JPH05283966A - Lc filter - Google Patents

Abstract

PURPOSE:To connect input/output terminals by only laminating them on dielectric films by positioning the input/output terminals of first and second conductors having notched parts at positions where the series connection of inductance is possible and laminating the input/output terminals on dielectric films having the notched parts. CONSTITUTION:An LC filter has conductor layers 5 connected each other on both surfaces with an interposed insulation layer 6 between them. A pair of conductors having notched parts to connect input/output terminals 21, 22, 23 of conductors 1a, 1b is formed as first and second conductors 1a, 1b and 2a, 2b. These first and second conductors have the location constitutions of terminals so that the series connection of inductance may be performed and have two kinds of constitutions, respectively. Dielectric films provided with the notched parts to connect the connection terminals of the first and second conductors are provided and a multilayered LC filter is prepared by laminating these. By only matching the notched parts of respective elements and laminating them, the input/output terminals are possible to be contacted and connected inside a periphery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LC filter which is a composite part combining a capacitor and a coil function.

[0002]

2. Description of the Related Art FIGS. 39, 40, 41, 42 and 4
3, FIG. 44, FIG. 45, and FIG.
It is a conventional LC filter shown in No. 4443. Figure 3
9 is a plan view of the conductive foil, FIG. 40 is a plan view of a single-layer LC filter composed of the conductive foil and a dielectric film, and FIG.
Is a front view of a single-layer LC filter, FIG. 42 is a plan view of a multi-layer LC filter, FIG. 43 is a front view of a multi-layer LC filter, FIG.
4 shows an equivalent circuit of the multilayer LC, FIG. 45 shows a front view of the multilayer LC filter having a ground layer, and FIG. 46 shows an equivalent circuit of the multilayer LC filter having a ground layer. Further, FIG. 47 is a development view showing an LC filter of another embodiment of the above conventional example, and FIG. 48 is an equivalent circuit thereof. 39, 40, 41,
42, 43, 44, 45, 46, 47, and 48, reference numerals 1, 2, and 3 denote first, second and third conductors, 4 denotes a dielectric film, and 7 and 8. Is an inductance, 9, 10 and 11 are capacitors, 12 is a ground inductance, 16 is an adhesive, 17 is a hole for inserting a magnetic material, 19 is a wound LC filter, 20, 21, 22, 23
Is an input / output terminal, and 24 is a ground terminal.

In FIG. 39, 1 is a ring-shaped conductor having a cut portion extending from the opening to the outer periphery, 20 is a terminal provided at one cut end of the conductor, and 21 is provided at the other cut end of the conductor. The formed terminal 17 is a hole for inserting a magnetic material. In FIG. 40 and FIG. 41, 2 is a conductor having a cut portion extending from the opening to the outer periphery, like 1 and has terminals 22 and 23 like the conductor 1. Reference numeral 4 is a ring-shaped dielectric film, which is inserted between the conductors 1 and 2 via an adhesive 16 to form a single-layer LC filter. At this time, the conductors 1 and 2 are overlapped with each other in the circumferential direction so that the terminals 20, 21 and 22 and 23 do not come into contact with each other. Next, n single-layer LC filters are laminated with the dielectric film 4 in between, and corresponding terminals are connected to form a multi-layer LC filter. Figure 4
2, FIG. 43, the terminal 21-1 of the conductor 1-1 and one terminal 20-2 of the conductor 1-2, the other terminal 21-2 of the conductor 1-2 and one of the conductor 1-3 Terminal 20-3,
Similarly, the terminals 21- (n-) of the conductor 1- (n-1) will be described below.
1) and one terminal 20-n of the conductor 1-n are respectively connected to form a multistage coiled first conductor. Similarly 2
-1, 2-2, ..., 2- (n-1), and 2-n conductors are connected to form a multistage coiled second conductor. By making the single-layer LC filter multi-layered as described above, the LC filter shown in the equivalent circuit of FIG. 44 is obtained. next,
A third conductor is inserted between the single-layer LC filters of the multilayer LC filter through a dielectric film, and the third conductors are connected to each other to form a multilayer LC filter including n layers. In FIG. 45, 3-1, 3-2, 3- (n-
1) is a ring-shaped third conductor, which is connected to each other at a terminal 24. This shields between the single-layer LC filters, so that the interlayer distributed capacitance is reduced and an LC filter having excellent high frequency characteristics can be formed. Furthermore, terminal 2
By using 4 as a ground terminal, a line-to-ground capacitor component is formed, and the LC filter shown in the equivalent circuit of FIG. 46 is obtained. Further, in FIG. 47, the coil 19 is formed as follows. A dielectric film 4 is superposed on a conductor sheet 3 having terminals 24, a conductor sheet 2 having terminals 22 and 23 thereon, and then a conductor having a dielectric film 4 and terminals 20 and 21. The sheet 1 and the dielectric film 4 are sequentially stacked,
These are wound to obtain the coil 19. Inductors 7 and 8 of FIG. 48 are respectively obtained from the conductor sheets 1 and 2 wound in this manner, and ground inductance 1 is obtained from the conductor sheet 3.
2 is formed, and an electrostatic capacitance 9 is formed from the conductor sheet 1, the dielectric film 4, and the conductor sheet 2. Further, a capacitance 10 is formed by the conductor sheets 1, 3 and the dielectric film 4 between them, and a capacitance 11 is formed by the conductor sheets 2, 3 and the dielectric film 4 therebetween.

[0004]

Since the conventional LC filter is constructed as described above, the manufacturing work is complicated due to the steps of stacking the terminals while appropriately shifting them and then connecting the terminals. Therefore, automation is difficult. When an LC filter having a line-to-ground capacitor is formed by adding a third conductor, the terminal connection of the third conductor is performed, and the terminal connection is more complicated and the workability is further hindered. In addition, the connection impedance between the third conductors, which is the ground layer, becomes high due to the inductance component, and the noise reduction effect is limited. Further, since the terminals are connected while being displaced in the circumferential direction, the shape is limited to a circle.

Further, since the conductor and the dielectric film are fixed with an adhesive, the capacitance of the capacitor becomes small due to the thickness of the adhesive, and it is difficult to set the constant and it is difficult to miniaturize the capacitor. Further, in the wound LC filter, there is a problem that the ground inductance 12 is formed by the third conductor sheet 3 and the noise removal effect by the line-to-ground capacitors 10 and 11 is reduced.

The present invention has been made to solve the above problems, and it is not necessary to stack the conductors while shifting them, and it is possible to connect the input / output terminals by simply stacking them. Also, the terminals of the ground layer can be connected at the same position. Alternatively, it is not necessary to take out the terminals, including the terminals of the ground layer, outside the circumference,
The terminals can be connected simply by stacking them, making them easy to manufacture and enabling automation. Further, it is possible to manufacture with a conductor shape other than a circular shape, and it is possible to obtain a filter shape according to the application. Also, the reliability of each terminal connection is improved. Another object of the present invention is to obtain an LC filter having a high noise removal effect in which the connection impedance of the ground layer is reduced.

Another object of the present invention is to fix a conductor and a dielectric film without using an adhesive to form a capacitor having a large capacitance and to obtain an LC filter whose constant can be easily set. Further, in the winding type LC filter using the first, second and third conductor seeds, the earth inductance is minimized to prevent the noise removal effect of the line-to-ground capacitor from being reduced. Further, by increasing the impedance of the ground line on the power supply side, the noise terminal voltage and the radiated electromagnetic noise are reduced.

[0008]

An LC filter according to the present invention is an LC filter composed of first and second conductors having an opening at the center and a dielectric film, and an input / output terminal on one surface of the LC filter. The conductor layer starting from is connected to the conductor layer on the other side across the insulating layer,
The other input / output terminal does not exceed the circumferential position of the first input / output terminal, and the other input / output terminal is the end point, and the cutout portion is provided at a position overlapping at least a part of the input / output terminal of the conductor element on the other side to be connected. The conductor element (a) and the conductor layer starting from the input / output terminal on one surface are connected to the conductor layer on the other surface with the insulating layer interposed therebetween, and the first input / output terminal in the circumferential direction. And a conductor element (b) having a notch portion at a position beyond the position of the other input / output terminal and overlapping with at least a part of the input / output terminal of the other conductor element to be connected. The dielectric film includes a dielectric film having a cutout portion at a position overlapping at least a part of the input / output terminal of the conductor element, and the first and second conductors formed by the conductor element are connected to the dielectric fill film. It is laminated by superimposing alternating through.

Further, each single layer LC of the above multi-layer LC filter
A third notch portion at a position overlapping at least a part of the input / output terminals of the first and second electric conductors made of the electric conductor element with the dielectric film interposed between the filters;
The conductor is inserted.

Also, a multi-layer L incorporating the above-mentioned third conductor
In the C filter, as a method of connecting each of the third conductors, the first and second conductors and the dielectric film have cutout portions at predetermined portions, and each of the third conductors is cut as described above. The connection is made by the notch portion, or each third conductor is provided with a protruding terminal, or the first and second terminals are provided.
The conductor and the dielectric film are provided with notches at predetermined portions, and the connecting conductor is provided for collectively connecting the terminals of the third conductor.

Further, a single layer LC filter composed of the first and second conductors or the first, second and third conductors and the dielectric film is superposed to form one block. It is configured by stacking blocks.

Further, in an LC filter composed of a conductor and a dielectric film, a conductive film is formed on the dielectric film as a conductor.

Also, the first, second and third conductor sheets and the first, second and third dielectric films are wound by alternately superposing the conductor sheets and the dielectric films, In an LC filter in which an input / output terminal is provided on each of the second conductor sheets, a ground terminal is provided in a predetermined area in the center of the third conductor sheet.

The first, second and third conductor sheets and the first, second and third dielectric films are wound by alternately laminating the conductor sheets and the dielectric films, In an LC filter in which an input / output terminal is provided on each of the second conductor sheets, two ground terminals are provided on the third conductor sheet, and one ground terminal is provided in a predetermined range in the central portion and the other ground terminal is provided. The terminals are arranged in a predetermined range on the ends.

[0015]

In the LC filter according to the present invention, the input and output terminals of the first and second conductors are arranged so that the inductances can be connected in series, and the notch portion for connecting these input and output terminals is provided. Have. Also, the first,
Since the second conductor is laminated with the dielectric film having the cutout portion for connecting the connection terminal of the second conductor, the conductor and the dielectric film can be laminated with the positional relationship fixed. , I / O terminals can be easily connected simply by stacking them.

A multilayer L having a line-to-ground capacitor
When the C filter is used, the first and second conductors are used as the third conductor.
In addition to the above-mentioned effect, since the notch portion for connecting the terminal of the conductor and the terminal for connecting the third conductor to each other are provided, the terminal of the third conductor is the same. Can be connected in position.

Further, the first and second conductors and the dielectric film are provided with notches for connecting the third conductors to each other, and the first and second conductors are used as the third conductor. Since the multi-layer LC filter is configured as a structure having a cutout portion for connecting the connection terminal of No. 1 and having no terminal for connecting the third conductors to each other outside the circumference, the terminal of the grant layer is also included. It is not necessary to connect the terminals after taking them out of the circumference, and the terminals can be connected simply by stacking them.

Further, in the above-mentioned LC filter, the third conductor is provided with a portion to which the connecting conductor piece is connected, and the third conductor is connected to each other by the conductor piece. An LC filter having a high removal effect can be obtained.

The first and second conductors, or the first and second conductors
By stacking the second and third conductors in a suitable number of layers to form one block, and stacking the blocks, it is possible to improve the workability of the multilayer LC filter, and at the same time, manufacture it at low cost. be able to. Also, because it is not necessary to shift each conductor, you can stack at the same position,
A shape of the LC filter other than a circular shape is possible, and the shape of the filter can be made to match the application.

Further, since the conductive layer is formed on the dielectric film by vapor deposition or electroless plating without using an adhesive, the dielectric layer can be kept thin and of a constant thickness. The size can be increased, the constant can be easily set, and the size can be reduced. In addition, by plating the conductive film formed on the dielectric film with a metal and increasing the thickness of the conductive film, it becomes possible to flow a large current.

Further, since the ground terminal is provided at the center of the third conductor used as the ground layer, the inductances formed by the third conductor cancel each other out, and the noise removal effect of the line-to-ground capacitor is reduced. Can be prevented.

Further, by providing a second ground terminal at one end of the third conductor and connecting it to the ground on the power supply side, the ground impedance on the power supply side is increased, noise flowing into the power supply side is suppressed, and noise is reduced. Electromagnetic noise radiated from the terminal voltage and the power supply line can be reduced.
By connecting the first ground terminal provided at the center to the ground terminal on the load side, noise can be returned to the load side without leaking outside.

[0023]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1, FIG. 2, FIG. 3, FIG. 4, FIG.
Is a plan view and a cross-sectional view showing a conductor of one embodiment, FIG. 7 is a plan view showing a dielectric film, FIG. 8 is a connection diagram showing only terminal connection of a first conductor, and FIG. 9 is a first conductor. 10 is a connection diagram showing the terminal connection between the body and the second conductor, FIG. 10 is a sectional connection diagram of the multilayer LC filter, FIG. 11 is an equivalent circuit, and FIG. 12 is an external view. 1 to 11 and 12, 1a, 1
b is a first conductor, 2a and 2b are second conductors, 4 is a dielectric film, 5 is a conductive layer of a conductor, 6 is an insulating layer of a conductor, 7 and 8 are inductances, 9 is A capacitor, 17 is a hole for inserting a magnetic material, 18 is a magnetic material, 19 is a laminated LC filter, 20, 21, 22 and 23 are input / output terminals, and 28 is for connecting conductive layers located on both sides of the conductive material. Shows through holes.

1, 2 and 3 show holes 17 for inserting a magnetic material.
2 shows the configuration of the conductors 1a, 2a with open terminals,
The conductor layer starting from 0 (22) is connected to the conductor layer on the other surface at the portion of the through hole 28 having the conductor layer on the inner surface with the insulating layer in between, and the position of the terminal 20 (22) is A conductor element having the terminal 21 (23) as an end point is formed without crossing over, and a notch portion is provided at a position where the input / output terminal of the other conductor element comes. 4, 5, and 6
Shows the configuration of the other conductor 1b, 2b, and the conductor layer starting from the terminal 20 (22) is the through hole 28.
Is connected to the conductor layer on the other surface at the portion of, and forms a conductor element that ends at the terminal 21 (23) beyond the position of the terminal 20 (22). Although FIG. 3 and FIG. 6 are sectional views, they are schematic diagrams for recognizing the positional relationship between the starting point and the ending point of the input / output terminals of each conductor. FIG. 7 shows a dielectric film 4 having notches at positions where the terminals of the conductors 1a, 1b, 2a, 2b come and having a hole 17 for inserting a magnetic body.

FIG. 8 illustrates that the terminals of the conductors 1a and 1b can be connected to form one inductance.
The above elements are stacked and the corresponding terminals are connected.
That is, the terminal 21a-1 of the conductor 1a-1 and the conductor 1b-
One terminal 20b-1 of the one, the other terminal 2 of the conductor 1b
1b-1 and one terminal 20a-2 of the conductor 1a-2, terminal 21a-2 of the conductor 1a-2 and one terminal 20b-2 of the conductor 1b-2, and so on. Terminal 2
1a-n and one terminal 20b-n of the conductor 1b-n,
Each is connected to form a multi-stage coiled first multilayer conductor.

In addition to the above-mentioned first conductor, as shown in FIG. 9, similarly for the second conductor, 2a-1, 2b-
, 2a-2, 2b-2, ..., 2a-n, 2b-n, the terminals of the conductors are connected, and at the same time, the first conductors and the second conductors are alternately stacked to form a multilayer LC filter. To form. As shown in FIG. 10, each conductor is alternately laminated with the dielectric sheet 4 so as to achieve the terminal connection as described above, whereby the LC filter shown in the equivalent circuit of FIG. 11 is obtained. At this time, the overlapping terminal portions are contact-connected inside the circumference only by stacking the cutout portions of the respective elements together. Therefore, it is possible to adopt a configuration that does not require terminals for connection outside the circumference and does not require connection work for these terminals. If necessary, a magnetic body 18 such as ferrite may be attached as shown in FIG.

Example 2. 13 is a sectional view showing another embodiment of the present invention, FIG. 14 is an equivalent circuit, and FIG. 15 is a plan view showing a third conductor. In FIGS. 13, 14, and 15, 1a (1b), 2a (2b), 3 are first, second, and third conductors, 4 is a dielectric film, 7 and 8 are inductances, and 9 and 10. , 11, are capacitors, 20, 2
Reference numerals 1, 22, and 23 denote input / output terminals, and 24 denotes a ground terminal.

The third conductor 3 is inserted between the single-layer LC filters of the multi-layer LC filter of Example 1 through the dielectric film 4, and the third conductor 3 is connected to each other to n.
Form a multilayer LC filter consisting of layers. FIG. 15 shows a third conductor 3 having notches at the positions of the conductors 1a, 1b, 2a, 2b, a connecting ground terminal 24, and a hole 17 for inserting a magnetic body. Is.

In FIG. 13, 3a-1, 3b-1, 3a
-N is a third conductor and is connected to each other at the terminal 24. This shields between the single-layer LC filters, so that the interlayer distributed capacitance is reduced and an LC filter having excellent high frequency characteristics can be formed. Furthermore, by using the terminal 24 as a ground terminal, a line-to-ground capacitor can be formed, and the LC filter shown in the equivalent circuit of FIG. 14 can be obtained.
As shown in FIG. 13, each conductor is alternately laminated with the dielectric sheet 4 so as to achieve the terminal connection as described above, whereby the LC filter shown in the equivalent circuit of FIG. 14 is obtained.
At this time, the input / output terminal portions where the first and second conductors are overlapped are contact-connected inside the circumference by simply stacking the cutout portions of the respective elements together and the terminals of the third conductor are the same. Can be connected to each other in position. Therefore, it is possible to adopt a configuration that does not require an input / output terminal for connection outside the circumference, and the connection work for these can be eliminated. Also, the ground terminals can be connected at the same position. If necessary, a magnetic body 18 such as ferrite may be attached as shown in FIG. Further, the ground terminal of each third conductor is not limited to one place.

Example 3. 16 is a plan view of a first or second conductor of an LC filter showing still another embodiment of the present invention, FIG. 17 is a plan view of a third conductor, and FIG. 18 is a plan view of a dielectric film. is there. In FIGS. 16, 17, and 18, 1a (1b, 2a, 2b) is a first or second conductor, 3 is a third conductor, 4 is a dielectric film, and 17 is a hole for inserting a magnetic body. Indicates.

A part of the conductors 1a, 1b, 2a, 2b and the dielectric film 4 of the multi-layer LC filter of the above-mentioned Example 2 is provided with a cutout portion for contacting and connecting the third conductors to each other at this portion. Provided to form a multi-layer LC filter composed of n layers. FIG. 16 shows the first or second conductor 1a (1b, 2a, 2b) of the second embodiment, which is provided with a notch portion at a position where the third conductor is connected.
Is a conductor. FIG. 17 shows conductors 1a, 1b, 2a,
2b is a third conductor 3 having a notch at a position where the terminal of 2b comes and having a hole 17 for inserting a magnetic body. FIG.
Is a dielectric film 4 having a cutout portion at a position where the third conductor is connected to a part of the dielectric film 4 of the multilayer LC filter of the second embodiment.

Similarly to the case shown in FIG. 13, the LC filter shown in the equivalent circuit of FIG. 14 is obtained by alternately laminating the respective conductors with the dielectric sheet 4. At this time, the overlapping input / output terminal portions of the first and second conductors are contact-connected inside the circumference by simply stacking the cutout portions of the respective elements together, while the third conductor is The terminals can be contacted and connected to each other at the same position inside the circumference, and a terminal for connection is not necessary outside the circumference. The terminal including the ground terminal connection work required in the second embodiment is included. It is possible to eliminate the connection work of. In addition, if necessary, FIG.
A magnetic material 18 such as ferrite may be attached as in 2. Further, the cutout portions of the first and second conductors and the dielectric film provided for connecting the third conductors to each other are not limited to one location for each element.

Example 4. FIG. 19 is a plan view showing a third conductor of an LC filter showing another embodiment of the present invention, and FIG.
Is an external view. In FIGS. 19 and 20, 3 is the third
, 17 is a hole for inserting a magnetic material, 18 is a magnetic material, 1
Reference numeral 9 indicates a laminated LC filter, 20, 21, 22, and 23 indicate input / output terminals, 26 indicates a ground conductor connection terminal, and 27 indicates a ground connection conductor.

FIG. 19 shows the third conductor of the third embodiment, in which the ground conductor connecting terminal 26 for connecting with the connecting conductor is provided at the place where the third conductors are connected to each other. It is a conductor. In the third embodiment, when the third conductor 3 of FIG. 19 is used and the ground conductor connecting terminal 26 is connected by the ground connecting conductor 27 of FIG. 20, the inductance component of the ground connecting conductor 27 is low. The connection impedance for connecting the conductors of No. 3 can be reduced, and an LC filter having a high noise reduction effect can be obtained. In addition, the conductor for ground connection is LC
You may attach in multiple places per filter. In addition,
Although not shown, the first and second conductors and the dielectric film have cutout portions at positions corresponding to the cutout portions for the ground terminal connection terminals of the third conductor.

Example 5. 21 is a plan view of the first or second conductor of the LC filter showing still another embodiment of the present invention, and FIG. 22 is a sectional view thereof. In FIGS. 21 and 22, 1a (1b, 2a, 2b) is a first or second conductor, 5 is a conductive layer of a conductor, 6 is an insulating layer of a conductor, 17 is a hole for inserting a magnetic body, Reference numerals 20, 21 and (22, 23) are input / output terminals, 28 is a through hole for connecting conductive layers located on both sides of the conductor, and 29 is a solder heap.

Solder deposits are provided on the terminals 20, 21 (22, 23) of the first and second conductors of the multi-layer LC filters of Examples 1, 2, and 4 to form a multi-layer LC filter consisting of n layers. .. In addition, soldering is performed on the portions of the multilayer LC filter of Example 3 where the terminals 20, 21 (22, 23) of the first and second conductors and the third conductor of the third conductor are in contact with each other. Are provided to form a multilayer LC filter including n layers. 21 and 22 show the terminals 20 of the conductors 1a (1b, 2a, 2b) of Examples 1 and 2.
21 (22, 23) with conductor 29 having solder heap 29
(1b, 2a, 2b). Examples 1, 2, 3 above
As in the case of 4, when the multilayer LC filter is configured, the contact by the solder deposit 29, or the solder deposit 29 being crushed by pressure and contacting, can further secure the connection at the connection point and improve the reliability. it can.

Example 6. Examples 1, 2, 3, 4, 5 above
Of the first and second conductors of the multilayer LC filter of
The parts other than 1 (22, 23) are subjected to insulation treatment such as resist or coating to form a multi-layer LC filter consisting of n layers. Thereby, the dielectric film 4 can be omitted,
Since the number of parts can be reduced, cost can be reduced and workability can be improved. In addition, Examples 1, 2,
In 3 and 4, the thickness of the insulating layer applied here can be made thinner than the thickness of the dielectric film 4, and the connectivity of each terminal can be improved.

Example 7. Examples 1, 2, 3, 4, 5 above
Of the first multi-layer LC filter, or the first, second, or third multi-layer conductors are layered in an appropriate number of layers to form one block, and the multi-layer LC filter includes n layers in total. To form. At this time, if there are terminals connected to each other in the same block, they are connected by through holes or the like. Further, the surface of one block may be insulated by applying a resist or the like except the terminal portion, and the dielectric film 4 between the blocks may be omitted. By the above method, the LC filter can be easily formed into multiple layers, the workability is improved, and the LC filter can be manufactured at low cost.

Example 8. 23 is a plan view of a first or second conductor of an LC filter showing still another embodiment of the present invention, FIG. 24 is a plan view of a third conductor, and FIG. 25 is a plan view of a dielectric film. is there. 23, 24, and 25, 1a (2a) is a first or second conductor, 3 is a third conductor, 4 is a dielectric film, 17 is a hole for inserting a magnetic body, and 24 is a ground. Indicates a terminal.

In the multi-layer LC filters of Examples 1, 2, 3, 4, 5, 6, and 7 described above, it is not necessary to shift the positions when the respective elements are stacked, so that, for example, FIGS.
4, as shown in FIG. 25, the first and second conductors 1a (1b, 2
The shapes of a, 2b), the third conductor 3, and the dielectric film 4 can be formed into shapes other than the ring shape according to the application.

Example 9. Examples 1, 2, 3, 4, above
5, 6, 7 and 8 1a and 2 of the first and second conductors
a, 1b and 2b have the same shape. For example, although the conductor of FIG. 1 is 1a or 2a and the conductor of FIG. 4 is 1b or 2b, the conductors of FIG.
b, the conductor of FIG. 2 may be 1a or 2a.

Example 10. FIG. 26 is a plan view of an element of an LC filter showing still another embodiment of the present invention, FIG.
7 is a front view of the element, FIG. 28 is a plan view of the multilayer LC filter, FIG. 29 is a connection diagram of the multilayer LC filter, FIG.
27, 28, and 29, 4 is a dielectric film, 30 and 31 are first and second conductive films, 17 is a hole for inserting a magnetic material, and 20, 21, 22, and 23 are input / output terminals. Indicates.

26 and 27, an element forming an LC filter by forming a conductive film with an input / output terminal on a dielectric film 4 having a hole 17 for inserting a magnetic material by vapor deposition or electroless plating. To create. A multilayer LC filter is formed by stacking n of the above elements and connecting the corresponding terminals. 28 and 29, the conductive film 30
-1 terminal 21-1 and one terminal 20 of the conductive film 30-2
-2, the other terminal 21-2 of the conductive film 30-2 and the conductive film 3
0-3 on one side of the terminal 20-3, and the conductive film 30-
The terminal 21- (n-1) of (n-1) and one terminal 20-n of the conductive film 30-n are connected to each other to form a multistage coil-shaped first conductor. Similarly, 31-1, 31-2,
, 31- (n-1), 31-n conductive films are connected,
A multi-stage coiled second conductor is formed. Since the LC filter formed as described above does not use an adhesive unlike conventional ones, the dielectric layer can be thinned, so that a capacitor having a large capacitance can be formed and the size can be reduced. Further, since the thickness of the dielectric layer is the thickness of the dielectric film only, it is easy to set the constant.

Example 11. FIG. 30 is a plan view of an element of an LC filter showing still another embodiment of the present invention, and FIG.
1 shows a front view. 30 and 31, 4 is a dielectric film, 30 is a conductive film, 17 is a hole for inserting a magnetic material,
20 and 21 are input / output terminals, and 35 is metal plating.

A thick conductive film as shown in FIGS. 30 and 31 can be formed by plating the conductive film of Example 10 with metal by electrolytic plating or the like. It is difficult to secure a sufficient film thickness by vapor deposition or electroless plating,
Therefore, the current that can be passed through the filter is limited. However, by applying the metal plating 35 as described above, an LC filter capable of passing a large current can be obtained.

Example 12 32 and 33 are developed views showing still another embodiment of the present invention, and FIG. 34 is an equivalent circuit. 32, 33, and 34, reference numerals 1, 2, and 3 are first, second, and third conductive sheets, 4 is a dielectric film, 7 and 8 are inductances, 9, 10 and 11 are capacitors, Reference numeral 17 is a hole for inserting a magnetic material, 19 is a wound LC filter, 20, 21, 22, and 23 are input / output terminals, and 25 is a ground terminal.

The wound LC filter 19 is constructed as follows. As shown in FIG. 32, a first conductive sheet 1 having input / output terminals 20 and 21 on a dielectric film 4, a dielectric film 4, a third conductive sheet having a ground terminal 25, a dielectric. A second conductor sheet having the film 4 and the input / output terminals 22 and 23 is sequentially stacked, and these are wound to form a sheet shown in FIG.
The wound LC filter 19 shown in FIG. The conductor sheets 1 and 2 thus wound form the inductances 7 and 8 of FIG. 34, respectively, and the conductor sheet 1, the dielectric film 4 and the conductor sheet 2 form a capacitor 9. Furthermore, the conductor sheet 1, the dielectric film 4, and the conductor sheet 3 form a capacitor 10, and similarly, the conductor sheet 2, the dielectric film 4, and the conductor sheet 3 form a capacitor 11. The equivalent circuit is shown in FIG.

In the thus-formed LC filter, since the ground terminal 25 is provided at the center of the third conductor sheet 3, the current flowing through the third conductor sheet 3 is on both sides of the ground terminal. It goes in the opposite direction. Therefore, the third
The ground inductance formed by the conductor sheet 3 is canceled out, and has a very small value compared to when the ground terminal is provided at one end of the conductor sheet. Therefore, without reducing the noise removal effect of the capacitors 10 and 11,
An LC filter having good high frequency characteristics can be obtained. Further, if necessary, a magnetic material such as ferrite may be inserted in the hole 17 for inserting the magnetic material. In the present embodiment, the third
Although the position of the ground terminal 25 provided on the conductor sheet 3 is at the center of the conductor sheet, the same effect as that of the present embodiment can be expected by providing the ground terminal in a predetermined range in the center.

Example 13. FIG. 35 is a development view showing still another embodiment of the present invention, FIG. 36 is an equivalent circuit, and FIG. 37 is a connection diagram. 35, 36, and 37, 1, 2,
3 is the first, second, and third conductive sheets, 4 is a dielectric film, 7 and 8 are inductances, 9 and 10 and 11 are capacitors, 12 is a ground inductance, 13 is a load, and 14a and 14b are loads. Power supply terminal, 15 is a load ground terminal, 20, 21, 22, and 23 are input / output terminals, 2
4, 25 are ground terminals, 32 is a power line, 33a, 33
Reference numeral b denotes an outlet terminal, and 34 denotes a ground terminal of the outlet.

A second ground terminal 24 as shown in FIG. 35 is provided at one end of the third conductor sheet 3 of the twelfth embodiment. An equivalent circuit of a coil formed by winding a conductor sheet and a dielectric film as in Example 12 is as shown in FIG. 36, and the ground conductor 12 is formed by the third conductor sheet 3. As shown in FIG. 37, the ground terminal 24 is connected to the ground wire of the power supply line 32 and the ground terminal 25.
Is connected to the ground terminal 15 of the load 13. The LC filter formed as described above can increase the ground impedance on the power supply side by the ground inductance 12, suppress the noise flowing into the power supply side, and reduce the noise terminal voltage and the electromagnetic noise radiated from the power supply line. .. Further, by connecting the ground terminal 25 provided in the center to the ground terminal 15 on the load side, noise can be returned to the load side without leaking outside.

Example 14 FIG. 38 is a connection diagram showing still another embodiment of the present invention. In FIG. 38, 13 is a load, 14a and 14b are power terminals of the load, 15 is a ground terminal of the load, 20, 21, 22, and 23 are input / output terminals, 2
4, 25 are ground terminals, 32 is a power line, 33a, 33
Reference numeral b denotes an outlet terminal, and 34 denotes a ground terminal of the outlet.

In the thirteenth embodiment, as shown in FIG. 38, the ground terminal 24 having a ground inductance may be connected to the ground terminal 15 of the load, and the ground terminal 25 having no ground inductance may be connected to the ground terminal 34 of the outlet.

[0053]

The LC filter according to the present invention has the first,
In the second conductor, the input / output terminals are positioned so that the inductances can be connected in series, and have cutout portions for connecting these input / output terminals. Also,
Since it is formed by laminating it with the dielectric film having the cutout portion for connecting the connection terminals of the first and second conductors, the positional relationship of each element can be fixed and laminated. I / O terminals can be connected with just this.

In the case of a multi-layer LC filter having a line-to-ground capacitor component, the first and third conductors are
In addition to the above, since the notch portion for connecting the terminal of the second conductor and the terminal for connecting the third conductor to each other are provided, the terminal of the third conductor is the same. Can be connected in position.

Further, the first and second conductors and the dielectric film are provided with notches for connecting the third conductors to each other, and the first and second conductors are used as the third conductor. Has a notch for connecting the connection terminal of
Since the multilayer LC filter is configured as a structure having no terminals for connecting the conductors of each other to the outside of the circumference,
It is not necessary to take out the terminals, including the terminals of the ground layer, to the outside of the circumference, and to connect the terminals simply by stacking them.

Further, in the above-mentioned LC filter, the third conductor is provided with a portion to which the conductor piece is connected, and the third conductors are connected to each other by the conductor piece. Therefore, noise removal with reduced connection impedance of the ground layer is performed. It is possible to obtain a highly effective LC filter.

The first and second conductors or the first and second conductors
Since the second and third conductors are multilayered in an appropriate number of layers to form one block and the blocks are stacked to form a multilayer LC filter, the manufacturing is easy and the workability is improved, so that the cost is low. Can be manufactured. Further, since it is not necessary to shift each element and they can be stacked at the same position, an element shape other than a circular shape is possible and a filter shape suitable for the application can be obtained.

By forming a conductive film on the dielectric film by vapor deposition or electroless plating without using an adhesive, the dielectric layer can be kept thin and constant, so that the capacitance of the capacitor is reduced. The size can be increased, the constant can be easily set, and the size can be reduced. In addition, by plating the conductive film formed on the dielectric film with a metal and increasing the thickness of the conductive film, it becomes possible to flow a large current.

Further, since the ground terminal is provided in the center of the third conductor used as the ground layer, the inductances formed by the third conductor cancel each other out, and the noise removing effect of the line-to-ground capacitor is secured. can do. Further, by providing a second ground terminal at one end of the third conductor and connecting it to the ground on the power supply side, the ground impedance on the power supply side is increased, noise flowing into the power supply side is suppressed, and noise terminal voltage and Electromagnetic noise radiated from the power supply line can be reduced.
By connecting the first ground terminal provided at the center to the ground terminal on the load side, noise can be returned to the load side without leaking outside.

[Brief description of drawings]

FIG. 1 is a plan view of one surface of a first conductor or a second conductor according to a first exemplary embodiment of the present invention.

FIG. 2 is a plan view of the other surface of the first conductor or the second conductor according to the first exemplary embodiment of the present invention.

FIG. 3 is a cross-sectional view of the first conductor or the second conductor according to the first exemplary embodiment of the present invention.

FIG. 4 is a plan view of one surface of the first conductor or the second conductor according to the first exemplary embodiment of the present invention.

FIG. 5 is a plan view of the other surface of the first conductor or the second conductor according to the first exemplary embodiment of the present invention.

FIG. 6 is a sectional view of the first conductor or the second conductor according to the first exemplary embodiment of the present invention.

FIG. 7 is a plan view of the dielectric film of Example 1 of the present invention.

FIG. 8 is a connection diagram of the first conductor of the multilayer LC filter according to the first embodiment of the present invention.

FIG. 9 is a connection diagram of the multilayer LC filter according to the first embodiment of the present invention.

FIG. 10 is a cross-sectional connection diagram of the multilayer LC filter according to the first embodiment of the present invention.

FIG. 11 is an equivalent circuit of the multilayer LC filter according to the first embodiment of the present invention.

FIG. 12 is an external view of Example 1 of the present invention.

FIG. 13 is a cross-sectional connection diagram of the multilayer LC filter according to the second embodiment of the present invention.

FIG. 14 is an equivalent circuit of the multilayer LC filter according to the second embodiment of the present invention.

FIG. 15 is a plan view of a third conductor according to the second exemplary embodiment of the present invention.

FIG. 16 is a plan view of the first or second conductor according to the third exemplary embodiment of the present invention.

FIG. 17 is a plan view of a third conductor according to the third exemplary embodiment of the present invention.

FIG. 18 is a plan view of a dielectric film of Example 3 of the present invention.

FIG. 19 is a plan view of a third conductor according to the fourth exemplary embodiment of the present invention.

FIG. 20 is an external view of Example 4 of the present invention.

FIG. 21 is a plan view of the first or second electric conductor according to the fifth embodiment of the present invention.

FIG. 22 is a sectional view of a first or second conductor according to a fifth exemplary embodiment of the present invention.

FIG. 23 is a plan view of the first or second conductor according to the eighth exemplary embodiment of the present invention.

FIG. 24 is a plan view of a third conductor according to the eighth embodiment of the present invention.

FIG. 25 is a plan view of a dielectric film of Example 8 of the present invention.

FIG. 26 is a plan view of an element according to Example 10 of the present invention.

FIG. 27 is a front view of the element according to the tenth embodiment of the present invention.

FIG. 28 is a plan view of a multilayer LC filter according to Example 10 of the present invention.

FIG. 29 is a front view of the multilayer LC filter according to Example 10 of the present invention.

FIG. 30 is a plan view of an element according to Example 11 of the present invention.

FIG. 31 is a front view of the element according to the eleventh embodiment of the present invention.

FIG. 32 is a development view of an LC filter according to Example 12 of the present invention.

FIG. 33 is a development view of an LC filter according to Example 12 of the present invention.

FIG. 34 is an equivalent circuit of Example 12 of the present invention.

FIG. 35 is a development view of an LC filter according to Example 13 of the present invention.

FIG. 36 is an equivalent circuit of Example 13 of the present invention.

FIG. 37 is a connection diagram of the thirteenth embodiment of the present invention.

FIG. 38 is a connection diagram of the fourteenth embodiment of the present invention.

FIG. 39 is a plan view of a conductor showing a conventional LC filter.

FIG. 40 is a plan view of a conventional single layer LC filter.

FIG. 41 is a front view of a conventional single-layer LC filter.

FIG. 42 is a plan view of a conventional multilayer LC filter.

FIG. 43 is a front view of a conventional multilayer LC filter.

FIG. 44 is an equivalent circuit of a conventional multilayer LC filter.

FIG. 45 is a front view of another conventional multilayer LC filter.

FIG. 46 is an equivalent circuit of another conventional multilayer LC filter.

FIG. 47 is a development view of still another conventional LC filter.

FIG. 48 is an equivalent circuit of still another conventional LC filter.

[Explanation of symbols]

 1, 1a, 1b 1st conductor (1st conductor sheet) 2, 2a, 2b 2nd conductor (2nd conductor sheet) 3 3rd conductor (3rd conductor sheet) 4 Dielectric Film 5 Conductor Layer 6 Insulating Layer 21, 22, 23 Input / Output Terminals 24, 25 Ground Terminal 27 Ground Connection Conductor 30, 31 Conductive Film

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hironobu Tsutsumi 1-57 Miyashita 1-57, Sagamihara-shi, Sagami Manufacturing Co., Ltd. (72) Yoshio Igawa 1-57 Miyashita, Sagamihara Mitsubishi Electric Corporation Inside the Sagami Factory

Claims (7)

[Claims] 1. An LC filter comprising first and second conductors having an opening at the center and a dielectric film, wherein conductor layers starting from an input / output terminal on one surface sandwich an insulating layer. Is connected to the conductor layer on the other side, and the other input / output terminal is set as the end point without exceeding the position of the first input / output terminal in the circumferential direction, and the conductor element on the other side to be connected is inserted. A conductor element (a) having a cutout portion at a position overlapping at least a part of the output terminal;
The conductor layer starting from the input / output terminals on one side is connected to the conductor layer on the other side with the insulating layer sandwiched between them, and the conductor layer on the other side is crossed beyond the circumferential position of the first input / output terminal. A conductor element (b) having an input / output terminal as an end point and having a notch at a position overlapping with at least a part of the input / output terminal of the other conductor element to be connected, and the input / output terminal of the conductor element. The first and second conductors are formed of a dielectric film having a cutout portion at a position overlapping at least a part thereof, and the first and second conductors formed of the conductor element are alternately superposed and laminated through the dielectric film. Characteristic LC filter. 2. A position which overlaps at least a part of the input / output terminals of the first and second conductors made of the conductor element with a dielectric film interposed between the single-layer LC filters of the multilayer LC filter. An LC filter comprising a third conductor having a cutout portion inserted therein. 3. A method of connecting each third conductor,
The first and second conductors and the dielectric film have a notch portion at a predetermined portion, and each third conductor is connected by the notch portion, or to each third conductor. Providing a projecting terminal or a notch at a predetermined portion of the first and second conductors and the dielectric film, and a connecting conductor for collectively connecting the terminals of the third conductor. The LC filter according to claim 2, characterized in that 4. A single-layer LC filter composed of first and second conductors, or first, second and third conductors and a dielectric film is stacked to form one block, The LC filter according to any one of claims 1 to 3, wherein the LC filter is configured by forming a plurality of blocks. 5. An LC filter comprising a conductor and a dielectric film, wherein a conductive film is formed on the dielectric film as the conductor. 6. The first, second and third conductor sheets and the first, second and third dielectric films are wound by alternately superposing the conductor sheets and the dielectric films, and winding the first and second conductor films. L having input / output terminals provided on the second conductor sheet
In the C filter, a ground terminal is provided in a predetermined range in the central portion of the third conductor sheet, which is an LC.
filter. 7. The first, second and third conductor sheets and the first, second and third dielectric films are wound by alternately superposing the conductor sheets and the dielectric films, and winding the first and second conductor films. L having input / output terminals provided on the second conductor sheet
In the C filter, two ground terminals are provided on the third conductor sheet, one ground terminal is arranged in a predetermined range in the central portion, and the other ground terminal is arranged in a predetermined range in the end portion. Characteristic LC filter.