Electric connector contact terminal material belt structure

Abstract

The utility model relates to the field of electric connectors, and provides an electric connector contact terminal material belt structure. A row of contact terminals distributed at equal intervals are punched on the lower middle portion of the material belt in the length direction, the contact terminals are continuous bent pieces, each contact terminal comprises a head, a contact portion, an elastic portion, a holding portion and a welding foot from top to bottom, the contact portions are bent towards one side of the plane of the material belt in an arc mode, and the welding feet are bent towards the other side of the plane of the material belt in a right-angle mode. Notches are formed in the material belt at equal intervals, the notches correspond to the holding parts of the contact terminals on the two sides of the material belt, protection feet which are bent towards one side of the plane of the material belt in a right-angle mode are punched at the notches, the bending direction of the protection feet is the same as that of the welding feet, and the end portions of the protection feet are higher than the height of the welding feet. The notches formed in the material belt at intervals are punched to form the protection feet which are the same as the welding bending direction and higher than the welding direction, welding deformation can be effectively avoided in the packaging process, and the size requirement during terminal assembling is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of electrical connectors, and particularly to a strip structure of contact terminals of an electrical connector. Background Art

[0002] An electrical connector generally consists of a plastic body and two rows of contact terminals installed in the plastic body. The two rows of terminals include several signal terminals, power terminals, ground terminals, etc. The contact ends of the terminals and the welding feet of the terminals are in a bent state. There is a gap between the contact segments of the two rows of contact terminals for inserting memory chips, graphics cards and other chips, and the contact segments of the terminals are correspondingly conducted with the contact pads of the chips.

[0003] During the assembly process of the electrical connector, the contact terminals are packaged in a roll form. The contact terminals are made of a rolled copper material strip, which is successively stamped, electroplated and packaged and then sent to the assembly line. On the assembly line, after the terminal strip is cut, it is inserted into the plastic body by an automatic machine, and after processes such as pressurization, side trimming, and conduction testing, the assembly is completed. Since the terminals are wound and packaged, although paper tapes are placed between each coil of terminals for separation, during transportation, the terminal strip will inevitably be squeezed, resulting in deformation of the terminals. And during the assembly process, the coplanarity of the terminals on the strip needs to meet the specification of 0.03 mm. Therefore, it is necessary to ensure that the winding after stamping and the winding after electroplating of the contact terminals can meet the dimensional requirements of coplanarity.

[0004] During the stamping process, in order to save the consumption of the copper material strip, it is necessary to arrange two strips in an interdigitated layout. One copper material strip is stamped to form two mirror-symmetrical contact terminal strips. That is, the vacant part between adjacent contact terminals on one terminal strip is stamped into the contact part of the terminals on the other strip. Such a compact layout can greatly reduce the waste of copper materials. In order to play a protective role during the packaging process, in the prior art, it is usually necessary to stamp a protection foot structure on the material channel for support during the packaging process. However, stamping the protection feet separately requires sufficient space to be left on the strip, that is, the width of the strip needs to be increased, and a row of space for packaging protection feet is left separately, which will cause an increase in the consumption of copper materials. Summary of the Invention

[0005] In order to avoid dimensional problems caused by deformation of the contact terminals of the electrical connector during the packaging processes of stamping and electroplating, the utility model provides a strip structure of contact terminals of an electrical connector.

[0006] The technical solution adopted by the utility model is as follows:

[0007] An electrical connector contact terminal strip structure includes a pair of mirror-symmetrical strips. One side edge of each strip is punched with notches at equal intervals along the length direction. The strip is punched with a row of equally spaced positioning holes along the length direction. A row of equally spaced contact terminals is stamped along the length direction in the middle and lower part of the strip. The contact terminal is a continuous bent part, and the contact terminal includes a head, a contact part, an elastic part, a holding part, and a welding leg from top to bottom. The welding leg is close to the side where the positioning hole is located. The head and the holding part are in the same plane. The contact part is bent in an arc towards one side of the strip plane. The contact part smoothly transitions from the elastic part to the holding part. The welding leg is bent at a right angle towards the other side of the strip plane, and the bending part of the welding leg is transitioned by an arc. The head of the holding part is trapezoidal. Barbed structures are provided on both sides of the middle part of the holding part. The root of the holding part is integrated with the strip. Notches are provided at equal intervals on the strip. The notches on the strip correspond to the holding parts of the contact terminals on both sides. A protection leg bent at a right angle towards one side of the strip plane is stamped at the notch. The bending direction of the protection leg is the same as that of the welding leg. The end of the protection leg is higher than the height of the welding leg.

[0008] Further, the contact terminal is trapezoidal from the head to the holding part, that is, the width of the contact terminal gradually increases from the head to the holding part.

[0009] Further, V-shaped cutting grooves are respectively stamped on the front and back sides of the root of the holding part. The width of the V-shaped cutting groove corresponds to the width of the holding part. The depth of each V-shaped cutting groove is one-fifth of the thickness of the strip.

[0010] Further, the front surface of the contact part is arc-shaped, that is, the contact surface of the contact part is an arc surface.

[0011] Further, the spacing between adjacent positioning holes is twice the spacing between adjacent contact terminals.

[0012] Further, both sides of the holding part include two guiding slopes and a barb part distributed from the head to the root. The two guiding slopes are transitioned through a horizontal part. The slope of the first guiding slope is less than that of the second guiding slope.

[0013] Still further, the positions of the positioning holes on a pair of the mirror-symmetrical strips correspond, and the contact terminals on the two strips are distributed at intervals.

[0014] After adopting the above technical solutions, the beneficial effects of the present utility model are as follows: By stamping a copper strip to form two mirror-image strip materials, and using the partial cross-overlap of the two strip materials, the reduction of the width of the strip material can be achieved, effectively saving the usage of copper materials; at the notches that appear at intervals on the strip material, protective feet that are in the same direction as the welding bending direction and higher than the welding are stamped, which can effectively avoid the deformation of the welding during the packaging process, ensure the dimensional requirements during the assembly of the terminals, and at the same time, using the notches to stamp the protective feet can avoid increasing the width of the copper material to add additional width for stamping the protective feet, achieving the effect of saving copper materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a terminal strip material.

[0016] Figure 2 It is a partial schematic diagram of a terminal strip material

[0017] Figure 3 It is a schematic diagram of the structure of a contact terminal.

[0018] Figure 4 It is a partial enlarged view A. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following further details the specific implementation manners of the present utility model in conjunction with the accompanying drawings:

[0020] As Figure 1 shown, a structure of a strip material for an electrical connector contact terminal includes a pair of mirror-symmetrical strip materials 1, and the pair of mirror-symmetrical strip materials are formed by stamping a copper strip material with a mold.

[0021] As Figure 2 shown, on one side edge of each strip material along the length direction, notches 2 are punched at equal intervals. The notches 2 are used for the positioning of the subsequent assembly section and to avoid stress concentration at the edge of the strip material during winding. Along the length direction of the strip material, a row of equally spaced positioning holes 3 are punched. The positioning holes 3 are close to the notches. The positioning holes 3 are used for positioning in the stamping mold and for feeding the strip material. Along the length direction in the middle and lower part of the strip material 1, a row of equally spaced distributed contact terminals 4 are stamped.

[0022] As Figures 3 - 4As shown, the contact terminal 4 is a bent part formed by continuous stamping. The contact terminal 4 includes a head 41, a contact part 42, an elastic part 43, a holding part 44, and a welding leg 45 from top to bottom. The contact terminal 4 is trapezoidal from the head to the holding part, that is, the width of the contact terminal gradually increases from the head to the holding part. The welding leg 45 of the terminal is close to the positioning hole 3, and the heads 41 of the terminals on a pair of mirror-symmetrical tapes are distributed relatively. The spacing between adjacent positioning holes 3 is twice the spacing between adjacent contact terminals 4. In order to save the consumption of copper material, the head of the terminal on one of the material channels is inserted between the elastic parts of two adjacent terminals on the other material channel. The two tapes form an intersection, making full use of the material in the gap between adjacent contact terminals.

[0023] The head 41 and the holding part 44 of the contact terminal 4 are in the same plane as the tape. The contact part 42 is bent in an arc shape towards one side of the tape plane to form a protruding part. The front surface of the protruding part is formed into an arc shape after stamping, that is, the contact surface of the contact part is an arc surface that transitions in an arc from the middle to both sides in the width direction. During use, the contact surface uses the arc surface to contact the contact point of the chip, and a better conduction effect can be obtained.

[0024] The contact part 42 smoothly transitions from the elastic part 43 to the holding part 44. The root of the elastic part 43 is connected to the holding part 44, that is, the elastic part 43 is bent from the holding part 44. When extrusion occurs between the contact part 42 and the chip, the elastic part 43 deforms and provides the contact pressure between the contact part 42 and the chip through springback.

[0025] The holding part 44 is used for fixing with the plastic body of the connector, and is used for the installation of the contact terminal 4 and at the same time provides support for the elastic deformation of the elastic part. The two sides in the width direction of the holding part 44 include two guiding slopes 441 distributed from the head to the root and a barb part 442. The two guiding slopes 441 are transitioned through a horizontal part. The slope of the first guiding slope is less than that of the second guiding slope. The two guiding slopes facilitate the holding part 44 to be inserted into the corresponding installation hole groove of the plastic body, and then a fixed connection is formed with the barb part 442. The root of the holding part 44 is integrated with the tape. V-shaped cut grooves 443 are respectively stamped on the front and back sides of the root of the holding part 44. The width of the V-shaped cut grooves 443 corresponds to the width of the holding part 44. The depth of each V-shaped cut groove 443 is one-fifth of the thickness of the tape, which is convenient for separating the terminal from the tape by bending back and forth after inserting the contact terminal into the plastic body.

[0026] The welding leg 45 is connected to the holding part. The welding leg 45 is bent at a right angle towards the other side of the tape plane, and the bending part of the welding leg 45 is transitioned by an arc; the welding leg 45 is used for welding with the printed circuit board. The two rows of welding legs form a plane, and the flatness of the welding legs needs to meet the requirement of 0.03 mm to ensure that all welding legs can effectively contact and weld with the printed circuit board.

[0027] Since the tape is provided with equally spaced notches 5, it is convenient to cut the tape into multiple small tapes corresponding to the length of the electrical connector during assembly. In order to prevent the welding from deforming during the packaging process, using the material at the notch 5, a protection leg 6 that is bent at a right angle towards the side where the welding is bent is punched at the notch. The bending direction of the protection leg 6 is the same as that of the welding leg 45, and the end of the protection leg 6 is higher than the height of the welding leg 45. During the packaging process, the protection leg 6 is used to support the paper tape for packaging, preventing the welding leg 45 from contacting the paper tape and thus avoiding deformation.

Claims

1. An electrical connector contact terminal strip structure, comprising a pair of mirror-symmetrical strips, characterized in that: Each of the material strips is punched with notches at equal intervals on one side edge along the length direction, and the material strip is punched with a row of positioning holes set at equal intervals along the length direction. A row of contact terminals distributed at equal intervals are punched on the middle and lower part of the material strip along the length direction. The contact terminal is a continuous bending part, and the contact terminal includes a head, a contact part, an elastic part, a holding part and a welding foot from top to bottom. The welding foot is close to the side where the positioning hole is located, the head and the holding part are in the same plane, the contact part is bent in an arc toward one side of the material strip plane, and the contact part is bent from the elastic part to the holding part. The holding part has a smooth transition, the solder leg is bent at a right angle to the other side of the material strip plane, and the bending part of the solder leg is transitioned by an arc; the head of the holding part is trapezoidal, and barb structures are provided on both sides of the middle part of the holding part, and the root of the holding part is integrated with the material strip; notches are provided on the material strip at equal intervals, and the notches are located on the material strip corresponding to the holding parts of the contact terminals on both sides, and a protective foot is stamped at the notch and bent at a right angle to one side of the material strip plane, the bending direction of the protective foot is the same as that of the solder leg, and the end of the protective foot is higher than the height of the solder leg.

2. The electrical connector contact terminal strip structure according to claim 1, characterized in that: The contact terminal is in a trapezoidal shape from the head to the holding portion, that is, the width of the contact terminal gradually increases from the head to the holding portion.

3. The electrical connector contact terminal strip structure according to claim 1, characterized in that: V-shaped grooves are punched on the front and rear sides of the root of the holding portion, respectively. The width of the V-shaped groove corresponds to the width of the holding portion, and the depth of each V-shaped groove is one fifth of the thickness of the material strip.

4. The electrical connector contact terminal strip structure according to claim 1, characterized in that: The front side of the contact portion is in an arc shape, that is, the contact surface of the contact portion is an arc surface.

5. The electrical connector contact terminal strip structure according to claim 1, characterized in that: The spacing between adjacent positioning holes is twice the spacing between adjacent contact terminals.

6. The electrical connector contact terminal strip structure according to claim 1, characterized in that: The two sides of the holding portion include two guide slopes distributed from the head to the root and a barb portion, the two guide slopes are transitioned through a horizontal portion, and the slope of the first guide slope is smaller than that of the second guide slope.

7. The electrical connector contact terminal strip structure according to claim 1, characterized in that: The locating holes on a pair of mirror-symmetrical material strips are located in corresponding positions, and the contact terminals on the two material strips are distributed at intervals.

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