JP2000251997A - Insert mold terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a terminal from floating up from a resin case after it is insert-molded. SOLUTION: This insert molding of a terminal 2 has a connection plate 6 to be connected by wire bonding to a bonding wire on an outer surface 3a of a resin case 3. The connection plate 6 is provided with a weld surface 4 for welding the bonding wire thereto, and a float-up preventing part for the connection plate 6 is formed around the weld surface. The float-up preventing means comprises a plurality of resin-filled holes 8 formed around the weld surface and resin 9 filled in the resin-filled holes 8. Each resin-filled hole 8 has the shape of an inverted truncate cone with the weld surface side up.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal insert molded product used as a connector mounted in an engine room of an automobile.

[0002]

2. Description of the Related Art Conventionally, there has been proposed an insert molded product 80 having terminals as shown in FIG. As shown in FIG. 10, the insert molded product 80 is formed by insert molding with the upper surface of the terminal 81 being flush with the outer surface 82a of the resin case 82 or being one step higher than the outer surface 82a.

However, as shown in FIG. 11, the resin pressure at the time of insert molding and the resin case 8 after insert molding are reduced.
Since the stress P acts on the terminal 81 due to the contraction of 2, the terminal 81 may be lifted from the outer surface 82a of the resin case 82. In addition, as shown in FIG. 12, the incompletely bent terminal 8 due to springback or the like during press working.
1 'may be formed. In this case, as shown in FIG. 13, the bent state of the terminal 81 'is corrected during insert molding, so that the stress Q from the resin case 82 acts on the terminal 81'. As a result, there was a problem that the terminal 81 ′ was lifted from the outer surface 82 a of the resin case 82.

[0004] Then, as shown in FIG. 11 and FIG.
1 (81 '), the bonding wire 83 shown in FIG.
And the terminal 81 (81 ') may resonate and cause poor contact. Reference numeral 84 denotes a printed circuit board. Note that wire bonding refers to the use of a terminal 81 (8
1 ') and the bonding wire 83.

[0005]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a terminal insert molded product which prevents the terminal from floating from a resin case after insert molding.

[0006]

In order to achieve the above object, the present invention relates to an insert molded product of a terminal having a connecting plate portion for connecting a bonding wire by wire bonding on an outer surface of a resin case. The portion is provided with a welding surface for welding the bonding wire,
The present invention is characterized in that an insert molded product of the terminal is formed around the welded surface with a portion for preventing the connection plate from being lifted (claim 1). The lift prevention means is an insert molded product of a terminal including a plurality of resin filling holes formed around the welding surface and a gap resin portion filled in the resin filling hole (claim 2). An insert molded product of a terminal in which the resin filling hole has an inverted truncated pyramid shape with the welding surface side as the upper surface (claim 3).

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 9 show an embodiment of a terminal insert molded product according to the present invention. As shown in FIG. 1, the insert molded product 1 includes a terminal 2, a resin case 3 having a plurality of terminals 2 therein, and a lifting prevention means formed around a welded portion 4 of the terminal 2.

As shown in FIGS. 2 and 3, the terminal 2 has a cross section L
It comprises a V-shaped main body 5, a connecting plate 6 connected to one end of the main body 5, and a buried plate 7 integrally formed at a free end of the connecting plate 6. The terminal 2 has a band shape. The main body 5 and the connection plate 6 are connected at substantially right angles. The connection plate portion 6 and the buried plate portion 7 are joined at a substantially right angle. The main body 5 and the buried plate 7 are located on the same side with respect to the connection plate 6. The connecting plate 6 is provided with a welding surface 4 for welding a bonding wire.

As shown in FIGS. 4 and 5, the lifting prevention means includes a pair of resin filling holes 8, 8 formed in the connecting plate portion 6 located before and after (or left and right) of the welding surface 4. 8 and a gap resin portion 9 filled in the inside. The pair of resin-filled holes 8, 8 sandwich the welding surface 4 and are aligned with the welding surface 4 on the connection plate 6. As shown in FIG. 5, the cross section of the resin filling hole 8 has a substantially inverted truncated cone shape. That is, the upper opening surface 8a of the resin filling hole 8 has an enlarged diameter, the lower opening 8 surface b has a reduced diameter, and the inner peripheral surface 8c is inclined. The upper opening surface 8 a of the resin filling hole 8 has substantially the same size (size) as the welding surface 4. In addition, the cross-sectional shape of the resin filling hole 8, the size (size) of the opening surface, the arrangement place, and / or the number of arrangement are arbitrary. Further, the truncated cone is a solid formed by the remaining portion obtained by cutting the head of the cone by a plane parallel to the bottom surface.

When the resin filling hole 8 is filled with the resin material, the lower opening surface 8b of the resin filling hole 8 is cut into the resin case 3 in a wedge shape. Therefore, it is possible to prevent the connection plate 6, particularly the welding surface 4, from floating during the wire bonding operation. That is, a downward stress F acting on the gap resin portion 9 located in the vicinity of the inner peripheral surface 8c of the resin filling hole 8 to prevent the connection plate portion 6 from floating is applied during the wire bonding operation. Thus, no gap is formed between the lower surface 6a of the connection plate 6 and the outer surface 3a of the resin case 3. As a result, as shown in FIG. 1, poor connection between the bonding wire 32 and the connection plate 6 can be prevented.

Next, a method of manufacturing the insert molded product 1 shown in FIG. 1 will be described. As shown in FIG. 6, the first terminal body 20 and the second terminal body 21 formed by press working are respectively locked on the upper surface 22a and the lower surface 22b of the first locking member 22, and the first terminal assembly 23 is formed. To form Similarly, as shown in FIG. 7, the third terminal body 24 and the fourth terminal body 25 are respectively locked on the upper surface 26a and the lower surface 26b of the second locking member 26, and the second terminal assembly 27 is assembled. In addition, the first stopper 2 of FIG.
2, and the second locking tool 26 of FIG.
c, 26c, and a plurality of locking projections 22d, 26d located on both sides of the locking grooves 22c, 26c, respectively.

As shown in FIGS. 6 and 7, the first terminal assembly 23 is disposed in the accommodation space 27a of the second terminal assembly 27. At the same time, the lower surface 22b of the first locking member 22 and the upper surface 26a of the second locking member 26 are assembled and insert-molded with a resin material to form a preformed product 28 in FIG. 8 (primary molding). At the time of insert molding, the first stopper 22 (FIG. 6)
And the second locking tool 26 (FIG. 7) are arranged in a molding die (not shown) so as to be respectively held. By insert-molding the preform 28 of FIG. 8 with a resin material,
An insert molded product 1 as shown in FIG. 1 is formed (secondary molding).

As shown in FIG. 1, wire bonding between the connection plate 6 of the insert molded product 1 and the printed circuit board 30 is performed as follows. As shown in FIG. 9A, a connection electrode 31 is provided on a printed circuit board 30. Bonding wire 3 made of a metal wire (for example, Au wire or Al wire)
9 is clamped by the clamp 33, and the terminal portion 32a of the bonding wire 32 is brought into contact with the connection electrode 31 as shown in FIG. Tip portion 34a of ultrasonic horn 34
Of the bonding wire 32 is welded to the connection electrode 31.
The ultrasonic horn 34 and the clamp 33 move synchronously,
The clamp 33 can be opened and closed freely.

After the welding, as shown in FIG. 9C, the ultrasonic horn 34 is moved from the connecting electrode 31 to the welding surface 4 of the connecting plate 6.
Move to. Following this, the clamp 33 is once opened and the bonding wire 32 is pulled out, and the clamp 33 is closed again to clamp the bonding wire 32. FIG.
As shown in FIG. 9D, the intermediate portion of the bonding wire 32 pulled out from the clamp 33 by the tip portion 34a of the ultrasonic horn 34 abuts against the welding surface 4, and then, as shown in FIG.
As shown in (E), the bonding wire 32 is welded to the welding surface 4. As shown in FIG. 9 (F), the ultrasonic horn 34
Then, the bonding wire 32 is cut at the distal end portion 34a, and the ultrasonic horn 34 and the clamp 33 are separated from the welding surface 4. Thus, the operation of wire bonding is performed.

[0015]

As described above, according to the first aspect of the present invention, the welding surface is provided on the connection plate for connecting the bonding wires. A lifting prevention means is formed around the welding surface. Therefore, after the insert molding, the connection plate does not rise. Thereby, it is possible to prevent poor connection between the bonding wire and the welding surface during wire bonding.

According to the second aspect of the present invention, the resin filling hole is formed in the connection plate portion located around the welding surface as a means for preventing the resin from being lifted, and the gap resin portion is filled in the resin filling hole. For this reason, after the insert molding, a stress having an action / reaction relationship with the stress that causes the welding surface to float acts on the gap resin portion. Thereby, it is possible to prevent a gap from being generated between the connection plate portion and the outer surface of the resin case.

According to the third aspect of the present invention, when the welding surface side is the upper surface, the resin filling hole has an inverted truncated cone shape in cross section. Therefore, the peripheral edge of the resin filling hole is narrower on the side opposite to the upper surface side than on the upper surface side, so that the resin filling hole bites into the resin case. This makes it possible to reliably prevent the welding surface from rising after insert molding.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing one embodiment of a terminal insert molded product according to the present invention.

FIG. 2 is a sectional view of a terminal in FIG. 1;

FIG. 3 is a view as seen from an arrow X direction in FIG. 2;

FIG. 4 is a view as seen from a direction indicated by an arrow Y in FIG. 1;

FIG. 5 is a sectional view taken along line ZZ in FIG. 4;

FIG. 6 is a perspective view of a first terminal assembly formed by locking a first terminal body and a second terminal body to a first locking member.

FIG. 7 is a perspective view of a second terminal assembly formed by locking a third terminal body and a fourth terminal body to a second locking member.

FIG. 8 is a perspective view showing a preformed product which is insert-molded by assembling a first terminal assembly and a second terminal assembly.

FIG. 9 is an explanatory view showing a work procedure of wire bonding for connecting a bonding wire to the welding surface of FIG. 1;
(A) is a state before the bonding wire is welded to the connection electrode of the printed circuit board, (B) is a state where the bonding wire is welded, (C)
Is a state in which the ultrasonic horn is moving while the clamp is opened and the bonding wire is sent out after welding, (D) is a state in which the bonding wire is in contact with the welding surface, (E)
Is a state where a bonding wire is welded to the welding surface, (F)
Is a state in which the bonding wire is cut after welding, and the connection electrode and the welding surface are electrically connected by the bonding wire.

FIG. 10 is a side view showing a conventional insert molded product of a terminal.

11 is a cross-sectional view showing a state in which the resin case in FIG. 10 has contracted and the terminal has been lifted.

FIG. 12 is a side view showing a case where the bending of the terminal in FIG. 10 is incomplete.

FIG. 13 is a cross-sectional view showing a state in which a bent portion of the terminal is corrected by a resin case by insert-molding the incompletely bent terminal of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insert molded product of terminal 2 Terminal 3 Resin case 4 Welding surface 6 Connection plate part 8 Resin filling hole 9 Gap resin part 32 Bonding wire

Claims (3)

[Claims] 1. An insert molded product of a terminal having a connection plate portion for connecting a bonding wire by wire bonding on an outer surface of a resin case, wherein the connection plate portion is provided with a welding surface for welding the bonding wire. An insert molded product for a terminal, wherein a floating prevention portion of the connection plate portion is formed around a welding surface. 2. The apparatus according to claim 1, wherein said lifting prevention means comprises a plurality of resin filling holes formed around said welding surface, and a gap resin portion filled in said resin filling hole. Insert molded products for terminals. 3. The terminal insert-molded product according to claim 2, wherein said resin-filled hole has an inverted truncated pyramid shape in cross section with said welding surface side as an upper surface.