JPH10144573A - Solid electrolytic capacitor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid electrolytic capacitor of large capacity in which lamination is possible surely in the same positional relation when planar capacitor elements are stacked, large mechanical stress is not applied, leak current of the solid electrolytic capacitor is not increased, and breakdown of the capacitor element is not generated. SOLUTION: An anode leading-out part 15 is collectively arranged on an electrode body 11 in a capacitor element 20. As the anode leading-out part 15, a bent part 18 and a connecting part 19 are arranged on a stretched portion of a part on which a resist film 13 for masking is formed. Independent comb terminals 22a, 22b are connected with a connecting part 19 of a cathode conducting layer 14 and the anode leading-out part 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid electrolytic capacitor using a conductive polymer as a solid electrolyte and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, the miniaturization and high frequency of electronic devices have been advanced, and solid electrolytic capacitors using conductive polymers as solid electrolytes capable of realizing low impedance at high frequency have been commercialized. ing. Since this solid electrolytic capacitor uses a conductive polymer with high conductivity as a solid electrolyte, its equivalent series resistance component is lower than that of a dry electrolytic capacitor using a conventional electrolytic solution or a solid electrolytic capacitor using manganese dioxide. , A large-capacity and small-sized solid electrolytic capacitor close to the ideal can be realized, so that various improvements have been made, and the capacitor has been gradually accepted in the market.

[0003] In addition, various kinds of conductive polymers have been developed for use as solid electrolytes, and application to solid electrolytic capacitors has been developed at a rapid pace.

In these solid electrolytic capacitors, when the capacitor element has a flat plate shape, an anodic oxide film is provided on the surface of a plate-like electrode body having a valve action, and at least a conductive film is formed on the anodic oxide film. A capacitor element having a solid electrolyte layer containing a conductive polymer, and further having a cathode conductor layer provided on the solid electrolyte layer; an anode lead portion provided integrally with the electrode body of the capacitor element; A portion provided with a masking resist film is provided, and a plurality of capacitor elements are overlapped and laminated so that the connection portions of the cathode conductor layer and the anode lead portion correspond to each other, and are separated from each other by a separate comb terminal. The volume efficiency of the capacity is increased by adopting a structure that connects to the capacitor.

In the above-mentioned conventional solid electrolytic capacitor, since the above-described structure is employed, a portion provided with a cathode conductor layer and a portion provided with a masking resist film provided as an anode lead portion are provided. Further, the thickness of the capacitor element in the anode lead-out portion provided integrally with the electrode body is different from each other.

In this case, the thickness of the capacitor element in the portion where the cathode conductor layer is provided and the thickness of the capacitor element in the portion where the masking resist film as the anode lead-out portion is formed may be substantially the same. Since it is possible, the difference in the thickness of the capacitor element in this portion does not need to be a problem, but the thickness of the capacitor element in the anode lead-out portion provided integrally with the electrode body is provided with the cathode conductor layer. Since the thickness becomes smaller by the thickness of the cathode conductor layer than the thickness of the capacitor element in the portion, a step is formed in this portion.

[0007] If a step formed here is connected to a comb terminal without stacking capacitor elements, a step is provided at the position of the comb terminal in the connection portion to thereby extract the capacitance of the capacitor element. Connection can be made to the portion of the conductor layer without applying mechanical stress.

However, when a plurality of capacitor elements are stacked, as shown in FIG. 14, the difference between the thickness of the portion of the cathode conductor layer 1 and the thickness of the anode lead portion 2 becomes large.
When the anode lead portions 2 are overlapped in correspondence with each other, a gap 3 at a constant interval is formed between the anode lead portions 2 by the thickness of the cathode conductor layer 1. In order to eliminate these gaps 3, conventionally, as shown in FIG. 14, a method of laminating a metal plate 4 having a thickness corresponding to the gaps 3 has been adopted.

[0009]

However, in the above-described structure of the conventional solid electrolytic capacitor, when the capacitor elements are stacked, the gap 3 is formed between the anode lead-out portions 2. Because it has a configuration of laminating the metal plate 4 with a thickness corresponding to
A metal plate 4 as an extra part is required, and as a result,
Since complicated steps are required in terms of structure and construction method, it is considered that it is industrially very difficult to perform the positioning of the capacitor element and the metal material to be sandwiched.

In the case of laminating without using the metal plate 4 as described above, the laminated capacitor elements cannot be surely overlapped in the same positional relationship because the thickness differs depending on the portion, and the gaps of the gaps are not limited. When a certain anode lead-out portion 2 is superposed under pressure, a large mechanical stress is applied to the cathode conductor layer 1 from which the capacitance of the capacitor is drawn out or to the portion 5 provided with the resist film for masking, and the capacitor The element may be bent or cut, increasing the leakage current of the solid electrolytic capacitor,
In the worst case, there has been a problem that the destruction of the capacitor element has occurred and a large-capacity laminated solid electrolytic capacitor cannot be formed.

The present invention solves the above-mentioned conventional problems. Even when plate-type capacitor elements are stacked, the stacked capacitor elements can be reliably stacked in the same positional relationship.
Also, even when the anode lead-out part with a gap is pressed and overlapped, a large mechanical stress is not applied to the part where the capacitance of the capacitor is drawn out and the part where the resist film for masking is applied. The purpose of the present invention is to provide a large-capacity solid electrolytic capacitor in which the capacitor element does not bend or break at a portion to increase the wetting current of the solid electrolytic capacitor or cause destruction of the capacitor element. is there.

[0012]

In order to achieve the above object, a solid electrolytic capacitor according to the present invention is provided with an anodic oxide film on the surface of a plate-like electrode body having a valve action,
A solid electrolyte layer containing at least a conductive polymer is provided on the anodic oxide film, and a capacitor element having a cathode conductor layer provided on the solid electrolyte layer is further provided. And a bent portion and a connecting portion are provided as an extension of the portion where the resist film for masking is applied as an anode lead portion, and a separate comb terminal is connected to a connection portion between the cathode conductor layer and the anode lead portion. According to this configuration, even when the flat-plate-type capacitor elements are stacked, the stacked capacitor elements can be reliably stacked in the same positional relationship, and the stacked anode drawers are pressed and overlapped. Large mechanical stress on the cathode conductor layer that draws out the capacitance of the capacitor and the part where the resist film for masking is applied. It is possible to provide a large-capacity solid electrolytic capacitor in which the capacitor element does not bend or break at that part and the leakage current of the solid electrolytic capacitor increases and the capacitor element does not break down. You can do it.

[0013]

According to the first aspect of the present invention, an anodic oxide film is provided on the surface of an electrode body made of a plate-shaped metal having a valve action, and at least a conductive material is provided on the anodic oxide film. A solid electrolyte layer containing molecules is provided, further comprising a capacitor element provided with a cathode conductor layer on the solid electrolyte layer, an anode lead portion is provided integrally with the electrode body in this capacitor element, and as this anode lead portion,
A bent portion and a connection portion are provided in an extended portion of the portion where the masking resist film is applied, and a separate comb terminal is connected to a connection portion between the cathode conductor layer and the anode lead portion. According to this configuration, Even when there is a step in the positional relationship of the separately connected comb terminals or when there is a difference in the thickness of the anode lead portion and the cathode conductor layer, a masking resist film is used as the anode lead portion. Since the bent portion is provided in the extension of the applied portion, the bent portion causes the capacitor element to be bent so as to absorb a step or a difference in thickness. Therefore, an increase in leakage current due to destruction or damage of the anodic oxide film, which is a dielectric of the capacitor element, can be prevented.

According to a second aspect of the present invention, a plurality of capacitor elements are stacked and arranged on a comb terminal, wherein the capacitor element is provided with an anode lead portion integrally with an electrode body, and the anode lead portion is provided with an anode lead portion. It has a configuration in which a bent portion and a connection portion are provided in an extension of the portion where the masking resist film is applied, and the connection portions of the cathode conductor layer and the anode lead portion in this capacitor element correspond to each other. When a plurality of capacitor elements are stacked one upon the other, the capacitor elements at the bent portion and the connection portion provided at the portion provided with the cathode conductor layer and at the extension of the portion provided with the masking resist film as the anode lead portion The thickness of the capacitor element at the anode lead-out part provided integrally with the electrode body is When the thickness of the cathode conductor layer is smaller than the thickness of the capacitor element in the portion where the pole conductor layer is provided, a step is formed in this portion. The difference between the thickness of the cathode conductor layer portion and the thickness of the anode lead portion is increased, and a gap is formed between the anode lead portions of the plurality of capacitor elements at a constant interval corresponding to the thickness of the cathode conductor layer. However, even if the anode drawer is pressed and overlapped in this state, the bent portion is provided in the extension of the portion where the resist film for masking is applied, so that the bent portion is laminated. Each of the capacitor elements will be bent at an appropriate angle so as to absorb the steps and thickness differences. Since no mechanical stress is applied to the cathode conductor layer even when connected to individual comb terminals, an increase in leakage current due to the destruction or damage of the anodic oxide film, which is the dielectric of the capacitor element, can be prevented. It is.

According to a third aspect of the present invention, at least the comb terminal on the anode side has a U-shaped cross section having rising portions on both sides, and a positioning portion engaging with the rising portion of the comb terminal is an anode lead portion. According to this configuration, the positioning portion that determines the position by contacting the rising portions on both sides of the U-shaped comb terminal is provided in the bending portion or the connection portion of the anode lead portion. Because of the presence of this positioning part, the positional relationship between the comb terminal and the capacitor element will be determined smoothly,
Thereby, when connected to the comb terminal, the bent portion of the anode lead-out portion can be arranged at a predetermined position. When the bending is performed after the capacitor element is arranged, the capacitor element can be arranged at a predetermined position, so that the bending shape can be processed into a predetermined shape.

According to a fourth aspect of the present invention, the shape of the positioning portion according to the third aspect is formed so as to fit into the rising portion of the comb terminal. According to this configuration, the position of the comb terminal and the position of the capacitor element are changed. Since the relationship is determined by the fitting portion, when the capacitor element is connected to the comb terminal, it is easy to arrange the bent portion of the anode lead portion at a predetermined position.

According to a fifth aspect of the present invention, similarly to the fourth aspect, the positioning portion of the third aspect is constituted by a concave portion into which the rising portion of the comb terminal is fitted.
Since the positional relationship between the comb terminal and the capacitor element is determined by fitting into the recess, when the capacitor element is connected to the comb terminal, the bent portion of the anode lead-out portion can be easily arranged at a predetermined position. .

According to a sixth aspect of the present invention, as the bent portion,
When a plurality of capacitor elements are cut and separated from a hoop material formed at the same time, one that is bent at a predetermined angle in advance is used. According to this configuration, after being bent in advance, it is arranged in parallel with a comb terminal. Because it can be mounted on the screen, production efficiency is improved.

According to a seventh aspect of the present invention, as the bent portion,
After the capacitor element is incorporated in the comb terminal, the one bent at a predetermined angle is used, and according to this configuration, the connection part side of the anode lead-out part generated when a plurality of capacitor elements are stacked. This has the effect that the cathode conductor layer can be bent into a predetermined shape in a state where the bent portions are laminated in accordance with the level difference on the connection portion side of the cathode conductor layer.

[0020] According to the present invention, an anodic oxide film is provided on the surface of an electrode body made of a metal having a valve action, and a solid electrolyte layer containing at least a conductive polymer is provided on the anodic oxide film. A capacitor element in which a cathode conductor layer is provided on the solid electrolyte layer, an anode lead portion is provided integrally with the electrode body of the capacitor element, and an extension of a portion where a masking resist film is applied as the anode lead portion is provided. In a method for manufacturing a solid electrolytic capacitor in which a bent portion and a connection portion are provided in a portion, and a separate comb terminal is connected to a connection portion between the cathode conductor layer and the anode lead portion, the capacitor element is incorporated in the comb terminal and then bent. As a means for bending the portion to a predetermined angle, the connection between the portion of the cathode conductor layer, the portion provided with the masking resist film, and the anode lead portion In order to bend the bent portion at a predetermined angle by pressing each separately and independently, it is subjected to bending using a holding jig of a divided structure, according to this manufacturing method, except for the bent portion When bending only the bent part while holding the part with a holding jig, the holding pressure of the cathode conductor layer part is reduced so that the stress is not applied to the capacitor element, while the masking jig has a divided structure. The resist pressure applied to the specified resist is reduced by pressing firmly so that the capacitor element does not move, and by reducing the pressing pressure so that the anode lead connection does not deform. It can be controlled. Also, when releasing the holding jig after bending, make sure to hold the connecting part of the anode lead-out part and the part where the resist film for masking is applied so that the cathode conductor layer adheres tightly to the comb terminal. After release, it is necessary to release the jig for holding down the cathode conductor layer with a delay, but even in such a case, the jigs having the divided structure are individually and individually held down to a predetermined angle. Can be bent.

According to a ninth aspect of the present invention, there is provided a method of manufacturing a solid electrolytic capacitor, wherein a plurality of capacitor elements are stacked and arranged on a comb terminal, and a bent portion is bent at a predetermined angle. Is applied to a case where a plurality of capacitor elements are stacked and arranged according to the contents of claim 8, and in this case, depending on the number of stacked capacitor elements, a portion of the cathode conductor layer or a resist film for masking is formed. The thickness of the applied portion and the connection portion of the anode lead-out portion will be different from each other, and the pressing position will also be different, however, even in such a case, the cathode conductor is divided by the holding jig having the divided structure. The layer part, the part where the masking resist film is applied, and the connection part of the anode lead-out part are individually and independently pressed to bend at a predetermined angle. It is, by the presence of the pressing jig divided structure, is capable of adjusting the height respectively held down to fit separately stacking number.

Next, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIGS. 1A and 1B show the configuration of a capacitor element of a solid electrolytic capacitor according to each embodiment of the present invention. First, a plate-like aluminum having a purity of 99.99%, which is a metal having a valve action, is shown. The electrode body 11 is formed in a continuous hoop shape, and the surface of the electrode body 11 is subjected to continuous electrolytic etching by a known method to roughen the surface. By performing the continuous chemical conversion such that the residence time in the chemical conversion tank was 30 minutes by applying the voltage of, an anodic oxide film 12 of aluminum oxide as a dielectric was formed on the surface of the electrode body 11.

The continuous hoop-shaped electrode body 11 produced in this manner is punched into a predetermined shape, and thereafter, FIG.
(A) As shown in (b), a masking resist film 13 made of a polyimide adhesive tape is continuously attached to a predetermined position from both the front and back sides of the electrode body 11 to form the cathode conductor layer 1.
4 and an anode lead-out section 15.

Next, a voltage of 59 V is applied again to the punched cross section of the continuous hoop-shaped electrode body 11 in an aqueous solution of ammonium adipate having a concentration of 3% so that the residence time in the formation tank is 30 minutes. After continuous formation of a cross section, the conductive polymer of polypyrrole is homogeneously immersed in an aqueous solution containing 0.1 mol of pyrrole and 0.15 mol of alkylnaphthalene sulfonate and subjected to continuous electrolytic polymerization. To form a solid electrolyte layer 16.

A cathode conductor layer 14 composed of a carbon paint layer and a silver paint layer was formed on the solid electrolyte layer 16 to form a continuous hoop-shaped capacitor element 17 as shown in FIG.

(Embodiment 1) FIG. 3 shows an internal structure of a solid electrolytic capacitor according to Embodiment 1 of the present invention. FIG. 2 shows a continuous hoop-shaped capacitor element 17 configured as described above. As shown in the drawing, the anode lead-out portion 15 is punched out by a die in a shape such that a bent portion 18 and a connection portion 19 are provided in an extended portion of a portion where a polyimide adhesive tape which is a masking resist film 13 is applied. Element 20 was formed. After this, the capacitor element 2
Then, the bending portion 18 is bent so as to absorb the difference in level and thickness, and then the connection portion 19 of the anode lead portion 15 of the capacitor element 20 is connected to the anode side by laser welding 21 as shown in FIG. And the cathode conductor layer 14 is coated with silver paint on the cathode side of the comb terminal 2a.
2b.

(Embodiment 2) FIG. 4 shows the internal structure of a solid electrolytic capacitor according to Embodiment 2 of the present invention.
In the second embodiment, four capacitor elements 20 according to the first embodiment of the present invention are stacked to form a pair of comb terminals 22a,
The bent portion 18 is bent so as to absorb a step difference and a thickness difference between the respective capacitor elements 20 in the same manner as in the first embodiment of the present invention except that it is connected to 22b.

(Embodiment 3) FIGS. 5 (a) and 5 (b) show the internal structure of a solid electrolytic capacitor according to Embodiment 3 of the present invention. This Embodiment 3 is a continuous hoop-shaped capacitor element. As shown in FIG. 6, as shown in FIG. 6, the anode drawing part 15 has a shape in which a bent part 18, a positioning part 23, and a connecting part 19 are provided in an extension of a part where a polyimide adhesive tape which is a masking resist film 13 is applied. The individual capacitor elements 20 are formed by punching with a mold.

The anode-side comb terminal 22a has a U-shaped cross section having rising portions 24 on both sides, and the positioning portion 2 is provided on the rising portion 24 of the comb terminal 22a.
3 are brought into contact with each other, and four capacitor elements 20 are stacked.
The positional relationship was fixed. Thereafter, the bending process of the bending portion 18 is performed so that the capacitor element 20 absorbs the step and the thickness difference, and the cathode conductor layers 14 of the four capacitor elements 20 stacked are shown in FIG. As shown, it is connected to the comb terminal 22b on the cathode side with silver paint, and the connection portion 19 of the anode lead-out portion 15 has a rising portion 24 having a U-shaped cross section.
Was bent so as to enclose the connecting portion 19, and was connected to the anode-side comb terminal 22 a by laser welding 21.

(Embodiment 4) As shown in FIG. 7, a continuous hoop-shaped capacitor element 17 is formed as an anode lead-out portion 15 by bending a portion 18 extending from a portion provided with a polyimide adhesive tape which is a resist film 13 for masking. And, the individual capacitor elements 20 are formed by punching out with a mold such that the shape of the positioning portion 23 becomes a concave portion 25 into which the rising portion 24 of the comb terminal 22a on the anode side is fitted. By fitting the rising portions 24 of the comb terminals 22a, the positional relationship between the four capacitor elements 20 stacked on the comb terminals 22a was fixed. Thereafter, the bent portion 18 is bent so that the capacitor element 20 absorbs the step and the thickness difference, and then the laminated 4
As shown in FIG. 8 (a), the cathode conductor layer 14 in each of the capacitor elements 20 is made of silver paint to form a comb terminal 2 on the cathode side.
2b, and the connecting portion 19 of the anode lead-out portion 15 was bent so that the rising portion 24 having a U-shaped cross section wrapped the connecting portion 19, and then connected to the anode-side comb terminal 22a by laser welding 21.

(Embodiment 5) At the same time as the continuous hoop-shaped capacitor elements 17 are punched into the respective capacitor element shapes by a die for simultaneously punching a plurality of capacitor element shapes according to Embodiments 2 to 4 of the present invention, FIG.
As shown in the side views of (a) to (d), after bending the bent portion 18 into a predetermined shape of the capacitor element 20 of each layer in advance, FIG. 4, FIG. 5 (a), (b) and FIG. )
As shown in (b), a plurality of separate comb terminals 22a, 22
The capacitor element 20 of a multilayer body was formed by sequentially laminating and connecting the capacitor elements 2b simultaneously.

The single or laminated capacitor element 20 according to the first to fifth embodiments of the present invention connected to the pair of comb terminals 22a and 22b is made of epoxy resin as shown in FIG. After molding by transfer molding using the exterior resin 26, terminal processing and aging treatment were performed to form a solid electrolytic capacitor 27.

(Comparative Example) As shown in FIG. 11, the continuous hoop-shaped capacitor element 17 was
The anode lead-out portion 15 is directly provided without providing the bent portion 18 as in the embodiment of the present invention on the extension of the portion where the polyimide adhesive tape which is the masking resist film 13 is applied.
A solid electrolytic capacitor was formed in the same manner as in the third embodiment of the present invention except that individual capacitor elements 20 were formed by punching out with a mold into a shape provided with the connecting portion 19.

Table 1 shows the measured capacitor characteristics (capacitance value, tan δ value, leakage current value) of each of the first to fourth embodiments of the present invention and the comparative example after aging of 100 capacitors. It shows the average value and the characteristic failure rate.

[0035]

[Table 1]

As is clear from Table 1, the capacitor element 20 of the solid electrolytic capacitor in the comparative example has the structure shown in FIG.
As shown in FIG. 5, since there is no bent portion 18 as in the embodiment of the present invention, mechanical stress is applied to the polyimide adhesive tape or the cathode conductor layer 14 which is the resist film 13 for masking the capacitor element 20, Anode drawer 1
5, the connection portion 19 is disconnected, and the defect rate increases,
And even if it was a non-defective product, the level of the leakage current was high. On the other hand, the characteristic of the solid electrolytic capacitor 27 formed by using the capacitor element 20 according to the first to fifth embodiments of the present invention is that the mechanical stress is directly applied to the capacitor element 20 since the solid electrolytic capacitor 27 has the bent portion 18. However, the leakage current is stable.
Embodiments 3 and 4 of the present invention provided with positioning portion 23
Has a low rejection rate, indicating that stable manufacturing can be achieved.

(Embodiment 6) Next, in order to realize Embodiments 1 to 5 of the present invention, as a method of bending the bent portion 18 into a predetermined shape, a cathode conductor layer 14 and a resist film for masking are used. A pressing jig having a divided structure as shown in FIG. 12 so that the portion 13 provided with the polyimide adhesive tape and the connecting portion 19 of the anode lead-out portion 15 can be individually and independently bent to a predetermined angle. Tool 2
8 was used for bending.

That is, the holding portion 29 of the cathode conductor layer 14
And an upper die 33 having a split type pressing part in which the pressing part 30 of the resist film 13 and the pressing part 31 of the anode lead-out part 15 control the pressing pressure by independent springs 32, the cathode conductor layer 14, and the resist film. 13. A lower mold 34 in which the height of a portion corresponding to each of the anode lead-out portions 15 is changed, wherein only the bent portion 18 is bent while holding a portion other than the bent portion 18 with a holding jig 28. It is. In this case, the pressure of the cathode conductor layer 14 is reduced so that stress is not applied to the capacitor element 20, and the part of the polyimide adhesive tape which is the masking resist film 13 is the capacitor element 2.
A pressing jig 28 that controls the pressing pressure for each predetermined portion is used, for example, the pressing force is strongly held so that the 0 does not move, and the pressing pressure is reduced so that the connecting portion 19 of the anode drawer 15 does not deform. Bending process.

When the holding jig 28 is released from the capacitor element 20 after this bending, the anode lead-out portion 15 is so placed that the cathode conductor layer 14 is in close contact with the cathode-side comb terminal 22b without any gap. Resist film 1 made of polyimide holding tape 31 or polyimide adhesive tape
After releasing the pressing portion 30 of No. 3 from the capacitor element 20, the bent portion 18 was processed into a predetermined bent shape in a procedure of releasing the pressing portion 29 of the cathode conductor layer 14 with a delay in time. FIG. 13A is a side view showing a stacked state of four capacitor elements 20 before bending, and FIG. 13B is a side view showing a stacked state of four capacitor elements 20 after bending. It is the side view shown. By using the holding jig 28 having such a divided structure, the laminated capacitor element 20 can be bent into a predetermined shape while minimizing the mechanical stress applied to the capacitor element 20. Also, by adjusting the height of each holding jig 28, a bent shape corresponding to the predetermined shape of the capacitor element 20 of each layer shown in FIGS. 9A to 9D could be created.

It is to be noted that the holding jig 28 having the divided structure described above.
Is applied to a structure in which the four stacked capacitor elements 20 are connected to a pair of comb terminals 22a and 22b. However, after cutting from the continuous hoop-shaped capacitor element 17, individual capacitor elements 20 are formed, After the individual capacitor element 20 is bent at a predetermined angle by a holding jig 28 having a structure divided in advance at the station, the individual capacitor element 20 is connected to the pair of comb terminals 22a and 22b. It goes without saying that the holding jig 28 having a divided structure can be used.

Further, in the first to sixth embodiments of the present invention, the method for forming the solid electrolyte layer 16 and the material and the method for forming the electrode body 11 have been described with specific examples. The content is not limited to this.
Regarding the shape of the electrode body 11, the structures of the positioning portion 23 and the bent portion 18 are not limited to the above shapes. Here, in the embodiment of the present invention, the bent portion 1 is used from the viewpoint of positioning and securing the bent portion described in the embodiment of the present invention.
It is considered that the length of the electrode 8 is preferably equal to or greater than the thickness of the cathode conductor layer 14. Does not depart from the scope of the claims.

[0042]

As described above, in the solid electrolytic capacitor of the present invention, an anodic oxide film is provided on the surface of a plate-like electrode body having a valve action, and at least a conductive polymer is formed on the anodic oxide film. A capacitor element having a solid electrolyte layer including a cathode conductor layer provided on the solid electrolyte layer, and an anode lead portion provided integrally with the electrode body of the capacitor element, and the anode lead portion being used for masking. A bent portion and a connection portion are provided in an extension of the portion where the resist film is applied, and a separate comb terminal is connected to a connection portion between the cathode conductor layer and the anode lead portion. According to this configuration, Even if there is a step in the positional relationship of the comb terminals connected to the or if there is a difference in the thickness of the anode lead-out part and the cathode conductor layer,
Since the bent portion is provided as an extension of the masking resist film as the anode lead portion, the capacitor element is bent by this bent portion so as to absorb the difference in level and thickness. Thus, no mechanical stress is applied to the cathode conductor layer, so that an increase in leakage current due to destruction or damage of the anodic oxide film serving as a dielectric of the capacitor element can be prevented.

[Brief description of the drawings]

FIG. 1A is a plan view showing a continuous hoop configuration of a capacitor element of a solid electrolytic capacitor according to each embodiment of the present invention. FIG. 1B is a cross-sectional view taken along line AA ′ in FIG.

FIG. 2 is a plan view showing the shape of the capacitor element according to the first embodiment of the present invention.

FIG. 3 is a perspective view when a capacitor element according to the first embodiment of the present invention is connected to a comb terminal;

FIG. 4 is a perspective view when a capacitor element according to a second embodiment of the present invention is connected to a comb terminal;

5A is a perspective view when a capacitor element according to a third embodiment of the present invention is connected to a comb terminal. FIG. 5B is a cross-sectional view taken along line BB ′ in FIG.

FIG. 6 is a plan view showing a shape of a capacitor element according to a third embodiment of the present invention.

FIG. 7 is a plan view showing a shape of a capacitor element according to a fourth embodiment of the present invention.

8A is a perspective view when a capacitor element according to a fourth embodiment of the present invention is connected to a comb terminal. FIG. 8B is a cross-sectional view taken along line CC ′ in FIG.

9A to 9D are side views showing side shapes of first to fourth capacitor elements according to the fifth embodiment of the present invention;

FIG. 10 is a perspective view showing an appearance of a completed solid electrolytic capacitor in Embodiments 1 to 5 of the present invention and a comparative example.

FIG. 11 is a plan view showing the shape of a capacitor element in a comparative example.

FIG. 12 is an explanatory diagram showing a structure of a holding jig according to a sixth embodiment of the present invention.

13A is a side view showing a stacked state of capacitor elements before bending a bent portion according to the sixth embodiment of the present invention. FIG. 13B is a diagram showing a state after bending the bent portion according to the sixth embodiment of the present invention. Side view showing the laminated state of the capacitor element of FIG.

FIG. 14 is a side view showing a state of lamination of capacitor elements for explaining a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Electrode body 12 Anodized film 13 Resist film for masking 14 Cathode conductor layer 15 Anode lead-out part 16 Solid electrolyte layer 18 Bent part 19 Connection part 20 Capacitor element 22a, 22b Com terminal 23 Positioning part 24 Rising part 25 Depression 28 Press jig

Claims (9)

[Claims] An anodic oxide film is provided on the surface of a plate-shaped electrode body having a valve action, and a solid electrolyte layer containing at least a conductive polymer is provided on the anodic oxide film.
Further, a capacitor element having a cathode conductor layer provided on the solid electrolyte layer is provided, an anode lead portion is provided integrally with the electrode body of the capacitor element, and a portion of the anode lead portion provided with a masking resist film as a mask. A solid electrolytic capacitor in which a bent portion and a connection portion are provided in an extension portion, and a separate comb terminal is connected to a connection portion between the cathode conductor layer and the anode lead portion. 2. The solid electrolytic capacitor according to claim 1, wherein a plurality of capacitor elements are stacked on the comb terminal. 3. A comb terminal at least on the anode side having a U-shaped cross section having rising portions on both sides, and a positioning portion engaging with the rising portion of the comb terminal is provided on a bent portion or a connection portion of the anode lead portion. The solid electrolytic capacitor according to claim 1, wherein the solid electrolytic capacitor is provided. 4. The solid electrolytic capacitor according to claim 3, wherein the positioning portion is dimensioned so as to fit into the rising portion of the comb terminal. 5. The solid electrolytic capacitor according to claim 3, wherein the positioning portion is constituted by a concave portion into which the rising portion of the comb terminal is fitted. 6. The solid according to claim 1, wherein the bent portion is formed by bending a predetermined angle in advance when cutting and separating from a hoop material simultaneously forming a plurality of capacitor elements. Electrolytic capacitor. 7. The solid electrolytic capacitor according to claim 1, wherein the bent portion is formed by incorporating a capacitor element into a comb terminal and then bent at a predetermined angle. 8. An anodic oxide film is provided on the surface of an electrode body made of a metal having a valve action, a solid electrolyte layer containing at least a conductive polymer is provided on the anodic oxide film, and a cathode is provided on the solid electrolyte layer. A capacitor element provided with a conductor layer is provided, and an anode lead portion is integrally provided on an electrode body of the capacitor element, and a bent portion and a connection portion are formed on an extension of a portion where a resist film for masking is applied as the anode lead portion. In the method for manufacturing a solid electrolytic capacitor in which a separate comb terminal is connected to a connection portion between the cathode conductor layer and the anode lead portion, after the capacitor element is incorporated in the comb terminal, the bent portion is bent to a predetermined angle. As means, the portion of the cathode conductor layer, the portion where the masking resist film is applied, and the connection portion of the anode lead portion are individually and independently provided. A method for manufacturing a solid electrolytic capacitor, wherein bending is performed using a holding jig having a divided structure so that a bent portion can be bent at a predetermined angle. 9. The method for manufacturing a solid electrolytic capacitor according to claim 8, wherein a plurality of capacitor elements are stacked and arranged on the comb terminal, and then the bent portion is bent at a predetermined angle.