JPS60230372A - Plug-in terminal - 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 (a) Technical Field of the Invention The present invention relates to a drive terminal that is press-fitted into a through hole of a printed circuit board and electrically connected and fixed without soldering.

(b) Background of the technology Traditionally, drive terminals for inputting and outputting external signals to circuits formed on printed circuit boards have not been able to provide sufficient electrical connection and fixing strength just by being driven in, so they must be soldered after being implanted. Dipping was commonly used. but,
Although this method provides sufficient electrical connection and fixing strength, it requires a soldering process and the number of man-hours involved.

Therefore, a drive terminal that does not require soldering appeared,
came into use.

CC,) Prior art and problems Figure 1 is a perspective view showing a first plug-in terminal with a conventional configuration (
A), its enlarged cross-sectional view in the direction of arrow A (II), its enlarged cross-sectional view in the direction of arrow B (c), and FIG. It is an enlarged sectional view (b).

In FIG. 1, a drive terminal 1 is made of a conductive material having spring properties such as phosphor bronze, and has contact portions 2 at both ends.
It is constructed by integrally forming a locking part 5 and a joining part 6 in the middle part of a pin-shaped main body 4 having a wire ramp part 3. The joint portion 6 connects the pair of pressure-welding portions 7 to the connecting portion 8.
The connecting portion 8 is elastically connected to the opposing recesses 9 and 1.
0, it is formed thinner than the pressure contact portion 7.

In FIG. 2, the implant terminal 11 is made of a conductive material with spring properties such as phosphor bronze, and has contact portions 1 at both ends.
2. A locking part 15 and a joining part 16 are integrally formed in the middle part of a pin-shaped main body 14 having a wire ramp part 13. The joint portion 16 is formed by elastically connecting a pair of pressure contact portions 17 with a connecting portion 18 .

In the drive terminal configured in this way, the joining part is press-fitted into the through hole of the printed circuit board, and the locking part is brought into contact with the top surface of the printed circuit board. It is desirable that the terminal be press-fitted without cutting, and that the pressing force be small and the removal force (terminal holding force) be large.

However, when a conventional drive-in terminal is press-fitted into a through-hole, there is a partial gap between the end surface 21 of the press-contact part and the inner surface of the through-hole 22, as shown in cross-sectional views of two examples in FIG. 23.24 or a partial cut 25 occurs in the through hole 22 at the corner of the pressure welding part, etc.
The removal force when press-fitting a terminal with a press-in force of kg is 5 to 6.
kg, and improvements have been desired.

(d) Object of the Invention The object of the present invention is to provide a driving terminal in which the above-mentioned problems are improved, based on the results of studies on the shape of the connecting portion of the driving terminal when it is press-fitted into a through hole and the state in which it is press-fitted. That's true.

(e) Structure of the Invention The above object is to provide a locking part in the middle part of the pin-shaped body made of a conductive material, which acts as a stopper of the pin-shaped body when driving into the through-hole, and to provide an elastic force to the inner surface of the through-hole. This is achieved by a drive terminal characterized in that a joint part that presses into contact with the through hole is integrally formed, and a recess is formed between the joint part and the locking part to escape contact with the inner surface of the through hole. .

(f) Examples of the invention The present invention will be explained in detail below using the drawings.

FIG. 4 is a plan view (A) of a drive terminal according to an embodiment of the present invention, a cross-sectional view (U) of the drive terminal, and a cross-sectional view (C) of the drive terminal as seen from the arrow E. FIG. Cross-sectional views for sequentially explaining the process of press-fitting into a printed board, FIG. 6 is a press-fitting line diagram during the press-fitting, and FIG. 7 is a cross-sectional view of the terminal joining part where the drive-in terminal is press-fitted into the through hole. It is.

In FIG. 4, the implant terminal 31 is made of a conductive material with spring properties such as phosphor bronze, and has contact portions 3 at both ends.
2. A locking part 35 and a joint part 36 are integrally formed in the middle part of a pin-shaped main body 34 having a wire wrap part 33, and the joint part 36 has a pair of press-contact parts 37 connected to a joint part 38 having an arc-shaped cross section. Elastically bonded.

Note that the joining portion 36 and the connecting portion 38 are approximately oval in plan view, and due to the oval shape, the joining portion 3G and the locking portion 35 form a recess 43 for escaping contact with the inner wall of the through hole.
is formed. On the other hand, the connecting portion 38 is shown in FIG. 4(0) (
As shown in +1), it is composed of concave portions 39 and 40, and has an arcuate cross section.

FIG. 5 is a diagram showing the process of press-fitting the drive-in terminal 31 into the through hole. In FIG. Displacement (stroke) after contact, vertical axis is press force,
The solid line P is the driving terminal pressure input characteristic.

5 and 6, the terminal 31 is inserted into the through hole 42 of the printed board 41 from the tip of the wire wrap portion 33.
When inserted, the tip shoulder 36a of the joint portion 36 comes into contact with the through hole 42 as shown in FIG. corresponding and gradually increasing. Therefore, when the insertion is continued further, the joining portion 36 is shown in FIG.
When the straight part of almost the entire length comes into contact with the through hole 42, the displacement 61 in FIG.
As shown in p2, the increase in the characteristic P decreases and a nearly flat portion is formed.

Next, when the insertion is further continued, the rear shoulder portion 3fib of the joining portion 36 comes into contact with the through hole 42 as shown in FIG. The pressing force in the area where the pressing force hits and stops corresponds to the characteristic P in the displacement area p3 in FIG. 6, and after gradually increasing, becomes almost flat (or tends to decrease slightly) and stops.

In this characteristic P, the flat portion (or the reduction of the pressing force) in the displacement region p3 is achieved by forming the joint portion 36 of the driving terminal 31 into an approximately oval shape in plan view, that is, by forming the connecting portion 36 of the driving terminal 31 into an approximately oval shape in a plan view.
The conventional drive terminal shown in FIGS. 1 and 2 has a width that is wider than that of the pin-shaped body at the connecting part. Because the pressure force corresponding to the displacement region p3 is connected to the locking portion, the pressure force corresponding to the displacement region p3 increases following the pressure increase characteristic of the frontal region p2.

Therefore, as shown in FIG. 9, the taper α1 at both ends of the joint portion 36 is set to approximately 15 degrees, and the taper α2 at both ends of the connecting portion 38 is set to approximately 15 degrees.
The drive terminal 31 is inserted at about 20 degrees, and the rising angle α of the longitudinal end of the connecting portion 3B is set at about 50 degrees as shown in FIG. 4(c). The removal force when press-fitting into the through hole 42 is 7 kg or more,
The removal force (holding force) was able to be increased by 15% or more compared to a conventional drive-in terminal that was press-fitted with the same pressure.

On the other hand, the joint portion 36 press-fitted into the through hole 42 is
As shown in FIG. 7, the entire outer end surface of the joint portion 36 (press contact portion 37) is pressed against the inner wall of the through hole 42. As shown in FIG. However, such a pressure-welded state
How the pair of press-contact parts 37 integrated via 8 behave in the through-hole 42, that is, how the pair of press-contact parts 37 behave relative to each other in the through-hole 42 as well as the plastic deformation strength of the connecting part 38 How it is displaced has a big influence.

Therefore, the present inventors determined that the cross-sectional dimensions of the joint portion 36 are as shown in FIG. The connecting portion 3B may be plastically deformed so that the illustrated lower corner 37a of No. 37 slides along the inner wall of the through hole, and the illustrated upper corner 37b approaches the opposite direction (inward). We focused on this and considered it.

As a result, in FIG.
) to approximately 173, and by making the deviation δ between the widthwise center of the connecting portion 36 and the thickness center line of the pressure contact portion 37 to at least 17IO of the pressure contact portion thickness to). The deformation accompanied by the above-mentioned sliding is realized, and furthermore, each cross-sectional corner part is appropriately rounded (for example.

By adding R0,1), the insertion of the drive terminal can be done smoothly and without damaging the through hole.

(g) As described in detail, according to the present invention, the press-fitting of the drive terminal is facilitated and its holding force is increased, and the conductor layer of the through hole is not damaged during press-fitting, so that the drive terminal can be easily pressed into the drive terminal. The effect of improving the reliability of circuit connections is extremely large.

[Brief explanation of drawings]

Figure 1 is a diagram for explaining a first drive terminal with a conventional configuration, Figure 2 is a diagram for explaining a second drive terminal with a conventional configuration, and Figure 3 is a diagram for explaining a conventional configuration. 4 is a cross-sectional view illustrating a drive terminal in a press-fitted state, FIG. 4 is a diagram for explaining a drive terminal according to an embodiment of the present invention, and FIG. 5 is a diagram showing the drive terminal shown in FIG. 6 is a press-in force diagram when the drive-in terminal shown in FIG. 4 is press-fitted into the through-hole of the printed circuit board, and FIG. FIG. 8 is a cross-sectional view of the terminal joint portion where the terminal is press-fitted into the through hole, FIG. 8 is a diagram for explaining the main dimensions of the drive terminal joint portion shown in FIG. 4, and FIG.
FIG. 3 is a plan view of the drive terminal joining portion shown in the figure. In the figure, 1, 11.31 are drive terminals, 4.14.
34 is a pin-shaped pair, 5, 15.35 is a locking part, 6.16
．． 36 is the joint part, 7, 17.37 is the pressure welding part, 8.18
．． 38 is a connecting portion, 22, . 42 is a through hole, 43 is a recess that escapes contact with the inner wall of the through hole, α is a taper at both ends of the joint part, α2 is a taper at both ends of the connecting part,
α3 is the rising angle of the longitudinal end of the connecting part, to is the thickness of the pressure contact part, 1. is the thickness of the central part of the joint. Ivy 1 Fig. 6 70 Aquarium 2 Fig. (b) 8 Kuni 4 Fig. () Riaki S Fig. 6 Displacement - Calculation 7 Fig.

Claims (6)

[Claims] (1) In the middle part of the pin-shaped body made of conductive material,
A locking portion that serves as a stopper for the pin-shaped main body when driving into a through hole and a joint portion that elastically presses against the inner surface of the through hole are integrally formed, and there is a gap between the joint portion and the locking portion. A driving terminal characterized in that a recess is formed to escape contact with the inner surface of the through hole. (2) The joint portion is formed from at least two pressure contact portions protruding from both sides of the pin-shaped main body and a connecting portion that elastically connects the pressure contact portions, and the locking portion is formed from the joint portion. The drive terminal according to claim 1, wherein the drive terminal is formed at an upper position so as to protrude from both sides of the pin-shaped main body. (3) The outer shape of the joint portion is roughly oval in plan view, and the outer shape of both ends thereof is tapered at about 15 degrees with respect to the pin-shaped main body, so that the connecting portion is roughly oval in plan view. The driving terminal according to claim 1, characterized in that the drive terminal has the oval shape and the contours of both ends thereof are tapered at about 20 degrees with respect to the pin-shaped main body. . (4) The thickness tl) of the central part of the connecting part formed in an arc-shaped cross section in the width direction of the joint part is approximately 173 times the thickness to) of the pressure welding part, and Claim 1, characterized in that the center of the pressure contact part is biased to one side by 1710 degrees or more of the pressure contact part thickness (to) from the center line in the pressure contact part thickness (to) direction. The described drive terminal. (5) A cross section in the longitudinal direction of the connecting portion is in the shape of a ship bottom;
The driving terminal according to claim 1, wherein both ends thereof are tapered at approximately 50 degrees with respect to the pin-shaped main body. (6) The drive terminal according to claim 1, wherein the cross-sectional corner portion of the press-contact portion is rounded.