Lighting device comprising circuit board

Patent metadata

Field	Value
Publication number	US-11397001-B2
Application number	US-201916563493-A
Country	US
Kind code	B2
Filing date	Sep 6, 2019
Priority date	Sep 7, 2018
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

Lighting devices and methods of manufacturing lighting devices are described. A lighting devices includes at least one thermally conductive element, at least one lighting module thermally coupled to the at least one thermally conductive element, and an overmould at least partially encasing the at least one thermally conductive element, the overmould comprising at least one receiving portion. The at least one circuit board is mounted in the at least one receiving portion and is at least partially exposed from the overmould. The at least one circuit board includes at least one connector and at least two bond pads. The at least one connector includes surface accessible conduction lines.

First claim

What is claimed is:

1. A lighting device, comprising:
a thermally conductive element;
an overmould partially encasing the at least one thermally conductive element with at least a mounting region of the thermally conductive element exposed from the overmould, the overmould comprising at least one receiving portion;
at least one lighting module on the mounting region of the thermally conductive element;
at least one circuit board mounted in the at least one receiving portion and at least partially exposed from the overmould, the at least one circuit board being a separate board from the lighting module, being spaced apart from the lighting module and comprising at least one connector and at least two bond pads, the at least one connector comprising surface accessible conduction lines; and
conductive connectors electrically coupling the at least two bond pads on the at least one circuit board to the lighting module on the mounting region of the thermally conductive element.

2. The lighting device according to claim 1 , wherein the overmould comprises at least one alignment pin in engagement with the circuit board.

3. The lighting device according to claim 1 , further comprising an adhesive between the at least one circuit board and the overmould.

4. The lighting device according to claim 1 , further comprising at least one screw mechanically coupled to the at least one circuit board and the overmould.

5. The lighting device according to claim 1 , wherein the at least one connector and the at least two bond pads are disposed on opposite sides of the circuit board, and the circuit board further comprises vias formed therein and electrically coupled between the at least one connector and the at least two bond pads.

6. The lighting device according to claim 1 , further comprising openings in the circuit board configured for electrical coupling to an external direct connector-plug.

7. The lighting device according to claim 6 , wherein the openings comprise at least one of cut outs, holes and slits.

8. The lighting device according to claim 1 , further comprising at least two single addressable lighting modules.

9. The lighting device according to claim 1 , wherein the at least one circuit board further comprises at least one of: at least one thermistor, at least one bin code resistor, at least one protecting capacitor, and at least one transient voltage suppressor diode.

10. The lighting device according to claim 9 , wherein the at least one thermistor includes at least one of a negative temperature coefficient thermistor and a positive temperature coefficient thermistor.

11. The lighting device according to claim 1 , wherein the at least one thermally conductive element comprises at least one of a heat sink and a lead frame.

12. A method for producing a lighting device, the method comprising:
providing at least one thermally conductive element comprising a mounting region;
arranging at least one lighting module on the mounting region of the thermally conductive element such that the at least one lighting module is thermally coupled to the at least one thermally conductive element;
overmoulding the at least one thermally conductive element such that the at least one thermally conductive element is partially encased in the overmould with the mounting region of the thermally conductive element at least partially exposed from the overmould and the overmould comprises at least one circuit board receiving portion;
arranging at least one circuit board in the at least one circuit board receiving portion, the at least one circuit board being a separate board from the lighting module, being spaced apart from the lighting module and comprising at least one connector and at least two bond pads, the at least one connector comprising surface accessible conduction lines; and
electrically coupling the lighting module on the mounting region of the thermally conductive element to the at least two bond pads on the at least one circuit board using conductive connectors.

13. The method of claim 12 , wherein the electrically connecting comprises one of ribbon and wire bonding the lighting module to the at least one circuit board.

14. The method according to claim 12 , wherein the circuit board receiving portion comprises at least one alignment pin, and the arranging the at least one circuit board comprises arranging the at least one circuit board such that the at least one alignment pin engages the at least one circuit board.

15. The method according to claim 14 , further comprising hot stacking the at least one circuit board to the overmould via the at least one alignment pin.

16. The method according to claim 12 , further comprising gluing the circuit board to the overmould.

17. The method of claim 12 , further comprising screwing the at least one circuit board to the overmould.

18. The method of claim 12 , further comprising mounting at least one lighting module to the mounting region of the thermally conductive element.

19. The lighting device of claim 1 , wherein the thermally conductive element is a substantially H-shaped thermally conductive element.

20. The lighting device of claim 19 , wherein the substantially H-shaped thermally conductive element comprises two substantially parallel portions and a cross bar between the two substantially parallel portions, the mounting region comprises at least a portion of the cross bar, and the receiving portion includes portions of each of the two substantially parallel portions and the cross bar and a region partially enclosed by the two substantially parallel portions and the cross bar.

Assignees

• Lumileds Llc
• Marelli Automotive Lighting Reutlingen Germany Gmbh

Inventors

• Mertens Juergen
• Henninger Georg
• Stang Andreas
• Harder Anna

Classifications

• H05K2201/10606

  Permanent holder for component or auxiliary printed circuits mounted on a printed circuit board [PCB] · CPC title

• F21V23/006

  the substrate being distinct from the light source holder · CPC title

• F21S45/47

  Passive cooling, e.g. using fins, thermal conductive elements or openings · CPC title

• F21V23/06 Primary

  the elements being coupling devices {, e.g. connectors} · CPC title

• F21V17/005

  with keying means, i.e. for enabling the assembling of component parts in distinctive positions, e.g. for preventing wrong mounting · CPC title