Lamp comprising a flexible printed circuit board

• US 10,362,679 B2
• Filed: 05/22/2013
• Issued: 07/23/2019
• Est. Priority Date: 06/04/2012
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Signify Holding B.V. (Signify N.V.)
• Inventors: Gielen, Vincent Stefan David
• Primary Examiner(s): Harris, William N
• Application Number:
  US14/405,174
• Publication Number:
  US 20150156884A1
• Time in Patent Office: 2,253 Days
• Field of Search: 362363, 362294, 362240, 36227901
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 3/0615 the material diffusing light, e.g. translucent glass
• CPC Class Codes: F21V 3/0625 the material diffusing light, e.g. translucent plastics
• 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 2201/10106 Light emitting diode [LED]

Abstract

The present invention relates to a lamp (1) comprising at least two solid state light sources (9), a envelope (2) comprising a light transmittable surface (3) adapted to transmit light from the solid state light sources, a heat sink (4) extending from inside the envelope to the outer surface of the envelope such that it divides the envelope into at least two compartments (16), and a flexible printed circuit (7) at which the solid state light sources are mounted. The flexible printed circuit is attached to the heat sink such that the solid state light sources are distributed in both of the compartments. The present invention is advantageous in that manufacturing, and in particular assembly, of the lamp is facilitated since the number of components to assemble is reduced and the need of soldering (e.g. of wires to circuit boards) is reduced.

Claims

1. A lamp comprising:

at least two solid state light sources;

an envelope comprising a light transmittable surface adapted to transmit light from the solid state light sources;

a heat sink extending from inside the envelope to the light transmittable surface of the envelope such that it divides the envelope into at least two compartments; and

a flexible printed circuit at which the solid state light sources are mounted and which is adapted to be connected to driving electronics of the lamp, wherein the flexible printed circuit comprises a plurality of leg portions and a mid-portion, wherein the plurality of leg portions of the flexible printed circuit are integrally formed with and extend from the mid-portion of the flexible printed circuit, and wherein each leg portion is respectively arranged in one of the compartments and an outer surface of each leg portion is substantially concave,

wherein at least two of the leg portions of the flexible printed circuit are each attached to the heat sink such that the solid state light sources are distributed in the compartments.

2. A lamp as defined in claim 1, wherein the flexible printed circuit covers a major part of the heat sink surface inside the envelope.

3. A lamp as defined in claim 1, wherein the light transmittable surface is divided into sub areas by the heat sink.

4. A lamp as defined in claim 3, wherein the sub areas and the heat sink are arranged in an interdigitated configuration.

5. A lamp as defined in claim 1, wherein the heat sink comprises recesses extending towards a longitudinal axis of the lamp.

6. A lamp as defined in claim 1, wherein the flexible printed circuit comprises a reflective solder resist.

7. A lamp as defined in claim 1, wherein the flexible printed circuit is attached to the heat sink by means of an adhesive.

8. A lamp, comprising:

at least two solid state light sources;

an envelope comprising a light transmittable surface adapted to transmit light from the solid state light sources;

a heat sink extending from inside the envelope to the light transmittable surface of the envelope such that it divides the envelope into at least two compartments such that the at least two compartments are separated by one or more walls of the heat sink; and

a flexible printed circuit at which the solid state light sources are mounted and which is adapted to be connected to driving electronics of the lamp, wherein the flexible printed circuit comprises a plurality of leg portions and a mid-portion, wherein the plurality of leg portions of the flexible printed circuit are integrally formed with and extend from the mid-portion of the flexible printed circuit, and wherein each leg portion is respectively arranged in one of the compartments,

wherein at least two of the leg portions of the flexible printed circuit are each attached to the heat sink such that the solid state light sources are distributed in the compartments and each of the at least two of the leg portions has approximately a same size as the corresponding compartment to which it is attached.