Magnetic field shielding sheet for a wireless charger, method for manufacturing same, and receiving apparatus for a wireless charger using the sheet

• US 9,504,194 B2
• Filed: 11/25/2015
• Issued: 11/22/2016
• Est. Priority Date: 12/21/2011
• Status: Active Grant

• Current Assignee: Amosense Co., Ltd.
• Original Assignee: Amosense Co., Ltd.
• Inventors: Lee, Dong Hoon, Jang, Kil Jae
• Primary Examiner(s): TSO, EDWARD H
• Application Number:
  US14/952,812
• Publication Number:
  US 20160081237A1
• Time in Patent Office: 363 Days
• Field of Search: 320/107, 320/108, 320/114, 320/115, 336/84.R, 336/84.C, 307/9.1, 307/104
• US Class Current: 1/1
• CPC Class Codes: B32B 37/12 characterised by using adhesives
• CPC Class Codes: B32B 37/18 involving the assembly of discrete sheets or panels only
• CPC Class Codes: B32B 38/0004 Cutting, tearing or severing, e.g. bursting; Cutter details cutting in general B26D; laminating combined with punching or perforating B32B38/04; removing all or part of the layers B32B38/10; cutting in combination with laying up and registration B32B38/185 takes precedence
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence
• CPC Class Codes: H01Q 7/08 Ferrite rod or like elongated core
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: H05K 9/0075 Magnetic shielding materials
• CPC Class Codes: H05K 9/0081 Electromagnetic shielding materials, e.g. EMI, RFI shielding H05K9/0003 takes precedence
• CPC Class Codes: H05K 9/0088 comprising a plurality of shielding layers; combining different shielding material structure
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor
• CPC Class Codes: Y10T 428/249955 Void-containing component partially impregnated with adjacent component
• CPC Class Codes: Y10T 428/249956 Void-containing component is inorganic
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/2848 : Three or more layers
• CPC Class Codes: Y10T 428/32 : Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer

Abstract

Provided are a magnetic field shield sheet for a wireless charger, a method of manufacturing the sheet, and a receiver for the wireless charger by using the sheet. The sheet includes at least one layer thin magnetic sheet made of an amorphous ribbon separated into a plurality of fine pieces; a protective film that is adhered on one surface of the thin magnetic sheet via a first adhesive layer provided on one side of the protective film; and a double-sided tape that is adhered on the other surface of the thin magnetic sheet via a second adhesive layer provided on one side of the double-sided adhesive tape, wherein gaps among the plurality of fine pieces are filled by some parts of the first and second adhesive layers, to thereby isolate the plurality of fine pieces.

Claims

1. A magnetic field shield sheet for a wireless charger, the magnetic field shield sheet comprising:

a thin magnetic sheet separated into a plurality of fine pieces; and

an adhesive member adhered on one surface of the thin magnetic sheet such that the adhesive member is adhered to the plurality of fine pieces;

wherein the plurality of fine pieces comprises fine pieces having different sizes with each other of several tens of gm to 3 mm.

2. The magnetic field shield sheet for a wireless charger of claim 1, wherein the adhesive member is a double-sided tape, and at least parts of gaps among the plurality of fine pieces are filled by an adhesive layer of the double-sided tape.

3. The magnetic field shield sheet for a wireless charger of claim 1, wherein the adhesive member is a no-base type tape, the thin magnetic sheet is adhered on one surface of the adhesive member, and a release film is separably adhered on the other surface of the adhesive member.

4. The magnetic field shield sheet for a wireless charger of claim 1, further comprising a protective member adhered on the other surface of the thin magnetic sheet.

5. The magnetic field shield sheet for a wireless charger of claim 1, wherein a thin ribbon made of an amorphous alloy or nanocrystalline alloy is used as the thin magnetic sheet.

6. The magnetic field shield sheet for a wireless charger of claim 1, wherein the magnetic field shield sheet is applied to a reception device of a wireless charger having a permanent magnet in a transmission device, and wherein the thin magnetic sheet comprises 2 to 8 layers of laminated sheets made of a Fe-based amorphous alloy, and an adhesive layer is inserted among the laminated sheets.

7. The magnetic field shield sheet for a wireless charger of claim 1, wherein the magnetic field shield sheet is applied to a reception device of a wireless charger having a permanent magnet in a transmission device, and wherein the thin magnetic sheet comprises 4 to 12 layers of laminated sheets made of a nanocrystalline alloy, and an adhesive layer is inserted among the laminated sheets.

8. The magnetic field shield sheet for a wireless charger of claim 1, wherein the magnetic field shield sheet is applied to a reception device of a wireless charger having no permanent magnet in a transmission device, and wherein the thin magnetic sheet comprises 2 to 4 layers of laminated sheets made of a Fe-based amorphous alloy or a nanocrystalline alloy, and an adhesive layer is inserted among the laminated sheets.

9. The magnetic field shield sheet for a wireless charger of claim 1, wherein the magnetic field shield sheet is formed of a shape corresponding to a secondary coil provided on the reception device of the wireless charger.

10. A reception device for a wireless charger that charges a secondary battery from a transmission device for the wireless charger, the reception device comprising:

a coil unit that receives a wireless signal transmitted from the transmission device; and

a magnetic field shield sheet that is disposed between the coil unit and the secondary battery,

wherein the magnetic field shield sheet comprises;

a thin magnetic sheet separated into a plurality of fine pieces; and

an adhesive member adhered on one surface of the thin magnetic sheet such that the adhesive member is adhered to the plurality of fine pieces;

wherein the plurality of fine pieces comprises fine pieces having different sizes with each other of several tens of μ

m to 3 mm.

11. The reception device for a wireless charger of claim 10, wherein the coil unit and an antenna coil for near field communications (NFC) are formed on a single substrate.