JP4622231B2 - Noise filter - Google Patents

Description

  The present invention relates to a noise filter widely used in electronic devices such as small digital devices, OA devices, and portable terminals.

  As shown in FIG. 7, a conventional noise filter of this type includes an inductor conductor formed by laminating a plurality of coil conductors 2 formed on a magnetic layer 1 such as ferrite, and a capacitor conductor formed on a dielectric layer 3. 4 were laminated in an independent state. With this configuration, the conventional noise filter has a configuration in which an inductor portion including the inductor conductor and the magnetic layer 1 and a capacitor portion including the dielectric layer 3 and the capacitor conductor 4 are provided.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
Japanese Utility Model Publication No. 60-17895

  The conventional noise filter described above has a lumped-constant noise filter structure in which the inductor conductor and the capacitor conductor 4 are independently formed, so that only noise in the resonance frequency band between the inductor portion and the capacitor portion is removed. As a result, there is a problem that it is difficult to remove noise in a wide frequency band.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a noise filter that can remove noise in a wide frequency band.

  In order to achieve the above object, the present invention has the following configuration.

The invention according to claim 1 of the present invention includes a plurality of spiral first conductors, a plurality of spiral second conductors, and one or both of the first conductor and the second conductor. A plurality of insulator layers, one inductor conductor made of the plurality of first conductors, one capacitor conductor made of the plurality of second conductors, and a first connected to both ends of the inductor conductor. , A second extraction electrode, and a third extraction electrode connected to one end of the capacitor conductor, wherein the plurality of insulator layers include both the first conductor and the second conductor therein A plurality of insulator layers provided on the same surface, and each of the plurality of insulator layers has a second conductor formed between the lines of the first conductor along the first conductor , and Part of the first conductor forming the inductor conductor and the insulator layer provided with the first conductor A part of the second conductor forming the capacitor conductor provided in different insulator layers overlaps with each other in a top view, and the third extraction electrode is connected to the first conductor and the second conductor. Are provided in a separate insulator layer different from the insulator layer provided with one or both of them, and are formed in a spiral shape so as to face the first conductor forming the inductor conductor. Therefore, the second conductor forming the capacitor conductor is located beside most of the first conductor forming the inductor conductor, and this arrangement relationship is formed in a plurality of insulator layers. The capacitance between the lines of the first conductor and the second conductor can be obtained in a distributed constant, and the capacitance between the inductor conductor and the capacitor conductor can be obtained in a vertical direction. Distribution between the first and second conductors It is possible to obtain numerically, it is possible to remove noise in a wide frequency band. In addition, since the formation position of the third extraction electrode is not limited by the first and second conductors, the third extraction electrode can be easily formed, and the static electricity between the inductor conductor and the capacitor conductor can be formed. Capacitance can generate capacitance even between the first conductor and the third extraction electrode, so that the effect of removing noise in a wide frequency band can be obtained. .

As described above, the noise filter of the present invention includes a plurality of spiral first conductors, a plurality of spiral second conductors, and one or both of the first conductor and the second conductor. A plurality of insulator layers, one inductor conductor composed of the plurality of first conductors, one capacitor conductor composed of the plurality of second conductors, and a first connected to both ends of the inductor conductor, A second extraction electrode; and a third extraction electrode connected to one end of the capacitor conductor, wherein the plurality of insulator layers include both the first conductor and the second conductor therein. A plurality of insulator layers provided on the same surface, and each of the plurality of insulator layers includes a second conductor formed between the lines of the first conductor along the first conductor ; A part of the first conductor forming the conductor and the insulation provided with the first conductor. A part of the second conductor forming the capacitor conductor provided in the insulator layer different from the body layer is overlapped in a top view, and the third extraction electrode is connected to the first conductor and the first conductor. Since it is provided in a separate insulator layer different from the insulator layer provided with one or both of the two conductors, and is formed in a spiral shape facing the first conductor forming the inductor conductor, Since the second conductor forming the capacitor conductor is located beside most of the first conductor forming the inductor conductor, and this arrangement relationship is formed in the plurality of insulator layers, the first conductor is formed. It is possible to obtain a capacitance between the first conductor and the second conductor in a distributed constant manner, thereby producing an excellent effect that noise can be removed in a wide frequency band.

(Embodiment 1)
Hereinafter, with reference to the first embodiment will be described the invention described in particular claim 1 of the present invention.

  FIG. 1 is an exploded perspective view showing a noise filter according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view showing the noise filter.

  As shown in FIGS. 1 and 2, the noise filter according to the first embodiment of the present invention includes a plurality of spiral first conductors 11a and 11b, and a plurality of spiral second conductors 12a and 12b. A plurality of insulator layers 13 including both the first conductors 11a and 11b and the second conductors 12a and 12b; a single inductor conductor 14 including the plurality of first conductors 11a and 11b; One capacitor conductor 15 composed of the second conductors 12a and 12b, first and second lead electrodes 17 and 18 connected to both ends 16a and 16b of the inductor conductor 14, and one end of the capacitor conductor 15. And a third extraction electrode 20 connected to the portion 19a. Each of the plurality of insulator layers 13 includes the first conductor 11a and the second conductor 12a or the first conductor 11b and the second conductor 12b on the same surface, and forms the capacitor conductor 15. The second conductors 12a and 12b are formed between the lines of the first conductors 11a and 11b along the first conductors 11a and 11b forming the inductor conductor 14, respectively.

  The first conductors 11a and 11b are formed by plating a conductive material such as silver in a spiral shape, and are provided on the upper surfaces of the two insulator layers 13, respectively. Then, a spiral center portion 21a of the first conductor 11a provided on the upper surface of the lower insulator layer 13 and a spiral center portion 21b of the first conductor 11b provided on the upper surface of the upper insulator layer 13 are arranged. Are connected via a via electrode 22a provided on the insulator layer 13 to form one inductor conductor 14.

  Here, both end portions of the first conductor 11 a positioned below are a spiral center portion 21 a and one end portion 16 a of the inductor conductor 14. Further, both end portions of the first conductor 11b located above are a spiral central portion 21b and the other end portion 16b of the inductor conductor 14.

  The second conductors 12 a and 12 b are formed by plating a conductive material such as silver in a spiral shape, and one is provided on the upper surface of the two insulator layers 13. Then, a spiral center portion 23a of the second conductor 12a provided on the upper surface of the lower insulator layer 13 and a spiral center portion 23b of the second conductor 12b provided on the upper surface of the upper insulator layer 13 are provided. Are connected via the via electrode 22b to form one capacitor conductor 15.

  Here, both end portions of the second conductor 12 a located below are a spiral central portion 23 a and one end portion 19 a of the capacitor conductor 15. Further, both ends of the second conductor 12b located above are a spiral central portion 23b and the other end portion 19b of the capacitor conductor 15.

  The lower insulator layer 13 is formed between the lines of the first conductor 11a so that the second conductor 12a forming the capacitor conductor 15 on the same surface is along the first conductor 11a. Similarly, the upper insulator layer 13 is also formed with a second conductor 12b forming a capacitor conductor 15 on the same surface between the lines of the first conductor 11b so as to extend along the first conductor 11b. By setting it as such a structure, an electrostatic capacitance generate | occur | produces between 1st conductor 11a, 11b and 2nd conductor 12a, 12b, and a capacitor | condenser part is comprised.

The two insulator layers 13 are formed in a sheet shape from a dielectric material such as BaTiO ₃ or TiO ₂ or a magnetic material such as Ni—Cu—Zn—Co ferrite, and have an insulating property. The upper insulator layer 13 is provided with two via electrodes 22a and 22b, and the lower insulator layer 13 is provided with a via electrode 22c. Note that the number of the insulator layers 13 is not necessarily a total of two, one on the top and one on the top, and may be any other number as long as it is plural.

  In the above configuration, when a dielectric material is used as the insulator layer 13, if the dielectric material exhibits a high dielectric constant, the generated capacitance increases, and therefore attenuation can be achieved in a low frequency band. On the other hand, if the dielectric material exhibits a low dielectric constant, the generated capacitance is small, and therefore attenuation can be achieved in a high frequency band. In this case, the dielectric paste is applied between the lower insulator layer 13 and the first and second conductors 11a and 12a, and between the upper insulator layer 13 and the first and second conductors 11b and 12b. You may make it provide between.

  Further, when a magnetic material is used as the insulator layer 13, the inductance value can be adjusted by the magnetic permeability of the magnetic material, and the capacitance can be increased by utilizing the relative dielectric constant (10 to 15) of the magnetic material. Obtainable.

  The inductor conductor 14 includes first conductors 11a and 11b and constitutes an inductor section. Further, both end portions 16a and 16b of the inductor conductor 14 are connected to first and second extraction electrodes 17 and 18, respectively.

  The capacitor conductor 15 includes second conductors 12a and 12b, and the first conductors 11a and 11b, that is, the inductor conductor 14 constitute a capacitor portion. Further, one end portion 19 a of the capacitor conductor 15 is connected to the third extraction electrode 20 via a via electrode 22 c provided on the lower insulator layer 13. On the other hand, the other end portion 19b of the capacitor conductor 15 is not electrically connected. Accordingly, the capacitor conductor 15 is drawn out only through one end portion 19a thereof, and the portion drawn out to the outside is connected to the ground.

  That is, a signal from the outside flows only into the inductor conductor 14, but current flows through the capacitor conductor 15 due to the capacitance between the inductor conductor 14 and the capacitor conductor 15, and the current entering the capacitor conductor 15 is Dropped to the ground.

  Since the capacitor conductor 15 is a single continuous conductor without being interrupted, there is no need to provide a plurality of second conductors 12a and 12b on the same surface of the insulator layer 13, and the third lead electrode 20 Since only one is required, it is advantageous in terms of productivity and cost.

  The first extraction electrode 17 is provided on the upper surface of the lower insulating layer 13 and is connected to one end 16a of the first conductor 11a. The first extraction electrode 17 is formed by a method such as plating or printing with a conductive material such as silver.

  The second extraction electrode 18 is provided on the upper surface of the upper insulator layer 13 and is connected to the other end 16b of the first conductor 11b. The second extraction electrode 18 is also formed by a method such as plating or printing with a conductive material such as silver, like the first extraction electrode 17.

  The first and second lead electrodes 17 and 18 are preferably formed of the same material as the first conductors 11a and 11b and at the same time from the viewpoint of productivity.

  The third extraction electrode 20 is provided on the lower surface of the lower insulator layer 13 and is connected to the second conductor 12 a via the via electrode 22 c and one end 19 a of the capacitor conductor 15. The third extraction electrode 20 is divided into two directions and extracted to the outside. The third extraction electrode 20 is formed by a method such as plating or printing a conductive material such as silver.

  Three dummy insulator layers 25 are provided on the lower surface of the third extraction electrode 20 and the upper surfaces of the upper first and second conductors 11b and 12b, respectively. In this case, the number of dummy insulator layers 25 is not necessarily limited to three as shown in FIG. In addition, the material of the dummy insulator layer 25 may be anything as long as it has an insulating property, but if the same material as that of the insulator layer 13 is used, all the insulator layers can be formed of the same material. Generation of cracks can be suppressed.

  The third extraction electrode 20 may be provided on the upper surface of the lower insulator layer 13 provided with the first and second conductors 11a, 12a, but the lower surface of the lower insulator layer 13, That is, it is preferable to provide on the upper surface of a separate dummy insulator layer 25 different from the lower insulator layer 13. This is because the formation of the third extraction electrode 20 is not limited by the first and second conductors 11a and 12a in this way, and the third extraction electrode 20 can be easily formed. Because. In this case, it is possible to further generate a capacitance between the third extraction electrode 20 and the first conductor 11a opposed via the lower insulator layer 13.

  Then, by laminating the first conductors 11a and 11b, the second conductors 12a and 12b, the insulator layer 13, and the dummy insulator layer 25 in the above-described configuration, a laminate 26 as shown in FIG. 2 is obtained. It is done. First and second lead electrodes 17 and 18 connected to both ends 16 a and 16 b of the inductor conductor 14 are drawn out at both ends of the laminate 26, and the capacitor conductor 15 is placed at both sides of the laminate 26. The third extraction electrode 20 connected to the one end portion 19a is extracted. Further, first and second external electrodes 27 and 28 connected to the first and second lead electrodes 17 and 18 are provided on both end faces of the laminate 26, and on both side faces of the laminate 26. A third external electrode 29 connected to the third extraction electrode 20 is provided. Note that the third external electrode 29 may be provided integrally over the four sides of the laminate 26, that is, the upper and lower sides.

  Hereinafter, the first conductors 11a and 11b and the second conductors 12a and 12b will be described in more detail.

  The first conductors 11a and 11b and the second conductors 12a and 12b adjacent in the vertical direction through the upper insulator layer 13 are overlapped in a top view. By adopting such a configuration, the capacitance between the inductor conductor 14 and the capacitor conductor 15 is the same between the first conductor 11a and the second conductor 12a provided on the same surface of the lower insulator layer 13. 1st provided in the up-down direction via the upper insulator layer 13 as well as between the first conductor 11b and the second conductor 12b provided on the same surface of the upper insulator layer 13. Therefore, noise can be removed in a wider frequency band because it can be generated between the second conductors 11a and 11b and the second conductors 12a and 12b.

  The first conductors 11a and 11b and the second conductors 12a and 12b are not limited to plating, but may be formed using other methods such as printing and vapor deposition. Since it is easy to freely set the shapes of the conductors 11a and 11b and the second conductors 12a and 12b, the inductance value and the capacitance can be reduced by increasing the width of the conductor or increasing the thickness of the conductor. It can be adjusted easily. Furthermore, since the thickness of the first conductors 11a and 11b and the second conductors 12a and 12b can be increased as compared with a printing method or the like, the opposing area between the first conductors 11a and 11b and the second conductors 12a and 12b The capacitance of the capacitor unit can be further increased. Therefore, it is preferable to use plating as a method of forming the first conductors 11a and 11b and the second conductors 12a and 12b.

  In addition, when the first conductors 11a and 11b and the second conductors 12a and 12b are formed by plating, the first conductors 11a and 11b and the second conductors 12a and 12b are not formed directly on the insulator layer 13. If a green sheet is used as the insulator layer 13 and the first conductors 11a and 11b and the second conductors 12a and 12b are transferred to the insulator layer 13 made of the green sheet, the insulator layer 13 is Since it is a soft green sheet, the first conductors 11a and 11b and the second conductors 12a and 12b can be sunk into the insulator layer 13 when transferred to the insulator layer 13, whereby the first conductor The insulator layer 13 can be interposed between the second conductors 11a and 11b and the second conductors 12a and 12b. As a result, a short circuit between the inductor conductor 14 and the capacitor conductor 15 can be prevented. Further, since the insulator layer 13 is interposed between the first conductors 11a and 11b and the second conductors 12a and 12b, a groove is provided in the insulator layer 13, and the first conductor 11a, 11b, the second conductors 12a and 12b, or a shield conductor for preventing a short circuit or the like need not be separately provided, thereby improving productivity.

  Hereinafter, the manufacturing method of the noise filter in Embodiment 1 of the present invention will be described.

  In FIG. 1 and FIG. 2, first, a predetermined number of rectangular insulator layers 13 and dummy insulator layers 25 are respectively made from a mixture of dielectric material or magnetic material powder and resin as raw materials. At this time, the insulator layer 13 and the dummy insulator layer 25 are not immediately fired but are in a green sheet state.

  Next, one hole in one insulator layer 13 and two holes in another insulator layer 13 are drilled by laser, punching, or the like, and the holes are filled with silver to form vias. Electrodes 22a to 22c are provided.

  Next, a predetermined number of dummy insulator layers 25 are stacked, and the third extraction electrode 20 is formed on the uppermost upper surface by printing, plating, or the like.

  Next, one insulator layer 13 provided with a via electrode 22c at one location is disposed on the upper surface of the third extraction electrode 20.

  Next, the spiral first conductor 11a constituting the inductor conductor 14 and the spiral second conductor 12a constituting the capacitor conductor 15 are formed on the upper surface of the insulator layer 13 by plating.

  In this case, one end 19a of the capacitor conductor 15 which is the other end of the second conductor 12a is connected to the third extraction electrode 20 via the via electrode 22c. In addition, a first extraction electrode 17 is formed on the insulating layer 13 so as to be connected to one end 16a of the inductor conductor 14 which is the other end of the first conductor 11a. Further, the second conductor 12a is formed between the lines of the first conductor 11a so as to be along the first conductor 11a.

  Next, one insulator layer 13 provided with via electrodes 22a and 22b at two locations is disposed on the top surfaces of the first conductor 11a and the second conductor 12a.

  Next, the spiral first conductor 11b constituting the inductor conductor 14 and the spiral second conductor 12b constituting the capacitor conductor 15 are formed on the upper surface of the upper insulating layer 13 by plating. .

  In this case, the spiral center portion 21a of the first conductor 11a provided on the upper surface of the lower insulator layer 13 and the spiral center portion of the first conductor 11b provided on the upper surface of the upper insulator layer 13 are arranged. One inductor conductor 14 is formed so as to be connected to the via electrode 22a. Similarly, the spiral center portion 23a of the second conductor 12a provided on the upper surface of the lower insulator layer 13 and the spiral of the second conductor 12b provided on the upper surface of the upper insulator layer 13 are similar. One capacitor conductor 15 is formed so as to be connected to the central portion 23b via the via electrode 22b. In addition, a second extraction electrode 18 is formed on the upper insulator layer 13 so as to be connected to the other end portion 16 b of the inductor conductor 14. Further, the second conductor 12b is formed between the lines of the first conductor 11b so as to extend along the first conductor 11b.

  The first conductors 11a and 11b and the second conductors 12a and 12b can be formed by forming a conductor having a predetermined pattern shape on a separately prepared base plate (not shown) by plating, and then using this conductor. Transferred to the insulator layer 13 in a green sheet state.

  Next, a predetermined number of dummy insulator layers 25 are laminated on the top surfaces of the first conductor 11b and the second conductor 12b to obtain a laminate 26.

  In the above manufacturing process, in order to improve manufacturing efficiency, after providing a plurality of first conductors 11a and 11b and second conductors 12a and 12b on the insulator layer 13 and the dummy insulator layer 25, respectively, A plurality of laminates 26 may be obtained simultaneously by cutting into individual pieces.

  Next, the laminate 26 is fired at a predetermined temperature and time.

  Next, the first and second external electrodes 27 and 28 are connected to both end surfaces of the laminate 26 so as to be connected to the first and second extraction electrodes 17 and 18, and the third extraction electrode 20 is formed on both side surfaces. The third external electrodes 29 are respectively formed by printing silver so as to be connected to each other.

  Finally, nickel plating is formed on the surface of the first to third external electrodes 27 to 29, and low melting point metal plating such as tin or solder is formed on the surface of the nickel plating by plating.

  In the first embodiment of the present invention described above, the two spiral first conductors 11a and 11b, the two spiral second conductors 12a and 12b, and the first conductors 11a and 11b. And two insulator layers 13 having the second conductors 12a and 12b, one inductor conductor 14 including the two first conductors 11a and 11b, and the two second conductors 12a and 12b. A capacitor conductor 15 made of 12b, first and second lead electrodes 17 and 18 connected to both end portions 16a and 16b of the inductor conductor 14, and a first portion 19a connected to one end portion 19a of the capacitor conductor 15. The two insulating layers 13 are formed such that the lower insulating layer 13 forms the first conductor 11a and the second conductor 12a on the same surface, and the upper insulating layer 13 13 is the first conductor 11b and the second conductor 12b are formed on the same surface, and the two insulator layers 13 form the second conductor 12a between the lines of the first conductor 11a along the first conductor 11a and the second conductor 12a. Since the conductor 12b is formed between the lines of the first conductor 11b so as to be along the first conductor 11b, the capacitor conductor 15 is placed beside most of the first conductors 11a and 11b forming the inductor conductor 14. The second conductors 12a and 12b to be formed are positioned, and a plurality of such arrangements are formed such that the first conductor 11a and the second conductor 12a, the first conductor 11b and the second conductor 12b are formed. Therefore, the facing area between the first conductors 11a and 11b and the second conductors 12a and 12b can be increased, whereby the first conductors 11a and 11b and the second conductors 12a and 12b are Capacitance with capacitance Combined, together with the capacitance between these lines can be obtained distributed constant, since the electrostatic capacitance can be increased, to attenuate noise in a wide frequency band can be removed.

  In the noise filter according to the first embodiment of the present invention, two first conductors 11a and 11b and two second conductors 12a and 12b are provided, but other numbers may be used as long as they are plural. In this case, if three or more are provided, the capacitance between the inductor conductor 14 and the capacitor conductor 15 can be further increased.

  In addition, the lower and upper insulator layers 13 provided with the first conductors 11a and 11b are always provided with the second conductors 12a and 12b, but only the first conductors 11a and 11b or the second conductor layers 11a and 11b are provided. Another insulator layer 13 in which only the conductors 12a and 12b are formed may be provided separately. In this case, the inductance value of the inductor portion can be increased by providing a separate insulator layer 13 in which only the first conductors 11a and 11b are formed.

  Further, the third extraction electrode 20 is divided into two directions as shown in FIG. 1, and is extracted to the outside. However, the third extraction electrode 20 may be extracted in one direction.

  Further, the two insulator layers 13 are provided with only the first conductor 11a and the second conductor 12a or only the first conductor 11b and the second conductor 12b on the same surface. The surface is swirled so as to face the second conductors 12a and 12b via the first conductors 11a and 11b, or to face the first conductors 11a and 11b via the second conductors 12a and 12b. A shaped third conductor may be provided.

  Furthermore, the lower insulator layer 13 is provided with both the first conductor 11a and the second conductor 12a. However, the lower insulator layer 13 is provided with both the first conductor 11a and the second conductor 12a. The body layers 13 and other insulator layers 13 provided with only the second conductors 12a may be alternately stacked.

  As an example different from the first embodiment of the present invention, as shown in FIG. 3, the area of the third extraction electrode 20 provided in the dummy insulator layer 25 is substantially equal to the area of the insulator layer 13. If they are the same, electrostatic capacity is generated between the third extraction electrode 20 and the first conductors 11a and 11b, so that electrostatic capacity can also be generated between them. In this case, it is assumed that the third extraction electrode 20 should not be exposed to the outside except for the portion that is extracted to the outside, and when the other electrode is provided on the same dummy insulator layer 25, This is because it is necessary to prevent conduction with other electrodes, and there are times when they cannot be made exactly the same. In addition, if the area of the third extraction electrode 20 is substantially the same as the area of the insulator layer 13, the area of the insulator layer 13 can be maximized, so the third extraction electrode 20 and the first conductor 11a. , 11b can be reliably opposed to each other, and the generated capacitance can also be increased.

  Further, as an example different from the first embodiment of the present invention, as shown in FIG. 4, the third lead electrode 20 is opposed to the first conductor 11a forming the inductor conductor 14 and a dummy insulator. When formed in the layer 25 and having a spiral shape, the capacitance between the inductor conductor 14 and the capacitor conductor 15 is made to be the same as that of the first conductor 11a and the second conductor 11a provided on the same surface of the insulator layer 13. Since stray capacitance can be generated not only between the conductors 12a but also between the first conductor 11a and the third extraction electrode 20, noise can be removed in a wide frequency band.

  3 and 4 show only the third extraction electrode 20 and the dummy insulator layer 25 for the sake of simplicity.

(Embodiment 2)
Hereinafter, another example of the present invention will be described using the second embodiment.

  FIG. 5 is an exploded perspective view of the noise filter according to Embodiment 2 of the present invention. In addition, about the thing which has the structure similar to the structure of Embodiment 1 of the said invention, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 5, the second embodiment of the present invention differs from the first embodiment of the present invention in that the first conductor 11a and the capacitor conductor 15 forming the inductor conductor 14 are formed in the first embodiment of the present invention. Whereas the second conductor 12a to be provided is provided on the same surface of the lower insulator layer 13, the second embodiment of the present invention is such that the first conductor 11a and the second conductor 12a are electrically insulated from each other. The first conductor 11a is provided on the upper surface of the upper insulator layer 13 and the second conductor 12a is provided on the upper surface of the lower insulator layer 13 so as to face each other with the body layer 13 therebetween.

  In this case, the spiral central portion 21a of the first conductor 11a is connected to the second extraction electrode 18 via the via electrode 22a, and one end portion 19a of the capacitor conductor 15 which is one end portion of the second conductor 12a is And connected to the third extraction electrode 20 via the via electrode 22b. The second extraction electrode 18 is formed on the upper surface of the uppermost insulator layer 13, and the third extraction electrode 20 is formed on the lower surface of the lowermost insulator layer 13.

  By adopting such a configuration, the second conductor 12a for forming the capacitor conductor 15 is provided in a portion opposite to most of the first conductor 11a for forming the inductor conductor 14 with the insulator layer 13 interposed therebetween. Therefore, it is possible to increase the capacitance generated between the first conductor 11a and the second conductor 12a in a distributed constant, thereby removing noise in a wide frequency band. An effect is obtained.

  In the noise filter according to the second embodiment of the present invention, the number of the first conductors 11a and the number of the second conductors 12a formed so as to face each other with the insulator layer 13 interposed therebetween is one. A plurality of the conductors 11a and the second conductors 12a may be provided.

(Embodiment 3)
Hereinafter, another example of the present invention will be described using the third embodiment.

  FIG. 6 is an exploded perspective view of the noise filter according to Embodiment 3 of the present invention. In addition, about the thing which has the structure similar to the structure of Embodiment 1 of the said invention, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 6, the third embodiment of the present invention is different from the first embodiment of the present invention in that the first embodiment of the present invention has both the first conductors 11a and 11b and the second conductors 12a and 12b. A plurality of insulator layers 13 provided on the same surface are provided, whereas the third embodiment of the present invention provides an insulator layer provided with both the first conductor 11a and the second conductor 12a on the same surface. 13 is one.

  In this case, the spiral central portion 21a of the first conductor 11a is connected to the second extraction electrode 18 via the via electrode 22a, and one end portion 19a of the capacitor conductor 15 which is one end portion of the second conductor 12a is And connected to the third extraction electrode 20 via the via electrode 22b. In FIG. 6, the second extraction electrode 18 is formed on the lower surface of the insulator layer 13 together with the third extraction electrode 20, but may be formed on the upper dummy insulator layer 25.

  By adopting such a configuration, the second conductor 12a that forms the capacitor conductor 15 is positioned beside most of the first conductor 11a that forms the inductor conductor 14, and therefore the first conductor 11a. And the capacitance between the lines of the second conductor 12a can be obtained in a distributed manner, and this provides an effect that noise can be removed in a wide frequency band.

  In the noise filters according to the first to third embodiments of the present invention, the third extraction electrode 20 is provided on the lower surface of the insulating layer 13, that is, the upper surface of the lower dummy insulating layer 25. It may be provided on the upper surface of the dummy insulator layer 25 or the upper insulator layer 13.

  Further, although the inductor conductor 14 and the capacitor conductor 15 are one, a plurality of these may be provided as an array type noise filter. On the other hand, an inductor conductor and a capacitor conductor that do not function as a noise filter may be provided in the same package. Good.

  The noise filter according to the present invention can remove noise in a wide frequency band, and is useful for electronic devices that require noise countermeasures such as mobile phones and information devices.

1 is an exploded perspective view of a noise filter according to Embodiment 1 of the present invention. Perspective view of the noise filter Perspective view of main part showing another example of the noise filter Perspective view of main part showing another example of the noise filter The disassembled perspective view which shows the noise filter in Embodiment 2 of this invention. The disassembled perspective view which shows the noise filter in Embodiment 3 of this invention. An exploded perspective view showing a conventional noise filter

11a, 11b 1st conductor 12a, 12b 2nd conductor 13 Insulator layer 14 Inductor conductor 15 Capacitor conductor 17 1st extraction electrode 18 2nd extraction electrode 20 3rd extraction electrode

Claims (1)

A plurality of spiral first conductors; a plurality of spiral second conductors; a plurality of insulator layers comprising one or both of the first conductor and the second conductor; One inductor conductor composed of one conductor, one capacitor conductor composed of the plurality of second conductors, first and second lead electrodes connected to both ends of the inductor conductor, and the capacitor conductor A third extraction electrode connected to one end, and the plurality of insulator layers include a plurality of insulator layers including both the first conductor and the second conductor on the same surface. And the plurality of insulator layers each include a second conductor formed between the lines of the first conductor along the first conductor, and a part of the first conductor forming the inductor conductor And the conductor provided on the insulator layer different from the insulator layer provided with the first conductor. An insulator provided with a part of the second conductor forming the denser conductor so as to overlap with each other in a top view, and the third extraction electrode including one or both of the first conductor and the second conductor A noise filter provided in a separate insulator layer different from the layer and formed in a spiral shape so as to face the first conductor forming the inductor conductor.

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