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