KR20150060522A - Common mode filter and electronic device including common mode filter - Google Patents

Abstract

The present invention relates to a common mode filter. All outer electrodes and ground electrodes have one surface exposed on a first surface of the common mode filter. Two of the outer electrodes and one of the ground electrodes have one side in contact with a first side of the common mode filter. The outer electrodes and the ground electrodes, which have no side in contact with the first side, have one side in contact with a second side of the common mode filter. Therefore, fixation strength of the common mode filter may be improved, and the generation rate of a short phenomenon may be reduced. According to the present invention, the common mode filter is strongly fixed, and signal transmission efficiency is improved. Also, overvoltage may be effectively removed, and the likelihood of a short phenomenon may be reduced when static electricity occurs.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electronic device having a common mode filter and a common mode filter,

The present invention relates to an electronic device comprising a common mode filter and a common mode filter.

The common mode filter is an electronic component widely used for eliminating common mode noise in various electronic apparatuses.

In recent years, as a result of miniaturization, slimming, and high performance of electronic products, research on a common mode filter capable of reducing the size and reducing the thickness of the noise while improving the noise removal performance has been continued.

On the other hand, in a high-speed digital interface, data is transmitted using a high-rate signal. Integrated circuits handling such signals are very sensitive to static electricity. Accordingly, there must be a means for quickly removing static electricity around such electrostatic sensitive integrated circuits. That is, there is a need for a component that quickly induces the overvoltage applied to the signal path to the ground terminal, which is sometimes referred to as an ESD protection component.

Patent Document 1 discloses a common mode filter including a static eliminating means.

Japanese Patent Laid-Open Publication No. 2012-033976

It is an object of the present invention to provide a common mode filter capable of sufficiently securing the bonding strength with an object to be mounted and improving the signal transmission efficiency while reducing the short-circuit phenomenon.

It is another object of the present invention to provide an electronic device provided with a common mode filter that can firmly fix a common mode filter, improve signal transmission efficiency, effectively eliminate overvoltage when static electricity is generated, .

According to an aspect of the present invention, there is provided a common mode filter including a discharge portion discharging an overvoltage applied between a discharge pattern and a ground pattern, and a coil including a coil formed by spirally arranging conductive patterns. And at least four external electrodes electrically connected to the coil and the discharge pattern, and at least two ground electrodes connected to the ground pattern, the common mode filter being provided between a pair of the magnetic bodies, Wherein at least one surface of each of the external electrodes and the ground electrodes is exposed to a first surface that is at least one of six surfaces of the common mode filter, One side of each of the ground electrodes of one of the ground electrodes may be all tangent to the first side of the first side.

At this time, among the external electrodes and the ground electrodes, the external electrodes and the ground electrodes, which do not contact one side of the first side, may all be in contact with the second side opposite to the first side.

In addition, the first surface may include a third side and a fourth side that are shorter than the first side.

The side of each of the external electrodes which is in contact with the first side or the second side is longer than the sides of the sides of the external electrodes that are not in contact with the first side or the second side, .

At least one side of each of the external electrodes may contact at least one side of the sides of the first surface except for the first side or the second side.

In addition, at least one side of each of the sides of the external electrodes may be in contact with the third side or the fourth side.

In addition, at least one external electrode of the external electrodes may include a surface exposed to a third surface sharing the first side with the first surface.

Here, at least one external electrode of the external electrodes may be exposed to at least one of a fifth surface sharing the third side with the first surface and a sixth surface sharing the fourth side with the first surface And a surface exposed to a third surface sharing the first side with the first surface.

The ratio of the lateral width to the longitudinal width of the external electrode may be 0.9 to 1.1 times the ratio of the lateral width to the longitudinal width of the first surface.

In this case, the width of the external electrode in the direction parallel to the first side is preferably 0.15 to 0.4 times the length of the first surface.

It is preferable that the minimum value of the length of one side of the ground electrode is 0.15 times or more of the length of the shortest side of the sides of the first side.

The discharge unit may include: a dummy external terminal electrically connected to the discharge pattern; A ground terminal contacting the ground electrode; And a connection pattern electrically connecting the ground terminal and the ground pattern. The connection pattern, the discharge pattern, and the ground pattern may be provided outside the vertical projection area of the area where the coil is formed in the coil part have.

A common mode filter according to an embodiment of the present invention is a common mode filter including four external electrodes and two ground electrodes, wherein the first surface of the common mode filter has a first side, a first side, And a fourth side opposed to the second side, the third side and the third side facing each other, wherein one surface of both the external electrodes and the ground electrodes is exposed on the first surface, and two of the external electrodes And one side of each of one of the ground electrodes is in contact with the first side, and one side of each of the external electrodes and one of the ground electrodes, which is not in contact with the first side, It may be tangent to two sides.

At this time, at least one side selected from the sides of each of the external electrodes that is not in contact with the first side or the second side may be in contact with the third side or the fourth side.

In addition, the first side and the second side may be longer than the third side and the fourth side.

Each of the sides of each of the external electrodes that is in contact with the first side or the second side is longer than the sides of the sides of the external electrodes that are in contact with the third side or the fourth side, have.

A common mode filter according to an embodiment of the present invention is a common mode filter having a hexahedron shape having a first side larger than a longitudinal side in a transverse direction and including four external electrodes and two ground electrodes, Each of the four external electrodes being located at four corners of the first surface and sharing respective two sides with the first surface and the two ground electrodes sharing a lateral side of the first surface, And may be spaced apart from the external electrodes between the electrodes.

According to an aspect of the present invention, there is provided a common mode filter comprising: a substrate made of a magnetic material; A coil portion provided on the base portion and including a coil having a conductive pattern arranged in a spiral shape and an external terminal connected to an end portion of the coil; A dummy external terminal which is provided on the coil part and is in contact with the external terminal, a discharge pattern electrically connected to the dummy external terminal, a ground pattern spaced apart from the discharge pattern by a predetermined gap, A discharging portion including a ground terminal; An external electrode provided on the discharge unit and contacting the dummy external terminal; a ground electrode provided on the discharge unit and in contact with the ground terminal; and a discharge electrode which is filled between the dummy external terminal and the ground terminal, Wherein both the external electrode and the ground electrode are exposed on an upper surface of the cover portion, and a transverse side of the external electrode and a transverse side of the ground electrode are on a side of the upper surface of the cover portion Can be located.

The connection pattern, the discharge pattern, and the ground pattern may include a vertical projection area of the region where the coil is formed in the coil part, and a connection pattern that electrically connects the ground terminal and the ground pattern. Or may be provided outside.

According to an aspect of the present invention, there is provided a common mode filter comprising: a substrate made of a magnetic material; A first primary external terminal provided at one end of the primary coil; A second primary outer terminal provided at the other end of the primary coil; A first secondary external terminal provided at one end of a secondary coil magnetically coupled to the primary coil; A second secondary external terminal provided at the other end of the secondary coil; A first discharge pattern electrically connected to the first primary external terminal; A second discharge pattern electrically connected to the second primary external terminal; A third discharge pattern electrically connected to the first secondary external terminal; A fourth discharge pattern electrically connected to the second secondary external terminal; A first ground pattern spaced apart from the first discharge pattern by a predetermined gap; A second ground pattern spaced apart from the second discharge pattern by a predetermined gap; A third ground pattern spaced apart from the third discharge pattern by a predetermined distance; A fourth ground pattern spaced apart from the fourth discharge pattern by a predetermined gap; A connection pattern electrically connected to the first ground pattern, the second ground pattern, the third ground pattern, and the fourth ground pattern; A first ground terminal electrically connected to the connection pattern; A second ground terminal provided opposite to the first ground terminal and electrically connected to the connection pattern; A first primary external electrode electrically connected to the first primary external terminal and the first discharge pattern; A second primary outer electrode electrically connected to the second primary discharge terminal and the second discharge pattern; A first secondary external electrode electrically connected to the first secondary external terminal and the third discharge pattern; A second secondary external electrode electrically connected to the second secondary external terminal and the fourth discharge pattern; A first ground electrode in contact with the first ground terminal; A second ground electrode in contact with the second ground terminal; And a magnetic body portion filled between the first primary outer electrode, the second primary outer electrode, the first secondary outer electrode, the second secondary outer electrode, the first ground electrode, and the second ground electrode, , The first primary outer electrode, the second primary outer electrode, the first secondary outer electrode, and the second secondary outer electrode each have an upper surface and two sides exposed to the outside of the magnetic body, and the first ground electrode And the second ground electrode is located between two external electrodes selected from the first primary outer electrode, the second primary outer electrode, the first secondary outer electrode, and the second secondary outer electrode, As shown in FIG.

At this time, each of the first ground electrode and the second ground electrode may have an upper surface and a side surface exposed to the outside of the magnetic body.

Of the four sides forming the upper surface of the common mode filter, two sides contacting with the first ground electrode and the second ground electrode may be opposed to each other.

Of the four sides forming the upper surface of the common mode filter, two sides contacting with the first ground electrode and the second ground electrode are shorter than the remaining two sides of the upper surface of the common mode filter It can be long.

The first ground electrode may be positioned between the first primary outer electrode and the first secondary outer electrode and the second ground electrode may be positioned between the second secondary outer electrode and the second primary outer electrode. have.

An electronic device having a common mode filter according to an embodiment of the present invention includes: the common mode filter described above; A signal path pattern in which each of the external electrodes of the common mode filter is electrically connected; A ground path pattern in which each of the ground electrodes of the common mode filter is electrically connected; And an insulating substrate having the signal path pattern and the ground path pattern.

At this time, each of the external electrodes is electrically connected to the signal path pattern, each of the ground electrodes is electrically connected to the ground path pattern, and the conductive solder paste As shown in FIG.

The common mode filter according to an embodiment of the present invention configured as described above can maximize the distance between the external electrodes and the ground electrodes, thereby maximizing the width of the electrodes while avoiding short- .

Therefore, the common mode filter can be firmly fixed to an insulating substrate or the like, and the signal transmission efficiency can be improved, and the short circuit phenomenon can be minimized.

Further, in the electronic device having the common mode filter according to the embodiment of the present invention, the common mode filter is firmly fixed and the signal transmission efficiency is improved, and the defect due to the short-circuit phenomenon can be minimized.

1A is a perspective view schematically illustrating a common mode filter according to an embodiment of the present invention.
FIG. 1B is a perspective view schematically showing the arrangement relationship of the respective surfaces of the common mode filter according to FIG. 1A.
FIG. 2 is a perspective view schematically illustrating a common mode filter according to a modification of FIG. 1A.
3 is an exploded perspective view schematically illustrating a common mode filter according to an embodiment of the present invention.
4 is a plan view schematically illustrating a common mode filter according to an embodiment of the present invention.
FIG. 5 is a plan view schematically showing a common mode filter according to Comparative Example 1. FIG.
FIG. 6 is a plan view schematically showing a common mode filter according to Comparative Example 2. FIG.
FIG. 7 is a plan view schematically showing a common mode filter according to Comparative Example 3. FIG.
8 is a perspective view schematically illustrating an electronic device having a common mode filter according to an embodiment of the present invention.

The advantages and features of the present invention and the techniques for achieving them will be apparent from the following detailed description taken in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The present embodiments are provided so that the disclosure of the present invention is not only limited thereto, but also may enable others skilled in the art to fully understand the scope of the invention. Like reference numerals refer to like elements throughout the specification.

The terms used herein are intended to illustrate the embodiments and are not intended to limit the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is to be understood that the terms 'comprise', and / or 'comprising' as used herein may be used to refer to the presence or absence of one or more other components, steps, operations, and / Or additions.

For simplicity and clarity of illustration, the drawings illustrate the general manner of construction and the detailed description of known features and techniques may be omitted so as to avoid unnecessarily obscuring the discussion of the described embodiments of the invention. Additionally, elements of the drawings are not necessarily drawn to scale. For example, to facilitate understanding of embodiments of the present invention, the dimensions of some of the elements in the figures may be exaggerated relative to other elements. Like reference numerals in different drawings denote like elements, and like reference numbers may indicate similar elements, although not necessarily.

The terms "first", "second", "third", and "fourth" in the specification and claims are used to distinguish between similar components, if any, Or to describe the sequence of occurrences. It will be understood that the terminology used is such that the embodiments of the invention described herein are compatible under suitable circumstances to, for example, operate in a sequence other than those shown or described herein. Likewise, where the method is described as including a series of steps, the order of such steps presented herein is not necessarily the order in which such steps may be performed, any of the described steps may be omitted and / Any other step not described will be additive to the method.

Terms such as "left", "right", "front", "back", "upper", "bottom", "above", "below" And does not necessarily describe an unchanging relative position. It will be understood that the terminology used is intended to be interchangeable with the embodiments of the invention described herein, under suitable circumstances, for example, so as to be able to operate in a different direction than that shown or described herein. The term "connected" as used herein is defined as being directly or indirectly connected in an electrically or non-electrical manner. Objects described herein as "adjacent" may be in physical contact with one another, in close proximity to one another, or in the same general range or region as are appropriate for the context in which the phrase is used. The presence of the phrase "in one embodiment" herein means the same embodiment, although not necessarily.

Hereinafter, the configuration and operation effects of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1A is a perspective view schematically showing a common mode filter 1000 according to an embodiment of the present invention, FIG. 1B is a perspective view schematically showing a layout relationship of respective surfaces of a common mode filter 1000 according to FIG. FIG. 2 is a perspective view schematically showing a common mode filter 2000 according to a modification of FIG. 1A, FIG. 3 is an exploded perspective view schematically showing a common mode filter 1000 according to an embodiment of the present invention, 4 is a plan view schematically illustrating a common mode filter 1000 according to an embodiment of the present invention.

1A through 4, a common mode filter 1000 according to an embodiment of the present invention includes a substrate portion 1100, a coil portion 1200, a discharge portion 1300, and a cover portion 1400 .

At this time, the substrate portion 1100 may be made of a magnetic material.

Next, the coil portion 1200 may include a coil and an external terminal. Here, the coil and the external terminal may be formed on one or both surfaces of the insulating portion, and the external terminal may be formed to penetrate the insulating portion. Further, the coil may be formed by arranging the conductive pattern in a spiral shape, and the external terminal may be connected to one end of the coil.

In one embodiment, the coil and the external terminal may be formed in the same plane. In addition, an internal terminal may be connected to the other end of the coil.

In addition, the insulating portion formed with the coil and the external terminal may be laminated in two or more layers to form the coil portion 1200. Here, the coils formed on the different layers may be electrically connected to each other by further including vias (not shown) and the like which are in contact with the internal terminals.

In addition, the external terminals, the internal terminals, and the like may be formed to pass through between the upper surface and the lower surface of the insulating portion and be exposed toward both the upper surface direction and the lower surface direction.

The coil pattern may be formed so as to be exposed only in either the top surface direction or the bottom surface direction of the insulating portion.

At this time, though not shown, the primary coil may be formed in one layer and the secondary coil may be formed in another layer.

3, the coil portion 1200 may include a first coil layer 1210, a second coil layer 1220, and a third coil layer 1230. The first coil layer 1210, the second coil layer 1220,

Referring to the first coil layer 1210, a coil may be formed by spirally arranging the primary coil 1213P and the secondary coil at a predetermined interval in the first insulating portion 1211. [

A second primary external terminal 1212PS2 may be connected to one end of the primary coil 1213P. Although not shown in FIG. 3, a second secondary external terminal may be connected to one end of the secondary coil. A second ground terminal may be provided between the second primary external terminal 1212PS2 and the second secondary external terminal.

The first coil layer 1210 may further include a first primary external terminal 1212PS1, a first secondary external terminal 1212SS1, and a first ground terminal 1212G.

On the other hand, in the first coil layer 1210, the inner terminal may be connected to the other end of the primary coil 1213P and the secondary coil.

Next, referring to the third coil layer 1230, a coil, an external terminal, and a ground terminal may be formed on the third insulating portion to realize the third coil layer 1230.

That is, the primary coil 1233P is connected to the first primary external terminal 1232PS1, and the secondary coil 1233S is connected to the first secondary external terminal 1232SS1. A spiral coil may be formed in a state where the primary coil 1233P and the secondary coil 1233S are spaced apart from each other by a predetermined distance.

At this time, a first ground terminal 1232G1 may be further provided between the first primary external terminal 1232PS1 and the first secondary external terminal 1232SS1.

Further, the third coil layer 1230 may further include a second primary external terminal 1232PS2 and a second secondary external terminal, and between the second primary external terminal 1232PS2 and the second secondary external terminal, Terminal may be further provided.

On the other hand, in the third coil layer 1230, internal terminals can be connected to the other ends of the primary coil 1233P and the secondary coil 1233S.

Next, referring to the second coil layer 1220, the first primary external terminal 1222PS1, the first ground terminal 1222G1, the first secondary external terminal 1222SS1, A primary secondary terminal 1222PS2, a secondary secondary external terminal, and a second ground terminal may be provided to implement the second coil layer 1220. [ At this time, no additional coil may be provided in the second coil layer 1220, and internal terminals may be provided at positions corresponding to the internal terminals provided in the first coil layer 1210 and the third coil layer 1230 .

The discharge unit 1300 includes discharge patterns 1331, 1332, 1333, 1334, ground patterns 1341, 1342, 1343, 1344, a ground terminal, and a connection pattern 1350 ), And further may further include dummy external terminals.

The first dummy primary external terminal 1322PS1, the second dummy primary external terminal 1322PS2, the first dummy secondary external terminal 1322SS1 and the second dummy secondary external terminal 1322SS2 are connected to a first primary And may be formed at positions corresponding to the respective external terminals 1232PS1 to 1232SS2.

Also, the first discharge pattern 1331 may be electrically connected to the first primary external terminal 1232PS1 by being connected to the first dummy primary external terminal 1322PS1. The second discharge pattern 1332 may be electrically connected to the second primary external terminal 1232PS2 by being connected to the second dummy primary external terminal 1322PS2.

Also, the third discharge pattern 1333 may be electrically connected to the first secondary external terminal 1232SS1 by being connected to the first dummy secondary external terminal 1322SS1. The fourth discharge pattern 1334 may be electrically connected to the second secondary external terminal 1232SS2 by being connected to the second dummy secondary external terminal 1322SS2.

The first ground pattern 1341 is spaced apart from the first discharge pattern 1331 by a predetermined distance and the second ground pattern 1342 is spaced apart from the second discharge pattern 1332 by a predetermined distance. The third ground pattern 1343 is spaced apart from the third discharge pattern 1333 by a predetermined distance and the fourth ground pattern 1344 is spaced apart from the fourth discharge pattern 1334 by a predetermined distance .

Thus, when an overvoltage is applied to each of the external terminals, the overvoltage is discharged to the ground pattern 1341, 1342, 1343, 1344 from the discharge pattern 1331, 1332, 1333, 1334 electrically connected to each external terminal .

The first to fourth ground patterns 1341, 1342, 1343 and 1344 can be connected to the first ground terminal 1322G1 or the second ground terminal 1322G2 by the connection pattern 1350, The overvoltage may be transferred to the first or second ground terminal 1322G1 or 1322G2.

3, the connection pattern 1350, the discharge patterns 1331, 1332, 1333, and 1334, and the ground patterns 1341, 1342, 1343, and 1344 are provided outside the vertical projection region of the region where the coil is formed .

Accordingly, the problem that the flow of the magnetic flux generated in the coil is disturbed or disturbed due to the discharge portion 1300 can be reduced.

In addition, since the external electrodes 1420 and the ground electrodes 1430 are exposed on the same surface, the area required for mounting the common mode filter 1000 on the insulating substrate 3100 can be reduced, can do.

Meanwhile, the external electrodes 1420 may be electrically connected to the external terminals described above, and the ground electrodes 1430 may be electrically connected to the ground terminals described above.

At this time, the lower surface of each of the external electrodes 1420 is directly in contact with the dummy external terminals provided in the discharge part 1300, and the first coil layer 1210, the second coil layer 1220, The external electrodes 1420 are electrically connected to the external terminals by stacking the current collectors 1230 and the dischargers 1300 in contact with each other in the vertical direction. Each of the ground electrodes 1430 can be electrically connected to the ground terminal.

Here, each of the external electrodes 1420 may directly contact the discharge patterns 1330 at the same time as it is in direct contact with the dummy external terminals.

Next, a magnetic body part 1410 is provided on the discharge part 1300, and spaces between the external electrodes 1420 and the grounding electrodes 1430 are also filled by the magnetic body part 1410. [

Here, the magnetic substance part 1410 may be made of a magnetic material as in the case of the substrate part 1100.

In addition, the magnetic body part 1410 may be formed of a magnetic composite material in which magnetic materials such as ferrite are mixed with a synthetic resin.

The common mode filter 1000 may have a hexahedral shape, and the horizontal and vertical widths of the common mode filter 1000 may be the same or different.

On the other hand, the standard of electronic parts is generally standardized in order to facilitate the design of the circuit board.

For example, in a chip-type electronic component such as an inductor or a common mode filter 1000, a case where a width × height × height is 0.65 mm × 0.50 mm × 0.35 mm is an example of a standardized standard and is generally referred to as a "0605" standard.

Also, in the case where the width × length × height is 0.40 mm × 0.30 mm × 0.23 mm, this is an example of a standardized standard and is generally referred to as the "0403" standard.

As described above, the standardized common mode filter 1000 is generally longer than the horizontal dimension. In this drawing, the horizontal width of the common mode filter 1000 is longer than the vertical dimension. However, this is only for the sake of understanding, and does not exclude the case where the vertical width is longer than the horizontal width or the horizontal and vertical width are the same.

Referring to FIG. 1B, in order to facilitate understanding of the common mode filter 1000 according to an embodiment of the present invention, each surface of the common mode filter 1000 having a hexahedron shape is defined.

Hereinafter, the surface indicated by 1000-1 shown in Fig. 1B is referred to as a first surface, the surface indicated by 1000-2 is referred to as a second surface, the surface indicated by 1000-3 is referred to as a third surface, A face denoted by 1000-5 is referred to as a fifth face, and a face denoted by 1000-6 is referred to as a sixth face.

4, the side indicated by 1L is referred to as a first side, the side indicated by 2L is referred to as a second side, the side indicated by 1S is referred to as a third side, the side indicated by 2S is referred to as a fourth side .

In addition, the first and second sides may be understood as a transverse side, and the third and fourth sides may be understood as a longitudinal side.

This can be similarly applied to the external electrodes 1420 or the ground electrodes 1430. [

In the common mode filter 1000 according to an embodiment of the present invention, both the upper surfaces of the outer electrodes 1420 and the ground electrodes 1430 may be exposed to the first surface.

In addition, the two external electrodes PS1 and SS1 and one ground electrode G1 may be arranged so as to be in contact with the side of the first surface, that is, the first side. The remaining two external electrodes SS2 and PS2 and one ground electrode G2 may be arranged so as to be in contact with a second side opposed to the first side.

Also, the ground electrode 1430 may be positioned between the external electrodes 1420.

Further, each of the external electrodes 1420 may be located at an edge on the first surface.

The distance between the external electrode 1420 and the ground electrode 1430 and between the external electrode 1420 and the external electrode 1420 can be maximized.

In other words, the first primary outer electrode PS1 is in contact with the first side and the third side in two sides, the second primary outer electrode PS2 is in contact with the second side and the fourth side in both sides, and the first secondary external electrode SS1 may be arranged so that two sides contact the first side and the fourth side and the second secondary external electrode SS2 contacts the second side and the third side.

The first ground electrode G1 may be in contact with the first side, and the second ground electrode G2 may be in contact with the second side.

1A and 1B, the external electrodes 1420 are located at the corners of the first surface of the common mode filter 1000, so that three surfaces can be exposed to the outside of the common mode filter 1000. FIG.

That is, the first primary outer electrode PS1 may be exposed on the first side, the third side, and the fifth side. Similarly, the first secondary external electrode SS1, the second primary external electrode PS2, and the second secondary external electrode SS2 may be exposed in three planes.

In addition, the ground electrodes G1 and G2 contact the first side and the second side of the first surface of the common mode filter 1000, respectively, so that the two surfaces can be exposed to the outside of the common mode filter 1000. [

That is, the first ground electrode G1 may be exposed to the first surface and the third surface of the common mode filter 1000, respectively, and the second ground electrode G2 may be exposed to the first surface and the fourth surface, respectively .

Accordingly, since the distance between the external electrodes 1420 and the ground electrodes 1430 can be maximized, the risk of short circuiting between the electrodes when the common mode filter 1000 is mounted on the insulating substrate 3100 or the like is reduced .

In addition, when the common mode filter 1000 is mounted on the insulating substrate 3100 or the like, the larger the area where the external electrodes 1420 are connected to the conductive patterns on the insulating substrate 3100, the more common mode filter 1000 And the electric signal transmission efficiency is also increased.

Accordingly, since the common mode filter 1000 according to the embodiment of the present invention can maximize the distance between the external electrodes 1420 and the ground electrodes 1430, The width of the electrodes can be maximized. As a result, the adhesion strength and signal transmission efficiency of the common mode filter 1000 can be improved and the short-circuit phenomenon can be minimized.

In addition, the common mode filter 1000 according to an embodiment of the present invention can further improve the fixing strength because the external electrodes 1420 can be fixed to the insulating substrate 3100 or the like using three surfaces, The signal transmission efficiency can be further improved.

FIGS. 5 to 7 are plan views schematically showing a common mode filter according to Comparative Examples 1 to 3. FIG.

Table 1 shows the common mode filter according to Comparative Example 1, Comparative Example 2, and Comparative Example 3, and the common mode filter 1000 according to an embodiment of the present invention illustrated in FIG. 4, And the number of shot occurrences, which are different from each other.

Here, the common mode filters are made to have a so-called "0605 " size, i.e., a size of 0.65 mm x 0.50 mm x 0.35 mm in width x length x height.

MODEL1 denotes a common mode filter according to Comparative Example 1, MODEL2 denotes a common mode filter according to Comparative Example 2, MODEL3 denotes a common mode filter according to Comparative Example 3, and MODEL4 denotes a common mode filter 1000 illustrated in FIG. do.

The size of the external electrode 1420 for fixing the common mode filter 1000 to the insulating substrate 3100 or the like with a predetermined bonding strength may be proportional to the size of the common mode filter 1000.

Therefore, it is preferable that the lateral width of the external electrode 1420 is 0.15 times or more of the width of the common mode filter 1000. The longitudinal width of the external electrode 1420 is preferably 0.15 times or more of the longitudinal width of the common mode filter 1000.

If the size of the external electrode 1420 is too large as compared with the size of the common mode filter 1000, it is possible to prevent the external connection between the external electrodes 1420 and the external electrode 1420 in the process of coupling the common mode filter 1000 to the insulating substrate 3100, 1420 and the ground electrode 1430 may occur.

Therefore, it is preferable that the lateral width of the external electrode 1420 is 0.4 times or less the width of the common mode filter 1000. It is preferable that the vertical width of the external electrode 1420 is 0.4 times or less the vertical width of the common mode filter 1000.

Also, considering the error of the mounting process, it is preferable that the ground electrode 1430 is 0.15 times or more of the vertical width of the common mode filter 1000 to be stably connected to the conductive pattern formed on the insulating substrate 3100.

If the size deviation between the external electrode 1420 and the ground electrode 1430 becomes too large, a problem such that the common mode filter 1000 is twisted in the reflow process may occur. Therefore, It is preferable to appropriately adjust the size of the electrode 1430 in a predetermined range.

As shown in Table 1, when the distance b between the external electrode and the ground electrode is less than 100 micrometers, the rate of occurrence of a short circuit tends to increase.

Further, as the width of the external electrode increases, the fixing strength tends to be improved.

On the other hand, in the case of the common mode filter according to Comparative Example 1 and Comparative Example 2, in order to secure a fixing strength of 0.6 kgf or more, the outer electrode width a and the vertical width d should be 150um or more and 120um or more, respectively In this case, the gap (b) between the ground electrode and the ground electrode can not be sufficiently secured, and the shot occurrence rate has increased sharply.

In the case of the common mode filter 1000 according to an embodiment of the present invention, since the distance between the external electrode 1420 and the ground electrode 1430 can be maximized, It was confirmed that the short circuit phenomenon can be significantly reduced while ensuring a sufficient size of the electrode 1430 for securing the fixation strength.

In the case of the common mode filter according to the comparative example 3, the minimum distance e between the external electrodes and the distance b between the ground electrode and the external electrode are the same as the common mode filter MODEL4 according to the embodiment of the present invention And the risk of short-circuiting could be reduced. However, it was confirmed that when the lateral width or the vertical width of the external electrode had a similar condition to MODEL 4, the bonding strength tended to be lower than MODEL 4.

8 is a perspective view schematically illustrating an electronic device 3000 having a common mode filter according to an embodiment of the present invention.

8, an electronic device 3000 having a common mode filter according to an embodiment of the present invention includes a common mode filter 1000, a signal path pattern 3210, a ground path pattern 3220, 3100).

A signal path pattern 3210 for signal transmission and a ground path pattern 3220 can be formed on the surface of the insulating substrate 3100.

The external electrodes 1420 of the common mode filter 1000 may be electrically connected to the signal path pattern 3210 and the ground electrodes 1430 may be electrically connected to the ground path pattern 3220. A solder paste 3300 may be further provided between the external electrodes 1420 and the signal path pattern 3210 and between the ground electrodes 1430 and the ground path pattern 3220.

Here, as the size of the external electrodes 1420 and the size of the ground electrodes 1430 are increased, the common mode filter 1000 can be firmly fixed to the insulating substrate 3100. However, the conventional common mode filters 1000 have a limitation in increasing the size of the external electrodes 1420 in a range where the shorting phenomenon between the external electrode 1420 and the ground electrode 1430 does not occur. However, since the common mode filter 1000 according to an embodiment of the present invention has a structure in which the distance between the external electrode 1420 and the ground electrode 1430 can be maximized, the external electrode 1420 and the ground The size of the electrode 1430 can be sufficiently secured. Accordingly, the electronic device 3000 having the common mode filter according to the embodiment of the present invention can improve the signal transmission efficiency and efficiently remove the overvoltage when the static electricity is generated, and the common mode filter 1000 can be firmly Can be fixed.

1000, 2000: Common mode filter
1100: substrate part 1200: coil part
1210: first coil layer 1220: second coil layer
1230: third coil layer 1211: first insulating portion
1221: second insulation part 1231: third insulation part
1212PS1, 1222PS1, 1232PS1: Primary primary external terminal
1212PS2, 1222PS2, 1232PS2: 2nd primary external terminal
1212SS1, 1222SS1, 1232SS1: First secondary external terminal
1212SS2, 1222SS2, 1232SS2: Second secondary external terminal
1212G1, 1222G1, 1232G1: First ground terminal
1212G2, 1222G2, 1232G2: the second ground terminal
1300: discharging part 1301: fourth insulating part
1330: Discharge pattern 1340: Ground pattern
1350: Connection pattern
1322PS1: 1st dummy primary outer terminal 1322PS2: 2nd dummy primary outer terminal
1322SS1: 1st dummy secondary external terminal 1322SS2: 2nd dummy secondary external terminal
1322G1: first ground terminal 1322G2: second ground terminal
1400: cover part 1410: magnetic body part
1420: external electrode
PS1: first primary outer electrode PS2: second primary outer electrode
SS1: first secondary external electrode SS2: second secondary external electrode
1430: ground electrode
G1: first ground electrode G2: second ground electrode
3000: Electronic device with common mode filter
3100: Insulation substrate 3210: Signal path pattern
3220: Ground path pattern 3300: Solder paste

Claims (26)

A common mode filter having a hexahedron shape in which a coil portion including a discharge portion for discharging an overvoltage applied between a discharge pattern and a ground pattern and a coil including a coil in which a conductive pattern is arranged in a helical pattern is provided between a pair of magnetic bodies,
At least four external electrodes electrically connected to the coil and the discharge pattern, and at least two ground electrodes connected to the ground pattern,
At least one surface of each of the external electrodes and the ground electrodes is exposed to a first surface, which is at least one of six surfaces of the common mode filter,
Wherein one of the two external electrodes of the external electrodes and one of the ground electrodes of one of the ground electrodes contacts all of the first sides of the first surface,
Common mode filter.
The method according to claim 1,
The external electrodes and the ground electrode of the external electrodes and the ground electrodes that do not touch one side of the first side are all in contact with the second side opposing the first side
Common mode filter.
The method of claim 2,
Wherein the first side includes a third side and a fourth side that are shorter in length than the first side
Common mode filter.
The method of claim 3,
The side of each of the external electrodes which is in contact with the first side or the second side is longer than the side of each of the sides of the external electrodes which does not contact the first side or the second side,
Common mode filter.
The method of claim 2,
Wherein at least one side of each of the sides of the external electrodes is at least one side of the sides of the first surface that abuts at least one side except for the first side or the second side
Common mode filter.
The method of claim 3,
Wherein at least one side of each of the sides of each of the external electrodes is connected to the third side or the fourth side
Common mode filter.
The method according to claim 1,
Wherein at least one external electrode of the external electrodes includes a surface exposed to a third surface sharing the first side with the first surface
Common mode filter.
The method of claim 6,
Wherein at least one external electrode of the external electrodes
A surface exposed to at least one of a fifth surface sharing the third side with the first surface and a sixth surface sharing the fourth side with the first surface,
And a third side that is exposed to a third side that shares the first side with the first side
Common mode filter.
The method according to claim 1,
The ratio of the lateral width to the longitudinal width of the external electrode
Wherein the ratio of the width to the width of the first surface is 0.9 to 1.1 times
Common mode filter.
The method of claim 9,
Wherein a width of the external electrode in a direction parallel to the first side is 0.15 to 0.4 times the length of the first surface
Common mode filter.
The method of claim 10,
The minimum value of the length of one side of the ground electrode is 0.15 times or more of the length of the shortest side of the sides of the first surface
Common mode filter.
The method according to claim 1,
The discharge unit
A dummy external terminal electrically connected to the discharge pattern;
A ground terminal contacting the ground electrode; And
A connection pattern for electrically connecting the ground terminal and the ground pattern;
/ RTI >
Wherein the connection pattern, the discharge pattern, and the ground pattern are provided outside the vertical projection area of the area where the coil is formed in the coil part
Common mode filter.
In a common mode filter including four external electrodes and two ground electrodes,
Wherein the first side of the common mode filter comprises a first side, a second side opposite to the first side, a third side and a fourth side opposite to the third side,
Wherein one surface of each of the external electrodes and the ground electrodes is exposed on the first surface,
One of the two external electrodes and one of the ground electrodes is in contact with the first side,
One of the external electrodes and one of the ground electrodes is not in contact with the first side, and one side of each of the electrodes is in contact with the second side
Common mode filter.
14. The method of claim 13,
Wherein at least one side selected from the sides of each of the external electrodes which is not in contact with the first side or the second side is in contact with the third side or the fourth side
Common mode filter.
15. The method of claim 14,
Wherein the first side and the second side are longer than the third side and the fourth side
Common mode filter.
16. The method of claim 15,
Each of the sides of each of the external electrodes which is in contact with the first side or the second side is longer than the sides of the sides of the external electrodes which are in contact with the third side or the fourth side,
Common mode filter.
A common mode filter having a hexahedron shape having a first side larger than a lateral side in a transverse direction and including four external electrodes and two ground electrodes,
Wherein each of the four external electrodes is located at four corners of the first surface and shares each of the two external sides with the first surface,
The two ground electrodes share a lateral side of the first surface, and are spaced apart from the external electrodes between the external electrodes
Common mode filter.
A base portion made of a magnetic material;
A coil portion provided on the base portion and including a coil having a conductive pattern arranged in a spiral shape and an external terminal connected to an end portion of the coil;
A dummy external terminal which is provided on the coil part and is in contact with the external terminal, a discharge pattern electrically connected to the dummy external terminal, a ground pattern spaced apart from the discharge pattern by a predetermined gap, A discharging portion including a ground terminal;
An external electrode provided on the discharge unit and contacting the dummy external terminal; a ground electrode provided on the discharge unit and in contact with the ground terminal; and a discharge electrode which is filled between the dummy external terminal and the ground terminal, A cover portion including a covering magnetic body portion;
, ≪ / RTI &
Both the external electrode and the ground electrode are exposed to the upper surface of the cover portion,
The transverse sides of the external electrodes and the transverse sides of the ground electrodes are located on the side of the upper surface of the cover part
Common mode filter.
19. The method of claim 18,
The discharge unit
A connection pattern for electrically connecting the ground terminal and the ground pattern;
Further comprising:
Wherein the connection pattern, the discharge pattern, and the ground pattern are provided outside the vertical projection area of the area where the coil is formed in the coil part
Common mode filter.
A base portion made of a magnetic material;
A first primary external terminal provided at one end of the primary coil;
A second primary outer terminal provided at the other end of the primary coil;
A first secondary external terminal provided at one end of a secondary coil magnetically coupled to the primary coil;
A second secondary external terminal provided at the other end of the secondary coil;
A first discharge pattern electrically connected to the first primary external terminal;
A second discharge pattern electrically connected to the second primary external terminal;
A third discharge pattern electrically connected to the first secondary external terminal;
A fourth discharge pattern electrically connected to the second secondary external terminal;
A first ground pattern spaced apart from the first discharge pattern by a predetermined gap;
A second ground pattern spaced apart from the second discharge pattern by a predetermined gap;
A third ground pattern spaced apart from the third discharge pattern by a predetermined distance;
A fourth ground pattern spaced apart from the fourth discharge pattern by a predetermined gap;
A connection pattern electrically connected to the first ground pattern, the second ground pattern, the third ground pattern, and the fourth ground pattern;
A first ground terminal electrically connected to the connection pattern;
A second ground terminal provided opposite to the first ground terminal and electrically connected to the connection pattern;
A first primary external electrode electrically connected to the first primary external terminal and the first discharge pattern;
A second primary outer electrode electrically connected to the second primary discharge terminal and the second discharge pattern;
A first secondary external electrode electrically connected to the first secondary external terminal and the third discharge pattern;
A second secondary external electrode electrically connected to the second secondary external terminal and the fourth discharge pattern;
A first ground electrode in contact with the first ground terminal;
A second ground electrode in contact with the second ground terminal; And
A magnetic body portion filled between the first primary outer electrode, the second primary outer electrode, the first secondary outer electrode, the second secondary outer electrode, the first ground electrode, and the second ground electrode;
/ RTI >
Wherein each of the first primary outer electrode, the second primary outer electrode, the first secondary outer electrode, and the second secondary outer electrode has an upper surface and two sides exposed to the outside of the magnetic body,
Wherein the first ground electrode is located between two external electrodes selected from the first primary outer electrode, the second primary outer electrode, the first secondary outer electrode, and the second secondary outer electrode, Is located between the other two external electrodes
Common mode filter.
The method of claim 20,
Each of the first ground electrode and the second ground electrode has an upper surface and a side surface exposed to the outside of the magnetic body portion
Common mode filter.
23. The method of claim 21,
Among the four sides constituting the upper surface of the common mode filter, two sides which are in contact with the first ground electrode and the second ground electrode are opposed to each other
Common mode filter.
23. The method of claim 22,
Wherein two sides of the four sides of the common mode filter that are in contact with the first ground electrode and the second ground electrode are longer than the remaining two sides of the upper surface of the common mode filter
Common mode filter.
24. The method of claim 23,
Wherein the first ground electrode is located between the first primary outer electrode and the first secondary outer electrode
And the second ground electrode is positioned between the second secondary outer electrode and the second primary outer electrode
Common mode filter.
A common mode filter according to any one of claims 1 to 24;
A signal path pattern in which each of the external electrodes of the common mode filter is electrically connected;
A ground path pattern in which each of the ground electrodes of the common mode filter is electrically connected; And
An insulating substrate having the signal path pattern and the ground path pattern;
Containing
An electronic device having a common mode filter.
26. The method of claim 25,
A conductive solder paste electrically connecting each of the external electrodes to the signal path pattern, electrically connecting each of the ground electrodes to the ground path pattern, and physically fixing the common mode filter to the insulating substrate, Included
An electronic device having a common mode filter.

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