CN2181731Y

CN2181731Y - Computer electromagnetic field protection apparatus

Info

Publication number: CN2181731Y
Application number: CN 93232299
Authority: CN
Inventors: 王宗光
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-11-18
Filing date: 1993-11-18
Publication date: 1994-11-02
Anticipated expiration: 2003-11-18

Abstract

The utility model relates to an electromagnetic field protection device which is mainly used for a computer display. The electromagnetic field protection device is composed of a protection screen (1), a protection cover (2) and an earthing device (3). The protection screen is made of special transparent conductive glass or transparent conductive plastic. The electromagnetic radiation in front of the screen of a computer can be screened by the protection screen, and the protection screen can not hinder a user to watch the screen. The protection cover is made of plastic cloth or glass fibre cloth which is plated by metal film or conductive material. The electromagnetic radiation at the back of the screen and around the screen can be screened by the protection cover. When the protection screen and the protection cover are matched to be used, the electromagnetic radiation from various directions of the computer can be screened. The utility model adopts a mode that a plug is connected with the ground. The installation and the use are convenient and reliable. The utility model can effectively prevent the electromagnetic field of a computer from irradiating a human body.

Description

Computer electromagnetic field protection apparatus

The utility model relates to a kind of electromagnetic field protective device, especially for the electromagnetic field protective device of computer monitor.

According to the interrelated data report, the electromagnetic field radiation of computer monitor can be detrimental to health.Confirm that after deliberation electromagnetic frequency is high more, intensity is big more, and duration of contact is long more, and harm is just serious more.Its main harm to human body is: influence endocrine, influence blood and generate, influence immunologic function, cause the central nervous system dysfunction, cause people's eye cataract, even can cause cancer; Show as headache in addition, malaise, amnesia, arthralgia, degradation under vision, the acouesthesia degree.United Nations Conference on Human Environment is consistent to be thought: electromagnetic radiation is the major pollutants that cause public hazards.For example, live in the people under the environment that electromagnetic intensity is 0.3 little tesla for a long time, leukemic possibility is higher 4 times than common people.And before display in the 0.3-1 rice scope maximum intensity of electromagnetic field be generally the little tesla of 0.5-2.Therefore electromagnetic field radiation has become the invisible by the side of killer of computer operator, the dangerous condition that the computer operater is in fall ill.In recent years, this problem causes domestic and international people's serious concern day by day.I was in application in 1991 and obtain the national patent of a protection computer electromagnetic field radiation--and " the electromagnetic-field-shielded cover of computer monitor " (national patent number: 91221749.9, letters patent book number: 88829).This patent is a kind of protective device of monolithic construction, can carry out omnibearing protection to the radiation of computer electromagnetic field.But because this all-in-one-piece structure, in processing and manufacturing, all not too convenient when transporting and installing and using, and the function of conducting film is comparatively single, therefore be necessary formation and performance to this version, conducting film, and the concrete grammar of shield ground connection improves.

The purpose of this utility model just provides a kind of follow-on computer electromagnetic field protective device, and it can protect the computer electromagnetic field effectively and pollute, and this device is in processing and manufacturing, when transporting and installing and using, convenient reliable and safety.

Task of the present utility model be achieved in that adopt with last patent (patent No. 91221749.9) the identical shielding material and the basis of shielding mode on, change original monolithic construction into fabricated structure.Be that the utility model is made up of protecting screen, protective cover and earthing device three parts.Protecting screen is made up of extraordinary transparent conducting glass (or electrically conducting transparent plastics), framework, binding post and support, hangs over the front of computer screen during use.Protective cover is to be made by Polypropylence Sheet that is coated with metallic film or conductive material or glass fabric, is enclosed within the back of computer monitor during use.Earthing device is made up of binding post plug, external wire and ground pin.

As everyone knows, the shielding of electromagnetic field is to isolate with the conductive shield body of ground connection to realize.It is that the counter magnetic field that utilizes electromagnetic induction phenomenon to produce eddy current in the conductive shield surface is offset former magnetic field, reaches the purpose of the former electromagnetic field radiation of shielding.The electric conductivity of shield and ground connection situation are the principal elements that influences effectiveness.Therefore, the utility model adopts good extraordinary transparent conducting glass (or electrically conducting transparent plastics) of electric conductivity and compliant conductive cloth as shield, and employing plug earthing mode, just the shielding problem of settlement computer electromagnetic field of high frequency radiation effectively.The utility model and general computer eyesight protection screen etc. have essential distinction.General eyesight protection screen is to use lead glass to make, and can only absorb X ray; Common nylon optical filtering net can only vision protection; The metal web that contains carbon, silicon, lead and other elements can only shield low frequency electromagnetic field; These devices all do not possess the function of shielding electromagnetic field of high frequency radiation.

The employed transparent conducting glass of the utility model protecting screen (or plastics) is to plate layer of semiconductor material (indium tin oxide etc.) film on the surface of simple glass (or transparent plastic); Or plate one deck conduction can property good metal (as aluminium, copper, silver etc.) film; Or plate composite conductive film by the combination of metal film and transparent conductive material; These conducting films all have the effect of shielding electromagnetic field of high frequency.In addition, also can plate the layer of transparent conducting film on the net at the metal fibre of carbon containing, silicon, lead and other elements, this composite conducting layer just has the double action of screen high frequency and low frequency magnetic field radiation.The face resistance of transparent conducting glass (or plastics) conducting film can be between 10-100 ohm.Transparent conducting glass (or plastics) is installed in plastics or the metal framework, and support is equipped with in the framework both sides, so that before hanging over computer screen.In a side of framework a binding post is installed, the conductive layer and the binding post of electro-conductive glass is linked, by earthing device ground connection.In addition, electro-conductive glass can plate conducting film at single face, also can be at two-sided plating conducting film.Two-sided plating conducting film has better shield effectiveness to electromagnetic radiation.In addition, also can plate the layer of transparent conducting film, make the electrically conducting transparent plastic sheeting at transparent plastic film, be attached to computer screen before, and with conducting film ground connection.

The employed flexible conducting material of the utility model protective cover is to plate the layer of metal film on the surface of Polypropylence Sheet or glass cloth, as aluminium, copper, silver etc.Its shield effectiveness to the electromagnetic field of high frequency can reach the 50-65 decibel.After flexible conducting material cut out, be sewn into hood-shapedly, be enclosed within the back of computer.Protective cover links by lead and earthing device.

Earthing mode of the present utility model adopts the plug earthing mode.Be transparent conducting glass (or electrically conducting transparent plastics) and radome conductive layer all with framework on binding post link, the binding post plug links by an external wire and ground pin.Ground pin can adopt three-pin plug or single n pin package n.When using three-pin plug, external wire only with plug in ground wire plug link; Remaining two plug is on the shelf, only plays the role of positioning, and can prevent that ground wire plug from mispluging in the live wire socket.This plug earthing mode is directly compared with the joining earthing mode of computer base plate with the sort of earthing device, and is both safe and reliable, easy to use again.As when using single n pin package n, before ground wire plug inserts supply socket, should be charged with having or not in the test pencil test ground line socket earlier, get an electric shock to prevent wrong plug.

The utility model has good shielding action to the computer high frequency electromagnetic radiation, can guarantee that the computer operater works under the environment of safety.Under the situation of long-term unmanned work, shield assembly also can only use protecting screen and not use radome around computer, operating personnel's health before the same slow-witted protection computer.

Below with reference to drawings and Examples the utility model is described in detail.

Fig. 1 is the structural representation of electromagnetic field protecting screen of the present utility model and earthing device.

Fig. 2 is the structural representation of electromagnetic field protective cover of the present utility model.

With reference to Fig. 1.The structure of protecting screen of the present utility model is, transparent conducting glass (1) is installed in by in plastics or the metal framework (2), hang over computer screen by support (3) before, the conductive layer and the binding post on the framework (4) of electro-conductive glass linked.Earthing device is made up of binding post plug (5), external wire (6) and ground pin (7).Before protecting screen is hung over computer screen, and with binding post plug (5) insertion (4) binding post, when ground pin (7) was inserted indoor power supply ground line socket, protecting screen had just had the shielding action to electromagnetic field.

With reference to Fig. 2.The structure of protective cover of the present utility model is behind the Polypropylence Sheet or glass cloth (1) cutting with metal-coated films or conductive material, to be sewn into the cover type.The rear portion of protective cover and top have louvre (2), and the conductive layer of cover links by a lead and a metal clip (3).During use, metal clip is clipped on the binding post of protecting screen.

Claims

1, a kind of electromagnetic field protective device that is used for computer monitor, feature is: the protecting screen of being made by transparent conductive body hangs over the computer front, the shielding cover of being made by compliant conductive cloth is in the computer back, and the conductive layer of protecting screen and protective cover all links and ground connection with earthing device.

2, electromagnetic field protective device according to claim 1, feature is: protecting screen is made up of transparent conducting glass or plastics, framework, binding post and support.

3, electromagnetic field protective device according to claim 1, feature is: the conductive layer of protecting screen transparent conducting glass can be the plating semiconductor material thin film, and its face resistance can be at 10-100 ohm.

4, electromagnetic field protective device according to claim 1, feature is: the conductive layer of protecting screen transparent conducting glass, can be aluminize, metallic film such as copper, silver.

5, electromagnetic field protective device according to claim 1, feature is: the conductive layer of protecting screen transparent conducting glass can be the laminated film of metal-coated membrane and transparent conductive material.

6, electromagnetic field protective device according to claim 1, feature is: the conductive layer of protecting screen shield can be to plate nesa coating in metal web.

7, electromagnetic field protective device according to claim 1, feature is: can plate conducting film at the single or double of protecting screen clear glass or plastics.

8, electromagnetic field protective device according to claim 1, feature is: the employed shielding material of protective cover is plating layer of metal film or a conductive material on Polypropylence Sheet or glass cloth.

9, electromagnetic field protective device according to claim 1, feature is: the earthing mode of earthing device is to adopt three-pin plug or single n pin package n ground connection.