JP2998675B2 - Transformer and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used for various types of consumer equipment and the like, and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional transformer will be described below with reference to the drawings.

FIG. 4 is a perspective view of a conventional transformer, and FIG. 5 is a sectional view of the transformer taken along line AA. 4 and 5,
In a conventional transformer, a closed magnetic circuit core 7 is inserted into a through hole 2 of a bobbin body 5 in a bobbin body 5 made of a synthetic resin molded product having a flange portion 1 at both ends and having a through hole 2. A secondary terminal 4 which is a pin terminal is implanted in the flange 1, and two terminal through holes 1 are formed in the other flange 1.
0, a U-shaped primary terminal 3 having a bush 9 for fixing the terminal and not provided with an insulating coating is inserted into the secondary winding 6.
Is wound between the two flange portions and connected to the secondary terminal 4.

Further, in order to electrically connect the secondary terminal 4 and the secondary winding 6, the secondary terminal 4 and the secondary winding 6 are connected by soldering.

[0005] The secondary terminal 4 and the protruding portion 8 of the primary terminal 3 are mounted on a mounting board or the like to enable electrical connection.

[0006]

In the above-mentioned conventional configuration,
Since the primary terminal 3 is not coated with an insulating film, the upper portion 11 of the bobbin of the primary terminal 3 is exposed to the outside, and if moisture or the like adheres to the exposed portion, a short circuit may occur, and the reliability is reduced. Had the problem of causing

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a transformer having improved reliability by preventing a short circuit or the like by a primary terminal having no exposed portion.

[0008]

In order to achieve the above object, the present invention provides a bobbin main body having a flange at both ends and having a through hole, and a bobbin wound between both flanges of the bobbin main body. A secondary winding and a secondary terminal that is implanted in one flange of the bobbin main body and is connected to the secondary winding and two terminal through holes provided in the other flange of the bobbin main body. An inserted U-shaped primary terminal, and a closed magnetic circuit core inserted into a through hole of the bobbin main body, wherein the primary terminal has a protruding portion protruding from the bobbin main body to the bottom side, and an upper surface extending from the bobbin main body. Having an exposed portion exposed to the side, an intermediate portion between the projecting portion and the exposed portion, and covering the exposed portion and the intermediate portion with an insulating coating, and covering the projecting portion with a solder coating, The melting temperature of the insulating coating is lower than the melting temperature of the solder coating. It is a configuration.

According to the above configuration, since the exposed portion and the intermediate portion of the primary terminal are covered with the insulating film, it is possible to prevent a short circuit or the like from occurring.

Further, since the protruding portion is covered with a solder film that melts the insulating film, the insulating film is peeled off only by coating the solder film on the protruding portion coated with the insulating film, and the protruding portion is removed. Solder processing can be performed, and electrical connection to a mounting board or the like is enabled.

As a result, short-circuiting of the primary terminal can be easily prevented, and electrical connection to a mounting board or the like can be easily performed.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION
While having a flange at both ends, a bobbin main body having a through hole, a secondary winding wound between both flanges of the bobbin main body, and implanted in one flange of the bobbin main body,
A secondary terminal connected to the secondary winding, a U-shaped primary terminal inserted into two terminal through holes provided in the other flange portion of the bobbin main body, and a U-shaped primary terminal inserted into the through hole of the bobbin main body. A closed magnetic path core, wherein the primary terminal includes a protruding portion protruding from the bobbin main body to the bottom surface, an exposed portion exposed from the bobbin main body to the upper surface side, and an intermediate portion between the protruding portion and the exposed portion. Having a configuration in which the exposed portion and the intermediate portion are covered with an insulating film, and the projecting portions are covered with a solder film, and the melting temperature of the insulating film is lower than the melting temperature of the solder film. .

According to the above configuration, the exposed portion and the intermediate portion of the primary terminal are covered with the insulating film, so that occurrence of a short circuit or the like can be prevented.

Further, since the protruding portion is covered with a solder film that melts the insulating film, the insulating film is peeled off only by coating the solder film on the protruding portion coated with the insulating film, and the protruding portion is removed. Solder processing can be performed, and electrical connection to a mounting board or the like is enabled.

As a result, short-circuiting of the primary terminal can be easily prevented, and electrical connection to a mounting board or the like can be easily performed.

The second aspect of the present invention is the first aspect of the present invention.
In the invention described in the above, an insulation coating covering an intermediate portion of the primary terminal is melted and fixed to an inner wall of the terminal through hole of the bobbin main body.

According to the above configuration, the insulating coating covering the intermediate portion of the primary terminal is melt-fixed to the inner wall of the terminal through-hole of the bobbin main body, so that the primary terminal and the terminal through-hole are firmly fixed to each other. Of the primary terminal from the terminal through-hole can be prevented.

According to a third aspect of the present invention, there is provided a bobbin main body having a flange at both ends and having a through hole, and a secondary terminal planted on one of the flanges of the bobbin main body. And providing two through holes for terminals in the other flange portion of the bobbin main body, and forming U through the through holes for terminals.
Inserting a primary terminal having a U-shape, winding a secondary winding between both flange portions of the bobbin main body, and connecting the secondary winding to the secondary terminal; Inserting a core, and providing a step of coating the primary terminal with an insulating coating, and providing a step of coating a solder coating on a protruding portion of the primary terminal protruding on the bottom surface side of the bobbin main body, When the solder coating is applied to the portion, the insulating coating of the projecting portion is melted, and the insulating coating of the intermediate portion above the projecting portion is melted and fixed to the inner wall of the terminal through hole of the bobbin main body. is there.

According to the manufacturing method described above, a step of covering the primary terminal with an insulating film is provided, and a step of covering the projecting portion of the primary terminal protruding on the bottom surface side of the bobbin body with a solder film is provided. The exposed part and the middle part of the wire are coated with an insulating film to prevent short-circuits and the like.
It is possible to manufacture a transformer that does not hinder mounting on a mounting board or the like and that can be easily connected electrically.

Further, when the solder coating is applied to the projecting portion of the primary terminal, the insulating film of the projecting portion is melted, and the insulating film of the intermediate portion above the projecting portion is melted on the inner wall of the terminal through hole of the bobbin body. Since the primary terminal is fixed, the primary terminal and the terminal through-hole are firmly fixed, and a transformer capable of preventing the primary terminal from falling out of the terminal through-hole during mounting can be manufactured.

(Embodiment) FIG. 1 is a perspective view of a transformer according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a protruding portion of the transformer taken along the line AA before melting an insulating film, and FIG. It is AA sectional drawing after the insulating coating of a protrusion part fuse | melts.

1 to 3, a transformer according to an embodiment of the present invention has a bobbin main body 25 made of a synthetic resin molded article having flanges 21 at both ends and having a through hole 22; And a second winding 26 wound between the two flanges 21 of the bobbin main body 25.
And a secondary terminal 24 of a pin terminal connected to the secondary winding 26, and a polyurethane copper wire inserted into two terminal through holes 33 provided in the other flange 21 of the bobbin main body 25. U-shaped primary terminal 23 and bobbin main body 2
And a closed magnetic path magnetic core 27 inserted in the through hole 22 of No. 5.

The primary terminal 23 includes a protruding portion 28 protruding from the bobbin main body 25 to the bottom side, an exposed portion 29 exposed from the bobbin main body 25 to the upper side, a protruding portion 28 and the exposed portion 2.
9, the exposed portion 29 and the intermediate portion 30 are covered with an insulating coating 31, and the protruding portion 28 is covered with a solder coating 32 that melts the insulating coating 31.

Further, the insulating coating 31 covering the intermediate portion 30 of the primary terminal 23 is connected to the terminal through hole 3 of the bobbin main body 25.
3 is fixed to the inner wall 34.

Further, the manufacturing method includes a step of forming a bobbin main body 25 made of a synthetic resin molded product having a flange portion 21 at both ends and having a through hole 22;
5, a step of implanting a secondary terminal 24 of a pin terminal in one of the flanges 21; providing two through holes 33 for terminals in the other flange 21 of the bobbin body 25; Inserting a primary terminal 23 of a U-shaped copper wire, winding a secondary winding 26 between both flange portions 21 of the bobbin main body 25, and connecting the secondary winding 26 to the secondary terminal 24;
5. A step of inserting a closed magnetic path magnetic core 27 into the through hole 22 of the fifth embodiment, and a step of coating the primary terminal 23 with a polyurethane insulating film 31 are provided, and the protrusion of the primary terminal 23 projecting to the bottom side of the bobbin main body 25 is provided. A step of coating the solder film 32 on the portion 28 is provided. When the projecting portion 28 is covered with the solder film 32, the insulating film 31 of the projecting portion 28 is melted and the insulating film 31 of the intermediate portion 30 above the projecting portion 28 is removed. In this method, the projecting portion 28 is melted by heat at the time of coating the solder film 32, and is fused and fixed to the inner wall 34 of the terminal through hole 33 of the bobbin main body 25.

With the above configuration, the exposed portion 2 of the primary terminal 23
9 and the intermediate portion 30 are covered with the insulating film 31, so that a short circuit or the like can be prevented from occurring.

Further, since the protruding portion 28 is covered with the solder film 32 for melting the insulating film 31, the insulating film 31
By merely coating the solder film 32 on the protruding portion 28 coated with the solder, the insulating film 31 is peeled off, the protruding portion 28 can be soldered, and electrical connection to a mounting board or the like is enabled.

As a result, the short circuit of the primary terminal 23 can be easily prevented, and the electrical connection to the mounting board or the like can be easily performed.

Further, the insulating coating 31 covering the intermediate portion 30 of the primary terminal 23 is provided with the terminal through hole 3 of the bobbin main body 25.
3, the primary terminal 23 and the terminal through-hole 33 are firmly fixed, so that the primary terminal 23 can be prevented from falling out of the terminal through-hole 33 during mounting.

Further, the primary terminal 23
Is provided with a step of coating an insulating coating 31 on the bottom surface of the bobbin main body 25, and the protrusion 2
8 is provided with a step of coating the solder coating 32, so that the exposed portion 29 and the intermediate portion 30 of the primary terminal have the insulating coating 31.
Thus, it is possible to manufacture a transformer that does not hinder the occurrence of a short circuit or the like, does not hinder mounting on a mounting board or the like, and is easily connected electrically.

In addition, when the solder film 32 is coated on the protruding portion 28 of the primary terminal 23, the insulating film 31 of the protruding portion 28 is melted, and the insulating film 31 of the intermediate portion 30 above the protruding portion 28 is removed from the bobbin main body 25. Inner wall 3 of terminal through hole 33
4, the primary terminal 23 and the terminal through-hole 33 are firmly fixed, and the primary terminal 23 during mounting is fixed.
A transformer that can prevent the terminal from being pulled out of the terminal through-hole 33 can be manufactured.

As described above, according to the embodiment of the present invention,
The short circuit of the primary terminal 23 can be easily prevented, and the electrical connection to the mounting board or the like can be easily performed.

The insulating coating 31 covering the intermediate portion 30 of the primary terminal 23 is provided with a terminal through hole 33 of the bobbin main body 25.
If the primary terminal 23 and the terminal through-hole 33 are firmly fixed to the inner wall 34, the primary terminal 23 can be prevented from coming off from the terminal through-hole 33 during mounting.

In the embodiment of the present invention, in the manufacturing method, a step of covering the primary terminal 23 with the insulating film 31 is provided. However, a copper wire coated in advance with an insulation may be used as the primary terminal 23.

Further, the insulating film 31 may be any material other than the polyurethane copper wire as long as it has an insulating property and is melted by the solder film 32.

[0036]

As described above, according to the present invention, since the exposed portion and the intermediate portion of the primary winding are covered with the insulating film, it is possible to prevent the occurrence of a short circuit and the like,
Since the solder coating that melts the insulation coating is coated, just coat the solder coating on the protrusion covered with the insulation coating,
The insulating film is peeled off, and the protruding portion can be soldered, so that electrical connection to a mounting board or the like can be made possible.

As a result, it is possible to provide a transformer that can easily prevent a short circuit of the primary terminal and can easily perform an electrical connection to a mounting board or the like.

Further, since the insulating coating covering the intermediate portion of the primary terminal is melted and fixed to the terminal through-hole of the bobbin main body, the primary terminal and the terminal through-hole are firmly fixed to each other, and the primary terminal at the time of mounting is firmly fixed. It is also possible to prevent the terminal from coming out of the through hole.

Further, according to the manufacturing method of the present invention, a step of covering the primary terminal with an insulating film is provided, and a step of covering the projecting portion of the primary terminal protruding on the bottom side of the bobbin body with a solder film is provided. Since the exposed portion and the intermediate portion of the primary winding are covered with an insulating film, a transformer that can be mounted while preventing occurrence of a short circuit or the like can be manufactured.

In addition, when the solder coating is applied to the projecting portion of the primary terminal, the insulating film of the projecting portion is melted, and the insulating film of the intermediate portion above the projecting portion is melted and fixed to the through hole of the bobbin main body. In addition, it is possible to manufacture a transformer in which the primary terminal and the terminal through-hole are firmly fixed, and the primary terminal can be prevented from coming out of the terminal through-hole during mounting.

[Brief description of the drawings]

FIG. 1 is a perspective view of a transformer according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view taken along line AA of FIG.

FIG. 4 is a perspective view of a conventional transformer.

FIG. 5 is a sectional view of the transformer taken along line AA in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Flange 22 Through-hole 23 Primary terminal 24 Secondary terminal 25 Bobbin main body 26 Secondary winding 27 Closed magnetic circuit core 28 Projection part 29 Exposed part 30 Intermediate part 31 Insulation coating 32 Solder coating 33 Terminal through-hole 34 Inner wall

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-54-3222 (JP, A) JP-A-8-17664 (JP, A) JP-A-1-80916 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) H01F 27/28-27/30

Claims (3)

(57) [Claims] 1. A bobbin main body having a flange at both ends and having a through-hole, a secondary winding wound between both flanges of the bobbin main body, and one of the flanges of the bobbin main body. A secondary terminal connected to the secondary winding, a U-shaped primary terminal inserted into two terminal through holes provided in the other flange of the bobbin main body, and a penetrating through the bobbin main body. A closed magnetic path core inserted into the hole, wherein the primary terminal has a protruding portion protruding from the bobbin main body to the bottom side, an exposed portion exposed from the bobbin main body to the upper surface side, the protruding portion and the exposed portion An intermediate portion between the exposed portion and the intermediate portion is coated with an insulating coating, and the protruding portion is coated with a solder coating.The melting temperature of the insulating coating is lower than the melting temperature of the solder coating. Trance. 2. The transformer according to claim 1, wherein an insulating coating covering an intermediate portion of the primary terminal is melt-fixed to an inner wall of the terminal through-hole of the bobbin main body. 3. A step of forming a bobbin main body having a flange at both ends and having a through hole, a step of implanting a secondary terminal in one of the flanges of the bobbin main body, and the other of the bobbin main body. A step of inserting a U-shaped primary terminal into the terminal through-hole while providing two terminal through-holes in the flange of the terminal; and winding a secondary winding between both the flanges of the bobbin body. A step of connecting to the secondary terminal, and a step of inserting a closed magnetic circuit core into a through hole of the bobbin main body,
A step of coating the primary terminal with an insulating coating is provided, and a step of coating a solder coating on the protruding portion of the primary terminal protruding on the bottom side of the bobbin main body is provided. A method of manufacturing a transformer that melts the insulating coating of the projecting portion and melts and fixes the insulating coating of the intermediate portion above the projecting portion to the inner wall of the terminal through-hole of the bobbin main body.