JPH04105509U - Multiple chip type LC filter - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] A filter can be easily constructed with only the necessary filter elements according to the number of required circuits, and even if one of the multiple filter elements is defective, the filter for that defective filter can be easily constructed. To provide a multi-chip LC filter having a structure in which only elements can be replaced with non-defective ones. [Structure] A coil in which a copper wire is wound around a ferrite core and a part of the lead terminal that connects the terminal of this coil are molded with exterior resin, and a chip type capacitor is led into the recess on the bottom surface of the molded filter element 17. The filter element 17 is connected together with the terminal, and the filter element 17 is inserted and fitted into the case 18 to form a filter. With this configuration, a filter can be constructed by inserting the necessary number of filter elements 17 into a simple case 18. Also, characteristics of individual filter elements can be inspected before constructing the filter.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a filter for signal circuits such as video tape recorders and television receivers. The present invention relates to a multi-chip LC filter used as a multi-chip LC filter.

0002

[Conventional technology]

As an example of a conventional multiple type LC filter, Japanese Utility Model Application Publication No. 64-37126 As shown in the report, multiple elements are fitted in a box shape with a case from the top and bottom. Although it is stored in a chip type, it is not miniaturized. Also, an example of multiple chip type There are examples where the exterior resin is integrally molded.

0003 A conventional multi-chip LC filter will be explained below with reference to the drawings. . Figures 4, 5, and 6 are cross-sectional and perspective views of conventional multi-chip LC filters. It is a circuit diagram.

0004 In Figure 4, 1 is a chip-type capacitor, and 2 is a coil constructed by winding copper wire. , 3 is a ferrite core with flanges formed on both ends, 4 is a connection with the copper wire of coil 2, and Lead terminal for connection with chip type capacitor 1 and external connection, 5 is exterior resin , 6 is a recess provided on the lower surface of the exterior resin 5 for inserting the chip type capacitor 1. be. FIG. 5 is a perspective view seen from below.

[0005] FIG. 6 is an internal circuit diagram of FIG. 5, in which three filter elements a, b, and c are built-in. To explain the multi-chip LC filter configured as above, the coil Lead 2 is connected to lead terminal 4 with copper wire wound around it so as to have a predetermined inductance. has been done. The lead terminal 4 protrudes from the facing side of the exterior resin 5 and is attached to the exterior resin 5. It is led to a recess 6 provided on the lower surface. A chip capacitor 1 is placed in the recess 6. A filter circuit is formed by being inserted and electrically connected to the lead terminal 4. difference Furthermore, the coil 2, lead terminal 4, and chip capacitor 1 are one filter element. The three filter elements are further integrated with the exterior resin 5. A multi-chip filter is constructed.

[0006]

[Problem that the idea aims to solve]

However, in the above configuration, depending on the number of filter elements required, the exterior It is also necessary to make a large number of molds for resin 5. Exterior resin 5, which temporarily accommodates many filter elements If one type of filter is provided, there will be many unnecessary parts if fewer filter elements are required. There is also a wasted area in the bottom area. Also, in one molded body, built-in Even if one filter element among multiple filter elements is defective, the entire filter element is defective. There was a problem that.

[0007] This invention solves the above-mentioned conventional problems. Filters can be easily configured with only filter elements, and can also be configured with multiple filter elements. Even if one of the filter elements is defective, only that defective filter element can be replaced with a good one. The present invention provides a multi-chip LC filter.

[0008]

[Means to solve the problem]

To achieve this purpose, the multi-chip LC filter of the present invention has flanges on both ends. A coil with a wire wound around a ferrite core and a lead that connects the coil lead wire. A terminal is provided, a portion of the coil and lead terminal are molded with an exterior resin, and the exterior One in which a chip capacitor is inserted into a recess made in the resin and connected to a lead terminal. The necessary filter is constructed by arranging multiple filter elements and inserting them into the case. .

[0009]

[Effect]

With this configuration, the required size of the filter can be adjusted according to the number of filter elements required for the filter. You can create a filter by inserting it into a space. Furthermore, the filter element If a defective filter element is found inside, replace and insert only that filter element. It is also possible to re-enter.

0010

【Example】

An embodiment of the present invention will be described below with reference to the drawings.

[0011] Figures 1 to 3 show the multi-chip LC filter of the present invention, and Figure 1 shows one chip type LC filter. In the cross-sectional view of the filter element, 11 is a chip capacitor, 12 is a copper wire wound. The coil, 13, is a ferrite core with flanges at both ends, and 14 is the terminal of the coil 12. Lead terminal 1 for connection, connection to chip type capacitor 11, and connection to the outside 5 is an exterior resin in which part of the coil 12 and lead terminal 14 are molded with resin; 16 is an exterior resin molded with resin; A recess provided on the lower surface of the exterior resin 15 for inserting the chip capacitor 11; 7 is a filter element in which a coil 12 is molded with exterior resin 15, and FIG. 2 is a filter element. A perspective view when the child 17 is inserted into the case 18, and FIG. 3 is a partially sectional side view of the present invention. Ru.

0012 The operation of the multi-chip LC filter configured as above is explained below. explain.

[0013] First, a copper wire is wound around a ferrite core 13 to obtain a coil 12. coil 12 The terminal of is connected to the lead terminal 14. Coil 12 and lead terminal with exterior resin 15 A part of the lead terminal 14 is molded, and the lead terminal 14 protruding outside the exterior resin 15 is attached to the exterior resin 15. The oil is guided to a recess 16 provided on the lower surface of the oil 15. A chip type capacitor is placed in the recess 16. The filter element 17 is obtained by inserting the sensor 11 and connecting it to the lead terminal 14. child In case 1, the number of filter elements 17 is the same as the number of element circuits necessary to configure the filter. 8 to form a filter as a whole. Case 18 is a filter element. 17, and there are no restrictions on the material and shape.

[0014]

[Effect of the idea]

As described above, according to the present invention, just by inserting a filter element into a simple case, Filters can be configured. Also, since each filter element is inserted independently, Even if one of the filter elements in the filter is defective, it can be replaced with a good one and the filter will function properly. can be made into good quality products.

[Brief explanation of drawings]

[Fig. 1] A cross-sectional view of a coil element in an embodiment of the multi-chip LC filter of the present invention.

[Figure 2] A perspective view of the present invention in the process of being manufactured, with the coil element being inserted into the case.

[Figure 3] Partial cross-sectional side view of the present invention

[Figure 4] Cross-sectional view of a conventional chip-type LC filter

[Figure 5] Perspective view from the bottom of Figure 4

[Figure 6] Circuit diagram of internal elements in Figure 5

[Explanation of symbols]

11 Chip type capacitor 12 Coil 13 Ferrite core 14 Lead terminal 15 Exterior resin 16 Recess 17 Filter element 18 Case

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Hisayo Miyoshi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Inside Sangyo Co., Ltd. (72) Creator Yasuhiro Yonezawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Inside Sangyo Co., Ltd. (72) Creator Akira Hamano 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Inside Sangyo Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A coil formed by winding a wire around a ferrite core having flanges at both ends, and a lead terminal for connecting the ends of the coil, a part of the coil and the lead terminal being molded with an exterior resin, and a part of the coil and the lead terminal being molded with an exterior resin. This is a multi-chip LC filter in which a plurality of filter elements are inserted into a case and fixed by inserting a chip capacitor into a recess and connecting it to a lead terminal.