Glass for shielding 2.45GHz electromagnetic wave and preparation method thereof

An electromagnetic wave and glass technology, which is applied in the field of glass shielding 2.45GHz electromagnetic wave and its preparation, can solve the problems of large volume, easy disconnection of grid points, and affecting product life.

Inactive Publication Date: 2008-09-17
杭州钱塘江特种玻璃技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the wire mesh structure has sufficient shielding effectiveness, it has problems such as large volume, heavy weight, poor transparency, and diffraction gratings. The metal itself is also prone to oxidation, and high-frequency contact at the grid points is easy to occur after long-term use. Disconnection and other problems that seriously affect the life of the product
In addition, metal oxide conductive films (such as: indium tin oxide ITO, etc.) are also used as transparent electromagnetic shielding materials. Although their light transmittance is good, their shielding effectiveness for electromagnetic waves in high-frequency bands above 30MHz is low.

Method used

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  • Glass for shielding 2.45GHz electromagnetic wave and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Use 3mm white glass as the coating substrate, first soak and clean it with a special glass cleaning solution, then place it in an acetone solution for ultrasonic vibration cleaning, then rinse it with deionized water, and finally dry it with clean hot air, put it into the electron beam evaporation studio, at 10 -5 Under Pa background vacuum, Ar gas was introduced, and the substrate surface was cleaned again by ion bombardment. The ion bombardment voltage was 1.4kV, the bombardment current was 90mA, and the bombardment time was 10min.

[0020] 2) Heating the substrate temperature to 100°C, evaporating a zinc sulfide film on the substrate by electron beam evaporation, and controlling the vacuum degree of the working room to 1.6×10 -3 Pa, beam current 10mA, deposition rate 9 Å / s:

[0021] 3) Turn off the heating device in the working room, and after cooling to room temperature, use electron beam evaporation to evaporate the metal silver film, and control the vacuum deg...

Embodiment 2

[0025] 1) Use 3mm white glass as the coating substrate, first soak and clean it with a special glass cleaning solution, then place it in an acetone solution for ultrasonic vibration cleaning, then rinse it with deionized water, and finally dry it with clean hot air, put it into the electron beam evaporation studio, at 10 -5 Under Pa background vacuum, Ar gas was introduced, and the substrate surface was cleaned again by ion bombardment. The ion bombardment voltage was 2.5kV, the bombardment current was 180mA, and the bombardment time was 16min.

[0026] 2) Heating the substrate temperature to 100°C, evaporating a zinc sulfide film on the substrate by electron beam evaporation, and controlling the vacuum degree of the working room to 2.5×10 -3 Pa, beam current 40mA, deposition rate 9 angstroms / second;

[0027] 3) Turn off the heating device in the working room, and after cooling to room temperature, use electron beam evaporation to evaporate and deposit metallic silver film, a...

Embodiment 3

[0031] 1) Use 3mm white glass as the coating substrate, first soak and clean it with a special glass cleaning solution, then place it in an acetone solution for ultrasonic vibration cleaning, then rinse it with deionized water, and finally dry it with clean hot air, put it into the electron beam evaporation studio, at 10 -5 Under Pa background vacuum, Ar gas was introduced, and the substrate surface was cleaned again by ion bombardment. The ion bombardment voltage was 2.0kV, the bombardment current was 120mA, and the bombardment time was 13min.

[0032] 2) Heating the substrate temperature to 100°C, evaporating a zinc sulfide film on the substrate by electron beam evaporation, and controlling the vacuum degree of the working room to 2.0×10 -3 Pa, beam current 20mA, deposition rate 6 angstroms / second;

[0033] 3) Turn off the heating device in the working room, and after cooling to room temperature, use electron beam evaporation to evaporate the metal silver film, and control ...

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Abstract

The invention discloses glass for shielding 2.45GHz electromagnetic waves, which comprises a white glass substrate on which, from the bottom to the top, a first zinc sulfide coating, a metal silver coating and a second zinc sulfide coating are deposited in sequence. The glass is produced by electron-beam evaporation and in-situ multi-layer deposition techniques. The inventive glass can reduce radiation of 2.45GHz electromagnetic waves by more than 30dB and also has a visible light transmissivity more than 70%. The glass has light weight and simple structure and is better in comprehensive performance than the common wire mesh-laminated glass. The glass is widely used for 2.45GHz band with high utilization rate, more particularly the field of transparent view windows of the band, such as doors of microwave ovens in household electric appliances.

Description

technical field [0001] The invention relates to a glass shielding electromagnetic waves and a preparation method thereof, in particular to glass shielding 2.45GHz electromagnetic waves and a preparation method thereof. Background technique [0002] With the popularization and application of many electrical equipment in modern society, the harm of electromagnetic wave radiation to the human body and the interference to nearby electronic instruments have attracted increasing attention. In the ISM (industrial, scientific and medical) frequency band of the electromagnetic spectrum, 2.45GHz is a special frequency band that is free and open to the public without a license on a global scale, so it is one of the most frequently used electromagnetic frequency bands, and it is also the most busy frequency band. Since common household appliances such as microwave ovens, cordless phones, car door openers, and Bluetooth technology are all used in this frequency band, unpredictable elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/36
Inventor 平柏战张溪文金朝良刘化文
Owner 杭州钱塘江特种玻璃技术有限公司
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