# US 12,112,883 B2 · Magnetic shielding sheet for wireless power reception module, and wireless power reception module including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,112,883 B2 - Document ID: US12112883B2 - Status: Granted - Kind: B2 - Application number: 18/040,797 - Filed: 2021-07-14 - Published: 2024-01-25 - Granted: 2024-10-08 - Earliest claimed: 2020-08-06 - Assignees: Amosense Co., Ltd. - Applicants: Amosense Co., Ltd - Inventors: Kil Jae Jang; Dong Hoon Lee; Chol Han Kim - Web page: https://patentgrep.com/patent/US12112883B2 ## CPC - H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10) - H01F 27/366: {made of ferromagnetic material} - H01F 38/14: Inductive couplings - H01Q 1/526: {Electromagnetic shields} - H02J 50/00: Circuit arrangements or systems for wireless supply or distribution of electric power - H02J 50/10: using inductive coupling - H02J 50/12: of the resonant type - H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields - H05K 9/00: Screening of apparatus or components against electric or magnetic fields (devices for absorbing radiation from an antenna H01Q17/00) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract A magnetic shielding sheet for a wireless power reception module is provided. A magnetic shielding sheet for a wireless power reception module according to an exemplary embodiment of the present invention, which is applied to a wireless power reception module capable of a wireless power share (WPS) function and has an overall thickness of 150 μm or less. The magnetic shielding sheet includes 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 second sheet is provided to have a smaller thickness than a thickness of the first sheet while having a saturation magnetic flux density twice or more than a saturation magnetic flux density of the first sheet. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The magnetic shielding sheet of claim 1, wherein a permeability of the first sheet is 0.05 to 12 times a permeability of the second sheet. ### Claim 3 (depends on 2) The magnetic shielding sheet of claim 2, wherein the permeability of the first sheet is 300 to 3600, and the permeability of the second sheet is 300 to 6000. ### Claim 4 (depends on 1) The magnetic shielding sheet of claim 1, wherein the first sheet is a ferrite sheet, and the second sheet is a ribbon sheet of an amorphous alloy or a nanocrystalline alloy. ### Claim 5 (depends on 1) The magnetic shielding sheet of claim 1, wherein each of the first sheet and the second sheet is a sheet formed by being divided into a plurality of pieces. ### Claim 6 (depends on 1) The magnetic shielding sheet of claim 1, comprising an attachment adhesive lave disposed on one surface of the first sheet, wherein a wireless power reception antenna is attached to the one surface of the first sheet by means of the attachment adhesive layer. ### Claim 7 A wireless power reception module comprising: a wireless power reception antenna capable of a wireless power share (WPS) function for charging a battery of an electronic device that employs a permanent magnet; and a magnetic shielding sheet disposed one surface of the wireless power reception antenna, wherein the magnetic shielding sheet is the magnetic shielding sheet, wherein the magnetic shielding sheet has an overall thickness of 150 μm or less, wherein the magnetic shielding sheet comprises: 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 2T, 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. ### Claim 8 (depends on 7) The wireless power reception module of claim 7, wherein a permeability of the first sheet is 0.05 to 12 times a permeability of the second sheet. ### Claim 9 (depends on 8) The wireless power reception module of claim 8, wherein the permeability of the first sheet is 300 to 3600, and the permeability of the second sheet is 300 to 6000. ### Claim 10 (depends on 7) The wireless power reception module of claim 7, wherein the first sheet is a ferrite sheet, and the second sheet is a ribbon sheet of an amorphous alloy or a nanocrystalline alloy. ### Claim 11 (depends on 7) The wireless power reception module of claim 7, wherein each of the first sheet and the second sheet is a sheet formed by being divided into a plurality of pieces. ### Claim 12 (depends on 7) The wireless power reception module of claim 7, comprising an attachment adhesive layer disposed on one surface of the first sheet, wherein the wireless power reception antenna is attached to the one surface of the first sheet by means of the attachment adhesive layer.