Illumination device and method for assembly of an illumination device

• US 9,360,203 B2
• Filed: 05/21/2010
• Issued: 06/07/2016
• 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): Neils, Peggy
• Assistant Examiner(s): GARLEN, ALEXANDER K
• Application Number:
  US13/321,848
• Publication Number:
  US 20120069570A1
• Time in Patent Office: 2,209 Days
• Field of Search: 362/257, 362/294, 362/296.01, 362/307, 362/310, 36231101-31105, 362/311.14, 362/311.15, 362/351, 362/353, 362/360, 362/249.01, 362/249.02, 362/255
• US Class Current: 1/1
• 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: F21V 19/003 Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
• CPC Class Codes: F21V 19/006 of point-like light sources, e.g. incandescent or halogen lamps, with screw-threaded or bayonet base of sources having contact pins, wires or blades F21V19/0005; of LEDs or sources mounted on printed-circuit board F21V19/001
• CPC Class Codes: F21V 29/86 Ceramics or glass
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 3/06 characterised by the material
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

The present invention discloses an illumination device (100) and a method (4000) for assembly of such an illumination device. The illumination device (100) comprises 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. The envelope comprises at least two enveloping parts which, when joined together, form the envelope. Further, the carrier is arranged in thermal contact with at least one of the enveloping parts for dissipating heat out of the illumination device. The method comprises the steps of mounting (4100) the light source in thermal contact with the carrier and enclosing (4200) the light source and the carrier with the envelope. The present invention is advantageous in that it provides a convenient design which facilitates the assembly of the illumination device. Further, the present invention is advantageous in that it provides an illumination device with improved heat transfer.

Claims

1. A bulb-shaped illumination device comprising:

at least two light sources arranged to generate light,

a carrier comprising two or more carrier parts, the carrier arranged to support said light sources, said light sources being in thermal contact with said carrier, and

a bulb-shaped envelope enclosing said light sources and said carrier within an open interior space, the envelope integrated with a threaded annular socket,

wherein said envelope comprises at least two enveloping parts which, when joined together, form said envelope and the surface of the illumination device,

wherein the carrier is arranged in thermal contact with at least one of the enveloping parts for dissipating heat from said light sources out of said illumination device, the carrier extending inwardly from the at least one enveloping part,

the carrier positioned to divide a light mixing space defined within the envelope into at least two compartments,

the light sources positioned on each side of the carrier with a first light source on a first carrier side in a first compartment and a second light source on a second carrier side in a second compartment and facing away from said first light source in an outward direction of the envelope, and

the envelope extending around the carrier and to the socket to form a heat sink and enclosing the first light source, the second light source, and the carrier and forming the bulb shape illumination device;

wherein a curved outer contour defined by the two or more carrier parts matches a curved inner contour defined by an inner surface of at least one of the enveloping parts in a direction parallel to a longitudinal axis of the bulb-shaped illumination device from a top of the illumination device to a position adjacent a portion of the at least one enveloping part that is inserted into the threaded annular socket.

2. An illumination device as defined in claim 1, wherein both the envelope and the carrier comprises ceramic material.

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

4. An illumination device according to claim 1, wherein the at least one enveloping part and at least part of the carrier form a single integrated molded part.

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

6. An illumination device according to claim 1, wherein the enveloping parts are configured to fit one to another.

7. An illumination device according to claim 1, wherein said envelope comprises a transmissive region arranged to transmit at least part of the light generated by the light sources.

8. An illumination device according to claim 1, wherein said carrier comprises a transmissive region arranged to transmit at least part of the light generated by the light sources or a reflective region arranged to reflect at least part of the light generated by the light sources.

9. An illumination device according to claim 1, wherein the light sources comprises at least one light emitting diode (LED) or at least one LED package.

10. Method for assembly of a bulb shaped illumination device comprising a plurality of light sources arranged to generate light, said method comprising the steps of:

mounting said light sources in thermal contact with a carrier comprising two or more carrier parts,

enclosing said light sources and the carrier by joining at least two enveloping parts, thereby forming a bulb shaped envelope enclosing said light sources in an open interior space, the carrier being arranged in thermal contact with at least one of the enveloping parts to dissipate heat from the light sources out of said illumination device, the joined enveloping parts forming an outer surface of the bulb shaped illumination device,

wherein the carrier defines a divided space in the envelope of at least two compartments, the light sources distributed on each side of the carrier and in each of the compartments, the light sources are positioned in each compartment facing away from each other, the joining of the enveloping parts forming the at least two compartments; and

wherein a curved outer contour defined by the two or more carrier parts matches and is in direct contact with a curved inner contour defined by an inner surface of at least one of the at least two enveloping parts in a direction parallel to a longitudinal axis of the bulb-shaped illumination device from a top of the illumination device across a portion of the bulb-shaped illumination device that is widest in a direction perpendicular to the longitudinal axis.

11. Method as defined in claim 10, further comprising the step of gluing said carrier to an enveloping part.

12. Method as defined in claim 10, wherein both the envelope and the carrier comprises ceramic material.

13. An illumination device comprising

a plurality of LEDs,

a first and second carrier dividing a light mixing space within a bulb-shaped envelope which encloses the LEDs,

the first and second carrier supporting the plurality of LEDs, the LEDs distributed on a first side of said first carrier and on a second opposing side of said second carrier, the second side of the second carrier on an opposing side of the first side of the first carrier;

the first and the second opposing sides of the carriers facing away from each other;

the first and second carrier arranged in thermal contact with the envelope for dissipating heat out of said illumination device;

the first carrier extending inwardly from a first enveloping part, the second carrier extends inwardly from a second enveloping part;

the first enveloping part and second enveloping part joined together to form the envelope, the envelope extending to a socket, the socket in electrical communication with the plurality of LEDs, the formed envelope enclosing the plurality of LEDs, the first carrier, the second carrier and forming an external surface of the illumination device;

wherein a curved outer contour defined by at least one of the first and second carriers matches and is in direct contact with a curved inner contour defined by an inner surface of at least one of the first and second enveloping parts in a direction parallel to a longitudinal axis of the illumination device from a top of the illumination device to a position adjacent a portion of the at least one enveloping part that is inserted into the socket.