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

Patent metadata

Field	Value
Publication number	US-9504194-B2
Application number	US-201514952812-A
Country	US
Kind code	B2
Filing date	Nov 25, 2015
Priority date	Dec 21, 2011
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

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.

First claim

The invention claimed is:

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 μm 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.

Assignees

• Amosense Co Ltd

Inventors

• Lee Dong Hoon
• Jang Kil Jae

Classifications

• H02J7/70

  characterised by the mechanical construction · CPC title

• H02J50/12

  of the resonant type · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• H05K9/0088

  comprising a plurality of shielding layers; combining different shielding material structure · CPC title