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Electromagnetic-wave-absorbing composite sheet

An electromagnetic wave and composite board technology, which is applied in the direction of electrical components, magnetic field/electric field shielding, coating, etc., can solve the problem of frequency range conversion without electromagnetic wave absorption ability

Active Publication Date: 2019-12-31
加川清二 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This electromagnetic wave absorbing composite panel has a high absorbing ability for electromagnetic wave noise in a wide frequency range, but it does not have a function to exhibit a particularly large absorbing ability for electromagnetic wave noise in a specific frequency range, and there is no frequency range conversion that maximizes the electromagnetic wave absorbing ability. function of

Method used

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  • Electromagnetic-wave-absorbing composite sheet

Examples

Experimental program
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Effect test

reference example 1

[0164] Use as Figure 5 The device of the structure shown includes pattern rollers 232a, 232b with electroplated fine diamond particles with a particle size distribution of 50μm-80μm, formed in an aluminum film with a thickness of 0.05μm at a crossing angle θs of 90° in two directions A linear scratch on the upper orientation, the aluminum thin film was formed on the surface of a 16 μm biaxially oriented polyethylene terephthalate (PET) film by a vacuum vapor deposition method. The optical micrograph of the linear scratched aluminum film shows that the linear scratch has the following characteristics:

[0165] The range of width W: 0.5μm-5μm,

[0166] Average width Wav: 2μm,

[0167] Range of interval I: 2μm-30μm,

[0168] Average interval Iav: 20μm,

[0169] Average length Lsav: 5mm, and

[0170] Crossing angle θs: 90°.

reference example 2

[0172] Using the device of the structure shown in Figure 3, the device includes pattern rollers 202a, 202b with electroplated fine diamond particles with a particle size distribution of 50μm-80μm, formed in an aluminum film with a thickness of 0.05μm at a crossing angle θs of 60° With linear scratches oriented in two directions, the aluminum thin film was formed on the surface of a PET film with a thickness of 16 μm by a vacuum vapor deposition method. The optical micrograph of the linear scratched aluminum film shows that the linear scratch has the following characteristics:

[0173] The range of width W: 0.5μm-5μm,

[0174] Average width Wav: 2μm,

[0175] Range of interval I: 2μm-30μm,

[0176] Average interval Iav: 20μm,

[0177] Average length Lsav: 5mm, and

[0178] Crossing angle θs: 60°.

reference example 3

[0180] By the same method as Reference Example 2, an aluminum thin film with a thickness of 0.05 μm formed on the surface of a PET film with a thickness of 16 μm by a vacuum vapor deposition method was provided with a 45° crossing angle θs oriented in two directions Linear scratch, the difference is that the crossing angle θs is changed to 45° to prepare an electromagnetic wave absorption film.

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Abstract

An electromagnetic-wave-absorbing composite sheet comprising an electromagnetic-wave-shielding film laminated on an electromagnetic-wave-absorbing film; the electromagnetic-wave-absorbing film comprising a single- or multi-layer thin metal film formed on a surface of a plastic film, the thin metal film being provided with large numbers (pluralities) of substantially parallel, intermittent, linearscratches with irregular widths and intervals in plural directions; the electromagnetic-wave-shielding film being a conductive metal foil, a plastic film having a thin conductive metal film or coating, or a carbon sheet; and an area ratio of the electromagnetic-wave-shielding film to the electromagnetic-wave-absorbing film being 10-80%.

Description

Technical field [0001] The invention relates to an electromagnetic wave absorbing composite board, which has high absorbing ability for electromagnetic wave noise in a desired frequency range, and can transform the frequency range that maximizes the electromagnetic wave noise absorbing ability. Background technique [0002] Electric appliances and electronic appliances emit electromagnetic wave noise, and environmental electromagnetic wave noise invades them to make the signal contain noise. In order to prevent the emission and intrusion of electromagnetic noise, electrical appliances and electronic appliances are usually shielded with metal plates. It has also been proposed to install electromagnetic wave absorption films in electrical appliances and electronic appliances to absorb electromagnetic wave noise. [0003] For example, WO 2010 / 093027 A1 discloses a metal film-plastic composite film with linear scratches with reduced anisotropy in electromagnetic wave absorption capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/08H05K9/00
CPCB32B15/08B32B2255/06B32B2255/10B32B2255/20B32B2307/212H05K9/0086H05K9/0088H05K9/0084H05K9/0062H05K9/0069
Inventor 加川清二
Owner 加川清二
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