CN2627625Y

CN2627625Y - Electromagnetic shielding observation window

Info

Publication number: CN2627625Y
Application number: CN 03228682
Authority: CN
Inventors: 李宏强; 陈鸿
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2003-01-31
Filing date: 2003-01-31
Publication date: 2004-07-21
Anticipated expiration: 2013-01-31

Abstract

An electromagnetic screening observation window consists of single or multi-layer metal grid, and single or multi-layer semiconductor quantum well-like optical thin film. The observation window is characterized in that the every metal grid consists of metal wires which are single-unit straightened or multi-unit straightened, any two metal wires in every unit are in the same plane and parallel each other, and any two metal wires in the different unit are not parallel. The vertical distance between the two adjacent metal wires in any unit is no more than one half of the wavelength of the cutoff microwave. The material which the metal grid is made of is metal or alloy with good electric conduction, such as gold, sliver, copper, aluminum, and stainless steel and so on, which can be used for various electromagnetic pollution shielding and information leakage shielding window or hyalosome, and also can be used for such areas like electromagnetic compatibility and the leakage shielding of high-power microwave etc.

Description

A kind of electromagnetic screen view window

Technical field:

The utility model relates to a kind of view window that is used for electromagnetic wave shielding, particularly a kind of electromagnetic screen view window that is made of the optics laminated film of wire netting and based semiconductor quantum well symmetrical structure.

Background technology:

The view window that is used for electromagnetic wave shielding in the prior art has the materials such as metal and dielectric composite multilayer membrane of wire gauze and multilayer.The wire gauze view window that is used for electromagnetic wave shielding is made up of in material transparent the wire gauze blow.But the microwave wavelength of its work cutoff frequency correspondence is not less than 2 times of the big distance of metal gauze net Kongzui.Along with increasing of frequency, if reach the shield effectiveness good to the electromagnetic wave more than the 1G hertz, more than 50DB, so tinsel to work out crypto set more, mesh also requires littler, requires to use more multiple wire gauze or more groups tinsel simultaneously, this will greatly reduce the transparent effect of view window, so that lose transparent effect, so the frequency of operation of this kind microwave view window is many between 1M (106) hertz to 1G (109) hertz.Being used between the shadow zone of metal and dielectric composite multilayer membrane of electromagnetic wave shielding can be from infrared until microwave and all longer wave frequency of wavelength, and choosing of suitable structural design and material can also shield ultraviolet.But in microwave region very desirable shield effectiveness can not be arranged because the gross thickness of the metal film that adopts is extremely thin.Metal itself has strong absorption and metal film can not be done very thick visible light, and for example the silverskin transmitance peak value of individual layer 50 nanometer thickness is less than 7%.If can improve the width of visible region transmissivity peak value and high transparent region greatly with relatively thin metal multilayer film, but the conductivity of metal film significantly decreases than the conductivity of metallic body materials at this moment, along with the thickness attenuation, the degree that its conductivity descends is obviously aggravated, lose the transparent effect of window if adopt the metal film of the too much number of plies also can cause the obvious decline of visible region transmissivity, the metal and dielectric multilayer film that above-mentioned reason has also determined desirable transparency is difficult to above the attenuating of 40DB for the microwave more than the 1G and can not be used for microwave view window under the upper frequency.

The utility model content:

The purpose of this utility model is to solve the problems referred to above in the prior art, and the utility model provides a kind of electromagnetic screen view window that is made of the optics laminated film of substance or multiple wire gauze and based semiconductor quantum well symmetrical structure for solving the technical scheme that the problems referred to above adopted in the prior art.When guaranteeing the 40-60% transmissivity, make the microwave region of the higher frequency more than the 1G hertz that the shielding more than the 50DB is arranged.

In the utility model, described substance or multiple wire gauze are characterised in that: arbitrary heavy metal silk screen is organized stretching or is organized stretching filament more by list and constitutes, all in same plane and parallel to each other, any two filaments on the same group are not parallel each other for any two filaments in every group of filament.Vertical range in arbitrary group of tinsel between adjacent two filaments is not more than desired 1/2 times by microwave wavelength.The diameter of described filament is between 0.005 millimeter to 5 millimeters, and material adopts electric conductivity good metal or alloy, as gold, silver, copper, aluminium, stainless steel etc.Every filament two ends all reach or surpass the position at respective window place and cover window fully.

The similar of described metal and dielectric laminated film is in semiconductor quantum well structures, two inducing layers and the middle functional layer of being placed by symmetry constitute, the inducing layer that described symmetry is placed on the functional layer both sides is respectively transparent two-layered medium film-substrate, the arrangement of its structure and each layer film is respectively as A1B1 and B2A2, wherein A1, A2 and B1, B2 represent two kinds of transparent materials with different refractivity respectively, as zinc sulphide and magnesium fluoride.The actual (real) thickness of each inducing layer in 2.0 nanometers between 10000.0 nanometers, the optical thickness of two inducing layers can be identical or different, the thickness proportion of the film in two inducing layers can be identical or different, the thickness of described functional layer, can be made of a kind of, two or more deielectric-coating and metal film between 10000.0 nanometers in 3.0 nanometers; Described functional layer comprises one deck metal dielectric-coating at least, and perhaps metal film, dielectric or the semiconductor medium film by multilayer constitutes, and every layer of metal film both sides are dielectric media film or semiconductor film, and the thickness of each layer metal can be the same or different.The dielectric media film that each layer is made of same material or the thickness of semiconductive thin film can be the same or different.Thickness is compounded between the inducing layer of symmetry placement to the functional layer between 10000.0 nanometers in 2.0 nanometers, structure such as A1B1CB2A2, the corresponding inducing layer of the A1B1 of front, corresponding another inducing layer of the B2A2 of back, the functional layer that composite dielectric dielectric film or semiconductor medium film are constituted in the metal level of the corresponding individual layer of middle C or the metal level of multilayer, wherein not compound in Yi Bian the inducing layer with the compound film A1 of functional layer or A2 and transparent backing material, perhaps all not compound with transparent backing material respectively in the inducing layer on both sides with compound film A1 and the A2 of functional layer, composite methods can deposited by electron beam evaporation or the method for sputter realize, between inducing layer and the functional layer, compound in the each several part between adjacent each layer film also can deposited by electron beam evaporation or the method for sputter realize.This structure shields other longer electromagenetic wave radiation of most infrared radiations, UV radiation and wavelength when can allow a part or most visible transmission, perhaps shield other longer electromagenetic wave radiation of most infrared radiations, ultraviolet and wavelength in the high transmission of the visible waveband that requires.For the situation that metal multilayer film is arranged in the functional layer, if guarantee in the visible-range of broad, the fluctuating of transmissivity is less, the characteristics of high regional transmission broad, keeping under the condition that the metal film gross thickness is constant, number of metal is constant, can be thicker near the thickness of metal film in the middle of the functional layer, the thickness the closer to the metal film of both sides inducing layer is thin more simultaneously, comprise this moment functional layer and both sides inducing layer one-piece construction all near or reach the center symmetry.When keeping both sides inducing layer total optical thickness separately, suitably regulate the thickness of two kinds of different transparent mediums in each inducing layer, by regulate the difference that can obtain high low transmissivity in the high regional transmission be not more than average transmittance 3% or 10% in.Two inducing layers described in the utility model also can comprise the double-layer transparent film structure more than one-period respectively, ABAB...AB for example, be BABA...BA at the functional layer opposite side accordingly, the inducing layer that perhaps mixes simultaneously in functional layer forms multiple quantum trap structure, the inducing layer that the utility model highlights both sides has the situation of identical periodicity and identical optics gross thickness, and this moment is because resonant reflection effect and easier reaching has the very wide desirable effect of the utility model such as high regional transmission repeatedly.

Preferentially being chosen as in the utility model: have at least two groups of tinsels orthogonal; Have at least one filament conducting in layer of metal film and at least one group of filament in the composite multilayer membrane at least; The shell conducting or the ground connection that have layer of metal film and anti-microwave in the composite multilayer membrane at least; At least one filament at least one group of filament and the shell conducting or the ground connection of anti-microwave.

In the transparent materials such as the molten solid polyester that at one end is compounded with the metal and dielectric multilayer film of wire gauze, glass, perhaps be bonded on the transparent substrates that is compounded with the metal and dielectric multilayer film in the utility model with transparent bonding agent.The utility model and prior art contrast, and combine the advantage of different technologies, specifically comprise: 1) more sparse wire gauze can reach the shielding attenuation effect to the microwave 20-30DB between the 30G hertz to 1G.2) the metal and dielectric film composite material of based semiconductor quantum well structure is having the shielding attenuation effect of 30-40DB to keep good properties of transparency simultaneously in the visible region to microwave in the wide frequency ranges very much.3) under the situation of HIGH-POWERED MICROWAVES radiation, thereby wire gauze has very big attenuation to make film be not easy to assemble a large amount of heat fractures to microwave and damages.

In general, the microwave region and the longer electromagenetic wave radiation of wavelength of the utility model shielding requirements when the assurance visible region better sees through characteristic, obtain the transparency desirable simultaneously as microwave, radiowave, can be used for the application of aspects such as anti-electromagnetic pollution, anti-microwave leakage and electromagnetic compatibility in the visible region.

Description of drawings:

Fig. 1 is a kind of electromagnetic screen view window of the present utility model.

Fig. 2 is the synoptic diagram of the functional layer structure in a kind of electromagnetic screen view window of the present utility model.

Fig. 3 is the vertical projection synoptic diagram of wire gauze in the view window plane in a kind of electromagnetic screen view window of the present utility model.

Embodiment:

As shown in Figure 1, realize that optimal way of the present utility model is: the electromagnetic screen view window of a kind of based semiconductor quantum well structure of the utility model is made of substance or multiple wire gauze and the single or multiple lift metal and dielectric multilayer film of based semiconductor quantum well structure.Wire gauze wherein is made of two groups of mutually perpendicular copper wires shown in 4 parts among the figure one, and the diameter of copper wire is 0.045 millimeter, and the distance in every group of copper wire between any two two parallel copper wires that face is 2 millimeters.Not directly conducting between two groups of copper wires, all blow is in quartz glass.The one side of glass is compounded with the single or multiple lift metal and dielectric multilayer film of based semiconductor quantum well structure.In another preferred embodiment of the present utility model, copper wire is changed to the metal filamentary silver of 0.04 mm dia.Multi-layer film structure in the utility model is made of inducing

layer

1,3 and functional layer 2, described inducing

layer

1,3 is made of two-layer transparent dielectric film A1, B1 and B2, A2 respectively, described functional layer 2 adopts metal material, described functional layer 2 is compounded between the inducing

layer

1,3, to between 9000 nanometers, described functional layer is a single-layer metal film to the thickness of described functional layer 2 in 3 nanometers.As shown in Figure 2, described functional layer 2 also can be made of the metal film and the dielectric media film of multilayer.Described functional layer is compound to described inducing layer can adopts the electron beam evaporation in the prior art or the method for sputter.In a preferred embodiment of the present utility model, film A1, A2 in the inducing

layer

1,3 adopt zinc sulphide, and both thickness is identical, in 2 nanometers between 150 nanometers.Film B1, B2 adopt magnesium fluoride, and both thickness is identical, in 2 nanometers between 250 nanometers.Inducing

layer

1,3 symmetry is placed.The optics gross thickness of two inducing layers is identical.Functional layer 2 adopts thickness at the single-layer metal silverskin of 5 nanometers to 60 nanometers.In another preferred embodiment of the present utility model, film A1, A2 in the inducing

layer

1,3 symmetry is placed.The optics gross thickness of two inducing layers is identical.It is 5 nanometers to the metal silverskin and 2 layer thicknesses of 60 nanometers is the magnesium fluoride films of 100 nanometers to 200 nanometers that functional layer 2 adopts 3 layer thicknesses.Its arrangement mode is every double layer of metal film therebetween one deck dielectric film.

Claims

1, a kind of electromagnetic screen view window is made of substance or multiple wire gauze and the optical thin film of single or multiple lift, it is characterized in that: contain layer of metal film in the described optical thin film at least.

2, a kind of electromagnetic screen view window as claimed in claim 1 is characterized in that: wherein contain a heavy metal silk screen at least, every heavy metal silk screen is made of one or more groups stretching filament.

3, a kind of electromagnetic screen view window as claimed in claim 2 is characterized in that: any two filaments all are in the same plane and parallel to each other in every group of filament.

4, a kind of electromagnetic screen view window as claimed in claim 2, it is characterized in that: filament on the same group is not parallel each other.

5, as claim 2,3 described a kind of electromagnetic screen view windows, it is characterized in that: every group of tinsel all has another group tinsel discord at least, and it is parallel.

6, as claim 2,3 described a kind of electromagnetic screen view windows, it is characterized in that: in the described arbitrary group of tinsel, the vertical range between two adjacent and parallel filaments is not more than desired 1/2 times by microwave wavelength.

7, as claim 2,3 described a kind of electromagnetic screen view windows, it is characterized in that: every group of tinsel all has at least another group tinsel vertical with it.

8, as claim 2,3 described a kind of electromagnetic screen view windows, it is characterized in that: the vertical range in every group of tinsel between adjacent and parallel two filaments is not more than desired 1/4 times by microwave wavelength.

9, as claim 2,3 described a kind of electromagnetic screen view windows, it is characterized in that: the vertical range in every group of tinsel between adjacent and parallel two filaments is not more than desired 1/6 times by microwave wavelength.

10, as claim 2,3 described a kind of electromagnetic screen view windows, it is characterized in that: the vertical range in every group of tinsel between adjacent and parallel two filaments is not more than desired 1/10 times by microwave wavelength.

11, a kind of electromagnetic screen view window as claimed in claim 2, it is characterized in that: the diameter of described filament is between 0.00002 millimeter to 5 millimeters.

12, a kind of electromagnetic screen view window as claimed in claim 1, it is characterized in that: it is high through the regional transmissivity that has more than or equal to 50%, the electromagnetic wave of shielding requirements microwave region and radio wave band, reveal be not more than 100,000 of incident electromagnetic wave energy/.

13, a kind of electromagnetic screen view window as claimed in claim 1 is characterized in that: described height sees through the zone and comprises near infrared and mid infrared region.

14, a kind of electromagnetic screen view window as claimed in claim 1 is characterized in that: place 1M to the scope of 1G hertz to the shielding attenuation of microwave more than 60DB, high regional transmission transparency is between 60-90% in the visible region.

15, a kind of electromagnetic screen view window as claimed in claim 1 is characterized in that: place 1G to the scope of 10G hertz to the shielding attenuation of microwave more than 50DB, high regional transmission transparency is more than 50% in the visible region.

16, a kind of electromagnetic screen view window as claimed in claim 1 is characterized in that: place 10G hertz is decayed more than 50DB to shielding electromagnetic waves in the scope of far infrared band, and high regional transmission transparency is more than 40% in the visible region.

17, a kind of electromagnetic screen view window as claimed in claim 1, it is characterized in that: described metal and dielectric multilayer film is made of inducing layer and the middle functional layer that symmetry is placed on both sides, the inducing layer that described symmetry is placed on both sides respectively is made of two-layer different transparent dielectric film, the inducing layer optical thickness of both sides is identical, and described functional layer is compounded between the inducing layer of symmetry placement.

18, it is characterized in that as claim 1,2,3,20 described a kind of electromagnetic screen view windows:, have at least one filament conducting in layer of metal film and at least one group of filament in the composite multilayer membrane at least.

19, a kind of electromagnetic screen view window as claimed in claim 20 is characterized in that: the shell conducting or the ground connection that have layer of metal film and anti-microwave in the composite multilayer membrane at least.

20, as claim 1,2,3 described a kind of electromagnetic screen view windows, it is characterized in that: at least one filament at least one group of filament and the shell conducting or the ground connection of anti-microwave.