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Electromagnetic wave shielding film

A shielding film, electromagnetic wave technology, applied in the fields of magnetic field/electric field shielding, circuit devices, electrical components, etc., can solve the problem of low yield and achieve the effect of preventing discoloration

Active Publication Date: 2018-03-13
TATSUTA ELECTRICWIRE & CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a problem of low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0098] Silica particles with an average particle diameter of 7 μm were used as the particles for forming unevenness added to the insulating layer, and the amount used was 40 parts by mass. The Sa of the insulating layer surface of the obtained electromagnetic wave shielding film was 1.02 μm, the Sdq was 1.26, and the Ssk was 2.22. The 60° glossiness before the artificial pollution liquid was attached was 1.1, and the 60° glossiness after fingerprint wiping was 5.2. The 85° glossiness before the artificial pollution liquid was attached was 1.5, the 85° glossiness after fingerprint wiping was 1.9, and the 85° glossiness difference was 0.4. The L* value was 21.3.

Embodiment 2）

[0100] Except that the usage-amount of the particle for uneven|corrugated formation was 50 mass parts, it carried out similarly to Example 1, and obtained the electromagnetic wave shielding film. Sa of the insulating layer surface of the obtained electromagnetic wave shielding film was 1.18 μm, Sdq was 1.26, and Ssk was 2.21. The 60° glossiness before the artificial pollution liquid was attached was 0.5, and the 60° glossiness after fingerprint wiping was 6.7. The 85° glossiness before the artificial pollution liquid was attached was 1.8, the 85° glossiness after fingerprint wiping was 2.4, and the 85° glossiness difference was 0.6. The L* value was 20.1.

Embodiment 3）

[0102] Except that the usage-amount of the particle for uneven|corrugated formation was 35 mass parts, it carried out similarly to Example 1, and obtained the electromagnetic wave shielding film. Sa of the insulating layer surface of the obtained electromagnetic wave shielding film was 1.31 μm, Sdq was 0.95, and Ssk was 1.47. The 60° glossiness before the artificial pollution liquid was attached was 0.5, and the 60° glossiness after fingerprint wiping was 1.8. The 85° glossiness before the artificial pollution liquid is attached is 1.7, the 85° glossiness after fingerprint wiping is 2.5, and the 85° glossiness difference is 0.8. The L* value was 20.1.

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Abstract

The present invention provides an electromagnetic wave shielding film that is not easily discolored by being wiped by a fingerprint. The electromagnetic wave shielding film includes an insulating layer (110) and a conductive layer (120), wherein the three-dimensional arithmetic average surface roughness Sa of the surface of the insulating layer (110) is 0.8 mum or more.

Description

technical field [0001] The invention relates to an electromagnetic wave shielding film. Background technique [0002] In recent years, smartphones, tablet-type information terminals, etc. have increasingly high performance requirements for high-speed transmission of large-capacity data. High-frequency signals are required to transmit large volumes of data at high speed. However, if high-frequency signals are used, the signal circuit on the printed wiring board will generate electromagnetic wave noise, which will cause errors in the operation of surrounding machines. In order to prevent operation errors, it is necessary to shield the printed wiring board from electromagnetic waves. [0003] In order to shield printed wiring boards, there is a known method of applying heat and pressure to an electromagnetic wave shielding film including an insulating layer and a shielding layer to a printed wiring board to obtain a shielded printed wiring board. (For example, Patent Documen...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0081Y02A30/00H05K1/0216B32B3/30
Inventor 石冈宗悟柳善治
Owner TATSUTA ELECTRICWIRE & CABLE
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