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

• US 10,010,018 B2
• Filed: 11/25/2015
• Issued: 06/26/2018
• 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
• Application Number:
  US14/952,711
• Publication Number:
  US 20160081239A1
• Time in Patent Office: 944 Days
• Field of Search: 320107, 320108, 320114, 336 84 R, 336 84 C, 307 91
• 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 hybrid-type magnetic field shield sheet for a portable terminal employing both a near field communications (NFC) function and a wireless charging function, the hybrid-type magnetic field shield sheet comprising:

an amorphous sheet disposed at a central portion of the hybrid-type magnetic field shield sheet; and

an annular ferrite loop that surrounds the amorphous sheet on the outside of the amorphous sheet,

wherein a permeability of the ferrite loop is lower than a permeability of the amorphous sheet.

2. The hybrid-type magnetic field shield sheet of claim 1, wherein the amorphous sheet is separated into a plurality of fine pieces.

3. The hybrid-type magnetic field shield sheet of claim 1, wherein the ferrite loop is used for a magnetic field shield for the NFC and the amorphous sheet is used for a magnetic field shield for the wireless charging.

4. The hybrid-type magnetic field shield sheet of claim 1, wherein an amorphous ribbon made of Fe-based amorphous alloy or Co-based amorphous alloy is used for the amorphous sheet.

5. An antenna device for a portable terminal employing both a near field communications (NFC) function and a wireless charging function, the antenna device comprising:

a hybrid-type magnetic field shield sheet comprising an amorphous sheet disposed at a central portion of the hybrid-type magnetic field shield sheet, and an annular ferrite loop that surrounds the amorphous sheet on the outside of the amorphous sheet; and

an antenna adhered to one surface of the hybrid-type magnetic field shield sheet for providing the NFC function and the wireless charging function for the portable terminal,

wherein the ferrite loop is used for a magnetic field shield for the NFC and the amorphous sheet is used for a magnetic field shield for the wireless charging.

6. The antenna device for a portable terminal of claim 5, wherein the amorphous sheet is separated into a plurality of fine pieces.

7. The antenna device for a portable terminal of claim 5, wherein a permeability of the ferrite loop is lower than a permeability of the amorphous sheet.

8. The antenna device for a portable terminal of claim 5, wherein the antenna comprises a substrate, and an antenna coil formed on the substrate with a conductive pattern.

9. The antenna device for a portable terminal of claim 8, wherein the substrate is a double-sided tape, and the antenna coil is formed on the double-sided tape by using a transfer method.

10. The antenna device for a portable terminal of claim 9, wherein a protective film made of photo solder resist (PSR) is formed on a surface, on which the antenna coil is formed, of the double-sided tape.