New printing steel mesh structure

Abstract

The utility model discloses a novel printed steel mesh structure, which can realize printing of different solder paste thicknesses for different components and improve the quality of subsequent welding processes. The novel printed steel mesh structure includes a first steel mesh and a second steel mesh stacked on the upper surface of the first steel mesh; the steel mesh structure is provided with two types of tin point holes, including a first tin point hole and a second tin point hole; the first tin point hole includes a first conical hole provided on the first steel mesh, and a second conical hole provided on the second steel mesh and coaxial with the first conical hole; the second conical hole has the same taper as the first conical hole, and the lower end of the second conical hole is smoothly connected with the upper end of the first conical hole; the second tin point hole includes a first through hole provided on the first steel mesh, and a second through hole provided on the second steel mesh and coaxial with the first through hole; the size of the second through hole is larger than the first through hole, so that a step is formed between the lower end of the second through hole and the upper surface of the first steel mesh.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit board printing, in particular to a novel printing steel mesh structure. Background Art

[0002] With the rapid development of the electronics industry (FPC+SMT technology), flexible circuit boards are rapidly reshuffled in the fierce market competition, and high-quality products will naturally be favored by more customers. The assembly positioning method of FPC and the counterpart has gradually evolved from the traditional positioning by the outer edge and slot to positioning by the component contour edge, which means that the precision requirements for component placement are getting higher and higher, and also puts higher requirements on the existing SMT process capabilities. In the face of this market change trend, it is urgent to find a technical means to improve the placement accuracy of components to meet the corresponding market demand.

[0003] Generally speaking, the placement accuracy of components mainly depends on the position of the PAD to be soldered, the size of the PAD, and the amount of solder paste required for soldering. Among them, different solder paste thicknesses need to be printed on the same steel mesh according to the different components to be mounted, so that the solder paste thickness is adapted to the components to obtain good welding quality. Traditional printed steel meshes are usually made in the "single-layer laser straight-edge opening" method, which cannot meet the tin amount requirements of different components, and when the solder paste is printed multiple times, it is easy to block the holes, resulting in less tin or tin leakage in the welding PAD. Utility Model Content

[0004] The purpose of the utility model is to provide a new type of printing steel mesh structure to solve the problems existing in the prior art, and to realize printing of different solder paste thicknesses for different components, thereby improving the quality of subsequent welding processes.

[0005] In order to achieve the above purpose, the solution of the utility model is:

[0006] A novel printing steel mesh structure comprises a first steel mesh and a second steel mesh stacked on the surface of the first steel mesh; the steel mesh structure is provided with two types of tin point holes, including a first tin point hole and a second tin point hole; the first tin point hole comprises a first conical hole arranged in the first steel mesh, and a second conical hole arranged in the second steel mesh and coaxial with the first conical hole; the second conical hole has the same taper as the first conical hole, and the lower end of the second conical hole is smoothly connected with the upper end of the first conical hole; the second tin point hole comprises a first through hole arranged in the first steel mesh, and a second through hole arranged in the second steel mesh and coaxial with the first through hole; the size of the second through hole is larger than the first through hole, so that a step is formed between the lower end of the second through hole and the upper surface of the first steel mesh.

[0007] The first steel mesh is connected to the second steel mesh into an integrated structure by welding or bonding.

[0008] The taper of the first tapered hole and the second tapered hole is no greater than 10°.

[0009] The first through hole and the second through hole are configured as tapered holes.

[0010] After adopting the above technical solution, the utility model has the following technical effects:

[0011] (1) The utility model is formed by compositely forming a thickened steel mesh structure with a first steel mesh and a second steel mesh, and forming two types of first tin point holes and second tin point holes on the steel mesh structure to respectively adapt to different tin amount requirements, wherein the tin point thickness of the first tin point hole is the thickness of two layers of steel mesh, and is suitable for locations requiring a large amount of tin. The tin point thickness of the second tin point hole is only the thickness of a single layer of steel mesh due to the existence of a step, and is suitable for locations requiring a small amount of tin.

[0012] (2) According to the mounting position and tin amount requirements of different components, the thickness of solder paste can be controlled more accurately, which creates better conditions for component welding and improves the mounting accuracy of components;

[0013] (3) In the utility model, the first conical hole and the first through hole of the first steel mesh and the second conical hole and the second through hole of the second steel mesh can be independently formed by laser drilling, and then the first steel mesh and the second steel mesh are overlapped to obtain a steel mesh structure. Compared with directly forming the first tin hole and the second tin hole with a thicker steel mesh, the production process is simpler and the precision of the processed first tin hole and the second tin hole is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model;

[0015] Description of Figure Numbers:

[0016] 1-first steel mesh; 2-second steel mesh; 3-first point tin hole; 4-second point tin hole; 5-first tapered hole; 6-second tapered hole; 7-first through hole; 8-second through hole; 9-step;

[0017] a-FPC. DETAILED DESCRIPTION

[0018] In order to further explain the technical solution of the present utility model, the present utility model is described in detail below through specific embodiments.

[0019] refer to Figure 1As shown, the utility model discloses a novel printed steel mesh structure, comprising a first steel mesh 1 and a second steel mesh 2 stacked on the upper surface of the first steel mesh 1. When in use, the lower surface of the first steel mesh 1 is bonded to the upper surface of the FPC a;

[0020] The steel mesh structure is provided with two types of tin point holes, including a first tin point hole 3 and a second tin point hole 4;

[0021] The first tin point hole 3 includes a first tapered hole 5 provided on the first steel mesh 1, and a second tapered hole 6 provided on the second steel mesh 2 and coaxial with the first tapered hole 5; the second tapered hole 6 has the same taper as the first tapered hole 5, and the lower end of the second tapered hole 6 is smoothly connected with the upper end of the first tapered hole 5;

[0022] The second tin point hole 4 includes a first through hole 7 arranged on the first steel mesh 1, and a second through hole 8 arranged on the second steel mesh 2 and coaxial with the first through hole 7; the size of the second through hole 8 is larger than the first through hole 7, so that a step 9 is formed between the lower end of the second through hole 8 and the upper surface of the first steel mesh 1.

[0023] Through the above scheme, the utility model is compositely formed by the first steel mesh 1 and the second steel mesh 2 into a thickened steel mesh structure, and two types of first tin point holes 3 and second tin point holes 4 are formed on the steel mesh structure to respectively adapt to different tin amount requirements, wherein the tin point thickness of the first tin point hole 3 is the thickness of the two layers of steel mesh, which is suitable for positions requiring more tin amount, and the tin point thickness of the second tin point hole 4 is only the thickness of the single layer of steel mesh due to the existence of the step 9, which is suitable for positions requiring less tin amount; thereby, it can be more accurately targeted at the mounting positions and tin amount requirements of different components. The thickness of the solder paste is controlled, which creates better conditions for the welding of components and improves the mounting accuracy of components. In the utility model, the first conical hole 5 and the first through hole 7 of the first steel mesh 1 and the second conical hole 6 and the second through hole 8 of the second steel mesh 2 can be independently formed by laser opening, and then the first steel mesh 1 and the second steel mesh 6 are overlapped to obtain a steel mesh structure. Compared with directly forming the first tin hole 3 and the second tin hole 4 with a thicker steel mesh, the generation process is simpler, and the precision of the processed first tin hole 3 and the second tin hole 4 is higher.

[0024] Specific embodiments of the present utility model are shown below.

[0025] The first steel mesh 1 is connected to the second steel mesh 2 into an integrated structure by welding, bonding, etc., so that the first steel mesh 1 is fixed on the upper surface of the second steel mesh 2 to ensure the coaxiality between the holes.

[0026] The taper of the first tapered hole 5 and the second tapered hole 6 is no more than 10°, which facilitates the smoothness of tinning after tinning, is not easy to block the holes, can reduce the cleaning frequency of the steel mesh structure, and improve the working efficiency.

[0027] The first through hole 7 and the second through hole 8 are also configured as tapered holes, similar to the first tapered hole 5 and the second tapered hole 6 .

[0028] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A new type of printing steel mesh structure, characterized by: It comprises a first steel mesh and a second steel mesh stacked on the surface of the first steel mesh; The steel mesh structure is provided with two types of tin point holes, including first tin point holes and second tin point holes; The first tin point hole includes a first tapered hole provided in the first steel mesh, and a second tapered hole provided in the second steel mesh and coaxial with the first tapered hole; the second tapered hole has the same taper as the first tapered hole, and the lower end of the second tapered hole is smoothly connected with the upper end of the first tapered hole; The second tin point hole includes a first through hole arranged in the first steel mesh, and a second through hole arranged in the second steel mesh and coaxial with the first through hole; the size of the second through hole is larger than the first through hole so that a step is formed between the lower end of the second through hole and the upper surface of the first steel mesh.

2. The novel printing steel mesh structure as claimed in claim 1, characterized in that: The first steel mesh is connected to the second steel mesh into an integrated structure by welding or bonding.

3. The novel printing steel mesh structure as claimed in claim 1, characterized in that: The taper of the first tapered hole and the second tapered hole is no greater than 10°.

4. The novel printing steel mesh structure as claimed in claim 1, characterized in that: The first through hole and the second through hole are configured as tapered holes.

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