JPH0241941Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a noise removal filter used in various electrical devices.

[Prior Art] As shown in FIG. 5, a roughly U-shaped input/output lead terminal 52 through which a ferrite bead 51 is inserted is housed in an insulating case 53 as a noise removal filter for removing high frequency noise from various electrical devices. It is known that cylindrical capacitors 56, 57 are passed through the legs 54, 55 of the input/output lead terminal 52 protruding from the insulating case 53, and the cylindrical capacitors 56, 57 are supported by a ground plate 58. It is being

By the way, in the noise removal filter shown in Fig. 5,
Not only does the insulating case 53 and the ground plate 58 make the filter larger, but also the U
Both legs 54 of the letter-shaped input/output lead terminal 52,
55 into the cylindrical capacitors 56, 57, etc., which require positioning accuracy, the assembly is time-consuming, and automatic assembly of the filter is difficult.

As a countermeasure for this, as shown in FIG. A noise removal filter has been proposed in which ferrite beads 67 and 68 are electrically conductively adhered to the main surfaces of the input and output lead terminals 62, and ferrite beads 67 and 68 are inserted into both legs 64 and 65 of an input/output lead terminal 62, and the entire body is covered with resin 69. ing.

In the configuration shown in FIG. 6, since the insulating case and the ground plate can be eliminated, the filter becomes smaller and lighter, but the legs 64, 65 of the input/output lead terminal 62
Since the filter and the grounding lead terminal 66 are not arranged in the same plane, when inserting the filter into a printed circuit board (not shown), automatic insertion becomes difficult and the insertion takes time and effort.

[Purpose of the invention] The purpose of the invention is to provide a noise removal filter that is small and lightweight and can be easily inserted automatically into a printed circuit board.

[Configuration of the invention] Therefore, the invention consists of a flat input lead terminal and a flat output lead terminal, and these input lead terminals and output lead terminals have their respective legs facing the same direction. an input/output lead terminal arranged in a substantially U-shape on the same plane so as to be pulled out, a leg of the input lead terminal of the input/output lead terminal, and a leg of the output lead terminal of the input/output lead terminal. and a chip coil connecting the input lead terminal and the output lead terminal of the input/output lead terminal. and a chip capacitor having both ends electrically bonded to the input/output lead terminal and the input/output lead terminal near the leg of the grounding lead terminal.

[Effects of the invention] According to the invention, since the input/output lead terminal and the grounding lead terminal are flat and arranged in the same plane, the chip coil or chip capacitor, the input/output lead terminal, and the grounding lead terminal can be easily connected to each other. Connections can be made two-dimensionally, the positioning of chip coils and chip capacitors is easy, and the connection positions of input/output lead terminals and grounding lead terminals of chip capacitors and the like can be determined relatively freely.

Further, according to the present invention, since the input/output lead terminal and the grounding lead terminal have a simple structure, the automatic assembly of the noise removal filter can be easily performed, and a low-cost noise removal filter can be obtained. .

Furthermore, according to the present invention, since the chip capacitor is connected near the leg of the ground lead terminal, the distance between the chip capacitor and the ground is shortened, and the inductance between the chip capacitor and the ground is reduced. This makes it possible to efficiently bypass high-frequency noise to ground through the chip capacitor, resulting in good noise removal characteristics.

[Example] Next, an example of the present invention will be described based on the accompanying drawings.

In FIG. 1a, the noise removal filter 1
is basically composed of a roughly U-shaped input/output lead terminal 2, a grounding lead terminal 3, a chip coil 4, and a chip capacitor 5.

The input/output lead terminal 2 has leg portions 6a and 7a.
It is divided into two roughly L-shaped and flat input lead terminals 6 and output lead terminals 7, which are arranged in the same plane so that they are parallel to each other, and both lead terminals 6,
Both ends of a rectangular flat chip coil 4 are electrically conductively bonded to the bent portions 6b, 7b of 7 with solder (not shown). If the chip coil 4 is used as the inductance component, the inductance can be made extremely large, and the inductance component can also be made smaller.

The grounding lead terminal 3 is also formed into a flat plate, and the legs 6a, 7a of the input/output lead terminals 6, 7 are
It is arranged parallel to the leg parts 6a, 7a on the same plane as, and in the center of both the leg parts 6a, 7a.

The chip capacitor 5 has electrodes 8 and 9 at both ends, and these electrodes 8 and 9 are electrically conductive to the wide part 3a of the ground lead terminal 3 and the leg part 7a of the output lead terminal 7 by soldering. is glued to.

It is preferable that the grounding lead terminal 3 is formed as short as possible, and that the chip capacitor 5 is bonded to the terminal 3 as close to the end 3b of the grounding lead terminal 3 as possible. In this way, the inductance of the grounding lead terminal 3 can be reduced, and high frequency noise can be smoothly guided to the ground via the grounding lead terminal 3.

The above chip coil 4 and chip capacitor 5
Approximately the upper half of the noise removal filter 1 including the noise removal filter 1 is covered with a resin 10, and each lead terminal 3, 6, 7 protruding from the resin 10 is connected to an automatic machine (not shown).
It is inserted into the printed circuit board by.

In this embodiment, since the lead terminals 3, 6, and 7 are arranged on the same plane, the filter 1 can be easily and automatically inserted into the printed circuit board, and the mounting time on the printed circuit board can be significantly shortened. Can be done. In addition, prior to mounting on the printed circuit board,
Each of the lead terminals 3, 6, and 7 may be bent, and the resin coating may be performed by molding to form a chip-shaped structure as a whole.

Further, in this embodiment, since each component is formed into a chip shape, the filter 1 can be quickly and easily assembled by an automatic machine. Further, if each lead terminal 3, 6, 7 is formed into a flat plate shape, the chip coil 4 and chip capacitor 5 can be easily bonded to each lead terminal 3, 6, 7, and the bonding strength can be increased.

The noise removal filter 1 of the above embodiment has an L-shaped equivalent circuit as shown in FIG. 1b. When an electric signal is passed between the input lead terminal 6 and the output lead terminal 7, the high frequency noise component is attenuated by the chip coil 4 and is induced to the arm via the chip capacitor 5 and the ground lead terminal 3. High frequency noise components in the signal are thereby removed.

In this embodiment, since the chip coil 4 is used as the inductance component, the inductance of the chip coil 4 can be made extremely large, and the high frequency noise removal characteristics can be improved.

FIG. 2a shows a second embodiment.

That is, the noise removal filter 16 in FIG. 2a
Here, a three-terminal flat chip capacitor 2 has three electrodes 17, 18, 19 and a pair of capacitance parts 20, 21 provided between adjacent electrodes.
2 is adopted, and each electrode 17, 18, 19 is soldered to the leg 6a of the input lead terminal 6, the wide part 3a of the grounding lead terminal 3, and the leg 7a of the output lead terminal 7. and are electrically conductively bonded. Note that instead of the flat chip capacitor 22, a cylindrical chip capacitor having three electrodes may be used. Furthermore, the chip capacitor is not necessarily one in which a pair of capacitive parts are integrally formed, but two independent chip capacitors may be used.

The equivalent circuit of the noise removal filter 16 of this embodiment is a π-type as shown in FIG.
1, the high frequency noise removal characteristics are further improved.

FIG. 3 shows yet another embodiment, in which the input/output lead terminal 25 is connected to the input leg 2.
6, a connecting portion 28 having a U-shaped extension portion 27 toward the grounding lead terminal 30 side, and an output leg portion 29. Two chip coils 31, 32 are placed between the legs 26, 29 and the connecting portion 28.
However, there are also three chip capacitors 33, 3 between the wide part 30a of the grounding lead terminal 30, the legs 26, 29, and the extension part 27 of the input/output lead terminal 25.
4 and 35 are arranged, respectively.

As shown in FIG. 4, cylindrical ferrite beads 37 and 38 may be used as the inductance component, and in this case, the input/output lead terminals 3
9 can be molded as a single piece. 40 is a grounding lead terminal, and 41 and 42 are chip capacitors.

[Brief explanation of the drawing]

FIG. 1a is a schematic front view of a noise removal filter to which the present invention is applied, FIG. 1b is an equivalent circuit diagram of the noise removal filter of FIG. 1a, and FIG. Figure b is an equivalent circuit diagram of the second embodiment, Figures 3 and 4 are schematic front views of the third and fourth embodiments, respectively, Figure 5 is a schematic vertical cross-sectional diagram of the first conventional example, and Figure 6 is a schematic diagram of the vertical cross section of the first conventional example. 2 is a schematic front view of a conventional example. 2... Lead terminal for input/output, 3... Lead terminal for earth, 4... Chip coil (inductance component), 5... Chip capacitor.

Claims (1)

[Scope of utility model registration request] It consists of a flat input lead terminal and a flat output lead terminal, and these input lead terminals and output lead terminals are arranged in a roughly U shape on the same plane so that their respective legs are pulled out in the same direction. An input/output lead terminal arranged to form a shape, and a leg part of the input lead terminal and an output lead terminal of the input/output lead terminal in the same direction as these legs. A flat grounding lead terminal pulled out in the same plane, a chip coil connecting the input lead terminal and output lead terminal of the input/output lead terminal, and the vicinity of the leg of the grounding lead terminal. and a chip capacitor having both ends conductively bonded to input/output lead terminals.