Light emitting apparatus

• US 20060164836A1
• Filed: 10/28/2004
• Published: 07/27/2006
• Est. Priority Date: 10/31/2003
• Status: Active Grant

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Wada, Satoshi, Suehiro, Yoshinobu, Ota, Akihito
• Granted Patent: US 7,607,801 B2
• Time in Patent Office: Days
• US Class Current: 362/294
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• 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 29/505 of reflectors
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/06 with parabolic curvature
• CPC Class Codes: F21V 7/08 with elliptical curvature
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21V 7/28 characterised by coatings
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/0401 Bonding areas specifically adapted for bump connectors, e.g. under bump metallisation [UBM]
• CPC Class Codes: H01L 2224/13 of an individual bump connector
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00011 Not 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 33/483 Containers
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/642 characterized by the shape

Abstract

A reflection-type light emitting apparatus has an excellent heat radiation property and allows the use of a high-power light emitting element, the minimization of a reduction in radiation efficiency of reflected light, and the focused radiation of high-output light at high efficiency. The apparatus has: a case 10 of metallic material and with an excellent heat radiation property; a reflection mirror section 11 formed fitted to the lower portion of case 10; a transparent plate 12 to cover the upper surface of case 10; heat radiation plates 13, 14 of metallic material with excellent heat conductivity and inserted inside the case 10; an LED element 2 mounted on the heat radiation plate 13; lead sections 15A, 15B fixed through an insulating layer 15a to the heat radiation plate 13 to serve as a power supply member to supply power to the LED element 2; and a spacer 16 of an insulating material to insulate the lead sections 15A, 15B from the case 10.

Claims

1. A light emitting apparatus, comprising:

a light source section comprising a solid-state light emitting element;

a power supply section that supplies power to the light source section;

a reflection section that is disposed opposite to a light extraction surface of the light source section to reflect light emitted from the light source section; and

a heat radiation section that is disposed with a heat radiation width in a back direction of the light source section.

4. The light emitting apparatus according to claim 1, wherein:

the light source section is packaged such that the solid-state light emitting element is sealed with a light transmitting material.

6. The light emitting apparatus according to claim 1, wherein:

the light source section comprises the solid-state light emitting element that is flip-chip mounted on a inorganic material board on which a conductive pattern is formed to supply power to the solid-state light emitting element and the light source section is sealed with an inorganic seal material that has a thermal expansion coefficient nearly equal to that of the inorganic material board.

7. The light emitting apparatus according to claim 6, wherein:

the inorganic seal material comprises glass.

8. The light emitting apparatus according to claim 6, wherein:

the inorganic material board seals the light emitting element while bonding in chemical reaction to the inorganic seal material.

9. The light emitting apparatus according to claim 1, wherein:

the solid-state light emitting element is sealed with the inorganic seal material with a refractive index of 1.55 or more.

12. The light emitting apparatus according to claim 1, wherein:

the heat radiation section comprises a heat radiation plate that comprises a high reflectivity surface to reflect the light.

13. The light emitting apparatus according to claim 1, wherein:

the heat radiation section comprises a heat radiation support that comprises a high thermal conductivity material and transfers to the heat radiation section heat generated from the light source section, and a heat radiation plate that transfers the heat through the heat radiation support.

15. The light emitting apparatus according to claim 1, wherein:

the power supply section comprises a metallic thin film and is disposed with a width in the back direction of the light source section and is integrated with the heat radiation section while being insulated from the heat radiation section.

16. The light emitting apparatus according to claim 15, wherein:

the power supply section comprises a metallic thin film and is sandwiched through an insulator between a plurality of heat radiation plates to compose the heat radiation section.

17. The light emitting apparatus according to claim 1, wherein:

a spectrum light with plurality of region wavelengths is radiated from the solid-state light emitting element or from the periphery of the solid-state light emitting element.

18. The light emitting apparatus according to claim 17, wherein:

a phosphor is disposed on the periphery of the solid-state light emitting element.

19. The light emitting apparatus according to claim 1, wherein:

the heat radiation section has the heat radiation width that is three times or more its thickness.

20. The light emitting apparatus according to claim 1, wherein:

the light source section including the solid-state light emitting element has a width that is within five times that of the solid-state light emitting element.

21. The light emitting apparatus according to claim 1, wherein:

the heat radiation section comprises a shape that protrudes toward a bottom of the reflection surface.

22. The light emitting apparatus according to claim 1, wherein:

the reflection surface opposite to the light source section comprises a solid angle of 2π

to 3.4 π

strad.

23. The light emitting apparatus according to claim 1, wherein:

the light source section comprises a light source with a turn-on power of 1 W or more.

24. The light emitting apparatus according to claim 1, wherein:

the reflection section comprises a resin material.

25. The light emitting apparatus according to claim 1, wherein:

the light source section comprises a plurality of solid-state light emitting elements.

26. The light emitting apparatus according to claim 1, wherein:

the light emitting apparatus comprises a plurality of the light source sections, and a plurality of the reflection sections and the heat radiation sections corresponding to the plurality of the light source sections.

27. The light emitting apparatus according to claim 1, wherein:

the plurality of the light source sections generate a plurality of emission colors.

28. The light emitting apparatus according to claim 27, wherein:

the plurality of the light source sections generate emission colors of R, G and B.

2. A light emitting apparatus, comprising:

a light source section comprising a solid-state light emitting element;

a power supply section that supplies power to the light source section;

a reflection section that is disposed opposite to a light extraction surface of the light source section to reflect light emitted from the light source section;

a heat radiation section that is disposed with a heat radiation width in a back direction of the light source section; and

a case in which the reflection section and the radiation section are placed and which externally radiates heat to be transferred from the heat radiation section.

3. The light emitting apparatus according to claim 2, wherein:

the heat radiation section comprises a same material as the case.

5. The light emitting apparatus according to claim 2, wherein:

the light source section is packaged such that the solid-state light emitting element is sealed with a light transmitting material.

10. The light emitting apparatus according to claim 2, wherein:

the case comprises a high reflectivity surface to reflect the light.

11. The light emitting apparatus according to claim 2, wherein:

the case comprises a surface that is subjected to a finishing to increase its heat radiation area.

14. A light emitting apparatus, comprising:

a light source section comprising a solid-state light emitting element,

a power supply section that supplies power to the light source section;

a reflection section that is disposed opposite to a light extraction surface of the light source section to reflect light emitted from the light source section; and

a heat radiation section that is disposed with a heat radiation width in a back direction of the light source section,

wherein the power supply section is formed with a width in the back direction of the light source section.