Method for preparing magnetic shielding sheet for wireless charging and NFC

Abstract

The invention discloses a method for preparing a magnetic shielding sheet for wireless charging and NFC. The method comprises steps that a magnetic material required for preparing the magnetic shielding sheet is provided, the magnetic material is subjected to winding processing, thermal processing, single-sided glue coating, fitting and shredding, secondary fitting and shredding, and the like tillthe magnetic performance reaches requirements, and lastly, edge forming processing is performed. The method is advantaged in that the stability and magnetic permeability of the nanocrystal can be maximized through the winding length and heat treatment process parameters, a new bonding mode can be adopted to reduce the risk of the magnetic material being stripped off by a release film in the filmstripping process, through the shredding method, that each layer of the magnetic material can be shredded to the maximum degree in a roll-to-roll mode is guaranteed, shredded particles are uniform, the surface of the magnetic sheet is smooth and flat, the appearance yield and the performance yield are high, compared with a conventional shredding method, not only various auxiliary materials required for shredding are saved, manufacturing cost of the magnetic sheet is reduced, and production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of wireless charging and near-field communication, in particular to a method for preparing a magnetic shielding sheet used for wireless charging and NFC. Background technique [0002] Near field communication technology (NFC) is evolved from the integration of non-contact radio frequency identification (RFID) and interconnection technologies. It combines inductive card readers, inductive cards and point-to-point functions on a single chip. Identification and data exchange with compatible devices. The NFC antenna is a component used to transmit or receive electromagnetic waves in wireless charging. It converts the guided wave propagating on the transmission line into an electromagnetic wave propagating in a medium (usually free space), or vice versa. Engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasures, remote sensing, and radio astronomy, w...

AI Technical Summary

Problems solved by technology

The effect of the existing crushing equipment is not ideal. The surface of the crushed magnetic sheet is rough, the particles are uneven, and some debris will fall off.

The above problems will lead to high permeability loss of the magnetic sheet, large eddy current effect generated by the magnetic sheet, and serious magnetic flux leakage.

When applied to wireless charging and NFC, it will lead to low charging efficiency, poor magnetic isolation effect, and obvious heating of the battery during charging.

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