JP2003332137A - Low profile transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low profile transformer for contriving thinning. <P>SOLUTION: The low profile transformer comprises: a core main body 1 having both-end core part 3 provided integrally on a center core part 2 winding a core and both ends of the center core part 2; a pair of bobbins 4 having a thin part 6 in the inside and a thick part 7 in the outside, forming a fitting part 10 opened upward in the thin part 6 and coupled integrally on the core main body 1 by fitting the both-end core part 3 of the core main body 1 to the fitting part 10; an outside core part 16 sandwiching the center core part 2, provided on both side parts of the core main body 1 and fixed on the pair of the bobbins 4 on both end faces; and a terminal 11 inserted in the pair of the bobbins 4 and connecting the terminal of the coil. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-profile transformer used in, for example, optical equipment such as cameras and small electronic equipment.

[0002]

2. Description of the Related Art Small transformers used in optical devices such as cameras and small electronic devices are required to be compact and thin because they are stored in a limited narrow space of the optical devices and small electronic devices. ing.

For example, Japanese Patent Publication No. 6-48651 discloses
It was proposed to meet the above requirements,
It is a transformer with a core mounted on top of a bobbin.
The core includes a main core having shunt cores at both ends of a central core around which the coil is wound, an outer core connecting the shunt cores on both sides of the main core, and a main core of the main core. It is composed of a plurality of terminal pin fixing plates each having a fitting portion fitted to the shunt core portion and a notch portion for guiding the central core portion to substantially the center.

The terminal pin fixing plate is fitted and fixed to the shunt core portion of the main core, the coil is wound around the central core portion, and then the outer core is fixed to the shunt core portion.

[0005]

However, the small transformer constructed as described above has a structure in which the core is mounted on the bobbin, and the dimension obtained by adding the height dimension of the bobbin and the height dimension of the core is the transformer. It is high. Therefore, even if the heights of the bobbin and the core are made as small as possible, there is a limit to thinning because of the vertically stacked structure.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a low-profile transformer in which the overlapping portion of the bobbin and the core has a thin structure and can be made thin. To do.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a central core part around which a coil is wound and both ends integrally provided at both ends of the central core part. A core main body having a core portion, a thin-walled portion on the inner side, and a thick-walled portion on the outer side, and a fitting portion that opens upward is formed in the thin-walled portion, and both end core portions of the core main body serve as the fitting portion. A pair of bobbins that are integrally connected to the core main body by being fitted, and outer sides provided on both sides of the core main body with the central core portion sandwiched therebetween, and both end surfaces being fixed to the pair of bobbins. A low-profile transformer, comprising: a core portion; and a terminal that is inserted into the pair of bobbins and that is connected to an end of the coil.

According to a second aspect of the present invention, the fitting portion provided on the bobbin according to the first aspect has a pair of projecting pieces projecting upward, and the pair of projecting pieces connect both end portions of the central core portion. It is characterized by being sandwiched.

A third aspect of the present invention is characterized in that the bottom of the bobbin according to the first aspect has a coil insertion groove through which a terminal of a coil is inserted and which is connected to a terminal.

According to the above-mentioned structure, when the both end core portions of the core are positioned with respect to the fitting portions of the pair of bobbins from above and the both end core portions are pushed into the fitting portions, the both end core portions are fitted to each other. Is fitted to. Then, both ends of the central core portion are sandwiched between a pair of projecting pieces, the both end core portions are placed on the thin portion of the bobbin main body, and the pair of bobbins are integrally coupled to the core main body. . Therefore, the height of the core and the bobbin are substantially the same, the height dimension in the assembled state is small, and the thickness can be reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment, and FIG.
Is a perspective view of the low-profile transformer, FIG. 2 is an exploded perspective view of the low-profile transformer, FIG. 3 (a) is a plan view mainly of the core, (b) is a bottom view of the bobbin, and (c) is a side view. FIG. 3D is a plan view showing a part of the assembled state.

As shown in FIGS. 1 to 3, the core main body 1 is
For example, a flat rectangular central core portion 2 formed of a material having a low electric insulation property such as a manganese-based ferrite material and around which a coil is wound, and integrally provided at both ends of the central core portion 2 in a direction perpendicular to each other. And both ends of the prismatic prism 3 are formed.

The pair of bobbins 4 provided at both ends of the core main body 1 are made of a synthetic resin material having a high electric insulation property, and the bobbin main body 5 is formed in a prism shape longer than the both end core portions 3. A thin portion 6 having a low height direction is provided inside one side portion along the longitudinal direction of the bobbin main body 5, and a thick portion 7 having a high height direction is provided outside the other side portion. .

At the center of the thin portion 6 in the longitudinal direction, a mounting portion 8 having a width substantially equal to the length of the core portions 3 at both ends and protruding by several mm is provided.
And a pair of projecting pieces 9, 9 projecting upward are provided at both ends of the mounting portion 8. A substantially U-shaped fitting portion 10 that opens upward is formed between the side surface of the thick portion 7 and the projecting pieces 9, 9. The interval L between the pair of projecting pieces 9 and 9 is substantially equal to the width W of the central core portion 2 so that the central core portion 2 can be fitted between the projecting pieces 9 and 9.

Further, a plurality of them are provided on the outer surface of the thick portion 7 of the bobbin main body 5, and in the present embodiment, 3 are provided on one side of the bobbin main body 5.
6 terminals 11 in total are provided in an inserted state. The terminals 11 have the same shape, and are, for example, a copper plate, phosphor bronze, etc. punched into a substantially U shape.

The terminal 11 has a terminal main body portion 12, a winding processing terminal portion 13 protruding laterally from the terminal main body portion 12, and a laterally protruding parallel processing terminal portion 13. The board mounting terminal portion 14 has a large protrusion amount.

The terminal body 12 of the terminal 11 is inserted into the bobbin body 5, the winding processing terminal portion 13 is located on the outer surface of the bobbin body 5, and the board mounting terminal portion 14 is folded along the bottom surface from the outer surface. It's tuned. Further, on the bottom surface of the bobbin main body 5, coil insertion grooves 15 are provided in the respective winding processing terminal portions 13 so as to cross the bobbin main body 5 in a corresponding number.

Further, outer core portions 16 whose both end surfaces are fixed to the pair of bobbins 4 are provided on both sides of the central core portion 2 of the core main body 1 so as to sandwich the central core portion 2. This outer core 1
6 is made of the same material as the core main body 1 and is formed in a prismatic shape.

Next, an example of the order of assembling the low-profile transformer having the above-described structure will be described. When the both-end core portions 3 of the core main body 1 are positioned from above the fitting portions 10 of the pair of bobbins 4 and the both-end core portions 3 are pushed into the fitting portions 10, the both-end core portions 3 become the fitting portions 10. Mated.

At this time, both ends of the central core portion 2 are sandwiched between the pair of projecting pieces 9 and 9, and the both end core portions 3 are mounted on the mounting portion 8 provided on the thin portion 6 of the bobbin main body 5. The core main body 1 and the pair of bobbins 4 are integrally connected to each other.

In this state, the bobbin 4 is chucked,
Each coil 17 is wound around the central core portion 2, but the core main body 1
Is formed of a material having low electric insulation, such as a manganese-based ferrite material, so that each coil 17 is wound by a winding machine or manually by winding the insulating paper and the insulating tape 18 around the central core portion 2. Wind up.

After winding the coil 17, the insulating paper and the insulating tape 18 are wound around the outside of the coil 17. Next, the outer core portion 16 is positioned between the bobbins 4 and 4 so as to sandwich the coil 17, and both ends of the outer core portion 16 are adhesively fixed to the bobbin main body 5.

Finally, the winding start terminal 17 of each coil 17
a and the end of winding 17a are inserted into the coil insertion groove 15 provided on the bottom surface of the bobbin main body 5, and the winding processing terminal portion 13 is tangled on the outside of the bobbin main body 5 for soldering or arc welding to complete To do.

Further, the terminal 17a of the coil 17 is entangled with the winding processing terminal portion 13 and soldered to the substrate mounting terminal portion 1
Although 4 is reflow-soldered to the board, the board mounting terminal portion 14 is bent from the outer surface of the bobbin main body 5 along the bottom surface. Therefore, the board mounting terminal portion 14 is in a positional relationship apart from the winding processing terminal portion 13 and does not exert a thermal influence on the winding processing terminal portion 13 during reflow soldering. Further, when the terminal 17a of the coil 17 is twisted with respect to the winding processing terminal portion 13 by the automatic winding machine, the board mounting terminal portion 14 does not get in the way and the workability of the twisting operation can be improved.

In the above-described embodiment, the core main body is formed of a material having a low electric insulation such as a manganese-based ferrite material, but the core main body material is not limited.

[0027]

As described above, according to the present invention, when the both-end core portions of the core are pushed into the fitting portions of the pair of bobbins, the both-end core portions fit into the fitting portions. Both ends of the central core portion are sandwiched between a pair of protruding pieces,
The both-end core portions are placed on the thin portion of the bobbin body, and the pair of bobbins are integrally coupled to the core main body. Therefore, the height of the core and the bobbin are almost the same,
The height dimension in the assembled state is small, and the thickness can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a low-profile transformer showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the low-profile transformer of the same embodiment.

FIG. 3 shows the same embodiment, (a) is a plan view of the core, (b) is a bottom view of the bobbin, (c) is a side view, (d).
FIG. 4 is a plan view showing a part of an assembled state.

[Explanation of symbols]

1 ... Core 2 ... Central core 3 ... Both ends core 4 ... Bobbin 6 ... Thin wall 7 ... Thick part 9 ... protruding piece 10 ... Fitting part 11 ... Terminal 16 ... Outer core part 17 ... Coil

Claims (3)

[Claims] 1. A core main body having a central core part around which a coil is wound and both end core parts integrally provided at both ends of the central core part; a thin part inside and a thick part outside. A pair of bobbins integrally formed with the core main body by forming a fitting portion that opens upward in the thin portion, and the both-end core portions of the core main body being fitted into the fitting portion, Outer core portions provided on both sides of the core main body with the central core portion sandwiched therebetween, both end surfaces of which are fixed to the pair of bobbins, and terminals to be inserted into the pair of bobbins and to which terminals of the coils are connected. And a low-profile transformer. 2. The fitting portion provided on the bobbin has a pair of projecting pieces projecting upward, and the pair of projecting pieces sandwiches both ends of the central core section. The low-profile transformer according to claim 1. 3. The low profile transformer according to claim 1, wherein the bottom of the bobbin has a coil insertion groove through which a terminal of a coil is inserted and which is connected to the terminal.