JPH06163266A - Thin transformer - Google Patents

Abstract

PURPOSE:To realize a thin type transformer wherein manufacturing is easy, manufacturing efficiency is high, and the yield improvement and the automation are facilitated, by positioning a terminal stand and an I-type core by using a protrusion and a recess. CONSTITUTION:An E-type core 1 is arranged, and therein a terminal stand is inserted. A plurality of sheet type coils 2 are laminated by inserting a middle leg 5 of the E-type core 1 into a hole 12 of sheet type coil 2, and inserting terminals 7a into through holes 8, and the terminals 7a are electrically connected with the through holes 8. An I-type core 4 is bonded and fixed to a terminal stand 3 in the manner in which protruding parts 13 of the terminal stand 3 are made to engage with the recessed parts of the I-type core 4 and inserted into the recessed parts. As the plurality of the sheet type coil 2, a multilayered board type coil wherein a plurality of sheet type coils are previously formed in a unified body may by used. Thereby a thin type transformer is easily produced, a thin film transformer can be manufactured with high efficiency, and yield improvement and the automating are facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer and a coil device such as a choke coil used for a switching power supply, and more particularly to a transformer having a thin structure.

[0002]

2. Description of the Related Art Coil devices in which sheet-shaped coils are laminated have been widely used in recent years because they can realize thin inductors. For example, it is described in JP-A-3-283404. FIG. 6 shows an exploded perspective view of the coil device described in this publication. In this conventional example, a terminal block 6 in which six sheet coils 61 each having an insulating sheet provided with a conductor foil for forming a coil and eight terminals 62 are planted
3 and a pair of E-type ferrite cores 64. In this sheet coil 61, the end portion of the conductor foil is led out to the protruding portion 65 and the terminal hole 66 is formed. This terminal hole 66
Are inserted into the terminals of the terminal block 63 and connected. Then, it is configured by combining with a pair of E-type ferrite cores 64. As the input / output terminals of this coil device, the terminals 62 implanted in the terminal block 63 are used.

[0003]

Various thin transformers using a sheet-shaped coil have been proposed in the past. However, when productivity and automation are taken into consideration, there are problems in dimensional accuracy and positioning of each component. For example, in the case of the conventional example of FIG. 6, unless the dimensional accuracy and the positioning accuracy of each component are improved, when the E core is inserted after the sheet coils are stacked on the terminal block, it is difficult to insert or the butting is not successful. Inconvenience occurs. In view of the above, the present invention solves the above problems by a method of inserting the sheet-shaped coil into the E core and then disposing the I core by combining the E core and the I core. The I core is positioned.

[0004]

According to the present invention, there is provided a flat E-shaped core, a terminal block inserted along the outer shape of the E-shaped core and so as to cover the E-shaped core, and on the E-shaped core. A sheet-shaped coil inserted in the above, and a thin transformer in which an I-shaped core is disposed on the sheet-shaped coil, wherein the terminal block and the I-shaped core are positioned by unevenness.

[0005]

1 is a perspective view of an embodiment according to the present invention. This manufacturing process is shown in FIG. This embodiment comprises an E-shaped core 1, a terminal block 3, a plurality of sheet-shaped coils 2, and an I-shaped core 4. The E-shaped core 1 has a cylindrical middle leg 5 and a pair of outer legs 6, and the outer leg 6 is formed wider than the middle leg 5. The terminal block 3 has a hole 10 extending along the outer shape of the E-shaped core 1 and a protruding portion 1 covering the outer side 6 of the E-shaped core 1.
Have one. Further, the terminal block 3 is provided with a plurality of terminals 7, and the terminals 7 are bent and extend parallel to the mounting surface more than the portion 7a inserted into the through hole 8 of the sheet-shaped coil 2. The portion 7b is formed wide. Also, the portion 7 inserted into the through hole 8 of the terminal 7
A concave portion 9 is formed at the root portion of a. And the convex part 13 which positions the I-shaped core 4 is formed. The plurality of sheet-shaped coils 2 includes a through hole 8 and an E-shaped core 1.
It has a hole 12 to be inserted into the middle leg 5. I type core 4
Has a shape that engages with the E-shaped core 1 and has a recess 14 that engages with the protrusion 13 of the terminal block 3. In the manufacturing process of this embodiment, first, the E-shaped core 1 is arranged, and the terminal block 3 is inserted into the E-shaped core 1. Next, the plurality of sheet-shaped coils 2 are stacked by inserting the holes 12 of the sheet-shaped coil 2 into the middle leg 5 of the E-shaped core 1 and the through holes 8 into the terminals 7a, and stacking the terminals 7a and the through holes 8 with each other. Connect to each other. Then, the I-shaped core 4 is inserted by locking the convex portion 13 of the terminal block 3 and the concave portion of the I-shaped core 4 and adhering. According to this embodiment, it is sufficient to arrange the I-shaped core 4 in a state where the sheet-shaped coil 2 is all inserted in the E-shaped core 1, and the process is easier than the method of inserting the E-shaped core later. However, since the I-shaped core is displaced in the horizontal direction, the I-shaped core is positioned with the unevenness with the terminal block in the present invention. A thin transformer can be easily produced by this embodiment. Further, although a plurality of sheet-shaped coils are used in the above-mentioned embodiment, a laminated substrate type coil in which such a plurality of sheet-shaped coils are integrally formed in advance may be used.

[0006]

According to the present invention, a thin transformer can be easily manufactured, a thin transformer can be manufactured efficiently, and yield improvement and automation are easy.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a manufacturing process of one embodiment according to the present invention.

FIG. 3 is an exploded perspective view of a conventional example.

[Explanation of symbols]

 1 E-type core 2 Sheet-shaped coil 3 Terminal block 4 I-type core 5 Middle leg 6 Outer leg 7 Terminal 8 Through hole 10 Hole 11 Projection part 12 Hole 13 Convex part 14 Recessed part

Claims (1)

[Claims] 1. A flat E-shaped core, a terminal block inserted along the outer shape of the E-shaped core and so as to cover the E-shaped core, a sheet-shaped coil inserted on the E-shaped core, A thin transformer having an I-shaped core arranged thereon, wherein the terminal block and the I-shaped core are positioned by an uneven portion.