US 12,142,949 B2
Shielding film, coil assembly, and wireless charging device
Yuechao Li, Dongguan (CN); and Chao Yang, Dongguan (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed on Sep. 30, 2021, as Appl. No. 17/490,150.
Application 17/490,150 is a continuation of application No. PCT/CN2020/109649, filed on Aug. 17, 2020.
Claims priority of application No. 202010128231.6 (CN), filed on Feb. 28, 2020.
Prior Publication US 2022/0021246 A1, Jan. 20, 2022
Int. Cl. H01F 27/28 (2006.01); H01F 27/36 (2006.01); H01F 38/14 (2006.01); H02J 50/00 (2016.01); H02J 50/10 (2016.01); H02J 50/70 (2016.01)
CPC H02J 50/70 (2016.02) [H01F 27/2885 (2013.01); H01F 27/36 (2013.01); H01F 27/363 (2020.08); H01F 38/14 (2013.01); H02J 50/005 (2020.01); H02J 50/10 (2016.02)] 11 Claims
OG exemplary drawing
 
1. A shielding film comprising a first film layer, wherein
the first film layer comprises a first conductive part and a first insulating part, and the first insulating part penetrates the first conductive part or the first conductive part penetrates the first insulating part in a thickness direction of the first film layer;
under the influence of a magnetic field of a first electromagnetic field, a first eddy current is formed in the first film layer, and a loop of the first eddy current is located in the first conductive part; and under the influence of a magnetic field of a second electromagnetic field, a second eddy current is formed in the first film layer, and a loop of the second eddy current passes through the first insulating part; and
a loop area of the first eddy current is less than a loop area of the second eddy current,
wherein the first insulating part constitutes a main part of the first film layer, a plurality of first conductive parts are disposed in the first film layer, and the plurality of first conductive parts penetrate the first insulating part in the thickness direction of the first film layer.