US 12,007,076 B2
Light bulb
Michal Jan Horaczek, Best (NL)
Assigned to SIGNIFY HOLDING, B.V., Eindhoven (NL)
Appl. No. 17/924,225
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed May 25, 2021, PCT No. PCT/EP2021/063773
§ 371(c)(1), (2) Date Nov. 9, 2022,
PCT Pub. No. WO2021/239670, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 20177042 (EP), filed on May 28, 2020.
Prior Publication US 2023/0184393 A1, Jun. 15, 2023
Int. Cl. F21K 9/232 (2016.01); F21K 9/237 (2016.01); F21K 9/90 (2016.01); F21V 23/00 (2015.01); F21Y 115/10 (2016.01)
CPC F21K 9/232 (2016.08) [F21K 9/237 (2016.08); F21K 9/90 (2013.01); F21V 23/002 (2013.01); F21Y 2115/10 (2016.08)] 16 Claims
OG exemplary drawing
 
1. A light bulb comprising:
a light engine arranged within a space enclosed by a light transmissive surface structure and a glass stem;
the glass stem comprising a mutually connected flare and tubular portion, the stem supporting the light engine and is fused by its flare to the light transmissive surface structure;
a feedthrough body extending through the glass stem and being fixed by fusion in said tubular portion,
wherein the feedthrough body is provided with a plurality of electrical conductors electrically isolated from each other which extend through the glass stem and connect said light engine to at least one power and signal source,
wherein said feedthrough body is made of a ceramic, or a glass, and wherein the glass stem has a first melting point Tm1 and the feedthrough body has a second melting point Tm2, wherein Tm2-Tm1>=75° C.