Soft-magnetic composite film and manufacturing method and application of soft-magnetic composite film in electronic equipment

Abstract

The present invention provides a soft magnetic composite film for absorbing near-field electromagnetic waves, a soft magnetic composite film adhesive tape, a manufacturing method and the use thereof in electronic devices for absorbing near-field electromagnetic noises. The soft magnetic composite film can solve the problems existing in the prior art that a composite film has a low magnetic conductivity at 2-3 GHz and shows poor absorption effect of near-field electromagnetic noise, but it cannot effectively solve the problem that the signal transmission quality of an electronic device is low. The technical solution is a soft magnetic composite film. The soft magnetic composite film comprises: a, a sheet Fe-Ni soft magnetic alloy powder in which 45%-60% Fe and 40%-55% Ni by mass fraction are comprised; b, sheet Fe-Ni soft magnetic alloy powder and an organic bonding material are mixed and formed into a soft magnetic composite film, wherein the volume fraction of the sheet Fe-Ni soft magnetic alloy powder accounts for 31% to 73% of the total volume of the soft magnetic composite film material. The present invention has a high magnetic conductivity at 1-5 GHz, particularly between 2 and 3GHz, enabling high frequency near-field electromagnetic noise to be absorbed by the magnetic composite film more easily.

Description

technical field [0001] The invention relates to a sheet-shaped soft magnetic alloy composite material, in particular to a sheet-shaped iron-nickel soft magnetic alloy composite film and a method for manufacturing the soft magnetic composite film, and the method for absorbing electromagnetic noise of the film in electronic equipment application. Background technique [0002] With the increasingly higher integration density and higher operating frequency of electronic devices in electronic equipment, more complex electromagnetic wave noise and corresponding electromagnetic compatibility problems are becoming more and more prominent. In the prior art, one of the effective methods to solve these problems is to apply noise absorbing sheets in electronic equipment. [0003] Correspondingly, some patent documents related to magnetic noise absorbing sheets have also been disclosed. The U.S. Navy US2951247 discusses a magnetic noise absorbing sheet mixed with thin soft magnetic all...

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Problems solved by technology

[0010] The invention provides a soft magnetic composite film and its manufacturing method and its application in electronic equipment for absorbing near-field electromagnetic noise, which can solve the problem that the magnetic permeability of the composite film in the prior art is not high enough when it is greater than 1 GHz, especially greater than 2.4 GHz. As a result, the near-field electromagnetic noise absorption effect of the composite film is not good, which leads to the problem of low signal transmission quality of electronic equipment

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