JP2000003813A - Laminated inductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate irregularities in L value, which is due to the arrangement and restrain decrease in Q-value, in a laminated inductor, which is mounted on a high frequency circuit boards of a mobile radio communication apparatus or the like. SOLUTION: Each lead-out conductor 5a is positioned almost at the central part of an inductor section viewed from an external electrode direction, and a coil 5a surronds the position of the lead-out conductor. Thereby, even if the mounting state of an laminated inductor 1 is changed (rotated by 90 deg.), positional relation of the lead-out conductor 5a with respect to a board does not change. A magnetic flux does not penetrate the lead-out conductor 5a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open magnetic circuit type laminated inductor suitable for mounting on a high-frequency circuit board of a mobile communication device or the like.

[0002]

2. Description of the Related Art FIGS. 9A and 9B show an example of a conventional laminated inductor. FIG. 9A is a perspective view, FIG. 9B is a schematic view showing an example of a mounted state, and FIG. It is a schematic diagram which shows another example.

Conventionally, as this kind of laminated inductor, as shown in FIG. 9A, external electrodes 3 are attached to both ends of a rectangular parallelepiped electrical insulator 2 and a coil 5 is embedded in the electrical insulator 2. Then, there is a laminated inductor 1 in which both ends of the coil 5 are respectively connected to the external electrodes 3.

However, in the laminated inductor 1, since the axial direction of the coil 5 (directions of arrows A and B) is orthogonal to the direction of external electrodes (directions of arrows C and D), as shown in FIGS. 9 (b) and 9 (c). In addition, the position where the magnetic field is generated differs depending on the mounting state of the multilayer inductor 1 on the substrate 9, and the inductance of the coil 5 (hereinafter referred to as L value) changes depending on the environment of peripheral components and the like on the substrate 9.

In order to avoid such a problem, the structure of the coil is different from that described in Japanese Patent Laid-Open No. 9-129449.
As disclosed in Japanese Unexamined Patent Publication, the axial direction of the coil 5 is made to coincide with the direction of the external electrode, so that the multilayer inductor 1
A method is conceivable in which the generation position of the magnetic field is determined in one way irrespective of the mounting state of, and a change in the L value is suppressed.

[0006]

However, these also have the following disadvantages.

First, since the L value also changes depending on the positional relationship between the lead conductor of the coil 5 and the substrate 9, if this lead conductor is arranged on one side of the laminated inductor 1, the L value still remains. There is a risk that the L value may vary depending on the mounting state of the multilayer inductor 1.

Second, simply positioning the lead conductor at the center of the external electrode 3 with the aim of suppressing a change in the L value causes the conductor connecting the lead conductor and the coil 5 to penetrate the magnetic flux. The value drops.

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide a laminated inductor which can avoid the variation due to the setting of the L value and can suppress a decrease in the Q value.

[0010]

That is, according to the first aspect of the present invention, conductive patterns (34, 36, 38, 40, 42) are alternately laminated on an electric insulating layer using non-magnetic ceramics, By sequentially connecting the end portions of the conductor patterns, a coil (5) superimposed in the laminating direction is formed and is buried in an electric insulator (2) made of the electric insulating layer. An external electrode (3) is provided on the surface of the electrical insulator, the external electrode being connected to each of two lead conductors (5a) extracted from the coil, and the laminated direction of the coil is the external electrode direction. , The respective lead conductors are located substantially at the center in the cross section of the inductor viewed from the direction of the external electrode, and the coil is configured to orbit the position.
Since the coil orbits around the center of the cross section of the inductor having the lead conductor, there is no need for a conductor connecting the coil and the lead conductor. Therefore, there is no conductor crossing the magnetic flux generated in the coil, and the Q value of the coil does not decrease.

Here, the nonmagnetic ceramics include:
Dielectric ceramics added with glass and sintered at a low temperature can be used. In this case, a dielectric material in which borosilicate glass is mixed with alumina in a ratio of 70:30 by volume is used, and a mixture of ethyl cellulose, terpinel, a dispersant, and a plasticizer as a vehicle is mixed and mixed. Make a paste for printing. On the other hand, as the conductor pattern, a mixture of the above vehicle with a conductor paste such as silver or silver palladium can be used. The binder may be PVB, methylcellulose or acrylic resin other than ethylcellulose. In addition, it is necessary to consider the dispersant and the plasticizer in consideration of improvement in printability and handleability during production.

The present invention according to claim 2 is configured such that the position of each of the lead conductors (5a) is 0.05 mm or less in radius from the center of the cross section of the inductor viewed from the direction of the external electrodes. If it exceeds 0.05 mm, the L value greatly changes depending on the position where the multilayer inductor is placed.
If it is 0.05 mm or less, the change in the L value is 10% or less.

According to a third aspect of the present invention, in the coil (5), a winding start portion and a winding end portion are located at half positions on opposite sides from substantially the center of the cross section of the inductor, and the coil is wound around the winding. It is configured to be arranged so as to gradually move to the opposite side from the beginning to the winding end. By gradually changing the position of the coil, the position of each conductor is shifted, the stray capacitance generated between the coils is reduced, the resonance frequency is increased, and the high frequency characteristics are improved.

The present invention according to claim 4 is configured such that the coils (5) have the same shape in the stacking direction. Since all the coil patterns have the same shape that goes around the central part where the lead conductor is located, the number of screens used is reduced, and the cost is reduced.

According to a fifth aspect of the present invention, the coil (5) is gradually deformed from the winding start portion and the winding end portion toward the central portion in the laminating direction, so that the coil (5) has a central portion in the laminating direction. Is configured so as to effectively utilize the entire cross section. With this configuration, only the coil connected to the lead conductor goes around the center of the inductor cross section, and the coil shape goes around the outer periphery toward the center, so that there is no conductor crossing the magnetic flux,
A high L value can be obtained.

According to a sixth aspect of the present invention, a conductive pattern (1) is formed on an electric insulating layer using non-magnetic ceramics.
4, 16, 18, 20, 22) are alternately stacked, and the ends of the respective conductor patterns are sequentially connected to form a coil (5) that is superimposed in the stacking direction, and the electricity formed of the electric insulating layer is formed. External electrodes (3) which are buried in the insulator (2) and are respectively connected to two lead conductors (5a) drawn from the coil on the surface of the electric insulator; In the laminated inductor (1) in which the lamination direction of the coil is the external electrode direction, each of the lead conductors is extended from a corner of the coil,
The connection positions of the two lead conductors with respect to the coil are opposite to each other, and the L value is 5 nH or more. Thus, by connecting the lead conductor to each external electrode from the diagonal corner of the coil, the variation becomes 10% or less in the laminated inductor of 5 nH or more. If it is less than 5 nH, the variation in the lead conductor at this position exceeds 10% and becomes large.

According to a seventh aspect of the present invention, a conductor pattern is alternately laminated on an electric insulating layer using non-magnetic ceramics, and ends of the conductor patterns are sequentially connected to each other in the laminating direction. The two superimposed coils (5, 6) are formed parallel to each other and are buried in the electric insulator (2) made of the electric insulating layer, and the coils are placed on the surface of the electric insulator. An external electrode (3) connected to each of the two lead conductors (5a, 6a) drawn out of the coil is provided, and in the laminated inductor (1) in which the lamination direction of each coil is the direction of the external electrode, each of the lead conductors Are drawn from the corners of each of the coils,
The configuration is such that the L value is 20 nH or less. As described above, by forming two coils and extending the lead conductors from the diagonal positions of the coils, the variation in the L value depending on the position where the multilayer inductor is placed is reduced. However, the coils are connected in parallel in terms of an equivalent circuit.
Twice the number of turns is required compared to a single coil, and 20 nH
Since it is difficult to form a coil exceeding the limit, the value is set to less than this value.

Further, according to the present invention, the conductor patterns are alternately laminated on the electric insulating layer using the non-magnetic ceramic, and the ends of the conductor patterns are sequentially connected, so that the conductor patterns are arranged in the laminating direction. Four superimposed coils (5, 6,
7, 8) are formed in parallel with each other and are buried in the electric insulator (2) made of the electric insulating layer. An external electrode (3) connected to each of the lead conductors (5a, 6a, 7a, 8a) is provided, and in the multilayer inductor (1) in which the lamination direction of each coil is the external electrode direction, each of the lead conductors is Each coil is drawn out from the corner, and is configured such that the L value is 10 nH or less. Thus, by forming four coils inside and extending the lead conductors from diagonal corners of the coil, the lead conductors are extended from all four corners of the coil, and the variation in the L value is extremely reduced. However, since the coils are connected in parallel in terms of an equivalent circuit, the number of turns is required to be four times that of a single coil.
Since it is difficult to form a coil exceeding 10 nH, it was set to less than this.

It is to be noted that the numbers in parentheses and the like are for convenience showing the corresponding elements in the drawings, and therefore, the present invention is not limited to the description on the drawings. This is the same for the column of “Claims”.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the multilayer inductor according to the present invention.
It is a diagram showing an embodiment of the present invention, (a) is a left side view thereof,
FIG. 2B is a front view, FIG. 2 is a process diagram showing a method for manufacturing the multilayer inductor shown in FIG. 1, FIG. 3 is a diagram showing a second embodiment of the multilayer inductor according to the present invention, and FIG. FIG. 4B is a left side view, FIG. 4B is a front view, FIG. 4 is a view showing a third embodiment of the multilayer inductor according to the present invention, and FIG.
Is a left side view thereof, (b) is a front view thereof, and FIG. 5 is a view showing a fourth embodiment of the laminated inductor according to the present invention.
(A) is a perspective view thereof, (b) is a schematic view showing an example of the mounted state, (c) is a schematic view showing another example of the mounted state, and FIG. 6 is a method for manufacturing the laminated inductor shown in FIG. FIGS. 7A and 7B are views showing a fifth embodiment of the laminated inductor according to the present invention, wherein FIG. 7A is a perspective view thereof, FIG. 7B is a schematic view showing an example of a mounted state thereof, and FIG. 8) is a schematic diagram showing another example of the mounting state, FIG. 8 is a view showing a sixth embodiment of the multilayer inductor according to the present invention, (a) is a perspective view thereof, and (b) is its mounting state. Schematic diagram showing an example of
(C) is a schematic diagram showing another example of the mounting state.

As shown in FIG. 1, a laminated inductor 1 according to the present invention has a rectangular parallelepiped electric insulator 2, in which an electric insulating layer using a non-magnetic ceramic is used. A plurality of conductor patterns are alternately laminated, and the ends of each conductor pattern are sequentially connected to embed a coil 5 superimposed in the laminating direction. External electrodes 3 are respectively mounted on both end surfaces of the electric insulator 2, and each of the external electrodes 3 is connected to two lead conductors 5 a drawn from the coil 5 to conduct. Further, the axial direction of the coil 5 matches the external electrode direction.

By the way, each lead conductor 5a is shown in FIG.
As shown in (a), the inductor is located at substantially the center (with a radius of 0.05 mm or less from the center) in the cross section of the inductor viewed from the direction of the external electrode, and the coil 5 goes around that position. Here, as shown in FIG. 1B, the coil 5 has a winding start portion and a winding end portion located at half positions on the opposite sides from substantially the center of the inductor cross section, and from the winding start portion to the winding end portion. It is arranged to gradually move to the opposite side as it goes.

Since the laminated inductor 1 according to the present invention has the above-described configuration, the L value does not vary depending on the mounting state of the laminated inductor 1. That is,
Since the axial direction of the coil 5 matches the external electrode direction,
The magnetic field is generated on the substrate of the multilayer inductor 1 (not shown).
In addition to being determined irrespective of the mounting state of the multilayer inductor 1, since each lead conductor 5a is located substantially at the center of the cross section of the inductor, even if the mounting state of the laminated inductor 1 changes (even if it is rotated by 90 °). ), The positional relationship of the lead conductor 5a to the substrate does not change. As a result, there is no variation in the L value depending on the mounting state of the multilayer inductor 1. Here, the position of each lead conductor 5a is 0.05 mm or less in radius from the center of the cross section of the inductor.
035 nH, which is sufficiently small.

Further, since the coil 5 orbits the position of the extraction conductor 5a, there is no conductor for connecting the coil 5 and the extraction conductor 5a, and there is no conductor crossing the magnetic flux generated in the coil 5, and therefore, the Q value It does not cause a decline.

In addition, the coil 5 has a winding start portion and a winding end portion which are located at half positions on the opposite sides from substantially the center of the inductor cross section, and gradually moves to the opposite side from the winding start portion to the winding end portion. As a result, the overlapping of the coil conductors is reduced, the stray capacitance due to the coil 5 is reduced, and the resonance frequency is increased.

In order to manufacture the laminated inductor 1, a printing lamination method can be used. Hereinafter, the method will be described.

First, as shown in FIG. 2A, a dielectric pattern 31 is printed while leaving a round hole 32 for a lead conductor, and then the round hole 32 is filled as shown in FIG. 2B. The electrodes 33 are printed as described above. This is repeated as many times as necessary.

Next, as shown in FIG.
The conductor pattern 34 is printed so as to connect to FIG.
As shown in (d), the dielectric pattern 35 is printed so that a part of the conductor pattern 34 is hidden. Then, FIG.
As shown in FIG.
6 is connected to the conductor pattern 34 and printed, and as shown in FIG. 2F, the dielectric pattern 37 is printed so as to hide the conductor pattern 34. Then, as shown in FIG. 2 (g), a conductor pattern 38 is printed on the dielectric pattern 37 so as to be connected to the conductor pattern 36, and as shown in FIG. The pattern 39 is printed.
Next, as shown in FIG. 2 (i), a conductor pattern 40 is connected to the conductor pattern 38 and printed on the dielectric pattern 39, and as shown in FIG. The body pattern 41 is printed. Further, FIG.
As shown in (k), the conductor pattern 42 is printed on the dielectric pattern 41 while being connected to the conductor pattern 40. The coil is formed so that the coil is shifted from the right side to the left side of the multilayer inductor 1 in FIG.

Finally, as shown in FIG. 2 (l), after the dielectric pattern 43 is printed while leaving the round hole 44 for the lead conductor, as shown in FIG. The electrodes 45 are printed so as to be filled. This is repeated as many times as necessary.

Here, the manufacture of the laminated inductor 1 by the printing lamination method is completed. With this structure, the stray capacitance due to the coil 5 decreases, the resonance frequency increases, and good characteristics are obtained up to high frequencies.

In the above-described embodiment, the winding start portion and the winding end portion are located at half positions on the opposite sides from the approximate center of the cross section of the inductor, and gradually become opposite from the winding start portion to the winding end portion. Although the case where the coil 5 arranged so as to move to the side is employed has been described, various other arrangements can be adopted for the arrangement of the coil 5. For example, as shown in FIG. 3, a coil 5 having the same shape (a concave pentagon in FIG. 3) in the stacking direction may be used. In this case, by repeating the same conductor pattern, the process can be simplified, and the laminated inductor 1 having a large area surrounded by the coil and having a high L value can be obtained as shown in FIG.

Alternatively, as shown in FIG. 4, the shape gradually deforms from the winding start portion and the winding end portion toward the central portion in the laminating direction, and the entire cross section is effectively used at the central portion in the laminating direction. May be adopted. As a result, a structure having a large L value and no conductor crossing the magnetic flux can be obtained.

Further, in the above-described embodiment, the case where each lead conductor 5a is located substantially at the center of the inductor cross section has been described. However, the lead conductor 5a can be pulled out from the corner of the coil 5. Hereinafter, the multilayer inductor 1 in which the lead conductor 5a is drawn out from the corner of the coil 5
Will be described.

That is, the laminated inductor 1 is the same as that shown in FIG.
As shown in FIG. 1A, a rectangular parallelepiped electrical insulator 2 is provided. In the electrical insulator 2, a plurality of conductor patterns are alternately laminated on an electrical insulating layer using nonmagnetic ceramics. The coils 5 that are superimposed in the stacking direction are buried by sequentially connecting the ends of the conductor patterns. External electrodes 3 are respectively mounted on both end surfaces of the electric insulator 2, and each of the external electrodes 3 is connected to two lead conductors 5 a drawn from the coil 5 to conduct. Further, the axial direction of the coil 5 matches the external electrode direction.

Incidentally, each lead conductor 5a is a coil 5
, And the connection positions for the coil 5 are opposite to each other.

Therefore, since the axial direction of the coil 5 coincides with the direction of the external electrodes, the position where the magnetic field is generated is determined in one way regardless of the mounting state of the multilayer inductor 1 on the substrate 9. Since the connection position of each lead conductor 5a to the coil 5 is at an opposite corner, the coil 5
5 (b) and 5 (c), even if the mounting state of the multilayer inductor 1 changes (even if it is rotated by 90 °), one of the lead conductors 5a Since the positional relationship that the other lead conductor 5a is located slightly away from the substrate 9 in the immediate vicinity does not change,
The variation of the L value caused by the mounting state of the multilayer inductor 1 is small. In particular, since the variation in the L value comes from the position of the extraction electrode, the relative tolerance is smaller for a high L value of 5 nH or more than for a low L value. Of course, even if the L value is low, it can be used when no change is necessary.

In order to manufacture the laminated inductor 1, a printing lamination method can be used. Hereinafter, the method will be described.

First, as shown in FIG. 6A, the dielectric pattern 11 is printed while leaving the round hole 12 for the lead conductor, and then the round hole 12 is filled as shown in FIG. 6B. The electrodes 13 are printed as described above. This is repeated as many times as necessary.

Next, as shown in FIG.
The conductor pattern 14 is printed so as to connect to FIG.
As shown in (d), the dielectric pattern 15 is printed so that a part of the conductor pattern 14 is hidden. Then, FIG.
As shown in FIG.
6 is connected to the conductor pattern 14 and printed, and as shown in FIG. 6F, the dielectric pattern 17 is printed so as to hide the conductor pattern 14. Next, as shown in FIG. 6 (g), a conductor pattern 18 is connected to the conductor pattern 16 and printed on the dielectric pattern 17, and as shown in FIG. The pattern 19 is printed.
Next, as shown in FIG. 6 (i), a conductor pattern 20 is connected to the conductor pattern 18 and printed on the dielectric pattern 19, and as shown in FIG. The body pattern 21 is printed. Further, FIG.
As shown in (k), the conductor pattern 22 is printed on the dielectric pattern 21 while being connected to the conductor pattern 20.

Lastly, as shown in FIG. 6 (l), after printing the dielectric pattern 23 leaving the round hole 24 for the lead conductor, as shown in FIG. The electrodes 25 are printed so as to be filled. This is repeated as many times as necessary.

Here, the manufacture of the laminated inductor 1 by the printing lamination method is completed.

In the above-described embodiment, the multilayer inductor 1 having one coil 5 has been described.
In the present invention, the number of coils 5 is not limited to one. For example, as shown in FIG. 7A, two coils 5 and 6 can be embedded in the electrical insulator 2 in parallel with each other and connected in parallel. In this case, since the connection positions of the lead conductors 5a and 6a with respect to the coils 5 and 6 are at opposite angles, even if the mounting state of the multilayer inductor 1 changes as shown in FIGS. Since the positional relationship of the lead conductors 5a and 6a of the coils 5 and 6 with respect to the substrate 9 does not change, the variation of the L value caused by the mounting state of the multilayer inductor 1 is further reduced. Further, since there are two coils 5 and 6, it is particularly suitable when the L value is as low as 20 nH or less. Further, since the two coils 5 and 6 are parallel to each other, the Q value is also improved.

As shown in FIG. 8, it is also possible to embed the four coils 5, 6, 7, 8 in the electrical insulator 2 in parallel with each other and connect them in parallel. In this case, the coils 5, 6, 7, 8 of the lead conductors 5a, 6a, 7a, 8a
8 are opposite to each other,
As shown in (b) and (c), even if the mounting state of the multilayer inductor 1 changes, the positional relationship between the lead conductors 5a, 6a, 7a, and 8a of the coils 5, 6, 7, and 8 with respect to the substrate 9 changes. Therefore, there is no variation in the L value depending on the mounting state of the multilayer inductor 1. In addition, since the number of the coils 5, 6, 7, and 8 is four, the L value is particularly 10 nH.
This is suitable for the following cases. Further, since the four coils 5, 6, 7, 8 are parallel to each other, the Q value is also improved.

In the above-described embodiment, the case where the laminated inductor 1 is manufactured by using the printed lamination method has been described. However, other methods for manufacturing the laminated inductor 1 include:
For example, a sheet lamination method may be used.

[0046]

As described above, according to the first aspect of the present invention, the axial direction of the coil 5 coincides with the direction of the external electrode, and each of the lead conductors 5a is located substantially at the center of the cross section of the inductor. Therefore, even if the mounting state of the multilayer inductor 1 changes (even if it is rotated by 90 degrees), the positional relationship of the lead conductor 5a with respect to the substrate does not change. Can be avoided. In addition, since there is no conductor for connecting the coil 5 and the lead conductor 5a, and there is no conductor crossing the magnetic flux generated in the coil 5, it is possible to suppress a decrease in the Q value.

According to the second aspect of the present invention, the position of each lead conductor 5a is 0.05 mm or less in radius from the center of the inductor cross section. Is 0.035 nH, which is sufficiently small. Therefore, it is possible to avoid the variation due to the setting of the L value and suppress the decrease in the Q value while securing the practicality as the laminated inductor 1.

According to the third aspect of the present invention, the coil 5 has a winding start portion and a winding end portion located at half positions on opposite sides from substantially the center of the cross section of the inductor. Since it is arranged so as to gradually move to the opposite side toward the part, it is possible to use up to a high frequency, and at the same time, it is possible to avoid the variation due to the setting of the L value and suppress the decrease of the Q value. It becomes possible.

Further, according to the present invention, since the same conductor pattern is repeated, the process can be simplified, and at the same time, the variation due to the setting of the L value can be avoided, and the Q value can be reduced. It is possible to suppress the decrease.

According to the fifth aspect of the present invention, the coil 5 is gradually deformed from the winding start portion and the winding end portion toward the central portion in the laminating direction, and at the central portion in the laminating direction. Since it has a shape that makes effective use of the entire cross section, it can be used for a high L value, and at the same time, it is possible to avoid variations due to how the L value is set and to suppress a decrease in the Q value.

According to the sixth aspect of the present invention, the axial direction of the coil 5 coincides with the direction of the external electrode, and the respective lead conductors 5a are drawn from opposite corners of the coil 5. , Even if the mounting state of the multilayer inductor 1 changes (even if it rotates 90 °),
Since the positional relationship of a with respect to the substrate does not change, it is possible to avoid a situation where the L value varies depending on how the laminated inductor 1 is placed.

According to the seventh aspect of the present invention, 2
The axial directions of the coils 5 and 6 coincide with the directions of the external electrodes, and each of the lead conductors 5a and 6a is
Therefore, even if the mounting state of the multilayer inductor 1 changes (even if it is rotated by 90 °), the coil 5,
Since the positional relationship of the lead-out conductors 5a and 6a with respect to the substrate does not change, it is possible to avoid a situation where the L value varies depending on how the laminated inductor 1 is placed. In addition, since each coil 5, 6 is parallel to each other,
It is possible to obtain a high Q value.

Further, according to the present invention according to claim 8,
The axial directions of the four coils 5, 6, 7, 8 coincide with the directions of the external electrodes, and the respective lead conductors 5a, 6a, 7
a, 8a are drawn out from the corners of the coils 5, 6, 7, 8 so that even if the mounting state of the multilayer inductor 1 changes (even if it is rotated by 90 °), the coils 5, 6, 7, 8 are drawn out. Since the positional relationship of the conductors 5a, 6a, 7a, and 8a with respect to the substrate does not change, it is possible to avoid a situation where the L value varies depending on how the laminated inductor 1 is placed. In addition, since the coils 5, 6, 7, 8 are parallel to each other, a high Q value can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a laminated inductor according to the present invention, wherein (a) is a left side view and (b) is a front view.

FIG. 2 is a process chart showing a method for manufacturing the multilayer inductor shown in FIG.

FIGS. 3A and 3B are views showing a second embodiment of the multilayer inductor according to the present invention, wherein FIG. 3A is a left side view and FIG. 3B is a front view.

4A and 4B are diagrams showing a third embodiment of the multilayer inductor according to the present invention, wherein FIG. 4A is a left side view and FIG. 4B is a front view.

5A and 5B are diagrams showing a fourth embodiment of the multilayer inductor according to the present invention, wherein FIG. 5A is a perspective view, FIG. 5B is a schematic diagram showing an example of a mounted state, and FIG. It is a schematic diagram which shows another example of a state.

FIG. 6 is a process chart showing a method for manufacturing the multilayer inductor shown in FIG.

7A and 7B are diagrams showing a fifth embodiment of the multilayer inductor according to the present invention, wherein FIG. 7A is a perspective view, FIG. 7B is a schematic diagram showing an example of a mounted state, and FIG. It is a schematic diagram which shows another example of a state.

8A and 8B are diagrams showing a sixth embodiment of the multilayer inductor according to the present invention, wherein FIG. 8A is a perspective view, FIG. 8B is a schematic diagram showing an example of a mounted state, and FIG. It is a schematic diagram which shows another example of a state.

FIG. 9 is a diagram showing an example of a conventional laminated inductor.
(A) is a perspective view, (b) is a schematic diagram showing an example of the mounting state, and (c) is a schematic diagram showing another example of the mounting state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Laminated inductor 2 ... Electrical insulator 3 ... External electrode 5,6,7,8 ... Coils 5a, 6a, 7a, 8a ... Extraction conductors 14,16,18,20,22 ... Conductor pattern 34, 36, 38, 40, 42 ... conductor pattern

Continued on the front page (72) Inventor Yoshinari Noyoro 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. F-term (reference) 5E043 AA08 EB01 5E070 AA01 AB04 AB06 BA01 CB03 CB13

Claims (8)

[Claims] 1. Conductive patterns (34, 36, 38, 40, 42) are alternately laminated on an electrically insulating layer using non-magnetic ceramics, and the end portions of the respective conductor patterns are sequentially connected to be laminated. A coil (5) superimposed in the direction is formed and buried in an electric insulator (2) made of the electric insulating layer, and a coil (5) pulled out from the coil on the surface of the electric insulator.
An external electrode (3) connected to each of the two lead conductors (5a) is provided, and in the multilayer inductor (1) in which the coil is stacked in the external electrode direction, each of the lead conductors is an inductor viewed from the external electrode direction. A multilayer inductor, which is located substantially at the center in a cross section, and wherein the coil goes around the position. 2. The position of each lead conductor (5a) is set to a radius of 0.0 from the center of the inductor section viewed from the direction of the external electrode.
The multilayer inductor according to claim 1, wherein the thickness is 5 mm or less. 3. A winding start portion and a winding end portion of the coil (5) are located at half positions opposite to each other from substantially the center of the cross section of the inductor, and the coil gradually moves from the winding start portion to the winding end portion. The multilayer inductor according to claim 1, wherein the multilayer inductor is arranged to move to the opposite side. 4. The multilayer inductor according to claim 1, wherein the coils have the same shape in the stacking direction. 5. The coil (5) is gradually deformed from its winding start portion and winding end portion toward the central portion in the laminating direction, and has a shape in which the entire cross section is effectively used at the central portion in the laminating direction. 2. The method according to claim 1, wherein
3. The multilayer inductor according to item 1. 6. Conductive patterns (14, 16, 18, 20, 22) are alternately laminated on an electrically insulating layer using non-magnetic ceramics, and the end portions of each of the conductive patterns are sequentially connected to be laminated. A coil (5) superimposed in the direction is formed and buried in an electric insulator (2) made of the electric insulating layer, and a coil (5) pulled out from the coil on the surface of the electric insulator.
An external electrode (3) connected to each of the two lead conductors (5a) is provided, and in the laminated inductor (1) in which the coil is stacked in the external electrode direction, each of the lead conductors is drawn from a corner of the coil. Wherein the connection positions of the two lead conductors to the coil are at opposite angles, and the L value is 5 nH or more. 7. Two coils (5, 6) superimposed in the laminating direction by alternately laminating conductor patterns on an electric insulating layer using non-magnetic ceramics, and by sequentially connecting the ends of the conductor patterns. ) Are formed in parallel with each other and are buried in an electric insulator (2) made of the electric insulating layer, and two lead conductors ( An external electrode (3) connected to each of 5a and 6a) is provided, and in the multilayer inductor (1) in which the lamination direction of each coil is the external electrode direction, each of the lead conductors is pulled out from a corner of each coil. And a L value of 20 nH or less. 8. Four coils (5, 6) superimposed in the laminating direction by alternately laminating conductor patterns on an electrically insulating layer using non-magnetic ceramics, and by sequentially connecting ends of the conductor patterns. , 7, 8) are formed in parallel with each other and are buried in the electric insulator (2) made of the electric insulating layer, and 2 drawn out from each coil on the surface of the electric insulator. An external electrode (3) is provided to be connected to each of the two lead conductors (5a, 6a, 7a, 8a). In the multilayer inductor (1) in which the lamination direction of each coil is the external electrode direction, each of the lead conductors is A multilayer inductor, which is drawn from a corner of each of the coils and has an L value of 10 nH or less.