JPH0343692Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial use) The invention is designed to reduce electrical disturbance waves (hereinafter referred to as noise)
This invention relates to a noise filter element used in a circuit that effectively removes noise.

(Prior Art) For example, an LC noise prevention circuit is used as a circuit for removing noise. This is constructed by inserting a capacitor between the signal line and the ground, and also inserting an inductor in series as a noise filter element in the signal line.

By the way, when preventing noise from a large number of signal lines, for example when removing high frequency components generated from the interface circuit of a personal computer, an inductor (for example, ferrite beads) as a noise filter element is installed on each signal line. A core with a lead wire passed through it, or a ferrite core with a reciprocating winding (a relatively small core) had to be inserted in series.

(Problem to be solved by the invention) However, if an inductor is used as a noise filter element as described above, a large number of inductors will be inserted, making the noise prevention circuit large and complicated. Since the inductor is relatively small, it is difficult to handle and is not suitable for series insertion using an automatic insertion machine.

The present invention was developed in view of the above circumstances, and when a noise prevention circuit is formed using a large number of inductors, it is possible to make the noise prevention circuit compact, easy to handle, and automatically inserted. The object of the present invention is to provide a noise filter element suitable for.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the present invention has a lead wire that is inserted from one end surface of a rectangular ferrite core to the opposite end surface, and has both ends exposed. In a noise filter element in which a plurality of inductors are formed by arranging a plurality of lead wires, and both ends of the exposed lead wires serve as lead terminals for each inductor, the ferrite core has a surface through which the lead wires are inserted. It is divided into two ferrite plates, the lead wires are formed in a continuous V-shape, and a groove is cut in one of the ferrite plates to accommodate the plurality of continuous V-shaped lead wires in parallel. The continuous V-shaped lead wires are arranged and housed in the grooves such that the distance between adjacent lead wires is equal to one V-shaped valley in one lead wire and the opposite V-shaped valley connected thereto. They are arranged so that the spacing between them is narrower than that between the two plates, and in this arranged state, they are sandwiched between the other plates.

(Function) With the above configuration, a plurality of inductors can be packaged in one ferrite core.

(Example) Examples of the present invention will be described below with reference to the drawings.

Fig. 1 is a longitudinal sectional view showing the first embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a structural explanatory diagram of the main part of the ferrite core of the same example, and Fig. 4 is a diagram of the same example. It is an explanatory diagram showing an equivalent circuit. What is indicated by 1 in the figure is a ferrite core, for example, a ferrite plate 1A, and a plurality of grooves 1 through which lead wires, for example, relatively rigid plate-shaped lead wires 2 are inserted.
A grooved ferrite plate 1B provided with a is bonded. Here, the groove 1a of the plate 1B is formed in a continuous V-shape as shown in FIG. 3, and correspondingly, the lead wire 2 is also formed in a continuous V-shape to match the shape of the groove. Its effective length is becoming longer. The arrangement interval of the lead wires is such that the interval between adjacent lead wires is narrower than the interval between one V-shaped valley and the opposite V-shaped valley connected thereto in one lead wire. Note that the bonding between the two is performed using a resin adhesive or a so-called hermetic seal using a glass material. Furthermore, as mentioned above, since this ferrite core 1 has a split structure, the bonding surface is polished to minimize the decrease in effective magnetic permeability. It doesn't matter if there are some gaps. When bonding the ferrite plate 1A and the grooved ferrite plate 1B, the grooved ferrite plate 1B
The flat lead 2 is placed in the groove 1a, both ends of which are exposed from the groove 1a, and then the ferrite plate 1A is bonded onto the grooved ferrite plate 1B. Although appropriate insulation treatment is applied between the flat lead 2 and both ferrite plates 1A and 1B, both ferrite plates 1
By glazing the surfaces of A and 1B with a glassy substance, it is possible to improve the insulation resistance of the ferrite surface, which originally has a low resistivity, and also to improve the moisture resistance. In this way, by inserting and disposing a plurality of flat leads 2 from one end surface of the ferrite core 1 to the other end surface opposite thereto, with both ends exposed,
Connect both ends of the exposed lead wire 2 to lead terminals 2a.
A plurality of inductors 3 are formed to constitute the noise filter element of this embodiment.

Note that the above-mentioned embodiment is merely an example, and various modifications can be made within the scope of the gist of the present invention. For example, the ferrite plate can have a vertically symmetrical divided structure by providing grooves on its opposing surfaces. Further, the lead wire is not limited to a flat lead, and a normal lead wire may be used.

In the noise filter element constructed as described above, a plurality of inductors 3 are formed on one ferrite core 1, and the structure is made as if the plurality of inductors 3 were packaged in an orderly manner, making it easy to handle. , and can be incorporated into a circuit using an automatic insertion machine, and the noise prevention circuit can also be made more compact. Furthermore, since the lead wires are arranged in a continuous V-shape, the effective length can be increased and the lead wires can be prevented from coming off.

[Effects of the invention] As is clear from the above explanation, the noise filter element of the invention can make the noise prevention circuit more compact, and is easy to handle and can be inserted into the circuit using an automatic insertion machine. It has excellent effects such as being able to be incorporated.

In particular, the spacing between parallel lead wires is narrower than the spacing between one V-shaped valley and the opposite V-shaped valley of the V-shaped portion (that is, each time the V-shaped portions of adjacent lead wires intertwine). This allows a large number of lead wires to be packed together in a ferrite block with a limited area (integrated The unique effect of this is that it is possible to improve the degree of

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention;
The figure is a side view of the same example, FIG. 3 is a structural explanatory diagram of a main part of the ferrite core of the same example, and FIG. 4 is an explanatory diagram showing an equivalent circuit of the same example. 1... Ferrite core, 2... Lead wire, 2a
...Lead terminal, 3, 4...Inductor.

Claims (1)

[Claims for Utility Model Registration] A plurality of inductors are formed by arranging a plurality of lead wires that are inserted from one end surface of a rectangular ferrite core to the opposite end surface and have both ends exposed. In a noise filter element in which both ends of the lead wires are used as lead terminals of each inductor, the ferrite core is divided into two ferrite plates at the surface through which the lead wires are inserted, and the lead wires are arranged in a continuous V-shape. a groove is cut in one of the ferrite plates to accommodate a plurality of the continuous V-shaped lead wires in parallel, and the continuous V-shaped lead wires accommodated in the groove include: The lead wires are arranged so that the distance between adjacent lead wires is narrower than the distance between one V-shaped valley in one lead wire and the opposite V-shaped valley connected thereto, and in this way. A noise filter element, characterized in that the element is sandwiched between the other ferrite plates in an arrayed state.