Filament structure, lighting device having a filament structure, and method for producing a lighting device having a filament structure

Patent metadata

Field	Value
Publication number	US-10865947-B2
Application number	US-201816495813-A
Country	US
Kind code	B2
Filing date	Mar 20, 2018
Priority date	Mar 31, 2017
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

A filament structure, a lighting device with filament structures, a method for manufacturing a lighting device and a method for manufacturing a filament structure are disclosed. In an embodiment, a filament structure includes at least two filament elements, each of the at least two filament elements comprising a leadframe element having a first end region and a second end region and a plurality of light-emitting diodes arranged on the leadframe element, at least one connecting element connecting the first end region of one of the at least two filament elements to the first end region of another of the at least two filament elements so that the at least two filament elements are connected in series and at least one further filament element including a leadframe element comprising a first end region and a second end region and a plurality of light-emitting diodes, wherein the leadframe element of the further filament element is a part of an one-piece leadframe, wherein the first end region of the leadframe element of the further filament element is connected via the connecting element to the first end regions of the at least two filament elements and wherein the connecting element is shaped and/or bendable such that each of the filament elements of the filament structure extends along a lateral surface of an imaginary cone or pyramid.

First claim

The invention claimed is:

1. A filament structure for a lighting device comprising:
at least two filament elements, each of the at least two filament elements comprising:
a leadframe element having a first end region and a second end region; and
a plurality of light-emitting diodes arranged on the leadframe element;

at least one connecting element connecting the first end region of one of the at least two filament elements to the first end region of another of the at least two filament elements so that the at least two filament elements are connected in series; and
at least one further filament element comprising a leadframe element comprising a first end region and a second end region and a plurality of light-emitting diodes,
wherein the leadframe element of the further filament element is a part of an one-piece leadframe,
wherein the first end region of the leadframe element of the further filament element is connected via the connecting element to the first end regions of the at least two filament elements,
wherein one of the at least two filament elements and the further filament element are electrically conductively connected to one another with the second end regions so that the one of the at least two filament elements and the further filament element are connected in parallel,
wherein the second end regions are connected by a further connecting element of the one-piece leadframe and/or the second end regions are connected by a connector which is separate and independent from the one-piece leadframe,
wherein the leadframe elements of all the filament elements and the at least one connecting element form the one-piece leadframe, and
wherein the connecting element is shaped and/or bendable such that each of the filament elements of the filament structure extends along a lateral surface of an imaginary cone or pyramid.

2. The filament structure according to claim 1 , wherein the further filament element is connected in series with one of the at least two filament elements.

3. The filament structure according to claim 1 , wherein the connector comprises a leadframe.

4. The filament structure according to claim 1 , wherein the connector is stretchable in at least one direction.

5. The filament structure according to claim 4 , wherein the connector comprises a stretch-lattice.

6. The filament structure according to claim 1 , wherein each of the at least two filament elements is connected in parallel with the at least one further filament element.

7. The filament structure according to claim 1 , wherein the filament structure has at least two connection regions between which a current path passes through the at least two filament elements during operation of the filament structure.

8. The filament structure according to claim 1 , wherein the filament structure is electrically connectable via exactly two connection regions so that all filament elements are arranged along a current path between the exactly two connection regions.

9. A lighting device comprising:
at least one filament structure according to claim 1 , wherein the at least one filament structure comprises an electrical connection configured to be connected to an external energy source,
wherein the at least the connecting element of the at least one filament structure is shaped and/or bent such that each of the filament elements of the filament structure extends along a lateral surface of an imaginary cone or pyramid,
wherein the cone or pyramid has a base area and an apex, and
wherein the base area faces the electrical connection and the apex faces away from the electrical connection.

10. The lighting device according to claim 9 , wherein the lighting device has at least two filament structures connected to one another in series.

11. The lighting device according to claim 10 , wherein the at least two filament structures are connected in series via the connector.

12. The lighting device according to claim 9 , wherein the electrical connection is configured to be mounted and electrically connected in a conventional lamp socket.

13. The lighting device according to claim 9 , wherein the at least one filament structure is soldered to at least one electrical supply line of the electrical connection.

14. A method comprising:
providing at least one filament structure according to claim 1 ;
bending and/or shaping at least the connecting element of the at least one filament structure such that each of the filament elements of the filament structure extends along a lateral surface of an imaginary cone or pyramid; and
connecting the at least one filament structure to at least one electrical supply line of an electrical connection.

15. The method according to claim 14 , wherein connecting the at least one filament structure to the at least one electrical supply line comprises connecting by soldering.

Assignees

• Osram Opto Semiconductors Gmbh
• Osram Oled Gmbh

Inventors

• Kudaev Sergey
• Afshar Farhang Ghasemi
• Sorg Jörg Erich
• Dobner Andreas

Classifications

• H10W90/00

  Package configurations · CPC title

• F21Y2107/70

  on flexible or deformable supports or substrates, e.g. for changing the light source into a desired form · CPC title

• F21K9/90

  Methods of manufacture · CPC title

• F21K9/232 Primary

  specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title