JP2010062986A - Mounting structure for noise-proof component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure for a noise-proof component which can reduce not only noise transmissivity but also noise reflectance. <P>SOLUTION: A noise-proof component 1 comprises four L-shaped filter composed of: input-side external electrodes 3-1 (3-2 to 3-4); an input-side drawing electrode 40; coil bodies 4-1 (4-2 to 4-4); capacitors 5-1 (5-2 to 5-4), an output-side drawing electrode 50; and output-side external electrodes 3-1' (3-2' to 3-4'). On a wiring board 100, there are provided input-side signal wiring 101-104, output-side signal wiring 101-104, ground wiring 111, 112 and a plane conductor 10. The plane conductor 10 is set to a size including the coil bodies 4-1 to 4-4. The plane conductor 10 opposes the input-side drawing electrode 40 at a lower side of the coil bodies 4-1 to 4-4, and capacitance C is generated by the plane conductor 10 and the input-side drawing electrode 40. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mounting structure of a noise countermeasure component for removing noise that has entered a signal wiring.

In order to prevent reception sensitivity deterioration in a wireless communication device such as a cellular phone, it is necessary to effectively remove noise that has entered the signal wiring on the wiring board.
As a technique for removing such noise, for example, in a wireless communication device, a method of mounting a noise filter, which is a noise countermeasure component having a large insertion loss in a frequency band used for communication, on a signal wiring on which noise is superimposed There is.
And as a structure which mounts a noise countermeasure component in this way, there exists a technique disclosed by patent document 1, for example.
In this technology, in a noise filter in which inductors and capacitors are laminated, the noise filter is mounted on the wiring board so that the capacitor is located on the wiring board side, so that the ground terminal electrode that is the capacitor electrode and the ground pattern of the wiring board The distance is minimized.
With this structure, the distance between the capacitor electrode and the grounding land on the wiring board can be shortened. As a result, the impedance (inductance) generated between the capacitor electrode and the grounding land is reduced to suppress the deterioration of the insertion loss of the noise filter.

Japanese Utility Model Publication No. 05-076027

However, the conventional techniques described above have the following problems.
In the mounting structure of the noise countermeasure component described above, the insertion loss with respect to noise, that is, the noise transmittance can be reduced, but the noise reflectance cannot be reduced.
That is, in a system that is vulnerable to noise interference in a device such as a mobile phone, the noise reflected by the noise filter also greatly affects the performance of the device. Therefore, in order to surely prevent troubles in the equipment due to noise, it is necessary not only to attenuate the noise in the noise countermeasure component but also to suppress the noise reflectivity in the noise countermeasure component.
However, in the above-described conventional mounting structure for noise countermeasure components, no measures are taken to reduce the reflectance of noise, and noise cannot be sufficiently removed.

  The present invention has been made to solve the above-described problems, and provides a mounting structure for a noise countermeasure component that not only can reduce the noise transmittance but also can reduce the noise reflectance. Objective.

In order to solve the above problems, the invention of claim 1 is characterized in that the insulator and the input-side extraction electrode at the lower end are exposed on the front surface of the insulator and the output-side extraction electrode is exposed on the rear surface. N number of coil bodies housed side by side, n number of input side external electrodes provided on the front surface of the insulator and electrically connected to n number of input side lead electrodes, respectively, and provided on the rear surface of the insulator And a noise countermeasure component mounting structure for mounting a noise countermeasure component having n number of output side external electrodes electrically connected to n number of output side extraction electrodes on the signal wiring of the wiring board. Then, each input-side extraction electrode of each coil body is extracted in parallel to the lower surface of the insulator, and one planar conductor is connected to the n number of input-side extraction electrodes in a region on the wiring board on which the noise countermeasure component is mounted. To face A configuration in which disposed.
With this configuration, when the noise countermeasure component is mounted on the signal wiring of the wiring board, the noise that has entered the signal wiring is input to the input-side lead electrode connected to the signal wiring through the input-side external electrode. Then, the noise is attenuated by the coil body of the input side extraction electrode, and is slightly output from the output side extraction electrode to the signal wiring through the output side external electrode. Therefore, the noise transmittance by this noise countermeasure component is very small.
By the way, a part of the noise that has entered the signal wiring is input from the input-side external electrode to the input-side extraction electrode, then reflected by this electrode, returns to the original signal wiring, and may adversely affect other devices. There is.
However, in the mounting structure of the noise countermeasure component of the present invention, each input-side lead electrode of each coil body is pulled out parallel to the lower surface of the insulator, and in the region on the wiring board on which the noise countermeasure component is mounted, Since the planar conductor is disposed so as to face the input-side extraction electrode, a capacitance is generated between each input-side extraction electrode and the planar conductor. Since one planar conductor faces n input-side extraction electrodes, the n number of input-side extraction electrodes are connected to each other by the capacitance between the input-side extraction electrode and the planar conductor. Become. As a result, noise that has entered the input-side extraction electrode from the signal wiring enters the other input-side extraction electrode through the capacitor, is sent into another coil body, and is attenuated by the inductance.
In this way, noise input from the signal wiring to the input-side extraction electrode is attenuated by another coil body without being reflected by this electrode, so that the amount of reflected noise is very small.

According to a second aspect of the present invention, in the mounting structure of the noise countermeasure component according to the first aspect, all the coil bodies are accommodated in the insulator in the vertical direction of the insulator, and the size of the planar conductor on the wiring board is increased. The size is set so that the planar conductor faces the lower end surfaces of all the coil bodies.
With this configuration, the magnetic field generated from the coil body housed in the insulator in the vertical direction of the insulator is shielded by the flat conductor facing the lower end surface of the coil body.

According to a third aspect of the present invention, in the noise countermeasure component mounting structure according to the first or second aspect, the planar conductor is in a non-grounded state.
With such a configuration, since the planar conductor is not grounded, the capacitance generated between each input-side extraction electrode and the planar conductor can be increased.

According to a fourth aspect of the present invention, in the noise countermeasure component mounting structure according to any one of the first to third aspects, one end is connected to an intermediate portion of the output-side lead electrode of each coil body and the other end is insulated. A capacitor exposed on the side surface of the body is provided in the insulator, and an external ground electrode that is electrically connected to the other end of the capacitor is provided on the side surface of the insulator. The ground external electrode is connected to the ground wiring provided on the wiring board.
With this configuration, noise input from the signal wiring to the input-side extraction electrode through the input-side external electrode is attenuated by the coil body of the input-side extraction electrode. The noise output from the coil body to the output-side extraction electrode is input to a capacitor connected to the middle portion of the output-side extraction electrode, and flows out to the ground wiring through the ground external electrode.

According to a fifth aspect of the present invention, in the noise countermeasure component mounting structure according to any one of the first to third aspects, each input side end is connected to an output side end of each coil body and each output side lead is A separate coil body with the electrode exposed on the rear surface of the insulator is provided in the insulator, and each output-side extraction electrode is pulled out in parallel to the lower surface of the insulator, and the output-side external electrode is pulled out to the output-side A capacitor electrically connected to the electrode and having one end connected to a connection portion between the coil body and the separate coil body and the other end exposed on the side surface of the insulator is provided in the insulator, and the other end of the capacitor The ground external electrode that is electrically connected to the end is provided on the side surface of the insulator, so that n number of T-type filters are formed in the noise countermeasure component, and the ground external electrode is provided on the ground wiring provided on the wiring board. When connected The size of the planar conductor on the wiring board, a structure in which the planar conductor is set to a size such as is opposite to the output side lead electrode of the coil body separate.
With this configuration, it is possible not only to reduce the reflection amount of noise input from the input side extraction electrode side, but also to reduce the reflection amount of noise input from the output side extraction electrode side.

  As described above in detail, according to the mounting structure of the noise countermeasure component according to the first to fifth aspects of the present invention, noise can be reduced by the capacitance generated between the planar conductor and the input-side extraction electrode of the coil body. The amount of reflection of noise can be reduced by inputting to the coil body, so that not only the noise transmittance can be reduced, but also the noise reflectance can be reduced, resulting in an improved noise removal effect There is an excellent effect that can be achieved.

  In particular, according to the invention of claim 2, since the magnetic field emitted from the coil body can be shielded by the planar conductor, magnetic coupling to the signal wiring on the wiring board can be prevented. As a result, there is an effect that noise due to the magnetic field can be prevented from propagating to the entire circuit on the wiring board.

  According to the invention of claim 3, since the capacitance generated between each input-side extraction electrode and the planar conductor can be increased, the noise reflectance can be further reduced, and the noise removal effect can be further improved. Can be achieved.

  The best mode of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing a mounting structure of a noise countermeasure component according to a first embodiment of the present invention, FIG. 2 is a perspective view showing the noise countermeasure component removed from a wiring board, and FIG. It is a perspective view which decomposes | disassembles and shows 2 noise countermeasure components.

The mounting structure of the noise countermeasure component of this embodiment is a structure in which the noise countermeasure component 1 is mounted on the wiring board 100 as shown in FIG.
That is, as shown in FIG. 2, the noise countermeasure component 1 has four input-side external electrodes 3-1 to 3-4 on the front surface 2a of the insulator 2, and four output-side external electrodes facing these electrodes. Electrodes 3-1 ′ to 3-4 ′ are provided on the rear surface 2b, and ground external electrodes 3-5 and 3-6 are provided on both side surfaces 2c and 2c of the insulator 2. Such a noise countermeasure component 1 is located immediately above the planar conductor 10 on the wiring board 100, and the input-side external electrodes 3-1 to 3-4 have four signal wires 101 to 104 on the input side. Output-side external electrodes 3-1 ′ to 3-4 ′ are connected to the four output-side signal wirings 101 to 104, and ground external electrodes 3-5 and 3-6 are connected to the ground wiring 111. , 112.

As shown in FIG. 3, the noise countermeasure component 1 houses four coil bodies 4-1 to 4-4 and four capacitors 5-1 to 5-4.
Specifically, the insulator 2 is formed of eight insulating layers 21 to 28, and the lowest ring-shaped conductor pattern 41 of each coil body 4-1 (4-2 to 4-4) is formed on the insulating layer 21. The ring-shaped conductor pattern 42 formed thereon is formed on the insulating layer 22, and the uppermost ring-shaped conductor pattern 43 is formed on the insulating layer 23.
The leading end portion 41 b of the conductor pattern 41 is connected to the base end portion 42 a of the conductor pattern 42 through the via hole 22 a formed in the insulating layer 22, and the leading end portion 42 b of the conductor pattern 42 is formed in the insulating layer 23. It is connected to the base end part 43a of the conductor pattern 43 through 23a. Thereby, all the coil bodies 4-1 to 4-4 are formed in a spiral in the insulator 2, and the coil bodies 4-1 to 4-4 are arranged in the insulator 2 in a state in which they are oriented in the vertical direction. They are stored side by side.

In such a state, the base end portion 41a of the conductor pattern 41 becomes the lower end of each coil body 4-1 (4-2 to 4-4), and the input-side lead electrode 40 is pulled out from the base end portion 41a. The tip is exposed on the front surface 2a of the insulator 2 (see FIG. 2).
Specifically, each input-side lead electrode 40 of each coil body 4-1 (4-2 to 4-4) is drawn parallel to the lower surface 2d of the insulator 2, and the tip exposed from the front surface 2a is The input-side external electrodes 3-1 (3-2 to 3-4) are electrically connected.
Further, the leading end portion 43 b of the conductor pattern 43 is connected to an electrode 51 described later through a via hole 24 a formed in the insulating layer 24. Then, the output-side extraction electrode 50 is extracted from the electrode 51, and its tip is exposed on the rear surface 2b (see FIG. 2) of the insulator 2, and this tip is connected to each output-side external electrode 3-1 ′ (3-2). ′ To 3-4 ′).

Each capacitor 5-1 (5-2 to 5-4) includes an electrode 51 and a common ground electrode 52 having a large area. In this embodiment, two sets of these electrodes 51 and ground electrodes 52 are provided, and the electrodes 51 and the ground electrodes 52 are opposed to each other and arranged alternately, whereby each capacitor 5-1 (5-2 to 5-4) is provided. Configured.
Specifically, the lower four electrodes 51 of the capacitors 5-1 to 5-4 are formed on the insulating layer 24, and one ground electrode 52 is formed on the insulating layer 25. Similarly, the upper four electrodes 51 are formed on the insulating layer 26, and one ground electrode 52 is formed on the insulating layer 27. Then, both extraction electrodes 52a and 52b of the ground electrode 52 on the insulating layers 25 and 27 are extracted to both sides, and these extraction electrodes 52a and 52b are connected to the ground external electrodes 3-5 and 3-6.

FIG. 4 is an equivalent circuit diagram of the noise countermeasure component 1.
As shown in FIGS. 1 to 3, each capacitor 5-1 (5-2 to 5-4) is provided in the middle of the output-side extraction electrode 50 of each coil body 4-1 (4-2 to 4-4). The electrode 51 which is one end of the ground electrode 52 is connected, and the lead electrodes 52a and 52b of the ground electrode 52 which is the other end are connected to the ground external electrodes 3-5 and 3-6.
Therefore, each input side external electrode 3-1 (3-2 to 3-4), the input side lead electrode 40, each coil body 4-1 (4-2 to 4-4), and each capacitor 5-1 (5- 2-5-4), the output-side extraction electrode 50, and the output-side external electrodes 3-1 ′ (3-2 ′ to 3-4 ′) are equivalent to the circuit shown in FIG. An L-type filter is configured. That is, in the noise countermeasure component 1 of this embodiment, four L-type filters are formed in the insulator 2.

5 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 6 is a cross-sectional view taken along the line BB in FIG.
On the other hand, on the wiring board 100, as shown in FIGS. 2 and 3, the four signal wirings 101 to 104 on the input side, the four signal wirings 101 to 104 on the output side, and the ground wirings 111 and 112, Is provided. One planar conductor 10 is provided in a region where the noise countermeasure component 1 is mounted on these wirings, that is, a position directly below the noise countermeasure component 1 to be mounted.

  As shown in FIG. 5, the planar conductor 10 is a rectangular conductor pattern connected to a solid ground layer 120 provided on the back surface side of the wiring board 100 through a via hole 121. The size is set to include the coil bodies 4-1 to 4-4. Further, as shown in FIG. 6, the planar conductor 10 is set to a size located below the input-side extraction electrodes 40 of all the coil bodies 4-1 to 4-4.

As shown in FIG. 6, the four input side external electrodes 3-1 to 3-4 of the noise countermeasure component 1 are connected to the four signal wirings 101 to 104 on the input side, and the four output side external electrodes are connected. 3-1 ′ to 3-4 ′ are connected to the four signal wirings 101 to 104 on the output side. Then, as shown in FIG. 5, the ground external electrodes 3-5 and 3-6 are connected to the ground wirings 111 and 112, so that the noise countermeasure component 1 is positioned directly above the planar conductor 10. Thereby, the lower end surfaces of all the coil bodies 4-1 to 4-4 are opposed to the planar conductor 10, and all the input side extraction electrodes 40 are opposed to the planar conductor 10.
FIG. 7 is an enlarged view of a portion surrounded by a broken line in FIG. 6, and FIG. 8 is an equivalent circuit diagram of the mounting structure of the noise countermeasure component 1 of this embodiment.
As shown in FIG. 7, the input-side extraction electrode 40 faces the planar conductor 10, so that a capacitance C is generated between the input-side extraction electrode 40 and the planar conductor 10. As a result, the mounting structure of the noise countermeasure component 1 is equivalent to the circuit shown in FIG.

Next, the operation and effect of the mounting structure of the noise countermeasure component 1 of this embodiment will be described.
FIG. 9 is an equivalent circuit diagram for explaining the operation and effect of the mounting structure of the noise countermeasure component 1 of this embodiment.
In the mounting state shown in FIG. 1, when noise N is input from the signal wiring 101 to the input-side extraction electrode 40 through the input-side external electrode 3-1, the noise N is extracted from the input-side extraction as shown by the arrows in FIG. The signal is input to the coil body 4-1 through the electrode 40 and is attenuated by the coil body 4-1. The noise N that has passed through the coil body 4-1 is input to the capacitor 5-1 connected in front of the output-side extraction electrode 50, and the ground wirings 111 and 112 are connected through the ground external electrodes 3-5 and 3-6. (See FIGS. 2 and 3). That is, the noise N input to the noise countermeasure component 1 from the signal wiring 101 is attenuated by the L-type filter composed of the coil body 4-1 and the capacitor 5-1. As a result, the noise N that passes through the noise countermeasure component 1 from the input-side signal wiring 101 and is output to the output-side signal wiring 101 is small, and the noise transmittance of the noise countermeasure component 1 is extremely small.

Of the noise N that has entered the input-side external electrode 3-1 from the signal wiring 101, noise n that cannot be input to the coil body 4-1 and is reflected by the input-side extraction electrode 40 is generated.
However, in this embodiment, as described above, a capacitance C is generated between the input-side extraction electrodes 40 of the coil bodies 4-1 to 4-4 and the planar conductor 10, and the four input-side extraction electrodes 40 are connected to each other. However, the capacitor C is in a connected state. For this reason, the noise n reflected by the input-side extraction electrode 40 of the coil body 4-1 is input to another L-type filter through the capacitor C. That is, the noise n includes an L-type filter composed of a coil body 4-2 and a capacitor 5-2, an L-type filter composed of a coil body 4-3 and a capacitor 5-3, and a coil body 4-4. Any or all of the L-type filters configured with the capacitors 5-4 are input through the capacitance C and attenuated in each L-type filter.
As described above, the noise that has entered the input-side extraction electrode 40 from the signal wiring 101 through the input-side external electrode 3-1 is hardly reflected and attenuated by another L-type filter. Very few.

FIG. 10 is a cross-sectional view for explaining the magnetic field shielding action of the planar conductor 10.
When a signal or noise flows through the coil bodies 4-1 to 4-4 of the noise countermeasure component 1, a magnetic field H is generated from the coil bodies 4-1 to 4-4 as shown by broken lines in FIG. The magnetic field H may be magnetically coupled to the signal wirings 101 to 104 (see FIGS. 1 to 3) on the wiring substrate 100 and a circuit (not shown).
However, in this embodiment, the planar conductor 10 is opposed to the lower end surfaces of all the coil bodies 4-1 to 4-4 facing in the vertical direction. Therefore, the magnetic field H directed downward from the coil bodies 4-1 to 4-4 is almost completely shielded by the planar conductor 10.

As described above, according to the mounting structure of the noise countermeasure component 1 of this embodiment, since the amount of reflected noise can be reduced, not only the noise transmittance can be reduced but also the noise reflectance can be reduced. As a result, the noise removal effect can be improved.
Furthermore, the magnetic field H emitted from the coil bodies 4-1 to 4-4 can be shielded by the planar conductor 10, and magnetic coupling to the signal wirings 101 to 104 on the wiring substrate 100 can be prevented.

The inventor conducted the following simulation in order to confirm the effect of reducing the noise reflectance.
FIG. 11 is a diagram showing a simulation result of noise transmittance, and FIG. 12 is a diagram showing a simulation result of noise reflectance.
First, the noise countermeasure component 1 is mounted on the wiring substrate 100 without providing the planar conductor 10 on the wiring substrate 100 shown in FIG. 2, and noise is input to the noise countermeasure component 1 in the range of 30 MHz to 2 GHz. When the transmittance of this noise was calculated, a result as shown by a curve S1 in FIG. 11 was obtained.
Next, the planar conductor 10 is provided on the wiring board 100, the noise countermeasure component 1 is mounted on the wiring substrate 100, noise is input to the noise countermeasure component 1 in the range of 30 MHz to 2 GHz, and the noise transmittance is increased. As a result, a result as shown by a curve S2 in FIG. 11 was obtained.
From this result, the inventor confirmed that the noise transmittance in the mounting structure provided with the planar conductor 10 was smaller than the noise transmittance in the mounting structure not provided with the planar conductor 10.

Then, under the same conditions, the noise reflectance in the mounting structure without the planar conductor 10 was calculated. As a result, a result like the curve S1 in FIG. 12 was obtained, and the noise reflectance in the mounting structure with the planar conductor 10 was obtained. As a result of calculation, a result as shown by a curve S2 in FIG. 12 was obtained.
From this result, the inventor confirmed that the noise reflectance in the mounting structure provided with the planar conductor 10 is considerably smaller than the noise reflectance in the mounting structure not provided with the planar conductor 10.

Next explained is the second embodiment of the invention.
13 is a cross-sectional view corresponding to FIG. 5 showing the mounting structure of the noise countermeasure component 1 according to the second embodiment of the present invention, and FIG. 14 is a cross-sectional view corresponding to FIG.
In the first embodiment, as shown in FIGS. 5 and 6, the planar conductor 10 is connected to the ground layer 120 provided on the back side of the wiring substrate 100 through the via hole 121 to be in a ground state. In this embodiment, as shown in FIGS. 13 and 14, the planar conductor 10 is not connected to the ground layer 120 and is not grounded.

  Thus, the capacitance C generated between each input-side extraction electrode 40 and the planar conductor 10 can be increased by bringing the planar conductor 10 into a non-grounded state. Thereby, noise transmittance and noise reflectance can be further reduced.

The inventor performed the following simulation in order to confirm the effect of reducing the noise reflectance in the second embodiment.
FIG. 15 is a diagram showing a simulation result of noise transmittance, and FIG. 16 is a diagram showing a simulation result of noise reflectance.
First, noise is input to the noise countermeasure component 1 mounted on the wiring board 100 not provided with the planar conductor 10 in the range of 30 MHz to 2 GHz, and the transmittance of this noise is calculated. As a result, the result as shown by the curve S1 in FIG. Got.
Next, the noise countermeasure component 1 is mounted on the wiring board 100 provided with the planar conductor 10 and the planar conductor 10 is not grounded, and noise is input to the noise countermeasure component 1 in the range of 30 MHz to 2 GHz, When the transmittance of this noise was calculated, a result as shown by a curve S3 in FIG. 15 was obtained.
From this result, the inventor found that the noise transmittance in the mounting structure in which the planar conductor 10 is provided and the planar conductor 10 is not grounded is less than the noise transmittance in the mounting structure in which the planar conductor 10 is not provided. It was confirmed that it became smaller. Furthermore, when compared with the curve S2 of FIG. 11, the noise transmittance in the mounting structure in which the planar conductor 10 is provided and the planar conductor 10 is in the non-grounded state is provided with the planar conductor 10 and the planar conductor 10 in the grounded state. It was confirmed that it was smaller than the noise transmittance in the mounted structure.

And when the noise reflectance in the mounting structure where the planar conductor 10 is not provided is calculated under the same conditions, a result as shown by a curve S1 in FIG. 16 is obtained. The planar conductor 10 is provided and the planar conductor 10 is not grounded. When the noise reflectance in the mounted structure was calculated, a result as shown by a curve S3 in FIG. 16 was obtained.
From this result, the inventor found that the noise reflectance in the mounting structure in which the planar conductor 10 is provided and the planar conductor 10 is not grounded is less than the noise reflectance in the mounting structure in which the planar conductor 10 is not provided. It was confirmed that it became smaller. Furthermore, when compared with the curve S2 in FIG. 12, the noise reflectance in the mounting structure in which the planar conductor 10 is provided and the planar conductor 10 is in the non-grounded state is provided with the planar conductor 10 and the planar conductor 10 in the grounded state. It was confirmed that it was smaller than the noise reflectance in the mounted structure.
Since other configurations, operations, and effects are the same as those in the first embodiment, description thereof is omitted.

Next explained is the third embodiment of the invention.
FIG. 17 is an exploded perspective view showing a noise countermeasure component which is a main part of the mounting structure of the noise countermeasure component according to the third embodiment of the present invention.
This embodiment is different from the first embodiment in that four T-type filters are configured in the noise countermeasure component.
As shown in FIG. 17, the noise countermeasure component 1 ′ includes coil bodies 4-1 to 4-4 and coil bodies 4-1 ′ to 4-4 ′ that are separate from the coil bodies 4-1 to 4-4. And four capacitors 5-1 'to 5-4'.
Each coil body 4-1 ′ (4-2 ′ to 4-4 ′) has the same structure as each coil body 4-1 (4-2 to 4-4), and each coil body 4-1 (4- 2-4-4) is rotated 180 ° with respect to the central axis.
Specifically, the lowermost conductor pattern 41 'of each coil body 4-1' (4-2 'to 4-4') is formed on the insulating layer 21, and the conductor pattern 42 'thereon is an insulating layer. The uppermost conductor pattern 43 ′ is formed on the insulating layer 23.
The leading end portion 41b 'of the conductor pattern 41' is connected to the base end portion 42a 'of the conductor pattern 42' through a via hole formed in the insulating layer 22, and the leading end portion 42b 'of the conductor pattern 42' is connected to the insulating layer 23. It is connected to the base end portion 43a 'of the conductor pattern 43' through a via hole formed in the conductor pattern 43 '. As a result, the spiral coil bodies 4-1 ′ (4-2 ′ to 4-4 ′) are arranged next to the coil bodies 4-1 (4-2 to 4-4). Yes.

In such a state, the base end portion 41a 'of the conductor pattern 41' becomes the lower end of each coil body 4-1 '(4-2' to 4-4 '), and the output-side extraction electrode 50 is connected to the base end portion 41a. ′, And the tip thereof is exposed on the rear surface 2 b of the insulator 2.
Specifically, each output-side extraction electrode 50 of each coil body 4-1 ′ (4-2 ′ to 4-4 ′) is extracted in parallel to the lower surface 2d of the insulator 2 and exposed from the rear surface 2b. The tip is electrically connected to each output-side external electrode 3-1 ′ (3-2 ′ to 3-4 ′).
Further, the tip end portion 43 b ′ of the conductor pattern 43 ′ is connected to an electrode 51 ′ described later through a via hole formed in the insulating layer 24. And the front-end | tip part 43b of the conductor pattern 43 of each coil body 4-1 (4-2-4-4) is also connected to the said electrode 51 '. That is, the tip end portion 43 b ′ that is the input side end of each coil body 4-1 ′ (4-2 to 4-4 ′) passes through the electrode 51, and each coil body 4-1 (4-2 to 4-4) It is in a state of being connected to the tip portion 43b which is the output side end portion of 4).

Each capacitor 5-1 ′ (5-2 ′ to 5-4 ′) includes an electrode 51 ′ and a common ground electrode 52 ′ having a large area.
Specifically, four electrodes 51 ′ of capacitors 5-1 ′ to 5-4 ′ are formed on the insulating layer 24, and one ground electrode 52 ′ is formed on the insulating layer 25. The lead electrodes 52a 'and 52b' of the ground electrode 52 'are led out to both sides, and the lead electrodes 52a' and 52b 'are connected to the ground external electrodes 3-5 and 3-6.

FIG. 18 is an equivalent circuit diagram of the mounting structure of the noise countermeasure component 1 ′ of this embodiment.
As shown in FIG. 17, the electrode 51 'which is one end of each capacitor 5-1' (5-2 'to 5-4') is connected to each coil body 4-1 (4-2 to 4-4). Are connected to the connecting portions of the coil bodies 4-1 ′ (4-2 ′ to 4-4 ′), and the lead electrodes 52a and 52b of the ground electrode 52 at the other end are connected to the ground external electrodes 3-5 and 5-5. It is connected to 3-6.
Therefore, each input side external electrode 3-1 (3-2 to 3-4), the input side lead electrode 40, each coil body 4-1 (4-2 to 4-4), and each capacitor 5-1 (5- 2-5-4), each coil body 4-1 '(4-2'-4-4'), the output side extraction electrode 50, and each output side external electrode 3-1 '(3-2'-3-4). The structure ′) is equivalent to a circuit as shown in FIG. 18, and constitutes a T-type filter. That is, in the noise countermeasure component 1 ′ of this embodiment, four T-type filters are configured in the insulator 2.

As shown in FIG. 17, the noise countermeasure component 1 ′ having such a structure is also mounted on the signal wirings 101 to 104 and the ground wirings 111 and 112 on the wiring board 100, and the planar conductor 10 ′ is directly below the noise countermeasure component 1 ′. Will be located.
The size of the planar conductor 10 'is set larger than that of the planar conductor 10 of the first embodiment by the area where the coil bodies 4-1' to 4-4 'are provided. As a result, the planar conductor 10 ′ faces not only the lower surfaces of the coil bodies 4-1 to 4-4 but also the lower surfaces of the coil bodies 4-1 ′ to 4-4 ′. It faces not only the 4-4 input-side extraction electrode 40 but also the output-side extraction electrodes 50 of the coil bodies 4-1 'to 4-4'. As a result, a capacitance C ′ is also generated between the planar conductor 10 ′ and the output-side extraction electrode 50.

With this configuration, as shown in FIG. 18, not only can the amount of reflection of noise N input from the input-side extraction electrode 40 side of each coil body 4-1 (4-2 to 4-4) be reduced, The amount of reflection of the noise N ′ input from the output side extraction electrode 50 side of each coil body 4-1 ′ (4-2 ′ to 4-4 ′) can also be reduced.
Other configurations, operations, and effects are the same as those in the first and second embodiments, and thus description thereof is omitted.

In addition, this invention is not limited to the said Example, A various deformation | transformation and change are possible within the range of the summary of invention.
For example, in the first to third embodiments, the noise countermeasure component as the filter provided with the capacitors 5-1 to 5-4, 5-1 'to 5-4' has been described. Needless to say, a mounting structure of a noise countermeasure component which is not provided with 5-4, 5-1 'to 5-4' but is constituted only by a coil body is also included in the scope of the present invention.

It is a perspective view which shows the mounting structure of the noise countermeasure component which concerns on 1st Example of this invention. It is a perspective view which removes and shows a noise countermeasure component from a wiring board. It is a perspective view which decomposes | disassembles and shows the noise countermeasure component of FIG. It is an equivalent circuit diagram of noise countermeasure components. It is arrow AA sectional drawing of FIG. It is arrow BB sectional drawing of FIG. FIG. 7 is an enlarged view of a portion surrounded by a broken line in FIG. 6. It is an equivalent circuit diagram of the mounting structure of the noise countermeasure component of the first embodiment. It is an equivalent circuit diagram for demonstrating the effect | action and effect which the mounting structure of the noise countermeasure component of 1st Example shows. It is sectional drawing for demonstrating the magnetic field shielding effect | action of a plane conductor. It is a diagram which shows the simulation result of noise transmittance. It is a diagram which shows the simulation result of a noise reflectance. FIG. 6 is a cross-sectional view corresponding to FIG. 5 showing the mounting structure of the noise countermeasure component according to the second embodiment of the present invention. It is sectional drawing corresponding to FIG. It is a diagram which shows the simulation result of noise transmittance. It is a diagram which shows the simulation result of a noise reflectance. It is a perspective view which decomposes | disassembles and shows the noise countermeasure component which is the principal part of the mounting structure of the noise countermeasure component which concerns on 3rd Example of this invention. It is the equivalent circuit schematic of the mounting structure of the noise countermeasure component of 3rd Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1 '... Noise suppression component, 2 ... Insulator, 2a ... Front surface, 2b ... Rear surface, 2c ... Side surface, 2d ... Bottom surface, 3-5, 3-6 ... External electrode for ground, 3-1 to 3-4 ... Input-side external electrodes, 3-1 'to 3-4' ... Output-side external electrodes, 4-1 to 4-4, 4-1 'to 4-4' ... Coil bodies, 5-1 to 5-4 5-1 'to 5-4' ... capacitor, 10, 10 '... planar conductor, 21-28 ... insulating layer, 22a-24a ... via hole, 40 ... input-side extraction electrode 40, 41-43, 41'-43' ... Conductor pattern, 41a to 43a, 41a 'to 43a' ... Base end, 41b to 43b, 41b 'to 43b' ... Tip, 50 ... Output-side extraction electrode, 51 ... Electrode, 52 ... Ground electrode, 52a, 52b , 52a ', 52b' ... extraction electrode, 101-10 ... signal line, 111, 112 ... ground wire, 120 ... ground layer 121 ... hole, C, C '... capacity.

Claims (5)

Insulator and n number (n is an integer of 2 or more) stored side by side in this insulator with the input lead electrode at the lower end exposed on the front face of the insulator and the output lead electrode exposed on the rear face A coil body, n number of input side external electrodes provided on the front surface of the insulator and electrically connected to the n number of input side lead electrodes, respectively, and n number of the above described external electrodes provided on the rear surface of the insulator. A noise countermeasure component mounting structure for mounting a noise countermeasure component having n number of output side external electrodes electrically connected to the output side lead electrode on the signal wiring of the wiring board,
Each input-side extraction electrode of each coil body is extracted in parallel to the lower surface of the insulator,
In the region on the wiring board on which the noise countermeasure component is mounted, one planar conductor is disposed so as to face the n number of input side extraction electrodes.
A mounting structure for noise suppression components. In the mounting structure of the noise countermeasure component according to claim 1,
While storing all the coil bodies in the insulator in the vertical direction of the insulator,
The size of the planar conductor on the wiring board was set to a size where the planar conductor faces the lower end surfaces of all the coil bodies,
A mounting structure for noise suppression components. In the mounting structure of the noise countermeasure component according to claim 1 or 2,
The planar conductor was ungrounded,
A mounting structure for noise suppression components. In the mounting structure of the noise countermeasure component according to any one of claims 1 to 3,
A capacitor having one end connected to the middle portion of the output-side lead electrode of each coil body and the other end exposed on the side surface of the insulator is provided in the insulator and is electrically connected to the other end of the capacitor. By providing external electrodes for the above side surfaces of the insulator,
N number of L-type filters are configured in the noise suppression component,
The ground external electrode was connected to a ground wiring provided on the wiring board.
A mounting structure for noise suppression components. In the mounting structure of the noise countermeasure component according to any one of claims 1 to 3,
A separate coil body, in which each input side end is connected to the output side end of each coil body and each output side lead electrode is exposed on the rear surface of the insulator, is provided in the insulator, and each output side lead is provided. An electrode is pulled out parallel to the lower surface of the insulator, the output-side external electrode is electrically connected to the output-side lead electrode, and one end is connected to a connection portion between the coil body and a separate coil body. Is provided in the insulator, and a ground external electrode that is electrically connected to the other end of the capacitor is provided on the side surface of the insulator. Configure n number of T-type filters in the noise countermeasure component,
The ground external electrode is connected to the ground wiring provided on the wiring board, and the size of the planar conductor on the wiring board is set so that the planar conductor faces the output-side extraction electrode of the separate coil body. Set the size to
A mounting structure for noise suppression components.

Images