JPH0211730Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printed circuit board connector for interconnecting two or more printed circuit boards.

Conventionally, in order to stack printed circuit boards equipped with integrated circuits, etc., and connect the boards to each other with connectors,
For example, as shown in FIGS. 1 and 2, connector d is attached to printed circuit boards a and b by inserting and soldering the lead parts of female contacts c into the through holes of boards a and b, respectively, and The lead part of the female contact c of a was fitted into the contact part of the female contact c of the printed circuit board b. Thus, when two or more printed circuit boards are stacked, a considerable amount of space is required and the material costs are also high.

Further, conventional electrical connectors have pins provided with a plurality of contact portions along the longitudinal direction for electrically connecting with through holes of a plurality of printed circuit boards, and the contact portions are sheared along a plane. It is known to consist of two legs that are bent in opposite directions, possibly separated from each other.
(Refer to Japanese Patent Application Laid-open No. 172880/1983). This method requires high machining accuracy in order to bring the contact portion into contact with the through hole at a constant contact pressure, which has the disadvantage of increasing machining costs.

The purpose of the present invention is to eliminate the inconveniences of the conventional ones, and an even number of contact pins 3 are provided on an insulator 1, each having a plurality of protrusions 2 that contact the through holes of a plurality of laminated printed circuit boards. The protrusions 2 of adjacent contact pins 3 are formed in a direction symmetrical with respect to an imaginary line parallel to these between the adjacent contact pins 3, and the protrusions 2 of adjacent contact pins 3 are arranged in parallel. When the contact pins 3 are inserted into the through holes of a plurality of printed circuit boards with matching protrusions 2 formed in opposite directions, the portions of the contact pins 3 between adjacent protrusions 2 are bent, and the elastic force caused by the bending causes the contact pins 3 to bend. It is characterized in that the protrusions 2 are brought into pressure contact with the through holes of the plurality of printed circuit boards, respectively.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows an embodiment of the present invention for connecting a plurality of printed circuit boards for integrated circuits.

In the figure, reference numeral 1 denotes a frame-shaped insulator, and an even number of contact pins 3, for example, 10, are implanted on each side of the insulator 1. The portion of the contact pin 3 that protrudes below the insulator 1 is used as a mounting portion for a printed circuit board called a motherboard, and the portion with the upper protrusion 2 is used as a mounting portion for a printed circuit board for an integrated circuit. Each of the contact pins 3 implanted in the insulator 1 has, for example, four protrusions 2 spaced apart from each other by a distance corresponding to the thickness of a printed circuit board for an integrated circuit, and adjacent protrusions 2 are oriented in opposite directions. In addition, as clearly shown in FIG. 4, the protrusion 2 closer to the tip of the contact pin 3 was formed with a smaller protrusion length. Further, as shown in FIG. 4, the corresponding pair of protrusions 2 of adjacent contact pins 3 are arranged symmetrically with respect to an imaginary line L parallel to these between adjacent contact pins 3, that is, as shown in FIG. I tried to face them or face them the other way.

FIG. 5 shows a printed circuit board 4 for integrated circuits.

In the figure, reference numeral 5 denotes an integrated circuit section mounted on the substrate 4 and connected to the printed wiring on the substrate 4;
is a through hole having a conductive part 9 connected to the printed wiring on the wall surface; the contact pin 3 of the connector is inserted into the through hole 8, and the conductive part 9, and therefore the integrated circuit part 5, is connected to the contact pin 3. I tried to connect to .

Next, the effect when the connector of the present invention is attached to the integrated circuit printed circuit board 4 will be explained.

Since the contact pin 3 has at least two protrusions 2, for example four protrusions 2, the contact pin 3 is inserted into the through holes ₈₁ to ₈₄ of the four printed circuit boards ₄₁ to ₄₄ , for example, as shown in FIG. When inserted, the effective diameter of the contact pin 3 is the through hole 8.
₁ to ₈₄ , the four protrusions 2 apply spring force (indicated by arrows) to the conductive portions 9 on the walls of the through holes ₈₁ to ₈₄ of the printed circuit boards ₄₁ to ₄₄ , respectively. ), but the protrusions 2 of the adjacent contact pins 3, 3 ₁ and 3 ₂ are connected to the printed circuit board 4.
₁ , 4 ₃ facing outward, printed circuit boards 4 ₂ ,
Since the contact pins 4 ₄ face inward and are symmetrical, the spring forces of the projections 2 of the contact pins 3 ₁ and 3 ₂ on the printed circuit boards 4 ₁ to 4 ₄ cancel each other out. In this way, the printed circuit boards 4 ₁ to 4 ₄ do not shift even if they are not fixed to each other, and the contact pins 3 ₁ are connected to the conductive parts 9 of the through holes 8 ₁ to 8 ₄ .
The protrusions 2 of 3 and ₂ come into pressure contact, and a good electrical contact can be obtained between them.

Note that the protrusion _length of the protrusion 2 of the contact pin 3 is smaller as it is closer to the tip, so
In the process of insertion into the through-holes 8 ₁ to 8 ₄ of 4 ₄ , the protrusion 2 near the tip comes into less contact with the conductive portion 9, and mechanical wear due to contact is reduced.

As described above, according to the present invention, an even number of contact pins 3 each having a plurality of protrusions 2 that contact the through holes of a plurality of laminated printed circuit boards are arranged in parallel on an insulator 1, and adjacent contact pins The protrusions 2 of the contact pins 3 are formed in a symmetrical direction with respect to an imaginary line parallel to the adjacent contact pins 3, and the adjacent protrusions 2 of each contact pin 3 are formed in opposite directions to each other. When the contact pins 3 are inserted into the through holes of the plurality of printed circuit boards, the portion between the adjacent protrusions 2 of the contact pin 3 is bent, and the elastic force caused by the deflection causes the plurality of protrusions 2 to pass through the plurality of printed circuit boards. The feature is that each hole is press-fitted, so compared to the conventional former which requires connectors according to the number of printed circuit boards, the structure is simpler and cheaper, it can be made smaller, and it is easier to assemble. It has the advantage of being easy to work with. Also,
Compared to the conventional latter method, the machining accuracy may be lower, and the machining cost is lower.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional example, FIG. 2 is a sectional view thereof, FIG. 3 is a perspective view of an embodiment of the present invention, FIG. 4 is an enlarged plan view of an arbitrary number of contact pins arranged, and FIG. Figure 5 is a plan view of a printed circuit board for integrated circuits.
FIG. 6 is a sectional view showing the connection state between the printed circuit board and the contact pins. DESCRIPTION OF SYMBOLS 1... Insulator, 2... Protrusion, 3... Contact pin, 4... Integrated circuit board, 5... Integrated circuit part, 8... Through hole, 9... Conductive part.

Claims (1)

[Scope of utility model registration request] An even number of contact pins 3 each having a plurality of protrusions 2 in contact with through holes of a plurality of laminated printed circuit boards are arranged in parallel on an insulator 1,
The projections 2 of adjacent contact pins 3 are formed in a symmetrical direction with respect to an imaginary line parallel to these adjacent contact pins 3, and the adjacent projections 2 of each contact pin 3 are formed in opposite directions. When the contact pins 3 are inserted into the through holes of a plurality of printed circuit boards, the portions of the contact pins 3 between adjacent protrusions 2 are bent, and the elastic force caused by the deflection causes the plurality of protrusions 2 to A printed circuit board connector characterized by being press-contacted to each through-hole of the printed circuit board.