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CN-122029375-A - LED filament comprising a filament portion

CN122029375ACN 122029375 ACN122029375 ACN 122029375ACN-122029375-A

Abstract

An LED filament (100) configured to emit LED filament light (105) in operation, the LED filament comprising a first LED filament portion (120 a) and a second LED filament portion (120 b), the first LED filament portion (120 a) having a first elongated light transmissive carrier (130 a) comprising a first main surface (140 a), the second LED filament portion (120 b) having a second elongated light transmissive carrier (130 b) comprising a second main surface (140 b), wherein the first and second LED filament portions extend parallel to a length axis LX of the LED filament, wherein a first edge portion (200 a) of the first LED filament portion is connected to a second edge portion (200 b) of the second LED filament portion, wherein the first main surface and the second main surface define an angle α in a circumferential direction C perpendicular to the length axis LX, the angle satisfying 220 ° -310 °.

Inventors

  • T. Van Bommel
  • J.P.M. Anthums

Assignees

  • 昕诺飞控股有限公司

Dates

Publication Date
20260512
Application Date
20241003
Priority Date
20231017

Claims (15)

  1. 1. A light emitting diode, LED, filament (100) configured to emit, in operation, LED filament light (110), the LED filament being composed of a first LED filament portion (120 a) and a second LED filament portion (120 b), wherein The first LED filament portion (120 a) includes: a first elongated light transmissive carrier (130 a) comprising a first major surface (140 a); An array of a plurality of first LEDs (150 a) arranged on the first major surface, wherein the plurality of first LEDs is configured to emit first LED light (160 a), A first elongated encapsulant (170 a) comprising at least one of a first luminescent material configured to at least partially convert the first LED light emitted by the plurality of first LEDs into first converted light (180 a) and a first light scattering material configured to at least partially scatter the first LED light into first scattered light (181 a), wherein the first elongated encapsulant at least partially covers the first major surface and at least partially encloses the array of the plurality of first LEDs, The second LED filament portion (120 b) includes: a second elongated light transmissive carrier (130 b) comprising a second major surface (140 b), An array of a plurality of second LEDs (150 b) arranged on the second major surface, wherein the plurality of second LEDs is configured to emit second LED light (160 b), A second elongated encapsulant (170 b) comprising at least one of a second luminescent material configured to at least partially convert the second LED light emitted by the plurality of second LEDs into second converted light (180 b) and a second light scattering material configured to at least partially scatter the second LED light into second scattered light (181 b), wherein the second elongated encapsulant at least partially covers the second major surface and at least partially encloses the array of the plurality of second LEDs, wherein The first LED filament portion and the second LED filament portion extend parallel to a length axis LX of the LED filaments, A first edge portion (200 a) of the first elongated light transmissive carrier and a second edge portion (200 b) of the second elongated light transmissive carrier are connected, wherein the first edge portion extends parallel to the length axis LX, wherein the second edge portion extends parallel to the length axis LX, whereby the first LED filament portion and the second LED filament portion are connected such that the LED filament has a V-shape in a cross section perpendicular to the length axis LX of the LED filament, and The first and second main surfaces define an angle in a circumferential direction C perpendicular to the length axis LX Said angle is Meets 220 degrees or less ≤310°。
  2. 2. The LED filament of claim 1, wherein 230 ° -ltoreq ≤260°。
  3. 3. The LED filament according to claim 1 or 2, wherein the first elongated light transmissive carrier and the second elongated light transmissive carrier are unitary.
  4. 4. The LED filament according to claim 1 or 2, wherein the first and second elongated light transmissive carriers are attached to each other at the first and second edge portions by connectors.
  5. 5. The LED filament according to any of the preceding claims, wherein the first elongated encapsulant comprises the first luminescent material and the second elongated encapsulant comprises the second luminescent material, and wherein the first luminescent material has a first phosphor composition and the second luminescent material has a second phosphor composition, wherein the first phosphor composition and the second phosphor composition are the same.
  6. 6. The LED filament according to any one of claims 1 to 4, wherein the first elongated encapsulant comprises the first luminescent material and the second elongated encapsulant comprises the second luminescent material, and wherein the first luminescent material has a first phosphor composition and the second luminescent material has a second phosphor composition, wherein the first phosphor composition is different from the second phosphor composition.
  7. 7. The LED filament according to any of the preceding claims, Wherein the first LED filament portion further comprises: A third elongated encapsulant (170 c) comprising at least one of a third luminescent material and a third light scattering material, the third luminescent material configured to at least partially convert at least one of the first LED light and the first converted light into third converted light (182 a); The third light scattering material is configured to at least partially scatter at least one of the first LED light and the first scattered light as third scattered light (183 a), Wherein the third elongated encapsulant at least partially covers a first back surface (300 a) of the first elongated light transmissive carrier opposite the first major surface, And wherein the second LED filament portion further comprises: A fourth elongated encapsulant (170 d) comprising at least one of a fourth luminescent material and a fourth light scattering material, the fourth luminescent material configured to at least partially convert at least one of the second LED light and the second converted light into fourth converted light (182 b), The fourth light scattering material is configured to scatter at least one of the second LED light and the second scattered light at least partially into fourth scattered light (183 b), Wherein the fourth elongated encapsulant at least partially covers a second back surface (300 b) of the second elongated light transmissive carrier opposite the second major surface.
  8. 8. The LED filament of claim 7, wherein the third elongated encapsulant comprises the third luminescent material and the fourth elongated encapsulant comprises the fourth luminescent material, and wherein the third luminescent material has a third phosphor composition and the fourth luminescent material has a fourth phosphor composition, wherein the third phosphor composition and the fourth phosphor composition are the same.
  9. 9. The LED filament according to claim 7 or 8, wherein at least one of the following is satisfied: The third elongated encapsulant and the fourth elongated encapsulant have a phosphor concentration that is lower than the phosphor concentration of the first elongated encapsulant and the second elongated encapsulant, and The thickness of the third elongated encapsulant and the fourth elongated encapsulant is lower than the thickness of the first elongated encapsulant and the second elongated encapsulant.
  10. 10. The LED filament according to any one of claims 1 to 6, further comprising: A fifth elongated encapsulant (170 e) disposed between a first back surface of the first elongated light transmissive carrier opposite the first major surface and a second back surface of the second elongated light transmissive carrier opposite the second major surface, wherein the fifth encapsulant comprises at least one of a fifth luminescent material or a fifth light scattering material, The fifth luminescent material is configured to at least partially convert at least one of: The first converted light is converted into light which is converted into light, The second converted light is then converted into light, The first LED light, and The second LED light is used for emitting a second light, The fifth light scattering material is configured to at least partially scatter at least one of: The first light that is scattered by the first light source, The second scattered light is directed to the light source, The first LED light, and The second LED light.
  11. 11. The LED filament according to any one of claims 7 to 9, further comprising: A fifth elongated encapsulant (170 e) disposed between the third elongated encapsulant and the fourth elongated encapsulant, wherein the fifth elongated encapsulant comprises at least one of a fifth luminescent material or a fifth light scattering material, The fifth luminescent material is configured to at least partially convert at least one of: the third converted light is then converted into light, The third scattered light is directed to the light source, The fourth converted light, and The fourth scattered light is directed to the first light source, The fifth light scattering material is configured to at least partially scatter at least one of: the third converted light is then converted into light, The third scattered light is directed to the light source, The fourth converted light, and The fourth scattered light.
  12. 12. The LED filament according to any one of claims 9 to 11, wherein the fifth elongated encapsulant is prismatic and has a wedge-shaped cross-section perpendicular to the length axis LX.
  13. 13. The LED filament according to any of the preceding claims, wherein the first LED filament portion is configured to provide a first LED filament portion light in operation and the second LED filament portion is configured to provide a second LED filament portion light in operation, wherein the first LED filament portion light is a first white light having a first correlated color temperature CCT1 in the range 1700K to 6500K and the second LED filament portion light is a second white light having a second correlated color temperature CCT2 in the range 1700K to 6500K, and wherein |cct2-cct1|+.300K.
  14. 14. An LED filament arrangement configured to emit LED filament arrangement light in operation, the LED filament arrangement comprising: The at least one LED filament of any of the preceding claims, wherein the first plurality of LEDs comprises a first plurality of LED subsets, and wherein the second plurality of LEDs comprises a second plurality of LED subsets, A controller coupled to the first and second pluralities of LED subsets, wherein the controller is configured to individually control the first and second pluralities of LED subsets.
  15. 15. An LED filament lamp (600), comprising: at least one of at least one LED filament according to any one of claims 1 to 13 and an LED filament arrangement according to claim 14, and At least one of a light transmissive envelope (610) and a light transmissive tube at least partially surrounding the at least one LED filament, and A base (620), wherein the base comprises a connector arranged to mechanically and electrically connect the LED filament lamp to a socket of a luminaire.

Description

LED filament comprising a filament portion Technical Field The present invention relates generally to light emitting diode, LED, filaments. More particularly, the present invention relates to an LED filament comprising a filament portion. Background The use of Light Emitting Diodes (LEDs) for illumination purposes continues to be of interest. LEDs offer many advantages over incandescent, fluorescent, neon, etc., such as longer operating life, reduced power consumption, and increased efficiency associated with the ratio between light and heat energy. In particular, LED filament lamps are highly preferred because they are very decorative. Because of the advantageous aspects of using LEDs, there is a rapid increase in interest in replacing conventional light sources with LEDs in many lighting devices. It should be appreciated that such replacement, also known as retrofit, is appreciated and desired by a user desiring to have the appearance of an incandescent bulb. Light source replacement (retrofit) is typically performed by removing conventional light source(s) from a luminaire (e.g., a lamp socket) of the lighting device and attaching the LED, LED device, or LED apparatus(s) into the luminaire. One of these concepts is based on LED filaments placed in the bulb, as the appearance of such a lamp is considered highly decorative. It should be noted, however, that prior art LED filaments or LED filament arrangements may provide LED filament (arrangement) light which may be even further improved with respect to the light distribution characteristics and/or aesthetic characteristics of the LED filament(s) and/or LED lamp mercerization. It is an object of the present invention to provide an LED filament having improved light distribution characteristics as well as being aesthetically attractive and/or providing decorative lighting while providing advantageous properties of the LED in terms of energy efficiency. US 2019/017657 discloses a filament type LED light source including a plurality of LED modules, a coupler and a common connection portion. The LED modules are polygonal prism structures and emit white light having different color temperatures or light of different wavelengths. Each of the LED modules has a bar shape at a respective side surface of the polygonal prism structure, and includes a first connection electrode and a second connection electrode. WO 2023/083715 relates to an LED filament comprising a carrier comprising a first elongated carrier portion with a first LED, a second elongated carrier portion with a second LED, and a third elongated carrier portion with a third LED, the third elongated carrier portion being arranged between the first elongated carrier portion and the second elongated carrier portion, wherein the carrier is folded into a three-sided structure, e.g. triangular, along a first longitudinal fold line separating the first elongated carrier portion and the third elongated carrier portion and along a second longitudinal fold line separating the second elongated carrier portion and the third elongated carrier portion. Disclosure of Invention It is interesting to combine the advantageous properties of LEDs by means of an LED filament which may provide even further improved light distribution properties compared to the examples in the prior art, while being aesthetically attractive and/or providing decorative illumination. This and other objects are achieved by providing an LED filament having the features of the independent claims. Preferred embodiments are defined in the dependent claims. According to the present invention there is provided a light emitting diode, LED, filament configured to emit, in operation, a mercerized LED lamp. The LED filament includes a first LED filament portion. The first LED filament portion includes a first elongated light transmissive carrier including a first major surface and an array of a plurality of first LEDs disposed on the first major surface, wherein the plurality of first LEDs are configured to emit first LED light. The first LED filament portion further comprises a first elongated encapsulant comprising at least one of a first luminescent material configured to at least partially convert first LED light emitted by the plurality of first LEDs into first converted light and a first light scattering material configured to at least partially scatter the first LED light into first scattered light, wherein the first elongated encapsulant at least partially covers the first major surface and at least partially encloses the array of the plurality of first LEDs. The LED filament further comprises a second LED filament portion. The second LED filament portion includes a second elongated light transmissive carrier including a second major surface and an array of a plurality of second LEDs disposed on the second major surface, wherein the plurality of second LEDs are configured to emit second LED light. The second LED filament portion further comprises a