JPH0817659A - Thin type transformer - Google Patents

Abstract

PURPOSE:To provide the title thin type transformer having excellent assembling capacity capable of miniaturizing and settling the problem of clearance when a core and a terminal base are separated as well as avoiding the coil disconnection. CONSTITUTION:Within a terminal base 1 tieing up a lead wire of a coil, a ferrite made lower side core half body 2 and a resin made terminal part 3 implanted with the terminals 4 are previously formed integrally with each other while a flat coil 5 is fixed on the core half body 2 on the lower side of this terminal base 1 so as to be covered with an upper side core half body 2'.

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 thin transformer used for an IC card size communication interface or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a transformer of this type has a coil bobbin 11 having a plurality of terminals 10 implanted therein.
The coil 12 is wound around the outer periphery of the winding body portion 11a of the coil bobbin 11, and the core halves 13 and 13 'are vertically arranged on the coil bobbin 11.
It has a configuration that incorporates each.

[0003]

As described above, in the conventional thin transformer, the core half body 13 and the coil bobbin 11 functioning as a terminal block are separate bodies, and they are integrated during assembly. However, in the case of such a configuration, it is necessary to remove the clearance between the core half body 13 and the terminal block to improve the assemblability, so that the size tends to be large, and the looseness generated at that time causes However, there is a problem that the coil may be broken.

The present invention has been proposed in view of the above, and its object is to reduce the size, prevent rattling between the core and the terminal block, and eliminate the risk of coil breakage. An object is to provide a thin transformer with good assemblability.

[0005]

According to the present invention, a terminal block 1 to which a lead wire of a coil is entangled is a resin terminal portion in which a lower core half body 2 made of ferrite and a terminal 4 are planted. 3 is integrally formed in advance, the flat coil 5 is mounted on the lower core half body 2 of the terminal block 1, and the upper core half body 2'is covered to achieve the above object. are doing.

[0006]

According to the present invention, the terminal block 1 is formed by integrally forming the terminal portion 3 in which the terminals 4 are implanted in the lower core half body 2, and the lower core half body 2 = terminal block 1 is formed. It has a function.
Therefore, the inconvenience of the conventional example in which the core and the terminal block are separately provided is eliminated. In other words, it is not necessary to consider the clearance for incorporating both, so that the size can be reduced accordingly. Also,
Since they are integrated in advance, there is no play, and there is no fear of coil breakage due to play.

[0007]

1 shows an exploded perspective view of an embodiment of the present invention. In the figure, 1 is a terminal block. The terminal block 1 is characterized in that it is composed of a lower core half 2 and terminal portions 3 provided on both sides thereof.

The core half 2 is made of a ferrite molded product, and has a plate-like portion 2a having a substantially rectangular shape as a whole, and a short columnar central leg 2 protruding from the center of the upper surface of the plate-like portion 2a.
b and both leg portions 2c are formed at both end portions of the plate-shaped portion 2a, and function as an E-shaped core.

The terminal portion 3 is provided at the other end of the plate-shaped portion 2a in a direction orthogonal to the both leg portions 2c. This terminal portion 3 is made of a molded product of insulating resin such as epoxy resin,
A plurality of terminals 4 are pre-planted. This terminal 4 is formed by appropriately cutting and bending unnecessary portions of the lead frame, and one end 4a projects upward from the upper surface 3a of the terminal portion 3,
Leader wire 5a at the beginning or end of winding of the flat coil 5
It is designed to be tied up. The other end 4b projects from the outer surface 3b of the terminal portion 3 and is bent into an L shape so as to be surface-mounted on a printed circuit board or the like.

When the terminal block 1 is manufactured, a core half body 2 made of a pre-molded ferrite and a lead frame stamped into a frame shape and having a terminal portion are attached to a predetermined position of a resin mold. Next, the lead frame and the core half body 2 may be integrally molded by resin injection to mold the terminal portion 3. In this case, as shown in FIG. 2 showing the assembled state, a recessed groove 3d is formed substantially in the center of the inner surface 3c of the terminal portion 3, and a portion 2d of the core half body is bitten into the recessed portion to improve the bondability. It is good and strong. The unnecessary portion of the lead frame frame is cut.

When assembling the thin transformer, the central leg 2 on the upper surface of the plate-like portion 2a of the core half 2 constituting the terminal block 1 is assembled.
The flat coil 5 is first mounted around b. The flat coil 5 is formed into a flat thin shape by winding an electric wire made of a heat-sealing wire in a ring shape, integrating the electric wires with each other by heat-sealing, and pressing from above and below via a jig. . The lead wire 5a of the flat coil 5 is connected to the predetermined terminal 4
It is entangled in and is securely connected by soldering.

Next, the upper core half 2'is covered.
This core half body 2'has a basic shape which is substantially the same as the lower core half body 2 and includes a central leg 2b 'and both leg portions 2c'. The difference is that the terminal portion 3 is not provided.

FIG. 2 shows an assembled state. Thus, the upper and lower core halves 2, 2'constitute a core. To integrate these, an appropriate tightening cover or an adhesive may be used.

[0014]

According to the present invention configured as described above,
Since the core half 2 and the terminal portion 3 are integrated in advance in the terminal block 1, the assembling performance of the core and the terminal block in the case where the core and the terminal block are separate bodies as in the past is Since there is no problem of clearance, there is an effect that the size can be reduced correspondingly, there is no rattling, and disconnection of the coil due to it can be prevented. Further, since the core half body 2 and the terminal portion 3 are integrated in advance, there is an effect that the assembling property of the transformer body itself is good.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is an explanatory view showing an assembled state of the present invention.

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

[Explanation of symbols] 1 terminal block 2 core half body 2'core half body 2a plate-like portion 2b central leg 2c both leg portions 2d part 3 terminal portion 3a upper surface 3b outer surface 4 terminal 4a one end 4b other end 5 flat coil 5a lead wire

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location H01F 27/28 A 9375-5E H01F 31/00 C 9375-5E F

Claims (1)

[Claims] 1. A terminal block (1) on which a lead wire of a coil is entangled, is a resin terminal part (3) in which a lower core half body (2) made of ferrite and a terminal (4) are implanted. ) Are integrally formed in advance, and the flat coil (5) is mounted on the lower core half (2) of the terminal block (1) and the upper core half (2 ') is covered. A thin transformer characterized by this.