US 12,112,883 B2
Magnetic shielding sheet for wireless power reception module, and wireless power reception module including the same
Kil Jae Jang, Cheonan-si (KR); Dong Hoon Lee, Cheonan-si (KR); and Chol Han Kim, Cheonan-si (KR)
Assigned to AMOSENSE CO., LTD, Cheonan-si (KR)
Appl. No. 18/040,797
Filed by AMOSENSE CO., LTD, Cheonan-si (KR)
PCT Filed Jul. 14, 2021, PCT No. PCT/KR2021/009023
§ 371(c)(1), (2) Date Feb. 6, 2023,
PCT Pub. No. WO2022/030793, PCT Pub. Date Feb. 10, 2022.
Claims priority of application No. 10-2020-0098706 (KR), filed on Aug. 6, 2020.
Prior Publication US 2024/0029947 A1, Jan. 25, 2024
Int. Cl. H01F 27/36 (2006.01); H01F 38/14 (2006.01); H01Q 1/52 (2006.01); H02J 50/10 (2016.01); H02J 50/70 (2016.01)
CPC H01F 27/36 (2013.01) [H01F 38/14 (2013.01); H01Q 1/526 (2013.01); H02J 50/10 (2016.02); H02J 50/70 (2016.02)] 12 Claims
OG exemplary drawing
 
1. A magnetic shielding sheet for a wireless power reception module, which is applied to a wireless power reception module capable of a wireless power share (WPS) function for charging a battery of an electronic device that employs a permanent magnet and has an overall thickness of 150 μm or less, the magnetic shielding sheet comprising:
a first sheet made of a magnetic material to shield a magnetic field; and
a second sheet laminated as a monolayer on one surface of the first sheet by means of a bonding adhesive layer,
wherein the first sheet is provided with a thickness of 60 to 120 μm, which is 2 to 6.7 times thicker than a thickness of the second sheet so as to serve as a main shielding sheet that shields a magnetic field, and
wherein the second sheet is provided with a thickness of 18 to 30 μm, which is thinner than a thickness of the first sheet while having a saturation magnetic flux density of 1 tesla (T) to 2 T, which is twice or more than a saturation magnetic flux density of the first sheet of 0.2 to 0.5 T, so as to prevent magnetic saturation by the permanent magnet when the WPS function is performed, and supplement the shielding performance of the first sheet to increase the charging efficiency of the electronic device such that the total thickness of the magnetic field shielding sheet can be 150 μm or less.