Ceramic illumination device

• US 8,894,238 B2
• Filed: 05/26/2010
• Issued: 11/25/2014
• Est. Priority Date: 05/28/2009
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Marinus, Antonius Adrianus Maria, Teerling, Omke Jan, Uitbeijerse, Bastiaan
• Primary Examiner(s): Truong, Bao Q
• Application Number:
  US13/322,704
• Publication Number:
  US 20120162988A1
• Time in Patent Office: 1,644 Days
• Field of Search: 362/249.02, 362/294, 362/373, 362/580, 362/547, 362/126, 362/218, 362/264, 362/345, 362/311.02, 362/545, 362/800
• US Class Current: 362/249.02
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 19/003 Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
• CPC Class Codes: F21V 29/71 using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
• CPC Class Codes: F21V 29/86 Ceramics or glass
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21V 3/06 characterised by the material
• CPC Class Codes: F21Y 2107/90 on two opposite sides of supports or substrates
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 33/641 characterized by the materials

Abstract

The present invention provides an illumination device (100) comprising a light source (110) arranged to generate light, a carrier (120) arranged to support the light source and an envelope (130) enclosing the light source and the carrier. Further, the carrier is arranged in thermal contact with the envelope and both the envelope and the carrier are made of ceramic material. The present invention is advantageous in that it provides an illumination device providing an effective heat transfer.

Claims

1. An illumination device comprising:

a light source arranged to generate light,

a carrier arranged to support said light source, said light source being in thermal contact with said carrier,

an envelope enclosing said light source and said carrier,

wherein the carrier is arranged in thermal contact with the envelope for dissipating heat out of said illumination device, said envelope and said carrier comprising a ceramic material,

wherein the envelope includes at least two enveloping parts which, when joined together, form said envelope, and

wherein at least one of the enveloping parts and at least part of the carrier form a single integrated part.

2. The illumination device according to claim 1, wherein said envelope comprises a first transmissive region arranged to transmit at least part of the light generated by the light source.

3. The illumination device according to claim 1, wherein said carrier comprises a second transmissive region arranged to transmit at least part of the light generated by the light source and/or a reflective region arranged to reflect at least part of the light generated by the light source.

4. The illumination device according to claim 1, wherein the ceramic material is polycrystalline aluminum oxide.

5. The illumination device according to claim 1, wherein the ceramic material has a thermal conductivity of at least about 5 W/mK.

6. The illumination device according to claim 1, wherein the envelope is bulb-shaped.

7. The illumination device according to claim 1, wherein the enveloping parts are two bulb halves.

8. The illumination device according to claim 1, wherein the carrier is arranged at a junction between the two enveloping parts.

9. The illumination device according to any one of claim 1, wherein the enveloping parts are complementary and configured to fit one to another.

10. The illumination device according to claim 1, wherein the carrier is arranged along an axis extending from the base of the illumination device to its top or along a direction crossing an axis extending from the base of the illumination device to its top.

11. The illumination device according to claim 1, wherein the light source comprises at least one light emitting diode (LED) or at least one LED package.

12. The illumination device according to claim 1, wherein the ceramic material is translucent,

13. An illumination device comprising:

a light source arranged to generate light,

a carrier arranged to support said light source, said light source being in thermal contact with said carrier,

an envelope enclosing said light source and said carrier,

wherein the carrier is arranged in thermal contact with the envelope for dissipating heat out of said illumination device, said envelope and said carrier comprising a ceramic material,

wherein the envelope includes at least two enveloping parts which, when joined together, form said envelope, and

wherein the carrier is arranged at a junction between the two enveloping parts.

14. An illumination device, comprising:

a light source operable to emit light;

a carrier in support of the light source, the light source being in thermal contact with said carrier;

a multi-part envelope enclosing said light source and said carrier,

wherein the carrier is arranged in thermal contact with the envelope for dissipating heat out of said illumination device through the envelope;

the envelope and the carrier including a ceramic material;

wherein

the multi-part envelope includes at least two enveloping parts which are joined together to form the envelope; and

the multi-part envelope including at least one enveloping part and at least part of the carrier to form a single integrated part.