JP2013219295A - Common mode noise filter - Google Patents

Abstract

An object of the present invention is to provide a common mode noise filter that can improve the connection reliability with an external electrode even if the size is reduced.
A common mode noise filter according to the present invention includes a plurality of insulating layers 17a to 17e including first and second spiral conductors 11 and 13, first and second lead conductors 12 and 14, and The main body 18 having these and first to fourth external electrodes 19 to 22 provided on the surface of the main body 18 are provided, and the first and second lead electrodes 15 and 16 are connected to the insulating layers 17a to 17e. A conductor 23 penetrating the insulating layers 17a to 17e formed above and below each of the first and second lead electrodes 15 and 16 is provided, and the first and second lead electrodes 15 are not exposed. , 16 and the conductor 23, and the conductor 23 and the first and second lead conductors 12 and 14 are connected to the first to fourth external electrodes 19 to 22, respectively. is there.
[Selection] Figure 1

Description

  The present invention relates to a common mode noise filter used in various electronic devices such as digital devices, AV devices, and information communication terminals.

  As shown in FIG. 9, the conventional common mode noise filter of the related art includes first and second spiral conductors 2a and 3a on the upper surfaces of the first to fourth insulating layers 1a to 1d, The second lead conductors 2b and 3b are provided, and the first spiral conductor 2a and the first lead conductor 2b are connected to form one coil, and the second spiral conductor 3a and the second lead conductor 3b are connected to form another coil, and lead electrodes 4a and 4b are provided at the tip ends of the first and second spiral conductors 2a and 3a, respectively. It was. The lead electrodes 4a and 4b and the first and second lead conductors 2b and 3b were directly connected to external electrodes (not shown).

  As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.

JP 2005-150168 A

  In the above-described conventional common mode noise filter, when the product is downsized, the ratio of the place where the first and second spiral conductors 2a and 3a can be formed to the entire insulating layer increases. Therefore, the extraction electrode 4a The area of 4b is inevitably small, and if the area of the extraction electrodes 4a and 4b is small, the extraction electrodes 4a and 4b may be peeled off or torn when divided into individual pieces. There was a problem that connectivity deteriorated.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a common mode noise filter that can improve the connection reliability with an external electrode even if it is downsized.

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

  According to a first aspect of the present invention, the first spiral conductor, the first lead conductor connected to the first spiral conductor, and the first spiral conductor are opposed to each other. A second spiral conductor provided on the second spiral conductor, a second lead conductor connected to the second spiral conductor, and a first spiral conductor formed on one end of each of the first and second spiral conductors. 1, a second extraction electrode, a plurality of insulating layers including the first and second spiral conductors, the first and second extraction conductors, a main body having these, and a surface of the main body And the first and second lead electrodes are formed so as not to be exposed from the insulating layer, and are formed above and below the first and second lead electrodes, respectively. Providing a conductor penetrating the insulating layer and connecting the first and second extraction electrodes and the conductor; The lead conductors are connected to the first to fourth external electrodes, respectively. According to this configuration, the first and second lead electrodes are not exposed from the insulating layer. Even if the area of the second extraction electrode is reduced, it does not peel off or break at the time of division, and the first and second extraction electrodes are connected to the conductors formed above and below, respectively. Therefore, the connection area between the conductor connected to the external electrode and the first and second extraction electrodes can be widened, thereby improving the connection reliability between the first and second extraction electrodes and the external electrode. It has the effect that it can be improved.

  According to a second aspect of the present invention, the first spiral conductor, the third spiral conductor connected to the first spiral conductor, and the first spiral conductor are opposed to each other. A second spiral conductor provided on the first spiral conductor, a fourth spiral conductor connected to the second spiral conductor, and first ends formed on the first to fourth spiral conductors, respectively. 1st to 4th extraction electrode, a plurality of insulating layers provided with the 1st to 4th spiral conductors, a main body having these, and 1st to 4th provided on the surface of the main body An external electrode, the first to fourth extraction electrodes are not exposed from the insulating layer, and a conductor penetrating the insulating layers formed above and below each of the first to fourth extraction electrodes is provided, In addition, each of the first to fourth extraction electrodes is connected to the conductor, and each of the conductors is connected to the first to fourth exteriors. According to this configuration, since the first to fourth extraction electrodes are not exposed from the insulating layer, even if the area of the first to fourth extraction electrodes is reduced, The first and fourth extraction electrodes are connected to the conductors formed above and below the first and fourth extraction electrodes, so that the first and fourth conductors are connected to the external electrodes. The connection area between the fourth extraction electrode and the fourth extraction electrode can be widened, whereby the connection reliability between the first to fourth extraction electrodes and the external electrode can be improved. .

  According to the third aspect of the present invention, in particular, the width of the first and second lead electrodes is made wider than the width of the first and second spiral conductors. Since the connection area between the first and second extraction electrodes and the conductor can be increased, the connection reliability with the external electrode can be further improved.

  As described above, the common mode noise filter according to the present invention prevents the first and second extraction electrodes from being exposed from the insulating layer. Therefore, even if the area of the first and second extraction electrodes is reduced, it is divided. It is not sometimes peeled off or torn, and a conductor penetrating the insulating layers formed above and below each of the first and second lead electrodes is provided, and the first and second lead electrodes and the conductor are provided. Are connected to each other, and the conductor and the first and second lead conductors are connected to the first to fourth external electrodes, respectively, so that the first and second lead electrodes are formed above and below each other. Since the connection area between the conductor connected to the external electrode and the first and second extraction electrodes can be widened, the first and second extraction electrodes can be connected to the outside. Excellent effect of improving the connection reliability with the electrode It is intended to achieve the.

1 is an exploded perspective view of a common mode noise filter according to Embodiment 1 of the present invention. Perspective view of the common mode noise filter Top view showing the production status of the common mode noise filter Perspective top view showing a state during production of the common mode noise filter Cross-sectional perspective view of the main part of the common mode noise filter Top view showing the production status of the common mode noise filter Perspective top view showing a state during production of the common mode noise filter The disassembled perspective view of the common mode noise filter in Embodiment 2 of this invention Exploded perspective view of a conventional common mode noise filter

(Embodiment 1)
The invention according to the first and third aspects of the present invention will be described below with reference to the first embodiment.

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

  As shown in FIGS. 1 and 2, the common mode noise filter according to the first exemplary embodiment of the present invention includes a first spiral conductor 11 and a first extraction conductor connected to the first spiral conductor 11. A conductor 12, a second spiral conductor 13 provided so as to face the first spiral conductor 11, a second lead conductor 14 connected to the second spiral conductor 13, First and second extraction electrodes 15 and 16 formed at one end portions of the first and second spiral conductors 11 and 13, respectively, and the first and second spiral conductors 11 and 13, first The first to fifth insulating layers 17a to 17e provided with the second lead conductors 12 and 14, the main body 18 having these, and the first to fourth provided on the surface of the main body 18 The external electrodes 19 to 22 are provided.

  The first and second lead electrodes 15 and 16 are formed on the upper and lower sides of the first and second lead electrodes 15 and 16 so as not to be exposed from the first to fifth insulating layers 17a to 17e. A conductor 23 penetrating the first to fifth insulating layers 17a to 17e is provided, and the first and second extraction electrodes 15 and 16 and the conductor 23 are connected to each other. The second lead conductors 12 and 14 are connected to the first to fourth external electrodes 19 to 22, respectively.

  In the above configuration, the first spiral conductor 11 is formed by spirally plating a conductive material such as silver on the upper surface of the second insulating layer 17b. Further, a first extraction electrode 15 is formed at one end of the first spiral conductor 11.

  The first lead-out conductor 12 is formed by linearly plating a conductive material such as silver on the upper surface of the first insulating layer 17a. Then, the other end of the first spiral conductor 11 and the other end of the first lead conductor 12 are connected via a first via 24a formed in the second insulating layer 17b, so that one coil Is configured. Note that a third lead electrode 25 is formed at one end of the first lead conductor 12.

  Further, the second spiral conductor 13 is formed by plating a conductive material such as silver spirally on the upper surface of the third insulating layer 17c. Furthermore, a second extraction electrode 16 is formed at one end of the second spiral conductor 13.

  The first spiral conductor 11 and the second spiral conductor 13 are formed so as to be adjacent to each other in the vertical direction with the third insulating layer 17c interposed therebetween, and the second spiral conductor 13 is mostly composed of the first spiral conductor 11 and the second spiral conductor 13. Is opposed to the first spiral conductor 11 through the third insulating layer 17c so as to overlap in a top view. As a result, the first spiral conductor 11 and the second spiral conductor 13 exert a magnetic influence on each other, so that the magnetic force is generated between the first spiral conductor 11 and the second spiral conductor 13. As a result, the impedance of the common mode component can be increased.

  Further, the second lead conductor 14 is formed by linearly plating a conductive material such as silver on the upper surface of the fourth insulating layer 17d. Then, the other end of the second spiral conductor 13 and the other end of the second lead conductor 14 are connected via a second via 24b formed in the fourth insulating layer 17d, and another coil Is configured. A fourth extraction electrode 26 is formed at one end of the second extraction conductor 14.

  The first to fourth lead electrodes 15, 16, 25, 26 are not exposed from the first to fifth insulating layers 17a-17e, and the first and second spiral conductors 11, 13, The first and second lead conductors 12 and 14 are wider than the width.

  The first to fifth insulating layers 17a to 17e are formed in a sheet shape from a nonmagnetic material such as Cu-Zn ferrite and glass ceramics, and have insulating properties. Further, the first to fifth insulating layers 17a to 17e are laminated in order from the bottom, and are exposed on the side surfaces of the first to fifth insulating layers 17a to 17e at predetermined positions on the end surfaces, and A conductor 23 penetrating through the fifth insulating layers 17a to 17e is formed.

  The end face of the first insulating layer 17a is connected to the conductor 23 connected to the third lead electrode 25, and the end face of the second insulating layer 17b is connected to the first lead electrode 15 and the third lead electrode 25. The conductor 23 to be connected, the end face of the third insulating layer 17c is the first lead electrode 15, the conductor 23 connected to the second lead electrode 16, and the end face of the fourth insulating layer 17d is the second lead electrode. 16, a conductor 23 connected to the fourth lead electrode 26, and a conductor 23 connected to the fourth lead electrode 26 are formed on the end face of the fifth insulating layer 17e.

  As shown in FIG. 3, the conductor 23 is formed with a through hole so as to straddle the cutting line 27 before being divided into individual pieces, and the cutting line 27 is filled with a conductive material such as Ag after filling the through hole. It is formed by dividing it into individual pieces. The second spiral conductor 13 is formed after the through hole is filled with a conductive material such as Ag and before being divided into individual pieces. Then, as shown in FIG. 4, the second extraction electrode 16 connected to the second spiral conductor 13 is a conductive layer formed on the third insulating layer 17c on which the second spiral conductor 13 is formed. The body 23 and the conductor 23 formed on the fourth insulating layer 17d on the upper surface of the second spiral conductor 13 are sandwiched between the upper and lower surfaces of the second extraction electrode 16. It covers the part or the whole. 3 and 4, the second spiral conductor 13 and the fourth lead conductor 14 have been described, but the same applies to the first spiral conductor 11 and the second lead conductor 12. 3 shows the fourth lead conductor 14 at the same time, but the fourth lead conductor 14 is omitted in FIG.

  The first and second vias 24a and 24b are formed at predetermined positions of the second and fourth insulating layers 17b and 17d, respectively. The first and second vias 24a and 24b form holes penetrating the second insulating layer 17b and the fourth insulating layer 17d, respectively, and are filled with a conductor such as silver. It is configured by.

  Further, a magnetic layer 28 made of a sheet of insulating magnetic material such as Ni—Cu—Zn ferrite is formed on the lower surface of the first insulating layer 17 a and the upper surface of the fifth insulating layer 17 e.

  By laminating as described above, the main body portion 18 of the common mode noise filter is formed.

  A part or all of the first to fifth insulating layers 17a to 17e may be made of a magnetic material. Further, the number of the first to fifth insulating layers 17a to 17e and the magnetic layer 28 is not limited to the number shown in FIG.

  Further, as shown in FIG. 2, the main body portion 18 is provided with first to fourth external electrodes 19 to 22 on both end faces, and the first to fourth external electrodes 19 to 22 are The first extraction electrode 15 formed at one end of the first spiral conductor 11, the second extraction electrode 16 formed at one end of the second spiral conductor 13, and the first extraction conductor 12. The third lead electrode 25 formed at one end of the second lead electrode 25 and the fourth lead electrode 26 formed at one end of the second lead conductor 14 are respectively connected via a conductor 23. The first to fourth external electrodes 19 to 22 are formed by printing silver on the end face of the main body 18, and a nickel plating layer is formed on these surfaces by plating. A low melting point metal plating layer such as tin or solder is formed on the surface by plating.

  As described above, in the common mode noise filter according to the first embodiment of the present invention, the first and second extraction electrodes 15 and 16 are not exposed from the second and third insulating layers 17b and 17c. Even if the area of the first and second extraction electrodes 15 and 16 is reduced, the first and second extraction electrodes 15 and 16 are not peeled off or broken during the division, and are formed above and below the first and second extraction electrodes 15 and 16, respectively. The first through fourth insulating layers 17a to 17d are provided, and the first and second lead electrodes 15 and 16 and the conductor 23 are connected to each other. Since the first and second lead conductors 12 and 14 are connected to the first to fourth external electrodes 19 to 22, respectively, the first and second lead electrodes 15 and 16 are formed above and below each other. Connected to the conductor 23, Since the connection area between the conductor 23 connected to the external electrodes 19 and 20 and the first and second lead electrodes 15 and 16 can be increased, the connection reliability with the external electrodes can be improved. The effect is obtained.

  In other words, when the product is miniaturized, if the conductor is spiral, the proportion of the entire insulating layer in the area where the spiral conductor can be formed increases, so that the extraction electrode connected to the external electrode can be formed. Inevitably becomes small, and the area of the extraction electrode is reduced, so that the extraction electrode is peeled off or torn when divided into individual pieces. If the extraction electrodes 15 and 16 are not exposed from the second and third insulating layers 17b and 17c, the first and second extraction electrodes can be obtained even if the area of the first and second extraction electrodes 15 and 16 is small. Since the electrodes 15 and 16 are not cut, the extraction electrode is not damaged when divided into individual pieces. Further, a conductor 23 is formed on the upper and lower insulating layers 17a to 17d of the first and second lead electrodes 15 and 16, and the first and second lead lines are formed by the two conductors 23 as shown in FIG. Since the conductor 23 covers a part or all of the upper and lower surfaces of the first and second extraction electrodes 15 and 16 and the tip thereof with the electrodes 15 and 16 interposed therebetween, the conductor 23 and the first The connection area with the second extraction electrodes 15 and 16 can be increased. Since the external electrodes 19 and 20 are connected to the conductor 23 having the same thickness as the two insulating layers, the connection area between the external electrodes 19 and 20 and the conductor 23 can be increased. As a result, the connection reliability between the first and second extraction electrodes 15 and 16 and the external electrodes 19 and 20 is improved.

  Furthermore, if the conductor 23 is configured to cover the entire first and second extraction electrodes 15 and 16 in a top view, the connection area between the conductor 23 and the first and second extraction electrodes 15 and 16 can be further increased. Accordingly, the connection reliability between the first and second extraction electrodes 15 and 16 and the external electrodes 19 and 20 can be further improved.

  On the other hand, if the conductor is formed in a spiral shape, the area of the lead electrode can be increased if the area where the conductor is provided is made small (inside the insulating layer), but if high impedance is to be obtained, Increased, not suitable for miniaturization.

  Further, as described above, the first and second lead-out electrodes are formed by forming the lead electrodes 25 and 26 that are not exposed to the insulating layers 17a and 17d at one end portions of the first and second lead-out conductors 12 and 14, respectively. The connection reliability between the conductors 12 and 14 and the external electrodes 21 and 22 is also improved. Note that the extraction electrodes 25 and 26 that are not exposed to the insulating layers 17a and 17d are not necessarily formed at one end portions of the first and second extraction conductors 12 and 14, and in this case, the first and second extraction conductors 12 and 14 are not necessarily formed. The lead electrodes 25 and 26 exposed on the lead conductors 12 and 14 or the insulating layers 17a and 17d are directly connected to the external electrodes 21 and 22, respectively.

  As shown in FIGS. 6 and 7, extraction electrodes may be formed in the vicinity of the intersections of the vertical and horizontal cutting lines 27. In this case, the conductors 23 are formed at the four corners of the insulating layer.

  Furthermore, the width of the first and second extraction electrodes 15 and 16 may not be wider than the width of the first and second spiral conductors 11 and 13. Note that if the width is increased as described in the first embodiment of the present invention, the connection area between the first and second extraction electrodes 15 and 16 and the conductor 23 can be increased. The connection reliability with the electrodes 19 and 20 can be further improved, which is preferable.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment.

  FIG. 8 is an exploded perspective view of the common mode noise filter according to Embodiment 2 of the present invention. In the second embodiment of the present invention, components having the same configurations as those of the first embodiment of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

  The difference between the second embodiment of the present invention and the first embodiment of the present invention is that, as shown in FIG. 8, the first lead conductor 12 is spirally formed and the third spiral conductor 29 is formed. The fourth spiral conductor 30 is configured by configuring the second lead conductor 14 in a spiral shape.

  Further, the third spiral conductor 29 is formed above the second spiral conductor 13, the fourth spiral conductor 30 is formed below the first spiral conductor 11, and the first spiral conductor 29 is further formed. The second spiral conductor 13 is disposed between the spiral conductor 11 and the third spiral conductor 29, and the first spiral is interposed between the second spiral conductor 13 and the fourth spiral conductor 30. The conductor 11 is arranged.

  With such a configuration, the connection reliability with the first to fourth external electrodes 19 to 22 can be improved as in the first embodiment of the present invention, and the first spiral conductor is further provided. 11 and the second spiral conductor 13 as well as the first spiral conductor 11 and the fourth spiral conductor 30, and the second spiral conductor 13 and the third spiral conductor 29 are magnetically coupled. Therefore, the common mode noise removal characteristic can be improved.

  In the common mode noise filter according to the first and second embodiments of the present invention, the first to fourth spiral conductors 11, 13, 29, 30, the first and second lead conductors 12, 14 are provided. Although it formed by plating, you may form by other methods, such as printing and vapor deposition.

  The common mode noise filter according to the present invention has an effect that the connection reliability with the external electrode can be improved even if it is reduced in size, and in particular, various electronic devices such as digital devices, AV devices, and information communication terminals. This is useful in a common mode noise filter used as a noise countermeasure.

DESCRIPTION OF SYMBOLS 11 1st spiral conductor 12 1st extraction conductor 13 2nd spiral conductor 14 2nd extraction conductor 15 1st extraction electrode 16 2nd extraction electrode 17a-17e 1st-5th insulation Layer 18 Body 19-22 First to fourth external electrodes 23 Conductor 29 Third spiral conductor 30 Fourth spiral conductor

Claims (3)

A first spiral conductor, a first lead conductor connected to the first spiral conductor, a second spiral conductor provided to face the first spiral conductor, A second lead conductor connected to the second spiral conductor; first and second lead electrodes formed at one end of the first and second spiral conductors; A plurality of insulating layers including a second spiral conductor, first and second lead conductors, a main body having these, and first to fourth external electrodes provided on the surface of the main body The first and second lead electrodes are not exposed from the insulating layer, a conductor penetrating the insulating layers formed above and below each of the first and second lead electrodes is provided, and The first and second lead electrodes are connected to the conductor, and the conductor, the first and second lead conductors are connected to the first to fourth external power supplies. Common mode noise filter to be connected respectively to the. A first spiral conductor; a third spiral conductor connected to the first spiral conductor; a second spiral conductor provided to face the first spiral conductor; A fourth spiral conductor connected to the second spiral conductor; first to fourth extraction electrodes formed at one end portions of the first to fourth spiral conductors; and the first A plurality of insulating layers including a fourth spiral conductor, a main body having these, and first to fourth external electrodes provided on a surface of the main body, the first to fourth The lead electrode is not exposed from the insulating layer, a conductor penetrating the insulating layer formed above and below each of the first to fourth lead electrodes is provided, and each of the first to fourth lead electrodes is provided. A common module connected to the conductor and connected to the first to fourth external electrodes. De-noise filter. 2. The common mode noise filter according to claim 1, wherein the width of the first and second extraction electrodes is wider than the width of the first and second spiral conductors.

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