JPH08172017A - Thin transformer - Google Patents

Abstract

PURPOSE: To obtain a thin film which is made to be compact by reducing the height by interposing a thin insulating film between the upper surface of a flat coil and the internal surface of the upper half body of a ferrite core. CONSTITUTION: After an insulating film 16 is put on a flat coil 11 while the window of the film 16 is aligned with the hollow section of the winding drum 8 of a terminal block 6, the upper half body 12 of a ferrite core is put on the lower half body 1 of the ferrite core by bringing both side legs 3 and 14 of the half bodies 1 and 12 into contact with each other. At the time of joining the half bodies 1 and 12 together, the center leg 15 of the upper half body 12 is inserted into the winding drum 8 of the terminal block 6 and the end face of the leg 15 comes into contact with the end face of the center leg 4 of the lower half body 1 and, at the same time, the platy section 13 of the half body 12 comes into contact with the upper end of the drum 8. Finally, the half bodies 12 and 1 are fixed to each other by applying an adhesive 18 to the recessed sections 5 of the legs 3 and 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mounting type ultra-thin transformer used for an IC card size communication interface or the like.

[0002]

2. Description of the Related Art An example of this type of transformer is shown in FIG.
As shown in FIG. 3, a winding drum 21 having a flange 20 on the upper end is provided on the terminal block 22, and a coil 23 is attached to the winding drum 21.
The lower leg core half 24 of the lower ferrite core half 24 is fitted into the winding drum 21 to incorporate the lower ferrite core half 24 into the terminal block 22, and the center leg 27 of the upper ferrite core half 26 is attached to the winding drum 21. It is known that the upper and lower ferrite core halves 26 and 24 are integrated by inserting the above.

[0003]

However, since this thin transformer is provided with the flange 20 at the upper end of the winding drum 21, the height thereof is increased by that much, and there is a problem that the compactness is restricted. .

In view of such circumstances, it is an object of the present invention to provide a thin transformer which has a reduced height and is compact.

[0005]

According to the present invention for solving the above-mentioned problems, a winding cylinder 8 having a rectangular tube shape is provided at the center of a terminal block 6, and the winding cylinder 8 is provided with a lower ferrite core half body 1. The lower leg core half 1 is fitted into the terminal block 6 by fitting the center leg 4, the center leg 15 of the upper ferrite core half 12 is fitted in the winding drum 8, and the upper ferrite core half 12 is attached to the upper end of the winding drum 8. The flat coil 13 is brought into contact with the upper and lower ferrite core halves 12 and 1 to be integrated with each other, and a thin insulating film 16 is interposed between the upper and lower ferrite core halves 12 and 1 to form the flat coil 11. It is characterized in that it is wound around the winding drum 8.

[0006]

In the thin transformer of the present invention, a thin insulating film 16 is interposed so as to insulate the upper ferrite core half body 12 from the flat coil 11, and a thick upper flange is omitted, so-called one side flange type. And the height is reduced.

[0007]

FIG. 4 shows an exploded perspective view of a thin transformer of the present invention. In the figure, reference numeral 1 denotes a lower ferrite core half body having a substantially E-shaped cross section, which has both end legs 3 and 3 extending upward from both ends of the flat plate portion 2 and a central leg 4 protruding in the center of the flat plate portion 2. It has and. Further, two recesses 5 are formed on both sides of the outer side surfaces of the both end legs 3 and 3.

Reference numeral 6 denotes a terminal block formed of epoxy resin or the like and having a substantially rectangular shape. The thick portions 6b are formed at both ends of the lower portion of the terminal block.
A plurality of terminals 7 are planted in each. These terminals 7 are bent at their tips into an L shape so that they can be surface-mounted on a printed circuit board. The terminal block 6 is provided with a rectangular tube-shaped winding drum 8 on the upper surface side of the central portion. In addition, 6c is a leader line drawing groove. In addition, on the lower surface 6a of the terminal block 6, as shown in FIG.
As shown in FIG. 3, a recessed stepped notch 9 having a shape corresponding to the flat plate portion 2 of the lower ferrite core half 1 is formed, and a recess 10 is formed adjacent to the notch 9 on the thick portion 6b side. It is formed in three places. That is, the lower surface of one thick portion 6b (left side in the drawing) projects inward in a V shape, and one recess 10 is formed at the center of the tip.
Further, the lower surface of the other thick portion 6b (right side in the figure) is rectangular, and recesses 10 are formed on both sides thereof.

Referring again to FIG. 4, reference numeral 11 denotes a flat coil which is mounted on the outer circumference of the winding drum 8 of the terminal block 6 and which is formed by winding a self-bonding electric wire in a ring shape and thermally or solvent bonding each electric wire to each other. It is integrated and flattened by pressing it from above and below with a jig.

Reference numeral 12 denotes an upper ferrite core half body having the same shape as the lower ferrite core half body 1, and has both end legs 14 and 14 extending downward from both ends of the flat plate portion 13 and a central leg protruding to the center of the flat plate portion 2. And 15. Further, two concave portions 5 are formed on the outer side surfaces of the both end legs 14 and 14, respectively. Reference numeral 16 is a thin insulating film interposed between the flat coil 11 and the upper ferrite core half 12 and has a substantially rectangular shape, and a window 17 is formed in the center thereof.

Next, a method of assembling this thin transformer will be described. A flat coil 11 is provided on the outer circumference of the winding drum 8 of the terminal block 6.
And attach the lead wire (not shown) to the lead wire lead groove 6c.
To each terminal 7 of the terminal block 6 via.

Further, the center leg 4 of the lower ferrite core half body 1 formed in a shape substantially corresponding to the hollow portion of the winding drum 8 of the terminal block 6 is fitted, and the lower ferrite core half is inserted in the notch 9 of the terminal block 6. After accommodating the flat plate portion 2 of the body 1, an adhesive agent (not shown) is applied in each recess 10 of the terminal block 6 to fix the terminal block 6 and the lower ferrite core half body 1 to each other. At this time, since the depth of the notch 9 of the terminal block 6 is the same as the thickness of the flat plate portion 2 of the lower ferrite core half body 1, the lower surface 2a of the flat plate portion 2 of the lower ferrite core half body 1 is formed.
Is substantially flush with the lower surface 6a of the terminal block 6, that is, the lower surface of the thick portion 6b, as shown in FIG.

Further, the insulating film 16 is placed on the flat coil 11 while positioning the window 17 of the insulating film 16 in the hollow portion of the winding drum 8 of the terminal block 6, and then the lower ferrite core half body 1 is covered with the upper ferrite core. The half body 12 is overlapped with its both legs 3, 14 in contact with each other. At this time,
The center leg 15 of the upper ferrite core half body 12 is fitted into the winding body 8 of the terminal block 6, and the end surface of the lower ferrite core half body 1 is
The flat plate portion 13 of the upper ferrite core half body 12 abuts on the upper end of the winding drum 8 while abutting on the end face of the central leg 4 of the (see FIG. 1). Finally, as shown in FIG.
Apply adhesive 18 to each recess 5 of
The lower ferrite core halves 12, 1 may be fixed to each other.

[0014]

According to the present invention, the thin insulating film 16 is interposed between the upper surface of the flat coil 11 and the inner surface of the upper ferrite core half 12 in place of the thick upper flange. Therefore, the height dimension can be reduced, and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a view showing a thin transformer of the present invention and is a cross-sectional view taken along the line AA shown in FIG.

FIG. 2 is a perspective view of the thin transformer.

FIG. 3 is a perspective view of an assembled state of the lower ferrite core half body with respect to the terminal block in the same thin transformer as seen from the back side.

FIG. 4 is an exploded perspective view of the thin transformer.

FIG. 5 is a vertical cross-sectional view of a conventional thin transformer.

[Explanation of symbols]

 1 Lower Ferrite Core Half 2 Flat Plate 3 Both Ends 4 Center Leg 5 Recess 6 Terminal Block 7 Terminal 8 Winding Body 9 Notch 10 Recess 11 Flat Coil 12 Upper Ferrite Core Half 13 Flat Plate 14 Both Ends 15 Center Leg 16 Insulation Film 17 Window 18 Adhesive

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Osamu Watanabe 5-30 Chiyoda, Sakado City, Saitama Prefecture Tamura Corporation Saitama Plant

Claims (1)

[Claims] 1. A rectangular tube-shaped winding drum (8) is provided at the center of a terminal block (6), and a center leg (4) of a lower ferrite core half body (1) is fitted into the winding drum (8). Then, the lower ferrite core half body (1) is incorporated into the terminal block (6), and the winding drum (8) is attached to the central leg (1) of the upper ferrite core half body (12).
5) is fitted and the flat plate part (13) of the upper ferrite core half body (12) is brought into contact with the upper end of the winding drum (8) to integrate the upper and lower ferrite core half bodies (12, 1), A thin transformer characterized in that a flat coil (11) is wound around a winding drum (8) by interposing a thin insulating film (16) between the ferrite core half body (12) and a flat plate portion (13). .