JPH05290915A - Connector for circuit substrate - Google Patents

Abstract

PURPOSE:To provide the connector for circuit substrate, in which the stress is hard to be generated in the solder even in the case where the surrounding temperature is changed and the residual stress due to a difference of the thermal contraction between a circuit substrate and a connector with the solidification of the solder is reduced and crack of the solder and peeling of the circuit pattern can be prevented. CONSTITUTION:Plural connector pins 1 arranged in a line to a connector main body 2 are inserted to circuit pattern holes of a circuit substrate, and thereafter, they are soldered to be electrically connected to the circuit substrate. At this stage, a connector main body 2 is provided with plural holding parts 2a for holding plural connector pins 1 separately and plural beam parts 2b, which are arranged between the plural holding parts 2a and deformed easily in the arrangement direction of the connector pins 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit board connector mounted on a printed circuit board.

[0002]

2. Description of the Related Art Conventionally, a circuit board connector mounted on a printed circuit board has been known. In this type of connector, a plurality of connector pins are provided on the printed circuit board to form a male connector portion, while at the same time electrical continuity is secured to the male connector portion and a female connector portion for preventing disconnection is provided. It is a unit. Typical types of this circuit board connector are a straight type in which connector pins are provided substantially vertically to the board mounting surface, and an edge type in which connector pins are bent at a right angle from the middle and are provided substantially parallel to the board mounting surface. Is.

A straight type conventional circuit board connector will be briefly described with reference to the drawings.
FIG. 9 is a front view of a conventional circuit board connector. In this figure, the circuit board connector is made up of a connector male part 20 and a connector female part 21 as a unit, and a single wire 23 or a flat cable (not shown) is connected to the connector female part 21 in a broken line illustration. Of the connector terminal 24, the elastic portion of the connector terminal 24 is elastically deformed when it is inserted into the connector pin 9, and the contact force is generated, whereby electrical continuity between the connector terminal 24 and the connector pin 9 is achieved. The various formats have been put into practical use.

Further, the connector male portion 20 is provided with a block body 22 made of a resin material in order to provide all the connector pins 9 on the mounting surface of the circuit board 7 in a substantially vertical state.
Are integrally molded or press-fitted in advance, the end portions 9a of the connector pins 9 are inserted into the land hole portions of the circuit pattern on the surface of the circuit board 7, and then passed through a soldering device or the like to solder 8 at a time. The so-called soldering is performed by forming the.

The connector male portion 2 thus provided
The connector female portion 21 is directly press-fitted into 0 to be used as a connector.

[0006]

However, since the circuit board 7 is exposed to the conditions of a wide temperature range (for example, -10 ° C to + 85 ° C) in the actual use condition, the conventional connector described above is used. Is a block body 22 that constitutes the male connector section 20 due to a change in ambient temperature.
However, it expands and contracts in the longitudinal direction, which causes a phenomenon that the pitch interval of the connector pins 9 deviates from the pitch interval of the land hole portions on the circuit board 7. Actually, the circuit board 7 also expands and contracts in the same direction as the block body 22, so the magnitude of the deviation is alleviated. Generally, the material forming the block body 22 and the circuit board 7 are formed. Since the coefficient of thermal expansion differs from that of the material, the pitch interval between the connector pins 9 and the pitch interval between the land hole portions of the circuit board 7 will always be different.

This discrepancy in the pitch intervals causes stress in the solder 8. Furthermore, when soldering the connector pins 9 to the circuit board 7, a difference in thermal contraction occurs between the block body 22 and the circuit board 7 as the solder 8 solidifies.
This thermal contraction difference also causes residual stress in the solder 8. Such stress generated in the solder 8 causes solder cracks or peeling of the circuit pattern as shown in FIG. The occurrence of solder cracks and peeling of the circuit pattern in this way causes disconnection of the signal lines of the electric circuit, which causes a failure or the like.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to prevent stress from being generated in the solder even when the ambient temperature changes and to cause a circuit accompanying solidification of the solder. It is an object of the present invention to provide a circuit board connector capable of reducing residual stress due to a difference in thermal contraction between the board and the connector and preventing solder cracks and peeling of a circuit pattern.

[0009]

In order to solve the above-mentioned problems and to achieve the object, a circuit board connector of the present invention comprises:
In a connector for a circuit board electrically connected to the circuit board by soldering after inserting a plurality of connector pins arranged in a row with respect to the connector body into a circuit pattern hole of the circuit board, The connector body is
A plurality of holding portions that independently hold each of the plurality of connector pins, and are arranged between each of the plurality of holding portions,
And a low-rigidity portion which is easily deformed in the arrangement direction of the connector pins.

Further, in the circuit board connector according to the present invention, the low-rigidity portion is formed integrally with the plurality of holding portions. Further, in the circuit board connector according to the present invention, the low-rigidity portion is formed in a beam shape having a cross-sectional area smaller than that of the holding portion.

[0011]

As described above, since the circuit board connector according to the present invention is constructed, the residual rigidity of soldering can be reduced by expanding and contracting the low-rigidity portion between the holding portions. Even when the surrounding temperature changes and a difference in thermal expansion occurs between the connector body and the circuit board, the stress generated in the solder portion can be reduced, preventing solder cracks and circuit pattern peeling. can do.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The circuit board connector described in the following embodiments is of the straight type already described, and only the structure of its male part will be described. (First Embodiment) FIG. 1 is an external perspective view showing the structure of a male portion 10 of a circuit board connector of the first embodiment, and FIG. 2 is a side sectional view of FIG.

First, referring to FIG. 1, the male portion 10 of the circuit board connector is composed of a connector body 2 and a plurality of connector pins 1. In a connector body 2 made of a resin material or the like, a plurality of connector pins 1 are arranged in an upright state at regular pitch intervals along the longitudinal direction. The connector pin 1 is formed integrally with the connector body 2 by insert injection molding when the connector body 2 is molded, or is attached to the connector body 2 later by a method such as press fitting. .. Further, the connector pin 1 is made by processing a material such as copper into a prismatic shape, and has a surface plated with gold or the like. By making the connector pin 1 into a prismatic shape, it is possible to secure an area for receiving the abutting force of the connector terminal arranged in the female portion of the connector, and also to prevent the connector pin from coming off after insert molding or press fitting. ..

On the other hand, the connector body 2 is, as shown in the figure,
Block-shaped holding portion 2 for holding the connector pin 1
a and a beam portion 2b (low rigidity portion) having a small cross-sectional area, which is located between the holding portions 2a. When the male portion 10 of the circuit board connector thus configured is soldered to the circuit board, the beam contraction difference between the circuit board and the connector body 2 due to the solidification of the solder is absorbed by the beam portion 2b. Therefore, the connector pin 1 is not tilted, and cracking of the solder is prevented. Further, even if a difference in thermal expansion occurs between the circuit board and the connector body 2 due to a change in the ambient temperature in the actual use state after the completion of soldering, the difference in expansion is absorbed by the beam portion 2b. Similarly, cracking of the solder is prevented. Furthermore, even if the number of connector pins 1 is large, it is not necessary to separate the connector body 2.

The function of the beam portion 2b to absorb the difference in thermal contraction (or difference in thermal expansion) between the circuit board and the connector body 2 is as follows.
With the same material, the smaller the cross-sectional area, the larger the load per unit area when subjected to the same compressive load or tensile load, and the dimensional change (shrinkage, crushing, elongation, etc.)
Is based on the principle that Therefore,
The degree of absorption of the difference in thermal contraction (difference in thermal expansion) between the circuit board and the connector body 2 varies depending on the length and cross-sectional area of the beam 2b. (Second Embodiment) FIG. 3 is an external perspective view showing the structure of the male portion 12 of the circuit board connector of the second embodiment, and FIG. 4 is a side sectional view of FIG.

In the second embodiment, the beam portion 2b of the first embodiment is arranged above and below the holding portion 2a.
It is replaced with c. Since other parts are the same as those in the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted. In this second embodiment as well, since the difference in thermal contraction (difference in thermal expansion) between the circuit board and the connector body 2 can be absorbed by the beam portion 2c, solder cracks are generated in exactly the same way as in the first embodiment. Can be prevented. Further, even if the number of connector pins 1 is large, it is not necessary to separate the connector body 2. (Third Embodiment) FIG. 5 is an external perspective view showing the structure of the male portion 14 of the circuit board connector of the third embodiment, and FIG. 6 is a side sectional view of FIG.

In the third embodiment, the beam portions 2b in the first embodiment are replaced by beam portions 2d arranged on the left and right sides of the holding portion 2a. Since other parts are the same as those in the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted. Also in this third embodiment,
Since the difference in thermal contraction (difference in thermal expansion) between the circuit board and the connector body 2 can be absorbed by the beam portion 2d, it is possible to prevent the occurrence of solder cracks, just as in the first embodiment.
Further, even if the number of connector pins 1 is large, it is not necessary to separate the connector body 2. (Fourth Embodiment) FIG. 7A is a view showing a state in which the male portion 16 of the circuit board connector of the fourth embodiment is attached to the circuit board 3, and FIG. 7B is a circuit board. 7 is a plan view of FIG.

In the fourth embodiment, the beam portion 2b in the first embodiment is replaced with a beam portion 2e formed in a loop shape with respect to the holding portion 2a. The other parts are
Since it is the same as the first embodiment, the same parts are designated by the same reference numerals and the description thereof is omitted. Further, FIG. 8 shows a female portion 1 corresponding to the male portion 16 of the circuit board connector of the fourth embodiment.
8 shows the structure of No. 8. This female part 18 is also the male part 1.
It is formed in the same structure as that of No. 6, and the pitch interval on the female side can also be changed in accordance with the change in pitch interval of the connector pin 1.

As described above, according to the circuit board connector of the above-mentioned embodiment, the conduction failure due to the generation of the solder crack is not caused, and the connector body is separated even when the number of the connector pins is large. There is no need to do it.
The present invention can be applied to the modified or modified embodiment described above without departing from the spirit of the invention.

[0020]

As described above, according to the connector for a circuit board of the present invention, the low-rigidity portion between the holding portions expands and contracts, so that the residual stress of soldering can be reduced. At the same time, even if the ambient temperature changes and a difference in thermal expansion occurs between the connector body and the circuit board, the stress generated in the solder portion can be reduced, so solder cracks and circuit pattern peeling can be prevented. be able to.

[Brief description of drawings]

FIG. 1 is an external perspective view showing the structure of a male part of a circuit board connector according to a first embodiment.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is an external perspective view showing the structure of a male portion of the circuit board connector of the second embodiment.

FIG. 4 is a side sectional view of FIG.

FIG. 5 is an external perspective view showing the structure of the male part of the circuit board connector of the third embodiment.

FIG. 6 is a side sectional view of FIG.

FIG. 7 is a diagram showing a state in which a male part of a circuit board connector of a fourth embodiment is attached to a circuit board, and a plan view of the circuit board.

FIG. 8 is a diagram showing the structure of a female portion corresponding to the male portion of the circuit board connector of the fourth embodiment.

FIG. 9 is a front view of a conventional circuit board connector.

FIG. 10 is a diagram showing how solder cracks occur.

[Explanation of symbols]

 1 Connector Pin 2 Connector Body 3 Circuit Board 10, 12, 14, 16 Male Part of Circuit Board Connector 18 Female Part of Circuit Board Connector

Claims (3)

[Claims] 1. A circuit electrically connected to the circuit board by inserting a plurality of connector pins arranged in a row with respect to the connector body into a circuit pattern hole of the circuit board and then soldering the connector pins. In the board connector, the connector body is arranged between a plurality of holding portions that individually hold the plurality of connector pins and each of the plurality of holding portions, and is arranged in the arrangement direction of the connector pins. A circuit board connector comprising a low-rigidity portion that is easily deformed. 2. The circuit board connector according to claim 1, wherein the low-rigidity portion is integrally formed with the plurality of holding portions. 3. The circuit board connector according to claim 2, wherein the low-rigidity portion is formed in a beam shape having a cross-sectional area smaller than a cross-sectional area of the holding portion.