TW201815231A - Complex protection element and electronic device including the same - Google Patents

Abstract

An exemplary embodiment provides a complex protection element and an electronic device including the same. The complex protection element includes a main body, at least two internal electrodes disposed in the main body, at least one protection unit disposed between the two or more internal electrodes, at least two connection electrodes disposed in the main body so as to be connected to the two or more internal electrodes, at least two external electrodes disposed outside the main body so as to be connected to the two or more connection electrodes. Here, the connection electrodes overlap at least a portion of the protection unit.

Description

Composite protective member and electronic device containing the same

The present disclosure relates to a composite protection member, and more particularly, to a composite protection member provided in various electronic devices to protect the electronic device or a user from voltage and current.

An electronic device such as a smart phone having multiple functions includes various components integrated therein according to functions. In addition, the electronic device includes an antenna that can receive different frequency bands for each function, including a wireless local area network (LAN), Bluetooth, and global positioning system (GPS) in various frequency bands. ). Some antennas are embedded antennas mounted on a housing. Therefore, a contactor is provided for electrically connecting the antenna mounted on the housing to the internal circuit of the electronic device.

At the same time, due to the recent emphasis on luxury images and durability of smartphones, terminals made of metal materials are increasingly being provided. That is, more and more smartphones are provided in which the edges are made of metal or the case is made of metal except for the display part.

However, when using a smartphone with a metal case while charging the smartphone by using an unauthenticated charger, an electric shock may occur. That is, an inrush current may be generated when a smartphone is charged by using an unauthenticated charging or defective charger that does not include an overvoltage protection circuit or uses a low-quality component. The inrush current can be transmitted to the ground terminal of the smart phone and also to the metal case, so that users who touch the metal case can be shocked.

Therefore, a component capable of preventing damage to an internal circuit due to static electricity and protecting a user from an electric shock is necessary.

As a member for the functions described above, Korean Registered Patent No. 10-1585604 provides a main body including an external electrode mounted on a circuit board and a connection electrode for connection to a conductive pad, and the external electrode is disposed on the main body. On the bottom surface, the connection electrode is disposed on the top surface of the main body. Also, in the previous patent, the intermediate electrodes respectively connected to the external electrodes are provided on both sides (that is, edges in the main body). For the electric shock protection member described above, the S21 insertion loss (frequency characteristic of the output after input) in the wireless communication band of 700 MHz to 3 GHz needs to be less than -0.5 dB. However, according to the previous patent, since the capacitor-forming electrode has a short length and the intermediate electrode is formed to pass through a through-hole having a narrow diameter, parasitic resistance and parasitic inductance can be increased. Therefore, S21 insertion loss in the wireless communication band of 700 MHz to 3 GHz will be a problem. (Related Technical Documents) Korean Registered Patent No. 10-0876206 Korean Registered Patent No. 10-1585604

This disclosure provides a composite protection member that is disposed in an electronic device such as a smart phone to protect the electronic device and the user from overvoltage and leakage current.

The present disclosure also provides a composite protection member that can protect a user from an electric shock caused by an inrush current input from a charger and protect an internal circuit from an externally applied overvoltage.

This disclosure also provides a composite protection member that can reduce parasitic resistance and parasitic inductance to reduce losses in the wireless communication band.

According to an exemplary embodiment, a composite protective member includes: a main body; at least two internal electrodes provided in the main body; at least one protective unit provided between two or more internal electrodes; at least two connection electrodes , Which are arranged in the body and connected to two or more internal electrodes, respectively; and at least two external electrodes, which are arranged outside the body and connected to two or more connection electrodes, respectively. Here, the connection electrode overlaps at least a part of the protection unit.

The main body may be formed by laminating a plurality of sheets to each other, and external electrodes may be respectively formed on two surfaces facing each other in a direction in which the sheets are laminated.

The protection unit may be formed on the central portion of the main body in the direction of the length, width, and thickness of the main body.

The protection unit may further include an expansion member having at least one region having a diameter different from that of other regions.

The connection electrode may be provided at a central portion of the main body in the length and width directions of the main body.

The length of each of the connection electrodes may be equal to or greater than 1% of the length of the body, and the width may be equal to or greater than 5% of the width of the body.

The horizontal surface area of the connection electrode may be equal to or smaller than the horizontal surface area of each of the internal electrodes, and the horizontal surface area of the protection unit may be equal to or smaller than the horizontal surface area of the connection electrode.

The height of the connection electrode may be equal to or greater than the height of the protection unit.

Each of the two or more connection electrodes may have a height of 100 micrometers to 1000 micrometers, or the protection unit may have a height of 5 micrometers to 600 micrometers.

Two or more connection electrodes may be different in at least one of size and shape.

The composite protective member may further include a contact member connected to one of the external electrodes.

The capacitor may be formed between two or more internal electrodes, and at least one region of the internal electrode that overlaps the protection unit may serve as a discharge electrode.

One of the external electrodes may be connected to an internal circuit of the electronic device, and the other of the external electrodes may be connected to a conductor accessible by an external user.

According to another exemplary embodiment, an electronic device includes a composite protective member disposed between a conductor accessible by a user and an internal circuit to block an electric shock voltage and allow an overvoltage to pass. Here, the composite protective member includes: a main body; at least two internal electrodes that are disposed in the main body; at least one protective unit that is disposed between two or more internal electrodes; at least two connection electrodes that are disposed on In the body so as to be connected to two or more internal electrodes; and at least two external electrodes that are disposed outside the body so as to be connected to two or more connection electrodes, and the connection electrodes overlap at least a part of the protection unit.

One of the external electrodes may be connected to an internal circuit, and the other of the external electrodes may be connected to a conductor.

The electronic device may further include a contact member disposed between the conductor and the composite protective member

Hereinafter, specific embodiments will be described in detail with reference to the accompanying drawings. However, this disclosure may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

FIG. 1 is a perspective view of a composite protective member according to an exemplary embodiment, and FIG. 2 is a cross-sectional view thereof.

1 and 2, a composite protective member according to an exemplary embodiment includes: a main body 100; at least two internal electrodes 200 disposed in the main body 100; at least one protection unit 300 disposed in at least two internal electrodes 200 Between; at least two connection electrodes 400 disposed in the main body 100 so as to be connected to at least two internal electrodes 200 respectively; and external electrodes 500 disposed outside the main body 100 so as to be connected to the connection electrodes 400. Hereinafter, in an exemplary embodiment, the electronic device is protected from an externally applied overvoltage (such as an electrostatic discharge (ESD)) and a leakage current from inside the electronic device is blocked to protect a user from electric shock. The composite protective member is used as an example. 1. body

The body 100 may have a substantially hexahedral shape. That is, the main body 100 may have a substantially hexahedral shape having a predetermined length and a predetermined width in one direction (for example, the X direction) and the other direction (for example, the Y direction), and in a vertical direction (for example, Z direction). Here, the length in the X direction may be larger than each of the width in the Y direction and the height in the Z direction, and the width in the Y direction may be equal to or different from the height in the Z direction. When the width (Y direction) and height (Z direction) are different from each other, the width may be larger or smaller than the height. For example, the ratio of length, width, and height may be 2 to 5: 1: 0.3 to 1. That is, relative to the width, the length may be about 2 to about 5 times larger than the width, and the height may be 0.3 to 1 times the width. However, although the sizes on X, Y, and Z described above are described as examples, the sizes on X, Y, and Z may be based on the internal structure to which the composite protective member of the electronic device is connected and the composite protective member The shape varies in various ways. In addition, at least two internal electrodes 200, a protection unit 300, and a connection electrode 400 are disposed in the main body 100, and an external electrode 500 is disposed outside the main body 100.

The main body 100 may be formed by laminating a plurality of sheets each having a predetermined thickness. That is, the main body 100 may be formed by laminating a plurality of sheets each having a predetermined length in the X direction, a predetermined width in the Y direction, and a predetermined thickness in the Z direction. Therefore, the length and width of the main body 100 can be determined by the length and width of the sheet, and the height of the main body 100 can be determined by the number of laminations of the sheet. Meanwhile, the plurality of sheets forming the main body 100 may include a dielectric material such as a multilayer capacitance circuit (MLCC), a low temperature co-fired ceramic (LTCC), and a high temperature co-fired ceramic (LTCC). fired ceramic; HTCC). Here, the MLCC dielectric material may have a main component including at least one of barium titanate (BaTiO ₃ ) and neodymium titanate (NdTiO ₃ ), and bismuth oxide (Bi ₂ O ₃ ) may be added to the MLCC dielectric material. , At least one of silicon dioxide (SiO ₂ ), copper oxide (CuO), and magnesium oxide (MgO). The LTCC dielectric material may include aluminum oxide (Al ₂ O ₃ ), silicon dioxide (SiO ₂ ), and glass materials. In addition, each of the flakes may be made of barium titanate (BaTiO ₃ ), neodymium titanate (NdTiO ₃ ), bismuth oxide (Bi ₂ O ₃ ), barium carbonate (BaCO ₃ ), titanium dioxide (TiO ₂ ), and trioxide. Materials of at least one of neodymium (Nd ₂ O ₃ ), silicon dioxide (SiO ₂ ), copper oxide (CuO), magnesium oxide (MgO), zinc oxide (ZnO), and aluminum oxide (Al ₂ O ₃ ) form. Alternatively, the sheet may be formed of a material having varistor characteristics such as praseodymium (Pr), bismuth (Bi), or a strontium titanate-based ceramic material. Therefore, each of the sheets may have a predetermined dielectric constant, for example, 5 to 20,000, desirably 7 to 5000, and more desirably 200 to 3000.

Also, all of the plurality of sheets may have the same thickness as each other, and the thickness of at least one of them may be greater than or less than each of the others. That is, when at least one sheet is provided between the internal electrodes 200 to form the ESD protection unit 300 on at least a part of the area and a plurality of sheets are laminated above and below the internal electrode 200 to form the connection electrode 400 on at least a part of the area, Each of the sheets may have the same thickness as each other, and the thickness of at least one of the sheets may be larger or smaller than each of the other sheets. For example, the thickness of each of the sheets forming the ESD protection unit 300 between the internal electrodes 200 may be greater than the thickness of each of the other sheets. Meanwhile, the plurality of sheets may have a thickness of, for example, 1 micrometer to 5000 micrometers or equal to or less than 3000 micrometers. That is, depending on the thickness of the main body 100, each of the sheets may have a thickness of 1 to 5000 micrometers, ideally 5 to 300 micrometers. The thickness and number of laminated layers can be adjusted according to the size of the composite protective member. That is, when applied to a small composite protective member, the sheet may have a small thickness, and when applied to a large composite protective member, the sheet may have a large thickness. In addition, when the same number of sheets are laminated, the thickness of the sheet may decrease as the size and height of the composite protective member decrease, and the thickness of the sheet may increase as the size of the composite protective member increases. Alternatively, a thin sheet may be applied to a large composite protective member. In this case, the number of laminated layers can be increased. Here, the sheet may have a thickness that is damaged when ESD is applied. That is, although the number of laminations of the flakes or the thickness of the flakes are different from each other, at least one of the flakes may have a thickness that is not damaged when the ESD is repeatedly applied.

At the same time, a lower cover layer (not shown) and an upper cover layer (not shown), which are respectively disposed on the lowermost layer and the uppermost layer of the main body 100, may be further provided. Here, the lowermost layer may serve as a lower cover layer, and the uppermost layer may serve as an upper cover layer. The separately provided lower cover layer and the upper cover layer may have the same thickness as each other, and may be formed by laminating a plurality of magnetic material sheets. However, the lower cover layer and the upper cover layer may have different thicknesses from each other. For example, the thickness of the upper cover layer may be greater than the thickness of the lower cover layer. Here, a non-magnetic sheet (for example, a glassy sheet) may be further provided on the surface (ie, the lower surface and the upper surface) of the lower cover layer and the upper cover layer formed of the magnetic material sheet. Also, the thickness of each of the lower cover layer and the upper cover layer may be greater than the thickness of each of the inner sheets. That is, the thickness of the cover layer may be larger than one sheet. Therefore, when the lowermost sheet and the uppermost sheet serve as a lower cover and an upper cover layer, each of the lowermost sheet and the uppermost sheet may have a thickness greater than each of the sheets therebetween. Meanwhile, the lower cover layer and the upper cover layer may be formed of glass flakes, and the surface of the main body 100 may be coated with a polymer or a glass material. 2.Internal electrode

In the main body 100, at least two internal electrodes 200 (210, 220) may be separated from each other by a predetermined distance. That is, in the lamination direction of the sheet (ie, the Z direction), at least two internal electrodes 200 may be separated from each other by a predetermined distance. In addition, at least two internal electrodes 200 may be provided with a protection unit 300 therebetween. For example, in the Z direction, the first internal electrode 210 may be disposed below the protection unit 300, and the second internal electrode 220 may be disposed above the protection unit 300. Alternatively, at least one internal electrode may be further disposed between the first and second internal electrodes 200 and the lowermost and uppermost sheets. Here, the internal electrodes 200 are connected to the connection electrodes 400 and to the protection unit 300, respectively. That is, one side of the first internal electrode 210 is connected to the first connection electrode 410 and the other side is connected to the protection unit 300. In addition, one side of the second internal electrode 220 is connected to the second connection electrode 420 and the other side is connected to the protection unit 300. Here, surfaces of the first and second internal electrodes 210 and 220 facing each other are connected to the protection unit 300.

Each of the internal electrodes 200 may be made of a conductive material including, for example, aluminum (Al), silver (Ag), gold (Au), platinum (Pt), palladium (Pd), and nickel (Ni) And a metal of at least one of copper (Cu) or a metal alloy thereof. In the case of an alloy, for example, an alloy of silver and palladium can be used. Meanwhile, in the case of aluminum, alumina (Al ₂ O ₃ ) can be formed on the surface of aluminum, and aluminum can be maintained in its interior during the forming process. That is, when aluminum is formed on the sheet, the aluminum contacts air, and the surface of the aluminum is oxidized to form alumina (Al ₂ O ₃ ) thereon and the aluminum is maintained on the inside as it is. Thus, the internal electrodes 200 may be aluminum oxide (Al ₂ O ₃₎ is formed to cover aluminum, aluminum oxide (Al ₂ O ₃₎ is a thin insulating layer having a porous surface. Alternatively, in addition to aluminum, various metals can also be used, which have an insulating layer formed on the surface thereof, ideally a porous insulating layer. When the porous insulating layer is formed on the surface of the internal electrode 200, the ESD voltage can be easily and smoothly discharged through the protection unit 300. That is, although it will be described later, the protection unit 300 contains a porous insulating material and is discharged via micropores. Here, when the porous insulating layer is formed on the surface of the internal electrode 200, in addition to the micropores of the protection unit 300, the number of micropores can be increased and thus the discharge efficiency can be further improved.

Also, each of the internal electrodes 200 may have a predetermined length in the X direction, a predetermined width in the Y direction, and a predetermined thickness in the Z direction. For example, the internal electrode 200 may have a thickness of, for example, 1 micrometer to 10 micrometers. Here, at least one region of the internal electrode 200 may have a small thickness, or at least one region may be removed from the internal electrode 200 to expose a sheet. However, although at least one region of the internal electrode 200 has a larger or smaller thickness, or at least one region is removed from the internal electrode, the total connection state can be maintained without causing any conductivity problem. In addition, the internal electrode 200 may have a length in the X direction and a width in the Y direction, and the length and width are smaller than the length and width of the main body 100. That is, the length and width of the internal electrode 200 may be smaller than the length and width of the sheet. For example, the length and width of the internal electrode 200 may be 10% to 90% of the length and width of the main body 100 or the sheet. Also, the surface area of the internal electrode 200 may be 10% to 90% with respect to the surface area of each of the sheets. That is, the surface area of the internal electrode 200 disposed on one sheet in the main body 100 is 10% to 90% with respect to the surface area of the sheet. Meanwhile, the internal electrode 200 may have various shapes such as a square, a rectangle, and a spiral having a predetermined pattern shape, a predetermined width, and a predetermined distance.

The internal electrode 200 can serve as both a capacitor and a discharge electrode of the protection unit 300. The capacitor is formed by the first and second internal electrodes 200 and a sheet therebetween. The capacitance may be adjusted according to an overlapping surface area between the first and second internal electrodes 200 and a thickness of a sheet between the first and second internal electrodes 200. In addition, the areas of the first and second internal electrodes 200 overlapping with the protection unit 200 serve as discharge electrodes, so that an overvoltage such as ESD applied from the outside is transmitted to the protection unit 300, and the overvoltage passed through the protection unit 300 is transmitted to Bypass to, for example, the ground terminal of the electronics. 3. Protection unit

The at least one protection unit 300 is disposed between the internal electrodes 200 and allows an overvoltage such as ESD introduced from the outside to be bypassed to the ground terminal of the electronic device. That is, an overvoltage from the outside of an electronic device employing a composite protective member is introduced to the protection unit 300 via, for example, the second connection electrode 420 and the second internal electrode 220, and via the first internal electrode 210 and the first connection electrode 410. In addition, it bypasses the internal circuit of the electronic device. At least one of the planar shape and the cross-sectional shape of the protection unit 300 may have a shape including a substantially circular shape, an oval shape, a rectangular shape, a square shape, and a polygon equal to or larger than a pentagon shape, and the shape may have a predetermined thickness. That is, the protection unit 300 may have a cylindrical, hexahedral, or polyhedral shape.

The protection unit 300 may overlap at least a part of the first and second internal electrodes 210 and 220. For example, the first internal electrode 210 and the second internal electrode 220 may overlap the horizontal surface area of the protection unit 300 by 10% to 100%. That is, the length and width of the protection unit 300 may be 10% to 100% of the length and width of the first and second internal electrodes 210 and 220 in the X and Y directions, respectively, and may not deviate from the first internal electrode. 210 and the second internal electrode 220. In addition, the protection unit 300 may be disposed on a central region of the first internal electrode 210 and the second internal electrode 220. Ideally, the protection unit 300 may be disposed on a central area of the main body 100. That is, the protection unit 300 may be provided on the central area according to a predetermined diameter, and the central area is disposed at half of the length direction (ie, the X direction) and half of the width direction (ie, the Y direction) of the main body 100. Alternatively, when a plurality of protection units 300 are provided, the protection unit 300 may be separated from the center area of the main body 100 by a predetermined distance. Therefore, the central region of the protection unit 300 may be disposed on the central region of the main body 100 or the central regions of the first and second internal electrodes 210 and 220.

The thickness of the protection unit 300 may be 1% to 20% of the thickness of the main body 100, and the length may be 3% to 50% of the length of the main body 100 in one direction. Here, when the plurality of protection units 300 are provided, the total thickness of the plurality of protection units 300 may be 1% to 50% of the thickness of the main body 100. In addition, the protection unit 300 may have a long hole shape having a long length in at least one direction (for example, the X direction), and the long length may be 5% to 75% of the X direction length of the sheet. In addition, the Y-direction width of the protection unit 300 may be 3% to 50% of the Y-direction width of the sheet. The thickness and diameter of the protection unit 300 may be equal to or smaller than the thickness and diameter of the connection electrode 400. For example, the thickness of the protection unit 300 may be 1/5 times to 1 times the thickness of the connection electrode 400 and the diameter may be 1/10 times to 1 times the diameter of the connection electrode 400. In detail, the protection unit 300 may have a diameter of, for example, 50 μm to 1000 μm and a thickness of, for example, 5 μm to 600 μm. Here, as the thickness of the protection unit 300 decreases, a discharge inception voltage decreases.

The protection unit 300 may include at least one opening in a predetermined area of a sheet defined between the internal electrodes 200. That is, each of the at least one opening may serve as the overvoltage protection unit 300. Here, the protection unit 300 may be formed by applying an overvoltage protection material to at least a part of the openings or burying the openings. That is, the protection unit 300 may include an opening, an inside of the opening is empty, and an overvoltage protection material is formed on at least a part of the opening. To form an over-voltage protection material, a through-hole having a predetermined size may be defined between the internal electrodes 200, and the over-voltage protection material may be applied to at least a portion of the through-hole or buried the through-hole. Here, the overvoltage protection material may be applied to at least a part of a side surface of the perforation, at least a part of at least one of an upper part and a lower part of the perforation, and an inside of the perforation in a predetermined thickness. Also, the polymer material that is volatilized during the plastic processing can be used to form an overvoltage protection material on a portion of the perforation.

The protection unit 300 may use a conductive material and an insulating material as an overvoltage protection material. Here, the insulating material may be a porous insulating material having a plurality of pores. For example, the protection unit 300 may be formed by printing a mixed material of a conductive ceramic and an insulating ceramic on a sheet. Meanwhile, the protection unit 300 may be formed on at least one sheet. That is, for example, the protection unit 300 may be formed on each of the two sheets that are vertically laminated, and the first and second internal electrodes 210 and 220 may be respectively formed on the sheets so as to be spaced apart from and connected to each other. To the protection unit 300. A detailed description of the structure and materials of the protection unit 300 will be described later. At the same time, the discharge start voltage can be adjusted according to the structure, material and size of the protection unit 300. For example, the composite protection member may have a discharge initiation voltage of 1 kV to 30 kV. 4. Connect the electrodes

The connection electrode 400 may be disposed in the main body 100 and between the internal electrode 200 and the external electrode 500. That is, the connection electrode 400 is provided to connect the internal electrode 200 to the external electrode 500. Therefore, the connection electrode 400 may include a first connection electrode 410 and a second connection electrode 420 connected to the first and second external electrodes 500 (510 and 520) and the first and second internal electrodes 200 (210 and 220), respectively. At least one of a planar shape and a cross-sectional shape of the connection electrode 400 may have a shape including a substantially circular shape, an oval shape, a rectangular shape, a square shape, and a polygon equal to or larger than a pentagon shape, and the shape may have a predetermined thickness. That is, the connection electrode 400 may have a cylindrical, hexahedral, or polyhedral shape. The connection electrode 400 may overlap at least a part of the protection unit 300. Ideally, the connection electrode 400 may be disposed on a central portion of the main body 100 and overlap the protection unit 300.

The connection electrode 400 is formed by defining an opening at a predetermined region of at least one sheet laminated on the internal electrode, and the opening is buried by using a conductive material. For example, the connection electrode 400 may be made of a metal containing at least one of aluminum (Al), silver (Ag), gold (Au), platinum (Pt), palladium (Pd), nickel (Ni), and copper (Cu). Or a metal alloy thereof. Alternatively, in addition to metal, the connection electrode 400 may be formed of various conductive materials.

The connection electrode 400 may have: a height in the Z direction, that is, a height in the vertical direction, which is equal to or different from the height in the Z direction of the protection unit 300; and a width in each of the X and Y directions, which is equal to or different from The width of the protection unit 300. That is, the height of the connection electrode 400 may be equal to or greater than the height of the protection unit 300, and the diameter or width may be equal to or greater than the diameter or width of the protection unit 300. Ideally, the height of the connection electrode 400 may be greater than the height of the protection unit 300, and the planar area is larger than the planar area of the protection unit 300. For example, the height of each of the first connection electrode 410 and the second connection electrode 420 may be 0.5 to 3 times the height of the protection unit 300. In addition, the total height of the first connection electrode 410 and the second connection electrode 420 may be 1 to 6 times the height of the protection unit 300. For example, the first connection electrode 410 and the second connection electrode 420 may have a total height of 100 micrometers to 1000 micrometers, ideally 200 micrometers to 900 micrometers, and more desirably 400 micrometers to 700 micrometers. Here, the first connection electrode 410 and the second connection electrode 420 may have different heights and different widths. The X-direction width of the connection electrode 400 may be 1% to 90% of the X-direction width of the main body 100, and the Y-direction width may be 5% to 90% of the Y-direction width of the main body 100. Here, the X-direction width and the Y-direction width of the connection electrode 400 may be equal to or different from each other. That is, a width including the X-direction width and the Y-direction width of one region of the connection electrode 400 may be equal to or different from the width of the other region. In other words, the connection electrode 400 may have at least one region having an asymmetric shape. In addition, the X-direction width and Y-direction width of the connection electrode 400 may be 1 to 10 times the X-direction width and Y-direction width of the protection unit 300 and 1/10 times the X-direction width and Y-direction width of the internal electrode 200. To 1x. That is, the width of the connection electrode 400 may be smaller than the length and width of the main body 100 in the X direction and the Y direction, equal to or larger than the width of the protection unit 300 and equal to or smaller than the width of the internal electrode 200.

The connection electrode 400 functions to connect the external electrode 500 to the internal electrode 200. Therefore, an overvoltage such as ESD applied via the external electrode 500 is transmitted to the internal electrode 200 and the protection unit 300 via the connection electrode 400, and an overvoltage transmitted to the protection unit 300 is transmitted to the external electrode again via the internal electrode 200 and the connection electrode 400. 500. In addition, since the connection electrode 400 is disposed on the center portion of the main body 100 and the width is ideally larger than the width of the protection unit 300, the parasitic resistance and parasitic inductance can be reduced. That is, the parasitic resistance and the parasitic inductance can be reduced compared to a state where the connection electrode 400 is disposed outside the main body 100. Therefore, the insertion loss of the S210 in the wireless communication band of 700 MHz to 3 GHz can be reduced. In addition, since the width of the connection electrode 400 is ideally larger than the width of the protection unit 300, damage caused by repeated ESD voltages can be prevented to suppress an increase in the discharge start voltage. That is, for example, the protection unit 300 allows the ESD voltage to be bypassed because the energy attributed to the ESD generates a spark inside the protection unit 300. Here, when the connection electrode 400 has a small thickness, the connection electrode 400 may be damaged due to the repeated ESD voltage to increase the discharge start voltage. However, when the connection electrode 400 has a thickness equal to or greater than 10 micrometers, the connection electrode 400 can be prevented from being damaged due to repeated ESD voltages, and therefore an increase in the discharge start voltage can be prevented. 5.External electrode

The external electrodes 500 (510 and 520) may be respectively disposed on two outer surfaces of the main body 100 facing each other. For example, the external electrodes 500 may be respectively disposed on two surfaces (ie, a bottom surface and a top surface) of the main body 100 facing each other in the Z direction (ie, the vertical direction). Also, the external electrodes 500 may be connected to the connection electrodes 400 in the main body 100, respectively. Here, one of the external electrodes 500 may be connected to an internal circuit such as a printed circuit board in the electronic device, and the other of the external electrodes may be connected to the outside of the electronic device, such as a metal case. For example, the first external electrode 510 may be connected to an internal circuit, and the second external electrode 520 may be connected to a metal case. Also, the second external electrode 520 may be connected to the metal case via a conductive element (for example, a contactor or a conductive pad).

Each of the external electrodes 500 described above may be formed by various methods. That is, the external electrode 500 may be formed by a dipping or printing method using a conductive paste or other various methods such as deposition, sputtering, and plating. Meanwhile, the external electrode 500 may be formed on the entire surface or a part of the bottom surface and the top surface of the body 100. That is, the external electrode 500 may be formed on the bottom surface and the top surface in addition to a predetermined width from edges of the bottom surface and the top surface. For example, the surface area of the external electrode 500 may be 50% to 95% of the surface area of the bottom surface and the top surface except for a predetermined width from the edges of the bottom surface and the top surface. Also, the external electrode 500 may be formed on the entire area of the bottom surface and the top surface, and extend upward and downward from it to be formed on other side surfaces. That is, in addition to the bottom surface and the top surface facing upward in the Z direction, the external electrode 500 may also extend to a predetermined region of the surface facing in each of the X and Y directions. For example, when immersed in a conductive paste, the external electrode 500 may be formed on side surfaces in the X and Y directions and on top and bottom surfaces in the Z direction. In contrast to this, when formed by methods such as printing, deposition, sputtering, and electroplating, the external electrode 500 may be formed on predetermined surface areas of the bottom surface and the top surface in the Z direction. That is, the external electrode 500 may be formed on a bottom surface mounted on a printed circuit board and a top surface connected to a metal case and other areas depending on a forming method and processing conditions. Alternatively, the external electrode 500 may be formed of a conductive metal. For example, the external electrode 500 may be formed of at least one metal selected from the group consisting of gold, silver, platinum, copper, nickel, palladium, and alloys thereof. Here, the external electrode 500 may have a portion formed on at least a portion of the external electrode 500 connected to the connection electrode 400 (ie, at least one surface of the body 100), and a portion connected to the connection electrode 400 may be connected to the connection electrode 400. The material is formed of the same material. For example, when the connection electrode is formed of copper, at least a part of a region of the external electrode 500 that contacts the connection electrode 400 may be formed of copper. Here, as described above, copper may be formed by a dipping or printing method using a conductive paste or by a method such as deposition, sputtering, and electroplating. Ideally, the external electrode 500 may be formed by electroplating. To form the external electrode 500 through a plating process, a seed layer may be formed on the top surface and the bottom surface of the main body 100, and then a plating layer may be formed from the seed layer to form the external electrode 500. Here, at least a part of the external electrode 500 connected to the connection electrode 400 may be the entire top surface and the bottom surface of the main body 100 or a partial region thereof.

Alternatively, the external electrode 500 may further include at least one plating layer. The external electrode 500 may be formed of a metal layer such as copper and silver, and at least one plating layer may be formed on the metal layer. For example, the external electrode 500 may be formed by laminating a copper layer, a nickel plating layer, and a tin or tin / silver plating layer. Alternatively, the plating layer may be formed by laminating a copper plating layer and a tin plating layer or a laminated copper plating layer, a nickel plating layer, and a tin plating layer. In addition, the external electrode 500 may be formed by mixing, for example, a multi-component glass frit having a main component of bismuth oxide (Bi ₂ O ₃ ) or silicon dioxide (SiO ₂ ) of 0.5% to 20% and metal powder. . Here, the mixture of the glass frit and the metal powder may be prepared in a paste form and applied to both surfaces of the main body 100. Since the external electrode 500 contains a glass frit, the adhesion between the external electrode 500 and the main body 100 can be improved, and the contact reaction between the connection electrode 400 and the external electrode 500 can be improved. Also, a conductive paste including glass may be applied, and then at least one plating layer may be formed thereon to form the external electrode 500. That is, the external electrode 500 may be formed of a metal layer including glass and at least one plating layer formed on the metal layer. For example, the external electrode 500 may be formed such that a layer containing at least one of glass frit, silver, and copper is formed, and then a nickel plating layer and a tin plating layer are sequentially formed through electrodeless plating. Here, the thickness of the tin plating layer may be equal to or greater than the thickness of the nickel plating layer. Alternatively, the external electrode 5000 may be formed only by at least one plating layer. That is, the external electrode 500 may be formed by forming at least one layer of a plating layer without applying a paste through at least a single plating process. Meanwhile, the external electrode 5000 may have a thickness of 2 μm to 100 μm, the nickel plating layer may have a thickness of 1 μm to 10 μm, and the tin or tin / silver plating layer may have a thickness of 2 μm to 10 μm. 6. Surface modification components

Meanwhile, a surface modification member (not shown) may be formed on at least one surface of the main body 100. The surface modification element may be formed by distributing, for example, an oxide on the surface of the body 100 before the external electrode 500 is formed. Here, the oxide may be dispersed and distributed on the surface of the body 100 in a crystalline or amorphous state. When the external electrode 500 is formed through a plating process, the surface modification elements may be distributed on the surface of the main body 100 before the plating process. That is, the surface modification elements may be distributed before a part of the external electrode 500 is formed by the printing process, or after the plating process is performed and before the plating process. Alternatively, when a printing process is not performed, the surface modification elements may be distributed and then an electroplating process may be performed. Here, at least a part of the surface modifying element distributed on the surface may be melted.

Meanwhile, at least a part of the surface modification element may have the same size and be uniformly distributed on the surface of the main body 100, and at least a part of it may have a size different from each other and be unevenly distributed. Also, the recessed portion may be defined in at least a portion of a surface of the main body 100. That is, the surface modification element may be formed to form a protruding portion, and at least a part of a region on which the surface modification element is not formed may be recessed to form a recessed portion. Here, the surface modification element may have at least a portion deeper than a surface of the body 100. That is, the surface modification element may be inserted into the main body 100 to a predetermined depth and protrude from the surface of the main body 100 to the remaining thickness. Here, the thickness of the portion inserted into the body 100 may be 1/20 to 1 times the average diameter of the oxide particles. That is, all or a part of the oxide particles may be provided in the body 100. Alternatively, the oxide particles may be provided only on the surface of the body 100. Therefore, the oxide particles may have a hemispherical shape or a spherical shape on the surface of the body 100. Also, as described above, the surface modification elements may be distributed on a part of the surface of the main body 100 or in a film shape on at least one region. That is, the oxide particles are distributed on the surface of the body 100 in an island shape to form a surface-modified element. That is, the oxide in a crystalline or amorphous state may be distributed on the surface of the body 100 in an island shape, and thus at least a part of the surface of the body 100 may be exposed. Also, at least two oxides may be connected to each other to form a surface modifying element on at least one region in a film shape and on at least some regions in an island shape. That is, at least two oxide particles are aggregated or adjacent to each other to form a thin film shape. However, even when the oxide exists in a particle state or two or more particles are aggregated or connected to each other, at least a part of the surface of the body 100 may be exposed to the outside through the surface modification element.

Here, the total surface area of the surface modification element may be about 5% to about 90% of the total surface area of the main body 100. Although the plating dispersion phenomenon on the surface of the main body 100 can be controlled based on the surface area of the surface modification element, when the surface modification element is excessively formed, the conductive patterns in the main body 100 and the external electrode 400 may have difficulty in contacting each other. That is, when the surface modifying element is formed on a surface area smaller than 5% of the surface area of the main body 100, the plating spreading phenomenon is almost uncontrolled, and when the surface modifying element is formed on a surface larger than 90% of the surface area of the main body 100 When the area is on, the conductive patterns in the main body 100 and the external electrode 400 may not contact each other. Therefore, the surface modification element can be desirably formed on a surface region capable of controlling the plating dispersion phenomenon and allowing the conductive patterns in the main body 100 and the external electrode 400 to contact each other. For this reason, the surface modification element may be formed on a surface area that is 10% to 90%, ideally 30% to 70%, and more desirably 40% to 50% of the surface area of the main body 100. Here, the surface area of the body 100 may be the surface area of one surface or the surface areas of the six surfaces of the body 100 forming a hexahedron. Meanwhile, the thickness of the surface modification element may be equal to or less than 10% of the thickness of the body 100. That is, the thickness of the surface modification element may be 0.01% to 10% of the thickness of the body 100. For example, the size of the surface modification element may be 0.1 micrometer to 50 micrometers, and therefore, from the surface of the main body 100, the thickness of the surface modification element may be 0.1 micrometer to 50 micrometers. That is, in addition to the surface modification element being inserted into a region in the surface of the main body 100, the thickness of the surface modification element from the surface of the main body 100 may be 0.1 micrometers to 50 micrometers. Therefore, when the thickness of the surface modification element inserted into the body 100 is increased, the thickness of the surface modification element may be greater than 0.1 micrometers to 50 micrometers. When the thickness of the surface-modified element is less than 0.01% of the thickness of the body 100, the plating spreading phenomenon is almost uncontrolled, and when the thickness of the surface-modified element is greater than 10% of the thickness of the body 100, the body 100 and the external electrode 400 The conductive patterns may not touch each other. That is, the surface modification element may have various thicknesses according to the characteristics of the material (conductivity, semi-conductivity, insulation, and magnetic properties) and the size, distribution amount, and degree of aggregation of the oxide powder.

As described above, since the surface modification element is formed on the surface of the main body 100, the surface of the main body 100 may have two regions that are different in composition. That is, the surface modification element may have a composition which is different in area depending on whether or not the surface modification element is formed. For example, a component (that is, an oxide) of the surface modification element may be present on a region on which the surface modification element is formed, and a component of the body 100 (that is, a composition of a sheet) may be present on the surface not formed On the area of the surface modified element. As described above, the surface modification elements are distributed on the surface of the main body 100 before the electroplating process, and the roughness can be applied to the surface of the main body 100 and thus the surface can be modified. Therefore, the plating process can be performed uniformly, and thus the shape of the external electrode 500 can be controlled. That is, the surface of the main body 100 may have at least one region that is different in resistance from other regions, and when the plating process is performed in a state where the resistance is unstable, the plating layer grows unevenly. In order to solve the phenomenon described above, the surface of the main body 100 can be modified by the oxide distributed in the particle state or the molten state on the surface of the main body 100, and the growth of the plating layer can be controlled.

Here, at least one of the following oxides may be used in the particles or in the molten state to achieve uniform surface resistance of the main body 100: for example, bismuth oxide (Bi ₂ O ₃ ), boron dioxide (BO ₂ ), Boron trioxide (B ₂ O ₃ ), zinc oxide (ZnO), Co ₃ O ₄ , silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), manganese oxide (MnO), boric acid (H ₂ BO ₃ ), calcium carbonate (Ca (CO ₃ ) ₂ ), calcium nitrate (Ca (NO ₃ ) ₂ ), and calcium carbonate (CaCO ₃ ). Meanwhile, the surface modification element may be formed on at least one sheet in the main body 100. That is, the conductive patterns of various shapes can be formed on the sheet through the electroplating process, and the shape of the conductive patterns can be controlled by forming the surface modification element.

3 and 4 are schematic cross-sectional views and cross-sectional photos of a composite protective member according to an exemplary embodiment. That is, the protection unit 300 may have one region having a thickness different from that of each of the other regions. 3 and 4 are schematic enlarged cross-sectional views and cross-sectional photos of a part of the protection unit 300.

As illustrated in FIGS. 3 (a) and 4 (a), the protection unit 300 may be made of an insulating material. Here, the insulating material may be a porous insulating material (not shown) having a plurality of pores. That is, a plurality of pores (not shown) may be defined in the protection unit 300. Since the pores are defined, it is easier to bypass an overvoltage such as ESD. In addition, the protection unit 300 may be formed by mixing a conductive material and an insulating material. For example, the protection unit 300 may be formed by mixing a conductive material and an insulating material. In this case, the protection unit 300 may be formed by mixing a conductive ceramic and an insulating ceramic at a mixing ratio of 10:90 to 90:10. As the mixing ratio of the insulating ceramic increases, the discharge starting voltage can increase, and as the mixing ratio of the conductive ceramic increases, the amplification starting voltage can decrease. Therefore, the mixing ratio of the conductive ceramic and the insulating ceramic can be adjusted so as to obtain a predetermined discharge starting voltage.

In addition, the protection unit 300 may have a predetermined laminated structure by laminating a conductive layer and an insulating layer. That is, the protection unit 300 may be formed by laminating a conductive layer and an insulating layer at least once when dividing the conductive layer and the insulating layer. For example, the protection unit 300 may have a two-layer structure in which a conductive layer and an insulating layer are laminated, or a three-layer structure in which a conductive layer, an insulating layer, and a conductive layer are laminated. In addition, the conductive layer 310 (311 and 312) and the insulating layer 320 may be repeatedly laminated multiple times to form a three-layer structure or more. For example, as illustrated in (b) of FIG. 3, the protection unit 300 may have a three-layer structure in which a first conductive layer 311, an insulating layer 320, and a second conductive layer 312 are laminated. FIG. 4 (b) is a photograph showing an ESD protective layer having a three-layer structure between the sheet and the internal electrode. Meanwhile, when the conductive layer and the insulating layer are laminated multiple times, the uppermost layer and the lowermost layer may be conductive layers. Here, a plurality of pores (not shown) may be defined in at least a part of the conductive layer 310 and the insulating layer 320. For example, since the insulating layer 320 disposed between the conductive layers 310 has a porous structure, the insulating layer 320 may have multiple pores.

In addition, the gap may be further defined in a predetermined area of the protection unit 300. For example, the void may be defined between the layers where the conductive material and the insulating material are mixed, and the void may be defined between the conductive layer and the insulating layer. That is, the first mixed layer, the void, and the second mixed layer where the conductive material and the insulating material are mixed may be laminated, and the conductive layer, the void, and the insulating layer may be laminated. For example, as illustrated in FIG. 3 (c), the protection unit 300 may be formed by laminating the first conductive layer 311, the first insulating layer 321, the gap 330, the second insulating layer 322, and the second conductive layer 312. form. That is, the insulating layers 320 (321 and 322) may be disposed between the conductive layers 310 (311 and 312), and the gap 330 may be defined between the insulating layers 320. FIG. 4 (c) is a cross-sectional photograph of the protection unit 300 having the laminated structure described above. Alternatively, the conductive layer, the insulating layer, and the void may be repeatedly laminated to form the protection unit 300. Meanwhile, when the conductive layer 310, the insulating layer 320, and the gap 330 are laminated, all of them may have the same thickness as each other, or the thickness of at least one of them may be smaller than the thickness of each of the others. For example, the thickness of the gap 330 may be smaller than the thickness of each of the conductive layer 310 and the insulating layer 320. In addition, the thickness of the conductive layer 310 may be equal to the thickness of the insulating layer 320 or greater than or less than the thickness of the insulating layer 320. Meanwhile, the void 330 may be formed by filling a polymer material, and then a forming process is performed to remove the polymer material. For example, a first polymer material containing conductive ceramics, a second polymer material containing insulating ceramics, and a third polymer material containing no conductive ceramics and insulating ceramics can be filled into the through holes, and then the forming process is performed. The polymer material is removed to form a conductive layer, an insulating layer, and a void. Meanwhile, the void 330 may be formed when the layer is not delaminated. For example, the insulating layer 320 may be disposed between the conductive layers 311 and 312, and the gap 330 may be defined by connecting a plurality of pores in the insulating layer 320 in a vertical or horizontal direction. That is, the void 330 may be defined by a plurality of voids in the insulating layer 320. Alternatively, the void may be defined in the conductive layer 310 by a plurality of holes.

Meanwhile, the conductive layer 310 used in the protection unit 300 may have a predetermined resistance and allow a current to flow therethrough. For example, the conductive layer 310 may be a resistor having several ohms to several millions of ohms. When an overvoltage such as ESD is introduced, the conductive layer 310 reduces the energy level to prevent the composite protective member from being structurally damaged due to the overvoltage. That is, the conductive layer 310 functions as a heat sink that converts electrical energy into thermal energy. The conductive layer 310 may be formed of a conductive ceramic, and the conductive ceramic may use a mixture containing at least one of the following: lanthanum (La), nickel, cobalt, copper, zinc, ruthenium (Ru), silver, palladium, platinum, tungsten , Iron, and bismuth. Also, the conductive layer 310 may have a thickness of 1 micrometer to 50 micrometers. That is, when the conductive layer 310 includes a plurality of layers, its total thickness may be 1 micrometer to 50 micrometers.

Also, the insulating layer 320 used in the protection unit 300 may be made of a discharge-inducing material and function as an electrical barrier having a porous structure. The insulating layer 320 may be made of an insulating ceramic, and the insulating ceramic may include a ferroelectric material having a dielectric constant of 50 to 50,000. For example, the insulating ceramic may be formed of a dielectric material powder such as MLCC and a mixture containing at least one of: zirconia (ZrO), zinc oxide (ZnO), barium titanate (BaTiO ₃ ), pentoxide Two neodymium (Nd ₂ O ₅ ), barium carbonate (BaCO ₃ ), titanium dioxide (TiO ₂ ), neodymium (Nd), bismuth (Bi), zinc (Zn), and alumina (Al ₂ O ₃ ). When the plurality of pores each have a diameter of 1 nanometer to 5 micrometers, the insulating layer 320 may have a porous structure with a porosity of 30% to 80%. Here, the minimum distance between the pores may be 1 nanometer to 5 micrometers. That is, although the insulating layer 320 is formed of an electrically insulating material through which a current cannot flow, since a void is formed, a current can flow through the void. Here, as the pore size or porosity increases, the discharge start voltage can decrease, and conversely, as the pore size or porosity decreases, the discharge start voltage can increase. However, when the pore size is greater than 5 microns or the porosity is greater than 80%, the protection unit 300 may fail to maintain its shape. Therefore, the pore size and porosity of the insulating layer 320 can be adjusted to adjust the discharge start voltage while maintaining the shape of the protection unit 300. Meanwhile, when the protection unit 300 is formed of a mixed material of an insulating material and a conductive material, an insulating ceramic having micropores and its porosity can be used as the insulating material. In addition, the resistance of the insulating layer 320 may be smaller than that of the sheet due to the micropores, and the discharge may be partially performed through the micropores. That is, since the micro holes are defined in the insulating layer 320, a partial discharge is performed through the micro holes. The insulating layer 320 may have a thickness of 1 to 50 micrometers. That is, when the insulating layer 320 includes a plurality of layers, the total thickness thereof may be 1 micrometer to 50 micrometers.

FIG. 5 is a schematic cross-sectional view of a protection unit 300 of a composite protection member according to another exemplary embodiment. That is, as illustrated in (a) of FIG. 5, the protection unit 300 may include a gap 330. That is, the over-voltage protection material may not be filled into the opening through the sheet to define a void 330 in the protection unit 300. Also, at least one region of the perforation of the protection unit 300 may be made of a porous insulating material. That is, as illustrated in (b) of FIG. 5, a porous insulating material may be applied to the sidewall of the perforation to form an insulating layer 320, and as illustrated in (c) of FIG. 5, the insulating layer 320 may be formed on the perforated On at least one of the upper part and the lower part.

Meanwhile, FIG. 6 is a schematic cross-sectional view of a protection unit 300 according to still another exemplary embodiment of a composite protection member. As illustrated in FIG. 6, the protection unit 300 may further include a discharge inducing layer 340 disposed between the internal electrodes 200 (210 and 220) and the overvoltage protection unit 300. That is, the discharge inducing layer 340 may be further disposed between the internal electrode 200 and the protection unit 300. Here, the internal electrode 200 may include conductive layers 211a and 212a and porous insulating layers 211b and 212b provided on at least one surface of the conductive layers 211a and 212a. Alternatively, the internal electrode 200 may be a conductive layer without a porous insulating layer formed.

When the protection unit 300 is made of a porous insulating material, a discharge inducing layer 340 may be formed. Here, the discharge inducing layer 340 may be made of a dielectric layer having a density greater than that of the protection unit 300. That is, the discharge inducing layer 340 may be made of a conductive material or an insulating material. For example, when the protection unit 300 is made of porous zirconia (ZrO) and the internal electrode 200 is made of aluminum, a discharge inducing layer 349 made of zirconia aluminum (AlZrO) may be formed on the protection unit 300 and the internal electrode Between 200. Meanwhile, titanium oxide (TiO) instead of zirconia (ZrO) may be used to protect the unit 300, and in this case, the discharge inducing layer 340 may be made of titanium aluminum oxide (TiAlO). That is, the discharge inducing layer 340 may be formed via a reaction between the internal electrode 200 and the protection unit 300. Alternatively, the discharge inducing layer 340 may be formed via a reaction between the internal electrode 200, the protection unit 300, and the sheet material. In this case, discharge may be induced between the layer 340 by internal electrode material (e.g., aluminum), a guard cell material (e.g., zirconium oxide (of ZrO)) and a sheet material (e.g., barium titanate (BaTiO ₃₎₎ of Reaction is formed. The discharge inducing layer 340 can be formed by reacting with a sheet material. That is, the discharge inducing layer 340 may be formed in a region where the protection unit 300 contacts the sheet via a reaction between the protection unit 300 and the sheet. Therefore, the discharge inducing layer 340 may surround the protection unit 300. Here, the discharge induction layer 340 between the protection unit 300 and the discharge electrode 310 and the discharge induction layer 340 between the protection unit 300 and the sheet may have different compositions from each other. Meanwhile, the discharge inducing layer 340 may have at least one region removed, or at least one region having a thickness different from that of other regions. That is, the discharge-inducing layer 340 may have at least one removed region and be formed discontinuously, or have at least one region having a different thickness and unevenly formed. The discharge inducing layer 340 may be formed during a forming process. That is, when the forming process is performed at a predetermined temperature, the discharge electrode material, the ESD protection material, and the like may diffuse to each other to form a discharge induction layer 340 between the internal electrode 200 and the protection unit 300. Meanwhile, the thickness of the discharge inducing layer 340 may be 10% to 70% of the thickness of the protection unit 300. That is, a part of the thickness of the protection unit 300 may be converted into the discharge inducing layer 340. Therefore, the thickness of the discharge inducing layer 340 may be smaller than the thickness of the protection unit 300 and equal to the thickness of the internal electrode 200. The discharge inducing layer 340 may allow the ESD voltage to be induced to the protection unit 300, or the level of discharge energy induced to the protection unit 300 may be reduced. Therefore, the ESD voltage can be discharged more easily to improve the discharge efficiency. In addition, since the discharge inducing layer 340 is formed, it is possible to prevent different kinds of materials from diffusing into the protection unit 300. That is, the sheet material and the internal electrode material can be prevented from diffusing to the protection unit 300, and the overvoltage protection material can be prevented from diffusing to the outside. Therefore, the discharge inducing layer 340 can function as a diffusion barrier and thus prevent the protection unit 300 from being damaged. Meanwhile, the protection unit 300 may further include a conductive material, and in this case, the conductive material may be coated with an insulating ceramic. For example, as described by using FIG. 3 (a), when the protection unit 300 is formed by mixing a porous insulating material and a conductive material, the conductive material may be coated with nickel oxide (NiO), copper oxide (CuO ), Tungsten oxide (WO) or similar. Therefore, a conductive material together with a porous insulating material may be used as a material of the protection unit 300. In addition, when a conductive material is further used to protect the unit 300 in addition to the porous insulating material (for example, as illustrated in (b) and (c) of FIG. 3), the insulating layer 320 is formed on the two conductive layers 311 and Between 312, the discharge inducing layer 340 may be formed between the conductive layer 310 and the insulating layer 320. Meanwhile, the internal electrode 200 may have a partially removed shape. That is, the internal electrode 200 may be partially removed, and the discharge induction layer 340 may be formed in the removed region. However, although the internal electrode 200 may be partially removed, since the internal electrode 200 maintains the shape of the overall connection, the electrical characteristics may not be reduced.

The internal electrode 200 may be made of a metal or a metal alloy in which an insulating layer is formed on a surface thereof. That is, the internal electrode 200 may include conductive layers 211a and 212a and insulating layers 211b and 212b formed on at least one surface of the conductive layers 211a and 212a. Here, the porous insulating layers 211 b and 212 b may be formed on at least one surface of the internal electrode 200. That is, the porous insulating layers 211b and 212b may be formed on one of the surfaces not contacting the protection unit 300 and the other surface of the protection unit 300, or on one surface of the protection unit 300 and contacting the protection unit 300. All on the other surface. Further, the porous insulating layers 211b and 212b may be formed on at least the entire surface or at least a part of the conductive layers 211a and 212a. Also, the porous insulating layers 211b and 212b may have at least one region removed or having a small thickness. That is, the porous insulating layers 211b and 212b may not be formed on at least one region on the conductive layers 211a and 212a, and the thickness of at least one region of the porous insulating layers 211b and 212b may be thinner or thicker than other regions. The internal electrode described above may have a surface on which an oxide film is formed during a forming process and an internal portion formed of aluminum to maintain electrical conductivity. That is, when aluminum is formed on the sheet, the aluminum contacts air, and the surface of the aluminum is oxidized to form alumina Al ₂ O ₃ thereon) and the aluminum is maintained on the inside as it is. Thus, the internal electrodes 200 may be aluminum oxide (Al ₂ O ₃₎ is formed to cover aluminum, aluminum oxide (Al ₂ O ₃₎ is a thin insulating layer having a porous surface. Alternatively, in addition to aluminum, various metals can also be used, which have an insulating layer formed on the surface thereof, ideally a porous insulating layer.

As described above, as illustrated in FIG. 7, a composite protective member according to an exemplary embodiment may be disposed between the metal case 10 and the internal circuit 20. That is, one of the external electrodes 500 may be connected to a ground terminal, and the other of the external electrodes may be connected to the metal case 10 of the electronic device. Here, the ground terminal may be disposed in the internal circuit 20. For example, the first external electrode 510 may be connected to a ground terminal, and the second external electrode 520 may be connected to the metal case 10. In addition, a conductive element such as a contactor and a conductive pad may be further disposed between the second external electrode 520 and the metal case 10. Therefore, the electric shock voltage transmitted from the ground terminal of the internal circuit 20 to the metal case can be blocked, and the ESD voltage applied from the outside to the internal circuit can be bypassed to the ground terminal. That is, the composite protection member according to the exemplary embodiment may prevent current from flowing between the external electrodes 500 at the rated voltage and the shock voltage, and enables the current to flow through the protection unit 300 so that the overvoltage is bypassed to ground Terminal. Meanwhile, the composite protection member may have a discharge initiation voltage greater than a rated voltage and less than an ESD voltage. For example, the composite protection member may have a rated voltage of 100V to 240V, the electric shock voltage may be equal to or greater than the operating voltage of the circuit, and the ESD voltage generated by external static electricity may be greater than the electric shock voltage. In addition, a communication signal (ie, an alternating current frequency) from the outside can be transmitted to the internal circuit 20 through a capacitance formed between the internal electrodes 200. Therefore, even when the metal case 10 is used as an antenna without preparing an additional antenna, a communication signal can be received from the outside. As a result, the composite protective member according to the exemplary embodiment can block the electric shock voltage, bypass the ESD voltage to the ground terminal, and apply a communication signal to the internal circuit.

Also, when the main body 100 is formed by laminating a plurality of sheets having high voltage resistance characteristics, the composite protective member according to the exemplary embodiment can maintain an insulation resistance state, for example, because a defective charger introduces 310V from an internal circuit The shock voltage into the metal case 10 prevents leakage current from flowing, and the protection unit 300 can also maintain a high insulation resistance state by bypassing the overvoltage without damaging the components when the overvoltage is introduced from the metal case 10 to the internal circuit 20. That is, since the protection unit 300 includes a porous insulating material having a porous structure to allow current to flow through the micropores, and further includes a conductive material that reduces the energy level to convert electrical energy into thermal energy, an overvoltage introduced from the outside can be bypassed to protect the circuit. Therefore, insulation damage may not occur even in an overvoltage situation, and therefore, the protection unit 300 may be disposed in an electronic device including the metal case 10 to continuously prevent an electric shock voltage generated from a defective charger from passing through the electronic device. The metal casing 10 is transmitted to a user. At the same time, a general multilayer capacitance circuit (MLCC) protects components from electric shock voltage, but protection against ESD is weak. Therefore, when the ESD is repeatedly applied, a spark may be generated at a leak point due to charging to cause a component failure phenomenon. However, according to the exemplary embodiment, since the protection unit 300 including a porous insulating material is formed between the internal electrodes, an overvoltage is transmitted through the protection unit 300, and thus at least a part of the body 100 is not damaged.

In addition, since the connection electrode 400 is disposed on the center portion of the main body 100 and the width is ideally larger than the width of the protection unit 300, the parasitic resistance and parasitic inductance can be reduced. That is, the parasitic resistance and the parasitic inductance can be reduced compared to a state where the connection electrode 400 is disposed outside the main body 100. Therefore, the S21 insertion loss in the wireless communication band of 700 MHz to 3 GHz can be reduced. In addition, since the width of the connection electrode 400 is ideally larger than the width of the protection unit 300, damage caused by repeated ESD voltages can be prevented to suppress an increase in the discharge start voltage. That is, for example, the protection unit 300 allows the ESD voltage to be bypassed because the energy attributed to the ESD generates a spark inside the protection unit 300. Here, when the connection electrode 400 has a small thickness, the connection electrode 400 may be damaged due to the repeated ESD voltage to increase the discharge start voltage. However, when the connection electrode 400 has a thickness equal to or greater than 10 micrometers, the connection electrode 400 can be prevented from being damaged due to repeated ESD voltages, and thus a phenomenon that the discharge start voltage is increased can be prevented.

Meanwhile, according to an exemplary embodiment, a composite protective member that is disposed in an electronic device of a smart phone to protect the electronic device from an overvoltage such as ESD and block a leakage current from the inside of the electronic device to thereby protect a user is described as Instance. However, in addition to a smart phone, the composite protection member according to the exemplary embodiment may also be disposed in an electric and electronic device to perform at least two protection functions.

FIG. 8 is a cross-sectional view of a composite protective member according to another exemplary embodiment.

Referring to FIG. 8, a composite protective member according to another exemplary embodiment includes: a main body 100 in which a plurality of sheets are laminated; at least two internal electrodes 200 that are disposed in the main body 100; and at least one protective unit 300 that is disposed Between at least two internal electrodes 200; a connection electrode 400 disposed in the body 100 so as to be connected to the at least two internal electrodes 200; and an external electrode 500 disposed outside the body 100 so as to be connected to the connection electrode 400. Here, the protection unit 300 may further include an expansion member 350 such that at least one region has a wider width. That is, the protection unit 300 may be formed by further including the expansion member 350 so that at least one region has a wider width. The width of the extension part 350 may be 1% to 150% of the diameter of the protection unit 300. That is, the width of the expansion member 350 may be 1% to 150% of the width of other regions on the protection unit 300 where the expansion member 350 is not formed. For example, the expansion member 350 may have a diameter obtained by adding 10 to 100 micrometers to the diameter of the protection unit 300. In addition, the height of the expansion member 350 may be 10% to 70% of the total height of the protection unit 300. When the expansion member 350 is formed as described above, the expansion member 350 may block the short-circuit path of the protection unit 300. That is, when an overvoltage such as ESD is repeatedly applied, a melting phenomenon of the connection electrode 400 may occur, and thus the connection electrode material may block to the perforated sidewall of the protection unit 300 to cause a short-circuit phenomenon. However, since the expansion members 350 having different diameters are formed on the protection unit 300, the short-circuit path may be blocked.

9 and 10 are cross-sectional views of a composite protective member according to a modified example of the exemplary embodiment. A modified example of the illustrative embodiment further includes a contact member that contacts a conductor such as the metal case 10. That is, the composite protective member is disposed between the metal case 10 and the internal circuit 20, and as illustrated in each of FIGS. 9 and 10, the contact member 610 having a jig shape or formed by using a conductive material layer The contact member 620 may be disposed on the second external electrode 520 of the composite protective member. The contact members 610 and 620 have an elastic force to absorb an impact when an external force is externally applied to the electronic device, and are made of a material including a conductive material. Meanwhile, the first external electrode 510 may be disposed to contact the internal circuit 20, and a layer of a metal such as stainless steel may be further disposed between the internal circuit 20 and the first external electrode 510.

The contact member may have a jig shape as illustrated in FIG. 9. The jig-shaped contact member may include: a support portion 611 disposed on the composite protective member; a contact portion 612 disposed above the support portion 611 to face a conductor such as a metal case and at least a portion thereof contacting the conductor; and a connection portion 613, It is disposed between one side of the support portion 611 and one side of the contact portion 612 so as to connect the support portion 611 to the contact portion 612 with elastic force. Here, the connection portion 613 connects one end of the support portion 611 to one end of the contact portion 612 and has a curvature. That is, the connecting portion 613 has an elastic force. With the elastic force, the connecting portion 613 is pressed toward the circuit board 20 when it is pressed by an external force, and returns to the original state when the external force is released. Therefore, the contact member 610 may be made of a metal material having an elastic force, so that the connection portion 613 has an elastic force.

In addition, the contact member according to the exemplary embodiment may include conductive rubber, conductive silicon, an elastic body for inserting a conductive wire, and a gasket, and a surface of the gasket is coated or bonded with a conductor. That is, as illustrated in FIG. 10, the contact member 620 may include a conductive material layer. For example, a conductive gasket may have an interior made of a non-conductive elastic material and an exterior coated with a conductive material. Although not illustrated, the conductive gasket may include: an insulating elastic core having a through hole defined therein; and a conductive layer surrounding the insulating elastic core. The insulating elastic core has a tube shape with a perforation defined therein. Although the insulating elastic core may have a substantially rectangular or circular cross section, exemplary embodiments are not limited thereto. That is, the insulating elastic core may have various shapes. For example, perforations may not be included in the insulating elastic core. The insulating elastic core may be made of silicon or elastic rubber. The conductive layer may surround the insulating elastic core. The conductive layer may include at least one metal layer made of, for example, gold, silver, and copper. Alternatively, the conductive powder may be mixed to the elastic core without forming a conductive layer.

Meanwhile, the contact members 610 and 620 may be horizontally disposed with respect to the main body 100 of the composite protective member and mounted on the internal circuit 20. That is, although the contact members 610 and 620 are disposed on the top surface of the main body 100 in the modified examples of FIGS. 9 and 10, the contact members 610 and 620 may be disposed on the side surfaces while being spaced apart from the main body 100 and installed. It is connected to the internal circuit 20 via an external electrode 510 of the main body 100. Comparative examples and illustrative examples

Check the insertion loss according to the position and size of the connection electrode of the composite protective member. Therefore, the composite protective member according to the exemplary embodiment is manufactured to have the structure in FIG. 2. That is, the protection unit 300 is disposed on the center portion of the main body 100, and the internal electrodes 210 and 220 larger than the protection unit 300 are disposed above and below the protection unit 300, and the size is larger than the protection unit 300 and smaller than the internal electrodes 210 and 220. The connection electrodes 410 and 420 are disposed above and below the internal electrodes 210 and 220. Here, the connection electrodes 410 and 420 are disposed in a central region inside the main body 100 and overlap the protection unit 300.

Also, the electric shock protection member according to the comparative example was manufactured as illustrated in FIG. 11. That is, based on the structure suggested in Korean Registered Patent No. 10-1585604, the protection unit 300a is disposed on the center portion of the main body 100, and the first internal electrodes 210a and 210b are disposed below and above the protection unit 300a. Also, each of the second internal electrodes 220a and 220b and the third internal electrodes 230a and 230b is disposed below and above the internal electrodes 210a and 210b, and each of the connection electrodes 400a and 400b is connected to the first to the first Three internal electrodes 210, 220, and 230. Here, the protection unit 300a according to the comparative example is formed under the same conditions as those of the protection unit 300 according to the exemplary embodiment. Also, the connection electrodes 410a and 410b according to the comparative example are not provided on the center portion of the main body 100, but are provided at positions adjacent to the edge, that is, from the edge by halving the area between the edge and the center portion From a quarter of the area. Also, the diameters of the connection electrodes 410a and 410b according to the comparative example are smaller than the diameters of the connection electrodes 410 and 420 according to the exemplary embodiment. That is, the diameter of the connection electrodes 410a and 410b according to the comparative example may be 1/4 of the diameter of the connection electrodes 410 and 420 according to the exemplary embodiment. Also, the conditions other than the conditions described above are the same as those of the exemplary embodiment. However, the comparative example further includes a second internal electrode 220 and a third internal electrode 230.

The frequency characteristics of the electric shock protection member 410b according to the comparative example and the composite protection member 410b according to the exemplary embodiment are illustrated in FIGS. 13 and 14 and shown in Table 1. 【Table 1】

As shown in FIGS. 13 and 14 and Table 1, the electric shock protection member according to the comparative example generates a loss equal to or greater than -0.5 dB at a frequency equal to or higher than 1.24 GHz, and the composite protection unit according to the exemplary embodiment generates The loss is smaller than that of the comparative example. That is, since the connection electrode is disposed on the center portion of the main body and has a wide width, compared with the case where the connection electrode is disposed on the outer portion and has a small width, parasitic resistance and parasitic inductance can be minimized and insertion loss can be reduced. Decrease.

Since the connection electrode is ideally disposed on a central portion of the main body and has a width larger than that of the protection unit, the composite protection member according to the exemplary embodiment can reduce parasitic resistance and parasitic inductance. Therefore, the S21 insertion loss in the wireless communication band of 700 MHz to 3 GHz can be reduced.

Also, since the width of the connection electrode is desirably larger than the width of the protection unit, damage caused by repeated ESD voltages can be prevented to suppress an increase in the discharge start voltage.

Although the disclosure has been described with reference to specific embodiments, it is not limited thereto. Therefore, those skilled in the art will readily understand that various modifications and changes can be made to it without departing from the spirit and scope of the invention as defined by the scope of the accompanying patent application.

10‧‧‧ metal case

20‧‧‧Internal circuit / circuit board

100‧‧‧ main body

200‧‧‧ Internal electrode

210, 210a, 210b‧‧‧First internal electrode

211a, 212a‧‧‧ conductive layer

211b, 212b‧‧‧ porous insulation layer

220, 220a, 220b‧‧‧Second internal electrode

230, 230a, 230b‧‧‧ Third internal electrode

300‧‧‧ESD protection unit / overvoltage protection unit

300a‧‧‧protection unit

310‧‧‧ conductive layer

311‧‧‧first conductive layer

312‧‧‧Second conductive layer

320‧‧‧ Insulation

321‧‧‧first insulating layer

322‧‧‧Second insulation layer

330‧‧‧Gap

340‧‧‧discharge induction layer

350‧‧‧ Expansion Unit

400, 410a, 410b

410‧‧‧first connection electrode

420‧‧‧Second connection electrode

500‧‧‧External electrode

510‧‧‧First external electrode

520‧‧‧Second external electrode

610‧‧‧contact parts

611‧‧‧ support

612‧‧‧Contact Section

613‧‧‧connection part

620‧‧‧contact parts

Exemplary embodiments can be understood in more detail from the following description taken in conjunction with the accompanying drawings, in which: FIG. 1 is a cross-sectional view of a composite protective member according to an exemplary embodiment. FIG. 2 is a cross-sectional view of a composite protective member according to an exemplary embodiment. 3 and 4 are cross-sectional views and photographs illustrating a cross-section of a composite protective member according to an exemplary embodiment of the composite protective member. FIG. 5 is a cross-sectional view of a composite protective member according to another exemplary embodiment. FIG. 6 is a cross-sectional view of a composite protective member according to still another exemplary embodiment. FIG. 7 is an equivalent circuit diagram of a composite protective member according to an exemplary embodiment. FIG. 8 is a cross-sectional view of a composite protective member according to another exemplary embodiment. 9 and 10 are cross-sectional views of a composite protective member according to a modified example of the exemplary embodiment. 11 is a cross-sectional view of a composite protective member according to a comparative example. 12 and 13 are graphs illustrating frequency characteristics of a composite protection element according to a comparative example and an exemplary embodiment.

Claims (16)

A composite protective member includes: a main body; at least two internal electrodes provided in the main body; at least one protective unit provided between the two or more internal electrodes; at least two connection electrodes , Provided in the body and connected to the two or more internal electrodes, respectively; and at least two external electrodes, provided outside the body and connected to the two or more internal connections, respectively An electrode, wherein the connection electrode overlaps at least a part of the protection unit. The composite protective member according to item 1 of the patent application scope, wherein the main body is formed by laminating a plurality of sheets to each other, and the external electrodes are respectively formed above the lamination direction of the sheets On both surfaces of each other. The composite protective member according to item 2 of the scope of patent application, wherein the protection unit is formed on a central portion of the main body in a direction of a length, a width, and a thickness of the main body. The composite protection member according to item 3 of the patent application scope, wherein the protection unit further includes an expansion member having at least one region having a diameter different from that of other regions. The composite protective member according to claim 3 or claim 4, wherein the connection electrode is provided at the center of the main body in the direction of the length and the width of the main body. Somewhere. The composite protective member according to item 5 of the scope of patent application, wherein the length of each of the connection electrodes is equal to or greater than 1% of the length of the body and the width is equal to or greater than 5% of the width of the body . The composite protective member according to item 6 of the patent application scope, wherein a horizontal surface area of the connection electrode is equal to or smaller than a horizontal surface area of each of the internal electrodes, and a horizontal surface area of the protection unit is equal to or less than The horizontal surface area of the connection electrode is described. The composite protective member according to item 7 of the patent application scope, wherein a height of the connection electrode is equal to or greater than a height of the protection unit. The composite protective member according to item 8 of the scope of patent application, wherein each of the two or more connection electrodes has a height of 100 μm to 1000 μm, or the protection unit has a height of 5 μm to 600 μm the height of. The composite protective member according to item 1 of the scope of patent application, wherein the two or more connection electrodes are different in at least one of size and shape. The composite protective member according to item 1 of the scope of patent application, which may further include a contact member connected to one of the external electrodes. The composite protective member according to item 1 of the scope of patent application, wherein a capacitance is formed between the two or more internal electrodes, and at least one region of the internal electrode that overlaps with the protection unit serves as a discharge electrode . The composite protective member according to claim 1 or claim 12, wherein one of the external electrodes is connected to an internal circuit of an electronic device, and the other of the external electrodes is connected to an externally usable The conductor that the person touches. An electronic device includes a composite protective member disposed between a conductor accessible by a user and an internal circuit to block an electric shock voltage and allow an overvoltage to pass, wherein the composite protective member includes: a main body; at least Two internal electrodes disposed in the main body; at least one protection unit disposed between the two or more internal electrodes; at least two connection electrodes disposed in the main body so as to be connected to The two or more internal electrodes; and at least two external electrodes disposed outside the main body so as to be connected to the two or more two connection electrodes, and the connection electrodes and the protection unit At least part of it overlaps. The electronic device according to item 14 of the patent application scope, wherein one of the external electrodes is connected to the internal circuit, and the other of the external electrodes is connected to the conductor. The electronic device according to item 14 of the patent application scope further includes a contact member disposed between the conductor and the composite protective member.