JPH0354847A - Substrate for electronic component mounting - Google Patents

Abstract

PURPOSE:To prevent the generation of a crack in through holes, in which the heads of the conductor pins for the through holes can smoothly be inserted, and a conductor circuit by a method wherein tapered opening parts are respectively formed in the through holes of a substrate toward the sides of insertion of the conductor pins. CONSTITUTION:Each through hole 1 has a tapered opening part 11 to open widely outward on the side to insert a conductor pin 2 in the hole 1 and each conductor pin 2 has a tapered flange part 22 to come into contact to the opening part 11. In the case the pins 2 are respectively inserted in the holes 1, a pin- erection device with a multitude of the pins 2 aligned on it is aligned to the holes 1 and the pins 2 are inserted in the holes 1. The heads 21 of the pins 2 are first put in the opening parts 11 of the holes 1, then, the pins 2 come into contact to the wall surfaces of the holes, are guided and are inserted in the holes. Accordingly, the pins 2 are smoothly inserted in the holes 1, a crack is never generated in the open ends and inner walls of the holes or a conductor circuit and the generation of an internal strain in the inner walls of the holes 1 is also eliminated.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a board for mounting electronic components having conductor pins called a so-called Bingrinode array. Especially regarding the shape of the through hole.

[Prior art]

As shown in Fig. 8 and Fig. 9, the board 90 (for mounting electronic components called pin grid array) is
A conductor circuit 93 shaped like . A conductor circuit (not shown) formed on the side of another large board on which the base 90 is mounted.
are electrically connected by a plurality of conductor bins 8.

The conductor pin 8 is attached to the substrate 9 on which it is fixed or implanted.
It is extremely small, partly because 0 is small.

As shown in FIGS. 8 and 9, the conductor pin 8 has a head 81 and . The legs 83 and . One collar portion 8 provided between the two
2.

Also. For conductor pin 8. As shown by reference numeral 80 in FIGS. 8 and 9, there is a so-called standoff pin which has another lower collar portion 85 below the collar portion 82. Also. The conductor pin 8 having only the collar portion 82 described above is. This is called a standard pin.

This is because the present invention is a technology common to both types of bottles. The standard bottle is shown below as a representative.

Thus, the head 8l of the conductor pin 8 is inserted into the through hole 9l of the substrate 90, and an electrical connection is established between the two. In addition. In the figure, numeral 96 is a solder resist film, and 95 is an electronic component. 94 is bonding wire. 9l1 is the land of through hole 91. (Problem to be solved) By the way, the conductor pin 8 is inserted into the through hole 9l of the board 90.
When inserting the head 8l, as shown in Figure 10,
The head 81 is pressed into the through hole 91. This press-insertion is semi-forcibly performed using a pin stand device for a large number of conductor pins 8. That is, a large number of conductor bins 8 are set up in advance on a pin stand pallet (not shown). The base wire 90 is connected to the conductor pin 8 and the snow hole hole 9 from above the conductor pin 8.
Align position 1 and press. As a result, conductor pin 8
The head 81 of is press-fitted into the through hole 9l and fitted. Therefore, when the center line S of the through hole 91 and the center line P of the conductor bottle 8 coincide, smooth insertion is performed.

but. As shown in the figure. If the center lines S and P do not match, the head 81 of the conductor bottle 8 will forcefully press the open end 910 of the through hole 9l. Therefore, such pressure may cause cracks in the through hole. In addition, if such excessive pressure is applied, internal distortion occurs, so even if there is no cranking at the time of insertion, cranking will occur during the thermal cycle test. Also, when the above crank extends to the conductor circuit connected to the through hole. The conductor circuit is cut and the entire electronic component mounting board becomes a defective product.

SUMMARY OF THE INVENTION In view of these conventional problems, the present invention seeks to provide a board for mounting electronic components on which a conductor bottle can be smoothly inserted into a through hole.

[Means for solving problems]

The present invention provides an electronic component mounting board having a through hole into which a conductor pin is inserted, wherein the through hole has a tapered opening that widens outward on the side into which the conductor pin is inserted. A board for mounting electronic components is characterized by:

What should be noted in the present invention is that the opening on the conductor bottle insertion side of the through hole has a tapered opening.

The above tapered opening is. Even if it is straight (Fig. 2).
It may also be arc-shaped (Fig. 7). In addition, in the case of a straight hole, as shown in Figure 2, the opening angle α created by the center line of the through hole and the inner wall of the tapered opening is 20 to 7.
Preferably it is 0 degrees. Below 20 degrees. The conductor pin head is not inserted smoothly. On the other hand, if the angle exceeds 70 degrees, the diameter of the opening end becomes too large, and a sufficient contact area between the land and the collar of the conductor bottle cannot be secured. Furthermore, it is difficult to smoothly insert the conductor pin from the tapered opening into the linear inner wall of the through hole.

The conductor bin inserted into the above-mentioned through hole is usually the sixth
As shown in the figure, a type with a flat collar is used as in the conventional case. on the other hand. The conductor bins are as shown in Figures 1 and 3. It is preferable to use one having a tapered brim. In other words, this conductor bin is. The collar portion has a tapered portion that comes into contact with the tapered opening of the through hole.

[Action and effect]

In the invention of claim 1, the through hole of the electronic component mounting board is. Since the conductor pin has a tapered opening toward the insertion side, when inserting the head of the conductor pin into the through hole, the head is smoothly guided into the through hole.
inserted.

Therefore. Even if a large number of conductor pins are semi-forcibly inserted into a large number of through-holes using a bottle holder, the conductor pins are smoothly inserted into the through-holes. Also. As shown in Fig. 10 above, even if the center line of the through hole and the center line of the conductor bottle do not coincide with each other during insertion, the head of the conductor pin will be in contact with the wall of the tapered opening and inserted into the through hole. guided and inserted into the through hole.

Therefore, the head of the conductor pin is. It is inserted smoothly into the through hole and does not cause cranking to the open end or inner wall of the through hole, or even to the conductor circuit. Therefore, it is possible to provide an electronic component mounting board in which a conductor bottle can be smoothly inserted into a through hole.

Also. In the invention of the second claim. The conductor pin has the tapered flange, and the tapered portion of the flange is in contact with the tapered opening of the through hole. Therefore. The conductor bin is smoothly inserted into the through hole, and the conductor bin is firmly fixed to the board. Moreover, the same effect as the invention of the first claim can be obtained.

〔Example〕

First Embodiment An electronic component mounting board according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

As shown in Fig. 1, the electronic component mounting board of this example has a conductor pin 2 inserted into a through hole 1, and the through hole 1 expands outward toward the side where the conductor pin 2 is inserted. The conductor bottle 2 has a tapered opening II, and the conductor bottle 2 has a tapered collar 22 that contacts the tapered opening 11. Others. This is the same as the prior art described above. The through hole 1 is a hole that penetrates the substrate 9o, and is formed by applying an agate film inside the hole.

This through hole l has a land 13 at its upper opening. The lower opening forms a tapered opening 11. In the tapered opening 11, as shown in FIG. 2, the opening angle α between the center line S of the through hole 1 and the tapered opening 1l is 35 degrees. Further, the diameter X of the through hole l is approximately 0.55+m, and the diameter Y of the opening end of the tapered opening is approximately 1.2#.

On the other hand, conductor pin 2. As shown in FIG. 3, it has a head portion 2l, a leg portion 23, and a tapered collar portion 22 provided between the two. The collar portion 22 has a straight tapered portion 22 extending upwardly.
1. The lower end surface is a flat surface. However, the taper part 2
The taper angle β between the conductor pin 21 and the center line P of the conductor bottle is the same as the opening angle α of the through hole.

Also. The head of conductor pin 2 is. As shown in Figure 4, it has an elliptical shape. The diameter of its long diameter portion is slightly larger than the inner diameter of the through fitting 1. In addition. The shape of the head may be a cross-shaped head 210 as shown in FIG. 5, or may be circular.

next. The action and effect will be explained.

First, when inserting the conductor pins 2 into the through-holes 1, a large number of conductor pins 2 are aligned and set on a pin stand in a pin stand as in the conventional case. Next, above the heads 2l of the conductor bins 2 arranged in this way. The substrate 9o is placed with the head 2l and the through hole 1 aligned. Thereafter, the board 90 is lowered and pressed against the conductor pin 2, and the head 21 is inserted into the through hole l.

However. In the above insertion. Head 21 of conductor bottle 2
first enters the tapered opening ll of the through hole 1,
Next, it is inserted into through hole 1. At this time. When the center line S of the through hole 1 and the center line P of the conductor pin 2 do not match (see Fig. 10 above), the conductor pin 2
The head of the head contacts the lower part of the tapered opening I1 and is further guided in the direction of the through hole 1 along the tapered opening I1. Insert into through hole 1. Therefore, the conductor pin can be inserted smoothly into the through hole. therefore,
No cranking occurs on the open end of the through hole, on the inner wall, or even on the conductor circuit. Also. No internal strain occurs on the inner wall of the through hole during insertion.

Second Embodiment In this example, as shown in FIG.
Both the top and bottom surfaces are flat. Also. Conductor pin 3
has a head 31 and legs 33. This conductor pin 3 is similar to that of the prior art described above. Also. Through hole 1 of the board for mounting electronic components is. Like the first embodiment, it has a tapered opening 1l. The rest is the same as in the first embodiment, and also in this embodiment. The same effects as in the first embodiment can be obtained. Note that in the conductor pin 3, since the upper surface of the collar portion 32 is not tapered, the fit between the conductor pin 3 and the through hole 1 is slightly looser than in the first embodiment. but.
The space between the tapered opening It and the flange portion 32 is soldered together in a subsequent process to obtain a strong connection.

Third Embodiment This example is shown in Fig. 7. On the conductor pin insertion side of through hole l. An arcuate tapered opening 15 is provided. The rest is the same as the first embodiment. According to this example. When inserting conductor pins. The head of the conductor pin is inserted into the through hole 1 along the curved surface of the arc-shaped tapered opening 15. Therefore, compared to the first embodiment,
Insertion is even smoother.

Also, in this example, the conductor pin is . It has a curved tapered flange that contacts the tapered opening l5. Alternatively, it may have a flat plate-shaped flange (see FIG. 6).

Furthermore, in the explanation so far, the conductor bin has been described as a so-called standard bin, but it goes without saying that it can also be applied to standoff pins as described above.

[Brief explanation of drawings]

Figures 1 to 5 show the electronic component mounting board of the first embodiment. Figure 1 is a cross-sectional view. Figure 2 is an enlarged sectional view of the through-hole part, Figure 3 is a side view of the conductor pin, Figures 4 and 5 are plan views of the conductor bin, and Figure 6 is the electronic component mounting base of the second embodiment. Figure 7 is a sectional view of the main part of the electronic component mounting board of the third embodiment. 8 to 10 show a conventional board for mounting electronic components, FIG. 8 is a perspective view of the rear surface 1, FIG. 9 is a sectional view thereof, and FIG. 10 is an explanatory view when a conductor pin is inserted. 1...Through hole 1l 15...Tapered opening p 2.3...Conductor pin 21.31...Head 22...Tapered collar Applicant Ibiden Co., Ltd. Director

Claims (2)

[Claims] (1) In an electronic component mounting board having a through hole into which a conductor pin is inserted, the through hole has a tapered opening that widens outward on the side into which the conductor pin is inserted. Features: Board for mounting electronic components. (2) In a board for mounting electronic components in which a conductor pin is inserted into a through hole, the through hole has a tapered opening that widens outward on the side where the conductor pin is inserted, and the through hole has a tapered opening that expands outward on the side where the conductor pin is inserted. An electronic component mounting board characterized by having a tapered flange that contacts the tapered opening.