TWI695551B - Conductive terminal and electrical connecting structure - Google Patents

Abstract

A conductive terminal includes a holding portion, a positioning portion and a welding portion. The positioning portion is connected to the holding portion and includes two positioning branches which is separated by a first trench. The welding portion is connected to the positioning portion and the positioning portion is located between the holding portion and the welding portion. The welding portion includes two welding branches which is separated by a second trench, wherein the first trench is communicated with the second trench and each of the welding branches is connected to one of the positioning branches. The positioning portion has a first outer diameter, and a second outer diameter on at least part of the welding portion is greater than the first outer diameter. An electrical connecting structure is further provided.

Description

Conductive terminal and electric connection structure

The invention relates to a terminal and connection structure, and in particular to a conductive terminal and electrical connection structure.

A common electrical connection structure includes a circuit board and conductive terminals soldered to the circuit board, wherein the circuit board has a through hole, and the conductive terminal is penetrated through the through hole. Further, the conductive terminal includes a cardioid holding portion for holding the core wire, and the cardioid holding portion penetrates the through hole. In the process of soldering the conductive terminal to the circuit board, the conductive terminal must be passed through the through hole of the circuit board, and the cardioid holding portion is roughly positioned in the through hole, and then, corresponding to the through hole cloth Solder, and then, the solder is heated so that the conductive terminals are joined to the circuit board through the solder.

However, due to an excessively large gap between the cardioid holding portion and the inner wall surface of the through hole, the cured solder is likely to generate holes such as pin holes, which will seriously affect the reliability of the electrical connection structure . For example, the occurrence of a pin hole will cause insufficient bonding strength between the conductive terminal and the circuit board, making the conductive terminal easily detach from the through hole, or the generation of a pin hole will cause The stability of the current or signal transmission between the conductive terminal and the circuit board is greatly reduced. At present, most of the disposal methods for pin holes are to fill the solder holes in the pin holes, but such disposal methods will cause lengthening of working hours, resulting in low process efficiency.

The present invention provides a conductive terminal, which helps to improve process yield and efficiency.

The invention provides an electrical connection structure, which has good reliability.

A conductive terminal according to an embodiment of the present invention includes a holding portion, a positioning portion, and a welding portion. The positioning part is connected to the holding part. The positioning part includes two positioning branches separated by a first groove. The welding part is connected to the positioning part, and the positioning part is located between the holding part and the welding part. The welding part includes two welding branches separated by a second groove, wherein the first groove communicates with the second groove, and each welding branch is connected to a positioning branch. The positioning portion has a first outer diameter, and at least a partial second outer diameter of the welded portion is larger than the first outer diameter.

In an embodiment of the invention, the above-mentioned welding portion includes a first extension segment connecting the positioning portion and a second extension segment connecting the first extension segment, and there is a turning point between the first extension segment and the second extension segment.

In an embodiment of the present invention, the welding portion described above gradually increases from the positioning portion toward the second outer diameter of the first extension section, and the welding portion rotates away from the first extension section toward the second outer diameter of the second extension section. The direction is decreasing.

In an embodiment of the invention, the second extension section of the above-mentioned welding portion has There is a distal end away from the turn, and the second outer diameter of the welding portion at the end is less than or equal to the first outer diameter of the positioning portion.

In an embodiment of the invention, the second outer diameter of the welding portion at the first extension and the turning is greater than the first outer diameter of the positioning portion.

In an embodiment of the invention, the above-mentioned conductive terminal further includes a limiting convex portion located between the positioning portion and the holding portion.

An electrical connection structure according to an embodiment of the invention includes a circuit board and conductive terminals. The circuit board has through holes. The conductive terminal includes a holding portion, a positioning portion, and a welding portion. The holding portion clamps the core wire. The positioning portion is connected to the holding portion, and penetrates the through hole. The positioning part includes two positioning branches separated by a first groove. The welding part is connected to the positioning part, and the positioning part is located between the holding part and the welding part. The soldering portion and the holding portion are located outside the through hole, and are located on opposite sides of the circuit board, respectively. The welding part includes two welding branches separated by a second groove, wherein the first groove communicates with the second groove, and each welding branch is connected to a positioning branch. The positioning portion has a first outer diameter, and at least a partial second outer diameter of the welded portion is larger than the first outer diameter.

In an embodiment of the invention, the above-mentioned limiting convex portion is located outside the through hole, and the soldering portion and the limiting convex portion are respectively located on opposite sides of the circuit board.

In an embodiment of the present invention, each of the positioning branches described above has an outer wall surface facing the inner wall surface of the through hole, and the ratio of the arc length of the outer wall surface of each positioning branch to the circumference of the inner wall surface of the through hole is greater than Equal to 40%.

In an embodiment of the invention, at least part of the first 2. The outer diameter is larger than the inner diameter of the through hole.

In an embodiment of the invention, the second extension of the welding portion has a distal end away from the turning, and the second outer diameter of the welding portion at the end is smaller than the inner diameter of the through hole.

Based on the above, the conductive terminals of the present invention are provided with grooves. In the process of installing and soldering the conductive terminals on the circuit board, the grooves can be used as the flow path of the solder, so as to make the solder filling more complete and avoid curing and molding The solder has holes, such as pin holes, which helps to improve the yield and efficiency of the process. In this way, not only can the bonding strength between the conductive terminal and the circuit board be improved, but also the stability of the current or signal transmission between the conductive terminal and the circuit board can be improved, so that the electrical connection structure of the present invention has good reliability.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

10: core wire

20: solder

100: electrical connection structure

110: circuit board

111: through hole

111a: inner wall surface

120: conductive terminal

121: Holding Department

122: Positioning Department

122a: locate branch

122b: outer wall surface

123: Welding Department

123a: Welding branch

1231: The first extension

1232: Second extension

1232a: end

1233: Turning Point

124: Groove

124a: the first groove

124b: second groove

125: limit protrusion

AX: central axis

D1: the first outer diameter

D2, D21, D22, D23: second outer diameter

I1: ID

FIG. 1A is a schematic diagram of an electrical connection structure according to an embodiment of the invention.

FIG. 1B is a schematic view of the electrical connection structure of FIG. 1A from another perspective.

2 is a disassembled schematic view of the electrical connection structure of FIG. 1A.

3A and 3B are schematic diagrams of the electrical connection structure of FIG. 1A on two different cross sections.

4 is a schematic diagram of the electrical connection structure of FIG. 3A after welding.

FIG. 1A is a schematic diagram of an electrical connection structure according to an embodiment of the invention. FIG. 1B is a schematic view of the electrical connection structure of FIG. 1A from another perspective. 2 is a disassembled schematic view of the electrical connection structure of FIG. 1A. Please refer to FIGS. 1A, 1B and 2, in this embodiment, the electrical connection structure 100 can be applied to various electronic devices, such as notebook computers, personal desktop computers, servers or power supplies, etc. Transmission current or signal. The electrical connection structure 100 may include a circuit board 110 and a conductive terminal 120, wherein the circuit board 110 may be a hard circuit board, a flexible circuit board, or a soft-hard composite circuit board, and has a through hole 111 for mounting the conductive terminal 120.

The conductive terminal 120 may be an integrally formed structure, and may be made of metal or alloy with good conductivity. Specifically, the conductive terminal 120 includes a holding portion 121, a positioning portion 122, and a welding portion 123, wherein the holding portion 121 is used to clamp the core wire 10, and the holding portion 121 may be a cardioid holding portion. On the other hand, the positioning portion 122 is connected to the holding portion 121 and extends from one side of the holding portion 121. The welding portion 123 is connected to the positioning portion 122, wherein the welding portion 123 extends from one side of the positioning portion 122, and the positioning portion 122 is located between the holding portion 121 and the welding portion 123.

3A and 3B are schematic diagrams of the electrical connection structure of FIG. 1A on two different cross sections. 4 is a schematic diagram of the electrical connection structure of FIG. 3A after welding. 1A, 1B, and 3A, after the conductive terminal 120 is installed in the through hole 111, the positioning portion 122 passes through the through hole 111, wherein the welding portion 123 and the holding portion 121 are located outside the through hole 111, and the welding portion 123 and the holding portion 121 are respectively located at two opposite sides of the circuit board 110 side. On the other hand, the core wire 10 is sandwiched by the holding portion 121, so the core wire 10 is also located outside the through hole 111. Further, the positioning portion 122 has a first outer diameter D1, wherein the first outer diameter D1 is slightly smaller than the inner diameter I1 of the through hole 111, and at least a portion of the second outer diameter D2 of the welding portion 123 is greater than the first outer diameter D1 and Inner diameter I1. Therefore, when the soldering portion 123 passes through the circuit board 110 and the positioning portion 122 passes through the through hole 111, if the soldering portion 123 is moved toward the circuit board 110, the soldering portion 123 may cause structural interference with the circuit board 110, so that the conductive terminal 120 will not easily escape from the through hole 111.

In this embodiment, the conductive terminal 120 is provided with a groove 124, wherein the groove 124 penetrates from the end of the welding portion 123 to the positioning portion 122 and stops before the holding portion 121. Specifically, the groove 124 can be roughly divided into a first groove 124a and a second groove 124b that are in communication, wherein the first groove 124a divides the positioning portion 122 into two separate positioning branches 122a, and The second groove 124b divides the welding portion 123 into two divided welding branches 123a. The two positioning branches 122a and the two welding branches 123a adopt a one-to-one configuration, that is, each welding branch 123a is connected to a positioning branch 122a.

In the process of installing and soldering the conductive terminal 120 to the circuit board 110, the groove 124 can be used as a flow path of the solder 20, so that the solder 20 can be filled more completely, and avoid the formation of holes such as tin in the solder 20 after curing. Holes (pin holes), so it helps to improve process yield and efficiency, as shown in Figure 3A and Figure 4. In this way, not only can the bonding strength between the conductive terminal 120 and the circuit board 110 be improved, but also the stability of the current or signal transmission between the conductive terminal 120 and the circuit board 110 can be improved, so that the electrical connection structure 100 of the present invention has Good reliability.

As shown in FIGS. 3A and 4, the solder 20 completely covers the soldering portion 123 and the positioning portion 122. The solder 20 not only fills the through hole 111 and the groove 124, but also fills the holding portion 121 to cover the core wire 10 . Therefore, the bonding area and bonding strength of the conductive terminal 120 and the solder 20 can be greatly improved.

Referring to FIG. 3A, the welding portion 123 includes a first extension 1231 connecting the positioning portion 122 and a second extension 1232 connecting the first extension 1231, and there is a turning 1233 between the first extension 1231 and the second extension 1232 . Specifically, the conductive terminal 120 has a hollow structure, wherein the conductive terminal 120 has a central axis AX, and both the first extension 1231 and the second extension 1232 are inclined to the center axis AX. In this embodiment, the second outer diameter D21 of the welding portion 123 at the first extension 1231 gradually increases from the positioning portion 122 toward the turning 1233, wherein the second outer diameter D22 of the welding portion 123 at the turning 1233 is greater than the second outer diameter D21 . On the other hand, the second outer diameter D22 and the second outer diameter D21 can be regarded as a part of the second outer diameter D2 and are larger than the inner diameter I1 of the through hole 111 and the first outer diameter D1 of the positioning portion 122.

Following the above, the maximum outer diameter of the welding portion 123 substantially falls at the turning 1233, and the second outer diameter D23 of the welding portion 123 at the second extension 1232 gradually decreases from the turning 1233 away from the first extension 1231. In other words, the outer diameter of the welding portion 123 of the conductive terminal 120 gradually increases from the end 1232a of the second extension 1232 to the turning 1233, and gradually decreases from the turning 1233 to the positioning portion 122. This outer diameter design facilitates the insertion of the conductive terminal 120 to The process of the circuit board 110 is performed.

Further, the second extension 1232 of the welding portion 123 is guided forward In the structure, the second outer diameter D23 of the second extension 1232 at the end 1232a is smaller than or equal to the first outer diameter D1 of the positioning portion 122, and the second outer diameter D23 of the second extension 1232 at the end 1232a is smaller than the through hole 111 The inner diameter I1. Therefore, during the process of passing the soldering portion 123 through the through hole 111, the end 1232a of the soldering portion 123 does not interfere with the circuit board 110 or the through hole 111, and the outer diameter of the soldering portion 123 is from the second extension 1232 The end 1232a gradually increases to the turning 1233, and as the depth of the welding portion 123 penetrating into the through hole 111 increases, the welding portion 123 can be elastically deformed due to the groove 124, so that the welding portion 123 can smoothly pass through the through hole 111. After the welding portion 123 passes through the through hole 111, the welding portion 123 elastically returns to the state before being deformed without force, and the positioning portion 122 is penetrated through the through hole 111.

1A, 1B, and 3B, in this embodiment, each positioning branch 122a of the positioning portion 122 has an outer wall surface 122b facing the inner wall surface 111a of the through hole 111, and the outer wall surface of each positioning branch 122a The ratio of the arc length of 122b to the circumference of the inner wall surface 111a of the through hole 111 is 40% or more. Accordingly, if the positioning portion 122 is offset in the through hole 111, the pushing action of the two positioning branches 122a and the inner wall surface 111a of the through hole 111 can drive the positioning portion 122 to reset, so that the positioning portion 122 is substantially maintained at The center of the through hole 111.

1A, 1B, and 2, the conductive terminal 120 further includes a limiting protrusion 125, wherein the limiting protrusion 125 is located between the positioning portion 122 and the holding portion 121, and the number of the limiting protrusion 125 may be two , Or increase or decrease according to design needs. After the positioning portion 122 is inserted into the through hole 111, the limiting convex portion 125 can play the role of stopping, preventing The retaining portion 121 penetrates into the through hole 111. At this time, the limiting convex portion 125 is located outside the through hole 111, and the soldering portion 123 and the limiting convex portion 125 are located on opposite sides of the circuit board 110, respectively.

In particular, the number of positioning branches 122a of the positioning portion 122 is the same as the number of welding branches 123a of the welding portion 123, wherein the number of positioning branches 122a and the number of welding branches 123a of the welding portion 123 are at least two, and these The positioning branches 122a and the soldering portions 123 are arranged in a symmetrical arrangement, an equidistant arrangement, or a circular arrangement based on the central axis AX of the conductive terminal 120 as a reference.

In summary, the conductive terminals of the present invention are provided with grooves. In the process of installing and soldering the conductive terminals to the circuit board, the grooves can be used as the flow path of the solder, so as to make the solder filling more complete and avoid curing The formed solder has holes, such as pin holes, which helps to improve the yield and efficiency of the process. In this way, not only can the bonding strength between the conductive terminal and the circuit board be improved, but also the stability of the current or signal transmission between the conductive terminal and the circuit board can be improved, so that the electrical connection structure of the present invention has good reliability.

On the other hand, since the outer diameter of the soldering portion of the conductive terminal of the present invention gradually increases from the end to the turn, and gradually decreases from the turn to the positioning portion, this outer diameter design facilitates the process of inserting the conductive terminal to the circuit board. Furthermore, since at least a part of the second outer diameter of the soldered portion is larger than the inner diameter of the through hole, when the soldered portion passes through the circuit board and the positioning portion is threaded through the through hole, if the soldered portion is moved toward the circuit board, the soldered portion There will be structural interference with the circuit board, so that the conductive terminal will not easily escape from the through hole. In addition, the ratio of the arc length of the outer wall surface of each positioning branch of the positioning portion to the circumference of the inner wall surface of the through hole The rate is greater than or equal to 40%. If the positioning portion is offset in the through hole, the pushing effect of the two positioning branches and the inner wall surface of the through hole can drive the positioning portion to reset, so that the positioning portion is substantially maintained at the center of the through hole .

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

10: core wire

100: electrical connection structure

110: circuit board

111: through hole

120: conductive terminal

121: Holding Department

123: Welding Department

123a: Welding branch

124: Groove

124b: second groove

Claims (15)

A conductive terminal includes: a holding portion; a positioning portion connected to the holding portion, the positioning portion including two positioning branches separated by a first groove; and a welding portion connected to the positioning portion, and the positioning portion is located Between the holding portion and the welding portion, the welding portion includes two welding branches separated by a second groove, wherein the first groove communicates with the second groove, and the second groove The width is greater than the width of the first groove, and each welding branch is connected to the positioning branch, wherein the positioning portion has a first outer diameter, and at least a partial second outer diameter of the welding portion is greater than the first outer diameter . The conductive terminal as described in item 1 of the patent application range, wherein the welding portion includes a first extension connecting the positioning portion and a second extension connecting the first extension, and the first extension and the second There is a turning point between the extensions. The conductive terminal according to item 2 of the patent application scope, wherein the second outer diameter of the welding portion at the first extension section gradually increases from the positioning portion toward the turning, and the welding portion at the second extension section The two outer diameters gradually decrease from the turning direction away from the first extending section. The conductive terminal as described in item 2 of the patent application range, wherein the second extension of the welding portion has an end away from the turning point, and the second outer diameter of the welding portion at the end is less than or equal to that of the positioning portion The first outer diameter. The conductive terminal as described in item 2 of the patent application scope, wherein the second outer diameter of the welding portion at the first extension and the turning is greater than the first outer diameter of the positioning portion. The conductive terminal as described in item 1 of the patent application scope further includes: a limiting convex portion, located between the positioning portion and the holding portion. An electrical connection structure includes: a circuit board having a through hole; and a conductive terminal, including: a holding portion that clamps a core wire; a positioning portion that connects the holding portion and penetrates the through hole, the positioning portion includes a first Two positioning branches separated by a groove; and a welding portion connected to the positioning portion, and the positioning portion is located between the holding portion and the welding portion, the welding portion and the holding portion are located outside the through hole, and Located on opposite sides of the circuit board respectively, the soldering portion includes two soldering branches separated by a second trench, wherein the first trench is in communication with the second trench, and the The width is greater than the width of the first groove, and each welding branch is connected to the positioning branch, wherein the positioning portion has a first outer diameter, and at least a partial second outer diameter of the welding portion is greater than the first outer diameter . The electrical connection structure as described in item 7 of the patent application range, wherein the welding portion includes a first extension segment connecting the positioning portion and a second extension segment connecting the first extension segment, and the first extension segment and the first extension segment There is a turning point between the two extensions. The electrical connection structure as described in item 8 of the patent application range, wherein the second outer diameter of the welded portion at the first extension section gradually increases from the positioning portion toward the turn, and the welded portion at the second extension section The second outer diameter gradually decreases from the turning direction away from the first extending section. The electrical connection structure as described in item 8 of the patent application range, wherein the second extension of the welding portion has an end away from the turning point, and the second outer diameter of the welding portion at the end is less than or equal to the positioning portion The first outer diameter. The electrical connection structure as recited in item 8 of the patent application range, wherein the second outer diameter of the welded portion and the turning at the first extension is greater than the first outer diameter of the positioning portion. The electrical connection structure as described in item 8 of the patent application range, wherein the second extension of the welded portion has a distal end away from the turn, and the second outer diameter of the welded portion at the end is smaller than the inside of the through hole path. The electrical connection structure as described in item 7 of the patent application range, wherein the conductive terminal further includes a limiting convex portion located between the positioning portion and the holding portion, the limiting convex portion is located outside the through hole, and the welding The portion and the limiting convex portion are respectively located on opposite sides of the circuit board. The electrical connection structure as described in item 7 of the patent application scope, wherein each of the positioning branches has an outer wall surface facing the inner wall surface of the through hole, and the arc length of the outer wall surface of each of the positioning branches and the through hole The ratio of the circumference of the inner wall surface is greater than or equal to 40%. The electrical connection structure according to item 7 of the patent application scope, wherein at least a part of the second outer diameter of the welded portion is larger than the inner diameter of the through hole.

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