LIGHTING DEVICE COMPRISING AN IMPROVED HEAT TRANSFERRING ARRANGEMENT

• US 20150292726A1
• Filed: 09/18/2013
• Published: 10/15/2015
• Est. Priority Date: 11/26/2012
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Den Boer, Reinier Imre Anton, Bukkems, Peter Johannes Martinus, Ansems, Johannes Petrus Maria
• Granted Patent: US 9,709,259 B2
• Time in Patent Office: Days
• 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 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21K 9/90 Methods of manufacture
• CPC Class Codes: F21V 14/02 by movement of light sources in vehicle head lamps F21S41/657
• CPC Class Codes: F21V 19/004 by deformation of parts or snap action mountings, e.g. using clips
• CPC Class Codes: F21V 23/005 the substrate is supporting also the light source
• CPC Class Codes: F21V 29/503 of light sources cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H01L33/64
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21Y 2107/40 on the sides of polyhedrons, e.g. cubes or pyramids
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/056 Folded around rigid support or component
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]

Abstract

The present invention relates to a lighting device (100) (100), comprising at least one light emitting element (102) configured to emit light, a housing (300) having an elongated hollow base portion (302) and a light exit portion (304), wherein the elongated hollow base portion (302) has a polygonal cross section, and a heat transferring arrangement (200) formed from a folded sheet of a thermo conducting material inserted into and fixed inside of the housing (300), the heat transferring arrangement (200) comprising a first section (202) onto which the light emitting element (102) is arranged and adapted to receive heat generated from the at least one light emitting element (102) when emitting light, and a second section (204) having an outer surface which once fixed inside of the housing (300) is formed to be in abutment with an inner surface of the elongated hollow base portion (302) of the housing (300), so that the generated heat is thermally transferred to the housing (300). The present invention also relates to a corresponding method for forming a lighting device (100).

Claims

1. A lighting device, comprising:

at least one light emitting element configured to emit light;

a housing having an elongated hollow base portion and a light exit portion, wherein the elongated hollow base portion has a polygonal cross section, and

a heat transferring arrangement formed from a folded sheet of a thermoconducting material inserted into and fixed inside of the housing, the heat transferring arrangement comprising;

a first section onto which the at least one light emitting element is arranged and adapted to receive heat generated from the at least one light emitting element when emitting light, and

a second section having an outer surface which once fixed inside of the housing is formed to be in abutment with an inner surface of the elongated hollow base portion of the housing, so that the generated heat is thermally transferred to the housing.

2. Lighting device according to claim 1, wherein an inner surface of the second section of the heat transferring arrangement is configured to receive electrical driver circuitry for controlling the at least one light emitting element.

3. Lighting device according to claim 1, wherein the heat transferring arrangement is formed from a single sheet of the thermoconducting material.

4. Lighting device according to claim 1, wherein the lighting device further comprises a core component centrally arranged in relation to the heat transferring arrangement and configured to provide an outward pressure to an inner surface of the second portion of the heat transferring arrangement once the heat transferring arrangement is fixed inside of the housing.

5. Lighting device according to claim 1, wherein the first section of the heat transferring arrangement, when fixed inside of the housing, protrudes within the light exit section of the housing.

6. Lighting device according to claim 5, wherein the first section of the heat transferring arrangement is arranged at a predetermined inward angle in relation to the second section of the heat transferring arrangement.

7. Lighting device according to claim 1, wherein the first section of the heat transferring arrangement comprises an extension portion, configured for mounting at least one light emitting element, which is arranged in a second inward angle in relation to the second section of the heat transferring arrangement.

8. Lighting device according to claim 7, wherein the inward angle of the first section of the heat transferring arrangement is controllable in relation to the second section of the heat transferring arrangement.

9. Lighting device according to claim 5, wherein the inward angle of the first section of the heat transferring arrangement is between 20°

to 80°

, configured to output an even light intensity distribution through the light exit section of the lighting device.

10. Lighting device according to claim 1, wherein the housing is made of glass, plastic, ceramic or any combinations thereof.

11. Lighting device according to claim 1, wherein the lighting device further comprises a layer of thermal interface material arranged to be sandwiched between the outer surface of the second section of the heat transferring arrangement and the inner surface of the elongated hollow base portion of the housing.

12. Method for forming a lighting device, comprising the steps of:

providing at least one light emitting element configured to emit light;

providing a housing having an elongated hollow base portion and a light exit portion, wherein the elongated hollow base portion has a polygonal cross section;

providing a heat transferring arrangement of a foldable thermoconducting sheet, the heat transferring arrangement comprising a first section onto which the at least one light emitting element is arranged, and a second section provided for transferred heat generated by the at least one light emitting element to the housing;

folding the heat transferring arrangement such that it corresponds to the polygonal cross section of the base portion of the housing;

inserting the heat transferring arrangement into the housing, and

arranging an outer surface of the heat transferring arrangement to be in abutment with an inner surface of the elongated hollow base portion of the housing.

13. Method according to claim 12, further comprising the step of:

arranging the first section of the heat transferring arrangement at a predetermined inward angle in relation to the second section of the heat transferring arrangement.

14. Method according to claim 12, further comprising the step of:

providing a centrally arranged core component around which the heat transferring arrangement is folded, wherein the core component is configured to provide an outward pressure to an inner surface of the second portion of the heat transferring arrangement once the heat transferring arrangement is fixed inside of the housing.