JPS61264688A - Press-fit type connector pin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Table of contents] - Overview - Field of industrial application (Figures 7 and 8) - Prior art (Figures 3.4.5) - Problems to be solved by the invention (Figures 3.4.5) Figure 6) - Means, action, and embodiments for solving the problem (Figures 1 and 2) Effects of the invention [Summary] - Deformation at the longitudinal end of the joint (press-fit part) of the press-fit type connector bin By providing an escape hole, the connector pin is prevented from warping and deforming during press-fitting into the printed board through-hole, and the press-fitting process can be automated.

[Industrial application field]

The present invention relates to a press-fit type connector pin that is press-fitted into a through-hole of a printed board such as a backboard of an electronic or communication device, and particularly relates to the structure of a joint portion that makes contact with the through-hole.

Generally, there are two methods for fixing connector pins that transmit electrical signals to a printed circuit board: one is to insert the pin into a through hole and fix the pin by soldering, and the other is to press fit the pin into the through hole and connect the pin without soldering. In the former case, since soldering requires a process and soldering requires equipment, there are various manufacturing problems.

For this reason, the latter method tends to be used more frequently, and various structures have been developed for joints that make contact with through holes. In this solderless joining method, there are two methods: one in which the joint is formed into a rigid structure, and the other in which the joint is formed in a flexible structure with spring properties, and the present invention relates to the latter.

FIG. 7 is a diagram showing an example of use of this type of press-fit connector pin, and FIG. 8 is a sectional view taken along the line G and -Gt in FIG. 7.

A joint portion 10a (FIG. 8) of the connector pin 10 is press-fitted into a through hole l1a (FIG. 8) of a backboard (motherboard) 11 made of a printed circuit board. A large number of pins 10 are arranged in a row at a minute pitch (for example, 2.54 m11 pitch), and a guide case 12 is provided surrounding these pins 10. A printed board connector 16 disposed on a printed board (daughter board) 15 is inserted into the guide case 12 (in the direction of arrow H), and the contact portion 10b of the pin 10 (FIG. 8) is inserted into the contact pin 16a of the connector 16. The backboard 11 and the printed circuit board 15 are electrically connected to each other. Further, a cable connector (not shown) or the like is fitted and connected to the terminal portion 10C (FIG. 8) of the pin 10 in substantially the same manner as in the case of the contact portion 10b. Also, pin 10
is sometimes used as a wrapping terminal. In this way, the connector bin 10 includes the printed board connector 16,
Because cable connectors and the like are fitted and connected, and because the press-fitting process (driving process) is performed on multiple backboards 11 with a small pinch, the plate of the backboard 11 is not warped or deformed after being press-fitted into the backboard 11. It is important to press fit perpendicular to the surface.

[Conventional technology]

3 to 5 are explanatory diagrams of conventional examples. Fig. 3 shows the first conventional example 20-1, Fig. 4 shows the second conventional example 20-2, and the fifth conventional example.
The figures are diagrams showing main parts of the third conventional example 20-3. Incidentally, in FIGS. 3 to 5, the same parts are designated by the same reference numerals. Also, in Figure 3.4.5,
(a) Figure 1.2.3 Conventional example (20-1, 20-2,
2O-3), (o1 is a perspective view of the main parts of the press-fit connector bins (20-1, 20-2, 2O-3)
A, 22B, 22C). These conventional examples No. 1.2.3 basically consist of joint portions (22A, 22B, 22C), and contact portions 21 and terminal portions that are continuously formed at both longitudinal ends of these joint portions. It consists of 23.

The first conventional example 20-1 shown in FIG.
No.), the cross section of the joint 22A is continuously formed into a deformed F-shape as shown in Figure (o), and the thickness of the uneven portion CF in the center is greater than the thickness of AB and DE at both ends. The through hole 30 is also thinly formed, has a spring property near the center, and the four ridgeline portions A, B, D, and E at both ends are joined to the through hole 30 by elastically contacting the through hole 30 due to the spring property. In this case, each ridgeline portion A, B.

D and E are formed at obtuse angles, so through holes 30
It is stably bonded to the through-hole without damaging the inner surface.

The second conventional example 20-2 shown in FIG.
The cross section of B (o1) is continuously formed in a C-shape as shown in the figure, has spring properties as a whole, and the outer periphery is connected to the through-hole meter O by elastic contact due to the spring properties. Ru.

The third conventional example 20-3 shown in FIG.
The cross section of (o1) is formed continuously in a V-shape as shown in the figure, with the central part (B part) mainly having spring properties, and the three parts of the central part B and the ridgeline parts A and C at both ends being through-holes. Hall 3
0 in elastic contact and bonding due to its spring properties.

Although not shown, the cross section of the joint is continuously formed in a U-shape with a square bent part, and two of the bent parts
A connector pin has also been proposed in which a connector pin is formed so that a total of four locations, including the two locations on the ridgeline portions at both ends, are elastically contacted and joined to the through hole, and furthermore, the cross section of the joint portion is Connector pins continuously formed in a U-shape with round bends have also been proposed.

[Problem that the invention seeks to solve]

In each of the above-mentioned conventional examples, the cross section of the joint is formed into a continuous cross section such as C-shape, 7-shape, U-shape, etc. Therefore, when press-fitting into the printed board through hole, the cross section of the joint is The connector pin is compressed from the outside in the lateral direction and elastically deforms and press-fitted into the through-hole, so this deformation in the cross section is partially converted into deformation in the longitudinal direction, and the connector pin after press-fitting is pressed into the printed board. There is a problem that the plate is warped and deformed with respect to the vertical line of the plate surface. FIG. 6 is an explanatory diagram of such a problem. As shown in the figure, the connector pin 20 indicated by the solid line is press-fitted into the through hole 25 perpendicularly to the plate surfaces 26a and 26b of the printed board 26, and the connector pin 2OA indicated by the broken line is inserted into the plate surface 26a and 26b of the printed board 26. It shows a state in which it is warped and deformed in the vertical direction of the surfaces 26a and 26b and is press-fitted into the through hole 25. Usually, a plurality of connector bins of this type are connected to a carrier (band-shaped portion) in parallel and are press-fitted row by row into through-holes on a printed board at a minute pitch (for example, 2.54 mm pitch). Therefore, when this type of connector pin is automatically press-fitted with an automatic press-fitting machine, if the connector pin 20A (broken line) in Fig. 6 is warped and deformed after press-fitting, the press-fitting machine will not fit properly when press-fitting the next connector pin. Problems arise, such as the chuck contacting and deforming the connector pin that has already been press-fitted, or contacting and damaging the contact portion provided by coating the connector pin with noble metal or the like. Therefore, it is almost impossible to automate the press-fitting process in the conventional example, and it is currently performed manually. For this reason, there is also the problem that the press-fitting process lacks workability. Note that the direction of this warp deformation is not limited to a certain direction depending on the shape of the cross section of the joint, the size of the wall thickness, etc., but generally the warp deforms toward the bottom wall side of the cross section of the joint in many cases.

The present invention was created in view of the above-mentioned problems, and provides a press-fit type connector pin having a structure that can prevent the occurrence of warping and deformation in the vertical direction of the board surface of a printed board when press-fitting into a printed board through hole. It is intended to.

[Means for solving problems]

In order to solve the above-mentioned problems, in the present invention, the cross-sectional shape of the joint part that is press-fitted into the through-hole of the printed board and is in contact with the through-hole is a continuous cross-section such as a C-shape, a U-shape, or a 7-shape. The present invention provides a press-fit type connector pin, characterized in that, in the formed press-fit type connector pin, an escape hole 34 for preventing warp deformation is provided in at least one of both ends in the longitudinal direction of the joint portion 32.

[For production]

By providing the escape hole 34, deformation in the longitudinal direction during press-fitting of the connector pin can be absorbed (allowed to escape), thereby preventing warping deformation.

〔Example〕

FIG. 1 is a diagram showing essential parts of an embodiment (30) of the present invention, and FIG. 2 is an overall side view of the embodiment (30) of the present invention.

In Figure 1, (a) is a front view of the main part, (b) is (a)
Right side view seen from the direction of arrow J, (At is (A) +
-Kz line longitudinal cross-sectional view) is the rear view of (A), (e) is the L r L X-ray cross-sectional view of (A), (→ is (M of punishment, -Mg ) is (a)'s N, -'Nt
A horizontal cross-sectional view.

The present embodiment (press-fit type connector pin) 30 is made of a material with spring properties such as phosphor bronze, and is basically shown in FIG.
b) and as shown in Figure 2, the printed board through-hole (
It is composed of a joint part 32 that is press-fitted into a joint (not shown), and a contact part 32 and a terminal part 33 that are continuously formed at the upper and lower ends of this joint part 32, respectively, and the joint part 32 has the characteristics of the present invention. It is something. In addition, the part indicated by the two-dot chain line in FIG. 2 indicates the carrier (band-shaped connected body) 40,
41 indicates a notch. In reality, a plurality of (for example, 32) connector pins 30 of this embodiment are installed in this carrier 40.
Parallel (<
(teeth-like) and are connected via a notch 41. and,
Connector pin 30 is inserted into the through hole in the direction of arrow P (FIG. 2) in this connected state, and joint portion 32 is press-fitted. After the connector pin 30 is press-fitted into the through hole, the carrier 40 is broken and separated from the notch 41.

Now, in FIG. 1, most of the vertical center of the joint 32 shown in FIG. As shown in FIG.
((), &N, ni), &ti) (see figure) are formed through the hole. The U-shaped cross section of the joint 32 is (as shown in Figure 4,
The thickness of the bottom wall portion 32a is formed to be thinner than that of the left and right side walls 32b and 32c, and the bottom wall portion 32a has spring properties, and the ridgeline portions of the left and right side walls 32b and 32c A,
The four locations B, C, and D are elastically contacted and joined to the through holes (not shown) due to their spring properties. And these ridgelines A and B.

Since C and D are formed in an obtuse angle shape, they can be stably press-fitted into the through hole without damaging the through hole. The upper and lower ends of the joint 32 are connected to 61. By forming the connector into a C-shaped cross section as shown in FIGS. ) and (G), the strength of the upper and lower ends, that is, the portion near the through hole of the connector pin 30 can be increased. The joint portion 32 having such a cross-sectional shape is plastically deformed and formed by plastic working. By plastic working in this manner, the joint portion 32 is formed into a side surface shape as shown in FIG. fo1. The deformed relief hole 34 is formed in the shape of a long slit extending in the longitudinal direction along the center line 2 of the joint portion 32, as clearly shown in the diagrams (A), (B), and (B). It is preferable that the deformation escape hole 34 be formed in advance before the plastic working of the joint portion 32, but it may be formed after the plastic working. In this example, the escape hole 34 is provided only at the upper end of the joint, but it may be provided at both the upper and lower ends, or only at the lower end, if necessary. Furthermore, the shape is not limited to the long hole slit shape as in this example,
It can be formed into various other shapes.

Next, the reason for providing the deformed escape hole 34 will be explained. When the joint 32 is press-fitted into the through hole (in the U-shaped cross section shown in Figure 4, the left and right side walls 32b and 32c are pressed inwardly as shown by arrows a and b. The outside of the wall portion 32a is pulled in the lateral direction, and in a direction perpendicular to this pulling force, that is, in the longitudinal direction, a compressive force acts as shown by arrow C in the figure due to the action of this lateral pulling force. The inner side of the bottom wall portion 32a is compressed in the lateral direction, contrary to the case of the outer side, and a tensile force is exerted in a direction perpendicular to this compressive force, that is, in the longitudinal direction, due to the action of this lateral compressive force. ～Acts as shown by arrow d in the figure. Therefore, &～ As shown in the figure, due to the combined action of longitudinal compressive force (arrow C) and tensile force (arrow d),
The joint portion 32 is warped outward in the longitudinal direction of the bottom wall portion 32a having a U-shaped cross section. Therefore, the above compressive force (
By providing a means (releasing means) for absorbing the arrow C) and the tensile force (arrow d), it is possible to prevent the joint portion 32 from warping and deforming. In the present invention, a deformed relief hole 34 is provided as this absorption means. In other words, to express it in an extreme way,
When press-fitting the joint 32, the escape hole 3 shown in Figure 9
The outer end 34a of the escape hole 34 is recessed outward in the longitudinal direction of the escape hole 34, and the inner end 34b protrudes inward in the longitudinal direction of the escape hole 34, thereby absorbing the above compressive force (arrow C) and tensile force (arrow d). ) and can be absorbed. As a result, it is possible to prevent the connector pin 30 from warping and deforming when press-fitting into the through hole. Also, in this example, as mentioned above,
(The left and right side walls 3 of the U-shaped cross section of the joint 32 shown in Figure 4)
By forming the walls 2b and 32c thicker than the bottom wall 32a, consideration is given to minimizing the amount of warp deformation described above.

Note that the present invention is not limited to the above embodiments (
The gist of the present invention can be applied to all press-fit type connector pins in which the cross-sectional shape of the joint portion is formed into a C-shape, a 7-shape, etc., and where warping deformation occurs.

〔Effect of the invention〕

As explained above, according to the present invention, by providing the deformation escape hole in the joint portion as described above, warping and deformation is prevented when the press-fit type connector pin is press-fitted, and the press-fit is perpendicular to the board surface of the printed board. A remarkable effect is obtained in that the connector pins can be joined without bending or damaging the contact portions, and the press-fitting process can be automated using an automatic press-fitting machine.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the main parts of the embodiment of the present invention, Fig. 2 is a general side view of the embodiment of the invention, Fig. 3 is a diagram showing the main parts of the first conventional example, and Fig. 4 is a diagram of the second conventional example. FIG. 5 is a diagram showing the main parts of the third conventional example. FIG. 6 is a diagram explaining the problems of the conventional example. FIG. 7 is a diagram showing an example of the use of a press-fit connector bin. FIG. 8 is a cross-sectional view of GI GtltlA in FIG. 7. In Figures 1 and 2, 30 is an embodiment of the present invention (press-fit type connector bin), 31 is a contact portion, 32 is a joint portion (press-fit portion), 32a is a bottom wall portion of the joint portion, 32b and 32c are the joint portions. The left and right side walls, 34, are deformed relief holes, respectively.

Claims (1)

[Scope of Claims] 1. A press-fit connector pin that is press-fitted into a through-hole of a printed circuit board, and in which a joint portion that makes contact with the through-hole is formed in a continuous cross section such as a C-shape, a U-shape, or a V-shape, A press-fit type connector pin characterized in that a deformation escape hole (34) for preventing warp deformation is provided in at least one of both longitudinal ends of the joint part (32).