JP2016035824A - Welding method of lead frame and connector terminal and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding method of a lead frame and a connector terminal capable of preventing poor weld of the connector terminal and lead frame effectively, by preventing positional deviation of a welding electrode from the connector terminal.SOLUTION: After removing two parts facing each other, out of a metal plating (nickel plating (1b), tin (1c)) on the surface of a connector terminal (1), respectively, and forming parallel exposed surfaces (4a, 4b) exposing the base material (1a) of the connector terminal (1), one (4a) of the exposed surfaces of the connector terminal (1) is brought into contact with the surface of a lead frame (2), and the other (4b) of the exposed surfaces is brought into contact with a welding electrode, before welding the connector terminal (1) to the lead frame (2).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for welding a lead frame and a connector terminal and an electronic apparatus, and more particularly, to a method for welding a lead frame and a connector terminal and an electronic apparatus for welding a connector terminal having a metal plating on its surface to the lead frame.

  Conventionally, as shown in FIG. 10, the lead frame 92 and the connector terminal 91 are sandwiched between the lead frame 92 and the connector terminal 91 by the welding electrodes 95 and 96 made of a metal plate, and a voltage is applied. There is a method using spot welding (resistance welding) in which the welded portion is melted by Joule heat generation and the materials to be welded are coupled metallurgically (Japanese Patent Laid-Open No. 2008-218189 (Patent Document 1)).

  When welding the connector terminal 91 to the lead frame 92 using such spot welding, when the welding electrode 96 is pressed against the connector terminal 91, the surface of the connector terminal 91 is not flat (cylindrical side surface). The welding electrode 96 is slippery with respect to the connector terminal 91. At this time, the welding electrode 96 is displaced with respect to the connector terminal 91, so that welding failure occurs such that the connector terminal 91 and the lead frame 92 cannot be welded or the welding strength is weak even if the welding is performed. There was a problem.

JP 2008-218189 A

  Accordingly, an object of the present invention is to provide a method for welding a lead frame and a connector terminal and an electronic device that can prevent the displacement of the welding electrode with respect to the connector terminal and can effectively prevent poor welding between the connector terminal and the lead frame. It is to provide.

In order to solve the above problems, the welding method of the lead frame and the connector terminal of the present invention includes:
A welding method of a lead frame and a connector terminal for welding a connector terminal having a metal plating on its surface to the lead frame,
A metal plating removing step of removing two opposing portions of the metal plating applied to the surface of the connector terminal to form exposed surfaces parallel to each other where the base material of the connector terminal is exposed;
A welding step in which one of the exposed surfaces of the connector terminal is brought into contact with the surface of the lead frame, and the other of the exposed surfaces is brought into contact with a welding electrode to weld the connector terminal to the lead frame. It is characterized by.

Moreover, in the method for welding the lead frame and the connector terminal of one embodiment,
Before the welding step, a slit forming step of forming a slit along the longitudinal direction of the connector terminal in the connector terminal contact region on the surface of the lead frame with which the exposed surface of the connector terminal contacts.

Moreover, in the method for welding the lead frame and the connector terminal of one embodiment,
The slit is formed in a groove shape.

Moreover, in the method for welding the lead frame and the connector terminal of one embodiment,
A plurality of the slits are formed in the connector terminal contact area.

Moreover, in the method for welding the lead frame and the connector terminal of one embodiment,
The width of the slit in the direction perpendicular to the longitudinal direction is smaller than the width in the direction perpendicular to the longitudinal direction of the base material on the exposed surface in contact with the surface of the lead frame.

Moreover, in the method for welding the lead frame and the connector terminal of one embodiment,
The areas of the exposed surfaces of the connector terminals are equal.

In the electronic device of the present invention,
An electronic device in which a connector terminal having a metal plating on its surface is welded to a lead frame,
On the surface of the connector terminal, two parallel exposed surfaces facing each other are formed in which the metal plating is removed and the base material of the connector terminal is exposed,
In the connector terminal contact area of the surface of the lead frame that the exposed surface of the connector terminal contacts, a slit is formed along the longitudinal direction of the connector terminal,
One of the exposed surfaces of the connector terminal is welded to the connector terminal contact area of the lead frame.

  As is clear from the above, according to the lead frame and connector terminal welding method and electronic apparatus of the present invention, the surface of the lead frame is brought into contact with one exposed surface of the connector terminal and the other exposed surface of the connector terminal is contacted. Since the welding electrode is brought into contact and the connector terminal and the lead frame are welded, displacement of the welding electrode with respect to the connector terminal can be prevented, and poor welding between the connector terminal and the lead frame can be effectively prevented. .

FIG. 1 is a view for explaining a method of welding a lead frame and a connector terminal according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state where the plating on the surface of the connector terminal is removed. FIG. 3 is a plan view for explaining the surface of the lead frame with which the exposed surface of the connector terminal contacts. FIG. 4 is a cross-sectional view showing an electronic device created by welding the connector terminal and the lead frame. FIG. 5 is a view for explaining a method of welding the lead frame and the connector terminal according to the second embodiment of the present invention. FIG. 6 is a plan view for explaining the surface of the lead frame with which the exposed surface of the connector terminal contacts. FIG. 7 is a cross-sectional view showing an electronic device created by welding the connector terminal and the lead frame. FIG. 8 is a view for explaining a method of welding the lead frame and connector terminal according to the third embodiment of the present invention. FIG. 9 is a view for explaining a method of welding the lead frame and connector terminal according to the fourth embodiment of the present invention. FIG. 10 is a diagram for explaining a conventional method for welding a lead frame and a connector terminal.

  Hereinafter, a method for welding a lead frame and a connector terminal according to the present invention will be described in detail with reference to embodiments shown in the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a method for welding a lead frame and a connector terminal according to the first embodiment of the present invention. In this embodiment, the material of the lead frame 2 to which the connector terminal 1 is welded is 42 alloy (Fe—Ni alloy containing 42 wt% nickel). The lead frame 2 is a plate-like member.

  FIG. 2 shows a state where the plating is removed by cutting or polishing the surface of the connector terminal 1.

  As shown in FIG. 2, the connector terminal 1 includes a base material 1a having a circular cross section made of brass, a nickel plating 1b provided on the surface of the base material 1a, and a tin provided on the surface of the nickel plating 1b. And plating 1c.

  In the lead frame and connector terminal welding method of this embodiment, first, in the metal plating removal step, the two opposite metal platings (nickel plating 1b and tin plating 1c) of the surface portion of the connector terminal 1 are removed. Thus, exposed surfaces 4a and 4b that are parallel to each other and from which the substrate 1a is exposed are formed. The areas of the exposed surfaces 4a and 4b are substantially equal. That is, the areas of the exposed surfaces 4a and 4b differ by the tolerance of the processing accuracy of the exposed surfaces 4a and 4b.

  Next, in the welding process, the exposed surface 4 a of the connector terminal 1 is brought into contact with the surface of the lead frame 2, and the exposed surface 4 b is brought into contact with the welding electrode to spot weld the connector terminal 1 to the lead frame 2.

  In the metal plating removal step, the depth D of the exposed surfaces 4a and 4b of the connector terminal 1 (the distance in the radial direction from the outer periphery toward the center O of the base 1a) is used in order to reliably remove the metal plating of the connector terminal 1. In order to reliably remove the nickel plating 1b, the thickness is set to be twice or more of the entire plating thickness d.

  In addition, if the surface of the exposed surface 4a of the connector terminal 1 formed by cutting or polishing is smooth, there are fewer welding defects.

  As a result of an experiment in which the inventor manually cut the paper using a paper file, it was found that the smoother surface of the exposed surface 4a of the connector terminal 1 has fewer welding defects than the rough surface. For this reason, the surface roughness of the exposed surface 4a is set to a finished state using # 1000 or more of JIS standard R6001 based on the file standard.

  FIG. 3 shows the surface of the lead frame 2 with which the exposed surface of the connector terminal 1 comes into contact.

  As shown in FIG. 3, the lead frame 2 is a flat plate having a rectangular shape in plan view. A connector terminal contact region 2 a extends from one end to the center of the lead frame 2 along the longitudinal direction of the lead frame 2 at the center in the short direction of the lead frame 2. The connector terminal contact area 2 a is an area where the exposed surface 4 a of the connector terminal 1 is in contact with the surface of the lead frame 2.

  FIG. 4 shows a cross section of an electronic device created by welding the connector terminal 1 and the lead frame 2.

  As shown in FIG. 4, a fusion part 3 that is melted into both the connector terminal 1 and the lead frame 2 is formed between the connector terminal 1 and the lead frame 2, and a normal welding state is obtained.

  According to the welding method of the lead frame and the connector terminal having the above configuration, the two opposing portions of the metal plating 1b, 1c applied to the surface of the connector terminal 1 are removed to expose the base material 1a of the connector terminal 1. After forming the exposed surfaces 4a and 4b parallel to each other, the exposed surface 4a of the connector terminal 1 is brought into contact with the surface of the lead frame 2, and the exposed surface 4b is brought into contact with the welding electrode so that the connector terminal 1 and the lead frame are brought into contact with each other. 2 is welded. At this time, the welding electrode is less likely to slip with respect to the exposed surface 4 a of the connector terminal 1 due to surface contact between the flat surfaces. Therefore, displacement of the welding electrode with respect to the connector terminal 1 can be prevented, and poor welding between the connector terminal 1 and the lead frame 2 can be effectively prevented.

(Second Embodiment)
FIG. 5 is a diagram illustrating a method for welding a lead frame and a connector terminal according to the second embodiment of the present invention. FIG. 6 is a view for explaining the surface of the lead frame with which the exposed surface of the connector terminal contacts.

  The second embodiment is different from the first embodiment only in that a slit is formed in the lead frame before the welding process. This different configuration will be described below.

  In the second embodiment, the same reference numerals as those in the first embodiment indicate the same configurations as those in the first embodiment, and the description thereof is omitted.

  As shown in FIG. 5 and FIG. 6, in the lead frame and connector terminal welding method of this embodiment, the connector terminal contact on the surface of the lead frame 12 with which the exposed surface 4 a of the connector terminal 1 contacts before the welding step. A slit 5 is formed in the region 12 a so as to penetrate the lead frame 12 along the longitudinal direction of the connector terminal 1.

  The slit 5 is located at the center of the surface of the lead frame 12 and has a substantially rectangular shape. The width W1 in the short direction of the slit 5 is smaller than the width W2 in the short direction of the substrate 1a on the exposed surface 4a contacting the surface of the lead frame 12.

  FIG. 7 shows a cross section of an electronic device created by welding the connector terminal and the lead frame.

  As shown in FIG. 7, a fusion part 13 is formed between the connector terminal 1 and the lead frame 12 so as to melt into both the connector terminal 1 and the lead frame 2, and a part of the fusion part 13 is It is also located in at least part of the slit 5.

  According to the second embodiment, since the slits 5 are formed in the connector terminal contact area 12a of the lead frame 12, the area of the connector terminal contact area 12a is reduced. For this reason, the contact resistance between the connector terminal 1 and the lead frame 12 in the connector terminal contact region 12a increases. Thereby, in the said welding process, compared with the case where the slit 5 is not formed in the connector terminal contact area 12a, the Joule heat which generate | occur | produces in the connector terminal contact area 12a can be enlarged, and the connector terminal 1 and the lead frame 12 are made. It can be melted sufficiently. Therefore, the fusion part 13 melted into both the connector terminal 1 and the lead frame 12 can be more reliably formed, and the welding strength between the connector terminal 1 and the lead frame 12 can be improved.

  In the welding process, a part of the fusion part 13 including the base material 1a melted in at least part of the slit 5 of the lead frame 12 enters, and a part of the fusion part 13 becomes an anchor. Therefore, the fusion part 13 is more firmly fixed to the lead frame 12, and the welding strength between the connector terminal 1 and the lead frame 12 can be further improved.

  Moreover, since the width W1 in the short direction of the slit 5 is smaller than the width W2 in the short direction of the base material 1a on the exposed surface 4a, only the base material 1a in which the connector terminal 1 is melted in the welding step. It can enter into the slit 5. Therefore, the fusion part 13 can be more firmly fixed to the lead frame 12, and the welding strength between the connector terminal 1 and the lead frame 12 can be further improved.

(Third embodiment)
FIG. 8 is a diagram for explaining a method of welding the lead frame and the connector terminal according to the third embodiment of the present invention.

  The third embodiment is different from the second embodiment only in that a groove having a U-shaped cross section is formed as the slit. This different configuration will be described below.

  In the third embodiment, the same reference numerals as those in the second embodiment indicate the same configurations as those in the second embodiment, and the description thereof is omitted.

  As shown in FIG. 8, in the lead frame and connector terminal welding method of this embodiment, a groove having a U-shaped cross section is formed as a slit 25 in the lead frame 22. The slit 25 may be provided with a through hole (not shown). A part of the fusion part is located in at least a part of the slit 25.

  According to the third embodiment, since the slit 25 is formed in the lead frame 22 in a groove shape, the slit 25 is formed in comparison with the case where the slit is formed so as to penetrate the lead frame 22. It can be formed at a low cost and in a short time.

(Fourth embodiment)
FIG. 9 is a view for explaining a method of welding the lead frame and the connector terminal according to the fourth embodiment of the present invention.

  The fourth embodiment is different from the first embodiment only in that two slits are formed. This different configuration will be described below.

  In the fourth embodiment, the same reference numerals as those in the first embodiment indicate the same configurations as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIG. 9, in the lead frame and connector terminal welding method of this embodiment, two slits 35, 35 are formed in the lead frame 32.

  These slits 35 and 35 are formed in parallel in the direction orthogonal to the longitudinal direction of the connector terminal 1, that is, in parallel with each other along the longitudinal direction.

  According to the fourth embodiment, since the two slits 35 are formed, in the welding process, a part of the fusion portion including the base material 1a in which the connector terminal 1 is melted is formed of the two slits 35 and 35. At least partly enters and becomes anchors at two places. Therefore, the fusion part can be more firmly fixed to the lead frame 32, and the welding strength between the connector terminal 1 and the lead frame 32 can be further improved.

  Next, fifth to eighth embodiments as modifications of the first to fourth embodiments will be described.

(Fifth embodiment)
In the first to fourth embodiments, the areas of the exposed surfaces 4a and 4b of the connector terminal 1 are different, but may be equal. By making the respective areas of the exposed surfaces 4a and 4b equal, each resistance value becomes the same, the amount of heat generated by the resistance becomes the same, and the melting volume becomes the same, so that stable welding is achieved. realizable.

(Sixth embodiment)
Moreover, in the said 2nd Embodiment, although the width W1 of the said transversal direction of the slit 5 was smaller than the width W2 of the said transversal direction of the base material 1a in the exposed surface 4a, it is not restricted to this, A base material It may be larger than or equal to the width in the short direction of 1a.

(Seventh embodiment)
In the third embodiment, the lead frame 22 is formed with a U-shaped groove as the slit 25. However, the shape of the slit groove is not limited to this, and the U-shaped cross section and V-shaped cross section are used. Other shapes may be used.

(Eighth embodiment)
In the fourth embodiment, the two slits 35 and 35 are formed in parallel with each other along the longitudinal direction of the connector terminal 1, but are not limited thereto. Three or more slits may be formed parallel to and spaced from each other along the longitudinal direction. Two or more slits may be formed intermittently along the longitudinal direction.

  Of course, the components described in the first to eighth embodiments may be combined as appropriate, and may be appropriately selected, replaced, or deleted.

  The present invention and the embodiments are summarized as follows.

The lead frame and connector terminal welding method of the present invention are:
A welding method of a lead frame and a connector terminal, wherein a connector terminal 1 having a metal plating 1b, 1c on its surface is welded to the lead frames 2, 12, 22, 32,
Two opposing portions of the metal plating 1b, 1c applied to the surface of the connector terminal 1 are removed to form exposed surfaces 4a, 4b parallel to each other where the base material 1a of the connector terminal 1 is exposed. A metal plating removal process,
One of the exposed surfaces 4a and 4b of the connector terminal 1 is brought into contact with the surface of the lead frames 2, 12, 22, and 32, and the other of the exposed surfaces 4a and 4b is brought into contact with a welding electrode, whereby the connector A welding process for welding the terminal 1 to the lead frames 2, 12, 22, 32.

  According to the above configuration, the exposed surfaces 4a parallel to each other where the two opposing portions of the metal plating 1b, 1c applied to the surface of the connector terminal 1 are removed to expose the base material 1a of the connector terminal 1 are exposed. , 4b, one of the exposed surfaces 4a, 4b of the connector terminal 1 is brought into contact with the surface of the lead frame 2, 12, 22, 32, and the other exposed surface 4a, 4b is brought into contact with the welding electrode. The connector terminal 1 is welded to the lead frames 2, 12, 22 and 32. At this time, the welding electrode is less likely to slip with respect to the exposed surface 4 a of the connector terminal 1 due to surface contact between the flat surfaces. Therefore, the position shift of the welding electrode with respect to the connector terminal 1 can be prevented, and poor welding between the connector terminal 1 and the lead frames 2, 12, 22, 32 can be effectively prevented.

Moreover, in the method for welding the lead frame and the connector terminal of one embodiment,
Before the welding process, a slit is formed along the longitudinal direction of the connector terminal 1 in the connector terminal contact region 2a on the surface of the lead frame 2, 12, 22 with which the exposed surfaces 4a, 4b of the connector terminal 1 are in contact. A slit forming step for forming 5, 25 and 35;

  According to the above embodiment, the slits 5, 25, 35 are formed in the connector terminal contact area 2a of the lead frames 2, 12, 22, 32, so that the area of the connector terminal contact area 2a is reduced. For this reason, the contact resistance between the connector terminal 1 and the lead frames 2, 12, 22, 32 in the connector terminal contact region 2a is increased. Thereby, in the said welding process, the Joule heat which generate | occur | produces in the connector terminal contact area | region 2a can be enlarged compared with the case where the slit 5,25,35 is not formed in the connector terminal contact area | region 2a, and the connector terminal 1 and The lead frames 2, 12, 22, 32 can be sufficiently melted. Therefore, it is possible to more reliably form the fusion portions 3 and 13 that are melted into both the connector terminal 1 and the lead frames 2, 12, 22, and 32, and improve the welding strength between the connector terminal 1 and the lead frames 2, 12, and 22. it can.

  In the welding process, part of the fusion parts 3 and 13 including the base material 1a melted in at least part of the slits 5, 25, and 35 of the lead frames 2, 12, 22, and 32 enters, and the fusion part A part of 3 and 13 becomes an anchor. Therefore, the fusion part 3 is more firmly fixed to the lead frames 2, 12, 22, 32, and the welding strength between the connector terminal 1 and the lead frames 2, 12, 22, 32 can be further improved.

Moreover, in the method for welding the lead frame and the connector terminal of one embodiment,
The slits 5, 25 and 35 are formed in a groove shape.

  According to the above embodiment, since the slits 5, 25, 35 are formed in a groove shape, for example, the slits 5, 25, 35 are formed so as to penetrate the lead frames 2, 12, 22, 32. Compared to the case, the slits 5, 25, and 35 can be formed at a low cost and in a short time.

Moreover, in the method for welding the lead frame and the connector terminal of one embodiment,
A plurality of the slits 5, 25, 35 are formed in the connector terminal contact area 2a.

  According to the above embodiment, since a plurality of the slits 5, 25, 35 are formed in the connector terminal contact region 2a, at least the fusion parts 3, 13 including the base material 1a in which the connector terminal 1 is melted in the welding process. A part enters the slits 5, 25 and 35, respectively, and becomes anchors at a plurality of locations. Therefore, the fusion portions 3 and 13 can be more firmly fixed to the lead frames 2, 12, 22 and 32, and the welding strength between the connector terminal 1 and the lead frames 2, 12, 22 and 32 can be further improved. .

Moreover, in the method for welding the lead frame and the connector terminal of one embodiment,
The width W1 of the slits 5, 25, 35 in the direction perpendicular to the longitudinal direction is such that the longitudinal direction of the substrate 1a on the exposed surfaces 4a, 4b contacting the surfaces of the lead frames 2, 12, 22, 32. Is smaller than the width W2 in the direction orthogonal to.

  According to the embodiment, since the width W1 of the slits 5, 25, and 35 is smaller than the width W2 of the base material 1a in the exposed surfaces 4a and 4b, the melted base of the connector terminal 1 in the welding process. Only the material 1a can enter the slits 5, 25, 35. Therefore, the fusion part 13 can be more firmly fixed to the lead frames 2, 12, 22, 32, and the welding strength between the connector terminal 1 and the lead frames 2, 12, 22, 32 can be further improved.

Moreover, in the method for welding the lead frame and the connector terminal of one embodiment,
The areas of the exposed surfaces 4a and 4b of the connector terminal 1 are equal.

  According to the above-described embodiment, since the areas of the exposed surfaces 4a and 4b are equal, the resistance values of the exposed surfaces 4a and 4b are the same, and the amount of heat generated by the resistance is the same and melts. Stable welding can be realized by having the same volume.

In the electronic device of the present invention,
An electronic device in which a connector terminal 1 with metal plating 1b, 1c on the surface is welded to the lead frames 2, 12, 22;
On the surface of the connector terminal 1, there are formed two parallel exposed surfaces 4a and 4b opposite to each other where the metal plating 1b and 1c are removed and the base material 1a of the connector terminal 1 is exposed,
In the connector terminal contact area 2a on the surface of the lead frame 2, 12, 22 with which the exposed surfaces 4a, 4b of the connector terminal 1 are in contact, slits 5, 25, 35 are provided along the longitudinal direction of the connector terminal 1. Formed,
One of the exposed surfaces 4a and 4b of the connector terminal 1 is welded to the connector terminal contact area 2a of the lead frames 2, 12, and 22.

  According to the above configuration, since the slits 5, 25, and 35 are formed in the connector terminal contact region 2a of the lead frames 2, 12, 22, and 32, the area of the connector terminal contact region 2a is reduced. For this reason, the contact resistance between the connector terminal 1 and the lead frames 2, 12, 22, 32 in the connector terminal contact region 2a is increased. As a result, the Joule heat generated in the connector terminal contact area 2a can be increased as compared with the case where the slits 5, 25, 35 are not formed in the connector terminal contact area 2a. , 12, 22 and 32 can be sufficiently melted. Therefore, the fusion portions 3 and 13 that are melted into both the connector terminal 1 and the lead frames 2, 12, 22, and 32 are reliably formed, and the welding strength between the connector terminal 1 and the lead frames 2, 12, and 22 can be improved. .

  Further, a part of the fusion parts 3 and 13 including the base material 1a melted in the slits 5, 25 and 35 of the lead frames 2, 12, 22, and 32 enter, and a part of the fusion parts 3 and 13 are anchors. Become. Therefore, the fusion parts 3 and 13 are more firmly fixed to the lead frames 2, 12, 22 and 32, and the welding strength between the connector terminal 1 and the lead frames 2, 12, 22 and 32 can be further improved.

DESCRIPTION OF SYMBOLS 1 ... Connector terminal 1a ... Base material 1b ... Nickel plating 1c ... Tin plating 2, 12, 22, 32 ... Lead frame 2a, 12a ... Connector terminal contact area 4a, 4b ... Exposed surface 5, 25, 35 ... Slit W1, W2 …width

Claims (5)

A welding method of a lead frame and a connector terminal for welding a connector terminal having a metal plating on its surface to the lead frame,
A metal plating removing step of removing two opposing portions of the metal plating applied to the surface of the connector terminal to form exposed surfaces parallel to each other where the base material of the connector terminal is exposed;
A welding step in which one of the exposed surfaces of the connector terminal is brought into contact with the surface of the lead frame, and the other of the exposed surfaces is brought into contact with a welding electrode to weld the connector terminal to the lead frame. A method for welding a lead frame and a connector terminal. In the welding method of the lead frame and connector terminal according to claim 1,
Before the welding step, a slit forming step of forming a slit along the longitudinal direction of the connector terminal in the connector terminal contact region on the surface of the lead frame with which the exposed surface of the connector terminal contacts. And welding method of lead frame and connector terminal. In the welding method of the lead frame and connector terminal according to claim 2,
A method of welding a lead frame and a connector terminal, wherein the slit is formed in a groove shape. In the welding method of the lead frame and connector terminal as described in any one of Claim 1 to 3,
A method of welding a lead frame and a connector terminal, wherein the exposed areas of the connector terminals have the same area. An electronic device in which a connector terminal having a metal plating on its surface is welded to a lead frame,
On the surface of the connector terminal, two parallel exposed surfaces facing each other are formed in which the metal plating is removed and the base material of the connector terminal is exposed,
In the connector terminal contact area of the surface of the lead frame that the exposed surface of the connector terminal contacts, a slit is formed along the longitudinal direction of the connector terminal,
One of the exposed surfaces of the connector terminal is welded to the connector terminal contact area of the lead frame.

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