is made from an alloyed material based upon Iron (Fe).

19. The semiconductor light-emitting device according to claim 11, wherein the metallic base is made from an alloyed material based upon Iron (Fe).

20. The semiconductor light-emitting device according to claim 11, wherein the metallic cap and the metallic base are made from a substantially same material.