CN206759825U

CN206759825U - Surface mount steel mesh

Info

Publication number: CN206759825U
Application number: CN201720672360.5U
Authority: CN
Inventors: 罗嗣林; 尹传春
Original assignee: Jiangxi Holitech Technology Co Ltd
Current assignee: Jiangxi Holitech Technology Co Ltd
Priority date: 2017-06-09
Filing date: 2017-06-09
Publication date: 2017-12-15
Anticipated expiration: 2027-06-09

Abstract

The utility model discloses a kind of surface mount steel mesh, it includes steel mesh matrix (100), described steel mesh matrix (100) is provided with some perforate modules, and described perforate module is provided with the first standard perforate (1), the second standard perforate (2) and the 3rd standard perforate (3)；The 3rd described standard perforate (3) is formed by the vertical array arrangement of some first rectangular openings (31), each described the first rectangular opening (31) centre position is provided with block (32), and described the first rectangular opening (31) is separated into " day " font perforate by the block (32).A kind of surface mount steel mesh disclosed in the utility model, steel mesh perforate is in " day " font, and tin cream amount on pad is divided into two parts, prevents tin cream scaling powder and rosin in welding from can not discharge, cavity is formed, so as to reach the optimum efficiency of welding, reduce the bad steel mesh technique of quality.

Description

Surface mount steel mesh

Technical field

SMT (Surface Mounted Technology) surface mounting technology is the utility model is related to, is specifically one kind Surface mount steel mesh.

Background technology

Fingerprint recognition products application is more and more wider at present, and product category is also more and more, and the LGA welding to fingerprint chip will Ask very high, the also diversification of SMT making technologies, the welding of fingerprint chip can not be met according to the SMT steel mesh perforate modes often having It is required that the cavity ratio, tin buret control requirement to scolding tin are strict, manufacture difficulty, scrappage are added, influences productivity effect.

The content of the invention

Technical problem to be solved in the utility model is：A kind of surface mount steel mesh is provided, steel mesh perforate is in " day " word Type, tin cream amount on pad is divided into two parts, prevents tin cream scaling powder and rosin in welding from can not discharge, form cavity, from And reach the optimum efficiency of welding, reduce the bad steel mesh technique of quality.

Technical solution adopted in the utility model is：A kind of surface mount steel mesh is provided, it includes steel mesh matrix, described Steel mesh matrix be provided with some perforate modules, described perforate module, which is provided with, to be used for the first standard of connector welding and opens Hole, small IC and resistance capacitance the second standard perforate and the 3rd standard perforate for LGA package welding are driven for welding；

The 3rd described standard perforate is formed by some vertical array arrangements of first rectangular opening, each the first described rectangular opening Centre position is provided with block, and the first described rectangular opening is separated into " day " font perforate by the block.

Further, the circle for mark effect is additionally provided with the perforate module of described four Angle Positions of steel mesh matrix Hole.

Further, it is PCB pads with the 3rd standard perforate correspondence position below described steel mesh matrix, the described the 3rd Laterally long edge lengths are more than pad long side for standard perforate, and the length of the 3rd standard perforate longitudinal direction short side is more than pad short side.

Preferably, the long edge lengths of the 3rd described standard perforate are bigger 0.1mm than pad long side；3rd standard perforate Bond length is bigger 0.1mm than pad short side.

Further, described stop width is 0.1mm.

Further, the first described standard perforate includes the first long lumbar hole and the second rectangular opening of some array arrangements.

Further, the second described standard perforate includes first hole, along the first hole on steel mesh matrix Some second long lumbar holes are circumferentially with, described steel mesh matrix, which is located in the second long lumbar hole outer fix, is additionally provided with second hole.

After above structure, the technical solution of the utility model mutually has following technological merit with prior art：

Perforate, which is applied to bottom, the component of pad, " day " font opening on steel mesh, tin cream amount on pcb board pad is divided Into two parts, prevent tin cream scaling powder and rosin in welding from can not discharge, form cavity；Such LGA class component PIN pad Larger, in order to prevent the few tin phenomenon of pad, length than pad of the length, width of " day " font opening, width dimensions are big, with Upper open-celled structure can increase tin cream amount, reach quality and stabilize, and improve the yield and performance of product.

Brief description of the drawings

Fig. 1 is surface mount steel net structure schematic diagram of the present utility model.

Fig. 2 is amplification assumption diagram at perforate module X in Fig. 1.

Fig. 3 is enlarged drawing at Y in Fig. 2.

Wherein, 100, steel mesh matrix 1, the first standard perforate 11, the first long lumbar hole 12, the second rectangular opening 2, the second standard are opened Hole 21, first hole 22, the second long lumbar hole 23, second hole 3, the 3rd standard perforate 31, the first rectangular opening 32, block 4, circular hole 5th, pad

Embodiment

The utility model is described in further detail with reference to the accompanying drawings and detailed description.

As shown in Figures 1 to 3, a kind of surface mount steel mesh provided by the utility model, it includes steel mesh matrix 100, described Steel mesh matrix 100 be provided with some perforate modules, described perforate module is provided with the first standard for being used for connector welding Perforate 1, small IC and resistance capacitance the second standard perforate 2 and the 3rd standard for LGA package welding are driven for welding Perforate 3；

The 3rd described standard perforate 3 is formed by some first rectangular opening, 31 vertical array arrangements, the first described rectangle The centre position of hole 31 is provided with block 32, and the first described rectangular opening is separated into " day " font perforate by the block 32, when steel mesh is put When being placed on pcb board, tin cream on pad 5 is divided into two pieces by the middle block 32 of " day " the font perforate, effectively prevents tin cream Area is excessive and bubble is produced in centre, and scaling powder and rosin of the tin cream in welding also can be with the both sides bore edges rows of block 32 Go out, improve welding quality, lift properties of product.

The circular hole 4 for mark effect, the circular hole are additionally provided with the perforate module of described 100 4 Angle Positions of steel mesh matrix For correctly distinguishing, identifying steel mesh and pcb board attachment direction.

The described lower section of steel mesh matrix 100 and the correspondence position of the 3rd standard perforate 3 are pad 5, and the 3rd described standard is opened Laterally long edge lengths are more than the long side of pad 5 in hole 3, and the length of 3 longitudinal short side of the 3rd standard perforate is more than the short side of pad 5, in other words Say and be exactly, the 3rd standard perforate 3 it is each when pad 5 is each between leave some gaps, tin cream amount can be increased, prevent few tin from showing As.

The long edge lengths of the 3rd described standard perforate 3 are bigger 0.1mm than pad long side；The short side length of 3rd standard perforate 3 Degree is bigger 0.1mm than pad short side.

The described width of block 31 is 0.1mm.

The first described standard perforate 1 includes the first long lumbar hole 11 and the second rectangular opening 12 of some array arrangements.

The second described standard perforate 2 includes first hole 21, along the week of the first hole 21 on steel mesh matrix 100 Second party is additionally provided with to provided with some second long lumbar holes 22, the steel mesh matrix 100 is located in the outer fix of the second long lumbar hole 22 Hole 23.

The utility model preferred embodiment is described above, but is not to be construed as limiting the scope of the invention. The utility model is not only limited to above example, and its concrete structure allows to change, all in the utility model demand for independence The various change made in protection domain is in the scope of protection of the utility model.

Claims

1. a kind of surface mount steel mesh, it includes steel mesh matrix (100), it is characterised in that：Set on described steel mesh matrix (100) There are some perforate modules, described perforate module is provided with the first standard perforate (1) for being used for connector welding, is driven for welding Move small IC and resistance capacitance the second standard perforate (2) and the 3rd standard perforate (3) for LGA package welding；

The 3rd described standard perforate (3) is formed by the vertical array arrangement of some first rectangular openings (31), each the first described square Shape hole (31) centre position is provided with block (32), and described the first rectangular opening (31) is separated into " day " font and opened by the block (32) Hole.

2. surface mount steel mesh according to claim 1, it is characterised in that：Described (100) four Angle Positions of steel mesh matrix Perforate module on be additionally provided with for mark effect circular hole (4).

3. surface mount steel mesh according to claim 1, it is characterised in that：With the below described steel mesh matrix (100) Three standard perforate (3) correspondence positions are pad (5), and laterally long edge lengths are more than pad (5) to each described the first rectangular opening (31) Long side, the length of the first rectangular opening (31) longitudinal short side are more than pad (5) short side.

4. surface mount steel mesh according to claim 3, it is characterised in that：The long length of side of described the first rectangular opening (31) Degree is bigger 0.1mm than pad long side；The bond length of first rectangular opening (31) is bigger 0.1mm than pad short side.

5. surface mount steel mesh according to claim 1, it is characterised in that：Described block (32) width is 0.1mm.

6. surface mount steel mesh according to claim 1, it is characterised in that：The first described standard perforate (1) is if include The first long lumbar hole (11) and the second rectangular opening (12) of dry array arrangement.

7. surface mount steel mesh according to claim 1, it is characterised in that：The second described standard perforate (2) includes the One square hole (21), some second long lumbar holes (22), institute are circumferentially with along the first hole (21) on steel mesh matrix (100) State steel mesh matrix (100) and be located in the second long lumbar hole (22) outer fix and be additionally provided with second hole (23).