JP4525223B2 - LC composite filter parts - Google Patents

Description

  The present invention relates to an LC composite filter component including an inductor and a capacitor that function as a filter for removing noise of an electronic device or the like.

As an anti-noise measure for electronic devices, an L-type, T-type, or π-type EMI (ElectroMagnetic Interference) filter is known in which an inductor (coil portion) and a capacitor (capacitor portion) are combined.
With the recent miniaturization of electronic equipment, a smaller EMI filter has been desired, and it is formed of an internal conductor pattern using a dielectric material, a magnetic material, or a mixed material of a dielectric material and a magnetic material. A small monolithic LC composite filter component incorporating a filter circuit including an inductor portion and a capacitor portion has been proposed.
The LC composite filter component having such a structure includes an inductor and a capacitor formed by forming a conductor on the surface of a mixed material of a dielectric material and a magnetic material and laminating them. In this case, the layer in which the conductive film (internal conductor) serving as the inductor and the capacitor is formed is arranged in the intermediate layer of the multilayer body (see, for example, Patent Document 1).
This LC composite filter component is a distributed constant type LC composite comprising a pair of inductors, a signal line side coil and a ground line side coil, and a capacitor formed by capacitively coupling the pair of inductors facing each other. It is a filter.
Japanese Patent No. 3492766 (FIG. 2)

  However, the conventional LC composite filter component has the following problems. That is, in the conventional LC composite filter component, when adjusting the capacitance value of the capacitor, it is necessary to change the pattern shape of the signal line side and ground line side coils, and the inductance of the signal line side and ground line side coils. There is a problem that changes.

  The present invention has been made in view of the above-described problems, and provides an LC composite filter component capable of easily setting a capacitance value between a pair of coils without changing a pattern shape. Objective.

The present invention employs the following configuration in order to solve the above problems. That is, the LC composite filter component of the present invention includes a laminated body configured by laminating a plurality of insulating materials, and a coil conductor pattern provided inside the laminated body and formed on the surfaces of the plurality of insulating materials. A signal coil conductor which is a coil conductor connected to a pair of signal terminal electrodes provided at both ends of the laminate, and a coil conductor which is provided inside the laminate and constitutes the signal coil conductor A plurality of coil conductor patterns formed on a surface of the plurality of insulating materials including at least one of the plurality of insulating materials formed with a pattern, and the signal coil conductors in the stacking direction of the plurality of insulating materials; A floating coil conductor that is a coil conductor that is spaced apart, a coil conductor pattern that constitutes the signal coil conductor, and the floating coil conductor are configured. Formed on a surface of the insulating material coil conductor patterns are laminated adjacently to have been formed the insulating material, the signal coil conductor and to face the floating coil conductor disposed, not short-circuited with another conductor A planar conductor; and a ground conductor formed on the surface of the insulating material so as to face the floating coil conductor and connected to a ground terminal electrode provided outside the laminate, the signal coil conductor and the floating conductor A first capacitor portion is formed by capacitively coupling the coil conductor via the planar conductor, and a second capacitor portion is formed by capacitively coupling the floating coil conductor and the ground conductor. .

According to the LC composite filter component of the present invention, the planar conductor is disposed opposite to the coil conductor pattern constituting the signal coil conductor and the coil conductor pattern constituting the floating coil conductor, and between the signal coil conductor and the planar conductor. The first capacitor portion is formed by the capacitance generated in step S1 and the capacitance generated between the floating coil conductor and the planar conductor. Further, since the floating coil conductor and the ground conductor are arranged to face each other, the second capacitor portion is formed by the capacitance generated between the floating coil conductor and the ground conductor.
Here, the area where the coil conductor pattern constituting the signal coil conductor and the floating coil conductor and the planar conductor face each other can be adjusted by changing the shape of the planar conductor. Therefore, the capacitance value of the first capacitor unit can be easily set without changing the shapes of the signal coil conductor and the floating coil conductor.
Further, on the equivalent circuit, the first capacitor portion and the second capacitor portion are arranged in series between the pair of signal terminal electrodes and the ground terminal electrode. Therefore, the capacitance value between the signal terminal electrode and the ground terminal electrode, which is the capacitance value of the LC composite filter component, is the capacitance value of the first capacitor portion and the capacitance value of the second capacitor portion. Therefore, the capacitance is smaller than the capacitance values of the first and second capacitor portions. As a result, even if a high-speed signal is input from the signal terminal electrode, the waveform distortion of the input signal can be suppressed.

In the LC composite filter component of the present invention, the coil conductor pattern constituting the floating coil conductor includes all of the plurality of the insulating materials formed with the coil conductor pattern constituting the signal coil conductor. It is preferably formed on the material.
According to the LC composite filter component according to the present invention, the coil conductor pattern that forms the floating coil is formed on all of the plurality of insulating materials on which the signal coil conductor is formed, thereby reducing the number of layers of the multilayer body. be able to.

According to the LC composite filter component of the present invention, the capacitance value of the first capacitor unit can be easily set without changing the design of the signal coil conductor and the floating coil conductor by changing the shape of the planar conductor. be able to.
Further, the first capacitor portion and the second capacitor portion are arranged in series between the signal terminal electrode and the ground terminal electrode. Thereby, the electrostatic capacitance value of LC composite filter components becomes smaller than the electrostatic capacitance value of a 1st and 2nd capacitor part. As a result, even if a high-speed signal is input from the signal terminal electrode, the waveform distortion of the input signal can be suppressed. Therefore, it can be applied to a high-speed signal line.

  Hereinafter, an embodiment of an LC composite filter component according to the present invention will be described with reference to the drawings. In this embodiment, the present invention is applied to a three-terminal type noise filter. FIG. 1 is an exploded perspective view of the LC composite filter component in the LC composite filter component in this embodiment, and FIG. FIG. 3 is an external perspective view of the LC composite filter component showing the completed state of FIG. 1, and FIG. 4 is an equivalent circuit diagram thereof.

  1 to 3, the LC composite filter component 1 has a structure in which a plurality of sheet-like insulating materials are laminated and integrated. In addition, a pair of signal terminal electrodes 11 and 12 connected to a signal coil conductor 56 (described later) are provided on two opposing side surfaces of the LC composite filter component having a substantially rectangular parallelepiped laminate, and the LC composite filter A pair of ground terminal electrodes 13 and 14 connected to first and second ground conductors 54 and 55, which will be described later, are provided on the two opposite side surfaces of the component.

A laminated body obtained by laminating a plurality of insulating materials is composed of 13 layers of sheet-like insulating materials from the top in the order of the first cover layer 21, the first to eleventh insulating materials 22 to 32, and the second cover layer 33. It is set as the structure laminated | stacked on. Here, a dielectric material is used as the insulating material.
In addition, the 1st and 2nd cover layers 21 and 33 are not limited to 1 layer mentioned above, Two or more layers may be sufficient.

The first to eleventh insulating materials 22 to 32 have first to tenth coil conductor patterns 41 to 50, first to third planar conductors 51 to 53, and first and second ground conductors 54 and 55 on their upper surfaces. Is provided. The signal coil conductor 56 is formed by connecting the first to fourth coil conductor patterns 41 to 44, and the floating coil conductor 57 is formed by connecting the fifth to tenth coil conductor patterns 45 to 50. The
The first to tenth coil conductor patterns 41 to 50, the first to third planar conductors 51 to 53, and the first and second ground conductors 54 and 55 are printed with a conductor such as silver, for example. It is formed by a known method such as plating.

  Among these, the first coil conductor pattern 41 is a substantially U-shaped conductor pattern and is formed on the upper surface of the third insulating material 24. An extraction electrode 41 a connected to the signal terminal electrode 11 is formed at one end of the first coil conductor pattern 41. Further, a through hole Ha penetrating the third insulating material 24 is provided at the other end of the first coil conductor pattern 41.

The second coil conductor pattern 42 is a conductor pattern that forms a coil pattern for approximately one turn, and is formed on the upper surface of the fifth insulating material 26 in the same manner as the first coil conductor pattern 41. One end of the second coil conductor pattern 42 is formed on the upper surface of the third insulating material 24 described above via the through hole Ha and the through hole Hb formed in the fourth insulating material 25. The one-coil conductor pattern 41 is electrically connected. Further, a through hole Hc that penetrates the fifth insulating material 26 is provided at the other end of the second coil conductor pattern 42.
The through hole Hb is formed at a position overlapping the through hole Ha in the stacking direction of the stacked body.

The third coil conductor pattern 43 is a conductor pattern that forms a coil pattern for approximately one turn, and is formed on the upper surface of the seventh insulating material 28 in the same manner as the first and second coil conductor patterns 41 and 42. Has been. In addition, one end portion of the third coil conductor pattern 43 is formed on the upper surface of the fifth insulating material 26 described above through the through hole Hc and the through hole Hd formed in the sixth insulating material 27. The second coil conductor pattern 42 is electrically connected. In addition, a through hole He penetrating the seventh insulating material 28 is provided at the other end of the third coil conductor pattern 43.
The through hole Hd is formed at a position overlapping the through hole Hc in the stacking direction of the stacked body.

The fourth coil conductor pattern 44 is a substantially U-shaped conductor pattern, and is formed on the upper surface of the ninth insulating material 30 in the same manner as the first to third coil conductor patterns 41 to 43. Then, one end portion of the fourth coil conductor pattern 44 is formed on the upper surface of the above-described seventh insulating material 28 through the through hole He and the through hole Hf formed in the eighth insulating material 29. The third coil conductor pattern 43 is electrically connected. An extraction electrode 44 a connected to the signal terminal electrode 12 is formed at the other end of the fourth coil conductor pattern 44.
As described above, the first to fourth coil conductor patterns 41 to 44 are electrically connected to form the signal coil conductor 56.
The through hole Hf is formed at a position overlapping the through hole He in the stacking direction of the stacked body.

  On the other hand, the fifth coil conductor pattern 45 is a conductor pattern that forms a coil pattern for approximately one turn, and is formed on the upper surface of the second insulating material 23 in the same manner as the first to fourth coil conductor patterns 41 to 44. Has been. A through hole Hg that penetrates the second insulating material 23 is provided at one end of the fifth coil conductor pattern 45.

  The sixth coil conductor pattern 46 is a conductor pattern that forms a coil pattern for approximately one turn, and the first coil conductor pattern 41 is formed in the same manner as the first to fifth coil conductor patterns 41 to 45. Further, the upper surface of the third insulating material 24 is formed so as not to intersect the first coil conductor pattern 41. Then, one end portion of the sixth coil conductor pattern 46 is electrically connected to the fifth coil conductor pattern 45 formed on the upper surface of the second insulating material 23 described above through the through hole Hg. Yes. A through hole Hh that penetrates the third insulating material 24 is provided at the other end of the sixth coil conductor pattern 46.

The seventh coil conductor pattern 47 is a conductor pattern that forms a coil pattern for approximately one turn, and the second coil conductor pattern 42 is formed in the same manner as the first to sixth coil conductor patterns 41 to 46. Further, the upper surface of the fifth insulating material 26 is formed so as not to intersect the second coil conductor pattern 42. In addition, one end portion of the seventh coil conductor pattern 47 is formed on the upper surface of the third insulating material 24 described above through the through hole Hh and the through hole Hi formed in the fourth insulating material 25. The sixth coil conductor pattern 46 is electrically connected. Further, a through hole Hj that penetrates the fifth insulating material 26 is provided at the other end of the seventh coil conductor pattern 47.
The through hole Hi is formed at a position overlapping the through hole Hh in the stacking direction of the stacked body.

The eighth coil conductor pattern 48 is a conductor pattern that forms a coil pattern for approximately one turn, and the third coil conductor pattern 43 is formed in the same manner as the first to seventh coil conductor patterns 41 to 47. Further, the upper surface of the seventh insulating material 28 is formed so as not to intersect the third coil conductor pattern 43. Then, one end portion of the eighth coil conductor pattern 48 is formed on the upper surface of the fifth insulating material 26 described above through the through hole Hj and the through hole Hk formed in the sixth insulating material 27. The seventh coil conductor pattern 47 is electrically connected. Further, a through hole Hl that penetrates the seventh insulating material 28 is provided at the other end of the eighth coil conductor pattern 48.
The through hole Hk is formed at a position overlapping the through hole Hj in the stacking direction of the stacked body.

The ninth coil conductor pattern 49 is a conductor pattern that forms a coil pattern for approximately one turn, and the fourth coil conductor pattern 44 is formed in the same manner as the first to eighth coil conductor patterns 41 to 48. Further, the upper surface of the ninth insulating material 30 is formed so as not to intersect the fourth coil conductor pattern 44. Then, one end portion of the ninth coil conductor pattern 49 is formed on the upper surface of the seventh insulating material 28 described above through the through hole Hl and the through hole Hm formed in the eighth insulating material 29. The eighth coil conductor pattern 48 is electrically connected. A through hole Hn that penetrates the ninth insulating material 30 is provided at the other end of the ninth coil conductor pattern 49.
The through hole Hm is formed at a position overlapping the through hole Hl in the stacking direction of the stacked body.

The tenth coil conductor pattern 50 is a conductor pattern that forms a coil pattern for approximately one turn, and is formed on the upper surface of the tenth insulating material 31 in the same manner as the first to ninth coil conductor patterns 41 to 49. Has been. Then, one end of the tenth coil conductor pattern 50 is electrically connected to the ninth coil conductor pattern 49 formed on the upper surface of the above-described ninth insulating material 30 through the through hole Hn. Yes.
As described above, the fifth to tenth coil conductor patterns 45 to 50 are electrically connected to form the floating coil conductor 57.
Note that the signal coil conductor 56 and the floating coil conductor 57 are formed so that the spiral directions of the signal coil conductor 56 and the floating coil conductor 57 do not overlap each other in the stacking direction of the stacked body.

The first planar conductor 51 has a substantially rectangular shape and is formed on the upper surface of the fourth insulating material 25. The second planar conductor 52 is formed on the upper surface of the sixth insulating material 27. The three-plane conductor 53 is formed on the upper surface of the eighth insulating material 29.
The first planar conductor 51 is formed so as to overlap with the conductor patterns 41b, 42a, 46a, 47a, which are part of the coil conductor pattern forming the signal coil conductor 56 and the floating coil conductor 57, in the stacking direction of the stacked body. The second planar conductor 52 is formed so as to overlap the conductor patterns 42a, 43a, 47a, 48a in the stacking direction of the multilayer body, and the third planar conductor 53 is a conductor in the stacking direction of the multilayer body. It is formed so as to overlap with the patterns 43a, 44b, 48a, 49a. The first capacitor portion 61 shown in FIG. 4 is formed by the electrostatic capacity of the overlapping portions.
The capacitance value of the first capacitor unit 61 includes the shapes of the first to third planar conductors 51 to 53, the line widths of the conductor patterns 41b, 42a, 43a, 44b, 46a, 47a, 48a, and 49a. It is configured to be adjustable by changing the shape as appropriate.

The first ground conductor 54 has a substantially rectangular shape and is formed on the upper surface of the first insulating material 22. A lead electrode 54 a connected to the ground terminal electrode 13 is formed at one end of the first ground conductor 54. An extraction electrode 54 b connected to the ground terminal electrode 14 is formed at the other end of the first ground conductor 54.
The second ground conductor 55 is formed on the upper surface of the eleventh insulating material 32 in the same manner as the first ground conductor 54. A lead electrode 55 a connected to the ground terminal electrode 13 is formed at one end of the second ground conductor 55. In addition, a lead electrode 55 b connected to the ground terminal electrode 14 is formed at the other end of the second ground conductor 55.
The first ground conductor 54 is formed so as to overlap the fifth coil conductor pattern 45 that forms the floating coil conductor 57 in the stacking direction of the stacked body. The second ground conductor 55 is formed so as to overlap the tenth coil conductor pattern 50 in the stacking direction of the stacked body. The second capacitor portion 62 shown in FIG. 4 is formed by the electrostatic capacitances of the overlapping portions.

  As shown in FIG. 4, the LC composite filter component 1 configured as described above has a second capacitor portion 62 formed between the ground G and the floating coil conductor 57 in the equivalent circuit thereof. Therefore, the LC composite filter of the present embodiment is different from the distributed constant type LC composite filter component in which the floating coil conductor is directly connected to the ground in the equivalent circuit.

The manufacturing method of the LC composite filter component of the present invention configured as described above will be described below.
First, an organic binder, an organic solvent, and a dispersing agent are added to the dielectric material powder, and a green sheet is prepared by a doctor blade method to form sheet-shaped first and second covers having a predetermined shape (for example, rectangular shape). The layers 21 and 33 and the first to eleventh insulating materials 22 to 32 are manufactured. Next, drilling is performed at predetermined positions of the second to ninth insulating materials 23 to 30 using a known method such as laser or punching to provide through holes Ha to Hn.

  Next, first to tenth coil conductor patterns 41 to 50, first to third planar conductors 51 to 53, first and second ground conductors 54 on the top surfaces of the first to eleventh insulating materials 22 to 32, 55 are formed so as not to be short-circuited to each other by using a known method such as printing or transfer using a conductive paste such as silver.

At this time, an extraction electrode 41 a is provided at one end of the first coil conductor pattern 41, an extraction electrode 44 a is provided at one end of the fourth coil conductor pattern 44, and extraction electrodes 54 a and 54 b are provided at both ends of the first ground conductor 54. Lead electrodes 55a and 55b are integrally and continuously formed on both ends of the two ground conductors 55, respectively.
In addition, the through holes Ha to Hn are filled with a conductive material such as silver which is integrally continuous with a conductor formed in the insulating material provided with the through holes. In addition, the conductor formed on the insulating material connected through the through hole is brought into contact with the conductor of the through hole by providing a convex electrode portion (not shown) on the conductor side, and is electrically connected. It has become so.

  Next, the first cover layer 21, the first to eleventh insulating materials 22 to 32, and the second cover layer 33 are laminated, and the laminate 15 is formed by thermocompression bonding with a press. Then, this is fired at 900 ° C., the signal terminal electrodes 11 and 12 and the ground terminal electrodes 13 and 14 are formed using silver, and the plating film is formed by using Ni (nickel) and Sn (tin). To do.

In the LC composite filter component 1 configured in this way, the first to third planar conductors 51 to 53 are arranged to face the signal coil conductor 56 and the floating coil conductor 57, respectively, so that the stacking direction of the stacked body A first capacitor portion 61 having a capacitance value corresponding to the overlapping area is formed.
Here, the capacitance value of the first capacitor unit 61 can be adjusted by changing the shapes of the first to third planar conductors 51 to 53. Therefore, the capacitance value of the first capacitor unit 61 can be easily set without changing the shapes of the signal coil conductor 56 and the floating coil conductor 57.

  In addition, the first and second ground conductors 54 and 55 are arranged to face the floating coil conductor 57, respectively, so that the second capacitor unit has a capacitance value corresponding to the area where they overlap each other in the stacking direction of the stacked body. 62 is formed. Accordingly, the first capacitor portion 61 and the second capacitor portion 62 are arranged in series between the signal terminal electrodes 11 and 12 and the ground terminal electrodes 13 and 14 on the equivalent circuit. From the above, the capacitance value between the signal terminal electrodes 11 and 12 and the ground terminal electrodes 13 and 14, which is the capacitance value of the LC composite filter component, is equal to the capacitance value of the first capacitor unit 61 and the first capacitance value. Since the capacitance is a combined capacitance of the capacitance values of the two capacitor portions 62, the capacitance is smaller than the capacitance values of the first and second capacitor portions 61 and 62. As a result, even if a high-speed signal is input from the signal terminal electrodes 13 and 14, since the capacitance value is small, distortion of the waveform of the input signal can be suppressed. Therefore, it can be applied to a high-speed signal line.

In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, the LC composite filter parts described above can be arranged in an array by arranging a plurality of sets having the above-described configuration.
The first to third planar conductors 51 to 53 are arranged so as to face the signal coil conductor 56 and the floating coil conductor 57 at three locations. Depending on the situation, there may be one or two locations.
In addition, the first and second ground conductors 54 and 55 are arranged so as to face the floating coil conductor 57 at two places, either of which depends on the desired capacitance value of the second capacitor unit 62. There may be only one.

Further, for example, the first, second, sixth, and seventh coil conductor patterns 41, 42, 46, and 47 formed on the upper surfaces of the third to fifth insulating materials 24 to 26, the first planar conductor 51, and As shown in FIG. 5, the first, second, sixth and seventh coil conductor patterns 41, 42, 46 and 47 have their respective conductor patterns 41b, 42a, 46a and 47a thickened, The configuration may be such that the line width of the one-plane conductor 51 is increased and the length in the longitudinal direction is shorter than the conductor patterns 41b, 42a, 46a, 47a.
Thus, when the first planar conductor 51 is formed on the surface of the fourth insulating material 25, even if the first planar conductor 51 is displaced, the first, second, sixth, and seventh coils. Since the area in which the conductor patterns 41, 42, 46, 47 and the first planar conductor 51 overlap in the stacking direction of the stacked body is constant, the tolerance for manufacturing errors increases. The same effect can be obtained even when this configuration is applied to other coil conductor patterns and planar conductors.
Here, the first to third planar conductors 51 to 53 do not interfere with the magnetic fluxes generated in the signal coil conductor 56 and the floating coil conductor 57, respectively, and thus the signal coil conductor 56 and the floating coil in the stacking direction of the multilayer body. It is desirable that it is formed so as not to intersect the conductor 57.

It is a disassembled perspective view which shows LC composite filter components in one Embodiment of this invention. It is a top view which shows the 1st to 11th insulating material of FIG. It is an external appearance perspective view which shows LC composite filter component of FIG. FIG. 2 is an equivalent circuit diagram illustrating the LC composite filter component of FIG. 1. It is a top view which shows the 3rd-5th insulating material which can apply this invention other than embodiment concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LC composite filter components 11 and 12 Signal terminal electrode 13 and 14 Ground terminal electrode 21 1st cover layer 22 1st insulating material 23 2nd insulating material 24 3rd insulating material 25 4th insulating material 26 5th insulating material 27 6th Insulating material 28 Seventh insulating material 29 Eighth insulating material 30 Ninth insulating material 31 Tenth insulating material 32 Eleventh insulating material 33 Second cover layer 41 First coil conductor pattern 42 Second coil conductor pattern 43 Third coil conductor pattern 44 4th coil conductor pattern 45 5th coil conductor pattern 46 6th coil conductor pattern 47 7th coil conductor pattern 48 8th coil conductor pattern 49 9th coil conductor pattern 50 10th coil conductor pattern 51 1st plane conductor 52 2nd Planar conductor 53 Third plane conductor 54 First ground conductor 55 Second ground conductor 56 Signal coil conductor 7 floating coil conductor 61 first capacitor portion 62 and the second capacitor portion

Claims (2)

A laminate formed by laminating a plurality of insulating materials;
Coil conductors that are provided inside the laminate and that are configured by a plurality of coil conductor patterns formed on the surface of the insulating material, and that both ends are connected to a pair of signal terminal electrodes provided outside the laminate. A signal coil conductor,
Coil conductor patterns formed on the surfaces of the plurality of insulating materials, including at least one of the plurality of insulating materials provided inside the multilayer body and formed with a coil conductor pattern constituting the signal coil conductor. A floating coil conductor that is a coil conductor that is arranged apart from the signal coil conductor in the stacking direction of the plurality of insulating materials,
A coil conductor pattern constituting the signal coil conductor and a coil conductor pattern constituting the floating coil conductor are formed on a surface of the insulating material laminated adjacent to the insulating material, and the signal coil conductor and the A planar conductor disposed opposite to the floating coil conductor and not short-circuited with other conductors;
A ground conductor formed on the surface of the insulating material so as to face the floating coil conductor and connected to a ground terminal electrode provided outside the laminate,
The signal coil conductor and the floating coil conductor are capacitively coupled through the planar conductor to form a first capacitor portion,
The LC composite filter component, wherein the floating coil conductor and the earth conductor are capacitively coupled to form a second capacitor portion.   The coil conductor pattern constituting the floating coil conductor is formed on a plurality of the insulating materials including all of the plurality of the insulating materials on which the coil conductor patterns constituting the signal coil conductor are formed. The LC composite filter component according to claim 1.

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