KR20200117843A - Complex component and electronic device having the same - Google Patents

Abstract

According to the embodiments of the present invention, a complex element includes a laminated structure, a capacitor part provided in the laminated structure, a pair of discharge electrodes disposed to face each other in at least a part thereof, and an air gap having an area larger than a discharge received therein. In addition, the complex element includes an overvoltage protecting part formed to be spaced from the capacitor part in the laminated structure, and a first external electrode and a second external electrode formed to face each other at opposite outer sides of the laminated structure and connected with the capacitor part and the overvoltage protecting part. Therefore, in the composition device according to the embodiments of the present invention, when the discharge area is provided between the discharge electrodes, the air gap having the area larger than the discharge area is interposed between the discharge electrodes such that the discharge area is received in the air gap. Accordingly, the discharge area may be formed to be spaced apart from the sheet without contact with the sheet. Therefore, the discharge area does not make contact with the inner surface of the laminated structure surrounding the discharge area. A heat blocking area, which is a specific space, is provided around the discharge area. Accordingly, when an overvoltage such as ESD and the like is bypassed by passing through the discharge area, heat emitted from the discharge area may be prohibited or prevented from being transmitted to the laminated structure due to the heat blocking area.

Description

Complex component and electronic device having the same

The present invention relates to a composite device and a battery device having the same, and more particularly, to a composite device including a capacitor unit and an overvoltage protection unit, and an electronic device having the same.

Electronic circuits require overvoltage protection devices such as varistors and suppressors to protect electronic devices from overvoltages such as ESD applied from the outside to the electronic devices. That is, an overvoltage protection element is required to prevent an overvoltage higher than the driving voltage of the electronic device from being applied from the outside.

Recently, in order to reduce the area occupied by these components in response to miniaturization of electronic devices, a composite device in which at least two or more having different functions or characteristics are stacked has been manufactured. For example, the composite device includes two or more internal electrodes, a capacitor portion including at least two or more sheets provided therebetween, a sheet provided with gaps, and first and second discharge electrodes provided up and down with a sheet provided with gaps therebetween. It includes a suppressor type overvoltage protection unit. Here, the overvoltage protection unit is bonded or coupled to the upper or lower portion of the capacitor unit, and thus a composite device including the overvoltage protection unit and the capacitor unit is provided.

The first discharge electrode and the second discharge electrode are formed such that their respective end portions are exposed or connected to the lower and upper portions of the voids, respectively. In other words, the distal end of the first discharge electrode and the distal end of the second discharge electrode are provided so as to overlap each other, and a void is provided between the distal end of the first discharge electrode and the distal end of the second discharge electrode.

A region between the distal end of the first discharge electrode and the distal end of the second discharge electrode, that is, a gap, is a path for bypassing an overvoltage such as ESD, and serves to protect against an overvoltage such as ESD.

However, when an overvoltage such as ESD passes through the voids, high temperature heat is generated in the discharge region. In addition, the heat is transferred to the sheet in contact with or around the discharge region, and accordingly, grains may grow inside the sheet, and thus, there is a problem that a leakage current is generated. This becomes a factor that deteriorates the performance of the high voltage protection unit and further, the composite device as a whole.

Korean Patent Publication No. 2016-0131843

The present invention provides a composite device including a capacitor unit and an overvoltage protection unit, and an electronic device having the same.

The present invention provides a composite device having improved resistance to overvoltage and an electronic device having the same.

A composite device according to an embodiment of the present invention includes a laminate; A capacitor part provided in the stacked body; A pair of discharge electrodes disposed so as to have a discharge region therebetween, at least partially facing each other, and a void provided in a larger area than the discharge region, wherein the discharge region is accommodated therein, and in the stacked body An overvoltage protection unit spaced apart from the capacitor unit; And first and second external electrodes formed to face each other on both outer sides of the stacked body and connected to the capacitor unit and the overvoltage protection unit.

The void may have a shape extending outward of the discharge region while receiving the discharge region therein.

The pores may have a shape whose thickness decreases as the edge region is further away from the discharge region.

The voids are divided into a first space, an intermediate space, and a second space in order from the lower part of the thickness direction to the upper part, and the first and second spaces have a length in a direction crossing the thickness direction compared to the intermediate space. It is long, and the edge regions of the first and second spaces may have a shape whose thickness decreases as the distance from the discharge region increases.

The first and second spaces may have a shape whose thickness decreases as the distance from the center of the extension direction to the discharge region increases.

The angle θ formed by the surfaces facing each other in the vertical direction in the edge region of the void may be 0.1° to 50°.

Each of the length (L _S ) and width (W _S ) of the void may be 5% to 80% of the length (L _C ) and width (W _C ) of the composite device.

Each of the length (L _S ) and width (W _S ) of the void may be 1.5 times or more and 50 times or less of the maximum thickness H _S of the void.

The void may have a shape symmetrical in at least one of a length, a width, and a thickness direction.

The overvoltage protection unit includes a plurality of the voids, and the plurality of voids are arranged in a vertical direction or arranged on the same plane.

A composite device according to an embodiment of the present invention includes a laminate; An overvoltage protection unit including discharge electrodes disposed to be spaced apart from each other in the stacked body, and a void having a horizontal distance formed longer than a separation distance between the discharge electrodes in the stacked body; A functional unit provided in the stacked body and having a function different from that of the overvoltage protection unit; And an external electrode formed outside the stacked body and connected to the functional unit and the overvoltage protection unit.

The void includes at least a discharge region formed between the discharge electrodes and a heat blocking region formed outside the discharge region.

The edge region of the void has a shape whose thickness decreases as the distance from the discharge region increases.

The functional unit has at least one of a capacitor unit and a noise filter unit.

The functional unit includes a noise filter unit, the noise filter unit includes at least one coil pattern and lead electrodes connected to the coil pattern, and the voids are provided in the same number as the number of the lead electrodes.

Each of the length (L _S ) and width (W _S ) of the void may be 3% to 45% of the length (L _C ) and width (W _C ) of the composite device.

The electronic device according to the embodiments of the present invention includes an internal circuit, and the composite device according to the embodiments is provided in the internal circuit.

The composite element is bypassed through the internal circuit.

According to the composite device according to the embodiment of the present invention, in providing a discharge region between the discharge electrodes, a void having a larger area than the discharge region is provided between the discharge electrodes, and the discharge region is accommodated in the void. To form. Accordingly, the discharge area may be formed to be spaced apart without contacting the sheet.

Accordingly, the discharge region does not come into contact with the inner surface of the stacked body around it, and a heat shield region, which is a predetermined space, is provided around the discharge region. Accordingly, when an overvoltage such as ESD passes through the discharge region and is bypassed, it is possible to suppress or prevent heat generated in the discharge region from being transferred to the laminate by the heat blocking region.

For this reason, it is possible to suppress the growth of grains in the laminate by the heat generated from the discharge region. That is, resistance due to overvoltage or heat can be improved. Accordingly, it is possible to suppress or prevent leakage current from being generated by the heat generated in the discharge region, and thereby suppress or prevent quality deterioration of the overvoltage protection unit or the composite element.

1 is a three-dimensional view as viewed from the outside of a composite device according to a first embodiment of the present invention
2 is an exploded perspective view of a composite device according to a first embodiment of the present invention
3 is a cross-sectional view of a composite device according to a first embodiment of the present invention, taken along line AA′ of FIG. 1
4 is an enlarged view of a part of an overvoltage protection unit of a composite device according to a first embodiment of the present invention
5 is a plan view as viewed from above of an overvoltage protection unit of the composite device according to the first embodiment of the present invention;
6 is an enlarged view of a part of an overvoltage protection unit according to a first modified example of the first embodiment of the present invention
7 is an enlarged view of a part of an overvoltage protection unit according to a second modified example of the first embodiment
8 to 11 are enlarged views of a part of the overvoltage protection unit according to the third to sixth modifications of the first embodiment.
12 is an enlarged view of a part of an overvoltage protection unit according to a seventh modified example of the first embodiment
13 is an enlarged view of a part of the overvoltage protection unit according to the eighth modified example of the first embodiment.
14 is an enlarged view of an overvoltage protection unit of a composite device according to a ninth modified example of the first embodiment;
15 is an enlarged view illustrating an overvoltage protection unit of a composite device according to a tenth modification example of the first embodiment;
16 is a cross-sectional view showing a composite device according to an eleventh modified example of the first embodiment;
17 is a cross-sectional view showing a composite device according to a twelfth modification example of the first embodiment;
18 and 19 are block diagrams of a composite device according to embodiments and modifications of the present invention
20 and 21 are views showing an example in which a composite device according to embodiments and modifications of the present invention is installed to connect a metal case and an internal circuit using a contact unit
22 is a three-dimensional view as viewed from the outside of a composite device according to a second embodiment of the present invention
23 is an exploded perspective view of a composite device according to a second embodiment of the present invention
24 is a cross-sectional view of a composite device according to a second embodiment of the present invention, taken along line AA′ of FIG. 22
25 is an exploded perspective view of a composite device according to a third embodiment of the present invention

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the present embodiments make the disclosure of the present invention complete, and the scope of the invention to those of ordinary skill in the art. It is provided to be fully informed.

1 is a three-dimensional view of a composite device according to a first embodiment of the present invention as viewed from the outside. 2 is an exploded perspective view of a composite device according to the first embodiment of the present invention. 3 is a cross-sectional view of a composite device according to a first embodiment of the present invention, taken along line A-A' of FIG. 1. 4 is an enlarged view of a part of an overvoltage protection unit of the composite device according to the first embodiment of the present invention. 5 is a plan view as viewed from above of an overvoltage protection unit of a composite device according to a first embodiment of the present invention.

1 to 3, the composite device according to the first embodiment of the present invention includes a laminate 1000 in which a plurality of sheets 100; 101 to 109 are stacked, and provided in the laminate 1000, and The capacitor unit 2000 having the internal electrodes 200 (201 to 206) of the, and the discharge electrode 310; 311, 312, and the overvoltage protection unit 3000 to protect the overvoltage such as ESD by having a void 320 Includes. For example, the capacitor unit 2000 may be provided in the stacked body 1000, and the overvoltage protection unit 3000 may be provided above or below the capacitor unit 2000. That is, the capacitor unit 2000 and the overvoltage protection unit 3000 are stacked inside the stacked body 1000 to implement a composite device.

In addition, the composite device according to the first embodiment includes external electrodes 4100, 4200; 4000 formed on two opposite sides of the stacked body 1000 and connected to the capacitor unit 2000 and the overvoltage protection unit 3000. It may contain more.

Such a composite element may be provided between a conductor and an internal circuit, for example, a metal case and an internal circuit, that is, a PCB, which the user of the electronic device can contact. The composite element functions as an antenna that supplies communication signals from the outside, and functions as an overvoltage protection element that bypasses overvoltage such as ESD to the ground terminal of the PCB and blocks electric shock voltage.

1. Laminate

The stacked body 1000 may be provided in a substantially hexahedral shape. That is, the stacked body 1000 has a predetermined length and width, respectively, in one direction (for example, the X direction) and the other direction (for example, the Y direction) perpendicular to each other in the horizontal direction, and the vertical direction (for example, Z Direction) may be provided in a substantially hexahedral shape having a predetermined height. That is, when the arrangement direction of the first external electrode 4100 and the second external electrode 4200 is the X direction, a direction orthogonal to the horizontal direction may be the Y direction and the vertical direction may be the Z direction. Here, the length in the X direction may be greater than the width in the Y direction and the height in the Z direction, and the width in the Y direction may be the same as or different from the height in the Z direction. When the width (Y direction) and height (Z direction) are different, the width may be larger or smaller than the height. For example, the ratio of length, width, and height may be 2-5:1:0.3-1. That is, the length (X direction) based on the width may be about 2 to 5 times larger than the width, and the height may be 0.3 to 1 times larger than the width. However, the size of the X, Y, and Z directions may be variously modified according to the internal structure of the electronic device to which the composite device is connected, the shape of the composite device, etc. as an example.

The stacked body 1000 may be formed by stacking a plurality of sheets 100 (101 to 109). That is, the stacked body 1000 may be formed by stacking a plurality of sheets 100 having a predetermined length in the X direction, a predetermined width in the Y direction, and a predetermined thickness in the Z direction. Accordingly, the length and width of the stacked body 1000 may be determined by the length and width of the sheet 100, and the height of the stacked body 1000 may be determined by the number of stacked sheets 100. Meanwhile, the plurality of sheets 100 constituting the stacked body 1000 may be formed using a dielectric material such as MLCC, LTCC, or HTCC. Here, the MLCC dielectric material includes at least one of BaTiO ₃ and NdTiO ₃ as a main component and at least one of Bi ₂ O ₃ , SiO ₂ , CuO, MgO, ZnO is added, and the LTCC dielectric material is Al ₂ O ₃ , SiO ₂ , It may contain a glass material. In addition, the sheet 100 is one of BaTiO ₃ , NdTiO ₃ , Bi ₂ O ₃ , BaCO ₃ , TiO ₂ , Nd ₂ O ₃ , SiO ₂ , CuO, MgO, Zn0, Al ₂ O ₃ in addition to MLCC, LTCC, HTCC It may be formed of a material including the above. In addition, the sheet 100 may be formed of a material having varistor properties, such as a Pr-based, Bi-based, or ST-based ceramic material, in addition to the above materials. Of course, the sheet 100 may be formed by mixing MLCC, LTCC, HTCC, and materials having varistor properties. For example, the sheet 100 may include BaTiO ₃ , NdTiO ₃ , Bi ₂ O ₃ , ZnO, TiO ₂ , SiO ₂ , Al ₂ O ₃ , B ₂ O ₃ . In addition, the sheet 100 may adjust the dielectric constant or the relative dielectric constant by adjusting the content of these materials. For example, the sheet 100 is BaTiO ₃ and SrTiO to at least increase the one content in the ₃ can increase the dielectric constant or relative permittivity, NdTiO ₃ and SiO to increase the at least one content in the _second dielectric constant or relative permittivity Can be lowered.

In addition, all of the plurality of sheets 100 may be formed to have the same thickness, and at least one may be formed to be thicker or thinner than the others. For example, the sheet of the overvoltage protection unit 3000 may be formed to have a different thickness than the sheet of the capacitor unit 2000, and the sheet of the overvoltage protection unit 3000 may be formed to be thicker than the sheet of the capacitor unit 2000. have. That is, the thickness of each sheet of the overvoltage protection unit 3000 may be thicker than the thickness of each sheet of the capacitor unit 2000. However, the thickness of each sheet of the overvoltage protection unit 3000 may be thinner than the thickness of each sheet of the capacitor unit 2000 or may be the same. In addition, at least one of the sheets of the overvoltage protection unit 3000 may be thicker than other sheets, and at least one of the sheets of the capacitor unit 2000 may be thicker than other sheets. In this case, a sheet thicker than other sheets among the sheets of the capacitor unit 2000 may be thicker than a sheet having a thinner thickness among the sheets of the overvoltage protection unit 3000. That is, at least one of the plurality of sheets 100 may be formed to have a different thickness than other sheets.

In addition, the thickness of the plurality of sheets 100 may be 1 μm to 4000 μm, and preferably 2 μm to 1000 μm. As described above, all of the plurality of sheets 100 may be formed to have the same thickness, and at least one may be formed to be thicker or thinner than the others.

In addition, the thickness and the number of stacks of the sheet 100 may be adjusted according to the size of the composite device. That is, when applied to a composite device having a small size, the sheet 100 may be formed to have a thin thickness, and when applied to a composite device having a large size, the sheet 100 may be formed to have a thick thickness. In addition, when the sheets 100 are stacked in the same number, the size of the composite device may be small, and the thickness may decrease as the height decreases, and the thickness of the composite device may increase as the size of the composite device increases. Of course, a thin sheet can be applied to a large-sized composite device, in which case the number of sheets stacked increases. In this case, the sheet 100 may be formed to a thickness that is not destroyed when ESD is applied. That is, even if the number or thickness of the sheets 100 is differently formed, at least one sheet may be formed with a thickness that is not destroyed by repeated application of ESD.

In addition, the stacked body 1000 may further include a lower cover layer (not shown) and an upper cover layer (not shown) provided respectively below and above the capacitor unit 2000. That is, the stacked body 1000 may include lower and upper cover layers provided on the lowermost layer and the uppermost layer, respectively. Of course, the lowermost sheet, that is, the first sheet 101 may function as a lower cover layer, and the uppermost sheet, that is, the ninth sheet 109 may function as an upper cover layer. The lower and upper cover layers provided separately from the sheet 100 may be formed to have the same thickness. However, the lower and upper cover layers may be formed in different thicknesses, for example, the upper cover layer may be formed thicker than the lower cover layer. Here, the lower and upper cover layers may be provided by stacking a plurality of magnetic sheets. In addition, a non-magnetic sheet, for example, a glass sheet may be further formed on the outer surfaces of the lower and upper cover layers made of magnetic sheets, that is, the lower and upper surfaces of the laminate 1000. However, the lower and upper cover layers may be formed of glassy sheets, and the surface of the laminate 1000 may be coated with a polymer or glass material. Meanwhile, the lower and upper cover layers may be thicker than the thickness of each of the sheets 100. That is, the cover layer may be thicker than the thickness of one sheet. Accordingly, when the lowermost and uppermost sheets, that is, the first and ninth sheets 101 and 109 function as lower and upper cover layers, may be formed thicker than each of the sheets 102 to 108 therebetween.

2. Capacitor

The capacitor part 2000 is formed inside the stacked body 1000, for example, may be provided below or above the overvoltage protection part 3000 as shown in FIGS. 2 and 3. . Meanwhile, the capacitor unit 2000 is referred to for convenience because a plurality of internal electrodes 200 (201 to 206) are formed separately from the overvoltage protection unit 3000, and a plurality of internal electrodes functioning as capacitors inside the stacked body 1000 ( 200) can be formed.

2 and 3, the capacitor unit 2000 is provided under the overvoltage protection unit 3000 and may include at least two or more internal electrodes, and at least two or more sheets provided therebetween. For example, the capacitor unit 2000 includes first to sixth sheets 101 to 106 and first to sixth internal electrodes 201 to 206 respectively formed on the first to sixth sheets 101 to 106 can do.

The plurality of internal electrodes 200 are formed such that one side is connected to the external electrodes 4000 (4100, 4200) formed to face each other in the X direction and the other side is spaced apart. For example, the first, third, and fifth internal electrodes 201, 203, and 205 are formed on the first, third, and fifth sheets 101, 103, and 105, respectively, in a predetermined area, and one end 1 is connected to the external electrode 4100 and the other end is formed to be spaced apart from the second external electrode 4200. In addition, the second, fourth, and sixth internal electrodes 202, 204, and 206 are formed on the second, fourth, and sixth sheets 102, 104 and 106, respectively, to have a predetermined area, and have one end of the second external electrode It is connected to the 4200 and the other end is formed to be spaced apart from the first external electrode 4100. That is, the plurality of internal electrodes 200 are alternately connected to any one of the external electrodes 4000 and are formed to overlap a predetermined area with the sheets 102 to 106 therebetween. In addition, the internal electrode 200 may have a length in the X direction and a width in the Y direction less than the length and width of the stacked body 1000. That is, the internal electrode 200 may be formed to be smaller than the length and width of the sheet 100. For example, the internal electrode 200 may be formed to have a length of 10% to 90% of the length of the stack 1000 or sheet 100 and a width of 10% to 90%. In addition, the internal electrodes 200 may be formed in an area of 10% to 90% of each area of the sheet 100. Meanwhile, each of the plurality of internal electrodes 200 may be formed in various shapes such as a square, a rectangle, a predetermined pattern shape, and a spiral shape having a predetermined width and interval. In the capacitor unit 2000, a capacitance is formed between the internal electrodes 200, respectively, and the capacitance can be adjusted according to the overlapping area of the internal electrodes 200 and the thickness of the sheets 100.

In addition, the first to sixth internal electrodes 201 to 206 may be formed in the same shape and area, and the overlapping area may also be the same. In addition, the capacitor unit 2000 and the sixth internal electrode 206 may overlap the external electrode 4000, and the first and sixth internal electrodes 201 and 206 are the remaining internal electrodes 202 to 205 It can be formed longer. That is, the first and sixth internal electrodes 201 and 206 are formed so that their distal ends partially overlap the first and second external electrodes 4100 and 4200, respectively, so that a parasitic capacitance is formed therebetween, so that the first and sixth internal electrodes The electrodes 201 and 206 may be formed, for example, about 10% longer than the remaining internal electrodes 202 to 205. In addition, the first and sixth internal electrodes 201 and 206 may have a region overlapping with the external electrode 4000 being formed wider than the remaining regions. For example, the first and sixth internal electrodes 201 and 206 may be formed to be about 10% wider than a region overlapping the external electrode 4000 or a region adjacent to the external electrode 4000 not overlapping. In this case, a region of the first and sixth internal electrodes 201 and 206 that does not overlap with the external electrode 4000 may be the same as the width of the remaining internal electrodes 202 to 205.

The internal electrode 200 may be formed of a conductive material. For example, the internal electrode 200 may be formed of a metal or a metal alloy including any one or more of Al, Ag, Au, Pt, Pd, Ni, and Cu. For the alloy, for example, an Ag and Pd alloy can be used. Each of the internal electrodes 200 (201 to 206) may have a thickness of 0.5 μm to 10 μm, respectively.

Meanwhile, it has been described that the capacitor unit 2000 described above includes the first to sixth sheets 101 to 106 and the first to sixth internal electrodes 201 to 206, but the number of internal electrodes is based on the above-described example. It is not limited and may be formed in a plurality of two or more, and the sheet may be provided in a number in which each of two or more internal electrodes can be formed.

3. Overvoltage protection

The overvoltage protection unit 3000 may include at least two discharge electrodes 310 (310, 312) formed to be spaced apart in a vertical direction, and at least one void 320 provided between the discharge electrodes 310. For example, the overvoltage protection unit 3000 includes first and second discharge electrodes 311 and 312 respectively formed on the eighth sheet 108, the seventh and eighth sheets 107 and 108, and the seventh The first discharge electrode 311 formed on the sheet, the second discharge electrode 312 formed on the eighth sheet 108, and the void 320 provided in the eighth sheet 108 or through the eighth sheet 108 ). Here, the second discharge electrode 312 may be described as being formed on the lower surface (lower surface) of the ninth sheet 109.

2 to 4, the first discharge electrode 311 and the second discharge electrode 312 according to the first embodiment are formed to have different heights. For example, the first discharge electrode 311 is provided below the second discharge electrode 312, and the second discharge electrode 312 is disposed above the first discharge electrode 311. In addition, the first discharge electrode 311 has one end connected to the second external electrode 4200, the other end is spaced apart from the first external electrode 4100, and the second discharge electrode 312 has one end connected to the first external electrode 4100. It is connected to the external electrode 4100 and the other end is formed to be spaced apart from the second external electrode 4200.

In addition, among the first and second discharge electrodes 311 and 312, the discharge electrode adjacent to the capacitor unit 2000, that is, the first discharge electrode 311 is connected to the same external electrode 400 as the adjacent internal electrode 200. Is formed. That is, the first discharge electrode 311 and the sixth internal electrode 206 adjacent thereto are connected to the second external electrode 4200, and the other second discharge electrode 312 is the first external electrode ( 4100).

In this way, when the discharge electrode 310 and the adjacent internal electrode 200 are connected to the same external electrode 4000, the ESD voltage is not applied to the inside of the electronic device even when the sheet 100 is deteriorated, that is, insulation is destroyed. That is, when the inner electrode 200 adjacent to the discharge electrode 310 is connected to different external electrodes 4000 and the sheet 100 is insulated and destroyed, the ESD voltage applied through the one external electrode 4000 is reduced to the discharge electrode 310. ) Flows to the other external electrode 4000 through the internal electrode 200 adjacent to the ). For example, when the first discharge electrode 311 is connected to the second external electrode 4200 and the sixth internal electrode 206 adjacent thereto is connected to the first external electrode 4200, the sheet 100 is damaged. Then, a conductive path is formed between the first discharge electrode 311 and the sixth internal electrode 206 so that the ESD voltage applied through the second external electrode 4200 is applied to the first discharge electrode 311 and the seventh dielectric breakdown. It flows to the sheet 107 and can be applied to the internal circuit through the first external electrode 4100 accordingly. In order to solve this problem, the sheet 100 may be formed to be thick, but in this case, there is a problem that the size of the electric shock prevention element increases. However, even when the discharge electrode 310 and the inner electrode 200 adjacent thereto are connected to the same external electrode 4000 and the sheet 100 is insulated and destroyed, the ESD voltage is not applied to the inside of the electronic device. In addition, it is possible to prevent the ESD voltage from being applied without increasing the thickness of the sheet 100.

The discharge electrode 310 may be formed of a conductive material. For example, the discharge electrode 310 may be formed of a metal or a metal alloy including any one or more of Ag, Au, Pt, Pd, Ni, Cu, and Al. For the alloy, for example, an Ag and Pd alloy can be used. In this case, the discharge electrode 310 may be formed of the same material as the internal electrodes 200 of the capacitor unit 2000. In addition, the discharge electrode 310 may be formed to a thickness of, for example, 1 μm to 25 μm, and may be formed to be smaller, larger or equal to the thickness of the internal electrode 200 of the capacitor unit 2000. have.

As described above, each of the first discharge electrode 311 and the second discharge electrode 312 is formed to extend in the longitudinal direction or the X direction of the stacked body 1000 so as to be connected to different external electrodes 4000. It is formed to face each other.

At this time, the formation position of the other end of the first discharge electrode 311 not connected to the external electrode 4000 overlaps with a partial position of the second discharge electrode 312, and the external electrode in the second discharge electrode 312 The formation position of the other end not connected to is overlapped with a partial position of the first discharge electrode 311.

In addition, the other end of the first discharge electrode 311 is located behind the other end of the second discharge electrode 312, and the other end of the second discharge electrode 312 is located behind the other end of the first discharge electrode 311. Is formed. Accordingly, the positions of the predetermined region including the other end of the first discharge electrode 311 (hereinafter, the end portion) and the predetermined region including the other end of the second discharge electrode 312 (hereinafter, the end portion) are the same. Or overlap. At this time, since the distal end of the first discharge electrode 311 and the distal end of the second discharge electrode 312 are formed to face each other, the distal end of the first discharge electrode 311 and the distal end of the second discharge electrode 312 are in the X direction. And the formation positions thereof are the same or overlap each other in the Y direction.

The void 320 may be provided in the eighth sheet 108 positioned between the first discharge electrode 311 and the second discharge electrode 312, and the distal end of the first discharge electrode 311 and the second discharge electrode Formed between the distal ends of (312). Further, the end portions of each of the first and second discharge electrodes 311 and 312 are formed to be exposed to the voids 320. In other words, the end portions of each of the first and second discharge electrodes 311 and 312 are connected to the void 320.

Here, a region between the distal end of the first discharge electrode 311 and the distal end of the second discharge electrode 312 is a path for bypassing an overvoltage such as ESD, and serves to protect against an overvoltage such as ESD. Therefore, hereinafter, for convenience of description, a region between the distal end of the first discharge electrode 311 and the distal end of the second discharge electrode 312 is referred to as a “discharge region 321”.

Meanwhile, when an overvoltage such as ESD passes through the discharge region 321, high temperature heat is generated in the discharge region 321. In addition, the heat is transferred to the stack or sheet in contact with or around the discharge region 321, and accordingly, grains may grow inside the stack, resulting in a leakage current. There is. This becomes a factor that deteriorates the performance of the overvoltage protection unit and furthermore the composite device.

Therefore, in the embodiment of the present invention, in providing the discharge region 321 between the discharge electrodes 311 and 312, the void 320 having a larger area than the discharge region 321 is formed by the discharge electrodes 311 and 312. It is provided between and is formed in a form in which the discharge region 321 is accommodated in the void 320. Accordingly, the discharge regions 321 may be formed to be spaced apart without contacting the inner surface of the laminate or the inner surface of the sheet.

To this end, the void 320 has its length (length in the X direction) (L _S ) and width (transition in the Y direction) (W _S ) of the discharge region 321 (length in the X direction) and width (length in the Y direction) ) Can be formed larger than. In addition, the distance in the horizontal direction of the void 320 may be longer than the separation distance between the first and second discharge electrodes 311 and 312. That is, the length (X-direction length (L _s ) and width (Y-direction length) (W _s ) of the void 320 may be formed to be longer than the Z-direction length, that is, the thickness (H _s ). And, the void 320 ) In the Z direction, that is, the thickness H _s may be the same as a separation distance between the first and second discharge electrodes 311 and 312.

For example, at least the length (length in the X direction) (L _S ) and the width (transition in the Y direction) (W _S ) of the void 320 is the length (length in the X direction) and the width (in the Y direction) of the discharge region 321 Length), and the Z-direction length, that is, the thickness H _S of the void 320 may be the same as the discharge region.

In this case, the discharge region 321 is a concept of a'empty space having a predetermined shape', but is regarded as a'shape' for convenience of explanation, and the lower portion of the discharge region 321 is the first discharge electrode 311 Is connected to or in contact with, and the upper part is connected to or in contact with the second discharge electrode 312, but the outer region of the discharge region 321 among the voids 320 is separated from the inner surface of the eighth sheet 108 without contacting , The size of the void 320 may be determined. Here, the inner surface of the eighth sheet 108 may mean an inner surface of the eighth sheet 108 that divides the void 320 or corresponds to a wall surface around the void 320.

In this way, the discharge region 321 is accommodated in the void 320, and a predetermined space is provided in an outer region of the discharge region 321. For example, a predetermined space is provided on both outer sides of the discharge area 321 based on the X direction and on both outer sides of the discharge area 321 based on the Y direction.

The discharge region 321 is formed in the void 320 to be accommodated, and a predetermined space provided outside the discharge region 321 serves to suppress or block the heat generated from the discharge region 321 from being transferred to the sheet Do it.

Accordingly, hereinafter, for convenience of description, the outer region of the discharge region 321 in the void 320 is referred to as a “heat blocking region 322”.

Reflecting the above definition and describing the void 320 again, the void 320 is a discharge region 321 which is a region between the end portion of the first discharge electrode 311 and the end portion of the second discharge electrode 312 and the It includes a heat blocking area 322 that is an area outside the discharge area 321. In addition, the void 320 may be filled with at least one of air, Ar gas, and N ₂ gas.

In the embodiment of the present invention, by providing the heat blocking region 322 outside the discharge region 321 as described above, the heat of the discharge region 321 is more specifically, the eighth sheet 108 ) Can be prevented or inhibited. This is because the discharge region 321 is not in contact with the eighth sheet 108 by the heat blocking region 322 and is spaced apart.

Meanwhile, although it is described that discharge occurs in the discharge region 321, discharge may occur outside the discharge region 321, that is, a part of the heat blocking region 322. However, the discharge occurs intensively in the overlapping region of the discharge electrodes 311 and 312, and thus the temperature of heat generated in the discharge region 321 is lower, so that the temperature of the heat generated in the heat blocking region 322 is lower. The area in which the, 322 overlaps is referred to as the discharge area 321, and the outer side thereof is referred to as the heat blocking area 322.

As described above, the void 320 is provided, and the length (length in the X direction) (L _S ) and the width (length in the Y direction) (W _S ) of the void 320 are the length (L _C ) and width ( W _C ) may be provided to be 5% to 80% of each. Preferably, the length of the void 320 (length in the X direction) (L _S ) is 10% to 60% of the length of the composite element (L _C ), and the width of the void 320 (length in the Y direction) (W _S ) It may be provided to be 10% to 70% of the width W _C of this composite device (see FIGS. 4 and 5).

On the other hand, when the length (length in the X direction) (L _S ) and width (length in the Y direction) (W _S ) of the void 320 is less than 5% of the length (L _C ) and width (W _C ) of the composite element, discharge Since the distance between the region 321 and the inner surface of the eighth sheet 108 is close, grains may be grown due to heat transfer, and a leakage current may be generated. Conversely, when the length (length in the X direction) (L _S ) and the width (length in the Y direction) (W _S ) of the void 320 exceeds 80% of the length (L _C ) and width (W _C ) of the composite element A crack may be generated in the overvoltage protection unit 3000 in the transverse direction due to energy generated during discharge of the overvoltage such as ESD.

In addition, based on the X direction, the length (A _S ) from the center of the discharge region 321 to the end of the void 320 is 5% to 80% of the half length (L _C /2) of the composite element. In the Y direction, the length from the center of the discharge region 321 to the end of the void 320, that is, the width (B _S ) is 5% to 80 of the half width (W _C /2) of the composite element It can be provided in %. Preferably, based on the X direction, the length (A _S ) from the center of the discharge region 321 to the end of the void 320 is 10% to 60% of the half length (LC/2) of the composite element, in the Y direction Based on, the length from the center of the discharge region 321 to the end of the void 320, that is, the width B _S is provided to be 10% to 70% of the half width W _C /2 of the composite element.

At this time, based on the X direction, the length (A _S ) from the center of the discharge region 321 to the end of the void 320 is less than 5% of the half length (L _C /2) of the composite element, or the Y direction As a standard, when the width B _S from the center of the discharge region 321 to the end of the void 320 is less than 5% of the half width (W _C /2) of the composite element, the discharge region 321 and the void ( Since the distance between the end of 320) or the inner surface of the eighth sheet 108 is close, grains may be grown due to heat transfer, and a leakage current may be generated.

Conversely, based on the X direction, the length (A _S ) from the center of the discharge region 321 to the end of the void 320 exceeds 80% of the half length (L _C /2) of the composite element, or in the Y direction On the basis of, when the width B _S from the center of the discharge region 321 to the end of the void 320 exceeds 80% of the half width (W _C /2) of the composite element, overvoltage such as ESD Cracks may be generated in the overvoltage protection unit 3000 in the transverse direction due to energy generated during discharge.

The thickness (length in the Z direction) of the void 320 is formed so that the thickness of the edge region is smaller than that of other regions in a direction intersecting with the thickness direction (Z direction) or in the extending direction of the void 320. It is formed so that the thickness of the end is the smallest.

In this case, the edge region of the void 320 may be provided so that the thickness gradually decreases toward the end thereof, and the thickness at the center is preferably the thickest. Accordingly, the thickness of an end of the gap 320 in a direction away from the discharge region 321 is the smallest, and the edge region may have a notch or a letter'V' shape.

The void 320 is preferably provided so that the thickness of the center is the thickest, and the thickness of the center may be 3 μm to 100 μm. Of course, the void 320 may have the thickest thickness at a position deviating from the center by a predetermined distance, and the thickness of this portion may be 3 μm to 100 μm.

As described above, the edge region of the void 320 is provided to decrease in thickness as the distance from the discharge region 321 increases, and the void 320 according to the first embodiment is as shown in FIGS. 3 and 4. Likewise, it may have a shape whose thickness gradually decreases from the center of the extension direction to the edge. More specifically, the void 320 has a shape in which the center in the X direction and the center in the Y direction are the same, and the thickness continuously decreases from the center to the discharge area. Accordingly, the center thickness of the void 320 is the thickest, and the portion farthest from the discharge region 321, that is, the thickness of the end is the thinnest.

In addition, in providing the voids 320 such that their thickness decreases in a direction away from the discharge region 321, as in the first embodiment, the thickness reduction slope may be formed to be variable rather than constant. Accordingly, as shown in FIG. 3, the inner surface of the sheet surrounding the void 320 may be formed to have a curvature or a curved surface.

Each of the length (L _S ) and width (W _S ) of the void 320 is preferably 1.5 times or more and 50 times or less of the thickness H _S of the void 320. Here, the'thickness of the void (H _S )'may be the thickest thickness, which may be the center thickness of the void 320.

On the other hand, when each of the length (L _S ) and width (W _S ) of the void 320 is less than 1.5 times the thickness (H _S ) of the void 320, the discharge region 321 and the inner surface of the stacked body 1000 Since the distance is close, grains due to heat transfer may grow, and thus leakage current may be generated. Conversely, when each of the length (L _S ) and width (W _S ) of the void 320 exceeds 50 times the thickness (H _S ) of the void 320, the energy generated during overvoltage discharge such as ESD Accordingly, cracks may occur in the overvoltage protection unit 3000 in the transverse direction.

At least the edge region of the voids 320 is provided to gradually decrease in thickness toward a direction away from the discharge region 321, in which case the angle θ of the edge region or the angle θ of the end thereof is 0.1° to 50° It may be, and it is preferably 0.5° to 30°.

Here, the angle θ of the edge region (hereinafter, the edge angle θ) refers to the angle of the surface facing up and down in the edge region of the void 320, for example, the eighth sheet 108 forming the void 320 ) Means the angle (θ) between.

On the other hand, when the edge angle θ is less than 0.1°, the distance between the discharge region 321 and the inner surface of the stacked body 1000 is close, so that grains due to heat transfer may grow, thereby generating a leakage current. I can. In addition, when the edge angle θ exceeds 50°, cracks may be generated in the overvoltage protection unit 3000 in the lateral direction due to energy generated during discharge of an overvoltage such as ESD.

In addition, the voids 320 may be symmetrical with respect to the center in the longitudinal direction, symmetrical in the width direction, and symmetrical with respect to the center in the thickness direction. In other words, the length of the heat blocking regions 322 on both outer sides of the discharge region 321 is the same in the length direction, and the heat blocking regions 322 on both outer sides of the discharge region 321 based on the width direction. ) Has the same length, and may have the same length in both directions based on the center of the thickness direction. In this case, when the voids 320 have a symmetrical shape, the heat blocking effect may be uniform, and the influence due to heat may be uniform.

Of course, the present invention is not limited thereto, and the void 320 may have an asymmetric shape in at least one of a length direction, a width direction, and a thickness direction. In this case, the influence of heat may be relatively non-uniform compared to the case of the symmetrical shape, but the discharge region 321 is superior in resistance to overvoltage compared to a conventional overvoltage protection unit in which the discharge region 321 contacts or is connected to the sheet.

The overvoltage protection unit 3000 as described above is provided to be stacked with the capacitor unit 2000, and thus the composite device according to the embodiment is provided to include the capacitor unit 2000 and the overvoltage protection unit 3000. In preparing a complex device having a plurality of functional units, that is, including the capacitor unit 2000 and the overvoltage protection unit 3000, the capacitor unit 2000 and the overvoltage protection unit 3000 may be manufactured and provided together. .

For example, after manufacturing the capacitor unit 2000 by stacking the first to seventh sheets 101 to 106 and the first to sixth internal electrodes 201 to 206, the first discharge on the seventh sheet 107 The electrode 311 and the eighth sheet 108, the second discharge electrode 312 on the eighth sheet 108, the second discharge electrode 312, and the ninth sheet 109 on the eighth sheet 108 It can be produced by laminating and sintering together. Here, although it has been described that the second discharge electrode 312 is formed on the eighth sheet 108, the second discharge electrode 312 may be formed on the lower surface (lower surface) of the ninth sheet 109. Accordingly, a composite device in which the capacitor unit 2000 and the overvoltage protection unit 3000 are bonded or coupled to each other may be provided.

As described above, in the embodiment, in providing the discharge regions 321 between the discharge electrodes 310, the discharge regions 321 are formed to be spaced apart from each other without contacting the stacked body 1000. That is, the air gap 320 is provided to have a larger area than the discharge region 321, and the overvoltage protection unit 3000 is provided so that the discharge region 321 is accommodated in the air gap 320. Accordingly, the discharge region 321 does not come into contact with the stacked body 1000 or sheet around the discharge region 321, and a heat shield region 322 is provided around the discharge region 321, which is a predetermined space. Therefore, when an overvoltage such as ESD is bypassed to the discharge region 321, the heat generated in the discharge region 321 passes through the heat blocking region 322, thereby preventing or preventing heat from being transferred to the sheet. I can. As a result, it is possible to suppress or prevent grain growth in the sheet due to heat generated from the discharge region 321, and in other words, resistance to overvoltage or heat is improved. Accordingly, it is possible to suppress or prevent leakage current from being generated by the heat generated in the discharge region, and thereby suppress or prevent quality deterioration of the overvoltage protection unit or the composite element.

4. External electrode

The external electrodes 4000 (4100, 4200) may be provided on two surfaces opposite to each other outside the stacked body 1000. For example, the external electrodes 4000 may be formed on two opposite surfaces of the stacked body 1000 in the X direction, that is, in the length direction. In addition, the external electrode 4000 may be connected to the internal electrode 200 and the discharge electrode 310 in the stack 1000. At this time, one of the external electrodes 4000 may be connected to an internal circuit such as a printed circuit board inside the electronic device, and the other may be connected to the outside of the electronic device, for example, a metal case. For example, the first external electrode 4100 may be connected to an internal circuit, and the second external electrode 4200 may be connected to a metal case. Further, the second external electrode 4200 may be connected to the metal case through a conductive member, for example, a contactor or a conductive gasket.

The external electrode 4000 may be formed in various ways. That is, the external electrode 4000 may be formed by immersion or printing using a conductive paste, or may be formed by various methods such as vapor deposition, sputtering, and plating. Meanwhile, the external electrode 4000 may be formed to extend on the surfaces in the Y direction and the Z direction. That is, the external electrode 4000 may be formed to extend from two surfaces opposite to each other in the X direction to four adjacent surfaces. For example, when immersed in the conductive paste, the external electrodes 4000 may be formed not only on two opposite sides in the X direction, but also on the front and rear surfaces in the Y direction, and the upper and lower surfaces in the Z direction. In contrast, when forming by a method such as printing, vapor deposition, sputtering, or plating, external electrodes 4000 may be formed on two surfaces in the X direction. That is, the external electrode 4000 may be formed not only on one side mounted on the printed circuit board and the other side connected to the metal case, but also on other areas according to a formation method or process condition. The external electrode 4000 may be formed of a metal having electrical conductivity. For example, the external electrode 4000 may be formed of one or more metals selected from the group consisting of gold, silver, platinum, copper, nickel, palladium, and alloys thereof. At this time, at least a portion of the external electrode 4000 connected to the internal electrode 200 and the discharge electrode 310, that is, formed on at least one surface of the stacked body 1000, and the internal electrode 200 and the discharge electrode 310 A portion of the connected external electrode 4000 may be formed of the same material as the internal electrode 200 and the discharge electrode 310. For example, when the internal electrode 200 and the discharge electrode 310 are formed of copper, at least a portion of the area of the external electrode 4000 in contact with them may be formed of copper. In this case, as described above, copper may be formed by immersion or printing using a conductive paste, or by deposition, sputtering, plating, or the like. Preferably, the external electrode 4000 may be formed by plating. In order to form the external electrode 4000 through the plating process, a seed layer may be formed on the upper and lower surfaces of the stacked body 1000 and then a plating layer may be formed from the seed layer to form the external electrode 4000. Here, at least a part of the external electrode 4000 connected to the internal electrode 200 and the discharge electrode 310 may be the entire side surface of the stack 1000 on which the external electrode 4000 is formed, or may be a partial region. .

In addition, the external electrode 4000 may further include at least one plating layer. The external electrode 4000 may be formed of a metal layer such as Cu or Ag, and at least one plating layer may be formed on the metal layer. For example, the external electrode 4000 may be formed by stacking a copper layer, a Ni plating layer, and an Sn or Sn/Ag plating layer. Of course, the plating layer may include a Cu plating layer and a Sn plating layer, and a Cu plating layer, a Ni plating layer, and a Sn plating layer may be stacked. In addition, the external electrode 4000 may be formed by mixing, for example, a multi-component glass frit containing 0.5% to 20% of Bi ₂ O ₃ or SiO ₂ as a main component with metal powder. In this case, the mixture of the glass frit and the metal powder may be prepared in a paste form and applied to both surfaces of the laminate 1000. In this way, since the glass frit is included in the external electrode 4000, the adhesion between the external electrode 4000 and the stacked body 1000 may be improved, and contact reaction between the electrodes inside the stacked body 1000 may be improved. In addition, after the conductive paste containing glass is applied, at least one plating layer is formed thereon to form the external electrode 4000. That is, a metal layer including glass and at least one plating layer may be formed thereon to form the external electrode 4000. For example, the external electrode 4000 may form a glass frit and a layer containing at least one of Ag and Cu, and then form a Ni plating layer and a Sn plating layer sequentially through electrolytic or electroless plating. In this case, the Sn plating layer may be formed to have the same or thicker thickness as the Ni plating layer. Of course, the external electrode 4000 may be formed of only at least one plating layer. That is, the external electrode 4000 may be formed by forming at least one plating layer by using at least one plating process without applying a paste. On the other hand, the external electrode 4000 may be formed to a thickness of 2 μm to 100 μm, the Ni plating layer is formed to a thickness of 1 μm to 10 μm, and the Sn or Sn/Ag plating layer is formed to a thickness of 2 μm to 10 μm. Can be formed.

Meanwhile, the external electrode 4000 may be formed to overlap the internal electrode 200 connected to the different external electrodes 4000 by a predetermined area. For example, portions of the first external electrode 4100 extending downward and upward of the stacked body 1000 may be formed to overlap a predetermined region of the internal electrodes 200. In addition, portions of the second external electrodes 4200 extending downward and upward of the stacked body 1000 may also be formed to overlap with predetermined regions of the internal electrodes 200. For example, portions of the external electrode 4000 extending upward and downward of the stacked body 1000 may be formed to overlap the first and sixth internal electrodes 201 and 206. That is, at least one of the external electrodes 4000 may extend to the upper and lower surfaces of the stacked body 1000, and at least one of the extended portions may be formed to partially overlap the internal electrode 200. In this case, the area of the internal electrode 200 overlapping the external electrode 4000 may be 1% to 10% of the total area of the internal electrode 200. In addition, the external electrode 4000 may increase an area formed on at least one of the upper and lower surfaces of the stacked body 1000 through a plurality of processes.

By overlapping the external electrode 4000 and the internal electrode 200 in this way, a predetermined parasitic capacitance may be generated between the external electrode 4000 and the internal electrode 200. For example, capacitance may be formed between the first and sixth internal electrodes 201 and 206 and extension portions of the first and second external electrodes 4100 and 4200. Accordingly, the capacitance of the composite device can be adjusted by adjusting the overlapping area of the external electrode 4000 and the internal electrode 200.

5. Surface modification member

A surface modification member (not shown) may be formed on at least one surface of the stacked body 1000. Such a surface modification member may be formed by distributing, for example, an oxide on the surface of the laminate 1000 before forming the external electrode 4000. Here, the oxide may be dispersed and distributed on the surface of the laminate 1000 in a crystalline or amorphous state. When the external electrode 4000 is formed by a plating process, the surface modification member may be distributed on the surface of the laminate 1000 before the plating process. That is, the surface modification member may be distributed before forming a part of the external electrode 4000 by the printing process, or may be distributed after the printing process and before performing the plating process. Of course, if the printing process is not performed, the plating process may be performed after distributing the surface-modified member. At this time, at least a portion of the surface modification member distributed on the surface may be melted.

Meanwhile, at least a part of the surface modification member may be evenly distributed on the surface of the stacked body 1000 with the same size, and at least part may be irregularly distributed with different sizes. In addition, a concave portion may be formed on at least a portion of the surface of the laminate 1000. That is, the surface modification member may be formed to form a convex portion and at least a portion of the region in which the surface modification member is not formed may be recessed to form a concave portion. In this case, at least a portion of the surface modification member may be formed deeper than the surface of the stacked body 1000. That is, the surface modification member may have a predetermined thickness embedded in a predetermined depth of the stacked body 1000 and the remaining thickness may be formed higher than the surface of the stacked body 1000. In this case, the thickness embedded in the laminate 1000 may be 1/20 to 1 of the average diameter of the oxide particles. That is, the oxide particles may all be incorporated into the laminate 1000, and at least some of the oxide particles may be contained. Of course, the oxide particles may be formed only on the surface of the laminate 1000. Accordingly, the oxide particles may be formed in a hemispherical shape or in a spherical shape on the surface of the laminate 1000. In addition, the surface modification member may be partially distributed on the surface of the laminate 1000 as described above, or may be distributed in the form of a film in at least one region. That is, the oxide particles may be distributed in the form of islands on the surface of the laminate 1000 to form a surface modification member. That is, oxides in a crystalline state or an amorphous state may be separated from each other and distributed in the form of an island on the surface of the stacked body 1000, and thus at least a part of the surface of the stacked body 1000 may be exposed. In addition, at least two of the surface modification members of the oxide may be connected to form a film in at least one region, and may be formed in an island shape at least in part. That is, at least two or more oxide particles may be aggregated or adjacent oxide particles may be connected to form a film. However, even when the oxide exists in the form of particles, or when two or more particles are agglomerated or connected, at least a part of the surface of the layered product 1000 is exposed to the outside by the surface modification member.

In this case, the total area of the surface modification member may be, for example, 5% to 90% of the total surface area of the laminate 1000. Plating spreading on the surface of the laminate 1000 may be controlled according to the area of the surface modification member, but if too many surface modification members are formed, it is difficult to contact the conductive pattern inside the laminate 1000 and the external electrode 400. I can. That is, when the surface modification member is formed in less than 5% of the surface area of the stacked body 1000, it is difficult to control the spreading phenomenon, and when formed in excess of 90%, the conductive pattern inside the stacked body 1000 and the external electrode 400 ) May not be in contact. Accordingly, it is preferable that the surface modification member is formed in an area that is capable of controlling plating spreading and contacting the conductive pattern inside the laminate 1000 and the external electrode 400. To this end, the surface modification member may be formed in an area of 10% to 90% of the surface area of the laminate 1000, preferably 30% to 70%, more preferably 40% to 50% It can be formed in an area. In this case, the surface area of the stacked body 1000 may be a surface area of one surface or a surface area of six surfaces of the stacked body 1000 forming a hexahedron. Meanwhile, the surface modification member may be formed to a thickness of 10% or less of the thickness of the laminate 1000. That is, the surface modification member may be formed to a thickness of 0.01% to 10% of the thickness of the laminate 1000. For example, the surface modifying member may be present in a size of 0.1 μm to 50 μm, and accordingly, the surface modifying member may be formed to a thickness of 0.1 μm to 50 μm from the surface of the laminate 1000. That is, the surface modification member may be formed to have a thickness of 0.1 μm to 50 μm from the surface of the layered body 1000 except for a region embedded in the layered body 1000. Accordingly, if the thickness of the laminate 1000 is embedded in the inner side, the surface BN modified member may have a thickness greater than 0.1 μm to 50 μm. When the surface-modified member is formed to a thickness of less than 0.01% of the thickness of the laminate 1000, it is difficult to control the spreading phenomenon, and when the surface-modifying member is formed to a thickness exceeding 10% of the thickness of the laminate 1000, the laminate 1000 The internal conductive pattern and the external electrode 400 may not be in contact. That is, the surface-modified member may have various thicknesses depending on the material properties (conductivity, semiconductivity, insulation, magnetic material, etc.) of the laminate 1000, and may have various thicknesses depending on the size, distribution amount, and aggregation of the oxide powder. have.

As a surface modification member is formed on the surface of the stacked body 1000 in this way, at least two regions having different components may exist on the surface of the stacked body 1000. That is, different components may be detected in the region where the surface modification member is formed and the region where the surface modification member is not formed. For example, in a region in which the surface modification member is formed, a component according to the surface modification member, that is, an oxide, may exist, and in an area that is not formed, a component according to the laminate 1000, that is, a component of a sheet. In this way, by distributing the surface modification member on the surface of the laminate 1000 before the plating process, the surface of the laminate 1000 may be modified by giving roughness. Therefore, the plating process can be uniformly performed, and accordingly, the shape of the external electrode 4000 can be controlled. That is, the surface of the laminate 1000 may have a resistance of at least one region different from that of another region. If the plating process is performed in a state in which the resistance is non-uniform, the growth of the plated layer is uneven. To solve this problem, the surface of the laminate 1000 can be modified by dispersing an oxide in a particle state or a molten state on the surface of the laminate 1000 to form a surface modification member, and the growth of the plating layer can be controlled. have.

Here, the oxide in a particle state or a molten state for uniformizing the surface resistance of the laminate 1000 is, for example, Bi ₂ O ₃ , BO ₂ , B ₂ O ₃ , ZnO, Co ₃ O ₄ , SiO ₂ , Al ₂ O ₃ , MnO, H ₂ BO ₃ , Ca(CO ₃ ) ₂ , Ca(NO ₃ ) ₂ , At least one of CaCO ₃ may be used. Meanwhile, the surface modification member may also be formed on at least one sheet in the laminate 1000. That is, the conductive patterns of various shapes on the sheet may be formed by a plating process, and the shape of the conductive pattern can be controlled by forming a surface modification member.

6 is an enlarged view of a part of the overvoltage protection part according to the first modified example of the first embodiment, and FIG. 7 is an enlarged view of a part of the overvoltage protection part according to the second modified example of the first embodiment.

In the above-described first embodiment, when the thickness of the void decreases toward the edge, the thickness decrease slope is not constant and is formed to be variable.

However, the present invention is not limited thereto, and as shown in FIG. 6, when the thickness of the void 320 decreases toward the edge, the thickness decrease slope may be constant. Thus, the inner surface of the eighth sheet 108 surrounding the void 320 may be a flat surface having no curvature. In addition, a region of the void 320 corresponding to the discharge region 321 does not have a change in thickness or is the same, and the outer region of the discharge region 321 has a constant thickness toward a direction away from the discharge region 321. It may be a decreasing shape. Accordingly, the inner surface of the sheet corresponding to the outer region of the discharge region 321 may be a flat surface without curvature.

And, in the above-described first modified example, as the thickness of the void 320 decreases toward the edge, the thickness decrease slope is continuously variable.

However, the present invention is not limited thereto, and the thickness decreases from the outer side of the discharge area 321 to a direction away from the discharge area 321 as in the second modification example shown in FIG. From, the thickness may be reduced to a second slope smaller than the first slope. In this case, the thickness in the region having the second slope is smaller than the thickness in the region having the first slope.

8 to 11 are enlarged views of a part of the overvoltage protection unit according to the third to sixth modifications of the first embodiment.

In describing the voids 320 according to the third to sixth modifications, for convenience of description, the three regions 320a, 320b, and 320c will be divided into three regions based on the thickness direction. That is, the void 320 is a first space 320a, which is an area where the distal end of the first discharge electrode 311 is exposed, an area spaced above the first space 320a, and the second discharge electrode 312 is It includes a second space 320c that is an area where the distal end is exposed, and an intermediate space 320b that is an area between the first space 320a and the second space 320c.

Here, the length and width of the first and second spaces 320a and 320c are the same, and the length and width of the intermediate space 320b are smaller than that of the first and second spaces 320a and 320c. In addition, the intermediate space 320b may be positioned to connect the center of the first space 320a and the center of the second space 320c. Accordingly, the shape of the void according to the third embodiment may be a shape in which the letter'H' is rotated by 90° as shown in FIGS. 8 to 11.

Each of the first and second spaces 320a and 320c and the intermediate space 320b is provided to be larger than the area of the discharge region 321. Accordingly, centering on the thickness direction of the discharge region 321, a lower portion of the discharge region 321 is accommodated in the first space 320a, an upper portion thereof in the second space 320c, and the rest are accommodated in the intermediate space 320b. In addition, the discharge region 321 is provided to be located at the center of the first and second spaces 320a and 320c. In other words, the discharge region 321 is provided to be located at the center of the first space 320a, the intermediate space 320b, and the second space 320c of the void 320.

Each of the first and second spaces 310a and 310c is provided so as to decrease in thickness as the edge region thereof moves away from the discharge region.

At this time, the surface facing the first discharge electrode 311 of the first space 320a is referred to as one surface, and the surface facing the one surface is referred to as the back surface, and the second discharge electrode 312 is referred to in the second space 320c. If one surface is referred to as one surface and the surface facing the one surface is referred to as a back surface, an edge of any one of the one surface and the back surface may be formed as an inclined surface.

For example, as in the third modified example illustrated in FIG. 8, the edge region of the first space 320a may be provided to have a downward slope in which the rear surface becomes closer to one surface toward the discharge region 321. 2 The edge region of the space 320c may be provided to have an upward slope in which the rear surface becomes closer to one surface as it goes away from the discharge region 321. Accordingly, the thickness of the edge regions of the first and second spaces 320a and 320c gradually decreases toward a direction away from the discharge region 321.

Here, the length (length in the X direction) (L _S ) and the width (length in the Y direction) (W _S ) of each of the first and second spaces 320a and 320c and the intermediate space 320b are the length of the composite element (L _C ) and width (W _C ) may be provided to be 5% to 80%, respectively. Preferably, the length of the void 320 (length in the X direction) (L _S ) is 10% to 60% of the length of the composite element (L _C ), and the width of the void 320 (length in the Y direction) (W _S ) It may be provided to be 10% to 70% of the width (W _C ) of this composite device.

In addition, at least, the length A _S from the center of the discharge region 321 to the ends of each of the first and second spaces 320a and 320b is 5% to 80% of the half length (LC/ ₂ ) of the composite element , It is preferably provided in 10% to 60%. In addition, the length from the center of the discharge region 321 to the ends of each of the first and second spaces 320a and 320b, that is, the width B _S is from 5% of the half width (W _C /2) of the composite element It is preferable to provide 80%, preferably 10% to 70%.

As another example, as in the fourth modified example of the first embodiment shown in FIG. 9, the edge region of the first space 320a is provided to have a downward inclination that the rear surface becomes closer to one surface in a direction away from the discharge region 321 The edge region of the second space 320c may be provided so as to have a downward slope in which one surface becomes closer to the rear surface toward the discharging region 321. Accordingly, the thickness of the edge regions of the first and second spaces 320a and 320c gradually decreases toward a direction away from the discharge region 321.

As another example, as in the fifth modified example of the first embodiment shown in FIG. 10, the edge region of the first space 320a has an upward slope in which one surface becomes closer to the rear surface in a direction away from the discharge region 321. The edge region of the second space 320c may be provided to have a downward slope in which one surface becomes closer to the rear surface toward the discharging region 321. Accordingly, the thickness of the edge regions of the first and second spaces 320a and 320c gradually decreases toward a direction away from the discharge region 321.

In addition, as in the sixth modified example of the first embodiment shown in FIG. 11, each of the first and second spaces 320a and 320c may be formed so that both one and the rear surfaces thereof are inclined.

When explaining in detail a shape in which both one side and the back side of the edge of the first space 320a are inclined, one side of the edge of the first space 320a is inclined upward so that it becomes closer to the rear surface in a direction away from the discharge region 321 , The rear surface may be inclined downward so as to be closer to the one surface toward the direction away from the discharge region 321. In addition, when a detailed description of a shape in which both one side and the back side of the edge of the second space 320c are inclined, one side of the edge of the second space 320c goes downward so that it becomes closer to the back side in a direction away from the discharge region 321 It is inclined, and the rear surface may be inclined upward so that the rear surface is closer to the one surface as it goes in a direction away from the discharge region 321.

As described above, when at least one of the one surface and the rear surface is inclined in the edge regions of each of the first and second spaces 320a and 320c, the thickness reduction slope may be variable as shown in FIGS. 8 to 11. . Accordingly, at least one of the first and second spaces 320a and 320c may have a curved surface.

Of course, the present invention is not limited thereto, and the thickness reduction slope of the edge region may be constant.

In addition, in the third to sixth modified examples illustrated in FIGS. 8 to 11, the thickness of the edge regions of the first and second spaces 320a and 320c decreases toward a direction away from the discharge region 321. .

However, the present invention is not limited thereto, and may have a shape in which the thickness decreases not only in the edge region but also in the remaining region. That is, the thickness may decrease from the center to the end of the first and second spaces 320a and 320c in a direction away from the discharge region 321.

12 is an enlarged view of a part of an overvoltage protection unit according to a seventh modified example of the first embodiment. 13 is an enlarged view of a part of the overvoltage protection unit according to the eighth modified example of the first embodiment.

In the above-described first embodiment and the first to sixth modifications of the first embodiment, the first and second discharge electrodes are formed to have different heights. However, the present invention is not limited thereto, and the first discharge electrode and the second discharge electrode may be provided on the same plane as in the seventh modified example illustrated in FIG. 12.

Hereinafter, a composite device according to a seventh modified example of the present invention will be described with reference to FIG. 12. In this case, content overlapping with the content described in the above-described embodiments will be omitted or briefly described.

Referring to FIG. 12, the composite device according to the seventh modified example of the present invention includes a laminate 1000 in which a plurality of sheets 100 (101 to 111) are stacked, and a plurality of internal electrodes provided in the laminate body 1000. A capacitor unit 2000 having (200; 201 to 206), an overvoltage protection unit 3000 having a discharge electrode 310; 311, 312 and a void 320 to protect against overvoltage such as ESD, and a laminate It includes external electrodes 4100, 4200 and 4000 formed on two side surfaces of 1000 and connected to the capacitor unit 2000 and the overvoltage protection unit 3000.

Here, the capacitor unit 2000 may have the same configuration and shape as the capacitor unit 2000 according to the first embodiment described above. That is, the capacitor unit 2000 may include first to sixth sheets 101 to 106 and first to sixth internal electrodes 201 to 206 formed on the first to sixth sheets 101 to 106, respectively. have.

In addition, a seventh sheet 107 may be stacked on the sixth sheet 106 and the sixth internal electrode 206, and the eighth sheet 108 may be stacked on the seventh sheet 107. In addition, an eleventh sheet 111 may be provided on the tenth sheet 110.

The overvoltage protection unit 3000 includes first and second discharge electrodes 311 and 312 spaced apart from each other while facing each other on the ninth sheet 109 formed on the eighth sheet 108 and the ninth sheet 109. And a void 320 provided through the second discharge electrodes 311 and 312 and the tenth sheet 110 formed on the ninth sheet 109, and the ninth and tenth sheets 109 and 110. have.

The first and second discharge electrodes 311 and 312 are arranged on the same plane in the longitudinal direction and formed to face each other. That is, the first and second discharge electrodes 311 and 312 are arranged on the ninth sheet 109 in the longitudinal direction and formed to face each other.

In addition, the void 320 may be provided through the ninth and tenth sheets 109 and 110 as described above, and the other ends of each of the first and second discharge electrodes 311 and 312 are the voids 320 ) Is formed to be located within. Here, a space between the other end of the first discharge electrode 311 and the other end of the second discharge electrode 312 is the discharge region 321.

At this time, the area of the void 320 is larger than that of the discharge area, and the discharge area 321 is accommodated in the void 320, and the discharge area 321 includes the ninth and tenth sheets 109 in which the voids 320 are formed. , 110) and are separated without contact. More specifically, heat blocking regions 322 are provided not only in the lateral direction based on the discharge region 321 but also on the upper and lower sides.

In the above-described seventh modified example, the discharge region 321 is positioned between the first and second discharge electrodes 311 and 312 formed to face each other and spaced apart on the ninth sheet 109, and the side of the discharge region 321 It has been described that the heat shield regions 322 are formed in the direction, upper and lower sides.

However, the present invention is not limited thereto, and the heat blocking region 322 may be formed on the side and above the discharge region 321 as in the eighth modified example illustrated in FIG. 13.

14 is an enlarged view of an overvoltage protection unit of a composite device according to a ninth modified example of the first embodiment of the present invention. 15 is an enlarged view of an overvoltage protection unit of a composite device according to a tenth modified example of the first embodiment of the present invention.

In the above-described embodiment, it has been described that the overvoltage protection unit includes one discharge region and one void. However, the present invention is not limited thereto, and the overvoltage protection units according to the ninth and tenth modifications illustrated in FIGS. 14 and 15 may be provided to include a plurality of discharge regions and a plurality of voids.

For example, as shown in FIG. 14, the overvoltage protection unit 3000 may be formed such that a plurality of pores 320 are stacked up and down, and a discharge region 321 is provided in each of the pores 320. That is, the overvoltage protection unit 3000 includes the first to third discharge electrodes 311, 312, 313, sheets 108 and 109 provided therebetween, the first discharge electrode 311 and the second discharge electrode 312. It includes a void 320 provided therebetween, and a void 320 provided between the second discharge electrode 312 and the third discharge electrode 313.

Here, the distal end of the first discharge electrode 311 and the distal end of the second discharge electrode 312 are provided so as to face each other, a discharge region 321 is provided therebetween, and the distal end of the second discharge electrode 312 3 The distal ends of the discharge electrodes 313 are provided to face each other, and a discharge region 321 is provided between them. Accordingly, a plurality of voids 320 are stacked and formed, and an overvoltage protection part 3000 in which a discharge region is provided in each of the voids 320 is provided.

As another example, as shown in FIG. 15, the overvoltage protection unit 3000 is formed such that a plurality of voids 320 are arranged in a longitudinal direction (X direction) of the stacked body, and a discharge region is provided in each void 320 Can be.

That is, the overvoltage protection unit 3000 is arranged in a horizontal direction on the seventh sheet 107 and spaced apart from the first and second discharge electrodes 312, the first and second discharge electrodes 312 and the seventh sheet 107. ) Formed on the eighth sheet 108 and a plurality of third and fourth discharge electrodes 313 and 314 arranged horizontally and spaced apart on the eighth sheet 108.

Here, the second discharge electrode 312 has one end connected to the second external electrode 4200 and the other end spaced apart from the first external electrode 4100, and the first discharge electrode 311 is a first external electrode 4100. ) And the second discharge electrode 312, and one end and the other end are spaced apart without being connected to them. In addition, the third discharge electrode 313 has one end connected to the first external electrode 4100 and the other end spaced apart from the second external electrode 4200, and the fourth discharge electrode 314 is a third discharge electrode 203. ) And the second external electrode 4200, and one end and the other end are formed to be spaced apart from them.

In addition, in the first discharge electrode 311, an end portion including one end overlaps with an end portion including the other end of the third discharge electrode 313, and the end portion including the other end of the first discharge electrode 311 is a fourth It overlaps with an end portion including one end of the discharge electrode 314. In addition, in the second discharge electrode 312, the end portion including the other end overlaps the end portion including the other end of the fourth discharge electrode 314.

Accordingly, a discharge region 321 is provided between the distal end of the first discharge electrode 311 and the distal ends of the third and fourth discharge electrodes 313 and 314, and the distal end of the second discharge electrode 312 and the fourth discharge electrode (314) A discharge region 321 is provided between the distal ends. That is, a total of three discharge regions are provided.

In addition, the void 321 is provided in a form accommodated in the three discharge regions 321 described above. That is, the area of the void 320 is larger than that of the discharge region 321.

16 is a cross-sectional view showing a composite device according to an eleventh modified example of the first embodiment of the present invention.

In the composite device according to the above-described first embodiment and the first to tenth modifications, the capacitor unit 2000 and the overvoltage protection unit 3000 are manufactured together and are bonded or coupled to each other.

However, the present invention is not limited thereto, and the capacitor unit 2000 and the overvoltage protection unit 3000 are separately manufactured, and the capacitor unit 2000 and the overvoltage protection unit 3000 are separately manufactured, and they are mutually bonded or coupled to each other using a separate coupling unit 5000. You can also make it.

Here, the coupling part 5000 may be made of the same material as or different from at least one of the capacitor part 2000 and the overvoltage protection part 3000. When the coupling part 5000 is made of a material different from that of the capacitor part 2000 and the overvoltage protection part 3000, the coupling part 5000 may be made of, for example, a glass paste, a polymer paste, an oligomer paste, or the like. That is, it may be made of a paste containing glass, a paste containing a polymer, and a paste containing an oligomer. The glass paste may include at least one of SiO ₂ , BiO ₂ , B ₂ O ₃ , BaO, and Al ₂ O ₃ , and the polymer paste may include Si resin and synthetic resin. In addition, the oligomer paste may contain an epoxy resin, and the epoxy resin includes a novolac-based, bisphenol-based, amine-based, cycloalipatic-based, and bromine-based epoxy resin. can do.

17 is a cross-sectional view showing a composite device according to a twelfth modified example of the first embodiment of the present invention.

In the above-described embodiments and modifications, it has been described that one capacitor unit 2000 and one overvoltage protection unit 3000 are stacked in the vertical direction. However, the present invention is not limited thereto, and capacitor units 2000a and 2000b may be provided on the upper and lower sides with the overvoltage protection unit 3000 interposed therebetween, as in the twelfth modified example illustrated in FIG. 17.

Here, the first capacitor portion 2000a includes first to sixth sheets 101 to 106 and first to sixth internal electrodes 201 to 206 formed on the first to sixth sheets 101 to 106, respectively. And, the second capacitor unit 200b includes the 9th to 14th sheets 109 to 114 and the 7th to 12th internal electrodes 207 to 212 respectively formed on the 9th to 14th sheets 109 to 114 can do.

The above-described first and modified examples are not limited to the examples described above, and may be variously combined with each other.

The composite device as described above may be provided between the metal case 10 of the electronic device and the internal circuit 20 as shown in FIG. 18. That is, one of the external electrodes 4000 may be connected to the internal circuit 20 and the other may be connected to the metal case 10 of the electronic device. For example, the first external electrode 4100 may be connected to the internal circuit 20 and the second external electrode 4200 may be connected to the metal case 10. In this case, a ground terminal may be provided in the internal circuit 20, and a ground terminal may be provided in a region other than the internal circuit 20. For example, a ground terminal may be provided between the metal case 10 and the internal circuit 20. Accordingly, the composite element may be connected to the ground terminal through the internal circuit 20 and may be connected in parallel between the internal circuit 20 and the ground terminal. Meanwhile, at least one passive element, such as a diode, may be provided between the composite element and the internal circuit 20.

In addition, as shown in FIG. 19, a contact portion 30 using a conductive member such as a contactor or a conductive gasket may be further provided between the second external electrode 4200 and the metal case 10. Therefore, it is possible to cut off the electric shock voltage transmitted from the inside of the electronic device, for example, the internal circuit 20 or the ground terminal to the metal case 10, and the overvoltage such as ESD applied from the outside to the internal circuit 20 is ground terminal. Can be passed through. That is, in the composite device of the present invention, current does not flow between the external electrodes 4000 at the rated voltage and the electric shock voltage, and at the ESD voltage, current flows through the gap 320 and the overvoltage passes to the ground terminal. In addition, a communication signal from the outside, that is, an AC frequency may be transmitted to the internal circuit 20 by a capacitor formed between the internal electrodes 200. Accordingly, even when a separate antenna is not provided and the metal case 10 is used as an antenna, a communication signal can be received from the outside. Consequently, the composite device according to the present invention may block an electric shock voltage, pass an ESD voltage to a ground terminal, and apply a communication signal to an internal circuit.

In addition, in the embodiments of the present invention, in providing the discharge regions 321 between the discharge electrodes 310, the discharge regions 321 are formed to be spaced apart without contacting the sheet. That is, the air gap 320 is provided to have a larger area than the discharge region 321, and the overvoltage protection unit 3000 is provided so that the discharge region 321 is accommodated in the air gap 320. Accordingly, the discharge region 321 is not in contact with the stacked body 1000 around the discharge region 321, and a heat blocking region 322, which is a predetermined space, is provided around the discharge region 321. Therefore, when an overvoltage such as ESD is bypassed to the discharge region 321, the heat generated in the discharge region 321 passes through the heat blocking region 322, thereby preventing or preventing heat from being transferred to the sheet. I can. Accordingly, it is possible to suppress or prevent the occurrence of leakage current due to grain growth in the sheet due to heat generated from the discharge region 321, and thus, deterioration of the quality of the overvoltage protection unit may be suppressed or prevented.

The present invention has been described as an example of a complex device that is provided in an electronic device of a smart phone and protects the electronic device from overvoltage such as ESD applied from the outside, and blocks leakage current from the inside of the electronic device to protect the user. However, the composite device of the present invention may be provided in various electric and electronic devices other than a smart phone to perform at least two protection functions.

Meanwhile, between the metal case 10 and the composite element, as shown in FIG. 19, a contact portion 30 may be provided in electrical contact with the metal case 10 and having an elastic force. That is, the contact portion 30 and the composite device according to the present invention may be provided between the metal case 10 and the internal circuit 20 of the electronic device. When an external force is applied from the outside of the electronic device, the contact unit 30 has elastic force so as to mitigate the impact, and may be made of a material including a conductive material. The contact part 30 may be, for example, a clip shape as shown in FIG. 20, and may be a conductive gasket as shown in FIG. 21. In addition, at least one area of the contact unit 30 may be mounted on the internal circuit 20, for example, a PCB. The composite device including the contact unit 30 will be described with reference to FIGS. 20 and 21 as follows.

A composite element is provided between the metal case 10 and the internal circuit 20, and a clip-shaped contact portion 5100 on the second external electrode 4200 of the composite element as shown in FIGS. 20 and 21, respectively. Alternatively, a contact portion 5200 using a conductive material layer may be provided. When an external force is applied from the outside of the electronic device, the contact portions 5100 and 5200 have an elastic force so as to mitigate the impact, and are made of a material including a conductive material. Meanwhile, the first external electrode 4100 of the composite device may be provided in contact with the internal circuit 20, and a metal layer such as stainless steel may be further provided between the internal circuit 20 and the first external electrode 4100. I can.

As shown in FIG. 20, the contact portion 5100 may have a clip shape. The clip-shaped contact part 5100 is provided on the support part 5110 provided on the composite element, and is provided on the upper side of the support part 5110 and is positioned opposite to a conductor such as a metal case, and at least a part of the contact part ( The 5120 may include a connection part 5130 provided between the support part 5110 and one side of the contact part 5120 to connect them and have an elastic force. Here, the connection part 5130 is formed to connect one end of the support part 5110 and one end of the contact part 5120, and may be formed to have a curvature. That is, when the connection part 5130 is pressed by an external force, it is pressed in the direction in which the circuit board 20 is positioned, and when the external force is released, it has an elastic force that is restored to its original state. Accordingly, the contact portion 5100 may be formed of a metallic material in which at least the connection portion 5130 has elasticity.

In addition, the contact portion of the present invention may include a conductive rubber, a conductive silicone, an elastic body having a conductive wire inserted therein, and a gasket having a surface coated or bonded with a conductor in addition to a clip having conductivity and elasticity. That is, as illustrated in FIG. 21, the contact portion 5200 may include a conductive material layer. For example, in the case of a conductive gasket, the inside may be made of a non-conductive elastic body and the outside may be coated with a conductive material. Although not shown, the conductive gasket may include an insulating elastic core having a through hole formed therein, and a conductive layer formed to surround the insulating elastic core. The insulating elastic core has a tube shape with a through hole formed therein, and may have a substantially rectangular or circular cross section, but is not limited thereto and may be formed in various shapes. For example, the insulating elastic core may not have a through hole formed therein. The insulating elastic core may be formed of silicone or elastic rubber. The conductive layer may be formed to surround the insulating elastic core. This conductive layer may be formed of at least one metal layer, for example, gold, silver, copper, or the like. On the other hand, a conductive layer may not be formed and conductive powder may be mixed with the elastic core.

It has been described that the composite device according to the above-described first embodiment and the first to eleventh modifications of the first embodiment includes a capacitor unit and an overvoltage protection unit. That is, it includes an overvoltage protection unit and a functional unit that functions differently from the overvoltage protection unit, and it has been described that the capacitor unit is applied as the function unit.

However, the present invention is not limited thereto, and the composite element may be configured such that a noise filter is applied as a functional unit that functions differently from the overvoltage protection unit. That is, the composite device may be provided to include an overvoltage protection unit and a noise filter.

22 is a three-dimensional view as viewed from the outside of a composite device according to a second embodiment of the present invention. 23 is an exploded perspective view of a composite device according to a second embodiment of the present invention. 24 is a cross-sectional view of a composite device according to a second embodiment of the present invention, taken along line A-A' of FIG. 22.

Hereinafter, a composite device according to a second embodiment of the present invention will be described with reference to FIGS. 22 to 24. In this case, the description overlapping with the above-described first embodiment will be omitted or briefly described.

22 to 24, the composite device according to the second embodiment of the present invention includes a stack 1000 in which a plurality of sheets 121 to 127; 100 are stacked, and a noise filter unit provided in the stack 1000 6000 and an overvoltage protection unit 3000, and external electrodes 4100 to 4600; 4000 provided outside the stacked body 1000.

One. Laminate

The laminate may be similar or identical to the laminate of the composite device according to the first embodiment described above. Specifically, the stacked body 1000 may be formed by stacking a plurality of sheets 121 to 127; 100. In addition, the stacked body 1000 may further include a cover layer (not shown) provided on at least one of the lower and upper portions. That is, the stacked body 1000 may include a cover layer provided on the lowermost layer and the uppermost layer, respectively. In this case, only one cover layer may be provided on the top or bottom, or may be provided on both the top and bottom. Of course, a separate cover layer is not provided, and the lowermost sheet, that is, the first sheet 121 may function as the lower cover layer, and the uppermost sheet, that is, the seventh sheet 127 may function as the upper cover layer.

The stacked body 1000 may be provided in a substantially hexahedral shape. That is, the stacked body 1000 has a predetermined length and width, respectively, in one direction (for example, the X direction) and the other direction (for example, the Y direction) perpendicular to each other in the horizontal direction, and the vertical direction (eg, Z Direction) may be provided in a substantially hexahedral shape having a predetermined height. A plurality of external electrodes 4100 to 4600 are formed on the outer surface of the stacked body 1000. For example, in the hexahedral multilayer body 1000, first and second external electrodes 4100 and 4200 are formed on both outer surfaces (first and second surfaces) in the X direction. Accordingly, the first external electrode 4100 and the second external electrode 4200 are formed to face each other. In addition, third and fourth external electrodes 4300 and 4400 are formed on one (third surface) of both outer surfaces of the stacked body 1000 in the Y direction. In addition, the third external electrode 4300 and the fourth external electrode 4400 are arranged in an array direction of the first and second external electrodes 4100 and 4200, that is, in the X direction, and are separated from each other. In addition, fifth and sixth external electrodes 4500 and 4600 are formed on the other surface (the fourth surface) of both outer surfaces in the Y direction of the stacked body 1000. In addition, the fifth external electrode 4500 and the sixth external electrode 4600 are arranged in an array direction of the first and second external electrodes 4100 and 4200, that is, in the X direction, and are spaced apart. In addition, the fifth external electrode 4500 may be formed to face the third external electrode 4300, and the sixth external electrode 4600 may be formed to face the fourth external electrode 4400.

The sheet on which the noise filter unit 6000 is implemented, that is, the first to fourth sheets 121 to 124 may be nonmagnetic sheets, and the sheets on which the overvoltage protection unit 3000 is implemented, that is, the fifth to seventh sheets Reference numerals 125 to 127 may be a dielectric sheet.

2. Noise filter part

As shown in FIGS. 23 and 24, the noise filter unit 6000 may include a plurality of sheets, for example, first to fourth sheets 121 to 124 being stacked. The plurality of sheets 121 to 124 may include lead electrodes, The coil pattern and the hole in which the conductive material is embedded may be selectively formed.

That is, the noise filter unit 6000 is selectively formed in the first to fourth sheets 121 to 124 and the first to fourth sheets 121 to 124, and a plurality of holes h1 and h2 in which a conductive material is embedded. h3, h4), coil patterns 610, 620, 630, and 640 formed on the first to fourth sheets 121 to 124, and the coil patterns 610 formed on the first to fourth sheets 121 to 124, and , 620, 630, and 640 may include lead electrodes 611, 612, 613, and 613 connected to the outside and drawn out.

The plurality of holes h1, h2, h3, and h4 in which the conductive material is buried form vertical connection wiring. That is, the first hole h1 provided on the second sheet 122 and the second hole h2 formed on the third sheet 123 form vertical connection wiring, and are provided on the third sheet 123. The third hole h3 and the fourth hole h4 provided on the fourth sheet 124 form vertical connection wiring.

The configuration of the noise filter unit 6000 will be described in more detail as follows.

The first sheet 121 may be provided in a plate shape having a predetermined thickness. For example, the first sheet 121 may be provided in a substantially rectangular plate shape, and more specifically may have a rectangular or square shape. A first coil pattern 610 and a first lead electrode 611 are formed on the first sheet 121. The first coil pattern 610 may have a predetermined width and spacing, and may be formed in a spiral shape that rotates outward in a counterclockwise direction. In this case, the first coil pattern 610 may be formed so as not to pass through the central region of the first sheet 121. In addition, the first coil pattern 610 may be formed with 3 to 8 turns. The end of the first coil pattern 610 is connected to the first lead electrode 611. The first lead electrode 611 is formed to have a predetermined width and is one side of the first sheet 121, for example, a side on which the third and fourth external electrodes 4300 and 4400 are formed, and the first lead electrode 611 is It is formed to be exposed to the side constituting the three sides (hereinafter, the third side). To this end, the first lead electrode 611 is formed to extend from the first coil pattern 610 in the direction of the third side of the first sheet 121. In addition, the first lead electrode 611 is spaced apart from the second lead electrode 621 formed on the second sheet 122 by a predetermined distance in the X direction, and the third lead electrode 631 formed on the third sheet 123 It is formed to form a straight line in the Y direction. In addition, the first lead electrode 611 is connected to the third external electrode 4300 formed on the third surface of the stacked body 1000. In addition, the first lead electrode 611 may be formed to have a width wider than that of the first coil pattern 610. Accordingly, an increase in resistance may be prevented by increasing a contact area with the third external electrode 4300.

The second sheet 122 may be provided in the same shape and size as or corresponding to the first sheet 121. That is, the second sheet 122 may be provided in a substantially rectangular plate shape having a predetermined thickness. A first hole h1, a second coil pattern 620, and a second lead electrode 621 are formed in the second sheet 122. The first hole h1 is formed to penetrate the second sheet 122 in the vertical direction, and may be formed in a predetermined region by being spaced apart from the center point of the second sheet 122 in one direction. The center point can be defined as a point where two diagonal lines meet when an imaginary line is drawn diagonally from four corners. For example, the second sheet 122 is provided in a rectangular shape, and the first hole h1 is at a center point of the second sheet 122, for example, the first external electrode 4100 and the second external electrode. It may be formed to be spaced apart by a predetermined interval in the arrangement direction of the 4200. In other words, the first hole h1 is defined in the alignment direction of the first side and the second side, which are sides constituting the first and second sides of the stacked body 1000 at the center point of the second sheet 122. It can be formed at intervals. In this case, the first hole h1 may be formed at the same position as the second hole h2 formed in the third sheet 123. A conductive material is buried in the first hole h1, for example, and may be buried using a metallic material paste, thereby being connected to the second hole h2 of the third sheet 123. Further, the second coil pattern 620 may be formed with a predetermined number of turns by rotating in one direction from a region spaced apart from the first hole h1 by a predetermined distance. That is, the second coil pattern 620 may be formed from a predetermined area spaced from the center point of the second sheet 122 in the other direction at the same distance as the distance of the first hole h1 from the center point of the second sheet 122. That is, the second coil pattern 620 may be formed from the same position as the third hole h3 formed in the third sheet 123. In addition, the second coil pattern 620 may be formed so as not to pass through the center region of the second sheet 122 and the first hole h1, and may be formed by rotating in the same direction as the first coil pattern 610. have. For example, the second coil pattern 620 may have a predetermined width and interval, and may be formed in a spiral shape that rotates outward in a counterclockwise direction. In addition, an end of the second coil pattern 620 is connected to the second lead electrode 621. The second lead electrode 621 is formed to have a predetermined width and is one side of the second sheet 122, for example, a side on which the third and fourth external electrodes 4300 and 4400 are formed, and the second lead electrode 621 is It is formed to be exposed to the third side constituting the three sides. To this end, the second lead electrode 621 is formed extending from the second coil pattern 620 in the direction of the third side of the second sheet 122. In addition, the second lead electrode 621 is spaced apart from the first lead electrode 611 formed on the first sheet 121 by a predetermined distance in the X direction, and the fourth lead electrode 641 formed on the fourth sheet 124 It is formed to be exposed to the opposite side. In addition, the second lead electrode 621 is formed to form a straight line with the fourth lead electrode 641 in the Y direction. The second lead electrode 621 is connected to the fourth external electrode 4400. In this case, the second lead electrode 621 may be formed to have a width wider than that of the second coil pattern 620. Accordingly, an increase in resistance may be prevented by increasing a contact area with the fourth external electrode 4400.

Two holes, that is, second and third holes h2 and h3, a third coil pattern 630, and a third lead electrode 631 are formed in the third sheet 123. Each of the second hole h2 and the third hole h3 is formed by penetrating the third sheet 123 in the vertical direction. In addition, the second hole h2 is formed at the same position as the first hole h1, and the third hole h3 is formed at the same position as the fourth hole h4 formed in the fourth sheet 124. I can. The second and third holes h2 and h3 are filled with a conductive material, and may be filled with a metallic material paste. Accordingly, the second hole h2 is connected to the first hole h1 by a conductive material, and the third hole h3 is connected to the fourth hole h4 provided in the fourth sheet 124 by a conductive material. do. The third coil pattern 630 may have a predetermined width and spacing, and may be formed with a predetermined number of turns by rotating in one direction from the second hole h2. For example, the third coil pattern 630 rotates in a direction opposite to the first and second coil patterns 610 and 620, in the same direction as the fourth coil pattern 640 formed on the fourth sheet 124, that is, clockwise. Can be formed by In this case, the third coil pattern 630 may be formed so as not to pass through the central region and the third hole h3 of the third sheet 123. In addition, an end of the third coil pattern 630 is connected to the third lead electrode 631. The third lead electrode 631 is the other side of the third sheet 123, for example, the side on which the fifth and sixth external electrodes 4500 and 4600 are formed, and the side constituting the fourth side of the stacked body 1000 It is formed to be exposed (hereinafter, the fourth side). To this end, the third lead electrode 631 is formed extending from the third coil pattern 630 in the direction of the fourth side of the third sheet 123. Accordingly, the third coil pattern 630 is formed to be exposed in the same direction as the fourth lead electrode 641 formed on the fourth sheet 124. At this time, the third lead electrode 631 is spaced apart from the fourth lead electrode 641 by a predetermined distance in the X direction, and is formed to form a straight line with the first lead electrode 611 formed on the first sheet 121 in the Y direction. . The third withdrawal electrode 631 may be connected to the fifth external electrode 4500. In this case, the third lead electrode 631 may be formed to have a width wider than that of the third coil pattern 630. Accordingly, an increase in resistance may be prevented by increasing a contact area with the fifth external electrode 4500.

The fourth sheet 124 is formed with a fourth hole h4 filled with a conductive material, a fourth coil pattern 640, and a fourth lead electrode 641. The fourth sheet 124 may be provided in a substantially rectangular plate shape having a predetermined thickness. The fourth hole h4 may be spaced apart from the center point of the fourth sheet 124 in one direction and formed in a predetermined area. For example, the fourth sheet 124 is provided in a rectangular shape, and the fourth hole h4 is the alignment direction of the first and second external electrodes 4100 and 4200 at the center point of the fourth sheet 124 It may be formed to be spaced apart at a predetermined interval along the line. A conductive material is buried in the fourth hole h4, and may be buried using a metal material paste. In addition, the fourth coil pattern 640 may rotate in one direction from the fourth hole h4 to be formed with a predetermined number of turns. For example, the fourth coil pattern 640 may be formed in a spiral that rotates in the same direction as the third coil pattern 630 and in a direction opposite to the first and second coil patterns 610 and 620, that is, in a clockwise direction. . In this case, the fourth coil pattern 640 may be formed so as not to pass through the central region of the fourth sheet 124. In addition, an end of the fourth coil pattern 640 is connected to the fourth lead electrode 641. The fourth lead electrode 641 is formed to have a predetermined width and is formed to be exposed to the fourth side of the fourth sheet 124. To this end, the fourth lead electrode 641 is formed extending from the fourth coil pattern 640 in the direction of the fourth side of the fourth sheet 124. Accordingly, the fourth drawing electrode 641 is the same as the third drawing electrode 631 and is formed to be exposed in the opposite direction to the first and second drawing electrodes 611 and 621. At this time, the fourth withdrawal electrode 641 is spaced apart from the third withdrawal electrode 631 by a predetermined distance in the X direction, and is formed to form a straight line with the second withdrawal electrode 621 in the Y direction. In addition, the fourth lead electrode 641 is connected to the sixth external electrode 4600. In addition, the fourth lead electrode 641 may be formed to have a width wider than that of the fourth coil pattern 640. Accordingly, an increase in resistance may be prevented by increasing a contact area with the sixth external electrode 4600.

According to the noise filter unit 6000, as described above, the first hole h1 provided on the second sheet 122 and the second hole h2 formed on the third sheet 123 connect vertical connection wiring. And the third hole h3 provided on the third sheet 123 and the fourth hole h4 provided on the fourth sheet 124 form vertical connection wiring. In other words, the first coil pattern 610 and the third coil pattern 630 are connected to each other, and the second coil pattern 620 and the fourth coil pattern 640 are connected to each other. Accordingly, the first coil pattern 610 and the third coil pattern 630 connected thereto constitute the first inductor, and the second coil pattern 620 and the fourth coil pattern 640 connected thereto constitute the second inductor. Is done. Accordingly, a common mode filter in which the first coil pattern and the third coil pattern are connected and the second coil pattern and the fourth coil pattern are connected is provided.

In the above, four coil patterns are formed and two are connected to each implement an inductor, but four or more coil patterns are formed, and three or more coil patterns are connected to implement an inductor. In addition, the inductances of the plurality of inductors may all be the same, or at least one inductance may be different. In order to make the inductance different, for example, the number of turns of the coil pattern can be different.

3. Overvoltage protection

The overvoltage protection unit 3000 may include at least two discharge electrodes 330a and 330b formed to be spaced apart in a vertical direction, and a void 340 between the two discharge electrodes 330a and 330b. For example, the overvoltage protection unit 3000 is formed on the fifth sheet 125 and the first discharge electrode 330a, the fifth sheet 125, and the first discharge electrode 330a. The sixth sheet 126, the plurality of voids 340a, 340b, 340c, 340d; 340 and the seventh sheet 127 through the sixth sheet 126 or provided on the sixth sheet 126 It includes a plurality of discharge electrodes 332, 333, 334, 335; 330b formed on the surface facing the sheet 126. Here, the discharge electrodes formed on the surface of the seventh sheet 127 facing the sixth sheet 126 may be provided in the same number as the lead electrodes 611, 621, 631 641 of the noise filter unit 6000. have.

Hereinafter, for convenience of description, the discharge electrode formed on the fifth sheet 125 is referred to as a first discharge electrode 330a. In addition, a plurality of discharge electrodes formed on a surface of the seventh sheet 127 facing the sixth sheet 126 are referred to as second to fifth discharge electrodes 332, 333, 334 and 335.

Reflecting this and describing again, the second to fifth discharge electrodes 332, 333, 334, and 335 and the first discharge electrode 330a are formed to have different heights. For example, the first discharge electrode 330a is located under the second to fifth discharge electrodes 332, 333, 334, and 335. In other words, the second to fifth discharge electrodes 332, 333, 334, and 335 are positioned above the first discharge electrode 330a.

The first discharge electrode 330a is formed on the fifth sheet 125, and both ends thereof are connected to the first and second external electrodes 4100 and 4200. That is, the first discharge electrode 330a is formed to extend in the X direction, one end is exposed to the first side of the fifth sheet 125, and the other end is formed to be exposed to the second side of the fifth sheet 125. . In addition, one end of the exposed first discharge electrode 330a is connected to the first external electrode 4100 and the other end is connected to the second external electrode 4200. In addition, the first discharge electrode 330a is formed to extend in a direction crossing the extending direction of each of the second to fifth discharge electrodes 332, 333, 334, and 335. In this case, the first discharge electrode 330a may be formed to overlap with a portion of the second to fifth discharge electrodes 332, 333, 334, and 335, for example, an end portion. That is, of the two ends of each of the second to fifth discharge electrodes 332, 333, 334, and 335, a distal end including an end not connected to an external electrode and the first discharge electrode 330a may be formed to overlap each other. .

The second to fifth discharge electrodes 332, 333, 334 and 335 are formed on the seventh sheet 127. More specifically, second to fifth discharge electrodes 332, 333, 334, and 335 are formed on a surface of the seventh sheet 127 that faces the sixth sheet 126, that is, a lower surface. The positions of the second to fifth discharge electrodes 332, 333, 334, and 335 may be described as being formed on the sixth sheet 126. Each of the second to fifth discharge electrodes 332, 333, 334, and 335 may extend in a direction crossing the first discharge electrode 330a. In other words, the third and fourth external electrodes 4300 and 4400 and the fifth and sixth external electrodes 4500 and 4600 may be formed extending in the alignment direction, that is, in the Y direction. More specifically, the second and third discharge electrodes 332 and 333 may be formed to extend in the direction of the fourth side from the third side, which is a side constituting the third side of the stacked body 1000. In addition, the second discharge electrode 332 and the third discharge electrode 333 are disposed at predetermined intervals in the arrangement direction of the first external electrode 4100 and the second external electrode 4200, that is, in the X direction. Here, the second discharge electrode 332 has one end exposed to the third side connected to the third external electrode 4300, and the third discharge electrode 333 has one end exposed to the third side connected to the fourth external electrode ( 4400). In addition, the other ends of each of the second and third discharge electrodes 332 and 333 are spaced apart from the fifth and sixth external electrodes 4500 and 4600. The fourth and fifth discharge electrodes 334 and 335 may be formed to extend in a direction of a third side from a fourth side, which is a side constituting the fourth side of the stacked body 1000. In addition, the fourth discharge electrode 334 and the fifth discharge electrode 335 are disposed at predetermined intervals in the arrangement direction of the first external electrode 4100 and the second external electrode 4200, that is, in the X direction. Here, the fourth discharge electrode 334 has one end exposed to the fourth side connected to the fifth external electrode 4500, and the fifth discharge electrode 335 has one end exposed to the fourth side being a sixth external electrode ( 4600). The other ends of each of the fourth and fifth discharge electrodes 334 and 335 are spaced apart from the third and fourth external electrodes 4300 and 4400.

Further, the second to fifth discharge electrodes 332, 333, 334, and 335 may be formed at the same position as the lead electrodes of the plurality of noise filter units 6000. That is, at least part of the second discharge electrode 332 overlaps with the first withdrawal electrode 611, and at least part of the third discharge electrode 333 overlaps with the second withdrawal electrode 621, and the fourth discharge electrode At least a portion of the 334 may overlap the third withdrawal electrode 631, and the fifth discharge electrode 335 may be formed so that at least a portion of the fifth discharge electrode 335 overlaps the fourth withdrawal electrode 641. Accordingly, the second discharge electrode 332 is connected to the third external electrode 4300, the third discharge electrode 333 is connected to the fourth external electrode 4400, and the fourth discharge electrode 334 is connected to the fifth. The external electrode 4500 is connected, and the fifth discharge electrode 335 is connected to the sixth external electrode.

The discharge electrodes 330a and 330b as described above may be formed of a conductive material, for example, formed of a metal or a metal alloy including any one or more of Ag, Au, Pt, Pd, Ni, Cu, Al. Can be. For the alloy, for example, an Ag and Pd alloy can be used. In this case, the discharge electrodes 330a and 330b may be formed of the same material as the coil patterns of the noise filter unit 6000. Further, the discharge electrodes 330a and 330b may be formed to be smaller, larger, or equal to the thickness of the coil pattern of the noise filter unit 6000.

The voids 340a, 340b, 340c, 340d; 340 are a sixth sheet positioned between the first discharge electrodes 330a and second to fifth discharge electrodes 332, 333, 334, 335 spaced apart in the vertical direction It can be provided at (126). At this time, the void 340 may be provided to be positioned between the distal ends of the second to fifth discharge electrodes 332, 333, 334, 335 and the first discharge electrode 330a. Further, the distal ends of each of the second to fifth discharge electrodes 332, 333, 334, and 335 are formed to be received or exposed in the void 340. In addition, regions of the first discharge electrodes 330a facing the second to fifth discharge electrodes 332, 333, 334, and 335 are formed to be accommodated or exposed inside the void 340.

In more detail, the number of voids 340 may be equal to the number of lead electrodes of the noise filter unit 6000, for example, four. Accordingly, overvoltages coming from each of the plurality of lead electrodes of the noise filter unit may be bypassed.

And among the first to fourth voids 340a, 340b, 340c, and 340d, the first void 340a is between the distal end of the second discharge electrode 332 and the first discharge electrode 330a, and the second void 340b Silver between the distal end of the third discharge electrode 333 and the first discharge electrode 330a, the third gap 340c is between the distal end of the fourth discharge electrode 334 and the first discharge electrode 330a, the fourth gap ( 340d is formed to be positioned between the distal end of the fifth discharge electrode 335 and the first discharge electrode 330a. In addition, a distal end of the second discharge electrode 332 and a region of the first discharge electrode 330a facing it are formed to be received or exposed in the first void 340a, and the distal end of the third discharge electrode 333 The region of the first discharge electrode 330a to be viewed is formed to be received or exposed to the second air gap 340b, and the end portion of the fourth discharge electrode 334 and the region of the first discharge electrode 330a facing the third air gap ( 340c), and a distal end of the fifth discharge electrode 335 and a region of the first discharge electrode 330a facing the end portion of the fifth discharge electrode 335 is formed to be received or exposed in the fourth void 340d.

Here, in each of the first to fourth voids 340a, 340b, 340c, and 340d, a region where the second to fifth discharge electrodes 332, 333, 334, 335 and the first discharge electrode 330a face each other is This is a path for bypassing an overvoltage such as ESD, that is, a discharge region 341.

In the provision of the void 340, it is formed to have a larger area than the discharge region 341, and the discharge region 341 is accommodated in the void 340. Accordingly, the void 340 is configured to include a discharge region 341 and an empty space located around the discharge region 341, and the empty space is a heat blocking region 342. Accordingly, the void 340 includes a discharge region 341 and a heat blocking region 342 surrounding the discharge region 341 or formed around the discharge region 341.

To this end, the length (length in the X direction) (L _S ) and the width (transition in the Y direction) (W _S ) of the void 340 are the length (length in the X direction) and the width (length in the Y direction) of the discharge region 341 ) Can be formed larger than. In addition, the distance in the horizontal direction of the void 340 may be longer than the separation distance between the second to fifth discharge electrodes 332, 333, 334, and 335 and the first discharge electrode 330a. That is, the length (X-direction length (L _s ) and width (Y-direction length) (W _s ) of the void 340 may be formed to be longer than the Z-direction length, that is, the thickness (Hs). And, the void 340. The length of the Z-direction, that is, the thickness Hs may be the same as a separation distance between the second to fifth discharge electrodes 332, 333, 334, and 335 and the first discharge electrode 330a. Here, the void 340 ) In the Z direction, that is, the thickness Hs, may mean the length of the thickest portion of the void 340, and may mean the height or thickness of the discharge region 341.

Among the voids 340, a lower portion of the discharge region 341 may be connected or contacted with the first discharge electrode 330a, and an upper portion may be connected or contacted with the second to fifth discharge electrodes 332, 333, 334, and 335. . More specifically, a lower portion of the discharge region 341 of each of the first to fourth voids 340a, 340b, 340c, and 340d may be connected to or in contact with the first discharge electrode 330a. In addition, an upper portion of the discharge region 341 of the first air gap 340a is a second discharge electrode 332, an upper portion of the discharge region 341 of the second air gap 340b is a third discharge electrode 333, and a third air gap ( The upper portion of the discharge region 341 of 340c) may be formed to be connected to or in contact with the upper portion of the fourth discharge electrode 334 and the upper portion of the discharge region 341 of the fourth void 340d may be formed to be in contact with the upper portion of the fifth discharge electrode 335 .

In addition, the outer side of the discharge area 341, that is, the heat blocking area 342 is formed to extend outward to the discharge area 341 so that the discharge area 341 does not directly contact the sixth sheet 126 and is spaced apart. Can be. To this end, a discharge region 341 is formed in the center of the void 340 and a heat blocking region 342 is formed at the edge. In addition, the discharge regions 341 may be formed to be spaced apart from each other without directly contacting the laminate 10000 or the sheet 100.

As described above, since the void 340 is formed through the sixth sheet 126, the void 340 is formed in an open upper and lower portion, and the lower portion of the void 340 is in the first discharge electrode 330a. Accordingly, the upper portion of the void 340 may be sealed by the second to fifth discharge electrodes 332, 333, 334 and 335. That is, the void 340 may be blocked from the outside of the stacked body 1000, and the discharge region 341 does not directly contact the stacked body 1000 or the sheet 100.

The length (length in the X direction) (L _s ) of each of the plurality of voids (340a, 340b, 340c, 340d) is 3% to 45%, preferably 5% to 40% of the total length (L _c ) of the composite element It can be provided as (see Fig. 24). In addition, the width (length in the Y direction) (W _s ) of the void 340 may be 3% to 45%, preferably 5% to 40% with respect to the total width (W _c ) of the composite device (Fig. 5).

In addition, based on the X direction, the length (A _s ) from the center of the discharge region 341 to the end of the void 340 is 3% to 45% of the half length (L _c /2) of the composite element, preferably May be provided in 5% to 40% (see FIG. 24). In addition, based on the Y direction, the length from the center of the discharge region 341 to the end of the void 340, that is, the width (B _s ) is 3% to 45% of the half width (W _c /2) of the composite element , Preferably it may be provided in 5% to 40% (see Fig. 5).

The thickness (length in the Z direction, H _s ) of the void 340 is formed so that the thickness of the edge region is smaller than that of other regions in a direction crossing the thickness direction (Z direction) or in the extending direction of the void 340, It is formed so that the thickness of the end in the extending direction is the smallest. For example, the edge region of the void 340 is formed such that the thickness H _s gradually decreases as the distance from the discharge region 341 increases. In this case, the thickness reduction slope may be formed to be variable rather than constant. In addition, the angle θ of the edge region or the angle θ of the end thereof is preferably 0.1° to 50°.

In addition, the overvoltage protection unit 3000 of the composite device according to the second embodiment is not limited to the above-described example, and may be configured by applying the modified examples described in the first embodiment. That is, the void 340 of the overvoltage protection unit 3000 may be variously combined with the above-described modified examples.

For example, the gap 340 is formed to decrease in thickness from the discharge region 341 toward the edge, and may be formed to have a constant thickness decrease slope as in the first modified example shown in FIG. 6. In addition, as in the second modified example shown in FIG. 7, the thickness of the void 340 decreases with a first slope toward a direction away from the discharge region, and then the thickness decreases from a predetermined position to a second slope smaller than the first slope. Can be formed to decrease.

As another example, the void 340 may have an alphabet'H' having a first space, an intermediate space, and a third space divided in the vertical direction as in the third to sixth modified examples described in FIGS. 8 to 11. I can.

4. External electrode

A plurality of external electrodes 4100 to 4600; 4000 are provided and formed on the outer surface of the stacked body 1000, and the lead electrodes 611 to 641 of the noise filter unit 6000 and the discharge electrode 330a of the overvoltage protection unit 3000 , 330b). Among the outer surfaces of the stacked body 1000, the first and second external electrodes 4100 on the surfaces where both ends of the first discharge electrodes 330a of the overvoltage protection unit 3000 are exposed, that is, the first and second surfaces. 4200) is formed. Accordingly, the first discharge electrode 330a is connected to the first and second external electrodes 4100 and 4200.

In addition, of the outer surfaces of the stacked body 1000, the third and fourth external surfaces of the first and second lead electrodes 611 and 621 or the second and third discharge electrodes 332 and 333 are exposed. The electrodes 4300 and 4400 are formed, and the fifth and sixth external electrodes are exposed on the fourth surface to which the third and fourth drawing electrodes 631 and 641 or the fourth and fifth discharge electrodes 334 and 335 are exposed. 4500, 4600) is formed. Accordingly, the second discharge electrode 332 is a third external electrode 4300, the third discharge electrode 333 is a fourth external electrode 4400, the fourth discharge electrode 334 is a fifth external electrode 4500, The fifth discharge electrode 335 is connected to the sixth external electrode 4600.

An example in which the composite device according to the first and second embodiments described above includes an overvoltage protection unit, a capacitor unit, and a noise filter unit. However, the present invention is not limited thereto, and the composite device may be configured to include all of the overvoltage protection unit 3000, the capacitor unit 2000, and the noise filter unit 6000.

25 is an exploded perspective view of a composite device according to a third embodiment of the present invention.

The composite device according to the second embodiment includes a stacked body 1000 in which a plurality of sheets 100; 121 to 129 are stacked, an overvoltage protection unit 3000 and a noise filter unit 6000 provided in the stacked body 1000. ), the capacitor unit 2000, and external electrodes 4100 to 4600; 4000 provided outside the stacked body 1000.

Here, the overvoltage protection unit 3000 and the noise filter unit 6000 may be similar or identical to the second embodiment described above. Accordingly, descriptions of the overvoltage protection unit 3000 and the noise filter unit 6000 will be omitted.

The capacitor unit 2000 may be formed under the noise filter unit 6000, for example. The capacitor part 2000 is formed on the eighth sheet 128, the first internal electrode 201 formed on the eighth sheet 128, the eighth sheet 128, and the ninth formed on the first internal electrode 201. The sheet 129 and the second internal electrode 202 formed on the ninth sheet 129 are included.

The first and second internal electrodes 201 and 202 may be connected to external electrodes formed on two opposite sides of the third to sixth external electrodes 4300, 4400, 4500, and 4600. For example, the first internal electrode 201 is connected to the sixth external electrode 4600 formed on the fourth surface of the stacked body 1000, and the second internal electrode 202 is connected to the third surface of the stacked body 1000. It may be extended to be connected to the formed fourth external electrode 4400. In this case, the internal electrodes connected to the first and second internal electrodes 201 and 202 may be connected to the ground terminal.

As described above, in the overvoltage protection unit of the composite device according to the exemplary embodiments of the present invention, in providing a discharge region between the discharge electrodes, the discharge region is formed to be spaced apart without contacting the sheet. That is, a void is provided to have a larger area than the discharge region, and an overvoltage protection unit is provided so that the discharge region is accommodated in the void. Accordingly, there is no contact with the stacked body 1000 around the discharge region, and a heat blocking region surrounding at least a part of the discharge region is provided outside the discharge region.

Accordingly, when an overvoltage such as ESD is bypassed to the discharge region, heat generated in the discharge region passes through the heat blocking region, and thus transfer of heat to the sheet may be suppressed or prevented. For this reason, it is possible to suppress or prevent grain growth on the sheet due to heat generated from the discharge region, and in other words, resistance to overvoltage or heat is improved. Accordingly, it is possible to suppress or prevent leakage current from being generated by the heat generated in the discharge region, and thereby suppress or prevent quality deterioration of the overvoltage protection unit or the composite element.

The present invention is not limited to the above-described embodiments, but may be implemented in various different forms. That is, the above embodiments are provided to complete the disclosure of the present invention and to fully inform a person of ordinary skill in the scope of the invention, and the scope of the present invention should be understood by the claims of the present application. .

1000: laminate 2000: capacitor portion
3000: overvoltage protection unit 320: air gap
321: discharge regions 311, 312: discharge electrodes

Claims (18)

Laminate;
A capacitor part provided in the stacked body;
A pair of discharge electrodes disposed so as to have a discharge region therebetween, at least partially facing each other, and a void provided in a larger area than the discharge region, wherein the discharge region is accommodated therein, and in the stacked body An overvoltage protection unit spaced apart from the capacitor unit; And
First and second external electrodes formed to face each other on both outer sides of the stacked body and connected to the capacitor unit and the overvoltage protection unit;
Composite device comprising a. The method according to claim 1,
The void is a composite element having a shape extending outward of the discharge region while receiving the discharge region therein. The method according to claim 2,
The composite device having a shape in which the thickness of the voids decreases as the edge region is further away from the discharge region. The method of claim 3,
The voids are divided into a first space, an intermediate space, and a second space in order from the lower part to the upper part in the thickness direction,
The first and second spaces have a length in a direction crossing the thickness direction compared to the intermediate space,
A composite device having a shape in which the thickness of the edge regions of the first and second spaces decreases as the distance from the discharge region increases. The method of claim 4,
The first and second spaces have a shape in which the thickness of the first and second spaces decreases as the distance from the center of the extension direction to the discharge region increases. The method of claim 3,
The composite device having an angle (θ) formed by the surfaces facing each other in the vertical direction in the edge region of the void is 0.1° to 50°. The method according to claim 2,
Each of the length (L _S ) and width (W _S ) of the void is 5% to 80% of the length (L _C ) and width (W _C ) of the composite device. The method according to claim 2,
Each of the length (L _S ) and width (W _S ) of the void is 1.5 times or more and 50 times or less of the maximum thickness (H _S ) of the void. The method according to claim 2,
The void is a composite device having a shape symmetrical in at least one of a length, a width, and a thickness direction. The method according to claim 1,
The overvoltage protection unit includes a plurality of the voids, and the plurality of voids are arranged in a vertical direction or arranged on a same plane. Laminate;
An overvoltage protection unit including discharge electrodes disposed to be spaced apart from each other in the stacked body, and a void having a horizontal distance formed longer than a separation distance between the discharge electrodes in the stacked body;
A functional unit provided in the stacked body and having a function different from that of the overvoltage protection unit;
An external electrode formed outside the laminate and connected to the functional unit and the overvoltage protection unit;
Composite device comprising a. The method of claim 11,
The voids include at least a discharge region formed between the discharge electrodes and a heat blocking region formed outside the discharge region. The method of claim 12,
The composite device having a shape in which the thickness of the edge region of the void decreases as the distance from the discharge region increases. The method of claim 11,
The functional unit is a composite device having at least one of a capacitor unit and a noise filter unit. The method of claim 14,
The functional unit includes a noise filter unit,
The noise filter unit includes at least one coil pattern and a lead electrode connected to the coil pattern,
The composite device is provided with the same number of voids as the number of lead electrodes. The method of claim 15,
Each of the length (L _S ) and width (W _S ) of the void is 3% to 45% of the length (L _C ) and width (W _C ) of the composite device. Contains internal circuitry,
An electronic device in which the composite element according to any one of claims 1 to 16 is provided in the internal circuit. The method of claim 17,
The electronic device bypassing the composite element through the internal circuit.

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