JPH09306749A - Transformer and fixing of transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mounting strength of a transformer on a printed wiring board, by constituting the transformer to include a transformer body formed by providing a winding around a bobbin and incorporating a core, and a lead erected upright from a bobbin bottom portion, with a supporting stand engaged with the bobbin bottom portion. SOLUTION: A transformer 1 is prepared which has a transformer body 2 formed by providing a winding 4 around a bobbin 3 and incorporating a core 5, and a releasable supporting stand 8 on a bobbin bottom portion 6. A lead 7 standing upright from the bobbin bottom portion 6 is inserted into a through-hole 13 formed in a printed wiring board 11. After the lead 7 inserted in the through-hole 13 is soldered 14, the printed wiring board 11 is sealed with a potting resin 12. In this case, the potting resin 12 enters an engagement hole 9 with which an engagement pawl 10 of the supporting stand 8 is engaged, and the potting resin 12 is charged up to the upper surface of the bobbin bottom portion 6 in the engagement hole 9. When the potting resin 12 is cured, the anchor effect enables fixing the transformer 1 onto the printed wiring board 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used in electronic equipment, electric equipment, etc., and a method for mounting the transformer.

[0002]

2. Description of the Related Art In recent years, electronic parts such as transformers for the purpose of transforming and transforming have come to be mounted on various electronic devices and electric devices.

In addition, the usage of electronic equipment has expanded, and electronic equipment that can be used in any environment has been demanded. For example, it has come to be used in a place where there is a lot of dust or in a high humidity environment.

Therefore, the above electronic parts have been mounted on a printed wiring board and then sealed with potting resin.

A conventional method for fixing a transformer will be described below. FIG. 4 is a perspective view of a conventional transformer, and FIG. 5 is a sectional view showing a method of fixing the conventional transformer. As shown in FIG. 4, the transformer is composed of a transformer body 2 formed by winding a winding 4 on a bobbin 3 and incorporating a core 5, and leads 7 standing from a bottom 6 of the bobbin. Above transformer 1
In order to fix the printed wiring board 11 to the printed wiring board 11, the lead 7 standing from the bobbin bottom 6 is inserted into the through hole 13 formed in the printed wiring board 11, and the lead 7 and the printed wiring board 1
After soldering 14 of No. 1, the printed wiring board 11 was sealed and fixed with potting resin 12.

However, in order to secure the water resistance and the mounting strength, as shown in FIG. 5, the potting resin 12 is filled up to the upper surface of the bobbin bottom portion 6. Therefore, the filling amount of the potting resin 12 is increased, and the weight of the electronic device filled with the potting resin 12 is also increased.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the mounting strength for mounting on a printed wiring board and to provide a small amount of potting resin. It is an object of the present invention to provide a transformer that can be sealed with and a method of fixing the transformer.

[0008]

A transformer of the invention according to claim 1 has a transformer main body 2 formed by winding a bobbin 3 on a bobbin 3 and incorporating a core 5, and a lead 7 standing from a bottom 6 of the bobbin. Then, the support base 8 which can be attached to and detached from the bobbin bottom portion 6
It is characterized by having.

A transformer according to a second aspect of the present invention is characterized in that the support base 8 according to the first aspect has an engaging claw 10 capable of engaging with an engaging hole 9 formed in the bottom 6 of the bobbin. .

A transformer fixing method according to a third aspect of the present invention is a transformer 1 having a transformer main body 2 formed by winding a bobbin 3 with a winding 4 and incorporating a core 5, and a detachable support 8 on the bottom 6 of the bobbin. Lead 7 standing upright from bobbin bottom 6 of through hole 13 formed in printed wiring board 11
And soldering 14 the lead 7 inserted into the through hole 13 and then sealing the printed wiring board 11 with the potting resin 12.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a transformer showing an embodiment of the present invention. The transformer of the present invention, as shown in FIG.
The bobbin 3 is formed by winding the winding 4 and incorporating the core 5 into the transformer body 2, and the lead 7 standing from the bobbin bottom portion 6. The bobbin bottom portion 6 is engaged with the support base 8.

The support base 8 has an engaging claw 10 that engages with an engaging hole 9 formed in the bottom 6 of the bobbin so that it can be attached to and removed from the bottom 6 of the bobbin. Therefore,
As shown in the drawing, when the support base 8 is engaged, the engaging claws 10 project from the upper surface of the bobbin bottom portion 6. Further, even when the support base 8 is engaged with the bobbin bottom portion 6, the support base 8 does not protrude from the tips of the leads 7, and when the transformer 1 is mounted on the printed wiring board 11, the support base 8 serves as the printed wiring board 11. It abuts the surface and suppresses the lead 7 from being further inserted into the through hole 13. Also, printed wiring board 1
By bringing the support base 8 into contact with the surface of the transformer 1, the posture of the transformer body 2 can be maintained correctly. Further, the height at which the transformer 1 is fixed can be adjusted by engaging the support bases 8 having different heights. However, the ends of the leads 7 inserted into the through holes 13 protrude from the back surface of the printed wiring board 11.

A method for fixing the above transformer will be described. FIG.
FIG. 3 is a sectional view showing a method of fixing a transformer according to an embodiment of the present invention, and FIG. 3 is an enlarged sectional view of a main part of FIG.

First, the bobbin 3 is wound with the winding 4, and the core 5
Transformer main body 2 formed by incorporating
A transformer 1 having a detachable support base 8 is prepared, and leads 7 erected from the bobbin bottom 6 are provided on the printed wiring board 1.
1 is inserted in the through hole 13 formed. At this time, the support base 8 engaged with the bobbin bottom portion 6 is attached to the printed wiring board 11.
It is possible to suppress the insertion amount of the lead 7 by contacting the surface of the transformer and to maintain the posture of the transformer body 2 correctly.
Then, after the lead 7 inserted into the through hole 13 is soldered 14, the printed wiring board 11 is sealed with the potting resin 12.

As shown in FIG. 3, the potting resin 12 that seals the printed wiring board 11 infiltrates into the engagement hole 9 with which the engagement claw 10 of the support base 8 engages by a capillary phenomenon. Therefore, by filling the lower surface of the bobbin bottom portion 6 of the transformer 1 with the potting resin 12, the potting resin 12 penetrates into the gap between the engaging hole 9 and the engaging claw 10 and reaches the upper surface of the bobbin bottom portion 6 of the engaging hole 9. The potting resin 12 is filled.

As a result, when the potting resin 12 hardens, the support base 8 is fixed to the transformer body 2, and the transformer 1 can be fixed to the printed wiring board 11 by the anchor effect.

Therefore, conventionally, the potting resin 12 is filled up to the upper surface of the bobbin bottom portion 6, but the transformer 1 can be fixed by filling the potting resin 12 up to the lower surface of the bobbin bottom portion 6.

The side surface of the support base 8 and the engaging claw 1 are also provided.
By forming an opening hole in 0, the potting resin 12
It is possible to improve the adhesiveness of, and further firmly adhere.

According to the transformer of the present invention as described above,
Since the bobbin 3 is formed by winding the winding 4 and incorporating the core 5 into the transformer body 2 and the lead 7 standing upright from the bobbin bottom 6, the bobbin bottom 6 is engaged with the support base 8. By filling the potting resin 12 when the transformer 1 is mounted on the printed wiring board 11, the transformer 1 can be firmly fixed while maintaining a fixed posture.

[0021]

According to the transformer and the method of fixing the transformer of the present invention, the bobbin comprises a transformer body formed by winding the core and incorporating the core, and a lead standing upright from the bottom of the bobbin. Since the transformers are engaged with each other, the transformer can be firmly fixed to the printed wiring board in a fixed posture and the mounting strength can be improved. Moreover, since the transformer can be fixed by filling the potting resin up to the back surface of the bottom of the bobbin, the filling amount of the potting resin can be reduced and the weight can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a fixing method of a transformer according to an embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of a transformer according to an embodiment of the present invention.

FIG. 4 is a perspective view showing an example of a conventional embodiment.

FIG. 5 is a cross-sectional view showing a method of fixing a transformer according to a conventional embodiment.

[Explanation of symbols]

 1 transformer 2 transformer body 3 bobbin 4 winding 5 core 6 bobbin bottom 7 lead 8 support base 9 engaging hole 10 engaging claw 11 printed wiring board 12 potting resin 13 through hole 14 soldering

Claims (3)

[Claims] 1. A transformer comprising a transformer body formed by winding a bobbin and incorporating a core, a lead standing upright from a bottom portion of the bobbin, and a detachable support base on the bottom portion of the bobbin. 2. The transformer according to claim 1, wherein the support base has an engagement claw capable of engaging with an engagement hole formed in a bottom portion of the bobbin. 3. A transformer main body formed by winding a bobbin and incorporating a core, and a lead erected from the bottom of the bobbin of the transformer having a detachable support on the bottom of the bobbin, are provided in a through hole formed on a printed wiring board. A method for fixing a transformer, which comprises inserting the leads into the through holes and soldering the leads, and then sealing the printed wiring board with potting resin.