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Mask for preventing magnetic card from being demagnetized

A shielding device and degaussing technology, applied in the direction of magnetic field/electric field shielding, electrical components, etc., can solve the problems of heavy weight, inconvenient carrying, and high cost of the shielding box, and achieve the effects of good conductivity, shielding the magnetic field of mobile phones, and large reflection attenuation

Inactive Publication Date: 2007-11-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the existing magnetic storage materials placed together with mobile phones, the high-power electromagnetic field pulse generated by the mobile phone will cause the loss of information stored in the magnetic card, which brings great inconvenience to people's lives; in addition, due to the weight of the shielding box Larger, inconvenient to carry, single style, and higher cost, it will bring a lot of inconvenience to users; when people want to achieve the purpose of anti-degaussing, they need to replace the original wallet with this shielding box, resulting in the loss of existing resources. In order to solve the problem of waste, a shielding device for preventing magnetic card degaussing is provided. The specific technical solution to solve the above problems is as follows:

Method used

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  • Mask for preventing magnetic card from being demagnetized
  • Mask for preventing magnetic card from being demagnetized
  • Mask for preventing magnetic card from being demagnetized

Examples

Experimental program
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specific Embodiment approach 1

[0008] Specific Embodiment 1: This embodiment will be described with reference to FIG. 1 , FIG. 3 , and FIG. 4 . This embodiment consists of a first metal sheet 1, a flexible foam plastic layer 2 and a second metal sheet 3, the flexible foam plastic layer 2 is arranged between the first metal sheet 1 and the second metal sheet 3, the first metal sheet 1 and the second metal sheet 3 The second metal sheet 3 is made of copper material. The first metal sheet 1 and the second metal sheet 3 are evenly pierced with several holes 4. The holes 4 of the first metal sheet 1 and the second metal sheet 3 are arranged in a staggered manner. The surrounding edges of the sheet 1 and the second metal sheet 3 are welded and composited.

specific Embodiment approach 2

[0009] Embodiment 2: The holes 4 on the first metal sheet 1 and the second metal sheet 3 in this embodiment are square holes, and the side length of the square holes is 1.2mm-2mm.

specific Embodiment approach 3

[0010] Embodiment 3: The distance between adjacent square holes 4 in this embodiment is 0.6-2mm.

[0011] The determination of the side lengths of the square holes 4 of the first metal sheet 1 and the second metal sheet 3 of the device and the distance between the square holes 4 should meet the principle that the electromagnetic wave energy attenuation value SE reaches or exceeds 40dB.

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Abstract

The invention is used for solving the issue that is that the high power electromagnetic field produced by mobile phone can caused the loss of information saved in the magnetic card when the mobile phone and magnetic cared are placed together. The manufacturing method comprises: setting up a foamed plastic layer between a first metal plate and a second metal plate; opening holes on the first metal plate and second metal plate; the holes on the first metal plate and second metal plate are in interleaved arrangement; the four edges of the first metal plate are connected to the four edges of the second metal plate.

Description

technical field [0001] The invention relates to an electromagnetic shielding appliance, in particular to a shielding device capable of attenuating the degaussing effect of mobile phone electromagnetic radiation on a magnetic card. Background technique [0002] At present, most magnetic cards store information by attaching a strip of magnetic material to a plastic card, and the magnetic strip will fail under the action of an electromagnetic field of a certain strength, resulting in loss of information. Chinese invention patent application publication CN1502278 discloses a bank card anti-magnetic field anti-static anti-electromagnetic radiation box and wallet. The invention is a metal box-like container that can protect the magnetic card from the influence of magnetic and electric fields in the environment. According to the content mentioned in the description of the invention, the invention can effectively prevent the destruction of the stored information of the magnetic car...

Claims

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Application Information

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IPC IPC(8): H05K9/00
Inventor 张一凡哈元旭
Owner HARBIN INST OF TECH