JP2002222733A - Structure of capacitor element of solid-state electrolytic capacitor and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely reduce insulation breakage of a part of a dielectric film in an anode body in contact with a synthetic resin ring body when the ring body is attached to the joint of an anode wire on one end surface of the anode body. SOLUTION: This capacitor element comprises a porous anode body 2 which is made by sintering a valve action metallic powder, an anode wire 3 fitted to one end surface 2a of the anode body 2, a dielectric film 4, a solid-state electrolyte layer 5 and a cathode film 6 which are formed on the anode body 2, and a synthetic resin ring bodies 10 and 10' which are engaged and fitted with/to the joint of the anode wire 3. In this case, at least a part of the outer circumference of the ring bodies 10 and 10' is protruded from the side surface of the anode body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a capacitor element using a valve metal powder such as tantalum or niobium for an anode body, and a method of manufacturing the capacitor element. .

[0002]

2. Description of the Related Art A capacitor element used in a solid electrolytic capacitor of this type is manufactured as shown in FIGS.

[0003] First, as shown in FIG. 1, a valve metal powder such as tantalum is coated with a porous chip-type anode body 2.
Then, an anode wire 3 is fixed to one end face 2a of the anode wire 3 so that the anode wire 3 projects from the one end face, and is compacted.

[0004] Next, as shown in FIG.
By dipping in a chemical conversion solution B such as a phosphoric acid aqueous solution placed in a container A and performing an anodic oxidation treatment of applying a direct current to the anode body 2 in this state, as shown in FIG. 2, a dielectric film 4 made of tantalum pentoxide or the like having high insulation properties is formed on the surface of each valve metal powder, and the surface of the base of the anode wire 3 protruding from one end face 2a of the anode body 2 is also formed. Then, a dielectric film 4 'made of tantalum pentoxide having high insulating properties is formed.

Next, when the anodic oxidation treatment for forming the dielectric layers 4 and 4 ′ is completed, a ring body 10 made of a synthetic resin such as a fluororesin is attached to the base of the anode wire 3.
The ring body 10 is the one end face 2 of the dielectric film 4.
It is fitted and attached so as to substantially contact the portion a.

In this case, the ring body 10 is previously fitted and attached to the base of the anode wire 3 in the anode body 2, and then the anode body 2 is subjected to an anodic oxidation treatment to thereby form the dielectric film 4. There is also a method of forming.

Next, as shown in FIG. 4, the anode body 2 with the ring body 10 is placed in a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution placed in a container C up to the end face 2a of the anode body 2. By repeating dipping, withdrawing, and heating and firing a plurality of times (for example, about 10 times), as shown in FIG. 5, the solid electrolyte of manganese dioxide is formed on the surface of the dielectric layer 4 in the anode body 2. The layer 5 is formed.

As shown in FIG. 6, a cathode film 6 having a graphite film as a base and a metal film of silver or the like as an upper layer is formed on a portion of the surface of the anode body 2 other than the one end surface 2a. Thereby, the capacitor element 1 is obtained.

Prior to forming the solid electrolyte layer 5, the ring body 10 is fitted and attached to the base of the anode wire 3 because the anode body 2 is placed in a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution. One end face 2 of the anode body 2
When the solid electrolyte aqueous solution D passes through the dielectric film 4 and soaks into the portion of the anode wire 3 where the dielectric film is not formed when the dipping is performed to the portion a, the ring body 10 shows This is to prevent a defective product in which the cathode side and the anode side are electrically connected to each other due to the soaking of the solid electrolyte aqueous solution D.

As shown in FIG. 7, the capacitor element 1 is disposed between a pair of left and right lead terminals 7 and 8, and the anode wire 3 of the capacitor element 1 is connected to one anode lead terminal 7. On the other hand, while being fixed by welding or the like, the other cathode lead terminal 8 is electrically connected to the cathode film 6 of the anode body 2, and the whole thereof is sealed with a package body 9 made of synthetic resin. Assembled into an electrolytic capacitor.

[0011]

At the time of assembling the solid electrolytic capacitor, the anode wire 3 is welded to the anode lead terminal 7 at the base of the anode wire 3 of the capacitor element 1 with respect to the anode body 2. And the cathode film 6 in the capacitor element 1
When the cathode lead terminal 8 is connected to the ring member 10, a stress acting to bend the same will act, so that the ring body 10 attached to the base has the one end face 2 a of the anode body 2 due to the bending stress. Will be pressed. In addition, the ring body 9 is provided with the one end face 2a of the anode body 2 even when the package body 9 is molded.
Will be pressed.

In this case, conventionally, the ring body 10 has a small diameter so that the outer periphery of the ring body 10 does not protrude from the outer peripheral surface of the anode body 2. There was a problem as described above.

That is, when the ring body 10 is configured to have a small diameter, when forming the solid electrolyte layer 5 on the anode body 2, as shown in FIG. When the ring body 10 does not contact the solid electrolyte aqueous solution D when the one end face 2a of the anode body 2 is dipped in the aqueous solution D, the viscosity of the solid electrolyte aqueous solution is considerably high. Since the solid electrolyte aqueous solution D cannot be positively introduced between the one end face 2a of the anode body 2 and the ring body 10, the dielectric film 4 and the ring body 10 on the one end face 2a cannot be positively introduced. Formation of the solid electrolyte layer between the capacitor elements cannot be reliably achieved for all of the large number of capacitor elements.

[0014] Among the many capacitor elements, in the case where a solid electrolyte layer could not be formed between the dielectric film 4 and the ring body 10 on the one end face 2a, the above-mentioned post-manufacturing of the capacitor element was carried out. When assembling into a solid electrolytic capacitor or the like, the ring body 10 attached to the base of the anode wire 3 is directly pressed against the dielectric film 4 on one end surface 2a of the anode body 2 by bending stress and molding. By this, this one end face 2a
Breakage such as cracking or peeling occurs in the portion of the dielectric film in other words. In other words, dielectric breakdown occurs in the portion of the dielectric film 3 of the anode body 2 corresponding to the ring body 10. Was.

According to the present invention, when a ring made of synthetic resin is attached to the root of the anode wire at one end face of the anode body, dielectric breakdown occurs in a portion of the anode body in contact with the ring body of the dielectric film. It is an object of the present invention to surely reduce the number of operations.

[0016]

In order to achieve this technical object, a capacitor element according to the present invention is firstly provided with a "porous anode obtained by sintering a valve metal powder". Body, an anode wire fixed to one end surface of the anode body, a dielectric film formed on the anode body, a solid electrolyte layer and a cathode film, and a synthetic resin made of synthetic resin fitted and attached to the base of the anode wire. Secondly, in the capacitor element including the ring body, at least a part of the outer periphery of the ring body is configured to protrude from a side surface of the anode body. " A porous anode body obtained by sintering a working metal powder, an anode wire fixed to one end surface of the anode body, a dielectric film, a solid electrolyte layer and a cathode film formed on the anode body, and a root of the anode wire Fit to part In the capacitor element including the attached synthetic resin ring, an inclined surface is provided on one end face of the anode body from the ring body portion of the one end face toward the other end face of the anode body. " Are characterized.

In the method for manufacturing a capacitor element according to the present invention, first, as described in claim 3, "anode wire is fixed to one end face by a valve metal and fired to a porous anode body. And then forming a dielectric film on the anode body, and covering a ring portion made of a synthetic resin at the root of the anode wire such that at least a part of the outer periphery of the ring body protrudes from the side surface of the anode body. Fitting and mounting, and then forming a solid electrolyte layer on the anode body by dipping into a solid electrolyte aqueous solution, and then forming a cathode film on the anode body. " Secondly, as described in claim 4, "a porous anode body is formed by fixing an anode wire to one end face with a valve action metal and providing an inclined face toward the other end face at one end face. And then the anode body Process and base portion made of a synthetic resin ring member to be fitted, the anode wire to form a dielectric film
The method comprises the steps of mounting, then forming a solid electrolyte layer on the anode body by dipping into a solid electrolyte aqueous solution, and then forming a cathode film on the anode body. Third, as described in claim 5,
"Anode wire is fixed to one end face with a valve action metal and sintered into a porous anode body, and then, a dielectric film is formed on the anode body, and synthetic resin is attached to the base of the anode wire. A step of fitting and attaching a ring body made of aluminum, a step of attaching water to the whole of the anode body and the ring body, and a step of dipping a solid electrolyte aqueous solution into the anode body to which the water has been attached. Fourth, as described in claim 6, comprising a step of forming an electrolyte layer and a step of subsequently forming a cathode film on the anode body. "
"A step of fixing an anode wire to one end face with a valve metal and sintering it to a porous anode body, then a step of forming a dielectric film on the anode body, and a step of forming the anode wire at the base of the anode wire. A step of fitting and attaching a ring body made of a synthetic resin obtained by laminating a film soluble in water or a volatile organic solvent on the surface on one end side of the body, and then applying the film in the ring body to water or a volatile organic solvent. And a step of forming a solid electrolyte layer on the anode body by dipping in a solid electrolyte aqueous solution, and a step of forming a cathode film on the anode body. "
Each is characterized.

[0018]

According to the first and third aspects of the present invention, when a synthetic resin ring is fitted to and attached to the base of the anode wire fixed to one end surface of the anode, the ring is used. By forming at least a part of the outer periphery of the anode body so as to protrude from the side surface of the anode body, when forming the solid electrolyte layer on the anode body, the anode body is placed in a solid electrolyte aqueous solution such as a manganese nitrate aqueous solution. When the part of the ring body that protrudes from the anode body contacts the solid electrolyte aqueous solution when it is dipped to the one end face part, the solid electrolyte aqueous solution travels through the protruding part of the ring body and the one end face of the anode body Can be positively and positively introduced into the portion between the ring member and the ring member. Forming a solution electrolyte layer, it can be reliably achieved for all plurality of capacitor elements.

Further, as described in claims 2 and 4,
At one end surface of the anode body, by providing an inclined surface from the ring body portion of the one end surface toward the other end surface of the anode body, the anode body is formed by nitric acid at the time of forming the solid electrolyte layer on the anode body. When the anode body is dipped in a solid electrolyte aqueous solution such as a manganese aqueous solution to one end surface of the anode body, the solid electrolyte aqueous solution is positively applied to a portion between the one end face of the anode body and the ring body via the inclined surface. Since it can be reliably introduced, forming a solid electrolyte layer in the portion between the one end face and the ring body,
This can be reliably achieved for all of the multiple capacitor elements.

Furthermore, as described in claim 5, the anode body is fitted with and attached to the link body at the base of the anode wire on one end surface, and then water is attached to the entirety of the link body. Due to its low viscosity, water easily penetrates between one end face of the anode body and the ring body by capillary action. Therefore, when the anode body to which the water is attached is dipped in an aqueous solid electrolyte solution up to one end surface of the anode body, water contained between the one end surface and the ring body is added to the solid electrolyte aqueous solution. Will be sequentially permeated and replaced with the solid electrolyte aqueous solution,
Thereby, since the solid electrolyte aqueous solution can be positively and reliably introduced into the portion between the one end face and the ring body, it is possible to form the solid electrolyte layer in the portion between the one end face and the ring body. Can be reliably achieved for all of the multiple capacitor elements.

Alternatively, as set forth in claim 6, a synthetic resin in which a film soluble in water or a volatile organic solvent is laminated on the one end surface of the anode body at the base of the anode wire on one end surface of the anode body. -Made ring body
After mounting, a soluble film in the ring body is dissolved and removed with water or a volatile organic solvent to form a gap corresponding to the thickness of the film between one end surface of the anode body and the ring body. In this gap, when the anode body is dipped in the solid electrolyte aqueous solution up to the end face of the anode body, the solid electrolyte aqueous solution is positively introduced by a capillary phenomenon to reliably introduce a large amount of solid electrolyte. Therefore, the formation of the solid electrolyte layer in the portion between the one end face and the ring body can be reliably achieved for all of the plurality of capacitor elements.

In particular, in claim 6, claim 7
As described in the above, the film to be laminated on the ring body, a water-soluble film, without removing the water-soluble film, by dipping in the solid electrolyte aqueous solution, the water-soluble film, the solid electrolyte Since it can be dissolved and removed with an aqueous solution, the step of dissolving and removing the soluble film can be omitted.

Therefore, according to the present invention, as described above, the formation of the solid electrolyte layer on the one end face of the anode body between the dielectric film and the ring body is not required for all of the plurality of capacitor elements. Since this can be reliably achieved, there is an effect that the occurrence of dielectric breakdown in the dielectric film on one end surface of the anode body after the production of the capacitor element can be greatly reduced.

[0024]

Embodiments of the present invention will be described below.

FIG. 8 and FIG. 9 show the first embodiment.

In the first embodiment, reference numeral 2
Denotes a porous anode body formed by compacting a valve metal powder such as tantalum into a chip having a square cross section of one side W and then sintering it at a high temperature. One end face 2a has a porous anode body such as tantalum. An anode wire 3 made of a valve metal is fixed so as to protrude from one end face 2a.

The anode body 2 is dipped in a chemical conversion solution B such as a phosphoric acid aqueous solution placed in a container A, in the same manner as shown in FIG. 2, and a direct current is applied to the anode body 2 in this state. By performing an anodic oxidation treatment, a dielectric film 4 of tantalum pentoxide having a high insulating property is formed on the surface of each valve metal powder in the anode body 2, and protrudes from one end face 2 a of the anode body 2. A dielectric film 4 'made of tantalum pentoxide having high insulating properties is also formed on the surface of the base of the anode wire 3 to be formed.

Next, a ring 10 ′ made of synthetic resin such as fluororesin is attached to the base of the anode wire 3, and the ring 10 ′ is connected to the one end face 2 of the dielectric film 4.
It is fitted and attached so as to substantially contact the portion a.

It should be noted that a ring 10 'may be fitted and mounted in advance on the base of the anode wire 3 in the anode body 2, and then the dielectric film 3 may be formed. is there.

Therefore, in claims 3 to 6 of the appended claims, "the step of forming a dielectric film on the anode body and the step of fitting a ring body made of synthetic resin on the root of the anode wire.
The “attaching step” means to include a case where the order of each step is changed.

When the ring body 10 'is to be fitted and mounted on the base of the anode wire 3, the diameter G of the ring body 10' is substantially the same as the diagonal size of the square cross section of the anode body 2. By forming a round shape, the outer periphery of the ring body 10 ′ is configured to protrude from each of the four side surfaces of the anode body 2.

Next, the anode body 2 is placed in a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution placed in a container C in the same manner as that shown in FIG. The solid electrolyte layer 5 made of manganese dioxide is formed on the surface of the dielectric layer 4 of the anode body 2 by repeating dipping, lifting, and heating and firing a plurality of times (for example, about 10 times).

In forming the solid electrolyte layer 5, when the anode body 2 is dipped in a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution up to the end surface 2a of the anode body 2, the solid electrolyte aqueous solution D The ring body 1
0 ′, the portion protruding from the side surface of the anode body 2 comes into contact with the solid electrolyte aqueous solution D so that the ring body 1
0 ', the end face 2a of the anode body 2
Can be positively and positively introduced into a portion between the ring member 10a and the end surface 2a and the ring member 10 '.
The formation of the solid electrolyte layer in a portion between the capacitor elements can be reliably achieved for all of the plurality of capacitor elements.

The anode body 2 is thereafter
By forming a cathode film 6 having a graphite film as a base and a metal film of silver or the like as an upper layer on the surface of the solid electrolyte layer 5, a finished product of the capacitor element 1 is completed as shown in FIG.

In the first embodiment,
Instead of configuring the outer periphery of the ring body 10a to protrude from each of the four side surfaces of the anode body 2, only a part of the outer periphery of the ring body 10a may partially protrude from the side surface of the anode body 2. good.

Next, FIGS. 10 to 12 show a second embodiment.

In the second embodiment, reference numeral 2
Denotes a porous anode body formed by compacting a valve metal powder such as tantalum into a chip having a square cross section of one side W and then sintering it at a high temperature. One end face 2a has a porous anode body such as tantalum. An anode wire 3 made of a valve metal is fixed so as to protrude from one end face 2a.

When the anode body 2 is solidified and formed,
On one end surface 2a, an inclined surface 2a 'extending from a portion of the one end surface 2a where the anode wire 3 is fixed to the other end surface 2b of the anode body 2 is provided for each of four side surfaces of the anode body 2. Thereby, one end face 2 of the anode body 2
The portion at a has a substantially pyramid shape as shown in FIG.

The anode body 2 is dipped in a chemical conversion solution B such as a phosphoric acid aqueous solution, as in the case shown in FIG. 2, and an anodic oxidation treatment of applying a direct current to the anode body 2 is performed in this state. Thereby, a dielectric film 4 made of tantalum pentoxide having a high insulating property is formed on the surface of each valve action metal powder in the anode body 2 and one end face 2 of the anode body 2 is formed.
a on the surface of the base of the anode wire 3 protruding from
A dielectric film 4 'made of tantalum pentoxide having high insulating properties is formed.

Next, the anode body 2 is fitted and attached to the base of the anode wire 3 with a synthetic resin ring 10 having a diameter smaller than one side W of the anode body 2. In this embodiment, the order of the step of forming the dielectric film 4 and the step of fitting and mounting the ring body 10 may be interchanged.

Next, as shown in FIG. 13, the anode body 2 with the ring body 10 is dipped in a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution placed in a container C up to the end face 2 a of the anode body 2. By repeating withdrawing and heating and firing a plurality of times (for example, about 10 times), the surface of the dielectric layer 4 in the anode body 2
By forming a solid electrolyte layer 5 of manganese dioxide, and then forming a cathode film 6 on the surface of the solid electrolyte layer 5 with a graphite film as a base and a metal film such as silver as an upper layer, as shown in FIG. Thus, the finished product of the capacitor element is completed.

In forming the solid electrolyte layer 5, when the anode body 2 is dipped into a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution up to the end surface 2 a of the anode body 2, the solid electrolyte aqueous solution D is The inclined surface 2a '
Can be positively and positively introduced into the portion between the one end face 2a of the anode body 2 and the ring body 10 through the solid electrolyte layer in the portion between the one end face 2a and the ring body 10. The formation can be reliably achieved for all of the multiple capacitor elements.

In the second embodiment,
As described above, it is a matter of course that only one inclined surface may be provided instead of providing the four inclined surfaces 2a 'on the one end surface 2a.

FIGS. 14 and 15 show a third embodiment.

In the third embodiment, reference numeral 2
Denotes a porous anode body formed by compacting a valve metal powder such as tantalum into a chip having a square cross section of one side W and then sintering it at a high temperature. One end face 2a has a porous anode body such as tantalum. An anode wire 3 made of a valve metal is fixed so as to protrude from one end face 2a.

As in the case shown in FIG. 2, this anode body 2 is dipped in a chemical conversion solution B such as a phosphoric acid aqueous solution, and in this state, an anodic oxidation treatment of applying a direct current to the anode body 2 is performed. Thereby, a dielectric film 4 made of tantalum pentoxide having a high insulating property is formed on the surface of each valve action metal powder in the anode body 2 and one end face 2 of the anode body 2 is formed.
a on the surface of the base of the anode wire 3 protruding from
A dielectric film 4 'made of tantalum pentoxide having high insulating properties is formed.

Next, a ring body 10 made of a synthetic resin such as a fluororesin is attached to the base of the anode wire 3 such that the ring body 10 substantially contacts the portion of the dielectric film 4 at the one end face 2a. Fit and wear. In this embodiment, the order of the step of forming the dielectric film 4 and the step of fitting and mounting the ring body 10 may be interchanged.

Next, the anode body 2 and the ring body 10
Then, as shown in FIG. 15, water is attached by dipping or spraying water on the whole of the water, as shown in FIG.

Due to the adhesion of the water, the low-viscosity water reliably and easily enters the portion between the one end face 2a and the ring body 10 of the anode body 2 by the capillary action.

Then, the anode body 2 to which the water has been attached is placed in a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution in the same manner as shown in FIG.
The solid electrolyte layer 5 of manganese dioxide is formed on the surface of the dielectric layer 4 of the anode body 2 by repeating the dipping to the portion a, the withdrawal, and the heating and firing a plurality of times (for example, about 10 times). After that, a cathode film 6 having a graphite film as a base and a metal film such as silver as an upper layer is formed on the surface of the solid electrolyte layer 5, as shown in FIG. Finished.

At the time of forming the solid electrolyte layer 5, when the anode body 2 is dipped in a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution up to one end face 2a of the anode body 2, the anode body 2 The water contained in the portion between the body 10 and the solid electrolyte aqueous solution D sequentially permeates into the solid electrolyte aqueous solution D, thereby replacing the water with the solid electrolyte aqueous solution D. Since the solid electrolyte aqueous solution D can be positively and positively introduced into the portion, the formation of the solid electrolyte layer in the portion between the one end face 2a and the ring body 10 is required for all of the multiple capacitor elements. Can be reliably achieved.

In the third embodiment, it is needless to say that pure water from which impurities are removed as much as possible is preferably used as water adhering to anode body 2 and ring body 10. .

Next, FIGS. 16 to 18 show a fourth embodiment.

In the fourth embodiment, reference numeral 2
Denotes a porous anode body formed by compacting a valve metal powder such as tantalum into a chip having a square cross section of one side W and then sintering it at a high temperature. One end face 2a has a porous anode body such as tantalum. An anode wire 3 made of a valve metal is fixed so as to protrude from one end face 2a.

The anode body 2 is dipped in a chemical conversion solution B such as a phosphoric acid aqueous solution, as in the case shown in FIG. 2, and an anodic oxidation treatment of applying a direct current to the anode body 2 is performed in this state. Thereby, a dielectric film 4 made of tantalum pentoxide having a high insulating property is formed on the surface of each valve action metal powder in the anode body 2 and one end face 2 of the anode body 2 is formed.
a on the surface of the base of the anode wire 3 protruding from
A dielectric film 4 'made of tantalum pentoxide having high insulating properties is formed.

Next, as shown in FIG. 17, a ring body 10 made of a synthetic resin such as a fluororesin is attached to the base of the anode wire 3, and the ring body 10 is attached to the one end face 2 a of the dielectric film 4. Of the ring body 10, ie,
A water-soluble film 11 that is soluble in water, such as gelatin, is laminated on the one end surface 2a side.

The ring body 10 provided with the water-soluble film 11 is manufactured by using a material film in which the water-soluble film is preliminarily laminated on one side, and punching the material film with a punch. Is done. Also in this embodiment, the order of the step of forming the dielectric film 4 and the step of fitting and mounting the ring body 10 may be interchanged.

Then, the water-soluble film 11 in the ring body 10 fitted and attached to the anode wire 3 is dissolved and removed by washing with water such as dipping into water or spraying water. A gap H corresponding to the thickness t of the water-soluble film 11 is formed between the one end face 2a of the anode body 2 and the ring body 10 as shown in FIG. It is preferable to use pure water even when washing with water).

Therefore, similarly to the case shown in FIG. 4, the anode body 2 is provided with a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution.
In the inside, the anode body 2 is dipped to one end face 2a, pulled up, and heated and fired a plurality of times (for example, about 10 times), whereby the anode body 2
Forming a solid electrolyte layer 5 of manganese dioxide on the surface of the dielectric layer 4 in
By forming a cathode film 6 having a graphite film as a base and a metal film of silver or the like as an upper layer on the surface thereof, as shown in FIG. 6, a finished capacitor element is completed.

In forming the solid electrolyte layer 5, when the anode body 2 is dipped in a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution up to the end face 2 a of the anode body 2, the water-soluble film 11 Since the solid electrolyte aqueous solution D can be positively and considerably introduced into the gap H corresponding to the thickness t by capillary action, a solid electrolyte layer is provided at a portion between the one end surface 2a and the ring body 10. The formation can be reliably achieved for all of the multiple capacitor elements.

Incidentally, in the fourth embodiment,
Instead of the water-soluble film 11, a film soluble in a volatile organic solvent such as thinner or acetone may be used, and this film may be dissolved and removed with the volatile organic solvent. When the film 11 is formed, the film is dipped into a solid electrolyte aqueous solution D such as a manganese nitrate aqueous solution without passing through a washing step,
While dissolving and removing the water-soluble film 11 with the aqueous solid electrolyte solution, this portion, that is, the one end face 2
A solid electrolyte layer can be formed at the portion between the ring member a and the ring body 10.

Further, for example, either one or both of the second and third embodiments may be combined with the first embodiment, or the third embodiment may be combined with the third embodiment. To promote the above-described effects by appropriately combining at least two or more of the first to fourth embodiments, such as combining any one of the embodiments and the fourth embodiment. You can do it.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an anode body in a capacitor element.

FIG. 2 is a cross-sectional view showing a state where a dielectric film is formed on the anode body.

FIG. 3 is a vertical sectional front view of an anode body on which a dielectric film is formed.

FIG. 4 is a cross-sectional view showing a state where a solid electrolyte layer is formed on the anode body.

FIG. 5 is a vertical sectional front view of an anode body having a solid electrolyte layer formed thereon.

FIG. 6 is a vertical sectional front view of a capacitor element in which a dielectric film, a solid electrolyte layer, and a cathode film are formed on an anode body.

FIG. 7 is a vertical sectional front view of a solid electrolytic capacitor using the capacitor element.

FIG. 8 is a longitudinal sectional front view showing an anode body on which a dielectric film is formed in the first embodiment of the present invention.

FIG. 9 is a plan view of FIG. 8;

FIG. 10 is a vertical sectional front view of an anode body according to a second embodiment of the present invention.

FIG. 11 is an enlarged perspective view of the anode body of FIG. 10;

FIG. 12 is a vertical sectional front view showing an anode body on which a dielectric film is formed in the second embodiment.

FIG. 13 is a cross-sectional view showing a state where a solid electrolyte layer is formed on an anode body in the second embodiment.

FIG. 14 is a longitudinal sectional front view showing an anode body on which a dielectric film is formed in a third embodiment of the present invention.

FIG. 15 is a sectional view showing a state in which the anode body is dipped in water in the third embodiment.

FIG. 16 is a vertical sectional front view showing an anode body on which a dielectric film is formed according to a fourth embodiment of the present invention.

FIG. 17 is a longitudinal sectional front view showing a state where a ring body is mounted on an anode body in the fourth embodiment.

FIG. 18 is a longitudinal sectional front view showing a state where a gap is formed between an anode body and a ring body in the fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capacitor element 2 Anode body 2a One end face of anode body 3 Anode wire 4, 4 'Dielectric film 5 Solid electrolyte layer 6 Cathode film 10, 10' Ring body 11 Water-soluble film

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Aoyama 21 Ryoin-cho, Saiin-mizozaki-cho, Ukyo-ku, Kyoto-shi (72) Inventor Takahiro Nakamura 21-rope, Mizozaki-cho, Saiin-ku, Kyoto-shi, Rohm Co., Ltd.

Claims (7)

[Claims] 1. A porous anode body obtained by sintering a valve metal powder, an anode wire fixed to one end of the anode body, a dielectric film, a solid electrolyte layer and a cathode film formed on the anode body. A capacitor element comprising a synthetic resin ring fitted and attached to the base of the anode wire, wherein at least a part of the outer periphery of the ring is protruded from a side surface of the anode. The structure of the capacitor element in the solid electrolytic capacitor. 2. A porous anode body obtained by sintering valve metal powder, an anode wire fixed to one end surface of the anode body, a dielectric film, a solid electrolyte layer and a cathode film formed on the anode body. A ring element made of synthetic resin fitted and attached to the base of the anode wire, wherein one end face of the anode body, the other end face of the anode body from the ring body portion of the one end face The structure of a capacitor element in a solid electrolytic capacitor, characterized in that a slope is provided in the direction of. 3. A step of fixing an anode wire on one end face with a valve metal and sintering the porous anode body, a step of forming a dielectric film on the anode body, and a root of the anode wire. A step of fitting and attaching a ring body made of a synthetic resin to the part such that at least a part of the outer periphery of the ring body protrudes from the side surface of the anode body, and then dips the anode body into a solid electrolyte aqueous solution. And then forming a cathode film on the anode body. A method for manufacturing a capacitor element in a solid electrolytic capacitor, comprising the steps of: 4. A step of fixing an anode wire to one end face with a valve metal and sintering the porous anode body having an inclined face facing the other end face on one end face, and then sintering the anode body. A step of forming a dielectric film on the base and a step of fitting and attaching a ring body made of a synthetic resin to the base of the anode wire, and then forming a solid electrolyte layer on the anode body by dipping in a solid electrolyte aqueous solution. And then forming a cathode film on the anode body. A method for manufacturing a capacitor element in a solid electrolytic capacitor, comprising the steps of: 5. A step of fixing an anode wire to one end face with a valve metal and sintering the porous anode body, a step of forming a dielectric film on the anode body, and a root of the anode wire. A step of fitting and attaching a ring body made of a synthetic resin to the part, a step of attaching water to the entirety of the anode body and the ring body, and then applying the water to the anode body to which the water has been attached to the aqueous solid electrolyte solution. A method for manufacturing a capacitor element in a solid electrolytic capacitor, comprising: a step of forming a solid electrolyte layer by dipping; and a step of forming a cathode film on the anode body. 6. A step of fixing an anode wire to one end face with a valve metal and sintering the porous anode body, a step of forming a dielectric film on the anode body, and a root of the anode wire. A step of fitting and attaching a ring made of a synthetic resin obtained by laminating a film soluble in water or a volatile organic solvent on the surface on one end side of the anode body, and then applying the film in the ring body to water. Or a step of dissolving and removing with a volatile organic solvent, and then a step of forming a solid electrolyte layer on the anode body by dipping into a solid electrolyte aqueous solution, and then a step of forming a cathode film on the anode body A method for manufacturing a capacitor element in a solid electrolytic capacitor. 7. The method according to claim 6, wherein the film to be laminated on the ring body is a water-soluble film, and the film is dipped in the solid electrolyte aqueous solution without removing the water-soluble film. Of manufacturing a capacitor element in a solid electrolytic capacitor.