CN1276700C - Electromagnetic interference masking method and shading device and printing circuit board - Google Patents
Electromagnetic interference masking method and shading device and printing circuit board Download PDFInfo
- Publication number
- CN1276700C CN1276700C CN 200410058234 CN200410058234A CN1276700C CN 1276700 C CN1276700 C CN 1276700C CN 200410058234 CN200410058234 CN 200410058234 CN 200410058234 A CN200410058234 A CN 200410058234A CN 1276700 C CN1276700 C CN 1276700C
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- circuit board
- masking device
- printed circuit
- pcb
- extension
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Abstract
The present invention relates to an electromagnetic interference blocking method, a shielding device and a printed circuit board. A shielding region is set aiming at the range in which the phenomenon of outward diffusion of electromagnetic wave in electronic elements on the front and the back surfaces of the printed circuit board and circuit layout can be generated; a first shielding device covers the shielding region, and the bottom of the first shielding device is welded and fixed on the surface of the front surface of the printed circuit board; the position symmetrical to the surface on the back surface of the circuit board of the shielding region is provided with a second shielding device which can completely cover the shielding region; a region limited by ceiling within the range of the shielding region is defined to a ceiling region; the second shielding device has a hollow cover body and at least one extending part, wherein the circumference of the cover body has side walls; the extending part is formed by the extending of the external of the side walls at the circumference of the cover body, and the extending part can be completely stuck and covered on the surface of the printed circuit board in the ceiling region in a flat mode. Then, the bottom of the second shielding device is welded and fixed to the surface of the back surface of the printed circuit board in a welding fixing mode in order to attain the effect of shielding the electromagnetic wave.
Description
Technical field
The present invention relates to a kind of electromagnetic interference blocking method, masking device and printed circuit board (PCB), refer to especially a kind of can be in order to the masking device in the Electromagnetic Interference source on the screened circuit plate and method and corresponding printed circuit board (PCB).
Background technology
Along with industrial technology constantly progresses greatly, making the wireless communication electronics product can little by little popularize in popular uses, and the wireless communication electronics product is also little towards volume, function is high, the reception effect is good and develop, but because the wireless communication electronics product is when running, the electronic component that has the high workload frequency on its inner transfer wire, power supply or the circuit board all can externally exhale electromagnetic wave, produce noise and can make other device can be subjected to this electromagnetic interference, and then the normal work running of influence.
For actively avoiding Electromagnetic Interference effectively, traditionally usually at zones such as the circuit of the interference source that can generate electromagnetic waves on the circuit board and electronic components, directly be covered on this zone with metal mask with conductivity, the metal mask is fixed on the circuit board surface by assembling or welding manner, and be one and electrically conduct with earth terminal on the circuit board, the Electromagnetic Interference source is sealed in the metal mask, make its electromagnetic wave that produces can covering and be directed to earth terminal via the metal mask, unlikely the overflowing of the electromagnetic wave that the Electromagnetic Interference source is produced exposed metal mask outside, and has influence on the running of other electron component; But, aforementioned mode of covering only can be directed to the single lip-deep Electromagnetic Interference of circuit board source and produce the effect of covering and isolating, but because the higher Electromagnetic Interference source of a few thing frequency is when running, the electromagnetic wave that it produced even can penetrate circuit board and give off circuit board back surfaces place, and produce interference for electronic component set on the circuit board back surfaces, therefore best at present settling mode, it is the electromagnetic interference source position on circuit board, setting is to be two metal masks of symmetry, cover respectively on the relative position surface of circuit board positive and negative, can reach the electromagnetic wave that to be produced and be sealed in fully between the two metal masks.
Yet; aforementioned on circuit board the tow sides place establish mode with the electromagnetic wave shielding of symmetrical two metal masks; though really can reach electromagnetic wave is intercepted within the metal mask; and can avoid it to penetrate circuit board and give off the external world; but because the internal body space of electronic product is limited; therefore when assembling, often need consider the assembly space and the limit for height problem of inner member; usually understand some to be subjected to stopping of inner member between two metal masks and limit for height restriction is arranged; can't be simultaneously in symmetrically arranged mode; be covered in corresponding tow sides place on the circuit board; therefore tend to cause required isolation enclosed areas can't reach closure and produce leak, make it to desire to reach the isolating electromagnetic effects of jamming and have a greatly reduced quality.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of electromagnetic interference blocking method and masking device and printed circuit board (PCB) are provided, can reach and intercept Electromagnetic Interference fully, and can avoid being subjected to the influence of electronic installation inner space limit for height restriction.
Another technical problem that the present invention will solve is: a kind of electromagnetic interference blocking method and masking device and printed circuit board (PCB) are provided, can reach and prevent that electromagnetic wave is radiated to the external world after penetrating circuit board, and then interfere with the shortcoming of the set electronic component running of circuit board reverse side.
Technical solution of the present invention is: a kind of masking device, in order to be covered on the printed circuit board (PCB), use and cover and prevent electromagnetic outer loosing, to avoid producing electromagnetic interference, it mainly includes: one is the hollow lid, made by the sheet metal with conductivity, the periphery setting respectively has a sidewall around the lid; And at least one extension, this extension is stretched out by the sidewall of this lid periphery and is provided with; After masking device is covered on the printed circuit board surface, can be by the smooth zone that has the restriction of part limit for height on the printed circuit board surface that is covered in of this extension, and a separator with effect of isolated conduction is set between this extension and printed circuit board surface in addition, uses the effect that reaches electromagnetic wave shielding.
A kind of electromagnetic interference blocking method of the corresponding proposition of the present invention, it mainly has following steps:
A. set a shaded areas at the scope of loosing outside in the middle of positive and negative lip-deep electronic component of a printed circuit board (PCB) and circuit layout, can generating electromagnetic waves;
B., one first masking device is provided, and is the lid by the made hollow of the sheet metal with conductivity, is arranged on this circuit board surface with limit for height restriction, is covered in this shaded areas;
C. in symmetrical circuit board reverse side surface one second masking device is set then in this shaded areas, can be covered in this shaded areas fully, this second masking device is useful in this printed circuit board surface with limit for height restriction, the zone that is subjected to the limit for height restriction in this shaded areas scope need be defined a height limiting zone earlier, and a separator with isolated conductive effect is set on the printed circuit board surface of this height limiting zone, this second masking device has a lid and an at least one extension that is hollow respectively, wherein be provided with sidewall around this lid, this extension is to be extended and be provided with by the outside institute of the sidewall of lid periphery, and this extension can the smooth fully printed circuit board surface that is covered in this height limiting zone.
A kind of printing-circuit board module of the last proposition of the present invention with masking device, it mainly includes: a printed circuit board (PCB), for scope definition one shaded areas of loosing outside can generating electromagnetic waves in electronic component on this printed circuit board (PCB) and the circuit layout, in addition part has region deviding one height limiting zone of maximum height limit in this shaded areas scope, and is provided with a separator with isolated conductive effect on the printed circuit board surface of this height limiting zone; And one second masking device, this masking device can be covered in this shaded areas scope fully, have a lid and an at least one extension that is hollow respectively, wherein this lid periphery respectively is provided with sidewall, this extension is then extended by the outside institute of sidewall and is provided with, make this extension to cover after on the printed circuit board surface in this masking device, simultaneously can the smooth fully printed circuit board surface that is covered in this height limiting zone.
Characteristics of the present invention and advantage are: the present invention mainly is that the scope of loosing outside can generating electromagnetic waves in the middle of positive and negative lip-deep electronic component of a printed circuit board (PCB) and circuit layout is set a shaded areas; On the shaded areas that one first masking device is set, covers circuit board surface, and be welded in the bottom of first masking device on the surface in printed circuit board (PCB) front in the solid welding mode with limit for height restriction; Then be provided with one second masking device in symmetrical circuit board reverse side surface in this shaded areas, can be covered in this shaded areas fully, a height limiting zone is then defined in the zone that is subjected to the limit for height restriction in this shaded areas scope, this second masking device has a lid and an at least one extension that is hollow, wherein be provided with sidewall around this lid, this extension is extended by the outside institute of the sidewall of lid periphery and is provided with, this extension can the smooth fully printed circuit board surface that is covered in this height limiting zone, bottom with second masking device is welded on the surface of printed circuit board (PCB) reverse side in the solid welding mode again, thereby overcome the defective of prior art, not only can reach and intercept Electromagnetic Interference fully, and can avoid being subjected to the influence of electronic installation inner space limit for height restriction, reach and prevent that electromagnetic wave is radiated to the external world after penetrating circuit board, and then avoid interference the set electronic component of circuit board reverse side.
Description of drawings
Stereochemical structure decomposing schematic representation when Fig. 1 is installed on the printed circuit board (PCB) for the present invention.
Stereochemical structure when Fig. 2 is installed on the printed circuit board (PCB) for the present invention is decomposed the other direction schematic diagram.
Fig. 2 A is the perspective view of second masking device of the present invention.
Fig. 3 is the solid combination schematic diagram of the present invention after being installed on the printed circuit board (PCB).
Fig. 4 is the side-looking cross section view of the present invention after being installed on the printed circuit board (PCB).
The drawing reference numeral explanation:
10, printed circuit board (PCB) 12, shaded areas 14, height limiting zone
16, separator 20, first masking device 30, second masking device
32, lid 322, sidewall 34, extension
Embodiment
For further understanding structure of the present invention, feature and effect thereof, describe in detail as the back with accompanying drawing and preferred embodiment now:
See also Figure 1 and Figure 2, be respectively stereochemical structure decomposing schematic representation and the other direction schematic diagram of the present invention when being installed on the printed circuit board (PCB).As shown in the figure, electromagnetic interference blocking method of the present invention, be primarily aimed at required part of covering on the printed circuit board (PCB), respectively by sentencing the method that symmetric mode covers simultaneously from the tow sides of printed circuit board (PCB), its method includes following step: at first, set a shaded areas 12 at the scope of loosing outside can generating electromagnetic waves in the middle of a printed circuit board (PCB) 10 positive and negative lip-deep electronic components and circuit layout; One first masking device 20 is set, it is lid by the made hollow of the sheet metal with conductivity, can be arranged on printed circuit board (PCB) 10 surfaces with limit for height restriction, be covered in this shaded areas 12, and be fixed in printed circuit board (PCB) 10 surfaces with welding manner, and be covered in this shaded areas 12 in it fully in first masking device, 20 bottoms; Then be provided with second a made masking device 30 of sheet metal that has conductivity equally in symmetrical printed circuit board (PCB) 10 reverse side surfaces in this shaded areas 12, can be covered in this shaded areas 12 fully, this second masking device 30 is useful in printed circuit board (PCB) 10 surfaces with the restriction of part limit for height, the zone that wherein is subjected to the limit for height restriction in these shaded areas 12 scopes need be defined a height limiting zone 14 earlier, and printed circuit board (PCB) 10 surfaces of this height limiting zone 14 are provided with a separator 16, please consult Fig. 3 and shown in Figure 4 simultaneously, this separator 16 need have the effect of isolated conduction, electrically conducts to prevent circuit and 30 generations of second masking device on the printed circuit board (PCB) 10.This second masking device 30 has a lid 32 and an at least one extension 34 that is hollow respectively, wherein be provided with a plurality of sidewalls 322 around this lid 32, this extension 34 is extended by a wherein sidewall 322 outside institutes of lid 32 peripheries and is provided with, and by these extension 34 complete smooth this separator 16 surfaces that are covered in; Bottom with this second masking device 30 is welded on the surface of printed circuit board (PCB) 10 reverse side in the solid welding mode at last, and this first masking device 20 and second masking device 30 must be a conducting with set earth point (not shown) on the printed circuit board (PCB) 10 simultaneously; So can make the electromagnetic wave that is produced on the printed circuit board (PCB) 10, tow sides via printed circuit board (PCB) 10 are covered respectively to be symmetrical first masking device 20 and second masking device 30 in same shaded areas 12 respectively, use to reach preventing that electromagnetic wave can be via penetrating printed circuit board (PCB) 10 to external radiation, and influence the possibility of other electron component running.
The present invention avoids electronic component on the printed circuit board (PCB) or circuit to generate electromagnetic waves when running to influence the work running of disturbing other electron component to external radiation, mainly be respectively to be provided with corresponding mutually first masking device 20 and second masking device 30 at printed circuit board (PCB) 10 tow sides, so that will desire the shaded areas 12 that electromagnetic wave shielding is dispersed on the printed circuit board (PCB) 10, give simultaneously shaded areas 12 is hidden via printed circuit board (PCB) 10 positive and negative two surfaces, penetrate the possibility that printed circuit board (PCB) 10 is dispersed again to prevent that electromagnetic wave from having, in addition has a maximum height limit for considering that the electronic installation inner space is limited, when assembling design, need consider the height that is provided with of first masking device 20 and second masking device 30, so, this second masking device 30 is processed into by the sheet metal with conductivity, see also shown in Fig. 2 A, and it has a lid 32 and at least one extension 34 respectively, this extension 34 is directly extended in the bending process mode by sidewall 322 outsides of these lid 32 peripheries, make when lid 32 is covered on the surface of printed circuit board (PCB) 10, this extension 32 just can smoothly cover in the surface of this printed circuit board (PCB) 10, and need there be any electronic component institute layout printed circuit board (PCB) 10 surfaces that this extension 32 is desired to cover, and this extension 34 still can directly constitute via sidewall 322 outsides that are welded in lid 32 peripheries by another sheet metal certainly; If this second masking device 30 mainly is when printed circuit board (PCB) 10 surfaces of institute's desire setting upward have been subjected to the limit for height restriction, can be by the setting of this extension 34 with in the standard that meets original maximum height limit, make the shaded areas 12 that is subjected to the limit for height restriction on the printed circuit board (PCB) 10, still can obtain covering by the extension of extension 34, and reach the effect of electromagnetic wave shielding, printed circuit board (PCB) 10 surfaces that are positioned at 10 of this extension 34 and printed circuit board (PCB)s need to be provided with a separator 16, when contacting with printed circuit board (PCB) 10 surfaces with the extension 34 of avoiding having conductivity, the cabling on printed circuit board (PCB) 10 surfaces is affected and causes situation of short circuit, this separator 16 is made of in advance the former character layer paint vehicle that has of printed circuit board (PCB) 10 top layer layouts in the present embodiment, yet, be coated with by the paint vehicle of tool isolate conductive effect in addition and the mode that constitutes is also applicable.
By above stated specification as can be known, the present invention mainly is the layout state according to the circuit of printed circuit board (PCB) 10, define in advance on the printed circuit board (PCB) 10 positive and negative surfaces after the required shaded areas of covering 12, when shaded areas 12 residing printed circuit board (PCB)s 10 surfaces are not subjected to the problem of limit for height restriction, covering is provided with by positive and negative two surfaces of the printed circuit board (PCB) 10 of shaded areas 12 positions are corresponding can directly to be the first symmetrical masking device 20 by two, reaches the purpose of electromagnetic wave shielding; But when the shaded areas 12 of institute's desire setting runs into the situation that the limit for height restriction is arranged, then can will there be printed circuit board (PCB) 10 surfaces at overlaid place to establish with height limiting zone on the desire shaded areas 12, cover in shaded areas 12 by this second masking device 30 again and get final product with behind the separator 16; So utilization the present invention can use the limit for height restriction of required consideration when on the original printed circuit board (PCB) 10 of smooth avoidance masking device being set, and still can reach institute's desire shaded areas 12 is covered fully, prevents the possibility that electromagnetic wave looses outward.And separator 16 can utilize the former character layer formation that paint vehicle is reserved that has of printed circuit board (PCB) 10 top layer layouts, applies and need not additionally be coated with, so can simplify its processing procedure as far as possible.And the present invention be by forming a printing-circuit board module with isolating electromagnetic effect by arbitrary or wantonly two groups of masking devices in printed circuit board (PCB) 10 and first masking device 20 or second masking device 30, makes this kind printing-circuit board module avoid applicable to any needs and prevents that the electronic installation of Electromagnetic Interference from using.
The above person of thought, it only is a preferred embodiment of the present invention, be not to be used for limiting scope of the invention process, the equalization of doing according to the described shape of the present patent application claim, structure, feature and spirit changes and modifies such as, all should be included in the claim of the present invention.
Claims (22)
1, a kind of masking device covers and prevents electromagnetic outer loosing in order to be covered on the printed circuit board (PCB), to use, and, it is characterized in that this masking device includes to avoid producing electromagnetic interference:
One is the hollow lid, made by the sheet metal with conductivity, and periphery respectively is provided with a sidewall around the lid; And
One or more extension, this extension is extended outward and is provided with by the sidewall of this lid periphery;
After masking device is covered on the printed circuit board surface, can be by the smooth zone that has the restriction of part limit for height on the printed circuit board surface that is covered in of this extension, and a separator with effect of isolated conduction is set between this extension and printed circuit board surface in addition, uses the effect that reaches electromagnetic wave shielding.
2, masking device as claimed in claim 1 is characterized in that, this extension is that direct sidewall by the lid periphery is shaped in the bending process mode.
3, masking device as claimed in claim 1 is characterized in that, this extension is directly to be made of via the sidewall outside that is welded in the lid periphery a sheet metal.
4, masking device as claimed in claim 1 is characterized in that, this separator is made of the former character layer paint vehicle that has of circuit board top layer layout.
5, masking device as claimed in claim 1 is characterized in that, this separator is that the paint vehicle by tool isolate conductive effect is coated with and constitutes.
6, a kind of electromagnetic interference blocking method, it has following steps:
A. set a shaded areas at the scope of loosing outside in the middle of positive and negative lip-deep electronic component of a printed circuit board (PCB) and circuit layout, can generating electromagnetic waves;
B., one first masking device is provided, and is the lid by the made hollow of the sheet metal with conductivity, is arranged on this circuit board surface with limit for height restriction, is covered in this shaded areas;
C. in symmetrical circuit board reverse side surface one second masking device is set then in this shaded areas, can be covered in this shaded areas fully, this second masking device is useful in this printed circuit board surface with limit for height restriction, the zone that is subjected to the limit for height restriction in this shaded areas scope need be defined a height limiting zone earlier, and a separator with isolated conductive effect is set on the printed circuit board surface of this height limiting zone, this second masking device has a lid and an one or more extension that is hollow respectively, wherein be provided with sidewall around this lid, this extension is to be extended and be provided with by the outside institute of the sidewall of lid periphery, and this extension can the smooth fully printed circuit board surface that is covered in this height limiting zone.
7, electromagnetic interference blocking method as claimed in claim 6 is characterized in that, this separator is made of the former character layer paint vehicle that has of circuit board top layer layout.
8, electromagnetic interference blocking method as claimed in claim 6 is characterized in that, this separator is that the paint vehicle by tool isolate conductive effect is coated with and constitutes.
9, electromagnetic interference blocking method as claimed in claim 6 is characterized in that, this first masking device and second masking device simultaneously with printed circuit board (PCB) on set earth point be a conducting.
10, electromagnetic interference blocking method as claimed in claim 6 is characterized in that, the bottom of this first masking device is to be welded on the surface in printed circuit board (PCB) front in the solid welding mode.
11, electromagnetic interference blocking method as claimed in claim 6 is characterized in that, the bottom of this second masking device is to be welded on the surface of printed circuit board (PCB) reverse side in the solid welding mode.
12, a kind of printing-circuit board module with masking device is characterized in that it includes:
One printed circuit board (PCB), for scope definition one shaded areas of loosing outside can generating electromagnetic waves in electronic component on this printed circuit board (PCB) and the circuit layout, in addition part has region deviding one height limiting zone of maximum height limit in this shaded areas scope, and is provided with a separator with isolated conductive effect on the printed circuit board surface of this height limiting zone; And
One second masking device, this masking device can be covered in this shaded areas scope fully, have a lid and an one or more extension that is hollow respectively, wherein this lid periphery respectively is provided with sidewall, this extension is then extended by the outside institute of sidewall and is provided with, make this extension to cover after on the printed circuit board surface in this masking device, simultaneously can the smooth fully printed circuit board surface that is covered in this height limiting zone.
13, the printing-circuit board module with masking device as claimed in claim 12, it is characterized in that, be positioned at this printed circuit board (PCB) reverse side and symmetrical surface in this shaded areas scope is provided with one first masking device, this first masking device is the made hollow lid of sheet metal with conductivity.
14, the printing-circuit board module with masking device as claimed in claim 12 is characterized in that, is positioned at this printed circuit board (PCB) reverse side and symmetrical surface in this shaded areas scope is provided with the second identical masking device.
As claim 12 or 14 described printing-circuit board modules, it is characterized in that 15, this extension is that direct sidewall by the lid periphery is shaped in the bending process mode with masking device.
16, as claim 12 or 14 described printing-circuit board modules with masking device, wherein this extension is directly to be made of via the sidewall outside that is welded in the lid periphery a sheet metal.
As claim 12 or 14 described printing-circuit board modules, it is characterized in that 17, this separator is made of the former character layer paint vehicle that has of circuit board top layer layout with masking device.
As claim 12 or 14 described printing-circuit board modules, it is characterized in that 18, this separator is that the paint vehicle by tool isolate conductive effect is coated with and constitutes with masking device.
19, as claim 12 or 14 described printing-circuit board modules, it is characterized in that with masking device, this second masking device simultaneously with printed circuit board (PCB) on set earth point be a conducting.
20, the printing-circuit board module with masking device as claimed in claim 13 is characterized in that, this first masking device simultaneously with printed circuit board (PCB) on set earth point be a conducting.
21, the printing-circuit board module with masking device as claimed in claim 13 is characterized in that, the bottom of this first masking device is to be welded on the surface of printed circuit board (PCB) reverse side in the solid welding mode.
22, as claim 12 or 14 described printing-circuit board modules, it is characterized in that the bottom of this second masking device is to be welded on the surface in printed circuit board (PCB) front in the solid welding mode with masking device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410058234 CN1276700C (en) | 2004-08-17 | 2004-08-17 | Electromagnetic interference masking method and shading device and printing circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410058234 CN1276700C (en) | 2004-08-17 | 2004-08-17 | Electromagnetic interference masking method and shading device and printing circuit board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1589095A CN1589095A (en) | 2005-03-02 |
| CN1276700C true CN1276700C (en) | 2006-09-20 |
Family
ID=34603336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410058234 Expired - Fee Related CN1276700C (en) | 2004-08-17 | 2004-08-17 | Electromagnetic interference masking method and shading device and printing circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1276700C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100489867C (en) * | 2005-12-23 | 2009-05-20 | 鸿富锦精密工业（深圳）有限公司 | System and method for setting part height limiting zone |
| KR100851075B1 (en) * | 2007-04-30 | 2008-08-12 | 삼성전기주식회사 | Electromagnetic bandgap structure and printed circuit board |
| CN105711252B (en) * | 2016-02-01 | 2018-06-19 | 江汉大学 | Printing equipment based on electromagnetic compatibility |
| CN106060445B (en) * | 2016-07-20 | 2019-06-25 | 湖北誉恒科技有限公司 | Hard disk video recorder |
| JP7081463B2 (en) * | 2018-11-30 | 2022-06-07 | 株式会社オートネットワーク技術研究所 | Electrical junction box |
-
2004
- 2004-08-17 CN CN 200410058234 patent/CN1276700C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1589095A (en) | 2005-03-02 |
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Granted publication date: 20060920 Termination date: 20180817 |