JPH0441620Y2 - - Google Patents

Description

[Detailed Description of the Device] Field of the Device This device has at least one inductance component and at least one capacitance component, such as a π-type filter, a T-type filter, an L-type filter, a distributed constant filter, etc. It relates to an LC filter element consisting of, in particular,
This invention relates to a laminated type integrated LC filter element.

Description of Prior Art For example, a π-type filter is composed of one inductance element 1 and two capacitance elements 2 and 3, as shown in FIG. When such a π-type filter is constructed from discrete components, it has drawbacks such as an increased occupied area and increased cost. In an attempt to improve this, it has been proposed to bond a chip-shaped inductance element and a capacitance element with glass or the like, but this method occupies a smaller area but complicates the manufacturing process and requires adhesive bonding. The disadvantage is that parts of the film may peel off due to thermal shock, etc.

As a technology that can overcome these drawbacks, there is a technique disclosed in Japanese Utility Model Application Publication No. 57-39124 "Laminated π-Type Filter". According to this prior art, an integrated chip-shaped π-type filter is obtained. However, this prior art also leaves problems to be solved.

For example, in this prior art, a conductive pattern that creates an inductance component and a capacitance component is formed using a screen printing method, but the printing pattern must be changed every time the specifications change, making it difficult to produce a wide variety of products in small quantities. This means that it is not suitable for Furthermore, since the part that produces the inductance component and the part that produces the capacitance component exist independently in one element, there is a limit to miniaturization. Furthermore, since the conductive pattern that creates the capacitance component is formed in a planar shape, the magnetic flux formed by the conductive pattern that creates the inductance component is blocked by the conductive pattern that creates the capacitance component, resulting in a decrease in Q and a decrease in the inductance value. Therefore, it is difficult to obtain an LC filter with excellent characteristics.

Another technique is disclosed in Japanese Patent Application Laid-open No. 117227/1983 entitled "Composite Parts." According to this prior art, an integrated chip-shaped T-shaped filter is obtained.

This prior art uses the conductive pattern that creates the inductance component not only to create the inductance component, but also as one of the conductive patterns that creates the capacitance component. This is different from the prior art disclosed in the official gazette. As a result, this prior art has the advantage of being more suitable for miniaturization than the prior art disclosed in Japanese Utility Model Application Publication No. 57-39124.

However, this prior art
Similar to the technology disclosed in Publication No. 39124, a conductive pattern that creates an inductance component and a capacitance component is formed using a screen printing method, and the printed pattern must be changed every time the specifications are changed. , it is unsuitable for high-mix, low-volume production. Furthermore, the fact that the conductive pattern that creates the capacitance component is formed in a planar manner is the same as the technology disclosed in Japanese Utility Model Application Publication No. 57-39124, and the magnetic flux formed by the conductive pattern that creates the inductance component becomes the capacitance component. This causes a decrease in Q and inductance value, making it difficult to obtain an LC filter with excellent characteristics.

Purpose of the invention The purpose of this invention is to solve the problems of the prior art described above. In other words, it is compact, resistant to thermal shock, and is suitable for high-mix, low-volume production.Moreover, the magnetic flux formed by the conductive pattern that creates the inductance component is transferred to the conductive pattern that creates the capacitance component. π-type filters and T-type filters with excellent characteristics, which are not blocked by windings and do not cause a decrease in Q or inductance value;
L-type filters, distributed constant filters, etc.
An object of the present invention is to provide an LC filter element that can be used as an arbitrary filter.

Summary of the invention This invention includes at least the following configurations:
It is an LC filter element. That is, a plurality of insulating sheets on which linear conductive patterns for inductors are formed are laminated, and the conductive patterns for inductors are sequentially electrically connected to form an inductance component. At least one insulating sheet on which a linear conductive pattern for a capacitor is formed is arranged adjacent to the laminate of insulating sheets on which a linear conductive pattern for an inductor is formed, or between the layers of the laminate. A capacitance component is formed between the linear conductive pattern for capacitor and the linear conductive pattern for inductor. Further, a predetermined insulating sheet is provided with a lead-out conductive portion for leading out the conductive pattern for the inductor or the conductive pattern for the capacitor to the outside.

The LC filter element of this invention is thus:
Since the conductive pattern for the inductor is used not only to create the inductance component, but also as one of the conductive patterns that creates the capacitance component, the number of laminated layers can be reduced accordingly, making it possible to downsize. ing. Moreover,
The conductive pattern for the capacitor is formed in a linear shape, and the magnetic flux formed by the conductive pattern for the inductor is not blocked by the conductive pattern for the capacitor, so there is no reduction in Q or inductance value. , it has excellent characteristics. Furthermore, if you prepare several types of insulating sheets in advance, such as insulating sheets with conductive patterns for inductors, insulating sheets with conductive patterns for capacitors, and insulating sheets without conductive patterns, you can Since LC filter elements can be assembled on a case-by-case basis according to the specifications requested, it can be said to be suitable for high-mix, low-volume production. Furthermore, the stacking mode can be changed in various ways, and depending on the stacking mode, any LC filter element such as a π-type filter, T-type filter, or distributed constant filter can be obtained. can. Needless to say, it is possible to obtain an integrated LC filter element that has these advantages, occupies a small area, and is resistant to thermal shock.

DESCRIPTION OF EMBODIMENTS First, a case will be described in which a π-type filter as shown in FIG. 1 is obtained.

Figures 2 to 8 are diagrams explaining one embodiment of this invention, Figures 2 to 7 are plan views of the insulating sheets to be laminated, and Figure 8 is a diagram illustrating an embodiment of the invention. FIG. 2 is a perspective view showing the appearance of an LC filter element.

The insulating sheets 4 to 9 shown in FIGS. 2 to 7, respectively, are stacked in such a way that an insulating sheet 5 is placed under the insulating sheet 4, an insulating sheet 6 is placed under that, and so on. Insulating sheets 4, 5, 6, . . . , 9 are laminated in order from the top.

The insulating sheet 4 in FIG. 2 is in a blank state and has no conductive pattern formed thereon.

On one side, that is, the top surface of the insulating sheet 5 in FIG.
0 is formed, and this inductor conductive pattern 1
An extraction electrode 11 is formed integrally extending from one end of the electrode 0 . The extraction electrode 11 is formed to extend, for example, to the lower side of the insulating sheet 5 as shown in the figure. A through hole 12 is formed at the other end of the conductive pattern 10 for an inductor, and is located in a region where the conductive pattern 10 for an inductor is formed.

A U-shaped linear capacitor conductive pattern 13 is formed on the insulating sheet 6 of FIG. 4, and an extraction electrode 14 is formed integrally extending from this capacitor conductive pattern 13. The extraction electrode 14 is
For example, it is formed extending to the right side of the insulating sheet 6 in the figure. In addition, the above-mentioned insulating sheet 5
A through hole 15 is provided corresponding to the position where the through hole 12 is provided. Note that the capacitor conductive pattern 13 does not extend to the location where the through hole 15 is provided. The left side portion of the capacitor conductive pattern 13 in the drawing has a shape that partially overlaps with the inductor conductive pattern 10 described above.

An inductor pattern 16 having an inverted C-shape is formed on the insulating sheet 7 shown in FIG. This conductive pattern 16 has a shape that partially overlaps with the capacitor conductive pattern 13 shown in FIG. A through hole 17 is formed at one end of the inductor conductive pattern 16 and is located within the region where the inductor conductive pattern 16 is formed. The other end of the inductor conductive pattern 16 extends to a position corresponding to the position where the above-described through holes 12 and 15 are provided, as indicated by the dotted line.

An inverted U-shaped linear capacitor conductive pattern 18 is formed on the insulating sheet 8 shown in FIG. An extraction electrode 19 is formed integrally extending from this capacitor conductive pattern 18, and this extraction electrode 1
9 is formed extending to the right side of the insulating sheet 8 in the figure. The right side portion of the capacitor conductive pattern 18 in the drawing is shaped to overlap with the inductor conductive pattern 16 shown in FIG. The insulating sheet 8 is provided with through holes 20 corresponding to the positions where the through holes 17 in FIG. 5 are provided.
The conductive pattern 18 does not extend to the location where the through hole 20 is provided.

A C-shaped linear conductive pattern 21 for an inductor is formed on the insulating sheet 9 shown in FIG. Extending integrally from one end of this inductor conductive pattern 21, a lead electrode 22 is formed. The extraction electrode 22 extends to the upper side of the insulating sheet 9 as shown in the figure. Conductive pattern 21 for inductor
has a shape that partially overlaps with the capacitor conductive pattern 18 of FIG. 6, and extends to the position where the aforementioned through holes 17 and 20 are provided at the other end, as shown by the dotted line.

The insulating sheets 4 to 9 described above are sequentially laminated and integrated. At this time, the inductor conductive pattern 10 and the inductor conductive pattern 16 are electrically connected via the through holes 12 and 15, and the inductor conductive pattern 16 and the inductor conductive pattern 21 are connected to the through hole 1.
They are electrically connected via 7 and 20. Therefore, these inductor conductive patterns 10, 1
6 and 21, the inductance element 1 of FIG. 1 is obtained. Further, the conductive pattern 13 for capacitor is the conductive pattern 10 and 1 for inductor.
6, insulating sheets 5 and 6, respectively.
The capacitance element 2 shown in FIG. 1 is formed here. Further, the capacitor conductive pattern 18 is in a state opposite to the inductor conductive patterns 16 and 21 via the insulating sheets 7 and 8, respectively. Here, the other capacitance element 3 of FIG. 1 is formed.

As shown in FIG. 8, when external electrodes 24 and 25 are formed on both end surfaces of the laminate 23, one of the external electrodes 24 is electrically connected to the extraction electrode 11, and the other external electrode 24 is electrically connected to the extraction electrode 11. 25 is electrically connected to the extraction electrode 22. Further, when the external electrode 26 is formed along the central portion of the laminate 23, it is electrically connected to the extraction electrodes 14 and 19. These three external electrodes 24, 25, and 26 constitute the three terminals shown in FIG. It was made into chips as shown in Figure 8.
The LC filter element can be electrically connected by face bonding on a suitable circuit board.

The insulating sheets 4 to 9 described above are preferably made of a magnetic material such as ferrite. However, such an insulating sheet 4
Since materials 9 to 9 also function as dielectrics, they are more preferably magnetic materials with high specific resistance. Magnetic materials with high resistivity include Ni-Zn ferrite, Ni-Cu-Zn ferrite, Mg-Zn ferrite, Cu-Zn ferrite, etc., and it is possible to obtain a resistivity of at least 1MΩ-cm or more from these. can. For example, after the insulating sheets 4 to 9 made of magnetic materials are laminated,
They are heat-pressed, fired, and integrated.

In addition to the above-mentioned magnetic materials, insulators such as alumina and dielectrics such as barium titanate can also be used as materials constituting the insulating sheets 4 to 9. That is, although the inductance may be small, it is still sufficiently practical depending on the application.

Further, as the material constituting the conductive pattern and the extraction electrode, a metal with a high melting point is preferably used, and silver-palladium, platinum, gold, etc. are used, and the material is formed by printing a paste of these metals. Note that it is not necessary to use a metal with a high melting point for the external electrode.

This invention can also be applied to an LC filter as shown in FIG. In the case of such an LC filter, there is only one capacitance element, so in the lamination of the insulating sheets described above,
This can be obtained by stacking only the insulating sheets 4 to 7. In this case, the last insulating sheet 7
Since a conductive part for drawing out is not formed in the conductive part, an insulating sheet 27 having a conductive part as shown in FIG. 10 may be used.

Referring to FIG. 10, the insulating sheet 27 includes:
An inductor conductive pattern 28 having an inverted J-shape is formed. A lead electrode 29 is formed integrally extending from one end of the inductor conductive pattern 28 . The extraction electrode 29 is made of an insulating sheet 2
It extends to the upper side according to figure 7. Note that since there is no insulating sheet following this insulating sheet 27, there is no need to form through holes.

Furthermore, the LC filter element of this invention can be constructed by further increasing the number of laminated insulating sheets. That is, the stacking of the insulating sheets 5 to 9 shown in FIGS. 3 to 7 described above is further repeated. In this case, the seventh
The extraction electrode 22 of the insulating sheet 9 shown in the figure is formed only on the insulating sheet 9 used at the end of such repetition. In this way, an LC filter element suitable as a distributed constant filter can be obtained.

Further, in the case of a filter as shown in FIG. 9, it can be obtained by sequentially laminating insulating sheets 4, 5, and 6 in the above-described lamination of insulating sheets. In this case, since the insulating sheet 5 has a conductive part for drawing out only at one end, an insulating sheet 30 having a conductive part as shown in FIG. 11 may be used.

Referring to FIG. 11, the insulating sheet 30 has C.
A linear conductive pattern 31 for an inductor is formed. A lead electrode 32 is formed integrally extending from one end of the inductor conductive pattern 31 . Further, from the other end of the inductor conductive pattern 31, an extraction electrode 33 is integrally extended.
is formed. Each of the extraction electrodes 32 and 33 extends to the lower and upper sides of the insulating sheet 30 as shown in the figure. Note that since the insulating sheet 30 does not have an insulating sheet formed with a conductive pattern that creates a subsequent inductance component, there is no need to form through holes.

FIGS. 12 to 16 are diagrams illustrating still other embodiments of this invention, and each is a plan view of an insulating sheet.

Since the embodiment shown in FIGS. 12 to 16 overlaps with the explanation regarding the embodiment shown in FIGS. 2 to 7, differences will be explained below.

The insulating sheet 34 in FIG. 12 is in a blank state and has no conductive pattern formed thereon.

A C-shaped linear conductive pattern 39 for an inductor is formed on one side, that is, the top surface of the insulating sheet 35 in FIG.
is formed. The extraction electrode 40 is formed to extend, for example, to the lower side of the insulating sheet 35 as shown in the figure. A through hole 41 is formed at the other end of the inductor conductive pattern 39 and is located within the region where the inductor conductive pattern 39 is formed.

An inductor conductive pattern 42 having an inverted C-shape is formed on the insulating sheet 36 shown in FIG. This inductor conductive pattern 42
It has a shape that partially overlaps with the conductive pattern 39 in FIG. Conductive pattern 42 for inductor
A conductive pattern 4 for this inductor is provided at one end of the inductor.
Through hole 4 located in the area where 2 is formed
3 is formed. Conductive pattern 42 for inductor
The other end extends to a position corresponding to the position where the above-described through hole 42 is provided, as indicated by the dotted line.

A C-shaped linear conductive pattern 44 for an inductor is formed on the insulating sheet 37 shown in FIG.
Extending integrally from one end of this inductor conductive pattern 44, a lead electrode 45 is formed. The extraction electrode 45 extends to the upper side of the insulating sheet 37 as shown in the figure. The conductive pattern 44 for an inductor is the conductive pattern 4 for an inductor shown in FIG.
2, and extends to the position where the above-mentioned through hole 43 is provided, as shown by the dotted line at the other end.

A U-shaped linear capacitor conductive pattern 46 is formed on the insulating sheet 38 in FIG. 16, and an extraction electrode 47 is formed integrally extending from this conductive pattern 46. The extraction electrode 47 is formed to extend, for example, to the right side of the insulating sheet 38 in the figure. The left side portion of the capacitor conductive pattern 46 in the drawing has a shape that partially overlaps with the inductor conductive pattern 44 described above.

The insulating sheets 34 to 38 described above are sequentially laminated and integrated. At this time, the inductor conductive pattern 39 and the inductor conductive pattern 42
are electrically connected via a through hole 41 , and the inductor conductive pattern 42 and the inductor conductive pattern 44 are electrically connected via a through hole 43 . Therefore, the inductance element shown in FIG. 9 is obtained by these inductor conductive patterns 39, 42, and 44.
Further, the capacitor conductive pattern 46 faces the inductor conductive patterns 42 and 44 via the insulating sheets 36 and 37, respectively, and the capacitance element shown in FIG. 9 is formed here.

In addition, in the description of the above embodiment, one insulating sheet is intended as a component for obtaining one LC filter element, and therefore the conductive pattern etc. It was designed with the intention of obtaining. However, on the premise that the sheet will be cut later, conductive patterns and the like for obtaining a large number of LC filter elements may be arranged and formed on one insulating sheet. In this way, a large number of LC filter elements can be obtained at the cutting stage.

In addition, in addition to the conductive pattern for obtaining this LC filter element, the insulating sheet constituting the LC filter element of this invention also has conductive parts for obtaining other LC filters or other circuit elements. may have been done.

Furthermore, in the above-described embodiment, the conductive pattern was formed on one side of the insulating sheet, but the conductive pattern may be formed on both sides of the insulating sheet on the premise of obtaining an LC filter element.

Further, a blank insulating sheet on which no conductive pattern is formed may be inserted between the insulating sheets on which the conductive pattern for an inductor or the conductive pattern for a capacitor is formed.

Effects of the invention As is clear from the above explanation, the effect of this invention is
LC filter elements use the conductive pattern for the inductor not only to create the inductance component, but also as one of the conductive patterns to create the capacitance component, which reduces the number of laminated layers and makes it more compact. It is becoming possible to

Moreover, since the conductive pattern for the capacitor is formed in a linear shape, the magnetic flux formed by the conductive pattern for the inductor is not blocked by the conductive pattern for the capacitor, resulting in a decrease in Q and a decrease in the inductance value. It has excellent characteristics.

Furthermore, if you prepare several types of insulating sheets in advance, such as insulating sheets with conductive patterns for inductors, insulating sheets with conductive patterns for capacitors, and insulating sheets without conductive patterns, you can With specifications according to requirements, π
Since type filters, T-type filters, L-type filters, and even distributed constant type filters can be assembled each time, it is suitable for high-mix, low-volume production.

Furthermore, since it is an integrally laminated type, it occupies a small area when mounted and is resistant to thermal shock.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a π-type filter. Figures 2 to 8 are diagrams for explaining one embodiment of this invention, in which Figures 2 to 7 are plan views of laminated insulating sheets, and Figure 8 is a diagram illustrating an embodiment of the invention.
FIG. 2 is a perspective view showing the appearance of an LC filter element. FIG. 9 is a circuit diagram of another LC filter. 10th
The figure is a plan view of an insulating sheet used in another embodiment of this invention. FIG. 11 is a plan view of an insulating sheet used in yet another embodiment of this invention. 12 to 16 are plan views of insulating sheets laminated in still another embodiment of this invention. 4, 5, 6, 7, 8, 9, 27, 30, 34,
35, 36, 37, 38...Insulating sheet, 1
0, 16, 21, 28, 31, 39, 42, 44
...Conductive pattern for inductor, 13, 18, 4
6... Conductive pattern for capacitor, 11, 14,
19, 22, 29, 32, 33, 40, 45, 4
7...Extraction electrode, 23...Laminated body, 24,2
5, 26...external electrode.

Claims (1)

[Claims for Utility Model Registration] (1) An LC filter element comprising at least one inductance component and at least one capacitance component, including a plurality of insulating sheets on which linear conductive patterns for inductors are formed. The inductor sheets are stacked, and the inductor conductive patterns are sequentially electrically connected to form an inductance component.
Alternatively, an insulating sheet on which a linear conductive pattern for a capacitor is formed is placed between the layers of a laminate of insulating sheets on which a linear conductive pattern for an inductor is formed, so as to overlap at least a part of the conductive pattern for an inductor. At least one or more conductive patterns are arranged, and a capacitance component is formed between the linear conductive pattern for capacitor and the linear conductive pattern for inductor, and further, the conductive pattern for inductor or the conductive pattern for capacitor is drawn out to the outside. An LC filter element characterized in that a lead-out conductive portion is formed on a predetermined insulating sheet. (2) The LC filter element according to claim 1, wherein the electrical connection between the conductive patterns for inductors is made through through holes.