JPH0594977U - Connector pin - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the solder connection part of a connector pin from being destroyed by thermal fatigue and to extend the life of the connector pin. [Structure] In a connector pin in which a contact portion 2 for a socket contact of a mating connector and a wiring board mounting portion 3 are integrally configured, the wiring board mounting portion 3 has a plurality of legs 4 branched from the contact portion 2. , 5 are included. Moreover, the cross-sectional area of these limbs 4 and 5 was set smaller than the cross-sectional area of the contact part 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connector used by soldering to a wiring board, and more particularly to a connector pin that can withstand even if the operating environment temperature of a device in which the connector is mounted repeatedly changes greatly.

[0002]

[Prior Art]

 The connector pin of the conventional connector has a prismatic shape as a whole. FIG. 5 (a) is a perspective view showing an example of a conventional connector pin, and FIG. 5 (b) is a side view of the connector pin of FIG. 5 (a). As shown in FIGS. 5A and 5B, a conventional connector pin 23 is integrally formed of a contact portion side 24 having a prismatic shape with both ends formed in a truncated pyramid shape and a mounting portion 25. The aspect ratio of the cross-section (AA ') shape of the contact portion side 24 of the connector pin 23 and the aspect ratio of the cross-section (BB') shape of the mounting portion 25 on the wiring board, which is the foot portion, are almost the same (w. = T) is set.

FIG. 6A is a perspective view showing a connector using the connector pins 23 of FIGS. 5A and 5B, and FIG. 6B is a usage example of the connector of FIG. 6A. FIG. As shown in FIG. 6A, the connector pin 23 is housed and held through the bottom of a box-shaped housing 26 having an open upper end to form a connector. As shown in FIG. 6B, in order to mount this connector on the board, the mounting portion 25 of the connector pin 23 is penetrated through the through hole 29 of the wiring board 10 from the front surface, and the end of the connector pin 23 protruding to the rear surface. The part was soldered to the wiring board 10. In addition, fixed legs 26a having the same height are provided at the four corners of the bottom of the housing 26.

[0004]

[Problems to be solved by the device]

 By the way, in the conventional connector pin 23 as described above, since it is used in a prismatic shape as it is, in the case where the operating environment temperature of the mounted device is repeatedly changed greatly, As shown in the front sectional view, a relative displacement occurs between the housing 26 and the wiring board 10 due to a difference in thermal expansion coefficient between the housing 26 and the wiring board 10, as indicated by a broken line. Then, the connector pin 23 held in the housing 26 is displaced, and stress is repeatedly applied to the solder 11 connection portion, and as shown in the partially enlarged cross-sectional view of FIG. 7B, the solder 11 connection portion is cracked from the board side. No. 27, and eventually the solder 11 connection part broke, leading to thermal fatigue failure. In FIG. 7B, 28 is a circuit pattern, and 29 is a through hole for attaching a connector pin.

Therefore, a technical problem of the present invention is to provide a connector pin that can prolong the life of the solder connection portion due to thermal fatigue.

[0006]

[Means for Solving the Problems]

 The connector pin of the present invention is a connector pin composed of a wiring board mounting portion and a contact portion, and the wiring board mounting portion is composed of a plurality of limbs (hereinafter referred to as “division limbs”) branched from the contact portion. And the cross-sectional area of each of the plurality of limbs is set to be smaller than the cross-sectional area of the contact portion.

[0007]

[Action]

 In the present invention, since the cross-sectional area of each limb of the wiring board mounting part is set smaller than the cross-sectional area of the contact part, the bending rigidity is increased when a force that displaces these limbs is applied. It is reduced and easily deformed. For this reason, the stress applied to the limbs is divided, and the stress applied to the solder joint is also reduced, and the thermal fatigue life can be extended.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment FIG. 1 (a) is a perspective view showing a connector pin according to a first embodiment of the present invention, and FIG. 1 (b) is a side view of the connector pin of FIG. 1 (a). A cross-sectional view of each part is also shown in the figure. As shown in FIGS. 1 (a) and 1 (b), a connector pin 1 according to a first embodiment of the present invention has a prismatic shape having a contact portion 2 having a truncated pyramidal tip, and a contact portion 2 A slit 8 is formed so as to extend from a substantially middle portion near the lower end of the connector to the lower end, and the split portion 4 and 7 are formed by being divided into two in the thickness direction of the connector pin 1. One of the limbs 4 is on the extension line of the contact portion 2, and the other limb 5 is bent at a first bending point 6 at a right angle from the contact portion 4 and from the first bending point 6. It is further bent at a second bending point 7 at a predetermined size so as to be parallel to the one leg 4. These limbs 4 and 5 form a mounting portion 3 which is a foot to be attached to a wiring board (not shown). In addition, the thickness t ′ of the cross-sections (BB ′, CC ′) of the limbs 4 and 5 of the connector pin 1 is equal to the thickness t of the cross-section (AA ′) of the contact portion 2. It is about half.

FIG. 2A is a perspective view showing a connector having the connector pins of FIGS. 1A and 1B, and FIG. 2B is a usage example of the connector of FIG. 2A. It is sectional drawing shown. As shown in FIGS. 2 (a) and 2 (b), the connector accommodates and holds the connector pin 1 in the housing 9 at regular intervals, and the lower ends of the limbs 4 and 5 which are mounting parts are mounted on the board 10 through the substrate 10. It is inserted into the hole 29 and fixed with the solder 11. In this case, when a force acts on the connector pin 1 in a direction perpendicular to the paper surface, the mounting portion 3 is divided into two limbs 4 and 5, so that the force applied to the connector pin 1 is also divided. It is divided, the bending rigidity is weaker than that of the conventional mounting part that is the foot of the connector pin, and it is easy to deform, and the stress applied to the solder joint is also reduced accordingly. In addition, leg portions 9a having the same height are provided at the four corners of the bottom of the housing 9.

As described above, in the first embodiment, the bending angle of the other limb 5 is 90 degrees, but the bending angle is not limited to this and may be any angle. Further, although two bending points are provided, the bending angle of the first bending point 6 may be formed as an obtuse angle, and the first bending point 6 may be obliquely formed with one bending point.

Second Embodiment FIG. 3A is a perspective view showing a connector pin according to a second embodiment of the present invention, and FIG. 3B is a side view of the connector pin of FIG. 3A. A cross-sectional view of each part is also shown. As shown in FIGS. 3 (a) and 3 (b), in the first embodiment, the first limb 4 is formed on the extension line of the contact portion 2, but in the second embodiment, The limbs 15 and 16 forming the mounting portion 14 of the connector pin 12 are both formed so as to be separated from and parallel to the virtual extension line of the contact portion 13.

FIG. 4A is a perspective view showing a connector using the connector pins of FIGS. 3A and 3B, and FIG. 4B is a usage example of the connector of FIG. 4A. It is sectional drawing shown. As shown in FIGS. 4A and 4B, the connector pins 12 are housed and held in the housing 22 at regular intervals, and the lower ends of the respective limbs 15, 16 which are the mounting portions of the connector pins 12 are attached to the substrate 10. Inserted into the through hole 29 and fixed with the solder 11. In this case, even when a force is applied to the connector pin 12 in the direction perpendicular to the plane of the drawing, the mounting portion is divided into two limbs 15 and 16, and therefore, like the first embodiment, The flexural rigidity of the mounting part is weakened and the mounting part is easily deformed, and the stress applied to the solder joint is also reduced. Although the bending angle of each of the limbs 15 and 16 is set to 90 degrees in the second embodiment, the bending angle can be set arbitrarily in the second embodiment. Also in the second embodiment, it goes without saying that the connector pin 12 may be formed so that the bending point is at one place and the overall shape of the connector pin 12 is an inverted Y shape. 4A and 4B in the second embodiment are illustrated as having the contact portions arranged in a line, but in FIGS. 2A and 2B of the first embodiment, It may be arranged in two rows like the one shown. In this case, the horizontal part 15a of the first limb 15 and the horizontal part 16a of the second limb 16 may have different lengths, and they may be alternately arranged in opposite directions. It should be noted that leg portions 22a having the same height are provided at the four corners of the connector housing.

In the above-mentioned first and second embodiments, the limb is divided into two, but the present invention is not limited to this, and the limbs may be three or more. Not too long. Further, although the thickness t ′ of each of the limbs is equally divided, it is not limited to this, and it goes without saying that the thicknesses of the left and right limbs may be set differently. Nor.

[0015]

[Effect of the device]

 As described above, according to the present invention, the part of the connector pin to be mounted on the wiring board is divided into a plurality of limbs, and the cross-sectional area of each limb is set to be smaller than the cross-sectional area of the contact part. Therefore, the bending rigidity of the limb is reduced. Therefore, even if the operating environment temperature of the device changes repeatedly and the connector pins held in the housing are repeatedly displaced due to the difference in the thermal expansion coefficient between the housing and the wiring board, stress on the solder joint is reduced. Can be reduced. As a result, the life of the solder joint due to thermal fatigue can be extended, and a reliable connector can be obtained.

[Brief description of drawings]

FIG. 1A is a perspective view showing a connector pin according to a first embodiment of the present invention. (B) is a side view of the connector pin of (a) and a sectional view of a predetermined portion.

FIG. 2 is a perspective view showing a connector using the connector pins of FIGS. 1 (a) and 1 (b). (B) is sectional drawing which shows one usage example of the connector of (a).

FIG. 3A is a perspective view showing a connector pin according to a second embodiment of the present invention. (B) is a side view of the connector pin of (a) and a sectional view of a predetermined portion.

FIG. 4 is a perspective view showing a connector using the connector pins of FIGS. 3 (a) and 3 (b). (B) is sectional drawing which shows one usage example of the connector of (a).

FIG. 5A is a perspective view showing an example of a conventional connector pin. (B) is a side view of the connector pin of (a) and a sectional view of a predetermined portion.

FIG. 6 is a perspective view showing a connector using the connector pins of FIGS. 5 (a) and 5 (b). (B) is sectional drawing which shows one usage example of the connector of (a).

FIG. 7 is an explanatory diagram of a defect of a conventional connector pin,
(A) is a front sectional view in a state where a conventional connector pin is mounted on a wiring board, and (b) is a partially enlarged view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connector pin (1st Example) 2 Contact part 3 Mounting part 4 1st leg (mounting part) 5 2nd leg (mounting part) 9 Housing 10 Wiring board 11 Solder 12 Connector pin (2nd Example) ) 13 contact part 15 first limb 16 second limb 22 housing 23 connector pin (conventional example) 24 contact part 25 mounting part 26 housing 29 through hole

Claims (3)

[Scope of utility model registration request] 1. A connector pin in which a wiring board mounting portion and a contact portion are integrally formed, wherein the wiring board mounting portion is composed of a plurality of leg parts branched from the contact portion, and The connector pin, wherein the cross-sectional area of each of the plurality of limbs is set to be smaller than the cross-sectional area of the contact portion. 2. The connector pin according to claim 1, wherein the number of the limbs is two. 3. The connector pin according to claim 1, wherein the limbs have the same cross-sectional area.