CN104684241A - Circuit board - Google Patents
Circuit board Download PDFInfo
- Publication number
- CN104684241A CN104684241A CN201310628906.3A CN201310628906A CN104684241A CN 104684241 A CN104684241 A CN 104684241A CN 201310628906 A CN201310628906 A CN 201310628906A CN 104684241 A CN104684241 A CN 104684241A
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- Prior art keywords
- hole
- conductive
- circuit board
- protective layer
- screw
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Abstract
The invention relates to a circuit board which comprises a board body, a protective layer and a screw. A conductive through hole is formed on the surface of the board body; a copper exposed region is formed around the conductive through hole; the protective layer is provided with a crevasse; the periphery of the crevasse radially extend to form a plurality of slits; the crevasse is aligned with an opening of the conductive through hole and the size of the crevasse is smaller than that of the opening of the conductive through hole; a region between each two adjacent slits at least covers parts of the copper exposed region; the screw is locked in the conductive through hole; at least part of the protective layer is clamped and fixed between the screw and the conductive through hole.
Description
Technical field
The invention relates to a kind of circuit board, be more particularly a kind of can anti electromagnetic wave interference circuit board.
Background technology
Electronic equipment all can have intermittent or successional voltage, electric current and electric field change when operating, sometimes rate of change is quite fast, and then cause the electromagnetic energy producing induction between different frequency (frequency) or a frequency band (band), this electromagnetic energy then can be transmitted in the environment of surrounding by corresponding circuit, and the interference that generates electromagnetic waves (Electromagnetic Interference, EMI).
At present, copper can be revealed usually in the screw hole surface of general circuit plate, and the screening can of electronic equipment is then by screw hole strap circuits plate.The structure of this screening can overlap joint screw hole, make electron stream easily by circuit board internal layer via the dew copper surface conductive of screw hole to screening can, and then the interference that generates electromagnetic waves, causes EMI test crash.
For example, please refer to Fig. 1, it is the plate body stereogram of the circuit board illustrating conventional art.As shown in the figure, the surface 101 of plate body 100 can comprise multiple electronic components 102 and at least one conductive through hole 110.Electronic components 102 can be the element that the plate body 100 of the circuit boards such as electric capacity, inductance or connectivity port can carry.
Around the opening 111 of conductive through hole 110, there is Lu Tong district 120.After screw (not illustrating) locks and enters conductive through hole 110, Lu Tong district 120 can contact with screw, electron stream is caused easily to be transmitted to the screening can of electronic installation via Lu Tong district 120 and the screw of screw hole by circuit board internal layer, this i.e. the existing picture of so-called jumping electricity, and can cause EMI test crash.
Summary of the invention
An aspect of the present invention proposes a kind of circuit board, to solve the problem of conventional art.
According to one embodiment of the invention, provide a kind of circuit board, it comprises plate body, protective layer and screw.Plate body surface has conductive through hole, and has Lu Tong district around conductive through hole.Protective layer has cut, and cut ambient radiation shape extends multiple slit.Cut aims at the opening size that the opening of conductive through hole and the size of cut are less than conductive through hole, at least cover part Lu Tong district, region between two adjacent slits.Screwed lock is enclosed in conductive through hole, and at least part of protective layer is fastened between screw and conductive through hole.
According to one embodiment of the invention, above-mentioned cut is arranged in the opening of conductive through hole at least partly in the orthographic projection of plate body.
According to one embodiment of the invention, the opening of the region coverage fraction conductive through hole between above-mentioned two adjacent slits.
According to one embodiment of the invention, the subregion between above-mentioned two adjacent slits is between screw and the hole wall of conductive through hole.
According to one embodiment of the invention, above-mentioned cut and each slit form one meter of word pattern.
According to one embodiment of the invention, the width of above-mentioned each slit is less than or equal to 0.2 millimeter (mm).
According to one embodiment of the invention, the length of above-mentioned each slit is less than or equal to 2 millimeters (mm).
According to one embodiment of the invention, the thickness of above-mentioned protective layer is 0.2 millimeter (mm).
According to one embodiment of the invention, the material mylar (Mylar) of above-mentioned protective layer.
According to one embodiment of the invention, above-mentioned protective layer comprises electromagnetic wave absorbent material.
In sum, the above embodiment of the present invention at least has the following advantages:
1. the dew copper region around the conductive through hole being covered plate body by protective layer, after making screw locking enter conductive through hole, screw can not directly contact with dew copper region, reduction electromagnetic interference.
2. the opening of the region coverage fraction conductive through hole between the slit of protective layer and can be bent and enter in conductive through hole, therefore screw locks in conductive through hole by the regional guidance between slit.
Accompanying drawing explanation
For allowing the present invention and advantage thereof become apparent, the description references of institute's accompanying drawings is as follows:
Fig. 1 is the plate body stereogram of the circuit board illustrating conventional art.
Fig. 2 is the stereogram of an embodiment of the plate body illustrating circuit board of the present invention.
Fig. 3 is the partial enlarged drawing illustrating Fig. 2.
Fig. 4 is the profile of the protective layer illustrating Fig. 3.
Fig. 5 is the stereogram of the embodiment illustrating circuit board of the present invention.
Fig. 6 illustrates the profile along line segment AA` in Fig. 5.
[symbol description]
10: circuit board
100: plate body
101: surface
102: electronic components
110: conductive through hole
111: opening
120: Lu Tong district
230: protective layer
231: cut
232: slit
233: electromagnetic wave absorbent material
234: hole wall
240: screw
D1: width
D2: length
D3: thickness
R: region
Embodiment
Below will with graphic exposure multiple embodiment of the present invention, as clearly stated, the details in many practices will be explained in the following description.But should be appreciated that, the details in these practices is not applied to limit the present invention.In addition, graphic only for the purpose of description, do not map according to life size.For making to be convenient to understand, in following explanation, similar elements illustrates with identical symbology.
First; system of the present invention is electrically connected in order to avoid conventional art Zhong Lutong district 120 and the screw locked into conductive through hole 110; and then interference (the Electromagnetic Interference that generates electromagnetic waves; EMI); thus a protective layer 230 (being illustrated in Fig. 2 to Fig. 5) is covered Lu Tong district 120, to avoid jumping electrical phenomena and reducing Electromagnetic Interference.
Please also refer to Fig. 1, Fig. 2 and Fig. 3, wherein Fig. 2 is the stereogram of an embodiment of the plate body illustrating circuit board of the present invention, and Fig. 3 is the partial enlarged drawing illustrating Fig. 2.As shown in the figure, plate body 100 of the present invention is different from the plate body 100 of Fig. 1 to be, the surface 101 of plate body 100 of the present invention is coated with layer protective layer 230.Protective layer 230 has cut 231, and multiple slit 232.Each slit 232 is ambient radiation from cut 231 and goes out.
The size of cut 231 is less than the size of the opening 111 of conductive through hole 110; and when protective layer 230 pastes the surface 101 to plate body 100; cut 231 is the opening 111 aiming at conductive through hole 110, and the region R at least cover part Lu Tong district 120 between two adjacent slots 232.Thus, make the Lu Tong district 120 on the surface 101 of plate body 100 can nearly all cover by protective layer 230.
More specifically, the bore of the cut 231 of the present embodiment is less than the bore of the opening 111 of conductive through hole 110, and the width D 1 of slit 232 is less than or equal to 0.2 millimeter (mm), and the length D2 of slit 232 is less than or equal to 2 millimeters (mm).Thus, when product practical application, if the bore of the opening 111 of conductive through hole 110 also calculates for 2mm for 2mm, Lu Tong district 120 width, the area in Ze Lutong district 120 is about 12 π mm
2.If review slit 232 number to calculate with the slit of 6 in Fig. 3 232, and slit 232 is approximately rectangle, then the area of known slit 232 is about 0.2*2*6mm
2, amount to and be at least less than 2.4mm
2.It can thus be appreciated that, the exposed about 2.4mm of slit 232
2/ 12 π mm
2lu Tong district 120, amount to be less than 6.3%.That is the protective layer 230 of the present embodiment at least can cover the Lu Tong district 120 of 93.7%.
It should be noted that, slit 232 number disclosed by the present embodiment is also not used to limit the present invention.In other embodiments of the invention, slit 232 number can be eight and distance or unequal spacing distance are arranged in the pattern of similar rice font at equal intervals.
Then, please refer to Fig. 4, it is the profile of the protective layer illustrating Fig. 3.As shown in the figure; the protective layer 230 of the present embodiment can thickness D3 can be 0.2mm, after making screw locking enter conductive through hole 110, the thickness of protective layer 230 can at least define a gap; to avoid the Lu Tong district 120 remaining minority exposed directly to touch screw, and then cause electromagnetic interference.
It is worth mentioning that, in the present embodiment, the material of protective layer 230 can be mylar (Mylar), and has certain pliability.Further, in some embodiments, absorbing the ability of electromagnetic interference to strengthen protective layer 230, in protective layer 230, electromagnetic wave absorbent material 233 can be included, such as barium titanate (BaTiO3) etc.
Then, please refer to Fig. 5 and Fig. 6, Fig. 5 is the stereogram of the embodiment illustrating circuit board of the present invention, and Fig. 6 illustrates the profile along line segment AA` in Fig. 5.As shown in the figure, circuit board 10 comprises plate body 100, protective layer 230 and screw 240.In order to clearly demonstrate feature of the present invention, the screw 240 of Fig. 5 is that part locks in conductive through hole 110.It is to be understood that when product practical application, screw 240 can lock in conductive through hole 110 completely.
As shown in the figure, when screw 240 locks in conductive through hole 110, at least part of protective layer 230 is fastened between screw 240 and conductive through hole 110.More specifically, please also refer to Fig. 3, in the present embodiment, cut 231 is arranged in the opening 111 of conductive through hole 110 at least partly in the orthographic projection of plate body 100.In addition, the opening 111 of R cover part, the region conductive through hole 110 between two adjacent slits 232.Thus; when screw 240 locks the state entering conductive through hole 110 completely; because protective layer 230 has certain pliability; so region R between two adjacent slits 232 also part be bent and enter in conductive through hole 110, the region R-portion between two adjacent slits 232 is positioned between the hole wall 234 (being illustrated in Fig. 6) of conductive through hole 110 and screw 240.
It can thus be appreciated that, the design that the present embodiment is extended out around cut 231 by multiple slit 232, make the protective layer 230 around cut 231 divided go out multiple region R.Regional R, when screw 240 locks into conductive through hole 110, can be bent thereupon enter in conductive through hole 110, reach leadscrew 240 and lock the effect entering conductive through hole 110.In addition, the present embodiment, by the design of slit 232, can make the exposed area in the Lu Tong district 120 of conductive through hole 110 significantly reduce more than 94%, use reduction Electromagnetic Interference.
In sum, in above-described embodiment that the present invention discloses, by the design of protective layer, the problem of electromagnetic interference is solved.In addition, the subregion between the slit of protective layer can be bent and enter in conductive through hole, reaches leadscrew and locks the effect entering conductive through hole.
Although the present invention discloses as above with execution mode; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, therefore protection scope of the present invention is when being as the criterion depending on the accompanying claim person of defining.
Claims (10)
1. a circuit board, comprises:
One plate body, its surface has a conductive through hole, and the around openings of this conductive through hole has a Lu Tong district;
One protective layer, there is a cut, this cut ambient radiation shape extends multiple slit, and this cut aims at the opening of this conductive through hole and this break size is less than the opening size of this conductive through hole, at least this Lu Tong district, cover part, region between two adjacent these slits; And
One screw, lock into this conductive through hole, this protective layer is fastened between this screw and this conductive through hole at least partly.
2. circuit board as claimed in claim 1, it is characterized in that, this cut is arranged in the opening of this conductive through hole at least partly in the orthographic projection of this plate body.
3. circuit board as claimed in claim 1, is characterized in that, the opening of this conductive through hole of region coverage fraction between two adjacent these slits.
4. circuit board as claimed in claim 1, is characterized in that, the subregion between two adjacent these slits is between this screw and hole wall of this conductive through hole.
5. circuit board as claimed in claim 1, it is characterized in that, this cut and those slits form one meter of word pattern.
6. circuit board as claimed in claim 1, it is characterized in that, respectively the width of this slit is less than or equal to 0.2 millimeter.
7. circuit board as claimed in claim 1, it is characterized in that, respectively the length of this slit is less than or equal to 2 millimeters.
8. circuit board as claimed in claim 1, it is characterized in that, the thickness of this protective layer is 0.2 millimeter.
9. circuit board as claimed in claim 1, it is characterized in that, the material of this protective layer is mylar.
10. circuit board as claimed in claim 8, it is characterized in that, this protective layer comprises electromagnetic wave absorbent material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310628906.3A CN104684241B (en) | 2013-11-29 | 2013-11-29 | Circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310628906.3A CN104684241B (en) | 2013-11-29 | 2013-11-29 | Circuit board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104684241A true CN104684241A (en) | 2015-06-03 |
| CN104684241B CN104684241B (en) | 2017-12-08 |
Family
ID=53318654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310628906.3A Active CN104684241B (en) | 2013-11-29 | 2013-11-29 | Circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104684241B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2094073A (en) * | 1981-02-19 | 1982-09-08 | Fontainemelon Horlogerie | Electrical connecting arrangement for connecting between a cell and the circuit of a watch |
| US5237132A (en) * | 1991-06-17 | 1993-08-17 | Nhk Spring Co., Ltd. | Metallic printed circuit board with countersunk mounting hole |
| CN201383899Y (en) * | 2009-03-20 | 2010-01-13 | 英业达股份有限公司 | Circuit board and organism applying same |
| CN102378537A (en) * | 2010-08-26 | 2012-03-14 | 张方荣 | Fixing structure of circuit board |
| CN202514191U (en) * | 2012-01-13 | 2012-10-31 | 苏州江能电气设备有限公司 | Apparatus capable of realizing parallel splicing connection of two electrical cabinets |
-
2013
- 2013-11-29 CN CN201310628906.3A patent/CN104684241B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2094073A (en) * | 1981-02-19 | 1982-09-08 | Fontainemelon Horlogerie | Electrical connecting arrangement for connecting between a cell and the circuit of a watch |
| US5237132A (en) * | 1991-06-17 | 1993-08-17 | Nhk Spring Co., Ltd. | Metallic printed circuit board with countersunk mounting hole |
| CN201383899Y (en) * | 2009-03-20 | 2010-01-13 | 英业达股份有限公司 | Circuit board and organism applying same |
| CN102378537A (en) * | 2010-08-26 | 2012-03-14 | 张方荣 | Fixing structure of circuit board |
| CN202514191U (en) * | 2012-01-13 | 2012-10-31 | 苏州江能电气设备有限公司 | Apparatus capable of realizing parallel splicing connection of two electrical cabinets |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104684241B (en) | 2017-12-08 |
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Effective date of registration: 20191216 Address after: Floor 1, building 3, No. 988, Xinxing Second Road, Pinghu Economic Development Zone, Jiaxing City, Zhejiang Province Patentee after: Jiaxing Weivo Semiconductor Co., Ltd. Address before: 201114 Shanghai City Caohejing export processing zone of Minhang District Pu Xing Road No. 789 Co-patentee before: Yingda Co., Ltd. Patentee before: Yingda Technology Co., Ltd. |
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| TR01 | Transfer of patent right |