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Electromagnetic shielding sheet and method for manufacturing same

An electromagnetic wave and sheet technology, which is applied in the fields of magnetic/electric field shielding, chemical instruments and methods, electrical components, etc., can solve the problems of reduced blackness of electromagnetic wave shielding sheets, insufficient visibility of display images, and poor electromagnetic wave shielding performance, etc., to achieve Emphasis on the effect of excellent effect, excellent light absorption, and high durability

Inactive Publication Date: 2005-09-28
DAI NIPPON PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that the surface resistance of the conductive layer becomes too high when the film thickness (several 100 Å to 2,000 Å) on which the metal or metal oxide is vapor-deposited is thick enough to achieve transparency. Large, electromagnetic wave shielding becomes poor
However, either method has the disadvantage that the blackness of the metal grid frame (line part) of the electromagnetic wave shielding sheet is reduced, and the visibility of the display image is insufficient.

Method used

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  • Electromagnetic shielding sheet and method for manufacturing same
  • Electromagnetic shielding sheet and method for manufacturing same
  • Electromagnetic shielding sheet and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133]As a conductive material layer containing a metal layer, an electrolytic copper foil for forming the metal layer 21 is prepared, and copper-cobalt alloy particles (average particle diameter: 0.3 μm) are subjected to cathodic electrodeposition on both surfaces to form blackened layers 23A, 23B. , and then carry out chromate treatment on its surface to make a blackened strengthening layer. The thickness of the metal layer is 10 μm, and the surface of the copper-cobalt alloy particles and chromate treatment is implemented, and a biaxially stretched polyethylene terephthalate (PET) film A4300 (manufactured by Toyobo Co., Ltd., trade name) with a thickness of 100 μm is ), laminated with a two-component curing polyurethane adhesive, and then aged at 56°C for 3 days. As the adhesive, the main agent TAKERAKKU A-310 (polyalcohol) composed of polyalcohol and the curing agent A-10 composed of polyisocyanate (both manufactured by Takeda Pharmaceutical Co., Ltd., trade name) are used...

Embodiment 2

[0146] A flat layer composition of the following composition was applied to the mesh of Example 1, and SP-PET20-BU (manufactured by Tosero Corporation, trade name of PET film with surface release treatment) was laminated to a thickness of 50 μm. cm 2 Exposure (converted to 365nm). And when SP-PET20-BU was peeled, the sheet|seat for electromagnetic wave shields of Example 2 in which the mesh part was flattened was obtained. This electromagnetic wave shielding sheet had the same performance as that of Example 1.

[0147] The flat layer composition used: 20 parts by mass of N-vinyl-2-pyrrolidone, 25 parts by mass of dicyclopentenyl acrylate, 52 parts by mass of oligoester acrylate (manufactured by Toagosei Co., Ltd., M-8060), 3 parts by mass of 1-hydroxycyclohexyl phenyl ketone (manufactured by ciba-Geigy, IRUGACURE 184).

Embodiment 3

[0149] A sheet for electromagnetic shielding was obtained in the same manner as in Example 2 except that 1 part by mass of a nickel thiol complex was contained as an NRI absorber in the flat layer composition of Example 2. This electromagnetic wave shielding sheet had the same performance as that of Example 1, and the visibility of the display image was better.

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Abstract

Copper-cobalt alloy particles are stuck to the surfaces of a metal layer (21) to form blackened layers (23A, 23B). Blackness enhancing layers (25A, 25B) are formed by a chromate treatment, covering the copper-cobalt alloy particles (23A, 23B). The blackness enhancing layers (25A, 25B) and a base (11) are put together. A conductive material layer (109) composed of the metal layer (21), the blackened layers (23A, 23B), and the blackness enhancing layers (25A, 25B) is formed into a mesh by photolithography, thereby obtaining an electromagnetic shielding sheet (1).

Description

technical field [0001] The present invention relates to a sheet for electromagnetic wave shielding (also referred to as shielding) and a manufacturing method thereof. More specifically, it relates to a sheet arranged in front of displays such as CRTs and PDPs to shield electromagnetic waves emitted by the display. Distinguishing the image displayed on the monitor, an electromagnetic wave shielding sheet using a metal foil (film) net, and a manufacturing method thereof. Background technique [0002] (Technical Overview) In recent years, with the high performance and wide application of electrical and electronic instruments, electromagnetic noise interference (Electro Magnetic Interference; EMI) is increasing. Electromagnetic noise is broadly classified into conducted noise and radiated noise. The way to prevent conducted noise is to use a noise filter, etc. On the other hand, there are methods for preventing radiated noise such as making the case metal for electromagnetic i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCY10T442/11Y10T442/112Y10T442/109H05K9/0096Y10T428/25Y10T428/256G09F9/00H05K9/00
Inventor 小岛弘
Owner DAI NIPPON PRINTING CO LTD
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