CN201479456U - Electromagnetic wave shielding device - Google Patents
Electromagnetic wave shielding device Download PDFInfo
- Publication number
- CN201479456U CN201479456U CN200920154572XU CN200920154572U CN201479456U CN 201479456 U CN201479456 U CN 201479456U CN 200920154572X U CN200920154572X U CN 200920154572XU CN 200920154572 U CN200920154572 U CN 200920154572U CN 201479456 U CN201479456 U CN 201479456U
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- circuit board
- test point
- metallic plate
- shielding device
- electro
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Abstract
An electromagnetic wave shielding device is provided with at least one metal plate, and one side of the metal plate is provided with electromagnetic wave absorbing materials. The side of the metal plate provided with the electromagnetic wave absorbing materials is covered on a test point area of a circuit board so as to absorb and shield electromagnetic wave generated by the test point area, and electromagnetic wave penetrates through the electromagnetic wave absorbing materials can be blocked by the metal plate, and then electromagnetic wave can be effectively absorbed and isolated from the test point area of the circuit board but can not be transmitted to the circuit board and other electronic parts in other areas. Simultaneously, the electromagnetic wave shielding device which is covered on the test point area in a sheet structure form can not be limited by enable space of the circuit board.
Description
Technical field
The utility model is relevant for a kind of masking device, and particularly a kind of electromagnetic shielding device is covered on the test point zone 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, 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 usually in order to purposes as the test electrical functionality.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, being provided with the ground plane; usually can lay the ground connection Copper Foil in the test point zone and increase contact area; reducing electromagnetic interference by the impedance of dwindling some grounded circuit, or in the test point zone metallic shield being set reduces electromagnetic interference.But, and can't provide enough electromagnetic interference screening effects often because the electromagnetic shielding of Copper Foil is limited in one's ability.Though the electromagnetic shielding ability of metallic shield is better than Copper Foil, precisely because occupy certain volume in the use, and can be quite limited on the circuit board for the space of its setting, 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 test point zone, still in the use restriction of seeking to overcome circuit board space, and can improve the electromagnetic interference masking methods of screening ability simultaneously.
The utility model content
In view of above problem, the utility model provides a kind of electromagnetic shielding device, existing prevent or reduces in the method for electromagnetic interference to improve, and is limited for the screening effect of electromagnetic interference, and is subject to the problem of circuit board usage space.
To achieve these goals, the utility model discloses a kind of electromagnetic shielding device, on the test point zone that is covered in circuit board, this circuit board is arranged in the housing, and this test point zone produces electromagnetic wave, it is characterized in that this electromagnetic shielding device includes:
At least one metallic plate; And
At least one electro-magnetic wave absorption material is arranged on the side of this metallic plate;
Wherein, this metallic plate is covered on this test point zone with the side with this electro-magnetic wave absorption material, to absorb and to cover this electromagnetic wave.
Above-mentioned electromagnetic 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 test point zone.
Above-mentioned electromagnetic 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 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 test point zone.
Above-mentioned electromagnetic shielding device, wherein, this circuit board has a plurality of fixing holes adjacent to the position in this test point zone, 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 shielding device, wherein, those fixtures are a bolt, a screw or a latch.
Above-mentioned electromagnetic shielding device, wherein, this circuit board has a plurality of fixing holes adjacent to the position in this test point zone, 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 utility model is, the electromagnetic 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 on the test point zone of circuit board, to absorb the electromagnetic wave that the test point zone 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 test point zone of circuit board, and can not be passed to other regional electronic component of circuit board.Simultaneously, electromagnetic shielding device of the present utility model is covered on the test point zone with the kenel of thin-slab structure, but therefore can not be subjected to the restriction of circuit board usage space.
Below in conjunction with the drawings and specific embodiments the utility model is described in detail, but not as to qualification of the present utility model.
Description of drawings
Fig. 1 is the perspective exploded view of the utility model first embodiment;
Fig. 2 is the generalized section of the utility model first embodiment;
Fig. 3 is the perspective exploded view that the metallic plate of the utility model first embodiment is fixed with the fixed leg of circuit board;
Fig. 4 is the generalized section that the metallic plate of the utility model first embodiment is fixed with the fixed leg of circuit board;
Fig. 5 is arranged at the perspective exploded view of test point zone two opposite side faces for the utility model first embodiment electromagnetic shielding device;
Fig. 6 is arranged at the generalized section of test point zone two opposite side faces for the utility model first embodiment electromagnetic shielding device;
Fig. 7 is the perspective exploded view of the utility model second embodiment;
Fig. 8 is the generalized section of the utility model second embodiment;
Fig. 9 is the perspective exploded view of the utility model the 3rd embodiment; And
Figure 10 is the generalized section of the utility model the 3rd embodiment.
Wherein, Reference numeral
10 circuit boards
110 electronic building bricks
120 test point zones
121 test points
130 fixing holes
20 housings
210 screws
30 electromagnetic 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 utility model and operation principle are done concrete description:
Electromagnetic shielding device of the present utility model is in order on the test point zone that is covered in circuit board, for example on the test point zone of single face, two-sided or multilayer board, logic card or etched circuit board etc., to absorb and to cover the electromagnetic wave that the test point zone 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., test point zone 120 and a plurality of fixing hole 130, a plurality of fixing holes 130 are opened on the circuit board 10 position adjacent to test point zone 120, and a plurality of test points 121 and produce an electromagnetic wave is arranged of distributing on the test point zone 120.The disclosed electromagnetic shielding device 30 of the utility model first embodiment 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, does not exceed with the dimensional thickness that present embodiment was disclosed.
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 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 shielding device on circuit board; When fixture 40 adopts the form of latch, generally the latch two ends have respectively a head and 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 the electromagnetic shielding device is fixed in circuit board.
In disclosed first embodiment of the utility model, the form that with fixture 40 is screw is as illustrating, but not as limit.
Therefore, after electromagnetic shielding device 30 being fixedly arranged on circuit board 10 by fixture 40, on the test point zone 120 of circuit board 10, form electro-magnetic wave absorption material 320 and metallic plate 310 in regular turn, the electromagnetic wave that test point zone 120 is given out, the absorption that is subjected to electro-magnetic wave absorption material 320 earlier is to reduce electromagnetic intensity, and electromagnetic wave is subjected to being arranged on outside stopping of metallic plate 310 and is restricted to test point zone 120, the electromagnetic wave that makes test point zone 120 be produced can't be dissipated on the circuit board 10 other electronic building brick 110, as the adapter slot, radiators etc. effectively reduce the 120 pairs of electromagnetic interference that electronic building brick 110 is produced in test point zone.
The disclosed electromagnetic shielding device of the utility model is except being fixed in fixture the set-up mode of circuit board, also can be as shown in Figure 3 and Figure 4, on a side of metallic plate 310 relative circuit boards 10, extend a plurality of reference columns 312, 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 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 on the test point zone 120 of circuit board 10, this only is fixed in difference on the operation technique of circuit board 10 for electromagnetic shielding device 30, is not in order to restriction the utility model.
In addition, electromagnetic shielding device 30 of the present utility model can be arranged on the two opposite side faces of circuit board 10, to promote electromagnetic shielding efficiency simultaneously.As shown in Figure 5 and Figure 6, electromagnetic shielding device 30 of the present utility model is arranged at respectively on the two opposite side faces of circuit board 10, and it is corresponding with the test point zone 120 of circuit board 10, two metallic plates 310 are covered in test point zone 120 with a side that is provided with electro-magnetic wave absorption material 320 respectively, test point zone 120 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 test point zone 120 is produced reduces, can avoid not the electromagnetic wave that absorbed by electro-magnetic wave absorption material 320 from the circuit board 10 relatively the another side in test point zone 120 overflow, and avoid that other electronic building brick 110 suffers electromagnetic interference and influences its operational effectiveness on the circuit board 10.
As shown in Figures 7 and 8, 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, test point zone 120 and a plurality of fixing hole 130, a plurality of fixing holes 130 are opened on the circuit board 10 position adjacent to test point zone 120, and a plurality of test points 121 and produce an electromagnetic wave is arranged of distributing on the test point zone 120.The disclosed electromagnetic shielding device 30 of the utility model second embodiment includes a metallic plate 310, an one electro-magnetic wave absorption material 320 and a prepreg (mylar) 330, the thickness of metallic plate 310 is about 0.75 to 1.5 millimeter (mm), offer a plurality of perforation 311 on the metallic plate 310, the position of perforation 311 is corresponding to the position of the fixing hole 130 of circuit board 10, electro-magnetic wave absorption material 320 is arranged between metallic plate 310 and the prepreg 330, 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 provided with the breach 321 of corresponding metallic plate 310 perforation, and the thickness of prepreg 330 is about 0.2 to 0.3 millimeter, and prepreg 330 also offers the through hole 331 corresponding to metallic plate 310 perforation 311.Yet, metallic plate 310, electro-magnetic wave absorption material 320, and the thickness of prepreg 330 can be according to actual user demand and corresponding the change do not exceeded with the dimensional thickness that present embodiment was disclosed.
The disclosed electromagnetic shielding device 30 of the utility model second embodiment is on being installed up to circuit board 10 time, be covered in the test point zone 120 of circuit board 10 with a side that is provided with prepreg 330, and on test point zone 120, form prepreg 330 in regular turn, electro-magnetic wave absorption material 320 and metallic plate 310, wore the perforation 311 of metallic plate 310 at last in regular turn with fixture 40, the breach 321 of electro-magnetic wave absorption material 320, the through hole 331 of prepreg 320 and the fixing hole 130 of circuit board 10 are fixed on the test point zone 120 of circuit board 10 electromagnetic shielding device 30.With by the circuit layout (not shown) in the prepreg 330 insulation blocking test points zone 120; and provide the excellent electrical property insulating effect; absorb the electromagnetic wave that test point zone 120 is produced via electro-magnetic wave absorption material 320 then; and make electromagnetic wave be subjected to stopping of sheet metal 310, and the electromagnetic interference that the electromagnetic wave that reduction test point zone 120 is produced is produced other regional electronic building brick 110 on the circuit board 10.
Seeing also Fig. 9 decomposes with the solid that Figure 10 shows that the utility model the 3rd embodiment and the combination generalized section.The disclosed electromagnetic shielding device of the utility model the 3rd embodiment is in order on the test point zone that is covered in circuit board, with the electromagnetic intensity of isolating and reduction test point zone is distributed, circuit board 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, test point zone 120 and a plurality of fixing hole 130, a plurality of fixing holes 130 are opened on the circuit board 10 position adjacent to test point zone 120, and a plurality of test points 121 and produce an electromagnetic wave is arranged of distributing on the test point zone 120.
Therefore; circuit layout (not shown) in the test point zone 120 of circuit board 10 can be subjected to the insulation blocking of prepreg 330 and the protection effect of insulation is provided; and absorb the electromagnetic wave that test point zones 120 are produced by electro-magnetic wave absorption material 320; and utilize metallic plate 310 to isolate and stop these electromagnetic waves, make electromagnetic wave can't be passed to other zone beyond the test point zone 120 on the circuit board 10.Simultaneously, cooperate the use of conducting foam 340, make electromagnetic wave be subjected to lead and let out in housing 20 via conducting foam 340, therefore the electromagnetic interference that the test point zone is produced the harm of the electronic building brick on the circuit board 10 110 is reduced to minimum, to meet the legal safety standard value of various countries for electromagnetic interference.
The disclosed electromagnetic shielding device of the utility model includes sheet metal and electro-magnetic wave absorption material, be covered in the test point zone of circuit board by the electro-magnetic wave absorption material, the electromagnetic wave that the test point zone is produced is subjected to the absorption of electro-magnetic wave absorption material earlier, allow after the electromagnetic strength reduction, by metallic plate electromagnetic wave is barred from the test point zone again, the electromagnetic wave that allows the test point zone be produced can't be passed to other zone on the circuit board, therefore effectively reduces the electromagnetic interference that electronic building brick caused of test point zone for circuit board.And, because the disclosed electromagnetic shielding device of the utility model adopts the set-up mode of thin plate dress, when being installed in circuit board, fit on the circuit board, be arranged at the electronic building brick on the circuit board and the restriction that is subjected to usage space but can't interfere with other.
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, therefore in the use of metal material, the doubt of the manufacturing cost of causing rising is arranged equally 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 the disclosed electro-magnetic wave absorption material of the utility model not only has the anti-system of good electromagnetic interference efficient, 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 utility model also can have other various embodiments; under the situation that does not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (7)
1. an electromagnetic shielding device is covered on the test point zone of a circuit board, and this circuit board is arranged in the housing, and this test point zone of this circuit board produces an electromagnetic wave, it is characterized in that this electromagnetic shielding device includes:
At least one metallic plate; And
At least one electro-magnetic wave absorption material is arranged on the side of this metallic plate;
Wherein, this metallic plate is covered on this test point zone with the side with this electro-magnetic wave absorption material, to absorb and to cover this electromagnetic wave.
2. electromagnetic 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 test point zone.
3. electromagnetic 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 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 test point zone.
5. electromagnetic 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 test point zone, 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 shielding device according to claim 5 is characterized in that, those fixtures are a bolt, a screw or a latch.
7. electromagnetic 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 test point zone, 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 |
|---|---|---|---|
| CN200920154572XU CN201479456U (en) | 2009-05-22 | 2009-05-22 | Electromagnetic wave shielding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920154572XU CN201479456U (en) | 2009-05-22 | 2009-05-22 | Electromagnetic wave shielding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201479456U true CN201479456U (en) | 2010-05-19 |
Family
ID=42415711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920154572XU Expired - Fee Related CN201479456U (en) | 2009-05-22 | 2009-05-22 | Electromagnetic wave shielding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201479456U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749456A (en) * | 2013-12-31 | 2015-07-01 | 深圳麦逊电子有限公司 | PCB test jig having electromagnetic shielding function and manufacturing method thereof |
| WO2017152458A1 (en) * | 2016-03-09 | 2017-09-14 | 深圳市华星光电技术有限公司 | Pcb fixation structure and liquid crystal display apparatus |
-
2009
- 2009-05-22 CN CN200920154572XU patent/CN201479456U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749456A (en) * | 2013-12-31 | 2015-07-01 | 深圳麦逊电子有限公司 | PCB test jig having electromagnetic shielding function and manufacturing method thereof |
| WO2017152458A1 (en) * | 2016-03-09 | 2017-09-14 | 深圳市华星光电技术有限公司 | Pcb fixation structure and liquid crystal display apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20160522 |