JPH08298388A - Surface mounting electric device - Google Patents

Abstract

PURPOSE: To mount an electric device on a wiring board while ensuring a prede termined function without causing any inclination or floating of the device body by preventing the defective contact due to flux flowing along a terminal to the device body side at soldering. CONSTITUTION: A socket body 1 for relay having a plurality of projecting terminals 2 is provided with a plurality of stand-off parts 3, while abutting against the surface of a wiring board 4, in order to define a space between them 1, 4. A pawl being stopped at the circumferential fringe of a hole on the rear side of the wiring board 4 is projecting downward from the lower side of each stand-off part 3. A protrusion 5 deformable while resisting against the resiliency is extended such that the stopper pawl can be inserted when a protrusion 5 is inserted into an insertion hole 7 made through the wiring board 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type electric device in which various kinds of electric devices such as relay sockets and relays are mounted on the surface of a wiring board such as a printed circuit board.

[0002]

2. Description of the Related Art In this type of surface mount type electric equipment, the terminals of the equipment body are inserted through holes formed in the wiring board so as to project to the back side of the wiring board, and then the terminals are soldered to the board. It is attached by attaching. If the flux used at the time of soldering flows through the terminals and flows into the main body of the device, there is a very high possibility of causing malfunction of the device such as poor contact.

As a countermeasure against this, conventionally, as shown in FIG. 7, a terminal 21 of an electric device body 20 is inserted through a hole 23 formed in a printed wiring board 22 so as to project to the back side of the printed wiring board 22. At this time, a standoff portion 25 is formed on the lower surface of the electric device body 20 so as to contact the surface of the printed wiring board 22 and form a space 24 between the electric device body 20 and the surface of the wiring board 22. A stand-off type was used.

[0004]

However, in the above-mentioned stand-off type surface mount type electric equipment, since the lower surface of the stand-off portion 25 is simply brought into contact with the surface of the wiring board 22, it is originally small in size. Since the contact area of the stand-off part 25 is very small due to its small mass, it is unstable with respect to slight vibrations and shocks during mounting,
There is a problem that the device body 20 easily tilts or rises with respect to the printed wiring board 22 and is soldered in this state, which adversely affects a predetermined function.

The present invention has been made in view of the above circumstances, and in addition to preventing contact failure due to flux flowing through the terminals and flowing into the main body of the device during soldering, the main body of the device is tilted or lifted. It is an object of the present invention to provide a surface mount type electric device that can be attached to a wiring board while ensuring a predetermined function without inviting.

[0006]

In order to achieve the above object, a surface mount type electric device according to the present invention is inserted through a hole formed in a wiring board so as to project to the back side of the wiring board. On the lower surface of the electric equipment main body having terminals, a plurality of spaces are formed between the electric equipment main body and the surface of the wiring board by contacting the surface of the wiring board when the terminals are inserted into the holes of the wiring board. In a surface-mounted electric device having a stand-off portion formed, a length that can be inserted into a hole formed in the wiring board from the lower side of each stand-off portion downward, and a tip portion is provided. When it is inserted into the hole, it can be flexibly deformed against elasticity so as to allow the insertion, and has a locking claw that is locked to the peripheral edge of the hole on the back surface side of the wiring board when the elastic return immediately after insertion. It has multiple protrusions. .

In the surface mount type electric device having the above structure,
By pushing each protrusion into the holes of the wiring board from above from the locking claws of the plurality of protrusions, the protrusions are automatically slidably contacted with the inner peripheral surface of the hole to permit the insertion of the locking claws. It is preferable to form a cam-like surface that flexibly deforms against elasticity, and a stand-off portion formed by extending the protruding piece with the locking claw is formed on the lower surface of the base of the electric device body. Good.

[0008]

According to the present invention, the terminal of the electric device body is inserted through the hole of the wiring board so as to project to the back surface side of the wiring board, and at the same time, the protrusion extending downward from the lower side of the standoff portion. By inserting the piece into the hole of the wiring board while flexibly deforming the locking claw at the tip end against the elasticity, when the terminal is projected to the back surface side of the wiring board for a predetermined length, The tip locking claw comes out of the hole and elastically returns, and the locking claw is locked to the peripheral edge of the hole on the back surface side of the wiring board. As a result, the wiring board is sandwiched from the front and back sides by the lower side of the stand-off part and the locking claws, and the electric device main body does not drop from the wiring board even when the front and back are reversed. It is attached. By soldering the terminals in this state, not only is flux prevented from flowing through the terminals into the electrical equipment body, but even if vibration or shock is applied, the electrical equipment body will not contact the wiring board. It does not tilt or float and can be installed while ensuring a predetermined function.

In particular, as described in claim 2, in the locking claw,
By pushing the protrusions into the holes of the wiring board from above, the protrusions are slidably contacted with the inner peripheral surface of the holes to allow the insertion of the locking claws. When the surface is formed, the tilting and tilting as described above can be performed by a simple work operation of simply pushing in from above without using a hand or a special tool when inserting the protrusion with the locking claw. It can be installed without floating, and the mounting workability can be improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional side view showing a mounting structure of a relay socket according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a relay socket main body having a rectangular shape in a plan view, and a rear surface side of the relay socket main body. A plurality of terminals 2 are provided in a protruding manner, and columnar standoff portions 3, 3 are formed so as to protrude downward at both corners in one diagonal direction,
Projecting pieces 5 and 5, which will be described later, are integrally extended downward from the lower surfaces of the standoff portions 3 and 3. Reference numeral 4 denotes a printed wiring board, and as shown in FIG. 2, terminal insertion holes 6 corresponding to the terminals 2 of the relay socket body 1 and insertion holes 7, 7 corresponding to the projecting pieces 5, 5 are formed. When the terminal 2 and the projecting pieces 5, 5 are inserted into the respective insertion holes 6, 7, 7 such that they project toward the back surface side of the printed wiring board 4, the standoff parts 3, 3 The lower surface is brought into contact with the surface of the printed wiring board 4 to form a space 8 between the relay socket body 1 and the surface of the printed wiring board 4.

As shown in FIG. 3, each of the projecting pieces 5 has
It has a length capable of penetrating the insertion hole 7 and can be deformed flexibly in a diameter-reducing manner against elasticity in the directions in which they approach each other due to the notch 8 formed across the axial center thereof. It is composed of a pair of projecting piece portions 5A, 5A which are divided into two parts, and when the pair of projecting piece portions 5A, 5A is inserted into the insertion hole 7, as shown in FIG. So as to be allowed to be elastically bent and deformed in a diameter-reduced direction in a direction in which they approach each other, and immediately after insertion, as shown in FIG. 3B, elastically returns to the back surface side of the printed wiring board 4. Locking claws 5B, 5B that are locked to the peripheral edge of the hole are formed. In addition, by pushing the projecting piece 5 into the insertion hole 7 from above, the locking claws 5B and 5B are slidably contacted with the inner peripheral surface of the insertion hole 7 so that the locking claws 5B and 5B can be inserted. Cam-shaped surfaces 5C, 5C are formed so as to allow the pair of projecting piece portions 5A, 5A to automatically bend and deform in a diameter-reducing manner against elasticity as shown in FIG. 3A.

Next, a mounting procedure of the relay socket configured as described above on the printed wiring board 4 will be described. After the relay socket body 1 is aligned such that the terminals 2 and the tips of the projecting pieces 5 and 5 are respectively aligned with the corresponding insertion holes 6 and 7 and 7 of the printed wiring board 4, the relay socket body 1 is mounted. When the downward pushing operation is performed, the terminal 2 is inserted into the insertion hole 6 and at the same time, each of the projecting pieces 5 and 5 has a pair of projecting piece portions 5.
The tip locking pawls 5B and 5B of A and 5A are cam-shaped surfaces 5C and 5
As shown in FIG. 3 (a), the sliding contact with C causes it to be inserted into the insertion hole 7 while being automatically flexed and deformed in a diameter-reducing direction in the direction of approaching each other against elasticity. Then, when the terminal 2 projects to the back surface side of the printed wiring board 4 by a predetermined length, the lower surfaces of the standoff portions 3 and 3 come into contact with the front surface of the printed wiring board 4 and the protrusions 5 and 5 are formed. Tip locking claws 5B and 5B of the pair of projecting pieces 5A and 5A
Comes out of the insertion hole 7 and elastically returns, and the locking claws 5B, 5
As shown in FIG. 3B, B is locked to the peripheral edge of the hole on the back surface side of the printed wiring board 4.

As a result, the printed wiring board 4 has the lower surfaces of the standoff portions 3 and 3 and the locking claws 5 of the protruding pieces 5 and 5.
With B and 5B, the relay socket body 1 is sandwiched from both sides, and the relay socket body 1 is attached in a fixed posture so as not to drop from the wiring board 4 even when the front and back are reversed. By soldering to the terminal 2 in this state, even if the flux flows through the terminal 2 to the surface side of the printed wiring board 4, the flux stops in the space 8 and flows into the relay socket body 1. Not only is it blocked, but even if vibration or shock acts, the wiring board 4
On the other hand, the relay socket body 1 does not tilt or float up, and soldering can be performed while maintaining a predetermined function.

FIG. 4 shows an example of application to a relay as another embodiment of the present invention, in which the protrusion 5 with the locking claw 5B is provided at the center in the width direction of the side plate 9a of the relay case 9 which is the main body of the electric equipment. The plate-like standoff portion 3 is integrally formed so as to project downward, and is extended downward from the lower side. Since other configurations are the same as those in the above-mentioned embodiment, the same reference numerals are given to the corresponding portions. And, those explanations are omitted. Even in the case of such a relay, the same work procedure as above is used, as shown in FIG.
As shown in, the relay case 9 can be mounted on the printed wiring board 4 in a predetermined manner.

FIG. 6 shows an example of application to a relay as another embodiment of the present invention, in which the projecting piece 5 with the locking claw 5B is covered with a relay case 9 to form a main body of electric equipment.
0 is formed by extending downward from the lower side of the plate-like standoff portion 3 integrally formed with the 0. Since other configurations are the same as those of the above-mentioned respective embodiments, the same reference numerals are given to corresponding portions. And their description is omitted.

In the embodiment described above, the pair of protrusions 5A, 5A of the protrusion 5 have a pair of protrusions 5A, 5A at their distal end retaining portions 5B, 5B so that the engaging claws 5B, 5B can be inserted through the holes. The description has been made by forming the cam-shaped surfaces 5C, 5C that automatically bend and deform the pieces 5A, 5A against elasticity, but without forming the cam-shaped surfaces 5C, 5C, At the time of insertion, it may be artificially bent and deformed by using a tool or the like. The present invention is not limited to relay sockets and relays, but may be applied to any electric equipment as long as it is mounted on the surface of the printed wiring board 4.

[0017]

As described above, according to the present invention, the standoff portion formed on the lower surface portion of the electric device body in order to form a space with the surface of the wiring board is directed downward from the lower side of the standoff portion. Since a plurality of protrusions having locking claws that are locked to the peripheral edge of the hole on the back surface side of the wiring board are extended at the tip of the wiring board, the terminals of the electrical equipment main body pass through the holes of the wiring board. In a predetermined mounting state in which a predetermined length is projected to the back surface side, the standoff portion forms a predetermined space, and
By sandwiching the wiring board from the front and back sides by the lower side of the standoff part and the locking claws, it is possible to hold the wiring board in a certain posture so that the electric equipment body does not drop from the wiring board even if the front and back are reversed. Thus, by soldering the terminals, flux can be prevented from flowing through the terminals and flowing into the electric equipment body, and even if vibration or shock acts, the electric equipment body may tilt with respect to the wiring board. Thus, there is an effect that the main body of the electric device can be surely and easily attached to the wiring board while keeping a predetermined function without floating.

In particular, when a cam-like surface is formed on the locking claw for automatically bending and deforming the projecting piece against elasticity, the projecting piece with the locking claw can be formed. Even if you do not use a hand or a special tool when inserting it, you can install it without tilting or lifting as described above by simply pushing it in from above, aiming to further improve the mounting workability. be able to.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing a mounting structure of a relay socket according to an embodiment of the present invention.

FIG. 2 is a hole layout diagram of a wiring board according to the embodiment.

FIG. 3 is an explanatory view of an enlarged function of a main part in the embodiment.

FIG. 4 is a perspective view of a relay that is another embodiment of the present invention.

5 is a partial cross-sectional side view showing the mounting structure of the relay of the embodiment shown in FIG.

FIG. 6 is a vertical sectional side view showing a relay mounting structure according to another embodiment of the present invention.

FIG. 7 is a partial cross-sectional side view showing a conventional electrical device mounting structure.

[Explanation of symbols]

 1 Relay socket body (an example of electrical equipment body) 2 Terminal 3 Standoff part 4 Printed wiring board 5 Projection piece 5A Projection piece part 5B Locking claw 5C Cam-shaped surface 6,7 Insertion hole 8 Space 9 Relay case (electrical) Example of device body) 10 base

Claims (3)

[Claims] 1. When the terminal is inserted through a hole formed in a wiring board into the lower surface of an electric device body having a terminal which is inserted so as to project to the back side of the wiring board. In a surface mount type electric device, which is formed by contacting the surface of the wiring board and forming a plurality of standoff parts for forming a space between the main body of the electric device and the surface of the wiring board, from the lower side of each of the standoff parts. It has a length that can be inserted downward into the hole formed in the wiring board, and the tip part can be flexibly deformed against elasticity so as to allow the insertion when inserting into the hole. A surface mount type electric device comprising: a plurality of projecting pieces having locking claws that are locked to the peripheral edge of the hole on the back surface side of the wiring board when the elastic recovery immediately follows. 2. The engaging claws of the plurality of projecting pieces are slidably contacted with the inner peripheral surface of the holes by pushing the projecting pieces into the holes of the wiring board from above to allow the inserting of the engaging claws. The surface-mounted electric device according to claim 1, wherein a cam-shaped surface that automatically bends and deforms each protruding piece against elasticity is formed. 3. The surface mount type electric device according to claim 1, wherein a standoff portion extending from the protrusion with the locking claw is formed on the lower surface of the base of the electric device body.