CN103260387A - Electromagnetic wave shielding device - Google Patents
Electromagnetic wave shielding device Download PDFInfo
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- CN103260387A CN103260387A CN2012105957621A CN201210595762A CN103260387A CN 103260387 A CN103260387 A CN 103260387A CN 2012105957621 A CN2012105957621 A CN 2012105957621A CN 201210595762 A CN201210595762 A CN 201210595762A CN 103260387 A CN103260387 A CN 103260387A
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- circuit board
- electromagnetic wave
- metallic plate
- shielding device
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Abstract
An electromagnetic wave shielding device comprises at least one metal plate, and electromagnetic wave absorption materials are arranged on one side face of the metal plate. The side face, provided with the electromagnetic wave absorption materials, of the metal plate covers an area to be detected of a circuit board to absorb and shield electromagnetic waves produced in the area to be detected, meanwhile, the electromagnetic waves penetrating through the electromagnetic wave absorption materials are blocked by the metal plate, therefore, the electromagnetic waves can be effectively absorbed and isolated in the area to be detected of the circuit board and will not be transmitted to electronic components in other areas of the circuit board. Meanwhile, the electromagnetic wave shielding device covers the area to be detected in a thin-plate-structure mode, and therefore the electromagnetic wave shielding device will not be limited by usable space of the circuit board.
Description
Technical field
The present invention is relevant for a kind of screening arrangement, and particularly a kind of electromagnetic wave shielding device is covered in the district to be measured of circuit board.
Background technology
Along with the fast development of electronics technology, the function of various electronic products and use also variation day by day, relative making be arranged at printed circuit board (PCB) in the electronic product (Printed Circuit Board, PCB) more complicated on designing and developing.And in the process of the manufacturing of circuit board in order to get rid of the mistake of non-research and development design, the for example bad short circuit that causes of circuit board making or broken string, or product line group process of assembling careless mistake and problem (as the part wrong plug) of causing etc., therefore before circuit board shipment in enormous quantities, pointer test such as need carry out for example short circuit or open circuit is to guarantee the shipment quality of circuit board.
At present on the method for confirming board quality, in the printed a plurality of leads of circuit board surface, has specific lead in order to the purposes as the test electrical functionality usually.And be provided with the test point that electrically connects with these leads in circuit board.Provide the testing tool of measuring these test points then, for the pointer property testing operation of carrying out board quality.Yet, after circuit board is finished quality test, these test points that are arranged on the circuit board just do not have other purposes, but these test points become electromagnetic interference (Electro Magnetic Interference, one of source EMI) of printed circuit board (PCB).
Electromagnetic interference is a big problem that exists in the present electronic industry, and it can make other electronic building brick that is arranged on the circuit board be interfered, and the normal work of influence operates, and therefore need reduce the degree of electromagnetic interference as much as possible.At present for the method that reduces electromagnetic interference; except on circuit board, arranging the ground plane; usually can lay the ground connection Copper Foil in district to be measured and increase contact area; reducing electromagnetic interference by the impedance of dwindling some grounded circuit, or in district to be measured metallic shield being set reduces electromagnetic interference.But often because the electromagnetic wave shielding of Copper Foil is limited in one's ability, and can't provide enough electromagnetic interference shield effects.Though the electromagnetic wave shielding ability of metallic shield is better than Copper Foil, precisely because occupy certain volume in the use, and can be quite limited for the space of its setting on the circuit board, make the restriction that is subjected to certain degree in the use of metallic shield.
Therefore, at present industry is for the electromagnetic interference problem in circuit board district to be measured, still in the use restriction of seeking to overcome circuit board space, and can improve the electromagnetic interference shield method of screening ability simultaneously.
Summary of the invention
In view of above problem, the invention provides a kind of electromagnetic wave shielding device, existing prevent or reduce in the method for electromagnetic interference to improve, limited for the shield effectiveness of electromagnetic interference, and be subject to the problem of circuit board usage space.
To achieve these goals, the present invention discloses a kind of electromagnetic wave shielding device, and in the district to be measured that is covered in circuit board, this circuit board is arranged in the housing, and this district to be measured produces electromagnetic wave is arranged, and it is characterized in that this electromagnetic wave shielding device includes:
At least one metallic plate; And
At least one electro-magnetic wave absorption material is arranged on two different sides of this metallic plate;
Wherein, this metallic plate is covered in this district to be measured with the side with this electro-magnetic wave absorption material, and to absorb and to shield this electromagnetic wave, the opposite side electromagnetic wave absorbent material is used for placing the electromagnetic interference of environment.
Above-mentioned electromagnetic wave shielding device wherein, also comprises a prepreg, and this prepreg is arranged on the side of this electro-magnetic wave absorption material with respect to this district to be measured.
Above-mentioned electromagnetic wave shielding device wherein, also comprises a conducting foam, and this conducting foam is arranged between this metallic plate and this housing, and is contacted with this metallic plate and this housing respectively.
Above-mentioned electromagnetic wave shielding device, wherein, include two these metallic plates and be arranged at two these electro-magnetic wave absorption materials of this side of this two metallic plate respectively, this two metallic plate and this two electro-magnetic wave absorption material are arranged at respectively on the two opposite side faces of this circuit board, and the corresponding position that is covered in this district to be measured.
Above-mentioned electromagnetic wave shielding device, wherein, this circuit board has a plurality of fixing holes adjacent to the position in this district to be measured, and this metallic plate has a plurality of perforation of corresponding those fixing holes, wear those perforation and those fixing holes by a plurality of fixtures, and made this metallic plate be fixed on this circuit board.
Above-mentioned electromagnetic wave shielding device, wherein, those fixtures are a bolt, a screw or a latch.
Above-mentioned electromagnetic wave shielding device, wherein, this circuit board has a plurality of fixing holes adjacent to the position in this district to be measured, and this metallic plate has a plurality of reference columns of corresponding those fixing holes, this metallic plate is arranged in those fixing holes by those reference column correspondences, makes this metallic plate be fixed on this circuit board.
Effect of the present invention is, electromagnetic wave shielding device is to post an electro-magnetic wave absorption material on the side of metallic plate, and be covered in the electro-magnetic wave absorption material in the district to be measured of circuit board, to absorb the electromagnetic wave that district to be measured is produced, utilize the break-through of metallic plate barrier to cross the electromagnetic wave of electro-magnetic wave absorption material simultaneously, therefore can be effectively with electro-magnetic wave absorption and be isolated from the district to be measured of circuit board, and can not be passed to other regional electronic component of circuit board.Simultaneously, electromagnetic wave shielding device of the present invention is covered in the district to be measured with the kenel of thin-slab structure, but therefore can not be subjected to the restriction of circuit board usage space.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the perspective exploded view of first embodiment of the invention;
Fig. 2 is the generalized section of first embodiment of the invention;
Fig. 3 is the perspective exploded view that the metallic plate of first embodiment of the invention is fixed with the fixed leg of circuit board;
Fig. 4 is the generalized section that the metallic plate of first embodiment of the invention is fixed with the fixed leg of circuit board;
The perspective exploded view of Fig. 5 district to be measured two opposite side faces for the first embodiment of the invention electromagnetic wave shielding device is arranged at;
The generalized section of Fig. 6 district to be measured two opposite side faces for the first embodiment of the invention electromagnetic wave shielding device is arranged at;
Wherein, Reference numeral
10 circuit boards
110 electronic building bricks
120 districts to be measured
121 test points
130 fixing holes
20 housings
210 screws
30 electromagnetic wave shielding devices
310 metallic plates
311 perforation
312 reference columns
320 electro-magnetic wave absorption materials
321 breach
330 prepregs
331 through holes
340 conducting foams
40 fixtures
Embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are done concrete description:
Electromagnetic wave shielding device of the present invention is in order in the district to be measured that is covered in circuit board, for example in the district to be measured of single face, two-sided or multilayer board, logic card or etched circuit board etc., to absorb and to shield the electromagnetic wave that district to be measured is given out.
As shown in Figures 1 and 2, a circuit board 10 is arranged in the housing 20 of electronic installation, and is locked on the housing 20 with screw 210.Circuit board 10 is provided with a plurality of electronic building bricks 110, for example be chipset, radiator, adapter slot, electric capacity, supply socket etc., district 120 to be measured and an a plurality of fixing hole 130, a plurality of fixing holes 130 are opened on the circuit board 10 position adjacent to district 120 to be measured, and a plurality of test points 121 and produce an electromagnetic wave is arranged of distributing in the district to be measured 120.The disclosed electromagnetic wave shielding device 30 of first embodiment of the invention includes a metallic plate 310 and an electro-magnetic wave absorption material 320, the thickness of this metallic plate 310 is about 0.75 to 1.5 millimeter (mm), and the thickness of electro-magnetic wave absorption material 320 is about 0.4 to 0.6 millimeter, and electro-magnetic wave absorption material 320 is arranged on the side of metallic plate 310.Yet the thickness of metallic plate 310 and electro-magnetic wave absorption material 320 can be complied with actual user demand and corresponding the change, is not limited with the dimensional thickness that present embodiment was disclosed.
Electromagnetic wave shielding device 30 of the present invention is on being installed up to circuit board 10 time, a side that is provided with electro-magnetic wave absorption material 320 with metallic plate 310 is covered in the district 120 to be measured, with the adhesive agent (not shown) electromagnetic wave shielding device 30 is fixed on the circuit board 10 then, or as shown in Figure 1, around metallic plate 310, offer a plurality of perforation 311, and at electro-magnetic wave absorption material 320 a plurality of breach 321 are set, a plurality of perforation 311 and a plurality of breach 321 are all corresponding to the fixing hole 130 around the district 120 to be measured, then by fixture 40, as bolt, latch or screw etc., wore the perforation 311 of metallic plate 310 in regular turn, the breach 321 of electro-magnetic wave absorption material 320 and the fixing hole 130 of circuit board 10 are fixed in electromagnetic wave shielding device 30 in the district 120 to be measured.
Wherein, when if fixture 40 is the form of screw, have a plurality of threads on the screw, and have a plurality of screw threads that the thread with screw is complementary in the fixing hole inner edge of the perforation of metallic plate and circuit board, with the mutual interlock of screw thread by the fixing hole inner edge of the perforation of the thread on the screw and metallic plate and circuit board, screw is attached in perforation and the fixing hole, makes metallic plate and electro-magnetic wave absorption material firmly be arranged on the circuit board; When fixture 40 was the form of bolt, the two ends of bolt had a head and a locking part respectively, and the diameter of head is greater than locking part, and locking part has a plurality of threads, and the internal diameter of the fixing hole of the perforation of the diameter of locking part and metallic plate and circuit board is complementary.In the use, wore the perforation of metallic plate, the breach of electro-magnetic wave absorption material and the fixing hole of circuit board in regular turn with the locking part of bolt, and protrude from a side of the relative housing of circuit board, and then be screwed together in a nut on the thread of bolt locking part, make metallic plate, electro-magnetic wave absorption material and circuit board by clipping between the head and nut of bolt, to increase the fixing intensity of electromagnetic wave shielding device on circuit board; When fixture 40 adopts the form of latch, generally the latch two ends have respectively a head with one can in the elastic flange that contracts, wear the fixing hole of oversampling circuit plate at latch after, elastic flange is sticked on the circuit board thus, metallic plate, electro-magnetic wave absorption material and circuit board are fixed in by clipping between the head and elastic flange of latch, to reach the purpose that electromagnetic wave shielding device is fixed in circuit board.
In disclosed first embodiment of the present invention, be that the form of screw is as illustrating, but not as limit with fixture 40.
Therefore, after by fixture 40 electromagnetic wave shielding device 30 being fixedly arranged on circuit board 10, in the district to be measured 120 of circuit board 10, form electro-magnetic wave absorption material 320 and metallic plate 310 in regular turn, the electromagnetic wave that district 120 to be measured is given out, be subjected to the absorption of electro-magnetic wave absorption material 320 earlier to reduce electromagnetic intensity, and electromagnetic wave is subjected to being arranged on outside stopping of metallic plate 310 and is restricted to district 120 to be measured, the electromagnetic wave that makes district 120 to be measured produce can't be dissipated on the circuit board 10 other electronic building brick 110, as the adapter slot, radiators etc. effectively reduce the electromagnetic interference that the 120 pairs of electronic building bricks 110 in district to be measured produce.
The disclosed electromagnetic wave shielding device of the present invention is except being fixed in fixture the set-up mode of circuit board, also can be as shown in Figure 3 and Figure 4, a plurality of reference columns 312 are extended in a side at metallic plate 310 relative circuit boards 10, and these reference columns 312 to be convexly set in the position of metallic plate 310 corresponding with a plurality of fixing holes 130 of circuit board 10.Therefore, electromagnetic wave shielding device 30 can be worn a plurality of the fixing holes 130 of oversampling circuit plate 10 by a plurality of reference columns 312 correspondences of metallic plate 310, and be fixed in the district to be measured 120 of circuit board 10, this only is fixed in difference on the operation technique of circuit board 10 for electromagnetic wave shielding device 30, is not in order to limit the present invention.
In addition, electromagnetic wave shielding device 30 of the present invention can be arranged on the two opposite side faces of circuit board 10 simultaneously, to promote shielding electromagnetic waves usefulness.As shown in Figure 5 and Figure 6, electromagnetic wave shielding device 30 of the present invention is arranged at respectively on the two opposite side faces of circuit board 10, and it is corresponding with the district to be measured 120 of circuit board 10, two metallic plates 310 are covered in district 120 to be measured with a side that is provided with electro-magnetic wave absorption material 320 respectively, district 120 to be measured is folded between two metallic plates 310, therefore by the absorption of electro-magnetic wave absorption material 320 and the isolation of metallic plate 310, the electromagnetic intensity that district 120 to be measured is produced reduces, can avoid not the electromagnetic wave that absorbed by electro-magnetic wave absorption material 320 to overflow the another side in district 120 to be measured relatively from the circuit board 10, and avoid that other electronic building brick 110 suffers electromagnetic interference and influences its operational effectiveness on the circuit board 10.
In addition, general in the use of electro-magnetic wave absorption material, because the suitable costliness of material cost of electro-magnetic wave absorption material, if a large amount of electromagnetic interference of using the electro-magnetic wave absorption material to prevent circuit board then can make the manufacturing cost of circuit board significantly rise.And if simple use metallic plate as the material of reduction electromagnetic interference, needs just can reach the purpose that reduces electromagnetic interference with the formation of metallic shield usually, therefore in the use of metal material, the doubt of the manufacturing cost of causing rising is arranged equally.Therefore the disclosed electro-magnetic wave absorption material of the present invention not only has the anti-efficient processed of good electromagnetic interference, also has the use amount that reduces electro-magnetic wave absorption material and metallic plate simultaneously, to save the advantage of manufacturing cost.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1. an electromagnetic wave shielding device is covered in the district to be measured of a circuit board, and this circuit board is arranged in the housing, and this of this circuit board district to be measured produces an electromagnetic wave, it is characterized in that this electromagnetic wave shielding device includes:
At least one metallic plate; And
At least one electro-magnetic wave absorption material is arranged on two different sides of this metallic plate;
Wherein, this metallic plate is covered in this district to be measured with the side with this electro-magnetic wave absorption material, and to absorb and to shield this electromagnetic wave, the opposite side electromagnetic wave absorbent material is used for placing the electromagnetic interference of environment.
2. electromagnetic wave shielding device according to claim 1 is characterized in that, also comprises a prepreg, and this prepreg is arranged on the side of this electro-magnetic wave absorption material with respect to this district to be measured.
3. electromagnetic wave shielding device according to claim 1 is characterized in that, also comprises a conducting foam, and this conducting foam is arranged between this metallic plate and this housing, and is contacted with this metallic plate and this housing respectively.
4. electromagnetic wave shielding device according to claim 1, it is characterized in that, include two these metallic plates and be arranged at two these electro-magnetic wave absorption materials of this side of this two metallic plate respectively, this two metallic plate and this two electro-magnetic wave absorption material are arranged at respectively on the two opposite side faces of this circuit board, and the corresponding position that is covered in this district to be measured.
5. electromagnetic wave shielding device according to claim 1, it is characterized in that, this circuit board has a plurality of fixing holes adjacent to the position in this district to be measured, this metallic plate has a plurality of perforation of corresponding those fixing holes, wear those perforation and those fixing holes by a plurality of fixtures, and made this metallic plate be fixed on this circuit board.
6. electromagnetic wave shielding device according to claim 5 is characterized in that, those fixtures are a bolt, a screw or a latch.
7. electromagnetic wave shielding device according to claim 1, it is characterized in that, this circuit board has a plurality of fixing holes adjacent to the position in this district to be measured, this metallic plate has a plurality of reference columns of corresponding those fixing holes, this metallic plate is arranged in those fixing holes by those reference column correspondences, makes this metallic plate be fixed on this circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105957621A CN103260387A (en) | 2012-12-17 | 2012-12-17 | Electromagnetic wave shielding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105957621A CN103260387A (en) | 2012-12-17 | 2012-12-17 | Electromagnetic wave shielding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103260387A true CN103260387A (en) | 2013-08-21 |
Family
ID=48963993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105957621A Pending CN103260387A (en) | 2012-12-17 | 2012-12-17 | Electromagnetic wave shielding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103260387A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249456A (en) * | 2015-06-08 | 2016-12-21 | 株式会社日本显示器 | Fixed structure and fixing means |
| CN111917433A (en) * | 2020-06-22 | 2020-11-10 | 安徽派斯客网络科技有限公司 | Communication terminal |
-
2012
- 2012-12-17 CN CN2012105957621A patent/CN103260387A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249456A (en) * | 2015-06-08 | 2016-12-21 | 株式会社日本显示器 | Fixed structure and fixing means |
| CN106249456B (en) * | 2015-06-08 | 2019-11-19 | 株式会社日本显示器 | Fixed structure and fixing means |
| CN111917433A (en) * | 2020-06-22 | 2020-11-10 | 安徽派斯客网络科技有限公司 | Communication terminal |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130821 |