CN2671158Y - Electrical connectors with surface mount conductive terminals - Google Patents

Abstract

An electric connector of surface-adhered conductive terminal is prepared as setting multiple terminal channels on insulation shell, setting a stop part on internal wall surface of each terminal channel, setting a joint part, a welding part and a positioning part between joint part and welding part on each conductive terminal, forming welding part in inverse hook shape, interfering and blocking each other between positioning part and stop part when conductive terminal is inserted into corresponding terminal channel, projecting welding part out of insulation shell to let inverse hook shaped welding part be able to be welded on circuit board directly by surface adhesion mode instead of tin ball.

Description

Electrical connectors with surface mount conductive terminals

technical field

The utility model relates to an electric connector, in particular to an electric connector whose internal conductive terminals can be welded on a circuit board by a surface adhesion method (SMT) without implanting tin balls.

Background technique

For a highly dense chip such as a central processing unit, the number of pins for external signal output and input is quite large, so most of the pins are densely arranged in a pin grid array (PGA), and the matched electrical connections The connector is like the common zero-insertion force electrical connector on the motherboard of a general computer. The CPU chip and the circuit board are connected by an electrical connector to transmit electrical signals.

As shown in Figures 1 and 2, a general zero-insertion force electrical connector 3 mainly includes a base 32, a moving seat 31 assembled on the surface of the base 32, and a seat between the base 32 and the moving seat 31. There is a driving member 33 used to drive the moving base 31 to move horizontally on the surface of the base 32 . Wherein, the surface of the moving base 31 is also provided with jacks 311 arranged in a matrix in accordance with the number of pins 41 of a CPU chip 4 . Of course, the base 12 also has terminal passages 321 corresponding to the sockets 311, and a conductive terminal 34 is correspondingly inserted in each terminal passage 321, and an end of each conductive terminal 34 close to the movable seat 31 forms a joint portion 341, and The other end forms a soldering portion 342 on the bottom surface of the base 32 for electrical connection with a circuit board (not shown).

When the electrical connector 3 was assembled with the central processing unit chip 4, the central processing unit chip 4 was placed on the surface of the movable seat 31, and the pins 41 extending downwards from the bottom of the chip 4 were inserted into the corresponding jacks 311, and then stretched into In the terminal channel 321, when the user pulls the driving member 33 to cause the relative displacement of the moving seat 31 on the upper surface of the base 32, the pins 41 of the chip 4 are forced to contact with the joint portion 341 of the conductive terminal 34 in the terminal channel 321. , so as to achieve the function of electrical connection between the CPU chip 4 and the circuit board. Since the structure of the zero-insertion-force electrical connector 3 is a well-known technology that is widely used, it will not be described in detail here.

In the past, the conductive terminal 34 of the zero insertion force electrical connector 3 is welded to the circuit board by surface mount method (SMT).

As shown in FIG. 2 , the welding portion 342 of the conductive terminal 34 is pre-pressed into a fork-shaped or concave-shaped socket for implanting a solder ball 343, and the corresponding circuit board surface only needs to be reserved and have a solder layer. Just connect (pad). During welding, the solder balls 343 of the soldering parts 342 of the conductive terminals 34 on the electrical connector 3 are aligned and contact the corresponding contact positions, and after the electrical connector 3 and the circuit board are welded together, the welding of the conductive terminals 34 can be completed. The portion 342 is soldered and fixed on the corresponding pad in a surface-adhesive manner. This method is beneficial to the utilization of the space on the circuit board, and the distance between the pads can be reduced and denser, so that the electrical connector 3 can be designed towards the market trend of thinner and smaller. But this connector also has defects, one of which is due to the use of solder balls 343 welding, so the length of the conductive terminal 34 is relatively short, and the distance between the solder ball 343 and the joint portion 341 of the conductive terminal 34 is also relatively close. When the solder ball 343 is melted during operation, the tin liquid will climb upward along the conductive terminal 34 due to the surface contact force, so that part of the tin liquid may accumulate on the joint portion 341 of the conductive terminal 34. When the moving seat 31 of the electrical connector 3 drives When the central processing unit chip 4 moves, the solder accumulated on the joint portion 341 of the conductive terminal 34 will prevent the pin 41 of the chip 4 from entering the joint portion 341, and even bend the pin 41, so that the central processing unit chip 4 is broken due to poor contact. become waste. In addition, due to the poor conductivity of the solder ball 343 between the conductive terminal 34 and the circuit board, the signal conduction resistance will increase compared with the copper-based wire, and noise will be generated when it is used to conduct high-frequency signals. , which reduces the reliability of signal transmission.

Contents of the invention

The purpose of the utility model is to provide an electrical connector with conductive terminals that can be surface-adhesive without solder balls.

In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: the electrical connector is electrically connected to a circuit board, and is used for plugging an electronic component with a plurality of pins. The electrical connector includes an insulating shell and a plurality of conductive terminals.

The insulating housing has a first surface for bonding of electronic components and a second surface close to the circuit board. The insulating housing is provided with a plurality of terminal passages, and each terminal passage forms a first opening on the first surface and the second surface respectively. And a second opening, a locking part located in the terminal channel is further provided on the inner wall of the terminal channel, the locking part is located in the terminal channel and forms a necking part with a channel cross-sectional area smaller than that of the first opening and the second opening .

Each conductive terminal has a joint part, a welding part and a positioning part located between the joint part and the welding part, the welding part is formed into a barb shape, and each conductive terminal can be inserted into the corresponding terminal alternatively through the first opening and the second opening In the channel, the conductive terminal is partially passed through the constricted part, and the positioning part and the locking part interfere with each other to force the conductive terminal to be positioned in the terminal channel, and the joint part is located close to the first opening for the contact of the pin of the electronic component , the soldering portion protrudes from the second surface of the insulating housing, and all the soldering portions forming the barb shape are on the same plane, so as to replace the solder balls and be directly soldered to the circuit board by surface adhesion.

Due to the application of the above-mentioned technical solutions, the utility model has the following advantages compared with the prior art:

1. Good electrical conductivity. Since there is no need to use solder balls for surface adhesion, it is directly soldered to the corresponding contacts of the circuit board, so there is no resistance problem caused by solder balls and tin materials in electrical conduction, so it not only maintains the advantages of dense conductive terminals of the surface mount process, It is more suitable for transmitting relatively high frequency electronic signals without generating noise. In addition, there is no problem of tin material climbing along the conductive terminal and accumulating on the joint portion of the conductive terminal during the soldering operation, so there is no disadvantage of affecting the electrical contact between the pins of the chip and the joint portion of the conductive terminal.

2. It can be recycled and remanufactured. Because the conductive terminal is directly soldered to the pad of the circuit board by its soldering part, once the soldering part and the contact are out of alignment, it only needs to be reheated to make the soldering part of the conductive terminal and the corresponding pad of the circuit board It can be recycled and remanufactured after detachment, without the disadvantage that the electrical connector cannot be recycled and remanufactured once the solder ball is damaged due to soldering failure, which can greatly reduce the occurrence rate of waste products and the cost of materials.

3. The production cost is low. Compared with the previous manufacturing process in which solder balls had to be implanted into the electrical connector, the utility model only needs to bend the welding part of the conductive terminal into a barb shape to be welded with the circuit board, so the conductive terminal is implanted with tin Compared with the process of processing and bending the welding part of the conductive terminal, the production cost of this solution is obviously relatively low.

Description of drawings

Accompanying drawing 1 is a perspective view of the structure of a zero insertion force electrical connector;

Accompanying drawing 2 is a schematic cross-sectional structural diagram of the electrical connector in Figure 1, which illustrates that the bottom surface of the electrical connector has a plurality of solder balls;

Accompanying drawing 3 is the three-dimensional cut-away exploded view of partial structure of a preferred embodiment of the electric connector of the present invention. In the figure, a conductive terminal is inserted into a terminal channel of a base from above and the welding part of the conductive terminal forms a semi-conductive structure. ring shape;

Accompanying drawing 4 is the side structure sectional schematic diagram of structure shown in Fig. 3;

Accompanying drawing 5 is the three-dimensional exploded view of the partial structure of the preferred embodiment, in which a conductive terminal is inserted into a base terminal channel from below;

Accompanying drawing 6 is the schematic sectional view of the side structure of the structure shown in Figure 5;

Accompanying drawing 7 is the structural schematic diagram of another preferred embodiment of the conductive terminal of the present invention, in which the welding part of the conductive terminal forms a ring shape;

Accompanying drawing 8 is a structural schematic diagram of another preferred embodiment of the conductive terminal of the present invention, in which the welding part of the conductive terminal forms a W-shaped form;

Accompanying drawing 9 is a structural schematic diagram of another preferred embodiment of the conductive terminal of the present invention, in which the welding part of the conductive terminal forms a rectangular shape;

Accompanying drawing 10 is a structural schematic diagram of another preferred embodiment of the conductive terminal of the present invention, in which the welding part of the conductive terminal forms a triangular shape;

Accompanying drawing 11 is the structure diagram of another preferred embodiment of the conductive terminal of the present invention, in which the welding part of the conductive terminal forms a horizontal linear form;

Figure 12 is a schematic structural diagram of another preferred embodiment of the conductive terminal of the present invention, in which the welding part of the conductive terminal forms a trapezoidal shape.

In the above drawings: 1. Electrical connector; 12. Base; 121. First surface; 122. Second surface; 123. Terminal channel; 1231. First opening; 1232. Second opening; 1233. Neck constriction ; 124, locking part; 125, blocking part; 2, conductive terminal; 21, joint part; 22, welding part; 23, positioning part; 24, wing part; 3, electrical connector; , socket; 32, base; 321, terminal channel; 33, driver; 34, conductive terminal; 341, junction; 342, soldering portion; 343, solder ball; 4, chip;

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Referring to Fig. 3 and Fig. 4, this embodiment, as a preferred embodiment of the electrical connector, is described as a zero-insertion force electrical connector 1, which has an insulating housing made of an insulating material, such as the known The structure of the zero insertion force electrical connector is the same, including a base 12, the base 12 has a first surface 121 located above and a second surface 122 located below, and a plurality of them are arranged in the base 12. The surface 121 is connected to the terminal passage 123 of the second surface 122, and the terminal passage 123 forms a first opening 1231 and a second opening 1232 on the first surface 121 and the second surface 122 respectively, further on the inner wall surface of the terminal passage 123. There is a locking part 124 located in the terminal channel 123. In this embodiment, the locking part 124 is a rib protruding from the inner wall of the terminal channel 123, so that the locking part 124 forms a channel section in the terminal channel 123. The area of the constricted portion 1233 is smaller than that of the first opening 1231 and the second opening 1232 .

Each conductive terminal 2 has a joint portion 21, a welding portion 22, and a positioning portion 23 located between the joint portion 21 and the welding portion 22. In this example, the joint portion 21 uniformly forms a relatively elastically expandable clamp structure. The welding portion 22 is bent in advance by machining to form a barbed semicircular shape. In addition, the positioning portion 23 forms a concave shape on the side material of the conductive terminal 2 corresponding to the rib of the locking portion 124 of the base 12 .

During assembly, the conductive terminal 2 can be assembled in two ways, one is to insert into the corresponding terminal channel 123 from the first opening 1231 , and the other is to insert into the corresponding terminal channel 123 from the second opening 1232 . Both assembling methods must make part of the material of the conductive terminal 2 pass through the constricted part 1233, so that the joint part 23 is located in the terminal channel 123 close to the first opening 1231, and the welding part 22 protrudes from the second part under the base 12. face 122 exterior.

3 and 4, when the conductive terminal 2 is inserted into the terminal channel 123 from the first opening 1231, the soldering portion 22 of the conductive terminal 2 first enters through the first opening 1231, and then passes through the constricted portion 1233 to move During the process, after the materials on both sides of the conductive terminal 2 are slightly elastically deformed, the concave positioning part 23 will be engaged with the locking part 124 formed in the terminal channel 123 to form a convex rib, and then the conductive terminal 2 and the terminal channel 123 will be fixed. relative position. In order to further increase the convenience of assembling and positioning the conductive terminals 2 in the terminal channels 123, the base 12 of the insulating housing is provided with a protruding hole on the two inner sides opposite to each terminal channel 123 and close to the second surface 122. stopper 125 . Corresponding to the design of the stopper 125, the conductive terminal 2 forms an outwardly protruding wing 24 on opposite sides. The movement produces a limiting effect, preventing the conductive terminal 2 from continuing to move downward after the positioning portion 23 engages with the locking portion 124 , which can further increase the positioning effect.

As shown in Figure 5 and Figure 6, with the same assembly principle, when the conductive terminal 2 is inserted into the terminal channel 123 from the second opening 1232, the joint portion 21 of the conductive terminal 2 enters through the second opening 1232 first, and then passes through the neck. The constricted portion 1233 is further formed by the concave positioning portion 23 of the conductive terminal 2 engaging the convex locking portion 124 in the terminal channel 123 to form a positioning. Similarly, the base 12 can also be provided with a stop portion 125, and the conductive terminal 2 can be provided with a wing portion 24, but the difference from the above-mentioned assembly method in which the conductive terminal 2 enters the terminal channel 2 through the first opening 1231 is that the stop portion 125 Changing the position close to the first surface 121 to match the direction in which the conductive terminal 2 is inserted into the terminal channel 123 has the same effect as the above assembly method, and will not be described here.

In this way, after the conductive terminals 2 are respectively positioned in the corresponding terminal passages 123, the barb-shaped welding portion 22 formed by the conductive terminals 2 can provide a bottom surface for soldering with the circuit board like a solder ball, and if necessary, the bottom surface It is also possible to attach a solder layer in advance, but the shape of the barb is actually not certain. The designer can use different molds to produce different barb shapes of the welding part 22 according to the needs, as shown in Figures 7 to 12, respectively A circular, W-shaped, rectangular, triangular, horizontal linear and trapezoidal welding part 22, so the barb shape of the welding part 22 can be used to replace the solder ball, so that the welding part 22 of the conductive terminal 3 can directly use the surface Adhesive process is soldered to the corresponding pad on the circuit board to form an electrical connection.

To sum up, the electrical connector of the present invention uses a plurality of conductive terminals with barb-shaped welding parts, and the bottom surface of the welding parts can directly replace the solder balls for surface-adhesive welding, which can indeed achieve the purpose of the present invention. Purpose.

The above description is only a preferred embodiment of the present invention. Although the zero-insertion force electrical connector is used as an illustration, it can also be applied to other electrical connectors that are soldered on the circuit board by surface-mounting. Therefore, it cannot be used This limits the implementation scope of the utility model, that is, all equivalent changes and replacements made according to the content disclosed in the utility model shall be regarded as the protection scope of the utility model.

Claims (10)

1. An electrical connector of a surface-mounted conductive terminal, characterized in that it comprises: An insulating casing, the insulating casing has a first surface for bonding electronic components and a second surface close to the circuit board, a plurality of terminal passages are provided on the insulating casing, and each terminal passage is respectively on the first surface and the second surface. A first opening and a second opening are formed on the two surfaces, and a locking part located in the terminal channel is further provided on the inner wall surface of the terminal channel. The locking part is in the terminal channel and forms a channel with a cross-sectional area smaller than the first the constriction of the first opening and the second opening; A plurality of conductive terminals, each conductive terminal has a joint portion, a welding portion and a positioning portion located between the joint portion and the welding portion, the welding portion forms a barb shape, and each conductive terminal can be formed by the first opening and the second opening. Either one is inserted into the corresponding terminal channel, the conductive terminal partially passes through the constricted part, wherein the positioning part and the locking part interfere with each other and are stuck, forcing the conductive terminal to be positioned in the terminal channel, and the joint part is located close to the first opening to The pins of the electronic components are in contact, the welding parts protrude from the second surface of the insulating housing, and all the welding parts forming the barb shape are on the same plane. 2. The electrical connector according to claim 1, wherein the welding portion of the conductive terminal is in the shape of a semi-circular barb. 3. The electrical connector according to claim 1, wherein the welding portion of the conductive terminal is in the shape of an annular barb. 4. The electrical connector according to claim 1, wherein the welding portion of the conductive terminal is in the shape of a W-shaped barb. 5. The electrical connector according to claim 1, wherein the welding portion of the conductive terminal is in the shape of a rectangular barb. 6. The electrical connector according to claim 1, wherein the welding portion of the conductive terminal is in the shape of a triangular barb. 7. The electrical connector according to claim 1, wherein the welding portion of the conductive terminal is in the shape of a horizontal barb. 8. The electrical connector according to claim 1, wherein the welding portion of the conductive terminal is in the shape of a trapezoidal barb. 9. The electrical connector according to claim 1, wherein the locking part of the insulating housing is a rib protruding from the inner wall of the corresponding terminal channel, and the positioning part of the conductive terminal is A concave shape is formed on the conductive terminal. 10. The electrical connector according to claim 1, wherein the insulating housing is further provided with a plurality of stoppers, the stoppers correspond to the inner wall of the terminal channel, and the conductive terminals A protruding wing is formed on the top, and when the conductive terminal is inserted into the terminal channel, the stopper blocks the wing to limit the relative position of the conductive terminal and the terminal channel.

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