JP3430964B2 - LC filter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LC filter used in various consumer appliances.

[0002]

2. Description of the Related Art A conventional LC filter will be described below with reference to the drawings.

FIG. 10 is a perspective view of a conventional LC filter, and FIG. 11 is an equivalent circuit diagram of the LC filter.

In FIGS. 10 and 11, a conventional LC filter forms an LC circuit by combining an inductance element and a capacitor element, and an input signal is LC
The filter circuit unit 1 is provided for processing by a circuit and outputting an output signal in a specific frequency range.

The filter circuit section 1 has a plurality of collars 2 between the collars 2 at both ends, and a multiple coaxial bobbin 4 in which a winding 3 is wound between the collars 2 and a multiple coaxial bobbin 4 are provided. It has a terminal 5 connected to the winding 3 and a chip capacitor 6 connected to the terminal 5 while having its end portion projected above or below the flange 2. Then, mount the chip capacitor 6 on the upper surface of the collar 2 of the multiple coaxial bobbin 4 by the collar 2
It is arranged between the terminals 5 protruding upward.

When mounting such an LC filter on a mounting board, the mounting board is provided with a processing circuit section for processing an output signal output from the filter circuit section of the LC filter. The processing circuit unit is formed of a wiring pattern having a plurality of connecting portions and electronic components connected by the connecting portions of the wiring pattern.

[0007]

SUMMARY OF THE INVENTION In the above conventional configuration,
Since only the filter circuit unit 1 that processes the input signal by the LC circuit and outputs the output signal in the specific frequency range is included, the output signal output from the filter circuit unit 1 cannot be processed. The processing circuit unit for this processing has to be formed on the mounting substrate.

As a result, the mounting board becomes larger by the area occupied by the processing circuit section, the mounting board on which the LC filter is mounted cannot be downsized, and the filter circuit section 1 and the processing circuit section are separated. Therefore, due to the influence of the peripheral circuit on the mounting board, fine adjustment at the time of electrical connection between the filter circuit unit and the processing circuit unit becomes complicated,
It has a problem of reducing reliability.

The present invention solves the above problems, and an object of the present invention is to provide an LC filter which can reduce the size of a mounting substrate and improve reliability.

[0010]

Means for Solving the Problems The present invention to achieve the above object, in particular, the the end of the terminal which projects above the multiple-coaxial bobbins, the above said multiple-coaxial bobbins thereby electrically connecting the connection portion of the substrate by placing the substrate in the processing circuit section, wherein by location mounting a chip capacitor electrically connecting the chip capacitors on the flange of the multiple-coaxial bobbins, and The windings are electrically connected.

With the above-mentioned structure, the upper part of the multiple coaxial bobbin is provided.
The end of is protruded pin punished above the Tarendo shaft bobbin
Since the board of the processing circuit section is arranged and the connecting section of the board is electrically connected , it is not necessary to provide the processing circuit section on the mounting board, and the mounting board can be made smaller by the area occupied by the processing circuit section.
It is possible to reduce the size of the mounting board on which the LC filter is mounted.

Further, by disposing the substrate above the bobbin, the filter circuit section and the processing circuit section are not separated,
Since they are connected to each other, they are not affected by peripheral circuits on the mounting board, and it is possible to facilitate fine adjustment when electrically connecting the filter circuit unit and the processing circuit unit and improve reliability.

[0013]

DETAILED DESCRIPTION OF THE INVENTION According to a first aspect of the present invention, particularly, the the end of the <br/> terminal which projects above the multiple-coaxial bobbins, of the multiple-coaxial bobbins thereby electrically connecting the connection portion of the substrate by placing the substrate of the processing circuit unit upward, the then location mounting a chip capacitor electrically connecting the chip capacitor on the flange of the multiple-coaxial bobbins In addition, the windings are electrically connected.

With the above-mentioned structure, the upper part of the multiple coaxial bobbin is provided.
The end of the protruding terminal should be treated above the multiple coaxial bobbin.
Since the board of the processing circuit section is arranged and the connecting section of the board is electrically connected , it is not necessary to provide the processing circuit section on the mounting board, and the mounting board can be made smaller by the area occupied by the processing circuit section.
It is possible to reduce the size of the mounting board on which the LC filter is mounted.

Further, by disposing the substrate above the bobbin, the filter circuit portion and the processing circuit portion are not separated but joined, so that the filter circuit portion and the processing circuit portion are not affected by the peripheral circuits on the mounting substrate and the like. It is possible to facilitate fine adjustment when electrically connecting the circuit unit and the processing circuit unit and improve reliability.

The invention according to claim 2 of the present invention is claim 1
In the invention described above, a through hole is provided in the connecting portion of the substrate, and an end portion of the terminal projecting above the flange is inserted into the through hole.

With the above structure, since the end of the terminal projecting above the collar is inserted into the through hole provided in the connecting portion of the substrate, the electrical connection between the connecting portion and the terminal can be facilitated. It is possible to prevent the displacement of the substrate.

The invention according to claim 3 of the present invention is claim 1
In the invention described above, a notch portion is provided in the connecting portion of the substrate, and an end portion of the terminal projecting above the flange is inserted into the notch portion.

With the above structure, since the end of the terminal projecting above the collar is inserted into the through hole provided in the connecting portion of the substrate, the electrical connection between the connecting portion and the terminal can be facilitated. It is possible to prevent the displacement of the substrate.

The invention according to claim 4 of the present invention is the invention according to claim 2.
Alternatively, in the invention according to claim 3, the end portion of the terminal projecting above the collar is projected above the board and is bent toward the board.

With the above structure, the end of the terminal projecting above the collar is projected above the board and is bent toward the board. Therefore, the board can be supported by the bent portion. It is possible to prevent the displacement of the substrate.

The invention according to claim 5 of the present invention is the invention according to claim 2.
~ In the invention described in any one of claims 4,
A structure in which the tip of the end of the terminal protruding above the collar is a thin core portion smaller than the diameter of the terminal, and the substrate is supported by a step portion formed at the base of the thin core portion. is there.

With the above structure, since the substrate is supported by the step portion, the height of the step portion can limit the distance between the substrate and the bobbin, and can regulate the substrate in the vertical direction.

The invention according to claim 6 of the present invention is the invention according to claim 5.
In the invention described above, the thin core portion is above the chip capacitor.
This is a structure formed at the tip of one of the terminals .

With the above structure, the substrate does not come into contact with the chip capacitor, and the displacement of the chip capacitor can be prevented.

The invention according to claim 7 of the present invention is claim 1
In the invention described above, a tuning circuit unit for tuning the filter circuit unit and the processing circuit unit is provided, and the tuning circuit unit is electrically connected to the processing circuit unit and is wound around a multiple coaxial bobbin of the filter circuit unit. It is a structure formed by winding a wire.

With the above structure, since the tuning circuit section is provided, the tuning between the filter circuit section and the processing circuit section can be facilitated.

(Embodiment) An LC filter according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an LC according to an embodiment of the present invention.
FIG. 2 is a perspective view of the filter, FIG. 2 is a top view of the LC filter, FIG. 3 is a sectional view taken along the line AA of the LC filter, FIG. 4 is a sectional view taken along the line BB of the LC filter, and FIG. 5 is a flange of the LC filter. FIG. 6 is an enlarged perspective view of an end portion of the terminal protruding upward, FIG. 6 is a top view of a filter circuit portion of the LC filter, FIG. 7 is a top view of a processing circuit portion of the LC filter, and FIG. FIG. 9 is a top view of the processing circuit unit before component mounting, and FIG. 9 is an equivalent circuit diagram of the LC filter.

1 to 8, the LC filter according to the embodiment of the present invention forms an inductance element .
Chip capacitor with the wound winding 14 and capacitor element
The filter circuit unit 11 that forms an LC circuit by combining the sensor 17 and the input signal is processed by the LC circuit to output an output signal in a specific frequency range, and an output signal output from the filter circuit unit 11. And a processing circuit section 12 for processing.

Further, the filter circuit section 11 has a collar 1 at both ends.
A multiple coaxial bobbin 15 having a plurality of collars 13 between three and windings 14 wound between the collars 13, and the multiple coaxial bobbin 1
5, the end portion of which is projected above or below the collar 13 as required, and the terminal 16 connected to the winding 14 and the upper surface of the collar 13 project above the collar 13. This terminal 1 is arranged between the ends of the terminal 16
6 and a chip capacitor 17 connected thereto.

Further, the processing circuit section 12 includes a substrate 20 on which a wiring pattern 19 having a plurality of connecting sections 18 is formed,
It has an electronic component 21 mounted on the substrate 20 while being connected by the connecting portion 18 of the wiring pattern 19.

A connecting means for electrically connecting the filter circuit section 11 and the processing circuit section 12 is provided, and this connecting means arranges the substrate 20 above the multiple coaxial bobbin 15 and connects the substrate 20. 18 is provided with a through hole 22, and the end portion of the terminal 16 protruding above the collar 13 is inserted into the through hole 22 to connect the end portion of the terminal 16 protruding above the collar 13 and the connecting portion of the substrate 20. 18 is used as a means for electrically connecting.

At this time, the tip 23 of the terminal 16 of the terminal 16 protruding above the collar 13 is a thin core portion 24 smaller than the diameter of the terminal 16 and a step portion formed in the middle of the thin core portion 24. The substrate 20 is supported at 25, and the thin core portion 24 is projected above the substrate 20. At this time, the height of the step portion 25 is determined so that the height of the chip capacitor 17 becomes low.

The equivalent circuit of this LC filter is
As shown in FIG.

In FIG. 9, the equivalent circuit (A) of the filter circuit section 11 and the equivalent circuit (B) of the processing circuit section 12 are connected by A, B, and C, respectively.
Then, the end portions of the terminals 16 protruding upward from the collar 13 of the multiple coaxial bobbin 15 and the connection portions 18 of the wiring pattern 19 of the substrate 20 in the processing circuit portion 12 are appropriately selected and connected to each other. There is.

Further, at this time, a tuning circuit unit 10 for tuning the filter circuit unit 11 and the processing circuit unit 12 is provided,
The tuning circuit unit 10 is electrically connected to the processing circuit unit 12 and is formed by winding a winding around the multiple coaxial bobbin 15 of the filter circuit unit 11. An equivalent circuit (C) of the tuning circuit unit 10 is formed. B is connected to the equivalent circuit (B) of the processing circuit unit 12.

The operation of the LC filter having the above structure will be described below.

With the above structure, a connecting means for electrically connecting the filter circuit section 11 and the processing circuit section 12 is provided, and this connecting means arranges the substrate 20 above the multiple coaxial bobbin 15 and also of the collar 13. Since the means for electrically connecting the terminal of the terminal 16 protruding upward and the connecting portion 18 of the substrate 20 is used, it is not necessary to provide the processing circuit portion 12 on the mounting substrate, and the mounting area corresponding to the area occupied by the processing circuit portion 12 is mounted. The board can be made small and the board 2 can be provided above the multiple coaxial bobbin 15.
By arranging 0, the filter circuit unit 11 and the processing circuit unit 12 are not separated but joined, so that they are not affected by peripheral circuits on the mounting substrate.
Furthermore, since the tuning circuit unit 10 that tunes the filter circuit unit 11 and the processing circuit unit 12 is provided, it is possible to make it extremely difficult to be affected by peripheral circuits.

Further, since the terminal of the terminal 16 projecting above the collar 13 is inserted into the through hole 22 provided in the connecting portion 18 of the substrate 20, the electrical connection between the connecting portion 18 and the terminal 16 is established. In addition to making it easy, it is possible to prevent the displacement of the substrate 20, and since the substrate 20 is supported by the step portion 25 formed in the middle of the thin core portion 24, the height of the step portion 25 allows the substrate 20 to be supported. And multiple coaxial bobbin 15
It is possible to limit the distance between the substrate 20 and the substrate 20 in the vertical direction of the substrate 20.

The chip capacitor 17 is arranged between the ends of the terminals 16 protruding above the collar 13, and the height of the chip capacitor 17 is lower than the height of the step 25. The substrate 20 does not come into contact with the chip capacitor 17, and the displacement of the chip capacitor 17 can be prevented.

As described above, according to the embodiment of the present invention, it is not necessary to provide the processing circuit section 12 on the mounting board, and the mounting board can be made smaller by the area occupied by the processing circuit section 12.
The mounting board on which the C filter is mounted can be miniaturized, and is not affected by peripheral circuits on the mounting board, etc., and finely adjusted when electrically connecting the filter circuit unit 11 and the processing circuit unit 12. Can be facilitated and reliability can be improved.

Further, it is possible to prevent the positional displacement of the substrate 20 in the horizontal direction, limit the distance between the substrate 20 and the multiple coaxial bobbin 15, and regulate the substrate 20 in the vertical direction.

Further, the substrate 20 is the chip capacitor 17
It is possible to prevent the displacement of the chip capacitor 17 without making contact with.

In the embodiment of the present invention, the substrate 2
0 is provided with a through hole 22 and the end portion of the terminal 16 protruding above the collar 13 is inserted so that the connecting portion 18 and the terminal 1
Although the electrical connection with the terminal 6 is facilitated, the notch is provided in the substrate 20 and the end of the terminal 16 is inserted to connect the terminal 18 to the terminal 1.
Even if 6 and 6 are connected, the same effect is produced.

In the embodiment of the present invention, the terminal 1
The step portion 25 formed in the middle of the thin core portion 24 having a diameter smaller than 6 supports the substrate 20, but nothing is formed in the middle,
Due to the difference between the diameter of the terminal 16 and the diameter of the thin core portion 24, a step formed at the base of the thin core portion 24 inevitably causes the substrate 20
Even if it supports, the same effect is produced.

Furthermore, if the thin core portion 24 protruding above the substrate 20 is bent toward the substrate 20 side, the substrate 20 can be supported by the bent portion, and the displacement of the substrate 20 is further reduced. Can be prevented.

[0048]

As described above, according to the present invention, it is not necessary to provide the processing circuit section on the mounting board, the mounting board can be made smaller by the area occupied by the processing circuit section, and the mounting board on which the LC filter is mounted can be made smaller. Provided is an LC filter which is improved in reliability and facilitates fine adjustment when electrically connecting the filter circuit unit and the processing circuit unit without being affected by peripheral circuits on the mounting substrate. be able to.

[Brief description of drawings]

FIG. 1 is a perspective view of an LC filter according to an embodiment of the present invention.

FIG. 2 is a top view of the LC filter.

3 is a cross-sectional view taken along the line AA of the LC filter shown in FIG.

4 is a cross-sectional view of the LC filter of FIG. 2 taken along the line BB.

FIG. 5 is an enlarged perspective view of an end portion of a terminal that is made to project above a collar of the LC filter.

FIG. 6 is a top view of a filter circuit section of the LC filter.

FIG. 7 is a top view of a processing circuit section of the LC filter.

FIG. 8 is a top view of a processing circuit section of the LC filter before mounting electronic components.

9A and 9B are equivalent circuit diagrams of the LC filter.

FIG. 10 is a perspective view of a conventional LC filter.

FIG. 11 is an equivalent circuit diagram of the LC filter.

[Explanation of symbols]

10 Tuning circuit section 11 Filter circuit section 12 Processing circuit section 13 Tsuba 14 windings 15 Multiple coaxial bobbins 16 terminals 17 Chip Capacitor 18 Connection 19 wiring patterns 20 substrates 21 electronic components 22 Through hole 23 Tip 24 Thin core 25 Step

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-17643 (JP, A) JP-A 61-150315 (JP, A) JP-A 8-306551 (JP, A) JP-A 61- 136285 (JP, A) Actual opening Flat 6-26215 (JP, U) Actual opening Sho 61-144617 (JP, U) Actual opening Sho 53-26487 (JP, U) Actual opening Sho 63-136421 (JP, U) 62-101209 (JP, U) 421-2113 (JP, U) 42-11382 (JP, Y1) 58-39 (58) Fields investigated (Int.Cl. ⁷ , DB name) H03H 5/00-7/12 H01F 27/00

Claims (7)

(57) [Claims] 1. An LC circuit is formed by combining a winding formed with an inductance element and a chip capacitor formed with a capacitor element , and an input signal is applied to the LC circuit.
A filter circuit unit that processes the output signal in a specific frequency range by a circuit and a processing circuit unit that processes the output signal output from the filter circuit unit is provided, and the filter circuit unit has collars at both ends. a plurality of collars between, and multiple-coaxial bobbins wound the winding between the collar, the implanted in the flange of the multiple-coaxial bobbins, have the end portions is above the collar
With the protruded upward and downward, and a terminal connected with said winding has a said chip capacitor connected to the terminals, wherein the processing circuit section, forming a wiring pattern having a plurality of connecting portions and a substrate, as well as connected by the connection portion of the wiring pattern has an electronic component mounted on the substrate, wherein an end portion of the terminal which projects above the multiple-coaxial bobbins, the A substrate of the processing circuit unit is arranged above the multiple coaxial bobbin to electrically connect the connecting portion of the substrate, and the multiple coaxial bobbin is provided.
LC filter above with location mounting a chip capacitor electrically connecting the chip capacitors on the flange and electrically connecting the windings of the. 2. The LC filter according to claim 1, wherein a through hole is provided in the connecting portion of the substrate, and an end portion of the terminal projecting above the flange is inserted into the through hole. 3. The LC filter according to claim 1, wherein a cutout portion is provided in the connecting portion of the substrate, and an end portion of the terminal projecting above the flange is inserted into the cutout portion. 4. The LC filter according to claim 2, wherein an end of the terminal projecting above the collar is projected above the substrate and bent toward the substrate. 5. A substrate having a step portion formed at a base of the thin core portion, wherein a tip end portion of an end portion of the terminal projecting above the collar is a thin core portion smaller than a diameter of the terminal. The LC filter according to any one of claims 2 to 4, which supports the LC filter. 6. The thin core portion is an end above the chip capacitor.
The LC filter according to claim 5, wherein the LC filter is formed at the tip of the child . 7. A tuning circuit section for tuning the filter circuit section and the processing circuit section is provided, and the tuning circuit section is electrically connected to the processing circuit section and wound around a multiple coaxial bobbin of the filter circuit section. The LC filter according to claim 1, which is formed by winding a wire.