CN205311036U - SMT steel mesh - Google Patents
SMT steel mesh Download PDFInfo
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- CN205311036U CN205311036U CN201521134313.2U CN201521134313U CN205311036U CN 205311036 U CN205311036 U CN 205311036U CN 201521134313 U CN201521134313 U CN 201521134313U CN 205311036 U CN205311036 U CN 205311036U
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- steel mesh
- mesh opening
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Abstract
The utility model provides a can reduce the SMT steel mesh of PCB deflection, be provided with first steel mesh opening on the steel mesh, first steel mesh opening is the rectangle, a plurality of first steel mesh openings enclose synthetic rectangle frame on the steel mesh, coincide for the part with two length of branch limits of the PCB pad that first steel mesh opening corresponds in two length of branch limits of first steel mesh open -ended, the long length of side of the PCB pad that the more first steel mesh opening in the long limit of first steel mesh open -ended corresponds, first steel mesh open -ended width is the same with the PCB pad that first steel mesh opening corresponds, the long limit of first steel mesh open -ended is outwards prolonged by the long limit of the PCB pad that corresponds with first steel mesh opening, the long limit of first steel mesh open -ended that is located every limit both ends of rectangle frame is located the long length of side of first steel mesh open -ended in the middle of every limit of rectangle frame. The utility model has the advantages of increase the steel mesh open -ended length of PCB edge, the last soldering tin volume of being close to the pad at four angles of PCB increases, has offset the PCB deflection, has reduced the emergence of rosin joint.
Description
Technical field
The utility model relates to SMT template, specifically a kind of SMT steel mesh.
Background technology
In the manufacturing processed of electronic product, it is necessary to use surface mounting technology (SMT, SurfaceMountTechnology) and various components and parts are welded to printed circuit board (PCB). Surface mount process flow process comprises substantially: at the coated on one side tin cream that PCB is to be welded, then the components and parts needing welding are mounted on the correspondence position of PCB, reflow soldering is carried out after completing the attachment of components and parts, this completes the attachment of components and parts of PCB wherein one side, surface mount after being up to the standards, can be completed.
The process being coated with tin cream in PCB substrate, the tin amount of coating is the key factor affecting welding quality, and tin amount is that the shape related to by the opening of steel mesh and size are determined. Excellent steel mesh opening design, can ensure good demoulding effect, can not cause solder shorts, open circuit or produce tin ball, and ensure good signal wiring and soldering reliability.
Castle type terminals P CB in electron trade and LGA package PCB, the steel mesh opening scheme used in its production is substantially all design according to pad size, and on PCB, all pad sizes are substantially identical, and steel mesh opening is just corresponding substantially identical. There is distortion in various degree owing to its characteristic mounts PCB in the production on mainboard in PCB production or PCB in the PCB encapsulation of PCBA, this kind of distortion is present in four corners of PCB usually, so just easily causes the generation of empty weldering.
Practical novel content
Technical problem to be solved in the utility model is: provide a kind of SMT steel mesh reducing PCB distortion amount.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of SMT steel mesh, described SMT steel mesh is provided with the first steel mesh opening, the first described steel mesh opening is rectangular, multiple first steel mesh opening encloses rectangle frame on steel mesh, two long limits of the PCB pad that two long limits of described first steel mesh opening are corresponding with the first steel mesh opening are for partially overlapping, the long length of side of the PCB pad that the long limit of described first steel mesh opening is corresponding compared with the first steel mesh opening, the PCB pad that the width of described first steel mesh opening is corresponding with the first steel mesh opening is identical, the long limit of described first steel mesh opening is by the long limit extend outwards of the PCB pad corresponding with the first steel mesh opening, the long limit being positioned at first steel mesh opening at two ends, rectangle frame every bar limit is relatively positioned at the long length of side of the first steel mesh opening in the middle of rectangle frame every bar limit.
Further, the short limit of the PCB pad described first steel mesh opening leaning on the short limit inside rectangle frame corresponding with the first steel mesh opening overlaps.
Further, described SMT steel mesh is also provided with the 2nd steel mesh opening, described 2nd steel mesh opening is square, and the length of side of the PCB pad that the length of side of described 2nd steel mesh opening is corresponding compared with the 2nd steel mesh opening is short, and the 2nd steel mesh opening is positioned at PCB pad central authorities corresponding to the 2nd steel mesh opening.
Further, described rectangle frame is square-shaped frame, and described first steel mesh opening is outwards translated along its length by the profile of the PCB pad corresponding with the first steel mesh opening, and the long length of side of the long limit of the first steel mesh opening PCB pad corresponding compared with the first steel mesh opening.
Further, described SMT steel mesh is also provided with the 2nd steel mesh opening, described 2nd steel mesh opening is square, the length of side of the PCB pad that the length of side of described 2nd steel mesh opening is corresponding compared with the 2nd steel mesh opening is short, and multiple 2nd steel mesh opening is that square formation formula is arranged in PCB pad central authorities corresponding to described multiple 2nd steel mesh opening.
Further, described SMT steel mesh is also provided with the 3rd steel mesh opening, the polarity mark on the corresponding PCB of described 3rd steel mesh opening is arranged.
The beneficial effects of the utility model are: the long limit of the first steel mesh opening is by the long limit extend outwards of the PCB pad corresponding with the first steel mesh opening, the long limit being positioned at first steel mesh opening at two ends, rectangle frame every bar limit is relatively positioned at the long length of side of the first steel mesh opening in the middle of rectangle frame every bar limit, so that PCB increases near the soldering tin amount of the pad at four angles, offset PCB distortion amount, reduce the generation of empty weldering.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment 1SMT steel mesh.
Fig. 2 is the schematic diagram of the utility model embodiment 1SMT steel mesh.
Fig. 3 is the structural representation of the utility model embodiment 2SMT steel mesh.
Fig. 4 is the schematic diagram of the utility model embodiment 2SMT steel mesh.
Fig. 5～Fig. 7 is the structural representation of several first steel mesh openings of the utility model SMT steel mesh.
Label illustrates:
1, SMT steel mesh; 2, the first steel mesh opening; 21, the PCB pad that the first steel mesh opening is corresponding; 3, the 2nd steel mesh opening; 31, the PCB pad that the 2nd steel mesh opening is corresponding; 4, the 3rd steel mesh opening.
Embodiment
By technology contents of the present utility model being described in detail, is realized object and effect, below in conjunction with enforcement mode and coordinate accompanying drawing to be explained.
The design of the utility model most critical is: the length increasing the steel mesh opening on PCB limit, and the soldering tin amount of the upper pad near four angles of PCB increases, and counteracts PCB distortion amount, decreases the generation of empty weldering.
Please refer to Fig. 1 to Fig. 7, a kind of SMT steel mesh, described SMT steel mesh 1 is provided with the first steel mesh opening 2, the first described steel mesh opening is rectangular, multiple first steel mesh opening encloses rectangle frame on steel mesh, two long limits of the PCB pad 21 that two long limits of described first steel mesh opening are corresponding with the first steel mesh opening are for partially overlapping, the long length of side of the PCB pad that the long limit of described first steel mesh opening is corresponding compared with the first steel mesh opening, the PCB pad that the width of described first steel mesh opening is corresponding with the first steel mesh opening is identical, the long limit of described first steel mesh opening is by the long limit extend outwards of the PCB pad corresponding with the first steel mesh opening, the long limit being arranged in first steel mesh opening at two ends, rectangle frame every bar limit is relatively positioned at the long length of side (first steel mesh opening on the limit that the rectangle frame of Fig. 2 and Fig. 4 is kept right of the first steel mesh opening in the middle of rectangle frame every bar limit, this first steel mesh opening is respectively as shown in Fig. 5～Fig. 7, the figure top shadow part being positioned at top is PCB pad, the figure top shadow part being positioned at lower section is the steel mesh opening that this PCB pad is corresponding).
From foregoing description, the beneficial effects of the utility model are: the long limit of the first steel mesh opening is by the long limit extend outwards of the PCB pad corresponding with the first steel mesh opening, the long limit being positioned at first steel mesh opening at two ends, rectangle frame every bar limit is relatively positioned at the long length of side of the first steel mesh opening in the middle of rectangle frame every bar limit, so that PCB increases near the soldering tin amount of the pad at four angles, offset PCB distortion amount, reduce the generation of empty weldering.
Further, the short limit of the PCB pad described first steel mesh opening leaning on the short limit inside rectangle frame corresponding with the first steel mesh opening overlaps.
Further, inwardly cave in the long limit of described first steel mesh opening (such as Fig. 6).
Seen from the above description, inwardly cave in the long limit of the first steel mesh opening, can reduce the local soldering tin amount of PCB pad corresponding to the first steel mesh opening, prevents tin pearl from oozing out.
Further, described SMT steel mesh is also provided with the 2nd steel mesh opening 3, described 2nd steel mesh opening is square, and the length of side of the PCB pad 31 that the length of side of described 2nd steel mesh opening is corresponding compared with the 2nd steel mesh opening is short, and the 2nd steel mesh opening is positioned at PCB pad central authorities corresponding to the 2nd steel mesh opening.
Further, described rectangle frame is square-shaped frame, and described first steel mesh opening is outwards translated along its length by the profile of the PCB pad corresponding with the first steel mesh opening, and the long length of side of the long limit of the first steel mesh opening PCB pad corresponding compared with the first steel mesh opening.
Further, described SMT steel mesh is also provided with the 2nd steel mesh opening, described 2nd steel mesh opening is square, the length of side of the PCB pad that the length of side of described 2nd steel mesh opening is corresponding compared with the 2nd steel mesh opening is short, and multiple 2nd steel mesh opening is that square formation formula is arranged in PCB pad central authorities corresponding to described multiple 2nd steel mesh opening.
Further, described SMT steel mesh is also provided with the 3rd steel mesh opening 4, the polarity mark on the corresponding PCB of described 3rd steel mesh opening is arranged.
Seen from the above description, steel mesh is reserved with the opening of polarity mark so that the attachment direction of PCB easily identifies.
Please refer to Fig. 1 and Fig. 2, embodiment 1 of the present utility model is: a kind of SMT steel mesh, described SMT steel mesh is provided with the first steel mesh opening 2, the first described steel mesh opening is rectangular, multiple first steel mesh opening encloses rectangle frame on steel mesh, two long limits of the PCB pad 21 that two long limits of described first steel mesh opening are corresponding with the first steel mesh opening are for partially overlapping, the long length of side of the PCB pad that the long limit of described first steel mesh opening is corresponding compared with the first steel mesh opening, the PCB pad that the width of described first steel mesh opening is corresponding with the first steel mesh opening is identical, the long limit of described first steel mesh opening is by the long limit extend outwards of the PCB pad corresponding with the first steel mesh opening, the long limit being positioned at first steel mesh opening at two ends, rectangle frame every bar limit is relatively positioned at the long length of side of the first steel mesh opening in the middle of rectangle frame every bar limit. the short limit of the PCB pad leaning on the short limit inside rectangle frame corresponding with the first steel mesh opening on described first steel mesh opening overlaps. inwardly cave in the long limit of described first steel mesh opening. described SMT steel mesh is also provided with the 2nd steel mesh opening 3, described 2nd steel mesh opening is square, the length of side of the PCB pad 31 that the length of side of described 2nd steel mesh opening is corresponding compared with the 2nd steel mesh opening is short, and the 2nd steel mesh opening is positioned at PCB pad central authorities corresponding to the 2nd steel mesh opening. also being provided with the 3rd steel mesh opening 4 on described SMT steel mesh, the polarity mark on the corresponding PCB of described 3rd steel mesh opening is arranged.
Please refer to Fig. 3 and Fig. 4, embodiment 2 of the present utility model is: a kind of SMT steel mesh, described SMT steel mesh 1 is provided with the first steel mesh opening 2, the first described steel mesh opening is rectangular, multiple first steel mesh opening encloses rectangle frame on steel mesh, two long limits of the PCB pad 21 that two long limits of described first steel mesh opening are corresponding with the first steel mesh opening are for partially overlapping, the long length of side of the PCB pad that the long limit of described first steel mesh opening is corresponding compared with the first steel mesh opening, the PCB pad that the width of described first steel mesh opening is corresponding with the first steel mesh opening is identical, the long limit of described first steel mesh opening is by the long limit extend outwards of the PCB pad corresponding with the first steel mesh opening, the long limit being positioned at first steel mesh opening at two ends, rectangle frame every bar limit is relatively positioned at the long length of side of the first steel mesh opening in the middle of rectangle frame every bar limit. described rectangle frame is square-shaped frame, and described first steel mesh opening is outwards translated along its length by the profile of the PCB pad corresponding with the first steel mesh opening, and the long length of side of the long limit of the first steel mesh opening PCB pad corresponding compared with the first steel mesh opening. described SMT steel mesh is also provided with the 2nd steel mesh opening 3, described 2nd steel mesh opening is square, the length of side of the PCB pad 31 that the length of side of described 2nd steel mesh opening is corresponding compared with the 2nd steel mesh opening is short, and multiple 2nd steel mesh opening is that square formation formula is arranged in PCB pad central authorities corresponding to described multiple 2nd steel mesh opening. also being provided with the 3rd steel mesh opening 4 on described SMT steel mesh, the polarity mark on the corresponding PCB of described 3rd steel mesh opening is arranged.
In sum, the useful effect of the steel mesh that the utility model provides is: the long limit of the first steel mesh opening is by the long limit extend outwards of the PCB pad corresponding with the first steel mesh opening, the long limit being positioned at first steel mesh opening at two ends, rectangle frame every bar limit is relatively positioned at the long length of side of the first steel mesh opening in the middle of rectangle frame every bar limit, so that PCB increases near the soldering tin amount of the pad at four angles, offset PCB distortion amount, reduce the generation of empty weldering; Inwardly caving in the long limit of the first steel mesh opening, can reduce the local soldering tin amount of corresponding PCB pad, prevent tin pearl from oozing out; Steel mesh is reserved with the opening of polarity mark so that the attachment direction of PCB easily identifies.
The foregoing is only embodiment of the present utility model; not thereby patent scope of the present utility model is limited; every equivalents utilizing the utility model specification sheets and accompanying drawing content to do; or directly or indirectly it is used in relevant technical field, all it is included in scope of patent protection of the present utility model with reason.
Claims (6)
1. a SMT steel mesh, it is characterized in that: described SMT steel mesh is provided with the first steel mesh opening, the first described steel mesh opening is rectangular, multiple first steel mesh opening encloses rectangle frame on steel mesh, two long limits of the PCB pad that two long limits of described first steel mesh opening are corresponding with the first steel mesh opening are for partially overlapping, the long length of side of the PCB pad that the long limit of described first steel mesh opening is corresponding compared with the first steel mesh opening, the PCB pad that the width of described first steel mesh opening is corresponding with the first steel mesh opening is identical, the long limit of described first steel mesh opening is by the long limit extend outwards of the PCB pad corresponding with the first steel mesh opening, the long limit being positioned at first steel mesh opening at two ends, rectangle frame every bar limit is relatively positioned at the long length of side of the first steel mesh opening in the middle of rectangle frame every bar limit.
2. SMT steel mesh according to claim 1, it is characterised in that: the short limit of the PCB pad leaning on the short limit inside rectangle frame corresponding with the first steel mesh opening on described first steel mesh opening overlaps.
3. SMT steel mesh according to claim 1, it is characterized in that: described SMT steel mesh is also provided with the 2nd steel mesh opening, described 2nd steel mesh opening is square, the length of side of the PCB pad that the length of side of described 2nd steel mesh opening is corresponding compared with the 2nd steel mesh opening is short, and the 2nd steel mesh opening is positioned at PCB pad central authorities corresponding to the 2nd steel mesh opening.
4. SMT steel mesh according to claim 1, it is characterized in that: described rectangle frame is square-shaped frame, described first steel mesh opening is outwards translated along its length by the profile of the PCB pad corresponding with the first steel mesh opening, and the long length of side of the long limit of the first steel mesh opening PCB pad corresponding compared with the first steel mesh opening.
5. SMT steel mesh according to claim 1, it is characterized in that: described SMT steel mesh is also provided with the 2nd steel mesh opening, described 2nd steel mesh opening is square, the length of side of the PCB pad that the length of side of described 2nd steel mesh opening is corresponding compared with the 2nd steel mesh opening is short, and multiple 2nd steel mesh opening is that square formation formula is arranged in PCB pad central authorities corresponding to described multiple 2nd steel mesh opening.
6. SMT steel mesh according to claim 1, it is characterised in that: being also provided with the 3rd steel mesh opening on described SMT steel mesh, the polarity mark on the corresponding PCB of described 3rd steel mesh opening is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521134313.2U CN205311036U (en) | 2015-12-30 | 2015-12-30 | SMT steel mesh |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521134313.2U CN205311036U (en) | 2015-12-30 | 2015-12-30 | SMT steel mesh |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205311036U true CN205311036U (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521134313.2U Active CN205311036U (en) | 2015-12-30 | 2015-12-30 | SMT steel mesh |
Country Status (1)
| Country | Link |
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| CN (1) | CN205311036U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107360675A (en) * | 2017-07-19 | 2017-11-17 | 郑州云海信息技术有限公司 | The web plate and preparation method of a kind of tetra- jiaos of poor short circuits of solution BGA |
| CN108012415A (en) * | 2017-11-17 | 2018-05-08 | 新华三技术有限公司 | Surface Mount pad structure, printed circuit board and its preparation process |
| CN110049635A (en) * | 2019-05-21 | 2019-07-23 | 深圳市华兴盛科技有限公司 | A kind of high-precision SMT steel mesh that PCB deflection is small |
| CN110678008A (en) * | 2019-09-24 | 2020-01-10 | 苏州浪潮智能科技有限公司 | Steel mesh of circuit board display connector and preparation method thereof |
| CN110933867A (en) * | 2019-12-20 | 2020-03-27 | 浪潮商用机器有限公司 | Tin coating tool and method for maintaining DIMM connector |
-
2015
- 2015-12-30 CN CN201521134313.2U patent/CN205311036U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107360675A (en) * | 2017-07-19 | 2017-11-17 | 郑州云海信息技术有限公司 | The web plate and preparation method of a kind of tetra- jiaos of poor short circuits of solution BGA |
| CN108012415A (en) * | 2017-11-17 | 2018-05-08 | 新华三技术有限公司 | Surface Mount pad structure, printed circuit board and its preparation process |
| CN110049635A (en) * | 2019-05-21 | 2019-07-23 | 深圳市华兴盛科技有限公司 | A kind of high-precision SMT steel mesh that PCB deflection is small |
| CN110678008A (en) * | 2019-09-24 | 2020-01-10 | 苏州浪潮智能科技有限公司 | Steel mesh of circuit board display connector and preparation method thereof |
| CN110933867A (en) * | 2019-12-20 | 2020-03-27 | 浪潮商用机器有限公司 | Tin coating tool and method for maintaining DIMM connector |
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