JP2000252132A - Mounting structure for electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure for an electronic component which can be reliably fixed to a printed circuit board, having a simple structure and at a low cost. SOLUTION: An electronic component includes a main body 11 and a plurality of terminal pins, extending parallel to each other from the body 11. In the mounting structure of the electronic component, the terminal pins are inserted into associated mounting of a printed circuit board 15 and soldered upon mounting of the electronic component. The main body is formed with an engagement part 11a, and an end of a fixing member 16 engaged to the engagement part is engaged to a printed circuit board to thereby fix the electronic component to the printed circuit board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component mounting structure.

[0002]

2. Description of the Related Art Conventionally, an electronic component, for example, a switching transformer is configured as shown in FIG. That is, in FIG. 9, the switching transformer 1 includes a bobbin 2 that is a main body, a core 3 integrated with the bobbin 2, a coil 4 wound around the core 3, and a lower surface of the bobbin 2. And a plurality of protruding terminal pins 5.

[0003] The terminal pins 5 are inserted into mounting holes (not shown) provided in a mounting printed circuit board 6 at the time of mounting, and are soldered by solder 7, whereby the printed circuit board 6 is mounted. Are electrically connected to a conductive pattern (not shown) formed on the lower surface of the substrate, and are mechanically fixed and held.

In the switching transformer 1 having such a configuration, the above-mentioned fixed holding is sufficient when the switching transformer 1 itself is relatively light, but when the switching transformer 1 is relatively heavy, the switching is performed. Due to the drop or vibration of various devices or the like in which the transformer 1 is incorporated, a force is inadvertently applied to a soldered portion of the terminal pin 5 with respect to the conductive pattern of the printed circuit board 6. It may peel off.

For this reason, the number of terminal pins 5 is increased or the bobbin 2 is adhered to the surface of the printed circuit board 6 so as to increase the mounting strength of the switching transformer 1. In the case where is large, even if such measures are taken, the conductive pattern may peel off from the printed circuit board 6 due to the above-mentioned drop or vibration. In particular, when the switching transformer 1 is attached to the surface of the printed circuit board 6 with an interval, the conductive pattern is likely to peel off. In the case of bonding, it is not easy to control the amount of the adhesive applied to the switching transformer 1 or the printed circuit board 6, and a dispenser and a jig are required. There has been a problem that the system becomes complicated and costs and operation time increase.

On the other hand, conventionally, as shown in FIGS. 10 and 11, for example, a metal frame 8 is provided so as to surround the core 3 and the coil 4, and the metal frame 8 extends downward from the lower end of the metal frame 8. The extending leg 8a is connected to the printed circuit board 6.
12 and FIG. 1 and soldered with the solder 7 in the same manner as the terminal pins 5.
As shown in FIG. 3, a resin cover 9 is provided so as to cover the entire switching transformer 1, and an engagement hook 9 a protruding from a lower end of the resin cover 9 is engaged with an engagement hole (not shown) provided in the printed circuit board 6. ).

[0007]

However, in the mounting structure of the switching transformer 1 using the metal frame 8 and the resin cover 9 described above, the peeling of the conductive pattern due to dropping, vibration, etc., due to the increased mounting strength. Although it can be reliably avoided, fixed parts such as the metal frame 8 and the resin cover 9 are required, and a press die and a forming die for these fixed parts are required.
In addition to increasing the component cost, and particularly in the case of the switching transformer 1, the metal frame 8 affects the insulation characteristics and the noise characteristics, so that it could not be actually used.

[0008] Such a problem applies not only to a switching transformer but also to an electronic component whose main body such as a line filter is fixed to a printed board by soldering terminal pins.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide an electronic component mounting structure that can be securely fixed to a printed circuit board with a simple configuration at low cost.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the present invention, a main body and a plurality of terminal pins extending parallel to each other from the main body, each terminal pin corresponding to a printed circuit board when mounted. Regarding the electronic component to be inserted into the mounting hole and soldered, an engaging portion is formed in the main body, and an end of the fixing member engaged with the engaging portion is locked to the printed circuit board. This is achieved by the mounting structure of the electronic component, wherein the electronic component is fixed to the printed circuit board.

In the electronic component mounting structure according to the present invention, preferably, an end of the fixing member is inserted into a printed circuit board and soldered.

In the electronic component mounting structure according to the present invention, preferably, the fixing member is formed in a shape such that one end thereof can be engaged with the engaging portion of the main body.

[0013] According to the above configuration, the main body of the electronic component is locked to the printed board by the end of the fixing member engaged with the engaging portion formed on the main body. It will be fixedly held.

Therefore, even if a force is applied to the main body of the electronic component due to the weight of the electronic component due to the drop or vibration of various devices or the like in which the electronic component is incorporated, the main body is fixed to the printed circuit board by the fixing member. Since the terminal pins are mechanically fixed and held, no inadvertent force is applied to the portions where the terminal pins are soldered to the printed circuit board. As a result, the conductive pattern does not peel off from the surface of the printed circuit board at the portion where the terminal pins of the electronic component are soldered to the conductive pattern on the printed circuit board. Can be fixedly held.

When the end of the fixing member is inserted into the printed circuit board and soldered, the end of the fixing member is auxiliaryly fixed to the printed circuit board.
When the terminal pins of the electronic component are soldered to the conductive pattern on the printed circuit board, they are soldered at the same time, so that the number of steps does not increase and the increase in cost can be suppressed.

When the fixing member is formed in a shape such that one end thereof can be engaged with the engaging portion of the main body, the fixing member can be formed with a simple configuration at a low cost.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 shows a first embodiment of an electronic component mounting structure according to the present invention.
In FIG. 1, an electronic component 10 is a switching transformer, and includes a bobbin 11 that is a main body, a core 12 integrated with the bobbin 11, a coil 13 wound around the core 12, and a bobbin 11. And a plurality of terminal pins 14 protruding downward from the lower surface.

The terminal pins 14 are inserted into mounting holes (not shown) provided in a printed circuit board 15 for mounting, as in the case of the terminal pins 5 shown in FIG. By being soldered by the solder, it is electrically connected to a conductive pattern (not shown) formed on the lower surface of the printed board 15.

The above configuration is the same as the conventional electronic component mounting structure shown in FIG. 9, but in the electronic component mounting structure according to the present invention, the main body 11 is shown in FIGS. Thus, each side edge is provided with an engagement hole 11a. As shown in detail in FIG. 3, the engagement hole 11a has two parallel holes 11e on the lower side (the printed circuit board 15 side).
11e, and the upper side is the two parallel holes 11e, 1
It is a long hole containing 1e.

As shown in FIGS. 2 and 3, an inverted U-shaped fixing member 16 is engaged with the engaging hole 11a. When the fixing member 16 is engaged from above in FIG. 3, the two legs 16a, 16b are inserted into the two parallel holes 11e, 11e below the engaging hole 11a, and The connecting portion 16c is inserted into the long hole above the engaging hole 11a, and the connecting portion 16c abuts on the bottom of the long hole to engage with the engaging hole 11a. 16a and 16b project from the lower surface of the engagement hole 11a of the main body 11, and further project downward from the lower surface of the printed circuit board 15.

The electronic component mounting structure according to the embodiment of the present invention is configured as described above. When the electronic component 10 is mounted on the printed circuit board 15, the mounting is performed as follows. First, the electronic component 10 is inserted into the corresponding mounting hole of the printed circuit board 15 by inserting the terminal pins 14 protruding from the lower surface of the main body 11 into the printed circuit board 15.
At a predetermined position.

Next, the fixing members 16 are inserted into the respective engaging holes 11a of the main body 11 of the electronic component 10 from above (see FIG. 3). Then, the legs 16a, 16b of the fixing member 16 protruding downward from the lower surface of the printed circuit board 15.
Are bent outwardly from each other, as shown by arrows in FIG. 4, and are mechanically fixed. Thereafter, the portions of the terminal pins 14 of the electronic component 10 and the legs 16a and 16b of the fixing member 16 protruding from the lower surface of the printed board 15 are formed on the lower surface of the printed board 15 by, for example, reflow soldering. Soldered to. Thus, each terminal pin 14 is electrically connected to the corresponding conductive pattern on the printed board 15, and the legs 16 a and 16 b of the fixing member 16 are mechanically fixed to the printed board 15. become.

In this case, the fixing member 16 is connected to the connecting portion 1.
6c engages with the bottom of the long hole in the engaging hole 11a of the main body 11, and its legs 16a, 16b
By being bent as shown in FIG. 4 on the lower side, the shape is fixed to the printed circuit board 15 and is also fixed to the printed circuit board 15 by soldering. Therefore, the electronic component 10 may be dropped or vibrated by various devices in which the electronic component 10 is incorporated.
Even if a force is applied to the main body 11, the main body 11 is mechanically fixed and held to the printed board 15 by the fixing member 16, so that the force escapes to the printed board 15 via the fixing member 16. Therefore, no force is applied carelessly to the soldered portion of the terminal pin 14 to the printed board 15. Accordingly, the conductive pattern does not peel off from the surface of the printed board 15 at the portion where the terminal pins 14 of the electronic component 10 are soldered to the conductive pattern of the printed board 15, and the electronic component 10 is attached to the printed board 15. On the other hand, it can surely be fixedly held mechanically.

FIGS. 5 and 6 show a second embodiment of the electronic component mounting structure according to the present invention. 5 and 6
In the above, the mounting structure of the electronic component has substantially the same configuration as the mounting structure of the electronic component shown in FIGS. 1 to 4, but includes an engaging groove 11 b instead of the engaging hole 11 a as the engaging portion. The only difference is in the configuration. This engagement groove 1
1b is formed at the side edge of the main body 11 in an inverted U-shape along the upper surface and both side surfaces so that the above-mentioned inverted U-shaped fixing member 16 is engaged in the engagement groove 11b. Has become.

According to the electronic component mounting structure having such a configuration, when the fixing member 16 is inserted from above, the lower ends of the two legs 16a and 16b of the fixing member 16 are brought into engagement with both sides. Along the groove 11b, it further penetrates the mounting hole of the printed circuit board 15, and when the connecting portion 16c contacts the bottom edge of the engaging groove 11b on the upper surface, it projects downward from the lower surface of the printed circuit board 15. Then, the leg 1 of the fixing member 16
By bending the lower ends of 6a and 16b in the same manner as in FIG. 4, the main body 11 is mechanically fixed on the printed circuit board 15, and thereafter, when the terminal pins 14 of the electronic component are soldered, The lower end of the fixing member 16 is also the printed circuit board 1.
5 is soldered to the lower surface.

FIG. 7 shows a third embodiment of the electronic component mounting structure according to the present invention. 7, an engagement hole 11c is formed in each side edge of the main body 11 of the electronic component 10. The engaging hole 11c has a lower side formed as a small-diameter hole 11f, and an upper side formed as an enlarged hole 11g thicker in at least one direction than the small-diameter hole. The fixing member 17 is engaged with the engagement hole 11c. As shown in FIG. 7, the fixing member 17 has a head 17a that is enlarged in at least one direction corresponding to the shape of the enlarged hole 11g above the engagement hole 11c.

According to the electronic component mounting structure having such a configuration, when the fixing member 17 is inserted from above, the lower end of the fixing member 17 becomes the small diameter hole 1c of the engagement hole 11c.
When the head 17a comes into contact with the bottom edge of the enlarged hole 11g of the engagement hole 11c, it protrudes downward from the lower surface of the printed circuit board 15 through 1f. Then, the lower end of the fixing member 17 is bent in the same manner as in FIG. 4, so that the main body 11 is mechanically fixed on the printed circuit board 15, and thereafter, when the terminal pins 14 of the electronic component are soldered. Then, the lower end of the fixing member 17 is also soldered to the lower surface of the printed board 15.

FIG. 8 shows a fourth embodiment of the electronic component mounting structure according to the present invention. 8, an engaging hole 11d is formed at each side edge of the main body 11 of the electronic component 10. The lower side of the engaging hole 11d is formed as a small-diameter hole 11h, and the upper side of the engaging hole 11d is formed from the small-diameter hole.
1 is formed as a groove 11i extending toward the side edge. The fixing member 18 is engaged with the engagement hole 11d. As shown in FIG. 8, the fixing member 18 has a head 18a that is bent at a substantially right angle to one side corresponding to the shape of the groove 11i above the engagement hole 11d.

According to the electronic component mounting structure having such a configuration, when the fixing member 18 is inserted from above, the lower end of the fixing member 18 becomes the small hole 1d of the engaging hole 11d.
1h, further penetrates the mounting hole of the printed board 15, and when the head 18a contacts the bottom edge of the groove 11i of the engaging hole 11d, it protrudes downward from the lower surface of the printed board 15. Then, the lower end of the fixing member 18 is bent in the same manner as in FIG. 4, so that the main body 11 is mechanically fixed on the printed circuit board 15. Thereafter, when the terminal pins 14 of the electronic component are soldered, Then, the lower end of the fixing member 18 is also soldered to the lower surface of the printed board 15.

In the above embodiment, the electronic component 1
Although the case of the switching transformer has been described as 0, the present invention is not limited to this, and the present invention can be applied to an electronic component having a plurality of terminal pins projecting from the main body such as a bobbin to the lower surface, for example, a line filter. Is clear.

[0031]

As described above, according to the present invention, the end of the fixing member engaged with the engaging portion formed on the main body of the electronic component is locked to the printed circuit board. Accordingly, the printed circuit board is mechanically fixed and held. Therefore, even if a force is applied to the main body of the electronic component due to the weight of the electronic component due to a drop or vibration of various devices or the like in which the electronic component is incorporated, the main body is mechanically attached to the printed circuit board by the fixing member. Since the terminal pins are fixed and held, no inadvertent force is applied to the portions where the terminal pins are soldered to the printed circuit board. This allows
The conductive pattern does not peel from the surface of the printed circuit board at the soldering of the terminal pins of the electronic component to the conductive pattern on the printed circuit board, and the electronic component is securely mechanically fixed to the printed circuit board Can be done.

When the end of the fixing member is inserted into the printed circuit board and soldered, the end of the fixing member is auxiliary fixed to the conductive pattern of the printed circuit board and the electronic component is fixed. When the terminal pins are soldered to the conductive pattern of the printed circuit board at the same time, they are soldered at the same time, so that the number of steps does not increase and the increase in cost can be suppressed.

Thus, according to the present invention, it is possible to provide an extremely excellent mounting structure for electronic components, which can be securely fixed to a printed circuit board at a low cost with a simple structure.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view illustrating a configuration of a first embodiment of an electronic component mounting structure according to the present invention.

FIG. 2 is a partially enlarged perspective view showing a main part of the mounting structure of the electronic component of FIG. 1;

FIG. 3 is a partially enlarged cross-sectional view illustrating a main part of the mounting structure of the electronic component in FIG. 1;

FIG. 4 is a partially enlarged cross-sectional view showing a locked state in the electronic component mounting structure of FIG. 4;

FIG. 5 is a partially enlarged perspective view showing a configuration of a main part of a second embodiment of an electronic component mounting structure according to the present invention.

FIG. 6 is a partially enlarged cross-sectional view illustrating a main part of the mounting structure of the electronic component in FIG. 5;

FIG. 7 is a partially enlarged cross-sectional view showing a configuration of a main part of a third embodiment of an electronic component mounting structure according to the present invention.

FIG. 8 is a partially enlarged perspective view showing a configuration of a main part of a fourth embodiment of an electronic component mounting structure according to the present invention.

FIG. 9 is a side view showing an example of a conventional electronic component mounting structure.

FIG. 10 is a side view showing another example of a conventional electronic component mounting structure.

11 is a front view showing a mounting structure of the electronic component of FIG. 10;

FIG. 12 is a side view showing still another example of a conventional electronic component mounting structure.

13 is a front view showing a mounting structure of the electronic component of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electronic component 11 Main body 11a, 11c, 11d Engagement hole 11b Engagement groove 12 Core 13 Coil 14 Terminal pin 15 Printed circuit board 16, 17, 18 Fixing member 16a, 16b Leg 16c Connecting part 17a, 18a Head

Claims (3)

[Claims] 1. An electronic component, comprising: a main body; and a plurality of terminal pins extending parallel to each other from the main body, wherein each of the terminal pins is inserted into a corresponding mounting hole of a printed circuit board at the time of mounting and is soldered. An engaging portion is formed in the main body, and the electronic component is fixed to the printed circuit board by locking an end of the fixing member engaged with the engaging portion to the printed circuit board. A mounting structure for electronic components, characterized in that: 2. An end of the fixing member is inserted into a printed circuit board and soldered.
The mounting structure of the electronic component according to 1. 3. The electronic component mounting structure according to claim 1, wherein the fixing member is formed in a shape such that one end thereof can be engaged with an engaging portion of the main body.