JP2001332371A - Terminal board and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a junction in the case of wire bonding. SOLUTION: A pair of lugs 28 is projected and formed from right and left side edges of a rear face 26B side in a flat plate part 26 of a terminal plate 25, and a bending part 27 is installed at the tip end. A fixed lower die 41 and an elevating upper die 42 are equipped, and a fitting groove 45 is formed at a lower molding surface 44 of lower the die 41, and a clearance groove 49 is formed at a vertical molding surface 48 of the upper die 42. A flat plate part 26 of the terminal plate 25 is reversed with front and rear, and fitted from the fitting groove 49 over to the clearance groove 49. The flat plate part 26 is supported by the lug 28 in a hanging state, and a front surface 26A is made to be floating from groove bottom of the fitting groove 45. The dies are closed and synthetic resin are filled between the both dies 41, 42, and when the molding product is taken out and top and bottom are reversed, the installed terminal board is obtained in the state that the terminal plate 25 is installed in parallel at the upper face of the base board made by synthetic resin in the state that the surface 26A is exposed. Because the die is not hit at the surface 26A to which the wire bonding is applied, a damage and tilting are avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal block connected to terminals and the like of a printed wiring board by wire bonding and a method of manufacturing the same.

[0002]

2. Description of the Related Art The structure of this type of terminal block is shown in FIG.
As shown in FIG. 1, a plurality of terminal boards 2 are juxtaposed on one surface of a synthetic resin base 1 with their surfaces exposed by insert molding. More specifically, each terminal board 2
Is placed on a fixed mold with its surface facing downward, and the movable mold is closed, and a synthetic resin material is filled and solidified between the molds, thereby solidifying the base 1 as described above. A terminal block 3 in which the surface of each terminal plate 2 is exposed flush is formed. Then, the surface of each terminal board 2 is connected to a terminal on a printed wiring board arranged near the terminal block 3 by wire bonding. Here, the wire bonding is to join the metals by pressing a terminal of a metal wire such as an aluminum wire against a terminal plate while applying high-frequency vibration. This type of terminal block is described, for example, in Japanese Patent Application Laid-Open No. H11-27369.

[0003]

By the way, the surface of the terminal plate 2 on which wire bonding is performed is required to have strict standards for smoothness and parallelism with the surface of the base 1. There is a situation where the force is reduced and a contact failure is caused. However, in the conventional device, when the terminal block 3 is formed, the mold is directly applied to the surface of the terminal plate 2, so that there is a dislike that the surface is inevitably damaged or the posture is inclined. However, there has been a problem that a situation in which the joining strength is reduced is easily caused. The present invention has been completed based on the above circumstances, and an object of the present invention is to improve the bonding performance when performing wire bonding.

[0004]

Means for Solving the Problems As means for achieving the above-mentioned object, the invention of claim 1 is directed to a synthetic resin base having a plurality of terminal plates exposed on one surface by insert molding. It is installed side by side in a state where
In a method of manufacturing a terminal block configured to be connected by wire bonding to each terminal of a counterpart arranged on a printed wiring board or the like, a mold for receiving the front side of the terminal plate and forming the one surface of the base On the molding surface of the base plate, a concave portion is formed at a position corresponding to the center portion of the surface of the terminal plate, and the base is placed in a state where the molding surface of the mold is applied only to the edge of the surface of the terminal plate. Is characterized by where it is molded.

According to a second aspect of the present invention, in the first aspect, a lug portion is formed so as to protrude from an edge of the terminal plate, and only the lug portion is applied to a molding surface of the mold. Has features. The invention according to claim 3 is the device according to claim 2, wherein the ear portion is formed in a stepped shape lowered toward the back surface side, and a portion other than a portion where the ear portion is provided on the surface of the terminal plate. However, it is characterized in that it is almost tightly fitted in the concave portion on the molding surface of the mold. According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, there is provided a counterpart mold which can be brought into contact with and separated from the mold which receives the surface side of the terminal plate, and the mold is closed. The base is formed by filling the cavity between the two molds with a synthetic resin material, and the terminal plate is provided with a bent portion bent on the back side, and the mating mold is provided. Is characterized in that when the mold is closed, the pressing portion provided on the mating die presses the bent portion.

According to a fifth aspect of the present invention, a plurality of terminal boards are juxtaposed on one surface of a base made of synthetic resin with their surfaces exposed by insert molding, and the surface of each terminal board is printed wiring. In a terminal block that is connected to each terminal on the other side arranged on a substrate or the like by wire bonding, an edge portion is formed to protrude at an edge of the terminal plate, and a front side of the terminal plate is received. The present invention is characterized in that a mold is applied only to the ears to form the one surface of the base, thereby forming the base. The invention according to claim 6 is characterized in that, in the invention according to claim 5, the ear portion is formed in a stepped shape that is lowered toward the back surface side.

[0007]

<Operation and effect of the invention><Invention of claim 1> When the front side of the terminal plate is received by the molding surface of the mold, the center of the surface corresponds to the concave portion of the molding surface, and only the edge portion is formed. The molding is performed in a state where it is applied to the mold. As a result, at the center of the surface of the terminal plate actually used for wire bonding, scratching or tilting can be prevented, and the bonding performance when performing wire bonding can be improved. As a result, it is possible to secure a good connection state.

<Inventions of Claims 2 and 5> Since the lugs are used to hold the terminal plate, the size of the terminal plate is minimized and the surface suitable for wire bonding is minimized. Can be secured over a wide range. <Inventions of Claims 3 and 6> By fitting a portion other than the portion where the ear portion is provided into the concave portion, the terminal plate is moved by receiving the resin pressure, and is particularly displaced in a direction parallel to the surface. Can be prevented. <Invention of Claim 4> When the mold is closed, the bent portion is sandwiched between the two dies, and in particular, the terminal plate is prevented from being displaced in the front and back directions.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. FIG. 1 shows an electronic control unit 10 including a terminal block 20 according to the present invention. The unit 10 includes a case 11 having a rectangular box shape with an upper surface opening. The unit 11 is attached to a predetermined position of a vehicle or the like by an attachment portion 12 provided at a corner or the like. A plate (not shown) is attached so that the inside is sealed. Case 1
A connector 15 protrudes from one side, and various electronic components can be accommodated therein, and bus bars 16 used for connection with the components are arranged at a plurality of locations. .

A terminal block 20 elongated in the left-right direction is formed at a position in the case 11 near the lower right corner of FIG.
A storage area for the printed wiring board 22 is provided in front of this. As will be described in detail later, the terminal block 20 has a plurality of terminal boards 25 arranged side by side on the upper surface of a synthetic resin base 21, while a printed wiring board 22 is provided in front thereof. The terminal board 25 is placed at a position substantially at the same height as the upper surface of the base 21, and each terminal board 25 is connected to a corresponding terminal 23 on the printed wiring board 22 and a wire (bonding wire) 2.
4.

Next, the structure of the terminal block 20 and a method of manufacturing the same will be described in detail. As shown in FIGS. 2 to 5, the terminal plate 25 has a flat plate portion 26 having a predetermined length at one end thereof, and two types of the flat plate portion 26 having different widths are provided. I have. At the tip of the flat plate portion 26, a back surface 26
A bent portion 27 bent at a right angle to the B side is formed over the entire width. A pair of left and right ears 28 project from the left and right side edges of the flat plate 26 at the center in the length direction. The lug 28 is made approximately half the thickness of the flat plate 26 by crushing with a press machine or the like.
6 and is formed flush with the back surface 26B of the sixth. In other words, the ear portion 28 is formed in a stepped shape one step lower than the surface 26A of the flat plate portion 26.

A molding die 40 shown in FIG. 5 is provided for molding the terminal block 20. The molding die 40 includes a fixed lower die 41 and a movable upper die 42. Lower mold 4
1 is provided with a horizontal lower molding surface 44, and a fitting groove 45 is formed on the lower molding surface 44, corresponding to the arrangement position of the terminal plate 25 described above. This fitting groove 45
Is a width at which the flat plate portion 26 of each terminal plate 25 fits tightly, and a depth larger than at least half of the plate thickness of the flat plate portion 26. In other words, the flat plate portion 26 of the terminal plate 25 is turned upside down to fit into the fitting groove. The groove bottom has such a depth that the groove bottom is separated from the surface of the flat plate portion 26 when it is fitted to the groove 45.

The upper mold 42 has an upper molding surface 47 facing the lower molding surface 44 of the lower mold 41, and a vertical molding surface 48 in contact with the back surface of the lower mold 41. Vertical molding surface 4
8 can be moved up and down while sliding on the back surface of the lower mold 41. On the vertical molding surface 48 of the upper mold 42, the lower mold 41
A vertical relief groove 49 is formed at each position corresponding to the fitting groove 45. The relief groove 49 is provided in the terminal plate 2.
5 have a width and a depth that allow the bent portion 27 to fit tightly. Further, the upper edge of the relief groove 49 is a pressing portion 50, and the pressing portion 50 is set to come into contact with the tip of the bent portion 27 when the upper die 42 is lowered to the die closing position.

Next, the terminal block 2 is formed by the molding die 40 described above.
The procedure for molding 0 will be described. First, as shown in FIG. 5, in a state where the upper mold 42 is raised to the mold opening position,
With the flat plate portion 26 of each terminal plate 25 turned upside down,
The fitting groove 45 is fitted over the escape groove 49 from the corresponding fitting groove 45. As shown in FIG. 6, the flat plate portion 26 is supported in a hanging manner with the ear portion 28 abutting against the side edge of the fitting groove 45, and its surface 26 </ b> A is floated from the bottom of the fitting groove 45. is there.
In addition, as shown in FIG. 8, the bent portion 27 is applied to the groove bottom of the escape groove 49.

Subsequently, when the upper mold 42 is lowered and closed, as shown in FIGS. 7 and 9, the distance between the upper molding surface 47 and the lower molding surface 44 is reduced, and the clearance groove 49 is formed. The holding portion 50 provided on the upper edge holds the tip of the bent portion 27. From this state, the molten resin is filled into the cavity formed between the upper and lower molds 42 and 41 through a gate (not shown). At this time, the filling pressure of the synthetic resin acts on the terminal plate 25, but the flat plate portion 26 is tightly fitted in the fitting groove 45, so that the movement of the flat plate portion 26 in the width direction is restricted, Further, the movement of the flat plate portion 26 in the thickness direction is also restricted by the fact that the ear portion 28 is in contact with the side edge of the fitting groove 45 and the tip of the bent portion 27 is pressed by the pressing portion 50.

When the synthetic resin solidifies after a lapse of time, the upper mold 42
Rises to open the mold, and the molded product is taken out. When this molded product is turned upside down and back and forth from the time of molding, as shown in FIG. 2, a terminal block 20 in which a plurality of terminal plates 25 are arranged at intervals on the upper surface of a synthetic resin base 21 is obtained. Can be
More specifically, as shown in FIG. 3, in the flat plate portion 26 of the terminal plate 25, half of the plate thickness on the back surface 26 </ b> B side is buried in the base 21, and the surface of the ear portion 28 is Become flush. Also, half of the plate thickness on the surface 26A side of the flat plate portion 26 protrudes from the upper surface of the base 21, and the surface 26A of the flat plate portion 26 is exposed to the outside. Further, as shown in FIG.
The bent portion 27 is hooked on the upper front corner of the terminal block 20. Then, as shown in FIG. 1, a printed wiring board 22 is disposed in front of the terminal block 20, and each terminal board 2
5 is a corresponding terminal 23 on the printed wiring board 22;
They are connected by wires 24.

In this embodiment, the flat plate portion 2 of the terminal plate 25 is used.
6 is received by the lower molding surface 44 of the lower mold 41 to form the upper surface of the base 21, a fitting groove 45 is formed in the lower molding surface 44, and the side of the fitting groove 45 is formed. Ear 28 on the edge
, The surface 26A of the flat plate portion 26 is supported in a hanging manner floating from the groove bottom of the fitting groove 45. In other words,
Since only the ears 28 are applied to the lower mold 41 and the lower mold 41 is not applied to the surface 26A of the flat plate 26, the surface 26A of the flat plate 26 is damaged or the surface 26A of the flat plate 26 is 21 without being inclined with respect to the upper surface. Therefore, when wire bonding is performed on the surface 26 </ b> A of the flat plate portion 26, the bonding force can be increased, and a good connection state can be obtained.

Since the ear portions 28 are formed on both side edges of the flat plate portion 26 so as to be applied to the lower mold 41, the size of the entire flat plate portion 26 is minimized, and the wire bonding is performed. Surface suitable for a wide range can be secured. In particular, it is effective for a flat plate 26 having a narrow width. Further, since the ear portion 28 is formed one step lower on the back surface 26B side, and approximately half of the plate thickness of the flat plate portion 26 is supported in a state of being buried in the fitting groove 45, the resin pressure during molding is reduced. The movement of the terminal plate 25 upon receipt, in particular, the displacement of the flat plate portion 26 in the width direction is effectively prevented.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention. (1) If it is possible to position the flat portion of the terminal plate in the mold by another means, it is not necessary to intentionally form the ear portion in a stepped shape. (2) When a wide area for wire bonding is secured on the surface of the flat plate portion, such as when the width of the flat plate portion of the terminal plate is large, the side of the flat plate portion surface is provided without providing the lug portion. The edge may be pressed by a mold.

[Brief description of the drawings]

FIG. 1 is a plan view of an electronic control unit having a terminal block according to an embodiment of the present invention in an open state;

FIG. 2 is a partial plan view of a terminal block.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a sectional view taken along line YY of FIG. 2;

FIG. 5 is a perspective view of a molding die.

FIG. 6 is a sectional view of the mold open state along the line XX in FIG. 2;

FIG. 7 is a sectional view of the mold closed state.

FIG. 8 is a cross-sectional view taken along line YY of FIG. 2 in a mold open state;

FIG. 9 is a sectional view of the mold closed state.

FIG. 10 is a perspective view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Terminal block 21 ... Base 22 ... Printed wiring board 23 ... Terminal 24 ... Bonding wire 25 ... Terminal board 26 ... Flat plate part 26A ... Surface (of flat plate part 26) 26B ... Back surface (of flat plate part 26) 27 ... Bending part 28 ... ear part 40 ... molding die 41 ... lower die 42 ... upper die 44 ... lower molding surface 45 ... fitting groove (recess) 47 ... upper molding surface 48 ... vertical molding surface 49 ... relief groove 50 ... holding part

Claims (6)

[Claims] 1. A plurality of terminal boards are arranged in parallel on one surface of a base made of synthetic resin with their surfaces exposed by insert molding, and the surface of each terminal board is arranged on a printed wiring board or the like. In a method for manufacturing a terminal block, which is connected to each terminal on the mating side by wire bonding, a molding surface of a mold that receives the surface side of the terminal plate and forms the one surface of the base, A recess is formed at a position corresponding to the center of the surface of the terminal plate, and the base is molded in a state where the molding surface of the mold is applied only to the edge of the surface of the terminal plate. Manufacturing method of the terminal block. 2. The method according to claim 1, wherein a lug is formed on an edge of the terminal plate, and only the lug is applied to a molding surface of the mold. 3. The terminal portion is formed in a stepped shape which is lowered toward a back surface side, and a portion other than a portion where the ear portion is provided on a surface of the terminal plate is the concave portion on a molding surface of the mold. 3. The method according to claim 2, wherein the terminal block is fitted approximately tightly. 4. A mating mold is provided which can be brought into contact with and separated from the mold for receiving the front side of the terminal plate, and a synthetic resin material is filled in a cavity between the molds with the mold closed. The base is to be molded, the terminal plate is provided with a bent portion bent to the back side, and when the mating mold is closed, the pressing portion provided in this mating mold is The method for manufacturing a terminal block according to claim 1, wherein the bent portion is pressed. 5. A plurality of terminal boards are arranged on one surface of a base made of a synthetic resin with their surfaces exposed by insert molding, and the surface of each terminal board is arranged on a printed wiring board or the like. In a terminal block that is connected to each terminal on the other side by wire bonding, an ear portion is formed to protrude at an edge of the terminal plate,
A terminal base, wherein the base is formed by receiving a surface of the terminal plate and applying a mold only to the ears to form the one surface of the base. 6. The terminal block according to claim 5, wherein the ear portion is formed in a stepped shape that is lowered toward the back side.