US 12,085,238 B2
LED filament
Ties Van Bommel, Horst (NL)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 18/562,939
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed May 17, 2022, PCT No. PCT/EP2022/063260
§ 371(c)(1), (2) Date Nov. 21, 2023,
PCT Pub. No. WO2022/248283, PCT Pub. Date Dec. 1, 2022.
Claims priority of application No. 21176004 (EP), filed on May 26, 2021.
Prior Publication US 2024/0218987 A1, Jul. 4, 2024
Int. Cl. F21K 9/232 (2016.01); F21K 9/68 (2016.01); H01L 25/075 (2006.01); F21Y 113/17 (2016.01); F21Y 115/10 (2016.01)
CPC F21K 9/232 (2016.08) [F21K 9/68 (2016.08); H01L 25/0753 (2013.01); F21Y 2113/17 (2016.08); F21Y 2115/10 (2016.08)] 13 Claims
OG exemplary drawing
 
1. A light emitting diode, LED, filament arranged to emit LED filament light, comprising
an elongated axis, A,
at least one array of a plurality of light emitting diodes, LEDs, arranged to emit LED light,
an encapsulant enclosing the at least one array of the plurality of LEDs, wherein the encapsulant comprises a light-transmissive material,
a carrier arranged to support the plurality of LED's, wherein the encapsulant at least partially encloses the carrier and wherein the carrier is at least one of light transmissive and reflective,
wherein the LED filament further comprises
an elongated reflector having a first reflectivity, R1, arranged to reflect the LED light, wherein the reflector, by partially enclosing a cross-section, CB, perpendicular to the axis, A, of the LED filament in a radial direction, R, partially encloses the encapsulant along the LED filament and is in direct contact with the encapsulant and the carrier, whereby the reflector defines at least one opening along the LED filament, wherein the encapsulant is not covered by the reflector along the at least one opening.