CN1604730A - An electrical apparatus casing and making method thereof - Google Patents
An electrical apparatus casing and making method thereof Download PDFInfo
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- CN1604730A CN1604730A CN 200410086247 CN200410086247A CN1604730A CN 1604730 A CN1604730 A CN 1604730A CN 200410086247 CN200410086247 CN 200410086247 CN 200410086247 A CN200410086247 A CN 200410086247A CN 1604730 A CN1604730 A CN 1604730A
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- electrical apparatus
- apparatus casing
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Abstract
This invention is relates to an electrical product shell that with the electromagnetic wave absorbing function and its preparing method. The electrical product shell comprises of magnetic crystal powder or dielectric property powder, electromagnetic wave absorbing material such as natural or manual rubber, silica gel and plastic and findings. The electrical product shell is one or more layer. The shape is plate, cover, ring, ball, bubble cotton, or key plate. The electrical product shell can absorb electromagnetic wave from electrical product, prevent the influence of electromagnetic wave discharge, or absorb the electromagnetic wave to reduce the interference to electrical product.
Description
Technical field
The present invention relates to a kind of shell, particularly can be applicable to prevent electrotechnical apparatus radiation electromagnetic wave pollution or prevent electrical apparatus casing of electromagnetic wave intrusion interference electrotechnical apparatus work and preparation method thereof about a kind of.
Background technology
Electrotechnical apparatus, electronic product and electronic building brick thereof, as: integrated circuit (IC), central processing unit (CPU), signal amplifier (LNB), transformer (Transformer), motor (Motor) etc., they all can generate electromagnetic waves in self course of work inevitably, electromagnetic wave also can derive from the cabling on the circuit board (Trace) and each part connecting line in the electronic product, and cabling is long more and to walk the area that line loop (Loop) centers on big more, and then the electromagnetic wave radiation effect of the antenna that is caused (Antenna) is also big more; Keypad on the electrotechnical apparatus etc. also can generate electromagnetic waves.All these electromagnetic waves all can have bad influence for external environment and human body except meeting influences the operate as normal of electrotechnical apparatus itself.
In addition, when the powerful electromagnetic wave in the environment invades in the electrotechnical apparatus, electronic building brick such as semiconductor, integrated circuit, central processing unit etc. just become the object that electromagnetic wave destroys, this damage effect can undermine whole electrotechnical apparatus, make its function impaired, become nonvolatil destruction, again can't operate as normal without repairing.
Other has electromagnetic interference effect such as electromagnetic wave signal (EMI) when the external world invades electrotechnical apparatus, can make electrotechnical apparatus generation dysfunction, this is temporary interference, though can not destroy the part of electrotechnical apparatus, but also can influence work.
The shell of existing electrotechnical apparatus has wooden or plastics, and electromagnetic wave is not had prophylactic-therapeutic effect fully, has the sheathing material of electrotechnical apparatus now, itself there is no the function of anti electromagnetic wave; Shell also has metal material, electromagnetic electric field is had partly intercept effect, but only can change the direction of propagation, has no the effect of absorption, and electromagnetic wave energy still exists.
Along with the arriving of information age, the application of various electronic products is more extensive, and also more for serious, it is also more and more serious with the influence of peripheral things to electrotechnical apparatus itself for the electromagnetic wave that is produced.
Solve the electromagnetic wave pollution problem at present, generally adopt good obstruct (Shielding) mode of conduction, as: Copper Foil, aluminium foil, the short metal wire etc. of knitting, or employing produces the suppressor mode of inductive effect, as: add pottery iron ring (FerriteCore) etc., or employing produces the suppressor mode of capacity effect, as: shunt electric capacity (Bypass Capacitor) etc., or the suppressor mode of change antenna length and change cabling layout etc., these modes all are nothing but to wish and the electromagnetic wave radiation can be suppressed.
Yet, above-mentioned existing various settling modes are all just cured the symptoms, not the disease, because, according to law of conservation of energy (Conservation of Energy), when the electromagnetic wave radiation was suppressed by a certain position in the electrotechnical apparatus, then electromagnetic wave can move on to another position radiation; Same, when having suppressed the electromagnetic wave of a certain frequency, electromagnetic wave can occur with different frequencies again, and therefore, above-mentioned existing technical measures can't reasonably fundamentally solve the problem of electromagnetic wave radiocontamination.
The applicant discloses a kind of name and has been called " method for coating that anti electromagnetic wave leaks " (notification number is: application for a patent for invention CN1461176A), this method is with nonconducting composition, be made into energy conversion unit, with energy conversion unit 11,12,13,14 (as shown in Figure 1), be arranged on electromagnetic wave radioactive source 1,2,3, around 4, become heat energy to be discharged into the external world electromagnetic power conversion by energy conversion unit, reach and absorb electromagnetic purpose, thereby the electromagnetic wave that has reduced the electrotechnical apparatus radiation effectively leaks, or stops the interference of external electromagnetic ripple to electrotechnical apparatus work.As shown in Figure 2, be that energy conversion unit 21,22,23,24 is arranged in the original shell 1,2,3,4 of electrotechnical apparatus, and be coated on the mode of electromagnetic wave emission source outside.But no matter be that energy conversion unit is placed in the original shell of electrotechnical apparatus, still be placed on outside the original shell of electrotechnical apparatus, the capital forms sandwich construction, it is bigger to take up space, cost is higher relatively, and the original shell of electrotechnical apparatus still is a common material, there is no the electromagnetic effect of a bit control.
Summary of the invention
At above-mentioned existing in prior technology shortcoming, the purpose of this invention is to provide a kind of electrical apparatus casing that self has absorption electromagnetic wave function and preparation method thereof.
For achieving the above object, the present invention takes following technical scheme: a kind of electrical apparatus casing is characterized in that: described electrical apparatus casing is made by electromagnetic wave absorbent material.
The composition of described electromagnetic wave absorbent material is made up of the material of following percentage by weight: magnetocrystalline powder (magneticmateial) or dielectricity powder 30%～80%; Natural or artificial rubber or silica gel or plastics 10%～60%; Auxiliary material 10%～30%.
The composition of described auxiliary material and the total weight percent that accounts for electromagnetic wave absorbent material thereof are magnesium oxide 2%, zinc oxide 2%～3%, ethylidine sulphur 4%～6% and stearic acid 2%～4% etc.
That the shape of described electrical apparatus casing comprises is tabular, cover shape, the shape of rectifying, circular, spherical shape, foam shape or button are tabular.
Described electrical apparatus casing is one or more layers.
Described electrical apparatus casing comprises the shell of electrotechnical apparatus, mobile phone, computer, display, integrated circuit, central processing unit, signal amplifier, transformer, motor and the enclosing cover and the keypad of cabling and connecting line.
A kind of manufacture method of electrical apparatus casing may further comprise the steps: 1, with magnetocrystalline powder (magnetic mateial) or dielectricity powder 30%～80%; Natural or artificial rubber or silica gel or plastics 10%～60%; Auxiliary material 10%～30% mixes by weight proportion; 2, put into mould, with 130 ℃～190 ℃ heating; 3, with 100Kg～150Kg/cm
2Exert pressure; 4, natural cooling; 5, remove mould and just make electrical apparatus casing.
Add the metal blocker unit in the outside of described electrical apparatus casing or add nonmetal blocker unit.
Described metal blocker unit is selected from gold, silver, copper, iron, aluminium, platinum, stainless steel, alloy, ITO, organic compound, the short metal wire of knitting.
Described nonmetal blocker unit is to have conductivity but not as the conductive film of ground connection.
The present invention is owing to take above technical scheme, it has the following advantages: 1, the present invention will be owing to directly will absorb the shell that electromagnetic material becomes electrotechnical apparatus, therefore himself having electromagnetic power conversion is the function of heat energy, the electromagnetism of electrotechnical apparatus radiation can be involved the electromagnetic power conversion that the external world invades electrotechnical apparatus and become heat energy to discharge, absorb electromagnetic purpose thereby reach.2, the present invention adopts magnetocrystalline powder or dielectricity powder, rubber or silica gel or plastics and auxiliary material to make electrical apparatus casing, can with electromagnetic wave that electrotechnical apparatus radiated or extraneous invade a large amount of absorption of electromagnetic wave around the electrotechnical apparatus and be reduced to minimum, thereby electromagnetic wave is minimized to the influence of electrotechnical apparatus itself, external environment or human body etc.3, electrical apparatus casing of the present invention after testing, only improves ambient temperature below 1 ℃ absorbing electromagnetic wave and being converted in the process that heat energy discharges, and does not influence the original function of electrotechnical apparatus.4, electrical apparatus casing of the present invention has multiple shape, can be applicable to all kinds of electrotechnical apparatus, as electronic product shell such as mobile phone, computer, displays, the shell of electronic building bricks such as integrated circuit, central processing unit, signal amplifier, transformer, motor, the enclosing cover of cabling and connecting line etc. also can directly be made electromagnetic wave absorbent material electric appliance components such as keypad.Electrical apparatus casing of the present invention, manufacture method is simple, and raw material is easy to get, and is with low cost, and it is convenient to use, and very little to the influence of using environment, effect is remarkable.
Description of drawings
Fig. 1 is the structural representation in the applicant's patent applied for
Fig. 2 is another structural representation in the applicant's patent applied for
Fig. 3 is an electrical apparatus casing structural representation of the present invention
Fig. 4 is that electrical apparatus casing of the present invention absorbs electromagnetic experiment effect schematic diagram
Fig. 5 is that electrical apparatus casing of the present invention absorbs electromagnetic experiment effect schematic diagram
Embodiment
Feature of the present invention is to adopt to have the raw material that absorbs the electromagnetic wave function and directly make various electrical apparatus casings, and to account for the percentage by weight of material composition be 30%～80% for magnetocrystalline powder or dielectricity powder in the material composition; The percentage by weight that natural or artificial rubber or silica gel or plastics account for material composition is 10%～60%; With magnesium oxide, zinc oxide, ethylidine sulphur or stearic acid etc. is that the percentage by weight that auxiliary material accounts for material composition is 10%～30%, and the composition of auxiliary material also can comprise polyurethane resin, black smoke, benzothiazole disulfide; Described raw material is mixed by weight proportion, put into mould then, under 130 ℃～190 ℃ temperature conditions, heat, with 100Kg～150Kg/cm
2Exert pressure, natural cooling is made the electrical apparatus casing with definite shape that thickness is 0.1mm～50mm behind the dismounting mould then.
That the shape of shell comprises is tabular, cover shape, the shape of rectifying, circular, spherical shape, foam shape or button are tabular etc.Below describe the material mixture ratio and the manufacturing process of electrical apparatus casing of the present invention in detail by specific embodiment.
The making of embodiment 1, a kind of electrical apparatus casing of the present invention
(1) purchase raw material: total amount 100 grams, wherein:
Magnetocrystalline powder: 70 grams, particle diameter 10 μ, density 4g/ml;
Synthetic rubber: 15 grams;
Zinc oxide: 3 grams;
Magnesium oxide: 2 grams;
Ethylidine sulphur: 6 grams;
Stearic acid: 4 grams.
(2) with after the above-mentioned raw materials mixing, put into mould, through 180 ℃ of temperature heating, with 110Kg/cm
2Exert pressure.
(3) natural cooling.
(4) form removal, being made for thickness is the tabular electrical apparatus casing of 1.6mm.Being used for wireless network radiates S (the electromagnetic electrotechnical apparatus of 2～4GHz) frequency bands is as shell.
The making of embodiment 2, another kind of electrical apparatus casing
(1) purchase raw material: total amount 100 grams, wherein:
Magnetocrystalline powder: 55 grams, particle diameter 20 μ, density 3g/ml;
Natural rubber: 35 grams;
Zinc oxide: 2 grams;
Magnesium oxide: 2 grams;
Ethylidine sulphur: 4 grams;
Stearic acid: 2 grams.
(2) with after the above-mentioned raw materials mixing, put into mould, through 180 ℃ of temperature heating, with 110Kg/cm
2Exert pressure.
(3) natural cooling.
(4) form removal is made for the tabular electrical apparatus casing of thickness 1.6mm.Being used for satellite communication device radiates Ku (the electromagnetic electrotechnical apparatus of 12～18GHz) frequency bands is as shell.
Utilize a kind of electrical apparatus casing of embodiment 1 preparation, (electromagnetic wave of 2～4GHz) frequency bands is an experimental subjects, does the electro-magnetic wave absorption experiment at wireless network S.With the tabular shell of this kind, the Bluetooth system that is used for wireless network is done shell, and it absorbs electromagnetic effect as shown in Figure 4.
The Building X is designated as wave frequency (GHz) among the figure; The Building Y is designated as attenuation by absorption (db).Experimental result shows that the tabular shell of embodiment 1 preparation is applied to Bluetooth system and does shell, can make the electromagnetic wave effective attenuation.
Utilize a kind of electrical apparatus casing of embodiment 2 preparations, (electromagnetic wave of 12～18GHz) frequency bands is an experimental subjects, does the electro-magnetic wave absorption experiment at satellite communication Ku.With the tabular shell of this kind, the frequency demultiplier that is used for satellite communication is done shell, and it absorbs electromagnetic effect as shown in Figure 5.
The Building X is designated as wave frequency (GHz) among Fig. 5, and the Building Y is designated as attenuation by absorption (db).Experimental result shows that the tabular shell of embodiment 2 preparations is applied to frequency demultiplier and does shell, can make the electromagnetic wave effective attenuation.
In the various embodiments described above, shell can convert electromagnetic wave energy to heat energy, and discharges, and the temperature that improves electromagnetic wave absorbent material is less than 1 ℃.
When the foregoing description 1,2 is made electrical apparatus casings, can make multiple shape by different moulds, tabular etc. as lid shape, the shape of rectifying, circular, spherical shape, foam shape or button, be used for various electrotechnical apparatus and make shell.
The application of embodiment 5, electrical apparatus casing of the present invention.
As shown in Figure 3, be electrical apparatus casing of the present invention structural representation when using.The electrical apparatus casing that among Fig. 3 31,32,33,34 constitutes with electromagnetic wave absorbent material for the present invention, outer cover or in cover any electromagnetic wave absorbent material that adds.
When using electrical apparatus casing of the present invention,, can adopt the structure of multilayer package simultaneously for strengthening it to the absorption of electromagnetic wave function.For strengthening electrical apparatus casing of the present invention to the absorption of electromagnetic wave function, as required, can add the metal blocker unit in the outside of electrical apparatus casing of the present invention, this metal blocker unit can be gold, silver, copper, iron, aluminium, platinum, stainless steel, alloy, ITO, organic compound, lacks blocker unit such as knitting metal wire; Or add nonmetal blocker unit, as has conductivity but not as the blocker unit such as conductive film of ground connection.
Claims (10)
1, a kind of electrical apparatus casing is characterized in that: described electrical apparatus casing is made by electromagnetic wave absorbent material.
2, a kind of electrical apparatus casing as claimed in claim 1 is characterized in that, the composition of described electromagnetic wave absorbent material is made up of the material of following percentage by weight: magnetocrystalline powder or dielectricity powder 30%～80%; Natural or artificial rubber or silica gel or plastics 10%～60%; Auxiliary material 10%～30%.
3, a kind of electrical apparatus casing as claimed in claim 2 is characterized in that: the composition of described auxiliary material and the percentage by weight that accounts for electromagnetic wave absorbent material thereof are magnesium oxide 2%, zinc oxide 2%～3%, ethylidine sulphur 4%～6% and stearic acid 2%～4%.
4, a kind of electrical apparatus casing as claimed in claim 1 is characterized in that: the shape of described electrical apparatus casing comprises that tabular, lid shape, frame shape, circular, spherical shape, foam shape or button are tabular.
5, a kind of electrical apparatus casing as claimed in claim 1 is characterized in that: described electrical apparatus casing is one or more layers.
6, as claim 1 or 2 or 3 or 4 or 5 described a kind of electrical apparatus casings, it is characterized in that: described electrical apparatus casing comprises the shell or the keypad of electrotechnical apparatus, mobile phone, computer, display, integrated circuit, central processing unit, signal amplifier, transformer, motor, cabling and connecting line.
7, as claim 1 or 2 or 3 or 4 or 5 described a kind of electrical apparatus casings, it is characterized in that: the outside of described electrical apparatus casing adds the metal blocker unit or adds nonmetal blocker unit.
8, a kind of electrical apparatus casing as claimed in claim 7 is characterized in that: described metal blocker unit comprises gold, silver, copper, iron, aluminium, platinum, stainless steel, alloy, ITO, organic compound, shortly knits in the metal wire one or more.
9, a kind of electrical apparatus casing as claimed in claim 7 is characterized in that: described nonmetal blocker unit is to have conductivity but not as the conductive film of ground connection.
10, a kind of manufacture method of electrical apparatus casing may further comprise the steps:
(1), magnetocrystalline powder or dielectricity powder 30%～80%, natural or artificial rubber or silica gel or plastics 10%～60%, auxiliary material 10%～30% mixes;
(2) mixed material is put into mould, with 130 ℃～190 ℃ heating;
(3) with 100Kg～150Kg/cm
2Exert pressure;
(4) natural cooling;
(5) remove mould and make electrical apparatus casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410086247 CN1604730A (en) | 2004-10-28 | 2004-10-28 | An electrical apparatus casing and making method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410086247 CN1604730A (en) | 2004-10-28 | 2004-10-28 | An electrical apparatus casing and making method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1604730A true CN1604730A (en) | 2005-04-06 |
Family
ID=34667084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410086247 Pending CN1604730A (en) | 2004-10-28 | 2004-10-28 | An electrical apparatus casing and making method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1604730A (en) |
-
2004
- 2004-10-28 CN CN 200410086247 patent/CN1604730A/en active Pending
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