JPH0590918U - Inductance element and LC filter using the same - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to an inductance element used in an LC filter as a noise suppression component used in electronic equipment, which solves the problems of streamlining of the process and disconnection in the winding method, thereby improving mass productivity. An object is to provide an excellent and highly reliable inductance element. [Structure] A meandering portion 24a, 24b is provided on both sides with a conductive plate, and a terminal portion 23a, is formed at one end of the meandering portion 24a, 24b.
23b is provided and the end portions of the meandering portions 24a and 24b are connected by a connecting portion 25, and the electrode 2 is provided at an intermediate portion of the connecting portion 25.
Forming 6, the manufacturing process of winding and connection can be reduced, mass productivity is excellent, reliability is high, dimensional accuracy is high, and LC can be miniaturized.
Use for filters is effective.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an inductance element as a noise suppression component used in various electronic devices and an LC filter using the inductance element.

[0002]

[Prior Art]

 Conventional inductance elements formed using a conductive plate include those shown in FIGS. 3 (a) to 3 (c). 3 (a) to 3 (c), a plate made of iron alloy or the like is punched to form a meandering portion 1 at an intermediate portion, and linear terminal portions 2 are provided at both ends of the meandering portion 1. In addition, the meandering portion 1 is formed three-dimensionally.

As conventional LC filters, those shown in FIGS. 4A to 4D have been developed. First, as shown in FIG. 4 (a), a lead wire 4 bent in a U shape is inserted into two tubular sintered ferrite cores 3, and a lead capacitor 5 is connected between the lead wires 4. It has been configured.

Next, as shown in FIG. 4B, a molding bobbin 8 having flanges 6 and 7 at both ends and in the middle is used, and leads 9 for external connection are inserted into the flanges 6 at both ends of the molding bobbin 8. Then, the lead-equipped capacitor 11 is inserted into the recess 10 of the intermediate collar 7, the winding 12 is wound around the groove between the collars 6 and 7 of the molding bobbin 8, and the lead wire of the winding 12 is connected to the lead 9 for external connection. Also, it is configured by being wound around the lead of the capacitor with lead 11 and connected by soldering.

Further, as shown in FIG. 4C, two lead drum cores 14 each having a winding 13 are prepared, and one lead capacitor 15 is also prepared. One of the leads of the capacitor 15 is connected to form an LC filter.

In the structure shown in FIG. 4D, the U-shaped ferrite core 16 is provided with four through-holes 17, and lead wires are inserted into the through-holes 17 or conductor plating is performed. Is connected by a conductor 18 to form an inductance, a chip capacitor 19 is arranged in the recess of the U-shaped ferrite core 16 and is connected to a part of the conductor 18 to form an LC filter.

The respective LC filters are generally resin-molded or casings as an exterior.

[0008]

[Problems to be solved by the device]

 The inductance element shown in FIGS. 3 (a) to 3 (c) is effective as a single inductor by molding with a resin material mixed with magnetic powder, but it was tried to be used as an LC filter. In this case, the two inductance elements must be joined together and the capacitor must also be combined, resulting in a large shape, which requires time and effort for assembly, which is a problem in terms of productivity.

In addition, in the LC filter shown in FIGS. 4A to 4D, it takes time and effort to insert the lead into the ferrite core and it is necessary to perform conductor plating, resulting in poor productivity. There is also a problem in ensuring the reliability of whether or not the plating is completely formed, and there are many points for connecting the lead wire of the winding and the connection of each lead, which is a problem in terms of productivity. In addition, there are many problems such as easy occurrence of connection failure such as disconnection at the connecting portion between the lead wire and the lead.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks and provide an inductance element having excellent productivity and high reliability, and an LC filter using the same.

[0011]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention punches a conductive plate to form meandering parts on both sides, provides a terminal part at one end of the meandering part, and connects the other end of the meandering part with a connecting part. However, an electrode portion is provided at this connecting portion.

[0012]

[Action]

 With the above configuration, even when this inductance element is used in an LC filter, the LC filter can be constructed by simply connecting a chip capacitor to the electrode portion.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings FIGS. 1 to 2A and 2B.

First, an inductance element which is the basis of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 20 is a hoop material of a conductive plate made of iron alloy, copper, copper alloy or the like, and a feed hole 21 is provided on one side of the hoop material 20. The inductance portion 22 is continuously formed by punching on the hoop material 20. The inductance portion 22 is connected to the hoop member 20 at a constant interval and is left, and terminal portions 23a and 23b, and meandering portions 24a and 24b continuously formed from the tips of the terminal portions 23a and 23b. It is configured by a connecting portion 25 that connects the ends of the meandering portions 24a and 24b, and an electrode portion 26 that protrudes toward the hoop member 20 side in the middle of the connecting portion 25.

A terminal portion 27 is also formed on the hoop material 20 corresponding to the electrode portion 26.

In the case of using as an inductance element only with such a configuration, the terminal portions 23a and 23b are cut from the hoop material 20, and the connecting portion 25 including the meandering portions 24a and 24b and the electrode portion 26 is made of a magnetic material. It can be used by molding.

When this inductance element is used as an LC filter, as shown in FIGS. 2 (a) and 2 (b), the tip portions of the electrode portion 26 and the terminal portion 27 are bent downward in an L shape. Then, the chip capacitor 28 is arranged in this portion, and after connecting by soldering or the like, the outer casing 29 is formed by resin molding or the like, and the terminal portions 23a, 23b, 27 protruding from the outer casing 29 are used as they are, as shown in FIG. The radial type LC filter shown in a) or the surface mounting type LC filter shown in FIG. 2B can be obtained by bending the terminal portions 23a, 23b and 27 along the exterior 29.

In the above embodiment, the meandering portions 24a and 24b of the inductance portion 22 have exactly the same shape, but the meandering portions 24a and 24b may have different shapes to change the coupling degree, or the meandering portion 24a. , 24b can be three-dimensionally shaped to increase the magnetic path length, thereby improving characteristics such as inductance and impedance.

Furthermore, by using a resin material containing magnetic powder instead of a mere resin material for the outer casing 29 of FIGS. 2A and 2B, the impedance characteristic of the inductance portion is improved, and the noise removal effect is improved. Moreover, the inductance value can be changed by selecting the type and content of the magnetic powder, and the trap frequency with the chip capacitor 28 can be changed.

[0020]

[Effect of the device]

 As described above, the inductance element of the present invention and the LC filter using the same can be easily used as an inductance element alone or as an LC filter, and are easy to assemble even when used as an LC filter. It is highly reliable and, in addition, it has the advantage of being able to effectively use space to achieve downsizing, and is of great practical value.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an inductance element of the present invention in a state of being punched out from a hoop material.

2A and 2B are partially transparent perspective views of an LC filter configured by using the inductance element of the present invention.

3A, 3B and 3C are perspective views showing a conventional inductance element.

4 (a), (b), (c), (d) a cross-sectional view showing a conventional LC filter, a partially cutaway front view, a cross-sectional view and a perspective view.

[Explanation of symbols]

 23a, 23b Terminal part 24a, 24b Meandering part 25 Connecting part 26 Electrode part 27 Terminal part 28 Chip capacitor 29 Exterior

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Otaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A punching out from a conductive plate to provide meandering parts on both sides,
An inductance element in which a terminal portion is provided at one end of the meandering portion, the other end of the meandering portion is connected by a connecting portion, and an electrode portion is provided at the connecting portion. 2. An LC which is provided with another terminal portion at a position corresponding to the electrode portion of the inductance element according to claim 1, a capacitor is connected between the electrode portion and the terminal portion, and which is entirely covered with an exterior.
filter. 3. The LC filter according to claim 2, wherein a resin material mixed with magnetic powder is used as the exterior.