CN205961599U

CN205961599U - Prevent open cell structure of tin sweat(ing) printing steel mesh

Info

Publication number: CN205961599U
Application number: CN201620760997.5U
Authority: CN
Inventors: 龚悦; 胥会
Original assignee: Shenzhen C&D Electronics Co Ltd
Current assignee: Shenzhen C&D Electronics Co Ltd
Priority date: 2016-07-19
Filing date: 2016-07-19
Publication date: 2017-02-15
Anticipated expiration: 2026-07-19

Abstract

The utility model provides a prevent open cell structure of tin sweat(ing) printing steel mesh, prevent open cell structure of tin sweat(ing) printing steel mesh corresponds with the position of pad, and it includes first trompil, intermediate junction portion and second trompil in proper order from one side to the opposite side, the limit is connected to the second that intermediate junction portion includes the first connection limit be connected with first trompil, be connected with the second trompil, the arc that the limit is the indent is connected to first connection limit, second. Adopt the technical scheme of the utility model, when the tin cream is brushed on the pad through this printing steel screen print, thereby both sides are not because of there being the tin cream to cover that both sides all can not produce the tin sweat(ing) when the welding, and improve the quality of leads directly to the rate to reach can be effectual the production of prevention tin sweat(ing), welding to components and parts that again can be full have improved production efficiency, moreover can the volume of saving the tin cream, the cost is reduced.

Description

A kind of open-celled structure of anti-tin sweat(ing) printed steel mesh

Technical field

This utility model is related to a kind of printed steel mesh, the open-celled structure of more particularly, to a kind of anti-tin sweat(ing) printed steel mesh.

Background technology

At present, in the assembling of SMD product produces, typically by the way of printing by paste solder printing on pcb board, then Paster SMD components are attached to corresponding position welded, but traditional printed steel mesh is all to be opened according to the position of pad If square opening, be illustrated in figure 1 the steel mesh open-celled structure of a corresponding pad, be printed on pad by this printed steel mesh Tin cream face is centre no tin cream, and there is the structure of square tin cream face both sides, such tin cream when welding through high temperature reflux, inside middle Easily tin sweat(ing) occurs inside square scolding tin, cause failure welding.Improved printed steel mesh is that the common u-shaped of the indent adopting is opened The anti-tin sweat(ing) scheme in hole, as shown in Figure 2.But this scheme, for special type components and parts it is impossible to accomplish to prevent U-shaped perforate two The tin sweat(ing) of side produces, and so results in the need for manually processing, takes time and effort, and produces and low quality.Although excessive by steel The mesh of net reduces the generation that can prevent tin sweat(ing), but can reduce simultaneously its little with the bond area of components and parts it is impossible to meet weldering Connect standard.

Utility model content

For above technical problem, the utility model discloses a kind of open-celled structure of anti-tin sweat(ing) printed steel mesh, both reach Can effectively prevent the generation of tin sweat(ing), but can be full be welded to components and parts, meet welding requirements.

In this regard, the technical solution of the utility model is：

A kind of open-celled structure of anti-tin sweat(ing) printed steel mesh, the open-celled structure of described anti-tin sweat(ing) printed steel mesh and the position of pad Corresponding, it includes the first perforate, middle interconnecting piece and the second perforate from side to opposite side successively, and described middle interconnecting piece includes In the second connection being connected with the second perforate, described first connects side, the second connection for the first connection being connected with the first perforate Side is the arc of indent.Wherein, described middle interconnecting piece is not perforate.Using this technical scheme, tin cream passes through this printing steel When the open-celled structure of net is printed onto this pad, both sides in the middle of pad, because not having tin cream to cover thus all will not in both sides in welding Produce tin sweat(ing), improve quality first-pass yield.

As further improvement of the utility model, the described first minimum range connecting when being connected with second is pad The 1/8 ~ 2/5 of length.Using this technical scheme, in the case of reducing welding tin cream consumption, full welding component, and weld Connect and in rear pad, do not produce tin sweat(ing).

As further improvement of the utility model, described first connects in, the second symmetrical separation when connecting in described The both sides of middle interconnecting piece centrage.

As further improvement of the utility model, described first connect while, second connect while be semicircle.

As further improvement of the utility model, the described first minimum range connecting when being connected with second is pad The 1/6 ~ 1/3 of length.Using this technical scheme, in the case of reducing welding tin cream consumption as far as possible, welding that can be fuller Components and parts, while meeting weld strength requirement, and do not produce tin sweat(ing) in pad after welding.

Compared with prior art, the beneficial effects of the utility model are：

Using the technical solution of the utility model, when tin cream is printed onto on pad by this printed steel mesh, both sides are not because having Tin cream covers thus both sides all will not produce tin sweat(ing), improve quality first-pass yield, thus reach effectively to prevent in welding The generation of tin sweat(ing), and full can be welded to components and parts；Will not produce other abnormal, production quality and efficiency settle at one go, carry High production efficiency；And tin cream amount can be saved, reduce cost.

Brief description

Fig. 1 is a kind of open-celled structure schematic diagram of printed steel mesh of prior art.

Fig. 2 is the common u-shaped open-celled structure schematic diagram that prior art improves printed steel mesh indent.

Fig. 3 is a kind of open-celled structure schematic diagram of anti-tin sweat(ing) printed steel mesh of this utility model.

Specific embodiment

Below in conjunction with the accompanying drawings, preferably embodiment of the present utility model is described in further detail.

As shown in figure 3, a kind of open-celled structure of anti-tin sweat(ing) printed steel mesh, the open-celled structure of described anti-tin sweat(ing) printed steel mesh with The position of pad 1 corresponds to, the open-celled structure of described anti-tin sweat(ing) printed steel mesh include successively from side to opposite side the first perforate 2, Middle interconnecting piece 3 and the second perforate 4, the first connection side 31 that described middle interconnecting piece 3 includes being connected with the first perforate 2 and the Two perforate 4 connect second connection side 32, described first connect while 31, second connect while 32 be indent arc.Described first Connect 32 symmetrical the living apart in the both sides of described middle interconnecting piece 3 centrage when 31, second connects.Described first connection side 31st, second connects side 32 for semicircle, and the described first minimum range connecting when 31 are connected with second 32 is length of bonding pad 1/6 ~ 1/3, that is, the first connection the distance between 32 semi-circular top when 31 semi-circular top connects to second is pad The 1/6 ~ 1/3 of total length.

The specific embodiment of the above is better embodiment of the present utility model, not limits this practicality with this new Type be embodied as scope, scope of the present utility model includes being not limited to this specific embodiment, all according to this utility model Shape, the equivalence changes made of structure are all in protection domain of the present utility model.

Claims

1. a kind of open-celled structure of anti-tin sweat(ing) printed steel mesh it is characterised in that：The open-celled structure of described anti-tin sweat(ing) printed steel mesh with The position of pad corresponds to, and it includes the first perforate, middle interconnecting piece and the second perforate, described centre from side to opposite side successively Connecting portion includes the first connection being connected with the first perforate in the second connection being connected with the second perforate, described first connection While, second connect while be indent arc.

2. anti-tin sweat(ing) printed steel mesh according to claim 1 open-celled structure it is characterised in that：Described first connection side, Second connection symmetrical the living apart in the both sides of described middle interconnecting piece centrage in side.

3. anti-tin sweat(ing) printed steel mesh according to claim 2 open-celled structure it is characterised in that：Described first connection side, Second connects side for semicircle.

4. the anti-tin sweat(ing) printed steel mesh according to claim 1 ~ 3 any one open-celled structure it is characterised in that：Described One minimum range connecting when being connected with second is the 1/8 ~ 2/5 of length of bonding pad.

5. anti-tin sweat(ing) printed steel mesh according to claim 4 open-celled structure it is characterised in that：Described first connect side with The minimum range on the second connection side is the 1/6 ~ 1/3 of length of bonding pad.