JP7126042B2 - common mode noise filter - Google Patents

Description

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

As shown in FIGS. 6 and 7, a conventional common mode noise filter of this kind comprises first to seventh insulator layers 1a to 1g and first to seventh insulator layers 1a to 1g. and has first to fourth coil conductors 2 to 5 which are formed in a spiral shape of one or more turns by connecting the long side and the short side.

Also, the four connecting portions 2a to 5a connecting the long sides and the short sides of the first to fourth coil conductors 2 to 5 are arcuate. The connecting portions 2a to 5a have the same radius, and are arranged so as to overlap at the same position in a plan view.

Here, FIG. 6 is a cross-sectional view of connection portions 2a to 5a of a conventional common mode noise filter, and FIG. 7 is a state in which the first coil conductor 2 and the second coil conductor 3 of the same common mode noise filter are superimposed from above. of the

For example, Patent Document 1 is known as prior art document information related to the invention of this application.

JP 2013-138146 A

In the above-described conventional common mode noise filter, the first to fourth coil conductors 2 to 5 and the first to seventh insulator layers 1a to 1g have different thermal contraction rates. A stress is applied to the -fourth coil conductors 2-5 in the stacking direction and the plane direction, which makes the shapes of the first-fourth coil conductors 2-5 easily distorted, and particularly the connection parts 2a-5a. Since stress is likely to concentrate in the coil conductors, an increase in the number of laminations causes stress in the lamination direction in the connection portions 2a to 5a, which may cause insulation deterioration between the first to fourth coil conductors 2 to 5. I had a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a common mode noise filter capable of preventing deterioration of insulation between coil conductors.

A common mode noise filter according to a first aspect is formed in a plurality of laminated insulator layers and the plurality of insulator layers, and is formed in a spiral shape with one or more turns by connecting long sides and short sides. and at least two coil conductors, wherein a connecting portion that connects the long side and the short side of the two coil conductors is arc-shaped, and the connecting portion on at least the innermost circumference of the two coil conductors adjacent in the stacking direction. exist at different positions in plan view.

In the common mode noise filter according to a second aspect, in the first aspect, a dummy pattern exists inside the innermost circumference of the connecting portion.

As described above, in the common mode noise filter of the present invention, the arc-shaped connecting portions of two coil conductors adjacent to each other in the stacking direction are present at different positions in plan view, so the distance between the coil conductors at the connecting portion is As a result, stress in the stacking direction generated between the coil conductors at the connecting portion during firing can be reduced, thereby exhibiting an excellent effect of preventing deterioration of the insulation between the coil conductor layers.

Sectional view of a common mode noise filter in one embodiment of the present invention Perspective view of the same common mode noise filter Top view of the main part of the same common mode noise filter Top view of the main part of the same common mode noise filter Top view of the main part of another example of the same common mode noise filter Cross-sectional view of a conventional common mode noise filter Top view of the main part of the same common mode noise filter

FIG. 1 is a cross-sectional view of a common mode noise filter according to an embodiment of the present invention, FIG. 2 is a perspective view of the same common mode noise filter, and FIG. is a top view of the main part showing a state of being arranged in the

As shown in FIGS. 1 and 2, the common mode noise filter according to one embodiment of the present invention includes stacked first to seventh insulator layers 11a to 11g and first to seventh insulator layers. It has first to fourth coil conductors 12 to 15 formed as 11a to 11g.

A laminated body 16 is composed of the first to seventh insulator layers 11a to 11g and the first to fourth coil conductors 12 to 15, and the first to fourth coil conductors 12 to 15 are formed on the laminated body 16. First to fourth external electrodes 17a to 17d connected to the electrodes 15 are formed.

Then, as shown in FIG. 3, the first to fourth coil conductors 12 to 15 are formed in a spiral shape of one or more turns by connecting the long side and the short side. The first to fourth connecting portions 12a to 15a are arc-shaped.

Furthermore, the first connection portion 12a of the first coil conductor 12 and the second connection portion 13a of the second coil conductor 13 adjacent in the stacking direction are formed at different positions in plan view, and the third coil conductor 14 and the fourth connection portion 15a of the fourth coil conductor 15 are formed at different positions in plan view.

In the above configuration, the first to seventh insulator layers 11a to 11g are laminated in order from the bottom, and the second to sixth insulator layers 11b to 11f are made of an insulating material that is not a ferromagnetic material, For example, it is made of a non-magnetic material such as Cu--Zn ferrite or glass ceramic in a sheet form. The first and seventh insulator layers 11a and 11g are sheet-shaped made of a magnetic material such as Cu--Ni--Zn ferrite.

The first to seventh insulator layers 11a to 11g may all be made of magnetic material or non-magnetic material, or combinations other than the combination of magnetic material and non-magnetic material described above may be used. Also, the number of the first to seventh insulator layers 11a to 11g is not limited to the number shown in FIG.

The first coil conductor 12 is formed by spirally plating or printing a conductive material such as silver on the upper surface of the fifth insulator layer 11e. The first coil conductor 12 is formed in a spiral shape with one or more turns by connecting the long side and the short side, and the first connecting portion 12a connecting the long side and the short side is arc-shaped.

The second coil conductor 13 is formed by spirally plating or printing a conductive material such as silver on the upper surface of the fourth insulator layer 11d. The second coil conductor 13 is similarly formed in a spiral shape with one or more turns by connecting the long side and the short side, and the second connecting portion 13a connecting the long side and the short side is arc-shaped. .

The third coil conductor 14 is formed by spirally plating or printing a conductive material such as silver on the upper surface of the third insulator layer 11c. The third coil conductor 14 is similarly formed in a spiral shape with one or more turns by connecting the long side and the short side, and the third connecting portion 14a connecting the long side and the short side is arc-shaped. .

The fourth coil conductor 15 is formed by spirally plating or printing a conductive material such as silver on the upper surface of the second insulator layer 11b. Similarly, the fourth coil conductor 15 is formed in a spiral shape with one or more turns by connecting the long side and the short side, and the fourth connecting portion 15a connecting the long side and the short side is arc-shaped. .

Also, the first coil conductor 12 and the third coil conductor 14 are connected to each other through via electrodes 18a to form one coil. The second coil conductor 13 and the fourth coil conductor 15 are connected to each other through via electrodes 18b to form the other coil.

Therefore, one coil composed of the first coil conductor 12 and the third coil conductor 14 and the other coil composed of the second coil conductor 13 and the fourth coil conductor 15 are alternately laminated. .

The second coil conductor 13 and the third coil conductor 14 may be sandwiched between the first coil conductor 12 and the fourth coil conductor 15 . Alternatively, two spiral coil conductors facing each other may be provided.

The via electrodes 18a and 18b are formed by drilling holes in predetermined locations of the third to fifth insulator layers 11c to 11e with a laser and filling the holes with silver.

Furthermore, in the first coil conductor 12 and the second coil conductor 13 adjacent in the stacking direction, the radii of the four (four corners) arc-shaped first connection portions 12a of the first coil conductor 12 The four arcuate second connection portions 13a of the coil conductors 13 of No. 2 have different radii. They exist and are arranged so that they do not overlap each other.

Similarly, in the third coil conductor 14 and the fourth coil conductor 15 adjacent in the stacking direction, the radii of the four arcuate third connection portions 14a of the third coil conductor 14 and the fourth coil conductor The four arc-shaped fourth connecting portions 15a of 15 have different radii, thereby making the third connecting portion 14a and the fourth connecting portion 15a exist at different positions in a plan view, and mutually They are arranged so that they do not overlap.

Here, in FIG. 3, the radius of the first connecting portion 12a of the first coil conductor 12 and the third connecting portion 14a of the third coil conductor 14 is set to the second connecting portion of the second coil conductor 13. 13a, and the radius of the fourth connection portion 15a of the fourth coil conductor 15 is made smaller than that of the fourth connection portion 15a. and the fourth connecting portion 15a are arranged so as not to overlap each other. The magnitude of this radius may be reversed.

FIG. 4 shows a state in which the first coil conductor 12 and the second coil conductor 13 are laid over each other from above. As shown in FIG. 4, the arc-shaped first connection portion 12a of the first coil conductor 12 and the arc-shaped second connection portion 13a of the second coil conductor 13 have different radii and overlap each other. It is arranged in such a way that it cannot be used.

At least two coil conductors adjacent to each other in the stacking direction may have different radii at their connecting portions, and may be located at different positions in plan view, and may be different from the above configuration.

That is, the radii of the first to fourth connection portions 12a to 15a are all different, the radii of the first and second connection portions 12a and 13a and the radii of the third and fourth connection portions 14a and 15a , and the radii of the first and fourth connecting portions 12a and 15a may be different from those of the second and third connecting portions 13a and 14a.

Furthermore, in the above description, in each of the first to fourth coil conductors 12 to 15, all the number of connection portions from the innermost circumference to the outermost circumference of the spiral are arranged at different positions in plan view. If, at least, the innermost peripheral connecting portions which are most affected by stress are arranged at different positions in plan view, it is not necessary to arrange all the connecting portions at different positions in plan view.

Further, as shown in FIG. 5, arc-shaped first to fourth connections are provided inside the innermost circumferences of the first to fourth connection portions 12a to 15a of the first to fourth coil conductors 12 to 15. Dummy patterns 12b to 15b may be arranged along the portions 12a to 15a. To suppress deformation of the shapes of the first to fourth coil conductors 12 to 15 due to stress due to shrinkage applied to the first to fourth coil conductors 12 to 15 during firing by using the dummy patterns 12b to 15b. can be done.

At this time, the dummy patterns 12b-15b are not connected to the first to fourth coil conductors 12-15. The outer shape of the dummy patterns 12b to 15b is the same shape as the first to fourth connection portions 12a to 15a. Further, in each of the first to fourth coil conductors 12 to 15, it is more preferable to form the dummy patterns 12b to 15b inside all the innermost circumferences of the four (four corners) connecting portions 12a to 15a.

Note that the first to fourth connection portions 12a to 15a may all have the same radius.

As described above, in the common mode noise filter according to the embodiment of the present invention, the arc-shaped first connection portion 12a and the second coil conductor 12a and the second coil conductor 13 of the first coil conductor 12 and the second coil conductor 13 adjacent to each other in the stacking direction. , and the arc-shaped third and fourth connection portions 14a and 15a of the third coil conductor 14 and the fourth coil conductor 15 adjacent in the stacking direction are present at different positions in plan view. Therefore, the distance between the coil conductors of the first connection portion 12a and the second connection portion 13a and the distance between the coil conductors of the third connection portion 14a and the fourth connection portion 15a are increased. As a result, the stress in the stacking direction generated between the coil conductors during firing can be reduced, so that it is possible to prevent insulation deterioration and short circuits between the coil conductor layers.

INDUSTRIAL APPLICABILITY The laminated coil component according to the present invention has the effect of preventing insulation deterioration between coil conductor layers, and is particularly useful for common mode noise filters and the like used in various electronic devices such as digital devices, AV devices, and information communication terminals. It is useful in

11a to 11g first to seventh insulator layers 12 first coil conductor 12a first connection portion 13 second coil conductor 13a second connection portion 14 third coil conductor 14a third connection portion 15 4 coil conductor 15a fourth connecting portion

Claims (1)

a plurality of stacked insulator layers; and at least two coil conductors formed on the plurality of insulator layers and formed in a spiral shape of one or more turns with continuous long sides and short sides, wherein the 2 A connection portion that connects the long side and the short side of the two coil conductors is formed in an arc shape, and the long side and the short side of the two coil conductors adjacent in the stacking direction are provided at a position where the long side and the short side substantially overlap in plan view, and at least the innermost A common mode noise filter in which connecting portions are provided at different positions in a plan view by making the radii of the circumferential connecting portions different from each other .

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