JP2015035362A - Electrostatic protection component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress property changes of a discharge inducing part and to reduce parasitic capacitance occurring between a coil and an ESD suppressor.SOLUTION: An electrostatic protection component includes: a prime field 4 where insulator layers 10 are laminated; a coil L1 which is composed of internal conductors 21 to 24 and arranged in the prime field 4; and an ESD suppressor SP1 which includes first and second discharge electrodes 11, 12 arranged separately from each other and a discharge inducing part 13 that is in contact with the electrodes 11, 12 in the way that first and second side surface parts 11b, 12b in the electrodes 11, 12 are connected to each other and that contains metallic particles and which is arranged in the prime field 4 side by side to the coil L1 in a laminating direction. The electrodes 11, 12 are positioned nearer on the coil L1 side than the discharge inducing part 13 seen from the laminating direction. The prime field 4 is positioned in the way that it covers the entire discharge inducing part 13 when viewed from the coil L1 side in the laminating direction and has a cavity 14 which is in contact with the first and second side surface parts 11b, 12b and the discharge inducing part 13.

Description

  The present invention relates to an electrostatic protection component.

  The element body formed by laminating a plurality of insulator layers, a plurality of internal conductors connected to each other, a coil disposed in the element body, and first and second discharges disposed separately from each other There is known an electrostatic protection component that includes an ESD suppressor that includes an electrode and is disposed in an element body (see, for example, Patent Document 1). Discharges that are in contact with the first and second discharge electrodes and contain metal particles so as to connect the first and second discharge electrodes that are spaced apart from each other and the mutually facing portions of the first and second discharge electrodes An ESD suppressor configured to include an induction part, and the electrostatic discharge protection part arranged so that the cavity part is in contact with each other and the discharge induction part facing each other in the first and second discharge electrodes Is also known (see, for example, Patent Document 2).

JP 2003-123936 A JP 2011-243896 A

  In the ESD suppressor (electrostatic protection component), the first and second discharge electrodes are spaced apart from each other, and therefore, when a voltage of a predetermined value or more is applied between the electrodes, discharge occurs in the separated portion. The discharge inducing portion has a function of facilitating the generation of a discharge in the separated portion of the first and second discharge electrodes. That is, the ESD suppressor has an ESD (Electro-Static Discharge) absorption performance.

  According to the electrostatic protection component described in Patent Document 2, since the ESD suppressor has the discharge inducing portion and the cavity portion is disposed, between the first and second discharge electrodes (parts facing each other). Discharge can be appropriately generated, and desired ESD absorption performance can be easily ensured. For this reason, even in an electrostatic protection component having a configuration in which a coil and an ESD suppressor are arranged in an element body as described in Patent Document 1, in order to easily secure a desired ESD absorption performance, a discharge inducing unit It is conceivable to introduce a hollow portion.

  However, when a discharge inducing part and a cavity part are introduced into an electrostatic protection component having a configuration in which a coil and an ESD suppressor are arranged in the element body, the following problems may occur. When a coil composed of an internal conductor and an ESD suppressor configured to include a discharge inducing part are disposed in the element body, it is necessary to obtain an element body in which the internal conductor and the discharge inducing part are disposed. There is. The element body is usually obtained through a process of heat treatment such as firing. At this time, the material constituting the inner conductor may diffuse into the discharge inducing portion.

  When the material constituting the inner conductor diffuses into the discharge inducing portion, the characteristics of the discharge inducing portion change. When the material constituting the inner conductor, i.e., the conductor material diffuses into the discharge inducing portion, the electrical resistance of the discharge inducing portion decreases, and a discharge occurs between the first and second discharge electrodes at a relatively low voltage. . If the amount of the conductor material diffused into the discharge inducing portion is large, the discharge inducing portion is substantially a conductor and the first and second discharge electrodes are short-circuited.

  In an electrostatic protection component having a configuration in which a coil and an ESD suppressor are arranged in an element body, a parasitic capacitance is formed between an internal conductor constituting the coil and first and second discharge electrodes or discharge inducing portions included in the ESD suppressor. Occurs. Since the discharge inducing portion in contact with the first and second discharge electrodes contains metal particles and has a high dielectric constant, the parasitic capacitance generated between the coil and the ESD suppressor is relatively large due to this. The parasitic capacitance becomes one of factors such as noise characteristic deterioration or transmission signal characteristic deterioration.

  An object of the present invention is to provide an electrostatic protection component capable of suppressing a change in characteristics of a discharge inducing portion and reducing a parasitic capacitance generated between a coil and an ESD suppressor.

  The electrostatic protection component according to the present invention includes an element body formed by laminating a plurality of insulator layers, and a plurality of internal conductors connected to each other, and a coil disposed in the element body is separated from each other. The first and second discharge electrodes disposed, and the discharge inducing portion in contact with the first and second discharge electrodes and containing metal particles so as to connect the opposing portions of the first and second discharge electrodes; And an ESD suppressor disposed in the element body so as to be aligned with the coil in the stacking direction of the plurality of insulator layers, and the first and second discharge electrodes are discharge-induced when viewed in the stacking direction. The element body is located on the coil side of the part, and the element body is located so as to cover the entire discharge inducing part when viewed in the stacking direction from the coil side. Has a cavity that touches the trigger To have.

  In the electrostatic protection component according to the present invention, the cavity portion is in contact with the mutually opposing portions of the first and second discharge electrodes and the discharge inducing portion. Thereby, the discharge between the mutually opposing parts in the first and second discharge electrodes is appropriately generated, and a desired ESD absorption performance can be easily ensured.

  The hollow portion is further positioned so as to cover the entire discharge inducing portion when viewed in the stacking direction from the coil side. That is, the hollow portion is located between the coil (inner conductor) and the discharge inducing portion. The cavity is usually formed by the disappearance of a material such as a resin in the process of performing a heat treatment for obtaining an element body. Since the temperature at which the material for forming the cavity disappears is lower than the material that forms the inner conductor, the cavity is formed until the material that forms the inner conductor can diffuse. Therefore, even if the material constituting the inner conductor can be diffused, the cavity is located between the coil (inner conductor) and the discharge inducing portion, so the material constituting the inner conductor by the cavity. Is prevented from diffusing into the discharge inducing portion. As a result, a change in the characteristics of the discharge inducing portion can be suppressed.

  The hollow portion is positioned so as to cover the entire discharge inducing portion when viewed in the stacking direction from the coil side. That is, the cavity part having a lower dielectric constant than the discharge inducing part is located between the coil (inner conductor) and the discharge inducing part. For this reason, even if the discharge inducing part contains metal particles and the dielectric constant is high, the cavity part having a lower dielectric constant than the discharge inducing part is located between the coil (inner conductor) and the discharge inducing part. Thus, the cavity portion reduces the parasitic capacitance generated due to the dielectric constant of the discharge inducing portion. As a result, parasitic capacitance generated between the coil and the ESD suppressor can be reduced.

  The melting point of the material constituting the inner conductor may be lower than the melting point of the material constituting the metal particles. When the melting point of the material constituting the inner conductor is lower than that of the metal particles, the material constituting the inner conductor is likely to diffuse. However, since the cavity is positioned so as to cover the entire discharge inducing portion when viewed in the stacking direction from the coil side, even if the material constituting the internal conductor is relatively easily diffused, It is possible to reliably suppress the material constituting the inner conductor from reaching the discharge inducing portion.

  The first discharge electrode has a first side surface portion extending in one direction orthogonal to the stacking direction, and the second discharge electrode has a second side surface portion extending in one direction, The second discharge electrodes may be arranged so as to be separated from each other so that the first side surface portion and the second side surface portion face each other. In this case, in the first discharge electrode, the first side surface portion facing the second side surface portion becomes a dischargeable region, and in the second discharge electrode, the second side surface portion facing the first side surface portion is a dischargeable region. Become. In the configuration in which the first and second discharge electrodes are arranged so that the first and second side surfaces face each other, the first and second discharge electrodes are arranged so that the ends of the first and second discharge electrodes face each other. It is possible to set a longer dischargeable region as compared with the configuration in which the is disposed. The longer the area that can be discharged, the better the durability as an electrostatic protection component.

  ADVANTAGE OF THE INVENTION According to this invention, the electrostatic protection component which can suppress the change of the characteristic of a discharge induction part and can reduce the parasitic capacitance generate | occur | produced between a coil and an ESD suppressor can be provided.

It is a perspective view which shows the electrostatic protection component which concerns on 1st Embodiment. It is a disassembled perspective view which shows the structure of the element | base_body which concerns on 1st Embodiment. It is a figure which shows the cross-sectional structure along the III-III line | wire shown by FIG. It is a figure which shows the cross-sectional structure along the IV-IV line | wire shown by FIG. It is a flowchart which shows the manufacturing method of the electrostatic protection component which concerns on 1st Embodiment. It is a perspective view which shows the electrostatic protection component which concerns on 2nd and 3rd embodiment. It is a disassembled perspective view which shows the structure of the element | base_body which concerns on 2nd Embodiment. It is a figure which shows the cross-sectional structure containing the 1st ESD suppressor and the 3rd ESD suppressor of the electrostatic protection component which concerns on 2nd Embodiment. It is a figure which shows the cross-sectional structure containing the 2nd ESD suppressor and the 4th ESD suppressor of the electrostatic protection component which concerns on 2nd Embodiment. It is a figure which shows the cross-sectional structure containing the 1st ESD suppressor and the 4th ESD suppressor of the electrostatic protection component which concerns on 2nd Embodiment. It is a disassembled perspective view which shows the structure of the element | base_body which concerns on 3rd Embodiment. It is a figure which shows the cross-sectional structure containing the 1st ESD suppressor and the 2nd ESD suppressor of the electrostatic protection component which concerns on 3rd Embodiment. It is a figure which shows the cross-sectional structure containing the 3rd ESD suppressor and the 4th ESD suppressor of the electrostatic protection component which concerns on 3rd Embodiment. It is a figure which shows the cross-sectional structure containing the 1st ESD suppressor and the 3rd ESD suppressor of the electrostatic protection component which concerns on 3rd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

(First embodiment)
First, with reference to FIGS. 1-4, the structure of the electrostatic protection component 1 which concerns on 1st Embodiment is demonstrated. FIG. 1 is a perspective view showing an electrostatic protection component according to this embodiment. FIG. 2 is an exploded perspective view showing the configuration of the element body. FIG. 3 is a diagram showing a cross-sectional configuration along the line III-III shown in FIG. FIG. 4 is a diagram showing a cross-sectional configuration along the line IV-IV shown in FIG.

  The electrostatic protection component 1 according to the present embodiment is an electronic component that is mounted on a circuit board of an electronic device and protects the electronic device from ESD. As shown in FIGS. 1 to 4, the electrostatic protection component 1 includes an element body 4 having a substantially rectangular parallelepiped shape, an external electrode 5, an external electrode 6, an external electrode 7, and an external element disposed on the outer surface of the element body 4. An electrode 8, a coil L <b> 1 disposed inside the element body 4, and an ESD suppressor SP <b> 1 having ESD absorption performance disposed inside the element body 4 are provided. Hereinafter, the stacking direction of the element body 4 is the Z direction (up and down direction), the short side direction in the end surface and cross section of the stacking direction is the X direction, and the long direction is the Y direction.

  The element body 4 is configured by laminating a plurality of insulator layers 10. Each insulator layer 10 has a substantially rectangular shape. Each insulator layer 10 is an insulator having electrical insulation and is formed of a sintered body of an insulator green sheet. In the actual element body 4, each insulator layer 10 is integrated to such an extent that the boundary between them cannot be visually recognized. The element body 4 has, as an outer surface, a pair of end faces 4a and 4b facing each other and four side faces adjacent to the end faces 4a and 4b. Of the four side surfaces, one side surface 4c is defined as a surface (mounting surface) that faces another electronic device (not shown) (for example, a circuit board or an electronic component).

  The external electrode 5 and the external electrode 6 are disposed at both end positions in the longitudinal direction (Y direction in the figure) of one side surface 4 c of the element body 4. The external electrode 7 is formed so as to cover the entire surface of one end face 4a of the element body 4 and a part thereof wraps around four side faces adjacent to the end face 4a. That is, the external electrode 7 is disposed on the one end face 4 a side of the element body 4. The external electrode 8 is formed so as to cover the entire surface of the other end surface 4b of the element body 4 and a part thereof wraps around four side surfaces adjacent to the end surface 4b. That is, the external electrode 8 is disposed on the other end face 4 b side of the element body 4. The external electrode 5 and the external electrode 7 are connected to each other, and the external electrode 6 and the external electrode 8 are connected to each other (see FIG. 4).

  In the coil L1, the end portions of the conductor 21, the conductor 22, the conductor 23, and the conductor 24, which are a plurality of internal conductors juxtaposed in the stacking direction of the insulating layer 10 inside the element body 4, are each through-hole conductor 31. , 32 and 33 are connected. The conductors 21 to 24 are arranged in the order of the conductor 21, the conductor 22, the conductor 23, and the conductor 24 from the side close to the side surface 4 c of the element body 4 in the stacking direction of the insulator layer 10.

  The through-hole conductor 31 is located between the conductor 21 and the conductor 22 and electrically connects the conductor 21 and the conductor 22. The through-hole conductor 32 is located between the conductor 22 and the conductor 23 and electrically connects the conductor 22 and the conductor 23. The through-hole conductor 33 is located between the conductor 23 and the conductor 24 and electrically connects the conductor 23 and the conductor 24. Each through-hole conductor 31-33 functions as a part of coil L1.

The end 24a of the conductor 24 is drawn out to the end face 4a of the element body 4 and exposed to the end face 4a, and is connected to the external electrode 7 (see FIG. 4). The end 21 a of the conductor 21 is drawn out to the end face 4 b of the element body 4 and exposed to the end face 4 b, and is connected to the external electrode 8. End 24a of the conductor 24 corresponds to the one end E1 ₁ of the coil L1, the end 21a of the conductor 21 corresponds to the other end E1 ₂ of the coil L1. Therefore, the coil L1 is electrically connected to the external electrodes 7 and 8. The DC resistance of the coil L1 can be measured at each of the external electrodes 7 and 8.

  The ESD suppressor SP1 is formed at a position closer to the side surface 4c of the element body 4 than the coil L1 in the stacking direction. The ESD suppressor SP1 includes a first discharge electrode 11 and a second discharge electrode 12 that are spaced apart from each other in the same insulator layer 10, and a discharge inducing portion that connects the first discharge electrode 11 and the second discharge electrode 12. 13.

  The first discharge electrode 11 has an end portion 11a and a first side surface portion 11b extending in the longitudinal direction of the insulator layer 10 (Y direction in the figure). The end 11 a of the first discharge electrode 11 is connected to the connection conductor 38 by the through-hole conductor 34. The connection conductor 38 is connected to the external electrode 5 by the through-hole conductor 35. Thereby, the first discharge electrode 11 is electrically connected to the external electrode 5.

  The second discharge electrode 12 has an end portion 12 a and a second side surface portion 12 b extending in the longitudinal direction of the insulator layer 10. The end 12 a of the second discharge electrode 12 is connected to the connection conductor 39 by the through-hole conductor 36. The connection conductor 39 is connected to the external electrode 6 by the through-hole conductor 37. Thereby, the second discharge electrode 12 is electrically connected to the external electrode 6.

  As described above, since the external electrode 5 and the external electrode 7 are connected and the external electrode 6 and the external electrode 8 are connected, the ESD suppressor SP1 is electrically connected to the external electrode 7 through the external electrode 5. It is connected and electrically connected to the external electrode 8 through the external electrode 6. Therefore, the ESD suppressor SP1 and the coil L1 are connected in parallel between the external electrode 7 and the external electrode 8.

  The first discharge electrode 11 and the second discharge electrode 12 have a first side surface portion 11b extending in one direction orthogonal to the stacking direction and a second side surface portion 12b extending in the one direction facing each other. So as to be spaced apart from each other. That is, they are arranged adjacent to each other in a direction (X direction in the figure) orthogonal to the longitudinal direction (Y direction in the figure) of the insulator layer 10 and are opposed to each other. Thereby, gap part GP1 is formed between the 1st side part 11b and the 2nd side part 12b (refer FIG. 3). With such a configuration, when a predetermined voltage or higher is applied to the external electrode 7 and the external electrode 8, a discharge occurs in the gap portion GP <b> 1 between the first discharge electrode 11 and the second discharge electrode 12.

  The discharge inducing portion 13 is located between the first discharge electrode 11 and the second discharge electrode 12 and the external electrode 5 and the external electrode 6. The discharge inducing portion 13 is in contact with the first discharge electrode 11 and the second discharge electrode 12 so as to connect the first side surface portion 11b and the second discharge electrode 12 of the first discharge electrode 11 to each other. That is, the discharge inducing portion 13 is formed so as to connect the mutually opposing portions of the first and second discharge electrodes 11 and 12, and generates a discharge between the first discharge electrode 11 and the second discharge electrode 12. It has a function to make it easy to do.

  The element body 4 has a cavity 14 (see FIGS. 3 and 4). The cavity portion 14 is located between the discharge inducing portion 13 and the coil L1. The surface that defines the cavity portion 14 includes a surface 13a on which the first and second discharge electrodes 11 and 12 are disposed in the discharge inducing portion 13, and a surface 14b that faces the surface 13a. The surface 13a is also a surface facing the coil L1 in the discharge inducing portion 13. The surface 14b facing the surface 13a is located between the surface 13a and the coil L1 in the stacking direction of the insulator layer 10. On the surface 13a, the 1st and 2nd discharge electrodes 11 and 12 are formed so that the 1st and 2nd side surface parts 11b and 12b which are the mutually opposing parts may be mounted.

  The surface 14b facing the surface 13a is formed larger than the surface 13a, and is formed so as to cover the entire surface 13a when viewed from the stacking direction of the insulator layer 10. That is, the cavity portion 14 is positioned so as to cover the entire discharge inducing portion 13 when viewed from the coil L1 side in the stacking direction. Since the surface defining the cavity portion 14 includes the surface 13a of the discharge inducing portion 13, the cavity portion 14 includes the first side surface portion 11b and the second side surface portion 12b located on the surface 13a, and the discharge inducing portion. It contacts the part 13. The cavity portion 14 has a function of absorbing thermal expansion of the first discharge electrode 11, the second discharge electrode 12, the insulator layer 10, and the discharge inducing portion 13 during discharge.

  Next, the material of each component will be described in detail.

  The external electrodes 5 to 8, the first discharge electrode 11, and the second discharge electrode 12 are each made of a conductive material containing Ag, Pd, Au, Pt, Cu, Ni, Al, Mo, or W. . For the external electrodes 5 to 8, an Ag / Pd alloy, an Ag / Cu alloy, an Ag / Au alloy, an Ag / Pt alloy, or the like can be used as an alloy.

The insulator layer 10 is made of Fe ₂ O ₃ , NiO, CuO, ZnO, MgO, SiO ₂ , TiO ₂ , Mn ₂ O ₃ , SrO, CaO, BaO, SnO ₂ , K ₂ O, Al ₂ O ₃ , ZrO _2. Or a single material in B ₂ O ₃ or the like. The insulator layer 10 may be made of a ceramic material in which two or more of these are mixed. The insulator layer 10 may contain glass. The insulator layer 10 preferably contains copper oxide (CuO or Cu ₂ O) in order to enable low-temperature sintering.

  Each conductor 21-24, each through-hole conductor 31-37, and each connection conductor 38 and 39 contain conductive materials, such as Ag or Pd, for example. Each conductor 21-24, each through-hole conductor 31-37, and each connection conductor 38 and 39 are comprised as a sintered compact of the electrically conductive paste containing the said conductor material.

The discharge inducing portion 13 includes Fe ₂ O ₃ , NiO, CuO, ZnO, MgO, SiO ₂ , TiO ₂ , Mn ₂ O ₃ , SrO, CaO, BaO, SnO ₂ , K ₂ O, Al ₂ O ₃ , ZrO _2. Or a single material in B ₂ O ₃ or the like. The discharge induction part 13 may be comprised including the material which mixed these 2 or more types. The discharge inducing portion 13 contains metal particles such as Ag, Pd, Au, Pt, Ag / Pd alloy, Ag / Cu alloy, Ag / Au alloy, or Ag / Pt alloy. The melting point of the metal material contained as the metal particles in the discharge inducing portion 13 may be higher than the melting point of the conductor material contained in each of the conductors 21 to 24 constituting the coil L1. The discharge inducing part 13 preferably contains semiconductor particles such as RuO ₂ . The discharge inducing portion 13 may contain glass or lead oxide (SnO or SnO ₂ ).

  Next, with reference to FIG. 5, the manufacturing method of the electrostatic protection component in this embodiment is demonstrated. FIG. 5 is a flowchart showing a method for manufacturing the electrostatic protection component according to the present embodiment.

  First, the slurry of the material which comprises the insulator layer 10 is prepared (S1), and the green sheet for the insulator layers 10 is formed (S2). Specifically, a predetermined amount of dielectric powder containing copper oxide (CuO) and an organic vehicle containing an organic solvent and an organic binder are mixed to prepare a slurry for the insulator layer 10. As the dielectric powder, a dielectric material containing, as a main component, an oxide of Mg, Cu, Zn, Si, or Sr (may be another dielectric material) can be used. Then, a slurry is apply | coated on PET film by the doctor blade method etc., and a green sheet about 20 micrometers thick is formed. Note that through holes are formed by laser processing at the formation positions of the through-hole conductors 31 to 37 in each insulator layer 10.

After the green sheet for the insulator layer 10 is formed, the discharge inducing material slurry, the conductor paste, and the solvent (cavity lacquer) are respectively printed at predetermined positions on the green sheet (S3). Printing of the discharge inducing material slurry is performed by preparing and applying a discharge inducing material slurry for forming the discharge inducing portion 13 after firing on the sheet for the insulator layer 10 (S3A). Specifically, tin oxide, insulator, and conductor powders weighed to a predetermined amount are mixed with an organic vehicle containing an organic solvent and an organic binder to prepare a discharge inducing material slurry. For example, industrial SnO ₂ can be used as tin oxide, and dielectric powder can be used as an insulator. As the dielectric powder, a dielectric material containing, as a main component, an oxide of Mg, Cu, Zn, Si, or Sr (may be another dielectric material) can be used. Ag / Pd powder can be used as the conductor powder (Ag, Pd, Au, Pt, or a mixture or compound thereof may be used). Each powder is sufficiently mixed so that tin oxide particles and Ag / Pd alloy metal particles are mixed. The discharge inducing material slurry becomes the discharge inducing portion 13 by a firing process described later.

  The conductor paste is printed by applying a conductor paste for forming a conductor pattern to the green sheet for the insulator layer 10 by screen printing or the like (S3B). The conductor pattern becomes the conductors 21 to 24, the first and second discharge electrodes 11 and 12, the connection conductors 38 and 39, and the external electrodes 5 and 6 by a baking process described later. Each conductor pattern is formed by drying after screen printing. The through-hole is filled with a conductor paste when each conductor pattern is formed. The conductor paste filled in the through-holes becomes the through-hole conductors 31 to 37 by a firing process described later.

  The lacquer for cavity is printed on the green sheet for the insulator layer 10 with the discharge inducing material slurry already printed, and the first and second side portions of the first and second discharge electrodes 11 and 12 which are also already printed. This is performed by applying a cavity lacquer so as to cover the conductor paste for forming 11b and 12b (S3C). The cavity lacquer is a paint for forming the cavity 14.

  The green sheet for the insulator layer 10 printed with the discharge inducing material slurry, the conductor paste, and the cavity lacquer is sequentially laminated (S4), pressed (S5), and becomes the size of each electrostatic protection component 1. In this manner, the laminate is cut (S6). The order of stacking the green sheets for the insulator layer 10 is that the order in the stacking direction of each component formed after firing is the external electrode 5 in order from the side closer to the side surface 4c of the element body 4 that is the mounting surface with respect to the circuit board. 6, the connection conductors 38 and 39, the discharge inducing portion 13, the first and second discharge electrodes 11 and 12, the cavity portion 14, and the conductors 21 to 24.

  Subsequently, barrel polishing of each green chip obtained by cutting the green sheet laminate for the insulator layer 10 is performed (S7). Thereby, the green chip | tip with which the corner | angular part and the ridgeline were rounded is obtained.

  Next, after the barrel polishing step, the green chip is fired under predetermined conditions (for example, in the air at 850 to 950 ° C. for 2 hours) (S8). Thereby, the green chip becomes the element body 4 by firing. In the firing step, the cavity lacquer disappears. Thereby, the cavity part 14 which covers the side part 11b, 12b of the 1st and 2nd discharge electrodes 11 and 12 and the whole surface 13a facing the coil L1 of the discharge induction part 13 is formed. As a result, the ESD suppressor SP1 including the first discharge electrode 11, the second discharge electrode 12, the discharge inducing portion 13, and the cavity portion 14 is formed in the element body 4. That is, the intermediate body provided with the element body 4 in which the ESD suppressor SP1 and the coil L1 are disposed inside and the external electrodes 5 and 6 disposed on the outer surface of the element body 4 by passing through the firing step. The body is obtained. At this time, the cavity portion 14 included in the ESD suppressor SP1 is formed between the discharge inducing portion 13 and the coil L1 on the surface 13a facing the coil L1 of the discharge inducing portion 13 when viewed from the stacking direction of the insulator layer 10. It is formed so as to cover the whole.

  Subsequently, the characteristics of the ESD suppressor SP1 are measured (S9). Here, a probe is brought into contact with each of the external electrodes 5 and 6 of the obtained intermediate, and the characteristics of the ESD suppressor SP1 are measured. As characteristics of the ESD suppressor SP1, electrical characteristics such as capacitance and insulation resistance of the ESD suppressor SP1 are measured. At this time, since the external electrode 5 is electrically connected to the first discharge electrode 11 and the external electrode 6 is electrically connected to the second discharge electrode 12, the probe is brought into contact with the external electrode 5 and the external electrode 6. Thus, the characteristics of the ESD suppressor SP1 can be measured.

Subsequently, a conductive paste for each of the external electrodes 7 and 8 is applied to the element body 4 (S10), and heat treatment is performed under a predetermined condition (for example, 600 to 800 ° C. for 2 hours in the atmosphere). , 8 are formed by baking (S11). At this time, the external electrode 7 is formed so as to be connected to one end E1 ₁ (the end 24a of the conductor 24) of the coil L1 and the external electrode 5, and the external electrode 8 is connected to the other end E1 _{2 of the} coil L1 (the end of the conductor 21). 21a) and the external electrode 6 are formed.

  Then, the characteristic inspection about the electrostatic protection component 1 is performed (S12). In particular, the characteristics of the coil L1 are measured. Since both ends of the coil L1 are connected to the external electrodes 7 and 8, characteristics such as direct current resistance of the coil L1 can be measured by bringing a probe into contact with the external electrodes 7 and 8. Thereafter, the surfaces of the external electrodes 7 and 8 are plated (S13). The plating is preferably electrolytic plating. For example, Ni / Sn, Cu / Ni / Sn, Ni / Pd / Au, Ni / Pd / Ag, Ni / Ag, or the like can be used.

  Through the above process, the electrostatic protection component 1 is obtained.

  As described above, in this embodiment, the cavity portion 14 is in contact with the gap portion GP1 and the discharge inducing portion 13 of the first and second discharge electrodes 11 and 12. Thereby, the discharge in gap part GP1 in the 1st and 2nd discharge electrodes 11 and 12 will arise appropriately, and desired ESD absorption performance can be ensured easily.

  The cavity portion 14 is further positioned so as to cover the entire discharge inducing portion 13 when viewed in the stacking direction from the coil L1 side. That is, the hollow portion 14 is located between the coil L1 (inner conductors 21 to 24) and the discharge inducing portion 13. The cavity 14 is usually formed by the disappearance of a material such as a resin in the process of performing the heat treatment for obtaining the element body 4. Since the temperature at which the material for forming the cavity 14 disappears is lower than the material constituting the inner conductors 21 to 24, the cavity is reached until the material constituting the inner conductors 21 to 24 can diffuse. A portion 14 is formed. Therefore, even if the material constituting the inner conductors 21 to 24 can be diffused, the cavity portion 14 is located between the coil L1 (inner conductors 21 to 24) and the discharge inducing portion 13, so that the cavity The portion 14 suppresses the material constituting the inner conductors 21 to 24 from diffusing into the discharge inducing portion 13. As a result, changes in the characteristics of the discharge inducing portion 13 can be suppressed.

  The cavity portion 14 is located so as to cover the entire discharge inducing portion 13 when viewed in the stacking direction from the coil L1 side. That is, the cavity 14 having a lower dielectric constant than that of the discharge inducing portion 13 is located between the coil L1 (inner conductors 21 to 24) and the discharge inducing portion 13. For this reason, even if the discharge inducing portion 13 contains metal particles and the dielectric constant is high, the cavity portion 14 having a lower dielectric constant than the discharge inducing portion 13 is discharged from the coil L1 (internal conductors 21 to 24). Since it is located between the induction part 13, the parasitic capacitance generated due to the dielectric constant of the discharge induction part 13 is reduced by the cavity part 14. As a result, the parasitic capacitance generated between the coil L1 and the ESD suppressor SP1 can be reduced.

  The melting point of the material constituting the inner conductors 21 to 24 may be lower than the melting point of the material constituting the metal particles. When the melting point of the material constituting the inner conductors 21 to 24 is lower than that of the metal particles, the material constituting the inner conductors 21 to 24 is likely to diffuse. However, since the cavity portion 14 is positioned so as to cover the entire discharge inducing portion 13 when viewed from the coil L1 side in the stacking direction, the material constituting the inner conductors 21 to 24 is relatively easily diffused. Even in the state, it is possible to reliably suppress the material constituting the inner conductors 21 to 24 from reaching the discharge inducing portion 13.

  The first discharge electrode 11 has a first side surface portion 11 b extending in the longitudinal direction of the insulator layer 10, and the second discharge electrode 12 is a second side surface portion 12 b extending in the longitudinal direction of the insulator layer 10. The first and second discharge electrodes 11 and 12 are disposed so as to be separated from each other so that the first side surface portion 11b and the second side surface portion 12b face each other. Therefore, in the 1st discharge electrode 11, the 1st side part 11b which opposes the 2nd side part 12b turns into an area | region which can discharge, and in the 2nd discharge electrode 12, the 2nd side part 12b which opposes the 1st side part 11b It becomes a dischargeable area. In the configuration in which the first and second discharge electrodes 11 and 12 are arranged so that the first and second side surface portions 11b and 12b face each other, the end portions 11a and 12a of the first and second discharge electrodes 11 and 12 are connected to each other. Compared to the configuration in which the first and second discharge electrodes 11 and 12 are arranged so that the electrodes face each other, it is possible to set a longer dischargeable region. The longer the dischargeable area, the more durable the electrostatic protection component 1 is.

(Second Embodiment)
Next, the configuration of the electrostatic protection component 2 according to the second embodiment will be described with reference to FIGS. FIG. 6 is a perspective view showing the electrostatic protection component according to the second and third embodiments. FIG. 7 is an exploded perspective view showing the configuration of the element body according to the second embodiment. FIG. 8 is a diagram illustrating a cross-sectional configuration of the electrostatic protection component according to the second embodiment including the first ESD suppressor and the third ESD suppressor. FIG. 9 is a diagram illustrating a cross-sectional configuration of the electrostatic protection component according to the second embodiment including the second ESD suppressor and the fourth ESD suppressor. FIG. 10 is a diagram illustrating a cross-sectional configuration of the electrostatic protection component according to the second embodiment including the first ESD suppressor and the fourth ESD suppressor.

As shown in FIGS. 6 to 10, the electrostatic protection component 2 according to the present embodiment includes an element body 4, an external electrode 41, an external electrode 42, an external electrode 43, and an external electrode disposed on the outer surface of the element body 4. electrode 44, and the external electrode 45 and external electrode 46, a first coil L2 ₁ and the second coil L2 ₂ arranged inside the element body 4, the 1ESD with ESD absorption capability which is arranged inside the element body 4 A suppressor SP2 ₁ , a second ESD suppressor SP2 ₂ , a third ESD suppressor SP2 ₃ and a fourth ESD suppressor SP2 ₄ are provided.

  The external electrode 41 covers a part of the end face 4a of the element body 4, and is formed so that a part of the external electrode 41 wraps around the side face 4c and the side face 4d adjacent to the end face 4a. The external electrode 42 is formed so as to cover a part of the end surface 4b of the element body 4 and a part of the external electrode 42 wraps around the side surface 4c and the side surface 4d adjacent to the end surface 4b.

  The external electrode 43 and the external electrode 44 are disposed at both end positions in the longitudinal direction (Y direction in the drawing) of the side surface 4e adjacent to the end surface 4a of the element body 4. The external electrode 43 and the external electrode 44 are formed so that a part thereof wraps around the side surface 4 c and the side surface 4 d adjacent to the side surface 4 e of the element body 4.

  The external electrode 45 and the external electrode 46 are disposed at both end positions in the longitudinal direction of the side surface 4 f adjacent to the end surface 4 a of the element body 4. The external electrode 45 and the external electrode 46 are formed so that a part thereof wraps around the side surface 4 c and the side surface 4 d adjacent to the side surface 4 f of the element body 4.

The first coil L2 ₁ and the second coil L2 ₂ are juxtaposed in the order of the first coil L2 ₁ and the second coil L2 ₂ from the side closer to the side surface 4d of the element body 4 in the stacking direction of the insulator layer 10. . The first coil L2 _1, the end portions of the plurality of conductors 51 and conductors 52 are internal conductors juxtaposed in the laminating direction of the insulator layers 10 inside the body 4, positioned between the conductor 51 and the conductor 52 The through-hole conductors 15 are connected to each other. The conductor 51 has a spiral shape. The conductor 51 and the conductor 52 are juxtaposed in the order of the conductor 51 and the conductor 52 from the side close to the side surface 4 c of the element body 4 in the stacking direction of the insulator layer 10.

The end portion 51 a of the conductor 51 is drawn to the side surface 4 e of the element body 4, is exposed to the side surface 4 e, and is connected to the external electrode 43. The end 52a of the conductor 52 is drawn to the side surface 4f of the element body 4, is exposed to the side surface 4f, and is connected to the external electrode 45. An end portion 51a of the conductor 51 corresponds to one end E2 ₁ of the first coil L2 ₁ , and an end portion 52a of the conductor 52 corresponds to the other end E2 ₂ of the first coil L2 ₁ . Thus, the first coil L2 ₁ is electrically connected to the external electrodes 43 and 45.

The second coil L2 _2, the end portions of the plurality of conductors 53 and conductors 54 are internal conductors juxtaposed in the laminating direction of the insulator layers 10 inside the body 4, positioned between the conductor 53 and conductors 54 The through-hole conductors 16 are connected to each other. The conductor 54 has a spiral shape. The conductor 53 and the conductor 54 are juxtaposed in the order of the conductor 53 and the conductor 54 from the side closer to the side surface 4d of the element body 4 in the stacking direction of the insulator layer 10.

The end 53a of the conductor 53 is drawn to the side surface 4e of the element body 4, is exposed to the side surface 4e, and is connected to the external electrode 44. The end portion 54 a of the conductor 54 is drawn to the side surface 4 f of the element body 4, is exposed to the side surface 4 f, and is connected to the external electrode 46. End 53a of the conductor 53 corresponds to the second end E2 ₃ of the coil L2 _2, the ends 54a of the conductor 54 corresponds to the second other end E2 ₄ of the coil L2 _2. Therefore, the second coil L2 ₂ is electrically connected to the external electrodes 44 and 46.

The first coil L2 ₁ and the second coil L2 ₂ constitute a so-called common mode filter by magnetically coupling the conductor 52 and the conductor 54 having a spiral shape.

The 1ESD suppressor SP2 ₁ and the second 2ESD suppressor SP2 _2, disposed on the same insulator layer 10, in the laminating direction of the insulator layers 10, located closer to the side surface 4d of the body 4 than the second coil L2 ₂ Is formed. The 1ESD suppressor SP2 ₁ comprises a first discharge electrode 61 and the second discharge electrode 62 which are spaced apart from each other on the same insulator layer 10, is connected to the first discharge electrode 61 and the second discharge electrode 62 and discharge The induction part 63 and the cavity part 64 which covers the discharge induction part 63 are comprised.

The first discharge electrode 61 has an L shape extending in the short side direction and the long side direction of the insulator layer 10. The first discharge electrode 61 extends in the short direction of the insulator layer 10 and has an end 61a. The end portion 61 a is pulled out to the side surface 4 e of the element body 4, is exposed to the side surface 4 e, and is connected to the external electrode 43. That is, the first discharge electrode 61, through the external electrode 43 is electrically connected to one end E2 ₁ of the first coil L2 _1. The first discharge electrode 61 has a first side surface 61 b that extends in the longitudinal direction of the insulator layer 10 and faces the second discharge electrode 62.

  The second discharge electrode 62 extends in the longitudinal direction of the insulator layer 10, and includes an end 62 a and a second side surface 62 b that faces the first side surface 61 b of the first discharge electrode 61. . The end 62 a is drawn to the end surface 4 a of the element body 4, is exposed to the end surface 4 a, and is connected to the external electrode 41.

The first discharge electrode 61 and the second discharge electrode 62 are opposed to each other by a first side surface portion 61b extending in one direction orthogonal to the stacking direction and a second side surface portion 62b extending in the one direction. So as to be spaced apart from each other. Thereby, the gap portion GP2 ₁ is formed between the first side surface portion 61b and the second side surface portion 62b (see FIG. 8). With such a configuration, the gap portion GP2 ₁ between a predetermined higher voltage is applied between the external electrode 41 and external electrode 43, a first discharge electrode 61 and the second discharge electrode 62, discharge occurs .

  The discharge inducing portion 63 is located between the first discharge electrode 61 and the second discharge electrode 62 and the side surface 4 d of the element body 4. The discharge inducing portion 63 is in contact with the first discharge electrode 61 and the second discharge electrode 62 so as to connect the first side surface portion 61 b of the first discharge electrode 61 and the second side surface portion 62 b of the second discharge electrode 62. That is, the discharge inducing portion 63 is formed so as to connect the mutually opposing portions of the first and second discharge electrodes 61 and 62, and generates a discharge between the first discharge electrode 61 and the second discharge electrode 62. It has a function to make it easy to do.

The element body 4 has a cavity 64 (see FIGS. 8 and 10). Cavity 64 is positioned between the discharge inducing portion 63 and the second coil L2 _2. The surface defining the cavity portion 64 includes a surface 63a on which the first and second discharge electrodes 61 and 62 are disposed in the discharge inducing portion 63, and a surface 64b facing the surface 63a. The surface 63a is also a surface facing the second coil L22 ₂ in the discharge inducing portion 63. The surface 64b facing the surface 63a is located between the surface 63a and the second coil L22 ₂ in the stacking direction of the insulator layer 10. On the surface 63a, the first and second discharge electrodes 61, 62 are formed so that the first and second side surface portions 61b, 62b, which are portions facing each other, are placed thereon.

The surface 64b facing the surface 63a is formed larger than the surface 63a, and is formed so as to cover the entire surface 63a when viewed from the stacking direction of the insulator layer 10. That is, the cavity 64, as viewed in the stacking direction from the second coil L2 ₂ side are positioned so as to cover the entire discharge inducing portion 63. Since the surface defining the cavity 64 includes the surface 63a of the discharge inducing portion 63, the cavity 64 includes the first side surface portion 61b and the second side surface portion 62b positioned on the surface 63a, and the discharge inducing portion. It contacts the part 63. The cavity 64 has a function of absorbing thermal expansion of the first discharge electrode 61, the second discharge electrode 62, the insulator layer 10, and the discharge inducing portion 63 during discharge.

The 2ESD suppressor SP2 ₂ is connected to the first discharge electrode 65 which are spaced apart from each other on the same insulating layer 10 and the second discharge electrode 62, a first discharge electrode 65 and the second discharge electrode 62 and discharge The induction part 66 and the cavity part 67 which covers the discharge induction part 66 are comprised.

The first discharge electrode 65 has an L shape extending in the short side direction and the long side direction of the insulator layer 10. The first discharge electrode 65 extends in the short direction of the insulator layer 10 and has an end portion 65a. The end portion 65 a is pulled out to the side surface 4 f of the element body 4, is exposed to the side surface 4 f, and is connected to the external electrode 46. That is, the first discharge electrode 65, through the external electrode 46 is electrically connected to the second other end E2 ₄ of the coil L2 _2. The first discharge electrode 65 has a first side surface portion 65 b extending in the longitudinal direction of the insulator layer 10 and facing the second discharge electrode 62.

  The second discharge electrode 62 extends in the longitudinal direction of the insulator layer 10, and has an end portion 62 c and a second side surface portion 62 d facing the first side surface portion 65 b of the first discharge electrode 65. . The end portion 62 c is drawn to the end surface 4 b of the element body 4, is exposed to the end surface 4 b, and is connected to the external electrode 42.

The first discharge electrode 65 and the second discharge electrode 62 are opposed to each other by a first side surface portion 65b extending in one direction orthogonal to the stacking direction and a second side surface portion 62d extending in the one direction. So as to be spaced apart from each other. Accordingly, gap GP2 ₂ is formed between the first side surface portion 65b and the second side surface portion 62d (see FIG. 9). With this configuration, when a predetermined or more voltage is applied between the external electrode 42 and external electrode 46, the gap GP2 ₂ between the first discharge electrode 65 and the second discharge electrode 62, discharge occurs .

  The discharge inducing portion 66 is located between the first discharge electrode 65 and the second discharge electrode 62 and the side surface 4 d of the element body 4. The discharge inducing portion 66 is in contact with the first discharge electrode 65 and the second discharge electrode 62 so as to connect the first side surface portion 65 b of the first discharge electrode 65 and the second side surface portion 62 d of the second discharge electrode 62. In other words, the discharge inducing portion 66 is formed so as to connect the opposing portions of the first and second discharge electrodes 65 and 66 to generate a discharge between the first discharge electrode 65 and the second discharge electrode 62. It has a function to make it easy to do.

The element body 4 has a cavity 67 (see FIG. 9). Cavity 67 is positioned between the discharge inducing portion 66 and the second coil L2 _2. The surface that defines the cavity 67 includes a surface 66a on which the first and second discharge electrodes 65 and 62 are disposed in the discharge inducing portion 66, and a surface 67b that faces the surface 66a. The surface 66a is also a surface facing the second coil L22 ₂ in the discharge inducing portion 66. The surface 67b facing the surface 66a is located between the surface 66a and the second coil L22 ₂ in the stacking direction of the insulator layer 10. On the surface 66a, the first and second discharge electrodes 65 and 62 are formed so that the first and second side surface portions 65b and 62d, which are portions facing each other, are placed thereon.

The surface 67b facing the surface 66a is formed to be larger than the surface 66a, and is formed so as to cover the entire surface 66a when viewed from the stacking direction of the insulator layer 10. That is, the cavity portion 67, as viewed in the stacking direction from the second coil L2 ₂ side are positioned so as to cover the entire discharge inducing portion 66. Since the surface defining the cavity 67 includes the surface 66a of the discharge inducing portion 66, the cavity 67 includes the first side surface portion 65b and the second side surface portion 62d located on the surface 66a, and the discharge inducing region. It contacts the part 66. The cavity portion 67 has a function of absorbing thermal expansion of the first discharge electrode 65, the second discharge electrode 62, the insulator layer 10, and the discharge inducing portion 66 during discharge.

And the 3ESD suppressor SP2 ₃ is a first 4ESD suppressor SP2 _4, are disposed on the same insulator layer 10, in the laminating direction of the insulator layers 10, located closer to the side surface 4c of the body 4 than the first coil L2 ₁ Is formed. The 3ESD suppressor SP2 ₃ includes a first discharge electrode 68 and the second discharge electrode 69 which are spaced apart from each other on the same insulator layer 10, is connected to the first discharge electrode 68 and the second discharge electrode 69 and discharge The induction part 70 and the cavity part 71 which covers the discharge induction part 70 are comprised.

The first discharge electrode 68 has an L shape extending in the short side direction and the long side direction of the insulator layer 10. The first discharge electrode 68 extends in the short direction of the insulator layer 10 and has an end 68a. The end portion 68 a is pulled out to the side surface 4 f of the element body 4, is exposed to the side surface 4 f, and is connected to the external electrode 45. That is, the first discharge electrode 68 through the external electrode 45 is electrically connected to the other end E2 ₂ of the first coil L2 _1. The first discharge electrode 68 has a first side surface 68 b that extends in the longitudinal direction of the insulator layer 10 and faces the second discharge electrode 69.

  The second discharge electrode 69 extends in the longitudinal direction of the insulator layer 10, and has an end portion 69 a and a second side surface portion 69 b facing the side surface portion 68 b of the first discharge electrode 68. The end portion 69 a is pulled out to the end surface 4 a of the element body 4, is exposed to the end surface 4 a, and is connected to the external electrode 41.

The first discharge electrode 68 and the second discharge electrode 69 have a first side surface portion 68b extending in one direction orthogonal to the stacking direction and a second side surface portion 69d extending in the one direction facing each other. So as to be spaced apart from each other. Thereby, the gap portion GP2 ₃ is formed between the first side surface portion 68b and the second side surface portion 69b (see FIG. 8). With this configuration, when a predetermined voltage higher than between the external electrodes 41 and the external electrode 45 is applied, the gap portion GP2 ₃ between the first discharge electrode 68 and the second discharge electrode 69, discharge occurs .

  The discharge inducing portion 70 is located between the first discharge electrode 68 and the second discharge electrode 69 and the side surface 4 c of the element body 4. The discharge inducing portion 70 is in contact with the first discharge electrode 68 and the second discharge electrode 69 so that the first side surface portion 68b of the first discharge electrode 68 and the second side surface portion 69b of the second discharge electrode 69 are connected to each other. That is, the discharge inducing portion 70 is formed so as to connect the mutually opposing portions of the first and second discharge electrodes 68 and 69, and generates a discharge between the first discharge electrode 68 and the second discharge electrode 69. It has a function to make it easy to do.

The element body 4 has a cavity 71 (see FIG. 8). Cavity 71 is located between the discharge inducing portion 70 and the first coil L2 _1. The surface that defines the cavity portion 71 includes a surface 70a on which the first and second discharge electrodes 68 and 69 are disposed in the discharge inducing portion 70, and a surface 71b that faces the surface 70a. Surface 70a is also the first coil L2 ₁ and the surface facing the discharge inducing section 70. The surface 71b facing the surface 70a is located between the surface 70a and the first coil L21 ₁ in the stacking direction of the insulator layer 10. On the surface 70a, the first and second discharge electrodes 68 and 69 are formed so that the first and second side surface portions 68b and 69b, which are portions facing each other, are placed thereon.

The surface 71b facing the surface 70a is formed to be larger than the surface 70a, and is formed so as to cover the entire surface 70a when viewed from the stacking direction of the insulator layer 10. That is, the cavity 71, as viewed in the stacking direction from the first coil L2 ₁ side is positioned so as to cover the entire discharge inducing portion 70. Since the surface that defines the cavity 71 includes the surface 70a of the discharge inducing portion 70 and the surface 71b that faces the surface 70a, the cavity 71 is a first side surface portion 68b that is located on the surface 70a. The second side surface portion 69b and the discharge inducing portion 70 are in contact with each other. The cavity 71 has a function of absorbing thermal expansion of the first discharge electrode 68, the second discharge electrode 69, the insulator layer 10, and the discharge inducing portion 70 during discharge.

The 4ESD suppressor SP2 ₄ is connected to the first discharge electrode 72 which are spaced apart from each other on the same insulating layer 10 and the second discharge electrode 69, a first discharge electrode 72 and the second discharge electrode 69 and discharge The induction part 73 and the cavity part 74 which covers the discharge induction part 73 are comprised.

The first discharge electrode 72 has an L shape extending in the short side direction and the long side direction of the insulator layer 10. The first discharge electrode 72 extends in the short direction of the insulator layer 10 and has an end portion 72a. The end portion 72 a is pulled out to the side surface 4 e of the element body 4, is exposed to the side surface 4 e, and is connected to the external electrode 44. That is, the first discharge electrode 72 is electrically connected to the one end E2 ₃ of the second coil L22 ₂ through the external electrode 44. The first discharge electrode 72 has a first side surface portion 72 b extending in the longitudinal direction of the insulator layer 10 and facing the second discharge electrode 69.

  The second discharge electrode 69 extends in the longitudinal direction of the insulator layer 10 and has an end portion 69 c and a second side surface portion 69 d facing the first side surface portion 72 b of the first discharge electrode 72. . The end portion 69 c is pulled out to the end surface 4 b of the element body 4, is exposed to the end surface 4 b, and is connected to the external electrode 42.

The first discharge electrode 72 and the second discharge electrode 69 have a first side surface portion 72b extending in one direction orthogonal to the stacking direction and a second side surface portion 69d extending in the one direction facing each other. So as to be spaced apart from each other. Thereby, the gap portion GP2 ₄ is formed between the first side surface portion 72b and the second side surface portion 69d (see FIG. 9). With this configuration, when a voltage higher than a predetermined between the external electrode 42 and external electrode 44 is applied, the gap GP2 ₄ between the first discharge electrode 72 and the second discharge electrode 69, discharge occurs .

  The discharge inducing portion 73 is located between the first discharge electrode 72 and the second discharge electrode 69 and the side surface 4 c of the element body 4. The discharge inducing portion 73 is in contact with the first discharge electrode 72 and the second discharge electrode 69 so as to connect the first side surface portion 72 b of the first discharge electrode 72 and the second side surface portion 69 d of the second discharge electrode 69. That is, the discharge inducing portion 73 is formed so as to connect the mutually opposing portions of the first and second discharge electrodes 72 and 69, and generates a discharge between the first discharge electrode 72 and the second discharge electrode 69. It has a function to make it easy to do.

The element body 4 has a cavity 74 (see FIGS. 9 and 10). Cavity 74 is positioned between the discharge inducing portion 73 and the first coil L2 _1. The surface that defines the cavity portion 74 includes a surface 73a on which the first and second discharge electrodes 72 and 69 are disposed in the discharge inducing portion 73, and a surface 74b that faces the surface 73a. Surface 73a is also the first coil L2 ₁ and the surface facing the discharge inducing section 73. Face 74b facing the surface 73a is positioned between the surface 73a and the first coil L2 ₁ in the laminating direction of the insulator layer 10. On the surface 73a, the first and second discharge electrodes 72 and 69 are formed so that the first and second side surface portions 72b and 69d, which are portions facing each other, are placed thereon.

The surface 74b facing the surface 73a is formed to be larger than the surface 73a, and is formed so as to cover the entire surface 73a when viewed from the stacking direction of the insulator layer 10. That is, the cavity 74, as viewed in the stacking direction from the first coil L2 ₁ side is positioned so as to cover the entire discharge inducing portion 73. Since the surface defining the cavity portion 74 includes the surface 73a of the discharge inducing portion 73, the cavity portion 74 includes the first side surface portion 72b and the second side surface portion 69d located on the surface 73a, and the discharge inducing portion. It contacts the part 73. The cavity 74 has a function of absorbing thermal expansion of the first discharge electrode 72, the second discharge electrode 69, the insulator layer 10, and the discharge inducing portion 73 during discharge.

As described above, in the second embodiment, like the first embodiment described above, when viewed in the stacking direction from the first coil L2 ₁ side, the cavity 64 covers the whole of the discharge inducing section 63 The cavity portion 67 is positioned so as to cover the entire discharge inducing portion 66. When viewed in the stacking direction from the second coil L2 ₂ side, the cavity 71 is located so as to cover the entire discharge inducing portion 70 is positioned such that a cavity portion 74 covers the whole of the discharge inducing section 73 . Thus, each cavity 64,67,71,74 is positioned between the discharge inducing section 63,66,70,73 first coil L2 ₁ and the second coil L2 ₂ (inner conductor 51 to 54) ing. Therefore, even if the material constituting the inner conductors 51 to 54 can be diffused, the material constituting the inner conductors 51 to 54 is caused to be caused by the respective cavity portions 64, 67, 71, 74. , 70, 73 are prevented from diffusing. As a result, it is possible to suppress changes in characteristics of the respective discharge inducing portions 63, 66, 70, 73.

Each cavity 64,67,71,75 low dielectric constant than the discharge inducing section 63,66,70,73 is, each discharge a first coil L2 ₁ and the second coil L2 ₂ (inner conductor 51 to 54) It is located between the induction parts 63, 66, 70 and 73. Therefore, even if each of the discharge inducing portions 63, 66, 70, 73 contains metal particles and has a high dielectric constant, the cavity 64, 67, 71, 74 causes the dielectric constant of the discharge inducing portion 13 to be increased. The parasitic capacitance generated due to this is reduced. As a result, it is possible to reduce the parasitic capacitance generated between the first coil L2 ₁ and the 3ESD suppressor SP2 ₃ and the 4ESD suppressor SP2 _4, a second coil L2 ₂ The 1ESD suppressor SP2 ₁ and the 2ESD it is possible to reduce the parasitic capacitance generated between the suppressor SP2 _2.

(Third embodiment)
Next, the configuration of the electrostatic protection component 3 according to the third embodiment will be described with reference to FIGS. 6 and 11 to 13. FIG. 11 is an exploded perspective view illustrating a configuration of an element body included in the electrostatic protection component according to the third embodiment. FIG. 12 is a diagram illustrating a cross-sectional configuration including a first ESD suppressor and a second ESD suppressor of the electrostatic protection component according to the third embodiment. FIG. 13 is a diagram illustrating a cross-sectional configuration of the electrostatic protection component according to the third embodiment including a third ESD suppressor, a fourth ESD suppressor, and a sixth ESD suppressor. FIG. 14 is a diagram illustrating a cross-sectional configuration of the electrostatic protection component according to the third embodiment including a first ESD suppressor and a third ESD suppressor.

As shown in FIGS. 6 and 11 to 13, the electrostatic protection component 3 according to this embodiment includes an element body 4, an external electrode 41, an external electrode 42, and an external electrode disposed on the outer surface of the element body 4. 43, external electrodes 44, and the external electrode 45 and external electrode 46, a first coil L3 ₁ placed inside the element body 4, a second coil L3 _2, ESD-absorbing ability, which is arranged inside the element body 4 the 1ESD suppressor SP3 ₁ having the first 2ESD suppressor SP3 _2, and the 3ESD suppressor SP3 _3, and the 4ESD suppressor SP3 _4, first capacitor C3 ₁ disposed inside the element body 4, a second capacitor C3 _2, the 3 capacitors C3 ₃ and a fourth capacitor C3 ₄ are provided. The configurations of the element body 4 and the external electrodes 41 to 46 are the same as those of the electrostatic protection component 2 according to the second embodiment.

The first coil L3 ₁ and the second coil L3 ₂ are arranged in the stacking direction of the insulator layer 10 in the first to fourth ESD suppressors SP3 ₁ , SP3 ₂ , SP3 ₃ , SP3 ₄ and the first to fourth capacitors C3 ₁ , C3 ₂ , C3 ₃ , and C3 ₄ are formed. The first coil L3 ₁ has a plurality of conductors 75 ₁ , conductor 76 ₁ , conductor 77 _1, and conductor 78 ₁ which are a plurality of internal conductors juxtaposed in the stacking direction of the insulator layer 10 inside the element body 4. The through-hole conductors 79 _{1 to} 81 ₁ located between the conductors 75 _{1 to} 78 ₁ are connected to each other. The conductors 75 _{1 to} 78 ₁ are arranged in the order of the conductor 75 ₁ , the conductor 76 ₁ , the conductor 77 ₁ , and the conductor 78 ₁ from the side close to the side surface 4c of the element body 4 in the stacking direction of the insulator layer 10. Yes.

Through-hole conductors 79 ₁ is located between the conductor 75 ₁ and the conductor 76 _1, to electrically connect the conductor 75 ₁ and the conductor 76 _1. Through-hole conductors 80 ₁ is located between the conductor 76 ₁ and the conductor 77 _1, to electrically connect the conductor 76 ₁ and the conductor 77 _1. Through-hole conductors 81 ₁ is located between the conductor 77 ₁ and the conductor 78 _1, to electrically connect the conductor 77 ₁ and the conductor 78 _1. Each through-hole conductor 79 _{1 to} 81 ₁ functions as a part of the first coil L 3 ₁ .

Ends 78a ₁ of the conductor 78 ₁ is drawn to the side surface 4e of the element body 4 is exposed to the side surface 4e, is connected to the external electrode 43. Ends 75a ₁ of the conductor 75 ₁ is drawn to the side face 4f of the element body 4 is exposed to the side surface 4f, is connected to the external electrode 45. It ends 78a ₁ of the conductor 78 ₁ corresponds to one end E3 ₁ of the first coil L3 _1, the end portion 75a ₁ of the conductor 75 ₁ corresponds to the other end E3 ₂ of the first coil L3 _1. Thus, the first coil L3 ₁ is electrically connected to the external electrodes 43 and 45.

The second coil L3 ₂ has the ends of the conductors 75 ₂ , conductors 76 ₂ , conductors 77 _2, and conductors 78 ₂ that are a plurality of internal conductors juxtaposed in the stacking direction of the insulator layer 10 inside the element body 4. , and it is configured by being connected by the through-hole conductors ₇₉ 2-81 ₂ located between the conductors ₇₅ 2-78 _2. The conductors 75 _{2 to} 78 ₂ are arranged on the same insulator layer 10 as the conductors 75 _{1 to} 78 ₁ , respectively. That is, the conductors 75 _{2 to} 78 ₂ are juxtaposed in the order of the conductor 75 ₂ , the conductor 76 ₂ , the conductor 77 ₂ , and the conductor 78 ₂ from the side close to the side surface 4c of the element body 4 in the stacking direction of the insulator layer 10. Has been.

Through-hole conductors 79 ₂ is disposed between the conductor 75 ₂ and the conductor ₇₆₂ electrically connects the conductor 75 ₂ and the conductor 76 _2. Through-hole conductors 80 ₂ is disposed between the conductor ₇₆₂ and the conductor 77 _2, to electrically connect the conductor ₇₆₂ and the conductor 77 _2. Through-hole conductors 81 ₂ is disposed between the conductor 77 ₂ and the conductor 78 _2, to electrically connect the conductor 77 ₂ and the conductor 78 _2. Each through-hole conductors ₇₉ 2-81 ₂ functions as a second part of the coil L3 _2.

End 78a ₂ of the conductor 78 ₂ is drawn to the side surface 4e of the element body 4 is exposed to the side surface 4e, is connected to the external electrode 44. End 75a ₂ of the conductor 75 ₂ is drawn to the side face 4f of the element body 4 is exposed to the side surface 4f, is connected to the external electrode 46. End 78a of the conductor 78 _{2 2} corresponds to the second end E3 ₃ of the coil L3 _2, the ends 75a ₂ of the conductors 75 ₂ corresponds to the second coil L3 ₂ of the other end E3 _4. Therefore, the second coil L < _b > 32 is electrically connected to the external electrodes 44 and 46.

The first ESD suppressor SP3 ₁ , the second ESD suppressor SP3 ₂ , the third ESD suppressor SP3 ₃ , and the fourth ESD suppressor SP3 ₄ are disposed on the same insulator layer 10, and the first coil L 3 is arranged in the stacking direction of the insulator layer 10. than ₁ and a second coil L3 ₂ is formed at a position closer to the side surface 4d of the body 4. The first ESD suppressor SP3 ₁ connects the first discharge electrode 82 and the second discharge electrode 84, which are spaced apart from each other in the same insulator layer 10, and the first discharge electrode 82 and the second discharge electrode 84. A discharge inducing portion 85 and a hollow portion 86 covering the discharge inducing portion 85 are configured. The second ESD suppressor SP3 ₂ connects the first discharge electrode 83 and the second discharge electrode 84, which are spaced apart from each other in the same insulator layer 10, and the first discharge electrode 83 and the second discharge electrode 84. A discharge inducing portion 85 and a hollow portion 86 covering the discharge inducing portion 85 are configured.

The first discharge electrode 82 has an L shape extending in the short side direction and the long side direction of the insulator layer 10. The first discharge electrode 82 extends in the short direction of the insulator layer 10 and has an end 82a. The end 82 a is pulled out to the side surface 4 e of the element body 4, is exposed to the side surface 4 e, and is connected to the external electrode 43. That is, the first discharge electrode 82 through the external electrode 43 is electrically connected to one end E3 ₁ of the first coil L3 _1. The first discharge electrode 82 has a first side surface portion 82 b that extends in the longitudinal direction of the insulator layer 10 and faces the second discharge electrode 84.

The first discharge electrode 83 has an L shape extending in the short side direction and the long side direction of the insulator layer 10. The first discharge electrode 83 extends in the short direction of the insulator layer 10 and has an end 83a. The end 83a is drawn to the side surface 4f of the element body 4, is exposed to the side surface 4f, and is connected to the external electrode 45. That is, the first discharge electrode 83, through the external electrode 45 is electrically connected to the other end E3 ₂ of the first coil L3 _1. The first discharge electrode 83 has a first side surface portion 83 b that extends in the longitudinal direction of the insulator layer 10 and faces the second discharge electrode 84.

  The second discharge electrode 84 extends in the longitudinal direction of the insulator layer 10, and includes an end portion 84 a and a side surface portion 84 b that faces the first side surface portions 82 b and 83 b of the first discharge electrodes 82 and 83. Have. The end portion 84 a is pulled out to the end surface 4 a of the element body 4, is exposed to the end surface 4 a, and is connected to the external electrode 41.

The first discharge electrode 82 and the second discharge electrode 84 are opposed to each other by a first side surface portion 82b extending in one direction orthogonal to the stacking direction and a second side surface portion 84b extending in the one direction. So as to be spaced apart from each other. Thereby, the gap portion GP3 ₁ is formed between the first side surface portion 82b and the second side surface portion 84b (see FIG. 12). With such a configuration, the gap portion GP3 ₁ between a predetermined higher voltage is applied between the external electrode 41 and external electrode 43, a first discharge electrode 82 and the second discharge electrode 84, discharge occurs .

The first discharge electrode 83 and the second discharge electrode 84 are opposed to each other by a first side surface portion 83b extending in one direction orthogonal to the stacking direction and a second side surface portion 84b extending in the one direction. So as to be spaced apart from each other. Accordingly, gap GP3 ₂ is formed between the first side surface portion 83b and the second side surface portion 84b (see FIG. 12). With such a configuration, when a predetermined voltage or higher is applied between the external electrode 41 and the external electrode 45, a discharge is generated in the gap GP between the first discharge electrode 83 and the second discharge electrode 84.

  The discharge inducing portion 85 is located between the first discharge electrodes 82 and 83 and the second discharge electrode 84 and the side surface 4 d of the element body 4. The discharge inducing portion 85 connects the first discharge electrodes 82, 83 so as to connect the first side surfaces 82 b, 83 b of the first discharge electrodes 82, 83 and the second side surfaces 84 b of the second discharge electrode 84. And in contact with the second discharge electrode 84. That is, the discharge inducing portion 85 is formed so as to connect portions of the first discharge electrodes 82 and 83 and the second discharge electrode 84 that face each other, and the first discharge electrodes 82 and 83 and the second discharge electrode 84. It has the function of making it easy to generate a discharge.

The element body 4 has a cavity 86 (see FIGS. 12 and 14). Cavity 86 is positioned between the discharge inducing portion 85 and the first coil L3 ₁ and the second coil L3 _2. The surface that defines the cavity portion 86 includes a surface 85a on which the first discharge electrodes 82 and 83 and the second discharge electrode 84 are disposed in the discharge inducing portion 85, and a surface 86b that faces the surface 85a. . Surface 85a is also the first coil L3 ₁ and the second coil L3 ₂ surface facing the discharge inducing section 85. Face 86b facing the surface 85a is positioned between the surface 85a and the first coil L3 ₁ and the second coil L3 ₂ in the stacking direction of the insulator layer 10. On the surface 85a, the first discharge electrodes 82 and 83 and the second discharge electrode 84 are mounted on the first side surface portions 82b and 83b and the second side surface portion 84b, which are portions facing each other. It is formed in this way.

The surface 86b facing the surface 85a is formed to be larger than the surface 85a, and is formed so as to cover the entire surface 85a when viewed from the stacking direction of the insulator layer 10. That is, the cavity portion 86, as viewed in the stacking direction from the first coil L3 ₁ and the second coil L3 ₂ side are positioned so as to cover the entire discharge inducing portion 85. Since the surface that defines the cavity 86 includes the surface 85a of the discharge inducing portion 85, the cavity 86 includes the first side surface portion 82b and the second side surface portion 84b that are located on the surface 85a, and the first side surface portion 84b. The side surface portion 83b and the second side surface portion 84b are in contact with the discharge inducing portion 85. The cavity 86 has a function of absorbing thermal expansion of the first discharge electrodes 82 and 83, the second discharge electrode 84, the insulator layer 10, and the discharge inducing portion 85 during discharge.

The 3ESD suppressor SP3 ₃ includes a first discharge electrode 87 and the second discharge electrode 84 which are spaced apart from each other on the same insulator layer 10, is connected to the first discharge electrode 87 and the second discharge electrode 84 and discharge The induction part 89 and the cavity part 90 which covers the discharge induction part 89 are comprised. The fourth ESD suppressor SP3 ₄ connects the first discharge electrode 88 and the second discharge electrode 84, which are spaced apart from each other in the same insulator layer 10, and the first discharge electrode 88 and the second discharge electrode 84. It includes a discharge inducing portion 89 and a cavity 90 that covers the discharge inducing portion 89.

The first discharge electrode 87 has an L shape extending in the short side direction and the long side direction of the insulator layer 10. The first discharge electrode 87 extends in the short direction of the insulator layer 10 and has an end portion 87a. The end portion 87 a is pulled out to the side surface 4 e of the element body 4, is exposed to the side surface 4 e, and is connected to the external electrode 44. That is, the first discharge electrode 87, through the external electrode 44 is electrically connected to the second end E3 ₃ of the coil L3 _2. The first discharge electrode 87 has a first side surface 87 b extending in the longitudinal direction of the insulator layer 10 and facing the second discharge electrode 84.

The first discharge electrode 88 has an L shape extending in the short side direction and the long side direction of the insulator layer 10. The first discharge electrode 88 extends in the short direction of the insulator layer 10 and has an end portion 88a. The end portion 88 a is drawn to the side surface 4 f of the element body 4, is exposed to the side surface 4 f, and is connected to the external electrode 46. That is, the first discharge electrode 88, through the external electrode 46 is electrically connected to the first other end E3 ₄ of the coil L3 _2. The first discharge electrode 88 has a first side surface portion 88 b that extends in the longitudinal direction of the insulator layer 10 and faces the second discharge electrode 84.

  The second discharge electrode 84 extends in the longitudinal direction of the insulator layer 10, and includes an end portion 84 c and a second side surface portion 84 d that faces the first side surface portions 87 b and 88 b of the first discharge electrodes 87 and 88. ,have. The end portion 84 c is drawn to the end surface 4 b of the element body 4, is exposed to the end surface 4 b, and is connected to the external electrode 42.

The first discharge electrode 87 and the second discharge electrode 84 are opposed to each other by a first side surface portion 87b extending in one direction orthogonal to the stacking direction and a second side surface portion 84d extending in the one direction. So as to be spaced apart from each other. Thereby, the gap portion GP3 ₃ is formed between the first side surface portion 87b and the second side surface portion 84d (see FIG. 13). With this configuration, when a predetermined or more voltage is applied between the external electrode 42 and external electrode 44, the gap portion GP3 ₃ between the first discharge electrode 87 and the second discharge electrode 84, discharge occurs .

The first discharge electrode 88 and the second discharge electrode 84 are opposed to each other by a first side surface portion 88b extending in one direction orthogonal to the stacking direction and a second side surface portion 84d extending in the one direction. So as to be spaced apart from each other. Thereby, the gap portion GP3 ₄ is formed between the first side surface portion 88b and the second side surface portion 84d (see FIG. 13). With this configuration, when a predetermined voltage higher than between the external electrodes 42 and the external electrode 46 is applied, the gap GP3 ₄ between the first discharge electrode 88 and the second discharge electrode 84, discharge occurs .

  The discharge inducing portion 89 is located between the first discharge electrodes 87 and 88 and the second discharge electrode 84 and the side surface 4 d of the element body 4. The discharge inducing section 89 connects the first discharge electrodes 87, 88 so as to connect the first side faces 87b, 88b of the first discharge electrodes 87, 88 and the second side faces 84d of the second discharge electrode 84 to each other. And in contact with the second discharge electrode 84. That is, the discharge inducing portion 89 is formed so as to connect portions of the first discharge electrodes 87 and 88 and the second discharge electrode 84 that face each other, and the first discharge electrodes 87 and 88 and the second discharge electrode 84. It has the function of making it easy to generate a discharge.

The element body 4 has a cavity 90 (see FIGS. 13 and 14). Cavity 90 is located between the discharge inducing portion 89 and the first coil L3 ₁ and the second coil L3 _2. The surface that defines the hollow portion 90 includes a surface 89a on which the first discharge electrodes 87 and 88 and the second discharge electrode 84 are disposed in the discharge inducing portion 89, and a surface 90b that faces the surface 89a. . Surface 89a is also the first coil L3 ₁ and the second coil L3 ₂ surface facing the discharge inducing section 89. Face 90b facing the surface 89a is positioned between the surface 89a and the first coil L3 ₁ and the second coil L3 ₂ in the stacking direction of the insulator layer 10. On the surface 89a, the first discharge electrodes 87, 88 and the second discharge electrode 84 are mounted on the first side surface portions 87b, 88b and the second side surface portion 84d, which are portions facing each other. It is formed in this way.

The surface 90b facing the surface 89a is formed larger than the surface 89a, and is formed so as to cover the entire surface 89a when viewed from the stacking direction of the insulator layer 10. That is, the cavity 90, as viewed in the stacking direction from the first coil L3 ₁ and the second coil L3 ₂ side are positioned so as to cover the entire discharge inducing portion 89. Since the surface defining the cavity 90 includes the surface 89a of the discharge inducing portion 89, the cavity 90 includes the first side surface portion 87b and the second side surface portion 84d located on the surface 89a, and the first side surface portion 84d. The side surface portion 88b and the second side surface portion 84d are in contact with the discharge inducing portion 89. The cavity 90 has a function of absorbing thermal expansion of the first discharge electrodes 87 and 88, the second discharge electrode 84, the insulator layer 10, and the discharge inducing portion 89 during discharge.

The first capacitor C3 ₁ , the second capacitor C3 ₂ , the third capacitor C3 ₃ , and the fourth capacitor C3 ₄ are more primed than the first and second coils L3 ₁ and L3 ₂ in the stacking direction of the insulator layer 10. 4 is formed at a position close to the side surface 4c. The first capacitor C3 ₁ is constituted by conductors 91 ₁ and the conductor 92 ₁ is a plurality of internal conductors which are juxtaposed in the laminating direction of the insulator layers 10 inside the body 4. Conductors 91 ₁ and the conductor 92 _1, in the laminating direction of the insulator layer 10, from the side closer to the side surface 4c of the body 4, are juxtaposed in the order of the conductor 91 ₁ and the conductor 92 _1.

Ends 91a ₁ of the conductor 91 ₁ is drawn to the side face 4f of the element body 4 is exposed to the side surface 4f, is connected to the external electrode 45. That is, the conductor 91 _1, through the external electrodes 45 are connected to the first coil L3 ₁ in the other end E3 ₂ and the 2ESD suppressor SP3 ₂ First discharge electrodes 83 the ends 83a electrically in included. Ends 92a ₁ of the conductor 92 ₁ is drawn to the end face 4a of the body 4 is exposed to the end surface 4a, is connected to the external electrode 41. That is, the conductor 92 _1, through the external electrode 41 is the second end 84a electrically connected to the discharge electrodes 84 included in the first and second 2ESD suppressor _SP3 1, SP3 _2.

The second capacitor C3 ₂ is constituted by a conductor 91 ₂ and conductor 92 ₂ is a plurality of internal conductors which are juxtaposed in the laminating direction of the insulator layers 10 inside the body 4. Conductors 91 ₂ and conductor 92 ₂ is disposed in each conductor 91 ₁ and the conductor 92 ₁ same insulator layer and. That is, the conductor 91 ₂ and conductor 92 _2, the stacking direction of the insulator layer 10, from the side closer to the side surface 4c of the body 4, it is juxtaposed in the order of conductor 91 ₂ and conductor 92 _2.

End 91a ₂ of the conductor 91 ₂ is drawn to the side face 4f of the element body 4 is exposed to the side surface 4f, is connected to the external electrode 46. That is, the conductor 91 _2, through the external electrode 46 is connected to the second coil L3 ₂ of the other end E3 ₄ and the 4ESD suppressor SP3 ₄ First discharge electrodes 88 the ends 88a electrically in included. End 92a ₂ of the conductor 92 ₂ is drawn to the end face 4b of the body 4 is exposed to the end face 4b, is connected to the external electrodes 42. That is, the conductor 92 _2, through the external electrodes 42 are connected third and 4ESD suppressor _SP3 3, SP3 ₄ to the second discharge end of the electrode 84 84c and electrically included.

The third capacitor C3 ₃ is constituted by a conductor 91 ₃ and the conductor 92 ₁ is a plurality of internal conductors which are juxtaposed in the laminating direction of the insulator layers 10 inside the body 4. Conductors 91 ₃ and the conductor 92 _1, in the laminating direction of the insulator layer 10, from the side closer to the side surface 4c of the body 4, are juxtaposed in the order of the conductor 92 ₁ and the conductor 91 _3.

Ends 91a ₃ of the conductor 91 ₃ is drawn to the side surface 4e of the element body 4 is exposed to the side surface 4e, is connected to the external electrode 43. That is, the conductor 91 _3, through the external electrodes 43 are connected to the first coil L3 ₁ end E3 ₁ and the end portion 82a and the electrically of the first 1ESD suppressor first discharge electrode 82 that is included in SP3 _1.

The fourth capacitor C3 ₄ is composed of a conductor 91 ₄ and conductor 92 ₂ is a plurality of internal conductors which are juxtaposed in the laminating direction of the insulator layers 10 inside the body 4. Conductors 91 ₄ and the conductor 92 ₂ is disposed in each conductor 91 ₃ and the conductor 92 ₁ same insulator layer and. That is, the conductor 91 ₄ and the conductor 92 _2, the stacking direction of the insulator layer 10, from the side closer to the side surface 4c of the body 4, it is juxtaposed in the order of conductor 92 ₂ and conductor 91 _4.

End 91a ₄ of the conductor 91 ₄ is drawn to the side surface 4e of the element body 4 is exposed to the side surface 4e, is connected to the external electrode 44. That is, the conductor 91 _4, through the external electrode 44 is connected to the second coil L3 ₂ one end E3 ₃ and the end 87a and the electrically of the first 3ESD suppressor first discharge electrode 87 that is included in SP3 _3.

As described above, also in the third embodiment, as in the first and second embodiments described above, when viewed from the first and second coils L3 ₁ and L3 ₂ side in the stacking direction, the cavity 86 is induced to discharge. The cavity portion 90 is positioned so as to cover the entire portion 85, and the cavity portion 90 is positioned so as to cover the entire discharge inducing portion 89. Accordingly, the hollow portions 86 and 90 are positioned between the first and second coils L3 ₁ and L3 ₂ (inner conductors 75 _{1 to} 78 ₁ , 75 _{2 to} 78 ₂ ) and the respective discharge inducing portions 85 and 89. ing. Therefore, even if the material constituting the inner conductor _{75 1-78 1,} 75 2 to 78 ₂ can diffuse, by each respective cavity 86, 90, inner conductor _{75 1-78 1,} 75 2 to 78 ₂ is suppressed from diffusing into the discharge inducing portions 85 and 89. As a result, changes in the characteristics of the discharge inducing portions 85 and 89 can be suppressed.

The hollow portions 86 and 90 having a lower dielectric constant than the discharge inducing portions 85 and 89 are connected to the first and second coils L3 ₁ and L3 ₂ (internal conductors 75 _{1 to} 78 ₁ , 75 _{2 to} 78 ₂ ) and the respective discharges. It is located between the induction parts 85 and 89. Therefore, even if the dielectric constant is high due to the fact that each discharge inducing portion 85, 89 contains metal particles, it is generated by each cavity inducing portion 85, 89 due to the dielectric constant of each discharge inducing portion 85, 89. Parasitic capacitance is reduced. As a result, parasitic capacitance generated between the first and second coils L3 ₁ and L3 ₂ and the first to fourth ESD suppressors SP2 ₁ , SP2 ₂ , SP2 ₃ and SP2 ₄ can be reduced.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to the said embodiment, It changed within the range which does not change the summary described in each claim, or applied to the other thing It may be a thing.

  The configurations of the first discharge electrodes 11, 61, 65, 68, 72, 82, 83, 87, 88 and the second discharge electrodes 12, 62, 69, 84 are limited to the configurations shown in FIGS. However, the length, width, and size of the gap part GP may be changed as appropriate.

  The positions of the discharge inducing parts 13, 63, 66, 70, 73, 85, 90 and the cavity parts 14, 64, 67, 74, 86, 90 are the positions shown in FIGS. 2 to 4 and FIGS. It is not limited to.

1, 2, 3... Electrostatic protection component, 10 .. Insulator layer, 11, 61, 65, 68, 72, 82, 83, 87, 88... First discharge electrode, 11b, 61b, 65b, 68b, 72b, 82b , 83b, 87b, 88b ... first side surface portion, 12, 62, 69, 84 ... second discharge electrode, 12b, 62b, 62d, 69b, 69d, 84b, 84d ... second side surface portion, 13, 63, 66, 70,73,85,89 ... discharge inducing section, 14,64,67,74,86,90 ... cavity, 21～24,51～54,75 _{1-78 1, 75} 2 to 78 2 _... inner conductor, L1, L2 ₁ , L2 ₂ , L3 ₁ , L3 ₂ ... coil, SP1, SP2 ₁ , SP2 ₂ , SP2 ₃ , SP2 ₄ , SP3 ₁ , SP3 ₂ , SP3 ₃ , SP3 ₄ ... ESD suppressor.

Claims (3)

An element body formed by laminating a plurality of insulator layers;
A coil configured by connecting a plurality of internal conductors to each other, and a coil disposed in the element body;
The first and second discharge electrodes arranged spaced apart from each other, and the first and second discharge electrodes are in contact with the first and second discharge electrodes so as to connect each other, and contain metal particles And an ESD suppressor disposed in the element body so as to be aligned with the coil in the stacking direction of the plurality of insulator layers.
The first and second discharge electrodes are located on the coil side of the discharge inducing portion as seen in the stacking direction,
The element body is positioned so as to cover the entire discharge inducing portion when viewed in the stacking direction from the coil side, and the portions facing each other in the first and second discharge electrodes and the discharge inducing portion. Having a hollow portion in contact with,
ESD protection parts. The melting point of the material constituting the inner conductor is lower than the melting point of the material constituting the metal particles,
The electrostatic protection component according to claim 1. The first discharge electrode has a first side surface portion extending in one direction orthogonal to the stacking direction,
The second discharge electrode has a second side surface portion extending in the one direction,
The first and second discharge electrodes are disposed so as to be separated from each other so that the first side surface portion and the second side surface portion face each other.
The electrostatic protection component according to claim 1 or 2.

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