CN206098798U - Connector - Google Patents

Abstract

The utility model discloses a connector, which comprises: an insulating body; conductive terminals held in the insulating body; and solder balls welded to the corresponding conductive terminals. The conductive terminal includes a fixing part, a welding pad, and a connecting root part that connects the welding pad to the fixing part and bends downward. A pit is formed on the top surface of the welding pad, and the solder ball Adapted to be positioned and welded in said pocket. The conductive terminal also includes a downwardly bent free end connected to the solder pad. In the present invention, when the solder ball positioned in the pit is in a molten liquid state, the connection root and the free end of the conductive terminal will pull the solder ball from both sides of the solder ball in opposite directions at the same time, so that the center of the solder ball More towards the center of the dimple of the conductive terminal, thus improving the positional accuracy of the solder ball on the connector.

Description

Connector

technical field

The utility model relates to a connector, in particular to a ball grid array connector.

Background technique

In the prior art, a Ball Grid Array (BGA) connector generally includes an insulating body, a plurality of conductive terminals held in the insulating body, and a plurality of solder balls ( usually solder balls). In the prior art, each conductive terminal includes a fixing part fixed in the insulating body, a welding pad and a connecting root part connecting the welding pad to the fixing part. Usually, the welding pad extends along the horizontal direction, the fixing part extends along the vertical direction, and the connection root is a connecting transition section, which bends downward from the welding pad and extends to the fixing part.

In the prior art, a dimple is formed on the top surface of the solder pad, and the solder ball is adapted to be positioned and soldered in the dimple. In the prior art, the solder balls are generally welded into the pits of the solder pads by thermal melting. First, it is necessary to place solid solder balls into the pits of the solder pads, then heat the solder balls to melt and fuse with the solder pads (please note that the melting point of the solder balls is much lower than that of the conductive terminals), Finally, the solder balls cool and solidify.

However, in the prior art, when the solder balls positioned in the dimples of the solder pads are in a molten liquid state, the aforementioned connection roots will apply surface tension to the solder balls, causing the solder balls to be pulled toward the roots, which will result in a liquid state. The solder ball will be biased towards the connection root as a whole, so that the center of the solder ball will deviate from the center of the crater of the solder pad, reducing the accuracy of the position of the solder ball on the connector.

Utility model content

The purpose of this utility model is to solve at least one aspect of the above-mentioned problems and defects existing in the prior art.

According to one aspect of the present invention, there is provided a connector, comprising: an insulating body; conductive terminals held in the insulating body; and solder balls soldered to corresponding conductive terminals. The conductive terminal includes a fixing part, a welding pad, and a connecting root part that connects the welding pad to the fixing part and bends downward. A pit is formed on the top surface of the welding pad, and the solder ball Adapted to be positioned and welded in said pocket. The conductive terminal also includes a downwardly bent free end connected to the solder pad.

According to an embodiment of the present invention, the size and the downward bending angle of the free end are set such that when the solder ball positioned in the dimple is in a molten liquid state, the free end The surface tension applied to the solder ball is the same in magnitude but opposite in direction to the surface tension applied to the solder ball by the connection root, so that the center of the solder ball is located at the center of the pit.

According to another embodiment of the present invention, the free end portion and the connection root portion are symmetrically arranged on two sides of the welding pad.

According to another embodiment of the present invention, the welding pads extend along the horizontal direction, and the top surfaces of the welding pads are exposed from the top of the insulating body.

According to another embodiment of the present invention, the fixing part extends along the vertical direction and is fixed in the insulating body.

According to another embodiment of the present invention, the conductive terminal further includes an elastic arm, the elastic arm is connected to the lower end of the fixing part, and an elastic contact part is formed on the end of the elastic arm.

According to another embodiment of the present invention, the elastic arm extends obliquely downward from the fixing portion, and the elastic contact portion of the elastic arm is exposed from the bottom of the insulating body.

According to another embodiment of the present invention, the connector includes a plurality of conductive terminals and a plurality of solder balls, and the plurality of solder balls are welded to the pits of the solder pads of the plurality of conductive terminals respectively. middle.

According to another embodiment of the present invention, the connector is a ball grid array connector, and the plurality of solder balls on the ball grid array connector are distributed in an array.

In each of the foregoing embodiments according to the present invention, when the solder ball positioned in the dimple is in a molten liquid state, the connection root and the free end of the conductive terminal pull the solder ball from both sides of the solder ball in opposite directions simultaneously. , so that the center of the solder ball is closer to the center of the pit of the conductive terminal, thereby improving the position accuracy of the solder ball on the connector.

Through the following description of the utility model with reference to the accompanying drawings, other purposes and advantages of the utility model will be apparent, and can help to have a comprehensive understanding of the utility model.

Description of drawings

Fig. 1 shows a partial sectional view of a connector according to an embodiment of the present invention;

Fig. 2 shows a schematic perspective view of a conductive terminal of the connector shown in Fig. 1; and

FIG. 3 shows a perspective view of a conductive terminal and a corresponding solder ball of the connector shown in FIG. 1 .

detailed description

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals designate the same or similar components. The following descriptions of the embodiments of the utility model with reference to the accompanying drawings are intended to explain the overall utility model concept of the utility model, and should not be construed as a limitation of the utility model.

In addition, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a comprehensive understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in diagrammatic form to simplify the drawings.

According to a general technical concept of the present invention, a connector is provided, comprising: an insulating body; conductive terminals held in the insulating body; and solder balls welded to corresponding conductive terminals. The conductive terminal includes a fixing part, a welding pad, and a connecting root part that connects the welding pad to the fixing part and bends downward. A pit is formed on the top surface of the welding pad, and the solder ball Adapted to be positioned and welded in said pocket. The conductive terminal also includes a downwardly bent free end connected to the solder pad.

Fig. 1 shows a partial sectional view of a connector according to an embodiment of the present utility model; Fig. 2 shows a schematic perspective view of a conductive terminal 100 of the connector shown in Fig. 1; and Fig. 3 shows one of the connector shown in Fig. 1 A three-dimensional schematic diagram of a conductive terminal 100 and a corresponding solder ball 200 .

As shown in FIG. 1 , FIG. 2 and FIG. 3 , in the illustrated embodiment, the connector mainly includes: an insulating body 300 , conductive terminals 100 and solder balls 200 . The conductive terminal 100 is held in the insulating body 300 . Solder balls 200 are soldered to corresponding conductive terminals 100 .

As shown in FIGS. 1 , 2 and 3 , in the illustrated embodiment, the conductive terminal 100 includes a fixing portion 130 , a soldering pad 110 and a downwardly bent connection root 111 connecting the soldering pad 110 to the fixing portion 130 . A dimple 113 is formed on the top surface of the solder pad 110 , and the solder ball 200 is adapted to be positioned and soldered in the dimple 113 .

In one embodiment of the present invention, as shown in FIG. 1 , FIG. 2 and FIG. 3 , the conductive terminal 100 further includes a free end portion 112 bent downwards connected to the welding pad 110 . In this way, in the process of soldering the solder ball 200 to the welding pad 110 of the conductive terminal 100, when the solder ball 200 positioned in the recess 113 is in a molten liquid state, the connection root 111 and the free end of the conductive terminal 100 The portion 112 will pull the solder ball 200 from both sides of the solder ball 200 in opposite directions at the same time, so that the center of the solder ball 200 is closer to the center of the recess 113 of the conductive terminal 100, thereby improving the position of the solder ball 200 on the connector. precision.

In one embodiment of the present invention, the center of the solder ball 200 after soldering can be located at the center of the crater 113 of the conductive terminal 100 by adjusting the size of the free end 112 and the downward bending angle.

In one embodiment of the present invention, the size and the downward bending angle of the free end 112 of the conductive terminal 100 are set such that when the solder ball 200 positioned in the dimple 113 is in a molten liquid state, the free end The surface tension applied by 112 to the solder ball 200 is the same in magnitude but opposite to the surface tension applied by the root portion 111 to the solder ball 200 , so that the center of the solder ball 200 is located at the center of the pit 113 .

In one embodiment of the present invention, as shown in FIG. 1 , FIG. 2 and FIG. 3 , the free end portion 112 and the connecting root portion 111 are symmetrically arranged on both sides of the welding pad 110 . In this way, when the solder ball 200 positioned in the crater 113 is in a molten liquid state, the surface tension applied to the solder ball 200 by the free end 112 is the same in magnitude but opposite to the surface tension applied by the connection root 111 to the solder ball 200, thereby The center of the solder ball 200 can be precisely located at the center of the dimple 113 .

As shown in FIG. 1 , FIG. 2 and FIG. 3 , in the illustrated embodiment, the soldering pad 110 extends along the horizontal direction, and the top surface of the soldering pad 110 is exposed from the top of the insulating body 300 .

As shown in FIG. 1 , FIG. 2 and FIG. 3 , in the illustrated embodiment, the fixing portion 130 extends vertically and is fixed in the insulating housing 300 .

As shown in FIGS. 1 , 2 and 3 , in the illustrated embodiment, the conductive terminal 100 further includes an elastic arm 120 , the elastic arm 120 is connected to the lower end of the fixing portion 130 , and formed on the end of the elastic arm 120 The elastic contact part 121 .

As shown in FIG. 1 , FIG. 2 and FIG. 3 , in the illustrated embodiment, the elastic arm 120 extends obliquely downward from the fixing portion 130 , and the elastic contact portion 121 of the elastic arm 120 is exposed from the bottom of the insulating housing 300 .

As shown in Fig. 1, Fig. 2 and Fig. 3, in the illustrated embodiment, the connector includes a plurality of conductive terminals 100 and a plurality of solder balls 200, and a plurality of solder balls 200 are respectively welded on the solder joints of the plurality of conductive terminals 100. In the dimple 113 of the pad 110.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , in the illustrated embodiment, the connector is a ball grid array connector, and a plurality of solder balls 200 on the ball grid array connector are distributed in an array. However, please note that the connector of the present invention is not limited to the BGA connector shown in the figure, and may also be other types of connectors with solder balls.

Those skilled in the art can understand that the above-described embodiments are exemplary, and those skilled in the art can improve them, and the structures described in various embodiments do not conflict with each other in terms of structure or principle Can be combined freely.

Although the utility model has been described in conjunction with the drawings, the embodiments disclosed in the drawings are intended to illustrate the preferred implementation of the utility model, and should not be construed as a limitation of the utility model.

While certain embodiments of the present general inventive concept have been shown and described, those of ordinary skill in the art will appreciate that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the present invention The scope of the utility model is defined by the claims and their equivalents.

It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. Additionally, any element references in the claims should not be construed as limiting the scope of the present invention.

Claims (9)

1. A connector, comprising: insulating body (300); a conductive terminal (100), held in said insulating body (300); and Solder balls (200), soldered to corresponding conductive terminals (100), in, The conductive terminal (100) includes a fixing part (130), a welding pad (110), and a downwardly bent connection root part (111) connecting the welding pad (110) to the fixing part (130), a dimple (113) is formed on the top surface of said solder pad (110), said solder ball (200) is adapted to be positioned and soldered in said dimple (113), It is characterized by: The conductive terminal (100) also includes a downwardly bent free end portion (112) connected to the solder pad (110). 2. The connector according to claim 1, characterized in that the size of the free end (112) and the downward bending angle are set to: When the solder ball (200) positioned in the dimple (113) is in a molten liquid state, the surface tension exerted by the free end (112) on the solder ball (200) has the same effect as that of the connection root (111) Surface tensions applied to the solder balls (200) are equal in magnitude but opposite in direction, so that the centers of the solder balls (200) are located at the centers of the pits (113). 3. The connector according to claim 1, characterized in that: The free end portion (112) and the connection root portion (111) are symmetrically arranged on both sides of the welding pad (110). 4. The connector according to claim 1, characterized in that: The welding pad (110) extends along the horizontal direction, and the top surface of the welding pad (110) is exposed from the top of the insulating body (300). 5. The connector according to claim 4, characterized in that: The fixing part (130) extends along the vertical direction and is fixed in the insulating body (300). 6. The connector according to claim 5, characterized in that: The conductive terminal (100) also includes an elastic arm (120), the elastic arm (120) is connected to the lower end of the fixing part (130), and an elastic contact is formed on the end of the elastic arm (120). Department (121). 7. The connector according to claim 6, characterized in that: The elastic arm (120) extends obliquely downward from the fixing portion (130), and the elastic contact portion (121) of the elastic arm (120) is exposed from the bottom of the insulating body (300). 8. The connector according to claim 1, characterized in that: The connector includes a plurality of conductive terminals (100) and a plurality of solder balls (200), and a plurality of solder balls (200) are respectively welded on soldering pads ( 110) in the pit (113). 9. The connector according to claim 8, characterized in that: The connector is a ball grid array connector, and a plurality of solder balls (200) on the ball grid array connector are distributed in an array.