Magnetic field shielding sheet, manufacturing method thereof, wireless power receiving module, and terminal equipment

Abstract

A magnetic field shielding sheet and its manufacturing method, a wireless power receiving module, and a portable terminal device thereof are provided. The magnetic field shielding sheet according to one embodiment of the present invention is arranged on one side of an antenna having a hollow portion having a predetermined area formed in the central portion. The magnetic field shielding sheet includes: a sheet body, which is formed of a multi-layer sheet that includes at least one of heat-treated amorphous alloys and nanocrystalline alloys with a plurality of strip sheets laminated with a first adhesive layer as a medium a plurality of penetrating parts, which are penetratingly formed in a corresponding area corresponding to the hollow part of the antenna, and are formed in a linear shape with a predetermined width and length; and a plurality of slits, which are formed from the edge of the penetrating part to the sheet A body-side extension is formed in the corresponding area.

Description

technical field [0001] The invention relates to a magnetic field shielding sheet and a manufacturing method thereof, a wireless power receiving module and a portable terminal device thereof. Background technique [0002] Near Field Communication (NFC) and wireless charging are essentially contactless transmission methods. This non-contact transmission method is embodied by an antenna that transmits or receives a magnetic field, and a magnetic field shielding sheet that is arranged on one side of the antenna to enable smooth transmission or reception of a magnetic field. [0003] Generally, as a magnetic field shielding sheet, a sheet made of a magnetic material such as an amorphous tape sheet, a ferrite material, or a polymer sheet is used. [0004] On the other hand, the magnetic field shielding sheet uses a sheet formed by separating a plurality of fragments so that loss due to eddy current can be greatly reduced or the flexibility of the sheet itself can be improved. ...

AI Technical Summary

Problems solved by technology

[0009] However, the more the chip-making process is repeated, the smaller the size of the fragments separated from each other is, and the total number of separated chips increases. Therefore, the more the chip-making process is repeated, the more the impedance of the shielding sheet increases, and the shielding sheet can be reduced. The effect caused by small eddy currents, but there is a problem that the magnetic permeability of the shielding sheet is reduced to below 1500

[0010] Therefore, in order to reflect the magnetic field shielding sheet having a high magnetic permeability of more than 2000 while increasing the impedance of the shielding sheet itself, there is a problem that the overall thickness of the magnetic field shielding sheet needs to be increased.

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