JPH0539608Y2 - - Google Patents

Description

[Detailed explanation of the idea] Background of the idea Technical field The present invention relates to an inductance element.

Prior art and its problems The inductance element that has been commonly used in the past has a structure in which a core is attached to a wire wound around a pin-equipped bobbin that can be inserted into and attached to a printed circuit board. be. This type of inductance element using a bobbin with a pin is relatively large.

However, recently, small inductance elements have come to be used in various communication devices, electronic devices, etc., and there is a demand for further miniaturization.

Such a small inductance element is not suitable for manual work, unlike the above-mentioned bobbin with a pin.

For this reason, the present inventors have previously proposed and filed an application for an inductance element suitable for automatic attachment to a printed circuit board or the like.

In other words, a bobbin with a terminal is used instead of a conventional bobbin with a pin, and this bobbin with a terminal has flanges at both ends of the cylindrical part of the bobbin, and both flanges have a flange on a plane parallel to the axis of the cylindrical part. A chip terminal is provided in this bridge part, and this chip terminal has a base part buried in the bridge part, a bent part bent diagonally downward from this base part, and this bent part. It has a tip mounting portion formed at the tip substantially parallel to the axis of the cylindrical portion.

In addition to this, we also proposed a guide wall to reduce misalignment at the joint when inserting and installing the core.
No. 194318).

However, the current challenge is to develop an inductance element suitable for further downsizing.

Purpose of the invention The purpose of the invention is to provide an inductance element that is compact, has excellent reliability, workability, and durability, and has a simplified manufacturing process.

DISCLOSURE OF THE INVENTION These objects are achieved by the present invention described below.

In other words, the present invention includes a substantially flat first core;
A resin terminal block provided in a part of the core and having a terminal board embedded therein, and a cylindrical resin bobbin having flanges at both ends and connected to the terminal block, the core and A terminal plate, a terminal block, and a bobbin are formed by integral molding, a winding is applied to this bobbin, and the winding is connected to the terminal plate, and the protrusion of a cup-shaped second core having a protrusion in the center is This is an inductance element characterized by being inserted into a bobbin.

Specific Structure of the Invention The present invention will be described below with reference to FIGS. 1, 2, and 3.

In the inductance element of the present invention, the first
As shown in the figure, a first core 1, a terminal block 2, and a bobbin 3 are integrally molded.

The first core 1 has a flat plate shape and is made of ferrite. The terminal block 2 is made of resin, and a terminal board 4 is embedded therein.
Although the number of terminal plates 4 is six in the illustrated example, it may be determined as appropriate depending on the purpose of the inductance element used. The bobbin 3 has a cylindrical shape, a rectangular shape, or the like, has flanges 51 and 52 at both ends, is made of resin, and has a predetermined winding 6 applied thereto.

In the illustrated example, notches are provided at both ends of the rectangular flat first core 1, and the prismatic terminal blocks 2, 2 are inserted and integrated into the notches.
In addition, the bobbin 3, which is usually made of the same material as both terminal blocks 2, 2, has a lower end surface of one of the flanges 52.
It is in contact with the upper end surface of the first core 1 and is integrated so that this collar 52 is connected to both terminal blocks 2, 2.

The terminal board 4 is buried so that the tangled portion is exposed from the upper end surface of the terminal block 2 and the base connection portion is exposed from the lower end surface of the terminal block 2.

In such a case, in the processing process, the first core 1
The terminal board 4 is installed at a predetermined position, and a mold corresponding to the terminal block 2 and bobbin 3 prepared in advance is filled with resin to integrally mold the core 1, the terminal block 2, and the bobbin 3.

This fixes the bobbin 3 on the first core 1 and the terminal block 2, resulting in a stable structure. In this case, any resin may be used. By doing so, the processing process, especially the integral molding, becomes extremely simple.

Furthermore, since the terminal board can be manufactured using a lead frame, it is possible to perform unmanned integral molding, and the entire assembly process can be unmanned.

In the present invention, after a predetermined winding 6 is applied to the bobbin 3 integrally molded in this way, a cup-shaped second core as shown in FIGS. 2 and 3 is placed inside the bobbin 3. By inserting the protrusion 71 provided at the center of 7, the integrally molded part and the second core 7 are integrated.

Note that when winding is performed using an automatic NC-controlled winding machine, it is possible to wind the wire and connect the terminals at the same time, which is efficient.

The cup-shaped second core 7 is made of ferrite like the first core 1, and preferably has a shape that locks onto the above-mentioned integral molding.

That is, at the portion where the second core 7 and the first core 1 contact, the inner dimension of the second core 7 and the first core 1 are different from each other.
The outer dimensions of the cores 1 are the same, and the shapes are such that they interlock with each other.

In the illustrated example, the second core 7 has a housing shape, contacts the first core 1 on its side surface, and has a part cut out in the portion that contacts the terminal block 2.

By doing so, positioning becomes easy. Therefore, if the above conditions are satisfied,
The outer shape of the second core 7 is not limited to the rectangular shape illustrated.

Since the protrusion 71 is inserted into the bobbin 3, it is sufficient that the protrusion 71 corresponds to the shape of the inside of the bobbin.

The protrusion 71 of the cup-shaped second core 7 and the flat plate-shaped first core 1 can be used in close contact with each other, or with a gap provided between them. It is. When using the bobbin with a gap, it is sufficient to use a mold to fill the inside of the bobbin with resin for the required length of the gap during the above-mentioned integral molding.

By doing so, any gap length can be easily and accurately set depending on the application.

Specific effects of the invention According to the invention, the first core has a substantially flat plate shape, a resin terminal block with a terminal board embedded in a part of the core, and a cylinder having flanges at both ends. A shaped resin bobbin, the core and the terminal block are integrally molded, a winding is applied to this bobbin, and a protrusion of a cup-shaped second core having a protrusion in the center is inserted into the bobbin. It is compact and has excellent reliability, workability, and durability.
Moreover, an inductance element with simplified processing steps can be obtained. Also, winding work is easy.

Since the inductance element of the present invention has the above advantages, it can be applied to various communication devices, electronic devices, etc. as a so-called on-board type. In other words, it is possible to arrange electronic components on a backing tape at regular intervals to form a series of electronic components, or to arrange them in a fixed posture in a cylindrical magazine and supply them to an automatic electronic component mounting device.
It is extremely convenient for automatic attachment to IC boards or printed circuit boards of electronic devices.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the inductance element of the present invention before a cup-shaped second core is attached. FIG. 2 is a perspective view of a second core that constitutes one embodiment of the inductance element of the present invention. FIG. 3 is a perspective view of the second core shown in FIG. 2, viewed from below. Explanation of symbols: 1...First core, 2...Terminal block, 3...Bobbin, 4...Terminal board, 51, 52...
... Tsuba, 6... Winding wire, 7... Second core, 71...
Protrusion.

Claims (1)

[Claims for Utility Model Registration] A first core having a substantially flat plate shape, a resin terminal block provided in a part of the core and having a terminal board embedded therein;
Furthermore, it has flanges at both ends and a cylindrical resin bobbin connected to the terminal block, the core, the terminal plate, the terminal block, and the bobbin are formed by integral molding, and the bobbin is wound. An inductance element, characterized in that a winding is connected to a terminal plate and a protrusion of a cup-shaped second core having a protrusion in the center is inserted into the bobbin and integrated.