JP2003123936A - Electronic part and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic part capable of preventing deterioration of conductors. SOLUTION: A first insulating sheet 11 having a space 15 almost in the central part is arranged between second insulating sheets 14. Respective tip parts 12 of a pair of first conductors 13 are provided in this space 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component used for protecting electronic equipment from surges caused by static electricity and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a conventional electronic component, Japanese Patent Laid-Open No. 61-11
The one described in Japanese Patent No. 0985 is known.

FIG. 11A is a top view of a conventional electronic component,
FIG. 11B is a bottom view of the same.

In FIGS. 11A and 11B, a pair of conductors 2 is provided at both ends of the upper surface of a dielectric substrate 1, and each tip of the pair of conductors 2 has a tip 3 protruding from the conductor 2. Are provided so as to face each other. Also,
Lead terminals 4 are connected to the pair of conductors 2, respectively, and another conductor 5 is provided on the lower surface of the substrate 1. At least the conductor 2 and the other conductor 5 are covered with a covering layer (not shown). At this time, each tip 3 is exposed in the air from the coating layer. A discharge gap 6 is formed between the tip portions 3.

Further, the reason why the tip portions 3 are exposed to the air without being covered with the coating layer is that the discharge gap 6 between the tip portions 3 is discharged when a surge is applied if there is no space between the tip portions 3. This is because it does not occur.

A conventional method of manufacturing an electronic component will be described below.

In FIGS. 11A and 11B, first, a pair of conductors 2 are formed on both ends of the upper surface of the dielectric substrate 1 and another conductor 5 is formed on the lower surface by printing. At this time, tip portions 3 projecting from the conductor 2 are formed at the tips of the pair of conductors 2 so as to face each other.

Next, the lead terminals 4 are connected to the pair of conductors 2, respectively.

Finally, at least a pair of conductors 2 and another conductor 5 are coated with a coating layer. At this time, each tip 3 is exposed in the air.

FIG. 12 is a diagram showing an equivalent circuit of a conventional electronic component. In FIG. 12, the reference numerals of the components described in FIG. 11 are also attached.

As shown in FIG. 12, the first capacitor section C1 and the second capacitor section C2 are connected in series, and the discharge section D is connected in parallel with the series capacitor section. At this time, in the first capacitor section C1, the opposing electrodes are one of the pair of conductors 2 and the other conductor 5, and the dielectric is the dielectric substrate 1. The second capacitor portion C2 uses the opposite electrode as the other of the pair of conductors 2 and the other conductor 5, and uses the dielectric substance as the dielectric substrate 1. The discharge part D is composed of the tip part 3 and the discharge gap 6 between the tip parts 3, and when a surge is applied to this electronic component, the surge does not flow to the first and second capacitor parts C1 and C2, It flows to this discharge part D and discharges in the discharge gap 6.

[0012]

In the above-mentioned conventional electronic component, since the tip portions 3 of the pair of conductors 2 are exposed to the air, the tip portions 3 of the conductor 2 will be exposed to moisture in the air when used for a long time. There was a problem that it would deteriorate due to factors such as the above.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an electronic component capable of preventing deterioration of a conductor and its tip.

[0014]

In order to achieve the above object, the present invention has the following constitution.

The invention according to claim 1 of the present invention is
A pair of first conductors are sandwiched between the plurality of first insulating sheets so that their tip portions are opposed to each other, and the tip portions of the pair of first conductors are arranged at least in the plurality of first insulating sheets. The first insulating sheet has a structure in which it is arranged in the space provided on one of the joint surfaces, and thus the periphery of the space can be covered with the first insulating sheet. The respective tips of the conductor are not exposed to the air, and therefore, the effect of preventing the deterioration of the first conductor can be obtained.

The invention according to claim 2 of the present invention is
The tip portion of the first conductor is made thinner than the other portions of the first conductor, which makes it possible to increase the current density at the tip portion of the first conductor when a surge is applied. It is possible to obtain the function and effect that the electric discharge is facilitated during the period.

The invention according to claim 3 of the present invention is
The other end portions of the pair of first conductors are provided at positions that do not face each other, whereby the other end portions of the pair of first conductors connected to the line of the mounting board are provided. In the above, the effect that the signal lines can be easily connected to each other can be obtained.

The invention according to claim 4 of the present invention is particularly
It has a configuration in which the tip of the first conductor is bent upward. Since this allows the tip of the first conductor to float in the space, organic matter in the space generated by electric discharge Of the above-mentioned carbides can be prevented from being generated between the tip portions of the pair of first conductors, and thus, it is possible to prevent discharge at a load lower than a predetermined surge and stabilize the discharge voltage. Is obtained.

The invention according to claim 5 of the present invention is particularly
The first insulating sheet and the dielectric sheet are provided between the upper and lower second insulating sheets, and a space is provided at a substantially central portion of at least one of the first insulating sheet and the dielectric sheet. It has a structure in which the respective tip portions of the pair of first conductors are provided inside, so that the periphery of the space can be covered with the first insulating sheet, the dielectric sheet, and the second insulating sheet. Therefore, the respective tip portions of the pair of first conductors provided in this space are not exposed to the air, and therefore, the effect of preventing the deterioration of the first conductor can be obtained.

The invention according to claim 6 of the present invention is
A third conductor and another dielectric sheet are provided between the first conductor and the first insulating sheet, and the third conductor is provided on the upper surface of the first insulating sheet and the other dielectric sheet is provided on the upper surface of the third conductor. It has a structure in which the dielectric sheets are respectively arranged, so that the conductor forming the counter electrode together with the pair of first conductors can be arranged not only in the upper second conductor but also in the lower third conductor. Since it is provided, the area of the counter electrode facing the pair of first conductors can be increased, which has the effect of increasing the capacitance of the capacitor section.

The invention according to claim 7 of the present invention is
It has a structure in which a hole that is continuous with the space is provided in at least one of the first insulating sheet and the dielectric sheet. This makes it possible to increase the size of the entire space, and It is possible to obtain the function and effect that the discharge between the tip portions of the pair of first conductors can be performed more reliably.

The invention according to claim 8 of the present invention is
The foamed porous body is provided in a substantially central portion of the upper surface of the insulating substrate so as to cover the respective tip portions of the pair of first conductors, and is covered with the coating layer.
Since the periphery of the foamed porous body can be covered with the insulating substrate, the first conductor, and the coating layer, the respective tip portions of the pair of first conductors covered with the foamed porous body are not exposed to the air, As a result, the function and effect of preventing the deterioration of the first conductor can be obtained.

The invention according to claim 9 of the present invention is
The tip portion of the first conductor is made thinner than the other portions of the first conductor, whereby the current density at the tip portion of the first conductor can be increased when a surge is applied. It is possible to obtain the effect that discharge is easily generated between the parts.

According to a tenth aspect of the present invention, in particular, a step of sandwiching a pair of first conductors between a plurality of first insulating sheets so that their tip portions face each other, and a plurality of first insulating sheets.
The step of forming a space in at least one of the insulating sheets, and the step of disposing the tip portions of the pair of first conductors in the space provided on the joint surface of the first insulating sheet. As a result, since the periphery of the space can be covered with the first insulating sheet, the respective tip portions of the pair of first conductors provided in the space are not exposed to the air,
As a result, the function and effect of preventing the deterioration of the first conductor can be obtained.

The invention according to claim 11 of the present invention has a construction in which the first conductor is formed by plating, which prevents the peripheral portion of the first conductor from bleeding. Since it can be prevented, the distance between the respective tip portions of the pair of first conductors can be kept constant, which can prevent discharge during normal load or no discharge during surge application, The effect that the discharge starting voltage can be stabilized can be obtained.

According to a twelfth aspect of the present invention, in particular, the first insulating sheet and the dielectric sheet are arranged above and below the second insulating sheet.
Between the first and second insulating sheets, a space is formed at a substantially central portion of at least one of the first insulating sheet and the dielectric sheet, and the tip portions of the pair of first conductors are formed in the space. Since the space can be covered with the first insulating sheet, the dielectric sheet, and the second insulating sheet, the pair of first conductors formed in the space can be covered. The respective tip portions of the above are not exposed to the air, and therefore, the effect of preventing the deterioration of the first conductor can be obtained.

According to a thirteenth aspect of the present invention, in particular, the foamed porous body is formed in a substantially central portion of the upper surface of the insulating substrate so as to cover the respective tip portions of the pair of first conductors, and is covered. It has a structure in which it is formed so as to be covered with a layer. With this, since the periphery of the foamed porous body is covered with the insulating substrate, the first conductor, and the coating layer, the pair of first porous layers covered with the foamed porous body is covered. The respective tip portions of the first conductor are not exposed to the air, so that the effect of preventing deterioration of the first conductor can be obtained.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, the first embodiment will be used to particularly describe the claims 1 to 4, 10, and 11 of the present invention.
The invention described in 1. will be described.

FIG. 1 is an exploded perspective view of an electronic component according to the first embodiment of the present invention.

In FIG. 1, a plurality of first insulating sheets 1
1 and a pair of first conductors 13 sandwiched between the plurality of first insulating sheets 11 and provided at both ends of the upper surface of the first insulating sheet 11 so that their tip portions 12 face each other.
And a second insulating sheet 11 sandwiching the first insulating sheet 11.
Of the first insulating sheet 11 in contact with the first conductor 13, a space 15 is provided at a substantially central portion of the first insulating sheet 11, and a pair of first conductors is provided in the space 15. Each tip 12 of 13 is provided. In addition, the other end 16 of the pair of first conductors 13, that is, the end opposite to the tip 12 provided in the space 15 is connected to an external electrode (not shown).

The first insulating sheet 11 has a substantially rectangular shape and is made of an insulating material such as ceramic or magnetic material. A resin may be used as long as it has an insulating property.

The pair of first conductors 13 have their front end portions 12 facing each other at both ends of the upper surface of the first insulating sheet 11,
Further, they are provided so as not to contact each other, and are made of a material having good conductivity such as silver, silver palladium, copper or the like. Then, the respective tip portions 12 of the pair of first conductors 13 are provided in the substantially central portion of the first insulating sheet 11 so as not to be exposed at the end surface of the first insulating sheet 11, and the other end portion 16 is the first portion. Insulation sheet 1
It is provided so as to be exposed at the end surface of 1.

The tip portions 12 of the pair of first conductors 13 are also provided.
The space is a discharge gap 17 in which discharge occurs when noise is applied. The size of the discharge gap 17, that is, the distance between the tip portions 12 of the first conductors 13 may be changed according to the magnitude of the surge.

Further, the tip portion 12 of the first conductor 13 is
It is thinner than the other parts of the first conductor 13. As a result, the current density at the tip portions 12 of the first conductors 13 can be increased when a surge is applied, so that an effect that discharges between the tip portions 12 are facilitated is obtained. That is, this effect can be expected when the tip 12 is thinner and sharper.

Since it is necessary to keep the distance of the discharge gap 17 constant, it is preferable that the material of the first conductor 13 is a material in which ion migration does not easily occur, for example, copper.

The tip portion 12 of the first conductor 13 may be bent upward so that the tip portion 12 of the first conductor 13 floats in the space 15. By doing so, the carbide of the organic substance in the space 15 generated by the discharge adheres to the first insulating sheet 11 on the upper and lower surfaces of the first conductor 13, so that the tips of the pair of first conductors 13 are formed. It is possible to prevent this from occurring between the two first conductors 13, and thereby to prevent the insulation resistance of the discharge gap 17 between the tip portions 12 of the pair of first conductors 13 from decreasing, so that with a load lower than a predetermined surge. It is possible to prevent discharge and stabilize the discharge voltage.

The second insulating sheet 14 has a substantially rectangular shape, is provided on the upper and lower surfaces of the first insulating sheet 11, respectively, and is made of an insulating material such as ceramic or magnetic material, and is the same as the first insulating sheet 11. It is preferably a material. A resin may be used as long as it has an insulating property. This second
One insulating sheet 14 is provided on each of the uppermost surface and the lowermost surface of the electronic component to prevent deterioration of the first conductor 13 and exposure of the space 15. In FIG. 1, the first insulating sheet 11 and the second insulating sheet 14 are provided under the first conductor 13 one by one, but the deterioration of the first conductor 13 or the exposure of the space 15 is prevented. Either if it can be prevented
Only one sheet is acceptable.

The first insulating sheet 11 and the second insulating sheet 14 are substantially rectangular and have the same size, and by stacking these sheets, a substantially rectangular parallelepiped composite component can be obtained.

Furthermore, the first and second insulating sheets 11, 1
A plurality of 4 may be provided if necessary.

The space 15 is a through hole provided in at least one of the upper and lower first insulating sheets 11 in contact with the first conductor 13. The space 15 has a pair of first holes.
Each of the tip portions 12 of the conductor 13 is provided. Space 1
A discharge space 5 is provided in the discharge gap 17 for reliable discharge. Further, in FIG. 1, the first conductor 13
The state where the space 15 is provided in the first insulating sheet 11 that is bonded to the upper surface is shown. Furthermore, the space 15 may be a recess or a slit instead of the through hole. Furthermore, although the space 15 is circular in FIG. 1, it may have another shape.

The space 15 may be provided in both of the first insulating sheets 11 contacting the upper and lower surfaces of the first conductor 13,
A plurality of first insulating sheets 11 are provided above and below the first conductor 13 so that the spaces 15 are continuous with each other.
It may be formed on the conductor 13. By doing so, the discharge space can be increased, so that discharge between the tip portions 12 of the pair of first conductors 13 at the time of applying a surge can be performed more reliably.

In the space 15, a pair of first conductors 13 is provided.
Each tip 12 of each of the
A discharge gap 17 is provided between them. Further, the space 15 is provided in the substantially central portion of the seat. That is, the pair of first conductors 1
Each tip portion 12 of No. 3 is provided in the substantially central portion of the first insulating sheet 11. This is because the discharge gap 17 is not exposed to the air, so that the space 15 should not be exposed to the end surface of the sheet.

The external electrodes are provided on both end surfaces of the electronic component so as to be connected to only the pair of first conductors 13.
This external electrode is composed of silver plating, nickel plating, and tin plating in this order from the inside.

In the electronic component according to the first embodiment of the present invention described above, the space 1 is formed between the second insulating sheets 14 in a substantially central portion.
Since the first insulating sheet 11 having the number 5 is provided and the tip portions 12 of the pair of first conductors 13 are provided in the space 15, the first insulating sheet 11 is surrounded by the space 15 and the discharge gap 17. , The second insulating sheet 14 can be covered and hermetically sealed. As a result, the respective tip portions 12 of the pair of first conductors 13 provided in the space 15 are not exposed to the air, so that the discharge gap The effect of preventing deterioration of the first conductor 13 forming 17 is obtained. That is, whereas the conventional product discharges into the air, in the present invention, the discharge occurs in the sealed space 15, so that the tip portions of the pair of first conductors 13 provided in this space 15 are each. 12 need not be exposed to air.

The method of manufacturing the electronic component according to the first embodiment of the present invention will be described below.

In FIG. 1, first, a predetermined number of substantially rectangular first insulating sheets 11 and second insulating sheets 14 are formed from an insulating material such as ceramic or magnetic material. At this time, a through hole serving as the space 15 is formed by punching or the like at approximately the center of at least one of the plurality of first insulating sheets 11.

Next, a predetermined number of first insulating sheets 11 are formed on the upper surface of the second insulating sheet 14.

Next, a pair of first conductors 13 made of a material having good conductivity such as silver, silver palladium, copper or the like is provided on both ends of the upper surface of the first insulating sheet 11, and their tip portions 12 face each other. And are formed so as not to contact each other. A discharge gap 17 is formed between the tip portions 12. At this time, the front end portions 12 of the pair of first conductors 13 are formed in the substantially central portion of the first insulating sheet 11 so as not to be exposed at the end surfaces of the first insulating sheet 11, and the other end portion 16 is 1 insulating sheet 11
It is formed so as to be exposed at the end surface of. Further, the tip portion 12 of the first conductor 13 is made thinner than the other portions of the first conductor 13.

If the first conductor 13 is formed by plating, it is possible to prevent the peripheral portion of the first conductor 13 from bleeding. Therefore, each tip 1 of the pair of first conductors 13 is prevented.
The distance between the two, that is, the dimension of the discharge gap 17 can be kept constant, whereby it is possible to prevent discharge during normal load or no discharge during surge application, and stabilize the discharge start voltage. The effect that can be obtained is obtained. That is, when printing is used, bleeding may occur, and the distance of the discharge gap 17 may deviate from the set value. Therefore, discharge may occur even if a predetermined surge is not applied. Further, as a forming method by plating, there is a method in which another sheet plated in a predetermined shape is transferred.

Next, a space 15 is formed on the upper surface of the first conductor 13.
The first insulating sheet 11 having is formed. At this time,
In the space 15, the tip portions 12 of the pair of first conductors 13 are provided.
To be prepared.

Next, the second insulating sheet 14 is formed on the upper surface of the first insulating sheet 11 having the space 15.

Next, the laminate obtained as described above is heated and fired. By firing, the first and second
The insulating sheets 11 and 14 are integrated into an insulator.

By firing in a vacuum or an inert gas such as argon, the amount of organic substances in the space 15 can be reduced, so that carbonization of the organic substances due to discharge can be prevented. Since it is possible to prevent the insulation resistance between the end portions 12 of the first conductors 13, that is, the discharge gap 17 from being lowered by the carbide of the organic substance, it is possible to prevent discharge at a load lower than a predetermined surge, and discharge. The voltage can be stabilized.

Finally, a pair of first members are provided on both end faces of this laminate.
The external electrode is formed so as to be connected to only the conductor 13 of.
This external electrode is formed by plating silver, nickel, and tin in this order from the inside to obtain the electronic component according to the first embodiment of the present invention.

At this time, if the laminate is impregnated with a fluorinated silane coupling agent in vacuum before nickel plating is formed, the fluorinated silane cup having water repellency in the fine pores present in the laminated product. Since it can be filled with a ring agent,
Moisture resistance can be improved.

The large first and second insulating sheets 1
1 and 14 are produced and laminated as described above, and then product 1
You may cut | disconnect by dicing etc. to the size equivalent to an individual piece.

By manufacturing in this way, the space 1
5 around the first insulating sheet 11, the second insulating sheet 1
Since the end portions 12 of the pair of first conductors 13 provided in the space 15 are not exposed to the air, the deterioration of the first conductor 13 can be prevented. The effect is obtained.

(Second Embodiment) The second embodiment of the present invention will be described below, particularly the inventions recited in claims 5, 6 and 12.

FIG. 2 is an exploded perspective view of an electronic component according to the second embodiment of the present invention, and FIG. 3A is a sectional view taken along the line AA.

In FIG. 2 and FIG. 3A, a pair of first conductors 13 are provided at both ends of the upper surface of the first insulating sheet 11 so that their tip portions 12 face each other, and the first conductors 13.
The dielectric sheet 18 provided on the upper surface of the conductor 13 and the second conductor 19 provided on the upper surface of the dielectric sheet 18.
And a second insulating sheet 14 provided on the upper surface of the second conductor 19 and the lower surface of the first insulating sheet 11,
A space 15 is provided at a substantially central portion of at least one of the first insulating sheet 11 and the dielectric sheet 18 that is in contact with the first conductor 13, and each tip of the pair of first conductors 13 is provided in the space 15. A section 12 is provided. In addition, the external electrodes 20 are connected to the other end portions 16 of the pair of first conductors 13, that is, the end portions on the opposite side of the tip portion 12 provided in the space 15.

The first insulating sheet 11 has a substantially rectangular shape and is made of an insulating material such as ceramic or magnetic material. A resin may be used as long as it has an insulating property.

The pair of first conductors 13 have their tip portions 12 opposed to each other at both ends of the upper surface of the first insulating sheet 11,
Further, they are provided so as not to contact each other, and are made of a material having good conductivity such as silver, silver palladium, copper or the like. Then, the respective tip portions 12 of the pair of first conductors 13 are provided in the substantially central portion of the first insulating sheet 11 so as not to be exposed at the end surface of the first insulating sheet 11, and the other end portion 16 is the first portion. Insulation sheet 1
It is provided so as to be exposed at the end surface of 1.

In addition, the tip portions 12 of the pair of first conductors 13
The space is a discharge gap 17 in which discharge occurs when noise is applied. The size of the discharge gap 17, that is, the distance between the tip portions 12 of the first conductors 13 may be changed according to the magnitude of the surge.

Furthermore, the tip portion 12 of the first conductor 13 is
It is thinner than the other parts of the first conductor 13. As a result, the current density at the tip portions 12 of the first conductors 13 can be increased when a surge is applied, so that an effect that discharges between the tip portions 12 are facilitated is obtained. That is, this effect can be expected when the tip 12 is thinner and sharper.

Since it is necessary to keep the distance of the discharge gap 17 constant, it is preferable that the material of the first conductor 13 is a material in which ion migration does not easily occur, for example, copper.

The dielectric sheet 18 has a substantially rectangular shape, is provided on the upper surface of the first conductor 13, and is made of a dielectric powder such as titanium oxide or barium titanate as a main material to cure the pasty dielectric composition. It consists of the resulting ceramic dielectric. Note that a resin material obtained by mixing titanium oxide or barium titanate and an epoxy resin may be used as long as it has an insulating property. In FIG. 2, a plurality of dielectric sheets 18 are provided, and a space 15 is provided in the dielectric sheet 18 in contact with the first conductor 13.

Further, a plurality of dielectric sheets 18 and first insulating sheets 11 may be provided if necessary. Especially the first
It is necessary to define the thickness of the dielectric sheet 18 to the extent that the electric conductor 13 does not discharge toward the second conductor 19.

The second conductor 19 is provided on the upper surface of the dielectric sheet 18, and is made of a material having good conductivity such as silver, silver palladium, copper or the like. The second conductor 19 is an integral body and is provided in the substantially central portion of the dielectric sheet 18 so as not to be connected to the external electrode 20. The second conductor 19 may be exposed on the end surface of the dielectric sheet 18, but it is preferably not exposed in consideration of deterioration of the second conductor 19 and the like. Furthermore, in FIG. 2, the second conductor 19 has a rectangular shape, but may have another shape such as a circle.

The second conductor 19, the first conductor 13 and the dielectric sheet 18 constitute a capacitor section. That is, the dielectric sheet 18 corresponds to the dielectric of the capacitor, and the second conductor 19 and the first conductor 13 formed via the dielectric sheet 18 correspond to the counter electrodes of the capacitor.

The second conductor 19 is provided so as to face the first conductor 13 in a top view. This is to obtain the capacitance value of the capacitor section.

The second insulating sheet 14 has a substantially rectangular shape and is provided on the upper surface of the second conductor 19 and the lower surface of the first insulating sheet 11, respectively, and is made of an insulating material such as ceramic or magnetic material. It is desirable that the same material as that of the first insulating sheet 11 is used. A resin may be used as long as it has an insulating property. One second insulating sheet 14 is provided on each of the uppermost surface and the lowermost surface of the electronic component to prevent deterioration of the first conductor 13 and the second conductor 19 and exposure of the space 15. In addition, in FIG. 2, the first insulating sheet 11 and the second insulating sheet 14 are provided under the first conductor 13 one by one. However, deterioration of the first conductor 13 or exposure of the space 15 is prevented. Only one of them may be used if it can be prevented.

First insulating sheet 11 and dielectric sheet 1
8 and the second insulating sheet 14 each have a substantially rectangular shape and the same size, and by stacking these sheets, a substantially rectangular parallelepiped electronic component can be obtained.

The space 15 has a first space which is in contact with the first conductor 13.
This is a through hole provided in at least one of the insulating sheet 11 and the dielectric sheet 18, and each tip portion 12 of the pair of first conductors 13 is provided in this space 15. Note that FIG. 2 shows a state in which the space 15 is provided in the dielectric sheet 18. Further, the space 15 may be a recess or a slit instead of the through hole. Further, although the space 15 has a circular shape in FIG. 2, it may have another shape.

FIG. 3B is a top view showing the outline of the relationship between the space 15 and the pair of first conductors 13.

As shown in FIG. 3B, the tip portions 12 of the pair of first conductors 13 are exposed in the space 15 so that the space 1
A discharge gap 17 between the tip portions 12 is provided in the inside 5. Further, the space 15 is provided in the substantially central portion of the seat. That is,
Each tip portion 12 of the pair of first conductors 13 is provided at a substantially central portion of the first insulating sheet 11. This is because the discharge gap 17 is not exposed to the air, so that the space 15 should not be exposed to the end surface of the sheet.

The space 15 is a discharge space for surely discharging in the discharge gap 17.

The external electrodes 20 are provided on both end faces of the electronic component so as to be connected to only the pair of first conductors 13. The external electrode 20 is formed from the inside in the order of silver plating, nickel plating, and tin plating.

The electronic component according to the second embodiment of the present invention described above includes the first insulating sheet 11 and the dielectric sheet 1.
8 is provided between the upper and lower second insulating sheets 14, and a space 15 is provided at a substantially central portion of at least one of the first insulating sheet 11 and the dielectric sheet 18, and a pair of spaces is provided in the space 15. Since each tip portion 12 of the first conductor 13 is provided, the space 15 and the discharge gap 17 can be covered and sealed with the first insulating sheet 11, the dielectric sheet 18, and the second insulating sheet 14. As a result, the tip portions 12 of the pair of first conductors 13 provided in the space 15 are not exposed to the air, so that the discharge gap 1
It is possible to obtain the effect of preventing the deterioration of the first conductor 13 that forms part 7. That is, whereas the conventional product discharges into the air, in the embodiment of the present invention, discharge occurs in the closed space 15, and therefore the pair of first conductors 13 provided in this space 15 It is not necessary to expose each of the tip portions 12 in the air.

Hereinafter, a method of manufacturing an electronic component according to the second embodiment of the present invention will be described.

In FIG. 2, first, a predetermined number of substantially rectangular first insulating sheets 11 and second insulating sheets 14 are formed from an insulating material such as ceramic or magnetic material. Further, a predetermined number of substantially rectangular dielectric sheets 18 are formed from a ceramic dielectric obtained by curing a paste-shaped dielectric composition using a dielectric powder such as titanium oxide or barium titanate as a main material. At this time, a through hole serving as the space 15 is formed by punching or the like at approximately the center of at least one of the first insulating sheet 11 and the dielectric sheet 18. In this embodiment, the space 15 is formed in the dielectric sheet 18.

Next, a predetermined number of first insulating sheets 11 are formed on the upper surface of the second insulating sheet 14.

Next, a pair of first conductors 13 made of a material having good conductivity such as silver, silver palladium, copper or the like is provided at both ends of the upper surface of the first insulating sheet 11, and their tip portions 12 face each other. And are formed so as not to contact each other. A discharge gap 17 is formed between the tip portions 12. At this time, the front end portions 12 of the pair of first conductors 13 are formed in the substantially central portion of the first insulating sheet 11 so as not to be exposed at the end surfaces of the first insulating sheet 11, and the other end portion 16 is 1 insulating sheet 11
It is formed so as to be exposed at the end surface of. Further, the tip portion 12 of the first conductor 13 is made thinner than the other portions of the first conductor 13.

If the first conductor 13 is formed by plating, it is possible to prevent the peripheral portion of the first conductor 13 from bleeding. Therefore, the tip portions 1 of the pair of first conductors 13 are prevented.
The distance between the two, that is, the dimension of the discharge gap 17 can be kept constant, whereby it is possible to prevent discharge during normal load or no discharge during surge application, and stabilize the discharge start voltage. The effect that can be obtained is obtained. That is, when printing is used, bleeding may occur, and the distance of the discharge gap 17 may deviate from the set value. Therefore, there is a possibility that discharge may occur even if a surge is not applied. Further, as a forming method by plating, there is a method in which another sheet plated in a predetermined shape is transferred.

Next, a space 15 is formed on the upper surface of the first conductor 13.
Forming a dielectric sheet 18 having At this time, the tip portions 12 of the pair of first conductors 13 are provided in the space 15.

Next, the dielectric sheet 18 having the space 15 is formed.
A dielectric sheet 18 having no space 15 is formed on the upper surface of the.

Next, the second conductor 19 made of an electrically conductive material, such as silver, silver palladium, or copper, is integrally formed on the substantially central portion of the upper surface of the dielectric sheet 18 having no space 15.
To form.

Next, the second insulating sheet 14 is formed on the upper surface of the second conductor 19.

Next, the laminate obtained as described above is heated and fired. By firing, as shown in FIG. 3A, an insulator 21 in which the first and second insulating sheets 11 and 14 are integrated and a dielectric 22 in which a plurality of dielectric sheets 18 are integrated are formed.

Finally, a pair of first layers are formed on both end faces of this laminate.
The external electrode 20 is formed so as to be connected only to the conductor 13. The external electrode 20 is formed by plating silver, nickel, and tin in this order from the inside to obtain the electronic component according to the second embodiment of the present invention.

At this time, if the laminate is impregnated with a fluorinated silane coupling agent in vacuum before the nickel plating is formed, the fluorinated silane cup having water repellency in the fine pores present in the laminated product. Since it can be filled with a ring agent,
Moisture resistance can be improved.

The large first and second insulating sheets 1
1, 14 and the dielectric sheet 18 may be produced, laminated as described above, and then cut into a size corresponding to one product by dicing or the like.

By manufacturing in this way, the space 1
5, the first insulating sheet 11, the dielectric sheet 18,
Since it can be covered with the second insulating sheet 14, the tip portions 1 of the pair of first conductors 13 formed in the space 15 are formed.
No. 2 is not exposed to the air, and therefore, the effect of preventing deterioration of the first conductor 13 is obtained.

FIG. 4 is a diagram showing an equivalent circuit of the electronic component of this embodiment. In FIG. 4, the reference numerals of the components described in FIG. 2 are also attached.

As shown in FIG. 4, the first capacitor section C
The 1st and 2nd capacitor | condenser part C2 is connected in series, and the discharge part D is connected in parallel with this serially connected capacitor part. At this time, in the first capacitor section C1, the counter electrode is one of the pair of first conductors 13 and the second conductor 19, and the dielectric is the dielectric sheet 18. In the second capacitor section C2, the counter electrode is the other of the second conductor 19 and the pair of first conductors 13, and the dielectric is the dielectric sheet 18.
I am trying. At this time, since the second conductor 19 is a continuous integrated body, it can serve as the counter electrodes of both the first capacitor section C1 and the second capacitor section C2.
The capacitor section C1 and the second capacitor section C2 can be connected in series. The discharge part D is a pair of first conductors 1.
3 and the discharge gap 17 between the tip portions 12.

This electronic component is normally used in electronic equipment as a first capacitor section C1 and a second capacitor section C.
Although the current is flowing only in 2, when a high-voltage surge due to static electricity or the like flows, the surge does not flow in the first and second capacitor sections C1 and C2, but flows into the discharge section D and the pair of first A discharge is generated in the discharge gap 17 between the respective tip portions 12 of the conductor 13.

Although the dielectric sheet 18 having the space 15 and the second insulating sheet 14 are provided via the dielectric sheet 18 having no space 15 in FIG. When it is necessary to increase the thickness or reduce the thickness of the product, the dielectric sheet 18 having no space 15 is unnecessary, and the second insulating sheet 14 is directly attached to the upper surface of the dielectric sheet 18 having the space 15. It may be necessary to provide it.

At this time, if the space 15 and the second conductor 19 are brought into contact with each other, when a surge is applied, the second conductor 19 is discharged and the second conductor 19 is damaged. It is necessary to provide a gap between the second conductor 19 and the second conductor 19.
The shape of the second conductor 19 is shown in FIG.
There is a method of forming a ring shape as shown in (a) or a U shape as shown in FIG. 5 (b). Also at this time, the second conductor 19 needs to be opposed to the pair of first conductors 13 in a top view. 5A and 5B are top views showing the outline of the relationship between the space 15 and the second conductor 19.

Further, as shown in FIG. 6, the first conductor 13
The third conductor 23 and another dielectric sheet 18a are provided between the first insulating sheet 11 and the first insulating sheet 11.
If the third conductor 23 is arranged on the upper surface of the first conductor 13 and the other dielectric sheet 18a is arranged on the upper surface of the third conductor 23, the conductor forming the counter electrode together with the pair of the first conductors 13 becomes the upper second conductor. Since it is provided not only on the conductor 19 but also on the lower third conductor 23, the area of the counter electrode facing the pair of first conductors 13 can be increased, thereby increasing the capacitance of the capacitor section. The effect that can be obtained is obtained.

(Third Embodiment) The third embodiment of the present invention will be described below with reference to the present invention.

The third embodiment of the present invention is different from the second embodiment in that a hole 24 that is continuous with the space 15 is provided in at least one of the first insulating sheet 11 and the dielectric sheet 18. Since the other points are the same as the other configurations and manufacturing methods, the description thereof will be omitted. The equivalent circuit is also the same as that of the first embodiment shown in FIG.

FIG. 7 is an exploded perspective view of an electronic component according to the third embodiment of the present invention, and FIG. 8A is a sectional view taken along the line AA.

7 and 8A, the dielectric sheet 18 on the upper surface of the dielectric sheet 18 in which the space 15 is provided,
The hole 24 is formed in the third insulating sheet 25 on the upper surface of the second conductor 19.
Is provided. At this time, the peripheral portion of the space 15 and the second
The second conductor 1 so that a gap is formed between the second conductor 1 and
The shape of 9 is a ring shape as shown in FIG.
In addition, you may make it a U-shape as shown in FIG.5 (b).

The hole 24 is provided continuously with the space 15,
The hole 24 and the space 15 constitute a discharge space 15a, and the size of the discharge space 15a is increased. Further, the hole 24 penetrates and is formed by punching or the like. The holes 24 on the uppermost surface and the lowermost surface may be hollows. Further, the discharge space 15a is provided so as not to be exposed to the air. That is, the hole 24 corresponds to the dielectric sheet 18,
The third insulating sheet 25 is provided so as not to be exposed at the end surface of the third insulating sheet 25 and the upper and lower surfaces thereof are not exposed by the second insulating sheet 14.

The third insulating sheet 25 has a substantially rectangular shape and is made of an insulating material such as ceramic or magnetic material. It is made of the same material as the first and second insulating sheets 11 and 14 and is formed in the same manner. Is desirable. If the large discharge space 15a is unnecessary due to the surge, it may not be used.

In FIG. 7, the hole 24 which forms the discharge space 15a together with the space 15 is formed in the third insulating sheet 25, but instead of the third insulating sheet 25, it may be formed in another dielectric sheet. . In addition, the holes 24 are formed in the dielectric sheet 1.
8 is provided on the side where the first insulating sheet 11 is provided, but it may be provided on the side where the first insulating sheet 11 is provided, and the side where the dielectric sheet 18 is provided and the side where the first insulating sheet 11 is provided are provided. You may prepare for both. However, the holes 24 are formed in the first insulating sheet 1
Since the height of the product becomes large when it is provided on the side where 1 is provided, it is preferable to provide it on the side where the dielectric sheet 18 is provided when the height of the product is limited.

Further, as shown in FIG. 6, a third conductor 23 and another dielectric sheet 18a are provided between the first conductor 13 and the first insulating sheet 11 to increase the capacitance of the capacitor section. You may make it large.

In the electronic component according to the third embodiment of the present invention described above, since the size of the entire discharge space 15a can be increased, the tip end portions 1 of the pair of first conductors 13 at the time of applying a surge.
The effect that the discharge between the two can be performed more reliably is obtained.

In the first to third embodiments of the present invention, as shown in FIGS. 2 and 7, the pair of first conductors 1 is used.
The other end portions 16 of the third conductor 3 are provided at positions facing each other, but when the other end portions 16 of the pair of first conductors 13 are provided at positions not facing each other, the external electrode 20 is removed. Each of the other end portions 16 of the pair of first conductors 13 connected to the line of the mounting board via the above can be easily connected to separate signal lines.

For example, as shown in FIG. 8B, the other end portions 16a, 16 of the pair of first conductors 13 are formed.
When b is provided on the adjacent side surfaces of the rectangular first insulating sheet 11, if the other end 16a is connected to the signal line and the other end 16b is connected to the ground, parts such as jumpers are reduced. it can. Of course, it is difficult to mount diagonally to connect to the signal line and the ground.

(Fourth Embodiment) The fourth embodiment of the present invention is different from the second embodiment in that two pairs of first conductors 13 and two second conductors 19 are provided and are provided in parallel. Since the other points are the same as the other configurations and manufacturing methods, the description thereof will be omitted. The equivalent circuit is the same as the embodiment shown in FIG. 4 in which two pieces are arranged in parallel. That is, in the second embodiment, the number of capacitors connected in series is one.
Although two capacitors are provided, in the present embodiment, two capacitors are independently provided.

FIG. 9 (a) is an exploded perspective view of an electronic component according to the fourth embodiment of the present invention, and FIG. 9 (b) is a main portion of the first and second pairs of first conductor 13 and second conductor 19. FIG. 3 is a top view schematically showing the positional relationship between the space 17 and the external electrode 20.

In FIGS. 9A and 9B, two pairs of first conductors 13 are arranged in parallel on the upper surface of the first insulating sheet 11, and the second conductor 19 is arranged on the upper surface of the dielectric sheet 18. Is 2
Individually installed. At this time, one second conductor 19 corresponds to the pair of first conductors 13, and one space 15 is provided in the dielectric sheet 18. Furthermore, space 15
All the tip portions 12 of the two pairs of first conductors 13 are exposed inside. If only one space 15 is provided in this manner, the space 15 is provided for all the end portions 12 of the first conductor 13.
Therefore, the productivity is improved because the formation of the is required only once.

Incidentally, a pair of first conductors 13 is used instead of two pairs.
There may be a total of two spaces 15 each corresponding to,
As shown in FIG. 7, a third insulating sheet 25 having holes 24 in the upper surface of the second conductor 19 may be provided.

Further, as shown in FIG. 6, the first conductor 1
3 and the first insulating sheet 11 between the other dielectric sheet 18a
The third conductor 23 may be provided to increase the capacitance of the capacitor section.

Furthermore, as described in the third embodiment,
The first insulating sheet 1 is provided with holes 24 which are continuous with the space 15.
It may be provided on at least one of 1 and the dielectric sheet 18. At this time, as shown in FIGS. 5A and 5B, the discharge space 15a and the second conductor 19 are prevented from coming into contact with each other.
The shape of the second conductor 19 needs to be ring-shaped or U-shaped. Since it is necessary to prevent the two second conductors 19 from contacting each other, when the product area is limited,
It is better to make the two second conductors 19 each have a U-shape so as to face each other.

Furthermore, as described with reference to FIG. 8B, the other end portions 1 of the pair of first conductors 13 are formed.
You may provide in the position which 6 does not mutually oppose.

In the fourth embodiment, two pairs of the first conductor 13 and the second conductor 19 are arranged in the lateral direction, but two pieces may be arranged in the height direction, and three or more pairs are arranged. The first conductor 13 and the second conductor 19 may be arranged side by side.

Since the electronic component according to the fourth embodiment of the present invention is provided with a plurality of pairs of the first conductor 13 and the second conductor 19 in one product, the area of the product is small and the electronic component is mounted. Only a small number of parts are required.

In Embodiments 2 to 4 of the present invention, if the same material as the dielectric sheet 18 is used as the first and second insulating sheets 11 and 14, the sheets can be formed from the same material. Therefore, productivity can be improved. Further, if a predetermined capacitance value can be obtained as the dielectric sheet 18, the first and second insulating sheets 11 and 14
May be used.

When a plurality of first insulating sheets 11 are provided, if one of the pair of first conductors 13 is provided on a different first insulating sheet 11, the first capacitor section C1 and the second capacitor section C1 can be formed. Since the capacitance values of the capacitor section C2 are different, it is possible to obtain an effect that it is possible to easily set a fine capacitance value for the entire capacitor section.

Further, the first conductor 13 and the second conductor 19
If the structure is formed in a mesh shape, the area of the pair of opposing electrodes of the capacitor section can be reduced, so that the capacitance of the capacitor section can be easily reduced. In order to form a mesh shape, the plating or printing pattern may be formed in a mesh shape.

Furthermore, when it is necessary to increase the capacitance of the capacitor section, the first conductor 1 excluding the tip section 12 is used.
The area of 3 may be widened to widen the area facing the second conductor 19.

In the space 15, a material that easily discharges, for example, epoxy resin mixed with nickel particles or alumina powder, or ferrite added with a trace amount of metal components such as silver and cobalt, tin, etc. May be filled with a low material.

Further, by increasing the area covered by the pair of first conductors 13 with the first insulating sheet 11 and the dielectric sheet 18 and fixing the position of the first conductors 13, the pair of first conductors 13 is formed. Since the distance between the respective tip portions 12 of the conductor 13 is constant, it is possible to prevent discharge during normal load or no discharge during surge application, and obtain an effect that the discharge start voltage can be stabilized. To be

(Fifth Embodiment) The fifth embodiment of the present invention will be described below, particularly the inventions described in claims 8, 9, and 13.

FIG. 10A is a sectional view of an electronic component according to the fifth embodiment of the present invention, and FIG. 10 is a positional relationship between the pair of first conductors 13, the porous foam body 27, and the dielectric layer 28, which are the main parts. It is a top view which shows the outline of.

10 (a) and 10 (b), a pair of first conductors 13 are provided on both ends of the upper surface of the insulating substrate 26 so that their tip portions 12 face each other, and this pair of first conductors. A foamed porous body 27 provided in a substantially central portion of the upper surface of the insulating substrate 26 so as to cover the respective tip portions 12 of the conductor 13.
And a dielectric layer 28 provided on the upper surface of the first conductor 13,
A second conductor 19 provided on the upper surface of the dielectric layer 28;
A coating layer 29 is provided so as to cover at least the foamed porous body 27.

The insulating substrate 26 has a substantially rectangular shape and is made of an insulating material such as plate-like alumina.

The pair of first conductors 13 are provided at both ends of the upper surface of the insulating substrate 26 so that the tip portions 12 thereof face each other and do not contact each other, and have good conductivity such as silver, silver palladium, copper or the like. Made of different materials. Each tip 12 of the pair of first conductors 13 is provided in a substantially central portion of the insulating substrate 26 so as not to be exposed at the end face of the insulating substrate 26, and the other end 16 is exposed at the end face of the insulating substrate 26. Is provided. A terminal 30 is connected to each of the pair of first conductors 13.

Further, each tip portion 1 of the pair of first conductors 13
Between the two, a discharge gap 17 where discharge is generated when noise is applied
Has become. The size of the discharge gap 17, that is, the distance between the tip portions 12 of the pair of first conductors 13 may be changed depending on the magnitude of the surge.

Further, the tip portion 12 of the first conductor 13 is
It is thinner than the other parts of the first conductor 13. As a result, the current density at the tip portions 12 of the first conductors 13 can be increased when a surge is applied, so that an effect that discharges between the tip portions 12 are facilitated is obtained. That is, this effect can be expected when the tip 12 is thinner and sharper.

The foamed porous body 27 comprises a pair of first conductors 13.
Is provided in a substantially central portion of the upper surface of the insulating substrate 26 so as to cover the respective tip portions 12 of the.

When the foamed porous body 27 is heated, a large number of pores inside expand, so that the spatial density becomes large, and it becomes possible to discharge in this. That is, the first embodiment
The spaces 15 to 4 and the discharge space 15a have the same role. Therefore, the tip portions 12 of the pair of first conductors 13 are exposed in the foam porous body 27, and the discharge gaps 17 between the tip portions 12 are provided in the foam porous body 27. That is,
The foamed porous body 27 serves as a space 15 in the discharge gap 17 for reliable discharge. As the foamed porous body 27, a resin containing a solvent that evaporates when heated to form voids can be used. Further, instead of forming the foamed porous body 27, a through hole is provided in the dielectric layer 28, and this hole is formed into the space 15
May be

In order to prevent the discharge gap 17 from being exposed to the air, the foamed porous body 27 is attached to the insulating substrate 2.
It is provided at the substantially central portion of 6 to prevent the foamed porous body 27 from being exposed to the end surface of the insulating substrate 26.

The dielectric layer 28 is integrally provided so as to cover the upper surface of the first conductor 13 and the upper surface of the foamed porous body 27, and is made of a dielectric powder such as titanium oxide or barium titanate as a main material. It consists of a ceramic dielectric obtained by curing a body composition. In addition, you may provide separately so that only the upper surface of the 1st conductor 13 may be covered, respectively.

The second conductor 19 is provided on the upper surface of the dielectric layer 28 so as to face the first conductor 13 via the dielectric layer 28, and is made of a material having good conductivity such as silver, silver palladium or copper. Become. In addition, the second conductor 19 is an integral body and is provided so as not to be connected to the first conductor 13.

The second conductor 19, the first conductor 13 and the dielectric layer 28 form a capacitor section. That is, the dielectric layer 28 corresponds to the dielectric of the capacitor portion, and the second conductor 19 and the first conductor 13 formed via the dielectric layer 28 correspond to the counter electrodes of the capacitor, respectively.

The second conductor 19 is provided so as to face the pair of first conductors 13 in a top view. This is to obtain the capacitance value of the capacitor section.

The covering layer 29 is at least the foamed porous body 2.
7. The second conductor 19 is provided so as to cover the second conductor 19. At least the porous foam body 27 is covered with the covering layer 29 so as not to be exposed to the air. Further, the coating layer 29 is formed such that the upper surface and the lower surface thereof have a substantially rectangular shape,
The electronic component is a substantially rectangular parallelepiped.

The terminals 30 are respectively connected to the pair of first conductors 13 and are provided from the end surface of the insulating substrate 26 to the end surface of the covering layer 29, and the substantially rectangular parallelepiped electronic component can be surface-mounted. The terminal 30 is formed by printing a conductive material such as silver, and the surface thereof is tin-plated.

Further, as the terminal 30, a plate-shaped terminal made of a material having good conductivity and high strength such as copper and having a surface plated with tin may be used. At this time, the insulating substrate 26 may be bent by pressing and provided so as to extend from the end face to the lower face of the insulating substrate 26.

In the electronic component according to the fifth embodiment of the present invention described above, the foamed porous body 27 is provided in the substantially central portion of the upper surface of the insulating substrate 26 so as to cover the respective tip portions 12 of the pair of first conductors 13. Since it is covered with the covering layer 29, the periphery of the foamed porous body 27 is covered with the insulating substrate 26, the first conductor 13, and the covering layer 29, whereby the pair of foamed porous bodies 27 are covered. Each tip 12 of the first conductor 13 of
Is not exposed to the air, and the effect of preventing deterioration of the pair of first conductors 13 is obtained.

Note that, as shown in FIG. 8B, the other ends 16 of the pair of first conductors 13 may be provided at positions not facing each other.

As described in the fourth embodiment, two pairs of the first conductors 13 and two second conductors 19 may be provided in parallel with each other.

The equivalent circuit of the fifth embodiment is also the same as that of the second embodiment shown in FIG. 4, but the dielectric of the capacitor portions C1 and C2 is the dielectric layer 28.

A method of manufacturing an electronic component according to the fifth embodiment of the present invention will be described below.

In FIG. 10 (a), first, the tip ends 12 of the insulating substrate 26 made of an insulating material such as alumina having a substantially rectangular shape are made to face each other and do not contact each other. The pair of first conductors 13 is formed by plating or printing. A discharge gap 17 is formed between the tip portions 12.

The first conductor 13 is made of a material having good conductivity such as silver, silver palladium, copper, etc., and is made of a pair of first conductors 13.
Each of the front end portions 12 is formed at a substantially central portion of the insulating substrate 26 so as not to be exposed at the end surface of the insulating substrate 26, and the other end portion 16 is formed so as to be exposed at the end surface of the insulating substrate 26. further,
The tip portion 12 of the first conductor 13 is made thinner than the other portions of the first conductor 13.

Next, the insulating substrate 26 is covered with the foamed porous body 27 so as to cover the tip portions 12 of the pair of first conductors 13, respectively.
Is formed in the substantially central portion of the upper surface of the.

At this time, a pair of first porous materials are provided in the foamed porous body 27.
The respective end portions 12 of the conductors 13 are exposed to form the foamed porous body 27.
A discharge gap 17 between the tip portions 12 is formed therein. Further, in order to prevent the discharge gap 17 from being exposed to the air, the foamed porous body 27 is not exposed to the end surface of the insulating substrate 26.

Next, the dielectric layer 28, which is an integral body and is made of a ceramic dielectric obtained by curing a paste-like dielectric composition using dielectric powder such as titanium oxide or barium titanate as a main material, is formed into a first dielectric layer. The upper surface of the conductor 13 and the foamed porous body 27
Is formed so as to cover the upper surface of.

Next, the second conductor 19 made of a material having good conductivity such as silver, silver palladium, copper or the like is placed on the upper surface of the dielectric layer 28 so as to face the first conductor 13 via the dielectric layer 28. To form. Further, the second conductor 19 is an integral body and is not connected to the first conductor 13.

Next, the coating layer 29 made of epoxy resin, glass or the like is formed on at least the foamed porous body 27 and the second conductor 1.
It is formed so as to cover 9. At this time, the covering layer 29 prevents the foamed porous body 27 from being exposed to the air. The covering layer 29 is formed so that its upper surface and lower surface have a substantially rectangular shape.

Next, the terminal 30 is connected to the pair of first conductors 13
It is provided from the end surface of the insulating substrate 26 to the end surface of the coating layer 29 so as to be connected to each. As a result, it is possible to surface-mount an electronic component that is a substantially rectangular parallelepiped. The terminal 30 is formed by printing a conductive material such as silver, and the surface thereof is tin-plated.

Finally, heating and firing are performed to obtain the electronic component according to the fifth embodiment of the present invention.

The first conductor 13, the second conductor 19,
The foamed porous body 27, the dielectric layer 28, and the coating layer 29 may not be heated and fired at the same time, but may be separately heated and fired immediately after their formation. Further, when the foamed porous body 27 is heated, a large number of pores inside expand, so that the space density becomes large, and it becomes possible to discharge in this. Further, expansion of the foamed porous body 27 may cause a part of the upper surface of the substantially rectangular parallelepiped electronic component to project. Further, in order to make the electronic component a substantially rectangular parallelepiped, a depression may be provided in the upper surface of the coating layer 29 in advance.

By manufacturing in this way, the foamed porous body 27 is formed in the substantially central portion of the upper surface of the insulating substrate 26 so as to cover the respective tip portions 12 of the pair of first conductors 13, and the coating layer 29. After heating, the discharge space 15a is covered with
The insulating substrate 26, the first conductor 13, and the coating layer 29 cover the periphery of the foamed porous body 27, which becomes the front end portion 12 of the pair of first conductors 13 covered with the foamed porous body 27.
Is not exposed to the air, and the effect of preventing deterioration of the first conductor 13 is obtained.

In the fifth embodiment described above, the terminals 30 are described as being plate-like and provided so as to extend from the end surface to the lower surface of the insulating substrate 26. However, as in the case of chip type electronic components, printing or vapor deposition is performed. Alternatively, the terminal 30 may be provided. That is, the back surface electrodes are formed on both ends of the bottom surface of the insulating substrate 26, and the end surface electrodes are formed on the end surfaces of the insulating substrate 26 so as to be connected to the back surface electrode and the exposed first electrode 13. Further, the sheet-shaped insulating substrate 26
A dividing groove is previously formed on the back surface electrode and the first conductor 1.
3 may be divided into strips, the foamed porous body 27, the coating layer 29 and the like may be formed, and then the pieces may be further divided into individual pieces.

In the second to fifth embodiments of the present invention, as described in the first embodiment, the first conductor 13 is used.
The tip portion 12 of the first conductor 13 may be bent upward so that the tip portion 12 of the first conductor 13 is floated in the space 15. By doing so, the organic carbide in the space 15 generated by the discharge is applied to the first insulating sheet 11, the dielectric sheet 18, the insulating substrate 26, and the dielectric layer 28 on the upper and lower surfaces of the first conductor 13. The tips 12 of the pair of first conductors 13 for attaching
It is possible to prevent this from occurring between them, and thereby to prevent the insulation resistance of the discharge gap 17 between the tip portions 12 of the pair of first conductors 13 from decreasing, so that the discharge is performed with a load lower than a predetermined surge. Can be prevented, and the discharge voltage can be stabilized.

Furthermore, in the first to fifth embodiments of the present invention, by measuring the capacitance between the external electrodes 20 or the terminals 30, it is possible to easily inspect whether the pair of first conductors 13 is short-circuited.

Furthermore, although the electronic component provided with the capacitor has been described, a resistor or an inductor may be provided instead of the capacitor. At this time, both ends of the resistor portion and the inductor portion need to be connected to the external electrode 20 or the terminal 30.

[0162]

As described above, according to the present invention, the first insulating sheet having the space at the substantially central portion is provided between the second insulating sheets, and each of the pair of first conductors is provided in this space. Since the tip portion is provided, the space can be covered with the first insulating sheet and the second insulating sheet, so that each tip portion of the pair of first conductors provided in the space can be covered with air. An excellent effect that the deterioration of the first conductor can be prevented without being exposed to the inside is obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an electronic component according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an electronic component according to a second embodiment of the present invention.

FIG. 3A is a cross-sectional view taken along the line AA of FIG. 3, and FIG. 3B is a top view schematically showing the relationship between the space which is the main part and a pair of first conductors.

FIG. 4 is a diagram showing the equivalent circuit.

5 (a) and 5 (b) are a main part of another example and a space and a second.
Top view showing the outline of the relationship with the conductor

FIG. 6 is an exploded perspective view showing the other example.

FIG. 7 is an exploded perspective view showing an electronic component according to a third embodiment of the present invention.

FIG. 8A is a cross-sectional view taken along the line AA of FIG. 8B and is a top view showing a pair of first conductors, which is a main part of the other example.

FIG. 9A is an exploded perspective view showing an electronic component according to a fourth embodiment of the present invention, and FIG. 9B is a positional relationship among two pairs of a first conductor, a second conductor, a space, and an external electrode, which are the same main portions. Top view showing the outline of

FIG. 10A is a sectional view showing an electronic component according to a fifth embodiment of the present invention, and FIG. 10B is an upper surface showing an outline of a positional relationship among a pair of first conductors, a foam porous body, and a dielectric layer, which are the same main portions. Figure

FIG. 11A is a top view showing a conventional electronic component. (B) Bottom view of the same

FIG. 12 is a diagram showing the equivalent circuit.

[Explanation of symbols]

11 First insulating sheet 12 Tip 13 First conductor 14 Second insulation sheet 15 spaces 18 Dielectric sheet 18a Other dielectric sheets 19 Second conductor 23 Third conductor 24 holes 26 Insulating substrate 27 Foamed porous body 28 Dielectric layer 29 coating layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuo Oishi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (13)

[Claims] 1. A pair of first conductors are sandwiched between a plurality of first insulating sheets so that their tip portions face each other, and the tip portions of the pair of first conductors are connected to the plurality of first conductor sheets. An electronic component arranged in a space provided on at least one joint surface of the first insulating sheet. 2. The electronic component according to claim 1, wherein a tip portion of the first conductor is made thinner than other portions of the first conductor. 3. The electronic component according to claim 1, wherein the other ends of the pair of first conductors are provided at positions not facing each other. 4. The electronic component according to claim 1, wherein a tip portion of the first conductor is bent upward. 5. A first insulating sheet, a pair of first conductors provided at both ends of an upper surface of the first insulating sheet so that their tip portions face each other, and an upper surface of the first conductor. And a second conductor provided on the upper surface of the dielectric sheet, and a second insulating sheet provided on the upper surface of the second conductor and the lower surface of the first insulating sheet. And a space is provided in a substantially central portion of at least one of the first insulating sheet and the dielectric sheet that is in contact with the first conductor, and the space is provided in the space. An electronic component with each tip. 6. A third conductor and another dielectric sheet are provided between the first conductor and the first insulating sheet, and the third conductor is provided on the upper surface of the first insulating sheet. The electronic component according to claim 5, wherein the other dielectric sheets are respectively disposed on the upper surfaces of the conductors of No. 3. 7. The electronic component according to claim 5, wherein a hole that is continuous with the space is provided in at least one of the first insulating sheet and the dielectric sheet. 8. An insulating substrate, a pair of first conductors provided at both ends of an upper surface of the insulating substrate so that their tip portions face each other, and each tip portion of the pair of first conductors, respectively. A foamed porous body provided to cover substantially the center of the upper surface of the insulating substrate, a dielectric layer provided to the upper surface of the first conductor, and a second conductor provided to the upper surface of the dielectric layer. An electronic component comprising a coating layer provided so as to cover at least the foamed porous body. 9. The electronic component according to claim 8, wherein a tip portion of the first conductor is thinner than other portions of the first conductor. 10. A step of sandwiching a pair of first conductors between a plurality of first insulating sheets so that their tip portions face each other, and a space is formed in at least one of the plurality of first insulating sheets. A method of manufacturing an electronic component, comprising: a step; and a step of disposing the tip end portions of the pair of first conductors in a space provided on the first insulating sheet bonding surface. 11. The method of manufacturing an electronic component according to claim 10, wherein the first conductor is formed by plating. 12. A step of forming a pair of first conductors at both ends of the upper surface of the first insulating sheet so that their tip ends face each other, and a dielectric sheet is formed on the upper surface of the first conductor. A step of forming a second conductor on the upper surface of the dielectric sheet, an upper surface of the second conductor and the first
A step of forming a second insulating sheet on the lower surface of the insulating sheet, and a space is formed in a substantially central portion of at least one of the first insulating sheet and the dielectric sheet which is in contact with the first conductor. Forming a space, and in the space, the pair of first
A method for manufacturing an electronic component, wherein each tip of the conductor is formed. 13. A step of forming a pair of first conductors at both end portions of an upper surface of an insulating substrate so that the tip portions thereof face each other, and the insulating step so as to cover the tip portions of the pair of first conductors, respectively. A step of forming a foamed porous body on a substantially central portion of the upper surface of the substrate; a step of heating the foamed porous body;
An electronic component including a step of forming a dielectric layer on the upper surface of the conductor, a step of forming a second conductor on the upper surface of the dielectric layer, and a step of forming a coating layer so as to cover at least the foamed porous body. Manufacturing method.