JPH0244504Y2 - - Google Patents

Description

[Detailed explanation of the idea] "Industrial application field" This invention relates to a small transformer.

``Prior Art'' For example, many camera strobes have recently been incorporated into the camera body, and the transformer used therein is densely arranged and housed together with other components in a limited occupied space. Therefore, this type of transformer is required to be miniaturized and manufactured more efficiently, and the magnetic field formed by the current flowing through the transformer windings is almost completely confined within the closed magnetic circuit of the transformer, reducing magnetic flux leakage to the outside. It is desirable to have no.

The shape of the bobbin 11 shown in FIG. 1 is for a conventionally used small transformer of this type.For example, a cylindrical bobbin body 1 made of synthetic resin material.
Flanges 13 and 14 are integrally formed on both end edges of 2. A winding 15 is wound around the circumferential surface of the bobbin body 12 between the flanges 13 and 14. The winding 15 may be wound directly onto the bibbin body 12, or the winding 15 may be wound onto the bobbin body 12 coated with, for example, epoxy insulating paint or wrapped with insulating tape.

Terminal bases 16 and 17 are integrally formed on the opposing edges of one collar 13.
6 and pins 18-1 to 18-3 are also connected to the terminal base 17.
Pins 19-1 and 19-2 are installed parallel to each other. The ends of the primary and secondary windings of the winding 15 as well as other take-out windings are connected to these pins 1, respectively.
A transformer is configured by being connected to 8-1 to 18-3 and 19-1, 19-2.

To connect between the collars 13 and 14 of the bobbin 11,
The closed magnetic circuit plates 20-1 and 20-2 are attached, and the magnetic field generated by the current flowing through the winding 15 is transmitted to these collars 13 and 14 and the closed magnetic circuit plates 20-1 and 20-2.
It is made to be confined within a closed magnetic path formed by. The closed magnetic path plate 20-1 is made of a magnetic material and has an E-shape as shown in FIG.
0-1A is inserted into the opening 12-E of the collar 13 and attached to the bobbin 11. Closed magnetic circuit plates 20-2 of the same shape are similarly attached to the bobbin 11 on the collar 14 side, and each closed magnetic circuit plate is attached to the leg 20-2.
1A and 20-2A, 20-1B and 20-2
B, 20-1C and 20-2C are attached in a state where they are facing each other. The contacting surfaces of each leg are polished and placed in close contact with each other to prevent an air layer between the contacting surfaces and increasing magnetic resistance.
It is fixed by means of side gluing.

If necessary, an insulating paint such as epoxy is applied to the surfaces of the winding 15, the flanges 13 and 14, and the closed magnetic circuit plates 20-1 and 20-2, and the entire assembly is assembled as shown in FIG.

In this conventionally used small transformer, the legs 20-1A and 20 of the closed magnetic circuit plates 20-1 and 20-2 are
In order to improve assembly work efficiency, it is necessary to form the -2A so that it can be easily inserted into the closing opening 12-E. For this reason, it is necessary to form the cross sections of the legs 20-1A and 20-2A into a small similar shape with relatively more play than the opening 12-E. Also, the closed magnetic plate 20-
Legs 2 arranged outside the winding 15 of 1, 20-2
0-1B, 20-2B and 20-1C, 20-2
Unless a predetermined distance is provided between C and the surface of the winding 15, the assembly work cannot be performed quickly.

Conventionally, the closed magnetic path plates 20-1 and 20-2 were attached to the bobbin 11 under such conditions, so the closed magnetic path plates 20-1 and 20-2 were structurally extended to the outside, and the flange was The edges of 13 and 14 also protrude outward, impeding the requirements for miniaturization. Also, the overall magnetic path length is relatively long, and the bobbin body 1
1 is not completely filled with the legs 20-1A and 20-1B, it is difficult to completely confine the magnetic flux, and leakage magnetic flux may occur.

``Problems to be solved by the invention'' This invention solves the various drawbacks of conventional small transformers, has a structure that allows for easy and quick assembly, and perfect magnetic flux confinement. To provide a compact transformer that protects the windings by surrounding the windings from the outside with a terminal board, can significantly reduce the overall shape, and can be manufactured and assembled efficiently.

"Structure of the invention" In this invention, rectangular flanges are integrally formed on both end surfaces of the core body, and one side of these flanges and the side of the core body are configured to be located on a first common plane. be done.

On the other hand, a bobbin is provided, and flanges are integrally formed at both ends of the bobbin. This bobbin covers the circumferential surface of the core body except for the side surfaces, and is attached to the core body with the flanges facing the mutually opposing inner surfaces of the collar.

The terminal board is formed in a shape in which two terminal mounting portions are connected to each other by a connecting portion, and the connecting portion and the two terminal mounting portions are configured to be located on a second common plane. This terminal board is attached to the core body with the first and second common planes facing each other and the terminal attachment portion positioned on one side of the collar. In this attached state, a terminal is planted on the protruding end surface of the terminal attachment part, a winding is applied on the bobbin and the connecting part, the winding is connected to the terminal, and a yoke is connected and arranged between the flanges.

Hereinafter, the compact transformer of this invention will be explained in detail based on the embodiments using the drawings.

Figure 4 shows the core body 3 of the small transformer of this invention.
This shows the state in which the yoke 33 is attached to 1.
For example, rectangular flanges 32-1 and 32-2 are integrally formed on both end surfaces of a rectangular plate-shaped core body 31 made of a magnetic material such as manganese ferrite.
One side of these flanges 32-1, 32-2 and a side of the core body 31 are configured to be located on a common plane.

In this invention, a common plane on which one side of the brim 32-1, 32-2 and the side of the core body 31 are located,
Let us call it the first common plane _H1 .

The bobbin 34 is made of synthetic resin material with a thickness of 0.3 mm, for example.
As shown in FIG. 5, it is formed into a substantially rectangular tube shape with one side open. At both ends of the bobbin 34,
Flanges 35-1 and 35-2 are integrally formed,
The peripheral edge portions of the open side surfaces of the bobbin 34 are bent and extended in directions approaching each other so as to slightly narrow the open surface, and claws 36-1 and 36-2 are formed in these extended portions. Since the bobbin 34 having such a shape is entirely formed of a thin film-like synthetic resin material, it has sufficient flexibility.

As shown in FIG. 8, the bobbin 34 is connected to the core body 3.
It is attached to the core body 31 so as to cover the circumferential surface of the core body 31 except for the side surfaces of the core body 31 . In this attached state, the flanges 35-1, 35- of the bobbin 34
2 are in contact with the mutually opposing inner surfaces of the flanges 32-1 and 32-2 of the core body 31. Since the flanges 35-1 and 35-2 are in contact with the flanges 32-1 and 32-2, respectively, the bobbin 34 attached to the core body 31 is positioned tightly against the core body 31. It is installed with

The terminal board 37 is assembled to the first common plane _H1 on which the side surface of the core body 31 that is not covered by the bobbin 34 and one side surface of the flanges 32-1 and 32-2 are located. The terminal board 37 to be assembled is made of, for example, a synthetic resin material containing glass fiber and has a shape as shown in FIG. 6.

That is, the terminal board 37 has a shape in which two substantially rectangular terminal mounting portions 38-1 and 38-2 are connected to each other by a plate-like connecting portion 39 at one side edge of the central position. It is formed. Terminal mounting part 38-1, 3
8-2 and a connecting portion 39 that connects these terminal attachment portions are configured to be located on a common plane.

In this invention, this common plane is called a second common plane.
Let's call it _H2 .

Terminals t 1 to t ₆ are planted on the plate surface at a position opposite to the plate surface located on the second common plane H ₂ of the terminal attachment portions 38 - ₁ and 38 - 2 . Also, grooves 40-1, 40-2 and 41-1, 41 are provided between each terminal.
-2 is formed. The grooves 40-1 and 40-2 are deeper than the grooves 41-1 and 41-2.

The length in the longitudinal direction of the terminal attachment parts 38 - 1 and 38 - 2 of the connecting part 39 is the same as that of the collar 32 of the core body 31 .
The tapered surface Tp is formed so that the length in the longitudinal direction of the terminals -1 and 32-2 is approximately equal to each other, and this length is narrowed in the protruding direction of the terminals _t1 to _t6 . The thickness of the plate surface of the connecting portion 39 is approximately 0.4 to 0.5
It is set to mm.

With the bobbin 34 attached to the core body 31, the first side where the side surface of the core body 31 that is not covered by the bobbin and one side of the collars 32-1 and 32-2 are located.
The terminal board ₃₇ is made such that the second common plane H2 on which the terminal mounting parts 38-1, 38-2 and the connecting part ₃₉ of the terminal board 37 are located are aligned with the common plane H1 of the terminal board 37. It is assembled to the core body 31. When assembling, the bobbin 34
The connecting portion 39 is pushed inside the claws 36-1, 36-2, and the connecting portion 39 is temporarily fixed by the claws 36-1, 36-2 along the tapered surface Tp.

While maintaining this assembly position, the core body 31, bobbin 34, and terminal board 37 are fixed to each other using, for example, instant adhesive. Furthermore, Tsuba 32-
The winding 45 is placed on the bobbin 34 between 1 and 32-2.
is wound, and the ends of the primary winding and secondary winding of the winding 45 and the ends of other take-out windings are connected to the terminal pin t ₁
- electrically connected to a predetermined position at _t6 . At this time, the deep grooves 40-1 and 40-2 are used to lead out the ends of the windings located inside, and the shallow grooves 41
-1, 41-2 are used to derive the ends of the windings located on the outside.

The yoke 33 is fixed between the flanges 32-1, 32-2 of the core body 31, for example, by adhesive means, so that the core body 31, the flanges 32-1, 32-2, and the yoke 33 constitute a closed magnetic path. . At this time, the plate surfaces of the yoke 33 and the flanges 32-1, 32-2 that are in contact with each other are polished to prevent an air layer from being formed on the joint surfaces and increasing magnetic resistance.

When polishing the side surfaces of the flanges 32-1 and 32-2 that connect with the yoke 33, the winding 4
5 and before the terminal board 37 is attached, the first common plane H ₁ is magnetically attracted and fixed by a fixing magnet, so that the polishing work can be performed stably and accurately. In this way, the entire surface of the core body 31 and the brim 32-1, 32-2 is attracted and fixed to the fixing magnet during the work, so polishing is performed in a stable state, and the work efficiency is greatly improved. do.

Structurally, the terminal board 37 is connected to the collar 32-1, respectively.
It is continuously fixed to the side surface of the wire 32-2, and has a shape that surrounds and protects the winding 45 from the direction of the winding axis, resulting in a solid structure as a whole. Even during assembly, the claws 36-1, 36- formed on the bobbin 34
Since the work can be done while temporarily fixing the parts using 2, the assembly work can be done easily and with high precision.
In addition, unlike conventional products, the magnetic path piece is not inserted into the hollow part of the bobbin, but the flexible bobbin 34 is attached to the core body 31 so that there is no wasted installation space. The overall size is smaller, and high dimensional accuracy is not required when manufacturing parts, making it suitable for mass production.

Furthermore, in terms of structure, insulation treatment for the core body 31 is realized using the connecting portion 39, and there is no need to apply insulating paint to the core body 31 unlike in the conventional case, and work efficiency is greatly improved.

The winding axis direction of the winding 45 is between the terminal board 37 and the collar 32.
-1, 32-2 are regulated and positioned with the outer surface of
Also, the direction perpendicular to the winding axis direction of the winding 45 is the flange 32-
1, 32-2 and the yoke 33 for regulating positioning, and the entire structure is greatly reduced in size into a cubic shape. With this invention, it is possible to obtain a small transformer with dimensions of, for example, 7 mm x 6 mm x 6 mm. In addition, a closed magnetic path with a short magnetic path length is formed by the core body 31, the collars 32-1, 32-2, and the yoke 33, and is made of a magnetic material with high magnetic permeability over the entire magnetic path, and is generated by the current flowing through the winding 45. The magnetic field is completely confined, and leakage magnetic flux can be significantly reduced.

``Effects of the invention'' As explained in detail above, according to this invention, the space occupied is significantly reduced, the device is compact with an almost cubic shape, and can be assembled with a simple assembly process, and the insulation properties are also improved. It becomes possible to provide a compact transformer that has excellent operating characteristics and can significantly reduce leakage magnetic flux.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the configuration of a bobbin for a conventionally used small transformer, Figure 2 is a perspective view showing the shape of a closed magnetic path plate used in a conventionally used small transformer, and Figure 3 is a conventional FIG. 4 is a perspective view showing the configuration of the small transformer used. FIG. 4 is a diagram showing the structure of the core body and yoke used in an embodiment of the small transformer of this invention. FIG. 5 is an example of the small transformer of this invention. 6 is a perspective view showing the structure of a terminal board used in an embodiment of the small transformer of this invention. FIG. 7 is a perspective view showing the structure of the small transformer of this invention. , FIG. 8 is a perspective view showing how the bobbin is attached to the core body. Tp: Tapered surface, _t1 to _t6 : Terminal, 31: Core body, 32-1, 32-2: Tsuba, 33: Yoke, 3
4: Bobbin, 35-1, 35-2: Flange, 3
6-1, 36-2: Claw, 37: Terminal board, 38-
1, 38-2: Terminal mounting part, 39: Connection part, 40
-1, 40-2, 41-1, 41-2: Groove, 4
5: Winding wire.

Claims (1)

[Scope of utility model registration request] Rectangular flanges are integrally formed on both end surfaces of the core body, and one side of these flanges and the side of the core body are configured to be located on a first common plane,
A bobbin with flanges integrally formed at both ends is provided, and the bobbin covers the circumferential surface of the core body except for the side surfaces, and the flanges are brought into contact with the mutually opposing inner surfaces of the collar. A terminal board is attached to the core body, and the terminal board has a shape in which two terminal mounting parts are connected to each other at a connecting part, and the connecting part and the two terminal mounting parts are different from each other. The terminal board is configured to be positioned on a second common plane, the terminal board makes the first and second common planes face each other, and the terminal mounting part is positioned on one side of the collar, A terminal is attached to the core main body, a terminal is planted on the protruding end surface of the terminal attaching part in this attached state, a winding is wound on the bobbin and the connecting part, and the winding is attached to the terminal. are connected to each other, and a yoke is connected and disposed between the flanges.