JPH0864274A - Connector pin connecting apparatus and assembling method therefor - Google Patents

Abstract

PURPOSE: To provide a connector pin connecting apparatus and an assembling method, by which connecting work can be carried out easily and bad effects upon the joining of a connector housing and a circuit substrate can be lessened. CONSTITUTION: A porous substrate side terminal 4 (made of, for example, a copper fiber wool or a fiber mat or a fiber woven body) is joined with the contact conductor part 3 of a circuit substrate 2 and a connector pin 12 of a connector is driven into the substrate side terminal 4 to electrically connect the circuit substrate to the connector pin 12. In this way, no resilient force is generated in the insertion direction of the connector pin 12 in the substrate side terminal 4 into which the connector pin 12 is inserted after the connector pin 12 is inserted into the substrate side terminal 4 and thus no joining problem occurs between the circuit substrate 2 and the connector housing 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for a contact conductor portion of a circuit board and a connector pin of a connector fixed to the circuit board, and an assembling method.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a conventional structure for mounting connector pins on a circuit board. The connector 1 includes a connector housing 11 made of a resin-molded block and connector pins 12 fixed to the connector housing 11. The connector 1 is fixed to a circuit board 2. The connector pin 12 is wire-bonded to the contact conductor portion 3 on the circuit board 2.

Another example of a conventional structure for attaching connector pins to a circuit board is shown in FIG. In this example, instead of wire bonding in FIG. 7, both ends of the lead wire 15 are individually welded to the contact conductor portion 3 and the connector pin 12.
Another example of a conventional structure for attaching connector pins to a circuit board is shown in FIG. In this example, instead of the wire bonding shown in FIG. 7, the bending elasticity of the connector pin 12 is used to press the tip end portion of the connector pin 12 against the contact conductor portion 3.

In Japanese Utility Model Laid-Open No. 5-82078, one end of a coil spring is welded to a contact conductor portion (the contact conductor portion) on a circuit board, and a rod-shaped connector pin is pushed into the coil spring from above. It proposes to make an electrical connection. Further, Japanese Patent Laid-Open No. 4-370672 discloses
It is proposed to press-fit the connector pin directly into the through hole.

[0005]

However, in the connection method of FIGS. 7 and 8 described above, wire bonding or welding (including brazing and soldering) is required, which complicates the process and increases the processing cost. . In addition, there is also a problem in that the joint portion undergoes fatigue fracture due to the difference in the coefficient of thermal expansion between the joint portions.

In the connection system shown in FIG. 9, there is a limit to the bending elasticity of the connector pin due to restrictions such as the strength of the connector housing that supports the connector pin and the connection strength between the connector housing and the circuit board. Further, if the flat surface of the connector pin is simply brought close to the flat surface of the contact conductor portion and pressed, the oxide film or the minute unevenness existing in these contact portions may cause the connector pin and the contact conductor portion to be separated from each other. There is a problem that the contact resistance cannot be reduced sufficiently. Therefore, when the pressing force is increased, when the total number of pins is large, there arises a problem that the adhesive portion between the connector housing and the circuit board is peeled off. For example, referring to FIG. 9, the bonding elasticity A of the connector housing 11 and the circuit board 2 is caused by the bending elasticity of the connector pin 12.
Then, the reaction force in the peeling direction will work.

In the connection method using the coil spring of the former publication, the coil spring has a special shape, and a normal component mounting machine for adsorbing a component and arranging the component at a predetermined position on the circuit substrate automatically mounts it on the substrate. The difficulty arises that a large number of coil springs must be arranged manually or a special dedicated mounting system must be devised. The technique of press-fitting the connector pin proposed in the latter publication directly into the through hole requires a dedicated connector pin press-fitting machine,
Further, it takes time and effort to provide a large through hole on the circuit board.

The present invention has been made in view of the above problems, and provides a connector pin connecting device and a method for assembling the same which can simplify the process and can reduce the adverse effect on the joining between the connector housing and the circuit board. Is the purpose.

[0009]

The first structure of the present invention is as follows.
A porous board-side terminal joined to a contact conductor portion formed of a conductor layer formed on the main surface of the circuit board, and fixed to a connector housing fixed to the circuit board and thrust into the board-side terminal. A connector pin connecting device comprising: a connector pin.

A second structure of the present invention is characterized in that, in the first structure, the terminal on the substrate side further has a fiber block body made of conductive cloth or conductive fiber wool. According to a third structure of the present invention, in addition to the first or second structure, the board-side terminal is pierced by the connector pin and is pressed against the circuit board by the connector housing supporting the connector pin. It is characterized by that.

According to a fourth aspect of the present invention, the suction head of the component mounting machine sucks the upper surface of the board-side terminal and places it on the contact conductor portion, and thereafter, it is arranged on the lower surface of the board-side terminal. Of the connector pin connecting device for reflowing the solder layer formed to bond the board-side terminal to the contact conductor portion, and thereafter fixing the connector housing to the circuit board and projecting the connector pin into the board-side terminal. It is an assembly method.

[0012]

According to the first structure of the present invention,
A porous (for example, copper fiber wool) board-side terminal is joined to the contact conductor portion of the circuit board, and a connector pin of the connector is inserted into the board-side terminal to electrically connect the circuit board and the connector. With this configuration, after the board-side terminal into which the connector pin is inserted and the connector pin are inserted, no large reaction force is generated in the connector pin injecting direction, which causes a problem in joining the circuit board and the connector housing. Never. Further, since the connector pin rubs or cuts the copper fiber wool or the like inside the board-side terminal, those oxide films are destroyed and the contact resistance is reduced.

Furthermore, since the above-mentioned connection is completed by the operation of relatively moving the circuit board to a predetermined position of the connector and setting it, the connecting step is extremely simple. According to a second configuration of the present invention, in addition to the first configuration, the board-side terminal is made of conductive cloth or conductive fiber wool. Such a board-side terminal having a fiber mat structure is easy to manufacture, and since each fiber is pressed against the inserted connector pin by its own bending elasticity,
Good contact is obtained.

According to a third structure of the present invention, in the first or second structure, the board-side terminal further comprises:
Since it is pierced by the connector pin and pressed against the circuit board by the connector housing that supports the connector pin, the fiber mat-shaped substrate side terminal on which the connector pin is pierced is compressed and strongly pressed against the connector pin. The resistance can be further reduced.

According to a fourth aspect of the present invention, the suction head of the component mounting machine sucks the upper surface of the board-side terminal and places it on the contact conductor portion, and then the solder disposed on the lower surface of the board-side terminal. The layers are reflowed to bond the board-side terminals to the contact conductors, and then the connector housing is fixed to the circuit board and the connector pins are pushed into the board-side terminals. Therefore, the function and effect described in the first configuration are obtained. Can be performed in a simple process.

[0016]

【Example】

(Embodiment 1) FIG. 1 is a longitudinal sectional view of an essential part showing an example of a connector pin connecting device and an assembling method thereof according to the present invention. 1 is
It is a case with a lower end opening formed by resin molding, and the right end portion of the case 1 in the drawing is a connector housing 10.

The connector housing 10 has a recess 11 having a right end opening, and the recess 11 has a plurality of connector pins 1.
One end of 2 (one in the figure) projects. The central portion of each connector pin 12 is fixed to the side wall of the case 1,
The other end of each connector pin 12 projects inside the case. As shown in FIG. 2, the connector pins 12 are made of elongated flat copper plates, and are arranged as shown in FIG. 2 in a posture in which their principal surfaces are horizontal. As shown in FIG. 2, the other end of the connector pin 12 has a sharp tip and is projected into the board-side terminal 4 described later.

The lower end opening of the case 1 is closed by a base 13 made of an aluminum flat plate to form a sealed space inside. More specifically, the peripheral edge of the base 13 is bonded to the peripheral edge of the case 1 surrounding the lower end opening. The circuit board 2 is adhered to the upper surface of the base 13, and a large number of electronic circuit elements (not shown) are attached to the circuit board 2.
Is installed and wired. Further, a contact conductor portion (so-called contact conductor portion) is provided on the upper surface of the right end portion of the circuit board 2.
3 is printed and fired, and the board-side terminal 4 is bonded onto the contact conductor 3 by reflowing a solder paste (not shown).

The board-side terminal 4 is composed of a fiber integrated block body in which copper fiber wool is integrated. next,
An assembling method of this connector pin connecting device will be shown. First, necessary electronic circuit elements (not shown) and the board-side terminal 4 are mounted on the circuit board 2 by a component mounting machine.

Although not shown, this component mounting machine itself has a vacuum suction head, and the suction surface at the lower end of this vacuum suction head sucks the upper end surface of the board-side terminal 4 to contact the circuit board 2. It is placed on the conductor part 3. A solder paste is applied to the lower surface of the board-side terminal 4, and the solder-paste is melted and solidified by heating in a reflow furnace and subsequent cooling, and the board-side terminal 4 is joined to the contact conductor portion 3. It of course,
It goes without saying that solder paste may be printed on the contact conductor 3 side.

Next, the circuit board 2 is adhered to the base 13, the base 13 is set at a predetermined position of the lower end opening of the case 1, and the connector pin 12 is sharpened by displacing it from the front to the rear in the figure. The tip portion is pierced into the board-side terminal 4, and the base 13 closes the lower end opening of the case 1. In this state, the base 13 is bonded to the case 1 to complete the assembly.

By doing so, it is possible to achieve the above-described effects. (Embodiment 2) Another embodiment will be described with reference to FIG. In this embodiment, the connector pin 12 of the first embodiment is modified, and the inner protruding portion of the connector pin 12 that protrudes inside the case 1 is formed into a bifurcated harpoon shape. With this configuration, the tip end portion of the connector pin 12 has the crotch portion 12a.
And the crotch portion 12 where the cross-sectional area increases toward
Due to the presence of a, as the connector pin 12 is pushed in, the fiber mat of the board-side terminal 4 is compressed, whereby the connector pin 12 and the board-side terminal 4 are compressed.
The contact resistance with is reduced. (Embodiment 3) Another embodiment will be described with reference to FIGS. FIG. 4 shows the connector pin 12 before it is inserted into the board-side terminal 4, and FIG. 5 shows it after it is inserted.

This embodiment differs from the first embodiment only in the direction in which the connector pin 12 is pushed in, that is, the relative movement direction of the circuit board 2 with respect to the case 1. That is, as apparent from FIGS. 4 and 5, the connector pin 12 is pierced at a right angle to the main surface of the circuit board 2. More specifically, a through hole 20 is formed in the circuit board 2 into which the connector pin 12 is fitted.
A rectangular ring-shaped contact conductor portion 3 is formed around 0 by printing and firing a silver paste. The solder paste layer 5 printed on the contact conductor portion 3 joins the board-side terminal 4 to the contact conductor portion 3 by subsequent reflow.

By doing so, even when the circuit board 2 is moved in the direction perpendicular to the main surface to align the circuit board 2 and the connector housing 10, the mat piercing method of the present invention can be adopted. . In addition, 10a is a connector housing 1 for supporting the connector pin 12.
It is a connector pin support portion protruding from 0, and is simultaneously molded integrally with the connector housing 10 by resin. (Embodiment 4) Another embodiment will be described with reference to FIG.

In this embodiment, in the structure of Embodiment 3 shown in FIG. 5, after the connector pin 12 is pierced into the board-side terminal 4, the board-side terminal 4 or the conductive fiber mat is attached to the circuit board 2 by the connector pin supporting portion 10a. (Specifically, it is pressed against the contact conductor portion 3). In this way, since the board-side terminal 4 is compressed after the above-mentioned piercing, the board-side terminal 4 and the connector pin 12 are
Better contact with.

Further, in this embodiment, since the copper plate 10b is adhered to the top surface of the connector pin support portion 10a so as to surround the connector pin 12 in a ring plate shape, the connector pin 12 is provided from the board side terminal 3 through the copper plate 10b. It is also possible to make an electrical connection to, and to further reduce the contact resistance.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing a connector pin connecting device according to a first embodiment of the present invention.

2 is a plan view of the connector pin 12 of FIG. 1. FIG.

FIG. 3 is a plan view of a connector pin 12 according to another embodiment.

FIG. 4 is a vertical cross-sectional view of a main part (before connection) showing a connector pin connecting device according to a second embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a main part (after connection) showing a connector pin connecting device according to a second embodiment of the present invention.

FIG. 6 is a longitudinal cross-sectional view of a main part (after connection) showing a connector pin connecting device according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional side view showing a state in which the conventional connector pin 12 and the contact conductor portion 3 of the circuit board 2 are connected.

8 is a cross-sectional side view showing a state in which the conventional connector pin 12 and the contact conductor portion 3 of the circuit board 2 are connected.

FIG. 9 is a sectional side view showing a state in which a conventional connector pin 12 and a contact conductor portion 3 of a circuit board 2 are connected.

[Explanation of symbols]

Reference numeral 1 is a case, 10 is a connector housing, 2 is a circuit board, 3 is a contact conductor portion, 4 is a board-side terminal, and 12 is a connector pin.

Claims (4)

[Claims] 1. A porous board-side terminal joined to a contact conductor portion formed of a conductor layer formed on a main surface of a circuit board, and a board-side terminal fixed to a connector housing fixed to the circuit board. A connector pin connecting device, comprising: a connector pin that is inserted into a terminal. 2. The connector pin connecting device according to claim 1, wherein the board-side terminal has a fiber block body made of conductive cloth or conductive fiber wool. 3. The connector pin connecting device according to claim 1, wherein the board-side terminal is pierced by the connector pin and is pressed against the circuit board by the connector housing that supports the connector pin. 4. A suction head of a component mounting machine sucks an upper surface of the board-side terminal and places it on the contact conductor portion, and then reflows a solder layer disposed on the lower surface of the board-side terminal. By assembling the board-side terminal to the contact conductor portion, and then fixing the connector housing to the circuit board and projecting the connector pin into the board-side terminal. .