US 11,982,411 B2
Filament based solid state lighting device
Xiaogai Tian, Shanghai (CN); Xiuru Wang, Shanghai (CN); Tungching Wu, Shanghai (CN); Songhui Chen, Shanghai (CN); Yanmeng Sun, Shanghai (CN); and Jiahua Yan, Shanghai (CN)
Assigned to SIGNIFY HOLDINGS B.V., Eindhoven (NL)
Appl. No. 18/270,588
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Dec. 28, 2021, PCT No. PCT/EP2021/087699
§ 371(c)(1), (2) Date Jun. 30, 2023,
PCT Pub. No. WO2022/148689, PCT Pub. Date Jul. 14, 2022.
Claims priority of application No. PCT/CN2021/070522 (WO), filed on Jan. 6, 2021; and application No. 21159304 (EP), filed on Feb. 25, 2021.
Prior Publication US 2024/0068628 A1, Feb. 29, 2024
Int. Cl. F21K 9/232 (2016.01); F21K 9/235 (2016.01); F21K 9/64 (2016.01); F21K 9/90 (2016.01); F21Y 115/10 (2016.01)
CPC F21K 9/232 (2016.08) [F21K 9/235 (2016.08); F21K 9/64 (2016.08); F21K 9/90 (2013.01); F21Y 2115/10 (2016.08)] 15 Claims
OG exemplary drawing
 
1. A lighting device comprising:
a transmissive housing;
a filament within said transmissive housing, said filament comprising a transmissive substrate carrying a plurality of solid state lighting elements; and
a phosphor containing resin coating enveloping said filament, said resin coating including at least one region, with a reduced thickness, leaking light produced by said solid state lighting elements that is unconverted by said phosphor;
wherein the transmissive housing carries a further phosphor layer covering a part of the transmissive housing and being optically aligned with each of said regions of the resin coating with the reduced thickness, each of said further phosphor layers being arranged to receive said unconverted light leaking from at least one of said regions, whilst other part of the housing remains transmissive.