LED filament and LED light bulb

Patent metadata

Field	Value
Publication number	US-12313227-B2
Application number	US-202418642164-A
Country	US
Kind code	B2
Filing date	Apr 22, 2024
Priority date	Sep 28, 2014
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

An LED light bulb is provided. The LED light bulb includes a lamp housing, a bulb base, a stem, two conductive supports, a driving circuit, and a flexible LED filament. The flexible filament includes a first LED section, a second LED section, a conductive section, a first conductive electrode, and a second conductive electrode. The first LED section is bent in a first three-dimensional curve shape. The second LED section is bent in a second three-dimensional curve shape. The conductive section includes a center point of the flexible LED filament. The flexible LED filament is bent in a third three-dimensional curve shape including the first three-dimensional curve shape, the conductive section, and the second three-dimensional curve shape. A polarity of the conductor is opposite to polarities of the first conductive electrode and the second conductive electrode.

First claim

What is claimed is:

1. An LED light bulb, comprising:
a lamp housing with a central axis;
a bulb base connected to the lamp housing;
a stem disposed in the lamp housing along the central axis of the lamp housing;
two conductive supports disposed in the lamp housing, the two conductive supports having opposite polarities;
a driving circuit disposed in the bulb base and electrically connected to the two conductive supports; and
a flexible LED filament disposed in the lamp housing and electrically connected to the two conductive supports, the flexible LED filament comprising:
a first LED section comprising a first plurality of LED chips connected in series and a first light conversion layer wrapping the first plurality of LED chips, the first LED section being bent into a first three-dimensional curve shape in the lamp housing;
a second LED section comprising a second plurality of LED chips connected in series and a second light conversion layer wrapping the second plurality of LED chips, the second LED section being bent into a second three-dimensional curve shape in the lamp housing;
a conductive section disposed between the first LED section and the second LED section, the conductive section comprising a conductor electrically connected to the first plurality of LED chips and the second plurality of LED chips, the conductor further electrically connected to one of the two conductive supports;
a first conductive electrode disposed at one end of the first LED section and electrically connected to the first plurality of LED chips and another one of the two conductive supports, a portion of the first conductive electrode and a portion of the conductor being wrapped by the first light conversion layer; and
a second conductive electrode disposed at one end of the second LED section and electrically connected to the second plurality of LED chips and the another one of the two conductive supports, the other end of the second LED section connecting the other end of the first LED section by the conductive section, a portion of the second conductive electrode and a portion of the conductor being wrapped by the second light conversion layer;
wherein the flexible LED filament is bent into a third three-dimensional curve shape in the lamp housing, the third three-dimensional curve shape comprising the first three-dimensional curve shape, the conductive section, and the second three-dimensional curve shape,
wherein the conductive section includes a center point of the flexible LED filament and a polarity of the conductor is opposite to polarities of the first conductive electrode and the second conductive electrode.

2. The LED light bulb according to claim 1 , wherein a shortest distance between one of the first plurality of LED chips of the first LED section and one of the second plurality of LED chips of the second LED section is greater than a distance between adjacent two of the first plurality of LED chips of the first LED section and greater than a distance between adjacent two of the second plurality of LED chips of the second LED section.

3. The LED light bulb according to claim 2 , wherein a length of the conductor is greater than a distance between the adjacent two of the first plurality of LED chips of the first LED section and greater than a distance between the adjacent two of the second plurality of LED chips of the second LED section.

4. The LED light bulb according to claim 3 , wherein the first plurality of LED chips of the first LED section is connected in series by wires, the second plurality of LED chips of the second LED section is connected in series by wires, the conductor is a conductive foil, and the conductor is electrically connected to one of the first plurality of LED chips of the first LED section by a wire.

5. The LED light bulb according to claim 4 , wherein a length of one of the wires connecting two of the first plurality of LED chips of the first LED section is less than a length of the conductor, and a length of one of the wires connecting two of the second plurality of LED chips of the second LED section is less than the length of the conductor.

6. The LED light bulb according to claim 5 , wherein the first light conversion layer comprises a first top layer and a first base layer, the second light conversion layer comprises a second top layer and a second base layer, the first plurality of LED chips of the first LED section is disposed between the first top layer and the first base layer, and the second plurality of LED chips of the second LED section is disposed between the second top layer and the second base layer.

7. The LED light bulb according to claim 6 , wherein a portion of the conductor is disposed between the first top layer and the first base layer, and a portion of the conductor is disposed between the second top layer and the second base layer.

8. The LED light bulb according to claim 7 , wherein the first conductive electrode is disposed between the first top layer and the first base layer, and the second conductive electrode is disposed between the second top layer and the second base layer.

9. The LED light bulb according to claim 8 , wherein a portion of the conductor is exposed from the first light conversion layer and the second light conversion layer.

10. The LED light bulb according to claim 9 , wherein a portion of the first conductive electrode is exposed from the first light conversion layer, and a portion of the second conductive electrode is exposed from the second light conversion layer.

11. The LED light bulb according to claim 10 , wherein the portion of the conductor exposed from the first light conversion layer and the second light conversion layer is electrically connected to the one of the two conductive supports, the portion of the first conductive electrode exposed from the first light conversion layer and the portion of the second conductive electrode exposed from the second light conversion layer are electrically connected to the other one of the two conductive supports.

12. The LED light bulb according to claim 11 , wherein the first three-dimensional curve shape and the second three-dimensional curve shape are axially symmetrical about the central axis of the lamp housing.

13. An LED light bulb, comprising:
a lamp housing with a central axis;
a bulb base connected to the lamp housing;
a stem disposed in the lamp housing along the central axis of the lamp housing;
two conductive supports disposed in the lamp housing, the two conductive support having opposite polarities;
a driving circuit disposed in the bulb base and electrically connected to the two conductive supports, the driving circuit comprising a first output terminal, a second output terminal and a third output terminal; and
a flexible LED filament disposed in the lamp housing and electrically connected to the two conductive supports, the flexible LED filament comprising:
a first LED section comprising a first plurality of LED chips connected in series to have a first node and a second node, wherein polarities of the first node and the second node of the first LED section are opposite, and wherein the first LED section is bent into a first three-dimensional curve shape in the lamp housing;
a second LED section comprising a second plurality of LED chips connected in series to have a third node and a fourth node, wherein polarities of the third node and the fourth node of the second LED section are opposite, the polarities of the first node and the fourth node are the same, the polarities of the second node and the third node are the same, and the second node of the first LED section is electrically connected to the third node of

Assignees

• Zhejiang Super Lighting Electric Appliance Co Ltd

Inventors

• Jiang Tao
• Wang Mingbin
• Li Yuexing
• Zhang Zhichao
• Yu Chihshan
• Xiong Aiming
• Zhou Lin
• Xu Junfeng

Classifications

• H10W90/00

  Package configurations · CPC title

• F21V3/10

  characterised by coatings · CPC title

• F21K9/238

  Arrangement or mounting of circuit elements integrated in the light source · CPC title

• F21Y2107/70

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

• F21K9/235

  Details of bases or caps, i.e. the parts that connect the light source to a fitting; Arrangement of components within bases or caps (F21K9/238 takes precedence) · CPC title