JP2001110677A - Aluminum electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum electrolytic capacitor which can solve the problem of server vibration stress, after it is mounted on a board which causes property deterioration and metal fatigue, followed by lead wire breakage and hence has a high strength against vibration stress after mounting. SOLUTION: After a pair of dummy lead wires 5a and 5b are placed along a line, crossing a line connecting between a pair of lead wires 2a and 2b, the metal case 3 of an aluminum electrolytic capacitor 6 is tightened and fixed by reduction sealing machining. With this constitution, the vibration of the capacitor after mounting can be suppressed, so that the aluminum electrolytic capacitor 6 having superior vibration-resistance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum electrolytic capacitor having excellent vibration resistance especially after mounting on a substrate.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 9, an aluminum electrolytic capacitor is formed by winding an anode foil and a cathode foil together with a separator to form a capacitor element 30, and the capacitor element 30 is impregnated with a driving electrolyte to form a bottomed cylinder. After being housed in the metal case 31, the lead wires 30 a and 30 b led out of the capacitor element 30 are passed through the sealing member 32, and then the open end of the metal case 31 is squeezed and sealed together with the sealing member 32. ing.

In order to improve the vibration resistance of an aluminum electrolytic capacitor having such a structure, the present inventors have disclosed in Japanese Patent Application No. 10-329040 a metal or resin material at the center of a capacitor element. A technique for preventing the vibration of the capacitor element by disposing a fixing rod and fixing the upper end of the fixing rod to a sealing member is proposed.

[0004]

However, in the above-mentioned conventional aluminum electrolytic capacitor, after mounting the aluminum electrolytic capacitor on the substrate, two lead wires 30 in particular are used.
When a strong vibration stress is applied in a direction of 90 ° to the line connecting a and 30b, the capacitor body 30 inside the product or inside vibrates like a pendulum, and the roots of the lead wires 30a and 30b cause metal fatigue. In the worst case. In particular, FIG.
It is considered that a chip-type capacitor in which the base portion of the lead wire 30c is bent as shown in FIG. Further, the same phenomenon may occur when the capacitor element 30 in the metal case 31 vibrates inside the metal case 31. The technique described in Japanese Patent Application No. 10-329040 proposed by the present inventors can suppress the vibration of the capacitor element inside the metal case, but does not have the effect of suppressing the vibration of the product body. Was something. In addition, in various electronic components, there has been a strong demand for improved vibration resistance, including applications for automotive electrical equipment.

The present invention solves such a conventional problem,
It is an object of the present invention to provide an aluminum electrolytic capacitor that can suppress vibration of a product body and vibration of a capacitor element in a metal case and has excellent vibration resistance after mounting on a substrate.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention relates to a sealing member for sealing an opening of a metal case containing a capacitor element, and a pair of leads led out through the sealing member. A pair of dummy leads are implanted on a line that intersects the line connecting the wires, and a ring-shaped drawing process is performed on the peripheral surface of the metal case so that the inner peripheral surface contacts the capacitor element. is there.

With this configuration, even when strong vibration stress is applied while the aluminum electrolytic capacitor is mounted on the board, the vibration of the capacitor element in the product body and the metal case can be suppressed, and the vibration resistance can be reduced. This makes it possible to obtain an aluminum electrolytic capacitor having excellent characteristics.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a capacitor formed by winding an anode foil and a cathode foil, to each of which an external lead wire is joined, with a separator interposed therebetween. Element, a bottomed cylindrical metal case containing the capacitor element impregnated with the driving electrolyte, and a metal case including a through hole through which a pair of lead wires led out from the capacitor element penetrates. An aluminum electrolytic capacitor having a structure in which a pair of dummy lead wires are implanted on a line intersecting a line connecting the pair of lead wires on the outer surface of the sealing member, In addition, the lead wires provided at four locations in the intersecting direction have an effect that the vibration of the product main body can be suppressed even when the vibration is applied from any direction.

According to a second aspect of the present invention, in the first aspect of the present invention, the depth of the pair of dummy leads implanted on the outer surface of the sealing member is at least equal to the opening of the metal case. It is of a configuration that is set so as to reach the drawing position of the metal case to be applied at the time of sealing, and has the effect that the effect according to the invention of claim 1 can be obtained more efficiently. .

According to a third aspect of the present invention, an anode foil and a cathode foil to which a lead wire for external lead-out and a dummy lead wire are joined are wound with a separator therebetween to connect the pair of lead wires. A capacitor element formed so that the lines connecting the pair of dummy leads intersect, a bottomed cylindrical metal case containing the capacitor element in a state of being impregnated with a driving electrolyte, and a capacitor element derived from the capacitor element An aluminum electrolytic capacitor having a through-hole through which a pair of lead wires and a dummy lead wire penetrate, and comprising a sealing member sealing an opening of the metal case, according to the invention of claim 1. It has the same action as the action.

According to a fourth aspect of the present invention, there is provided a capacitor element formed by winding an anode foil and a cathode foil, to each of which a lead wire for external lead-out is joined, with a separator interposed therebetween. An opening of the metal case was sealed with a bottomed cylindrical metal case housed in a state where the driving electrolyte was impregnated, and a through hole through which a pair of lead wires led out from the capacitor element penetrated. It is an aluminum electrolytic capacitor that is made of a sealing member and is formed by applying an annular drawing process on the peripheral surface of the metal case so that the inner peripheral surface is in contact with the capacitor element. Even if it is added, it has the effect that vibration of the capacitor element inside the metal case can be suppressed.

According to a fifth aspect of the present invention, there is provided a capacitor element formed by winding an anode foil and a cathode foil each having a lead wire for external lead-out bonded therebetween with a separator interposed therebetween, and An opening of the metal case was sealed with a bottomed cylindrical metal case housed in a state where the driving electrolyte was impregnated, and a through hole through which a pair of lead wires led out from the capacitor element penetrated. 5. An aluminum electrolytic capacitor comprising a sealing member, wherein the metal case is provided with a taper such that an inner diameter of a bottom portion of the metal case is equal to or smaller than an outer diameter of the capacitor element. It has the same function as the function according to the invention.

According to a sixth aspect of the present invention, there is provided a capacitor element formed by winding an anode foil and a cathode foil, to each of which an external lead wire is joined, with a separator interposed therebetween. A bottomed cylindrical metal case provided on the inner bottom surface with a projection to which the bottom surface of the capacitor element abuts while being housed in a state where the driving electrolyte is impregnated, and a pair of lead wires derived from the capacitor element penetrates. This is an aluminum electrolytic capacitor having a through-hole and a sealing member that seals the opening of the metal case, and has the same operation as the operation according to the fourth aspect of the present invention.

According to a seventh aspect of the present invention, there is provided a capacitor element formed by winding an anode foil and a cathode foil, to each of which an external lead wire is joined, with a separator interposed therebetween. An opening of the metal case was sealed with a bottomed cylindrical metal case housed in a state where the driving electrolyte was impregnated, and a through hole through which a pair of lead wires led out from the capacitor element penetrated. An aluminum electrolytic capacitor comprising a sealing member, a resin or metal fixing rod disposed at the center of the capacitor element, and at least one end of the fixing rod being coupled to an inner bottom surface of the sealing member or the metal case. Therefore, it has the same operation as the operation according to the fourth aspect of the present invention.

According to an eighth aspect of the present invention, in the first aspect of the present invention, a pair of lead wires derived from the capacitor element and a through hole through which a dummy lead wire passes are provided. An insulative seat plate is mounted on the open side of the metal case, and a pair of lead wires and dummy lead wires penetrating through the through hole of the seat plate are connected to the through hole. It has a configuration bent along the groove, and in addition to the effect of the invention according to any one of claims 1 to 3, it is possible to obtain a chip-type aluminum electrolytic capacitor excellent in surface mountability. Has an action.

According to a ninth aspect of the present invention, there is provided the insulating seat according to any one of the fourth to seventh aspects, wherein the insulating seat is provided with a through hole through which a pair of lead wires derived from the capacitor element passes. A configuration in which the plate is mounted on the open side of the metal case, and a pair of lead wires penetrating through the through hole of the seat plate is bent along the groove on the bottom surface of the seat plate provided to be connected to the through hole. And has the same operation as the operation according to the eighth aspect of the present invention.

According to a tenth aspect of the present invention, in the ninth aspect of the present invention, the bottom surface of the insulating seat plate mounted on the open side of the metal case intersects a line connecting a pair of lead wires. And a pair of dummy terminals is provided. In addition to the operation according to the ninth aspect of the present invention, even when vibration is applied from any direction, the vibration of the product body can be suppressed. .

[0018] The invention according to claim 11 is the invention according to claims 8 to 1
0, wherein an outer peripheral wall formed such that an inner peripheral surface is in contact with an outer peripheral surface of the metal case is formed on a peripheral edge of the insulating seat plate mounted on the open portion side of the metal case. This configuration is provided, and has the same operation as the operation according to the invention of any one of claims 8 to 10.

The invention according to claim 12 is the invention according to claims 8 to 1.
In the invention according to any one of the first to third aspects, at least one corner on the anode side of the insulating seat plate mounted on the open side of the metal case is chamfered,
This has the effect that the directions of the anode terminal and the cathode terminal can be easily recognized.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIGS. 1A and 1B are an exploded perspective view and a perspective view of an assembly showing an aluminum electrolytic capacitor according to a first embodiment of the present invention. 1 is a capacitor element formed by winding an anode foil and a cathode foil to which external lead wires 2a and 2b are respectively bonded, with a separator interposed therebetween.
Is a closed-end cylindrical metal case for accommodating the capacitor element 1, and 4 is a sealing member mounted on the opening of the metal case 3 to seal the metal case 3. A pair of through-holes 4a through which a pair of external lead wires 2a and 2b derived from
A pair of holes 4b for implanting a pair of dummy lead wires 5a and 5b is provided on an outer surface of the wire crossing a line connecting the lead wires 2a and 2b. The depth of the pair of holes 4b for implanting the dummy lead wires 5a and 5b is at least as far as the drawing position of the metal case 3 which is performed when sealing an opening of the metal case 3 described later. It is formed to reach.

After assembling the components configured as described above, as shown in FIG. 2B, the drawing portion 3a near the opening of the metal case 3 is curled from the outer periphery and mounted inside. The aluminum electrolytic capacitor 6 is sealed by reaching the sealing member 4.

In the aluminum electrolytic capacitor 6 according to the present embodiment thus configured, a pair of lead wires led out from the capacitor element 1 by implanting a pair of dummy lead wires 5a and 5b on the sealing member 4. 2a, 2b and a pair of dummy lead wires 5a, 5b are arranged in four directions at 90 degree intervals. After mounting this aluminum electrolytic capacitor 6 on a wiring board (not shown), vibration is applied from any direction. Even if it is, the vibration of the product body can be suppressed,
An aluminum electrolytic capacitor having excellent vibration resistance can be obtained.

(Embodiment 2) FIGS. 2 (a) and 2 (b) are an exploded perspective view and a perspective view of an assembly showing an aluminum electrolytic capacitor according to a second embodiment of the present invention. Reference numeral 1 denotes a capacitor element formed by winding an anode foil and a cathode foil to which external lead wires 2a and 2b and dummy lead wires 5a and 5b are joined, respectively, with a separator interposed therebetween. The pair of lead wires 2
The lines a and 2b and the dummy lead wires 5a and 5b intersect each other (that is, the lead wire 2a, the dummy lead wire 5a, the lead wire 2b, and the dummy lead wire 5b are arranged in four directions at 90 ° intervals). It is composed. Reference numeral 3 denotes a bottomed cylindrical metal case for housing the capacitor element 1;
Is attached to the opening of the metal case 3
The sealing member 4 has two pairs of through holes 4a through which a pair of external lead wires 2a and 2b and dummy lead wires 5a and 5b led out from the capacitor element 1 penetrate. , 4c.

After assembling the components configured as described above, the drawing portion 3a near the opening of the metal case 3 is curled from the outer periphery and mounted inside, as shown in FIG. The aluminum electrolytic capacitor 6 is sealed by reaching the sealing member 4.

The aluminum electrolytic capacitor 6 according to the present embodiment having the above-described structure has the same operation and effect as the aluminum electrolytic capacitor 6 according to the first embodiment, but includes dummy lead wires 5a and 5b. Is joined to the anode foil and the cathode foil, respectively, so that the strength is increased and an aluminum electrolytic capacitor having more excellent vibration resistance can be obtained.

(Embodiment 3) FIGS. 3A to 3G are exploded perspective views showing a structure of an aluminum electrolytic capacitor according to a third embodiment of the present invention. A capacitor element 1 formed by winding an anode foil and a cathode foil, to which lead wires 2a and 2b for use are respectively bonded, with a separator interposed therebetween is housed in a bottomed cylindrical metal case 3, With a configuration in which at least a part of the metal case 3 is in contact with the capacitor element 1,
The vibration of the capacitor element 1 in the metal case is suppressed, and will be described in detail below.

FIG. 3 (a) shows an annular drawing portion 7 provided in advance on a part of the peripheral surface of the metal case 3 so that the inner peripheral surface is in contact with the outer peripheral surface of the capacitor element 1. The vibration of the capacitor element 1 in the metal case 3 is suppressed by storing the capacitor element 1 in the metal case 3.

FIG. 3B shows that after the capacitor element 1 is stored in the metal case 3, an annular drawing portion 8 is provided on the peripheral surface of the metal case 3, so that the capacitor element 1 in the metal case 3 is provided. This is to suppress vibration.

FIG. 3C shows that the metal case 3 is provided with a taper 9 such that φD> φd, and the inner diameter of φd on the bottom surface is equal to or smaller than the outer diameter of the capacitor element 1. The vibration of the capacitor element 1 in the case 3 is suppressed.

FIG. 3D shows a vibration of the capacitor element 1 in the metal case 3 by providing a taper 10 such that the inner diameter of the bottom portion is in contact with the outer diameter of the capacitor element 1 only in the lower part of the metal case 3. Is to suppress.

FIGS. 3 (e) to 3 (g) show the projections 11, 1 on the inner bottom surface of the metal case 3 in contact with the bottom surface of the capacitor element 1. FIG.
By providing the components 2 and 13, the vibration of the capacitor element 1 in the metal case 3 is suppressed.

As described above, the aluminum electrolytic capacitor according to the present embodiment has a configuration in which at least a part of the inner surface of metal case 3 is in contact with capacitor element 1.
The aluminum electrolytic capacitor having excellent vibration resistance can be obtained by preventing the vibration of the capacitor element 1 in the metal case 3.

(Embodiment 4) FIGS. 4 (a) and 4 (b) are exploded perspective views showing the structure of an aluminum electrolytic capacitor according to a fourth embodiment of the present invention. A resin or metal fixing rod 14 is disposed at the center of the capacitor element 1 formed by winding an anode foil and a cathode foil, to which lead wires 2a and 2b for use are respectively joined, with a separator interposed therebetween. It is configured.

FIG. 4A shows a structure in which the upper end of a fixing rod 14 provided at the center of the capacitor element 1 is fixed by fitting it into a hole 15 provided on the back surface of the sealing member 4. FIG. 4B shows a state in which the lower end of the fixing rod 14 is joined to the inner bottom surface of the metal case 3 in advance.
4, the center of the capacitor element 1 is fitted therein. Thereafter, as shown in FIG.
The aluminum electrolytic capacitor 6 is obtained by drawing and sealing the upper end of the aluminum electrolytic capacitor 6.

With this configuration, vibration of the capacitor element 1 in the metal case 3 can be suppressed, and an aluminum electrolytic capacitor 6 having excellent vibration resistance can be obtained.

By fixing the upper end and the lower end of the fixing rod 14 to the sealing member 4 and the inner bottom surface of the metal case 3, respectively, it is possible to obtain the aluminum electrolytic capacitor 6 having more excellent vibration resistance. Needless to say.

(Embodiment 5) FIGS. 5A and 5B are a perspective view and a bottom view showing the structure of an aluminum electrolytic capacitor according to a fifth embodiment of the present invention. The aluminum electrolytic capacitor 6 having four leads described in the first or second embodiment with reference to FIG. 1 or FIG. 2 is provided with an insulating seat plate 16 attached to the opening side. Since the other configuration is the same as that of the first or second embodiment, the same reference numerals are given to the same portions, detailed description thereof will be omitted, and only different portions will be described below.

5 (a) and 5 (b), reference numeral 16 denotes an insulating seat plate. The seat plate 16 has a pair of external draw-outs led out through the sealing member 4 of the aluminum electrolytic capacitor 6. Dummy lead wire 5 of the same pair as lead wires 2a and 2b
Through holes (not shown) are provided through which the lead wires 2a and 2b and the dummy lead wires 5a and 5b led out to the back side of the seat plate 16 pass through the through holes. The terminal portion is formed by being bent along a groove (not shown) provided on the back surface side of the plate 16 so as to be connected to the through hole (not shown).

The seat plate 16 has a lead wire 2a on the side of the lead wire 2a.
A chamfered portion 7 is formed at one corner so that the anode and the cathode can be easily distinguished.

The thus constructed aluminum electrolytic capacitor according to the present embodiment, when mounted on a substrate, has a pair of lead wires 2a and 2b and a pair of dummy lead wires 5a and 5b.
Since the terminal portion made of is tightly bonded to the substrate, a surface-mount type aluminum electrolytic capacitor having excellent vibration resistance can be obtained.

(Embodiment 6) FIGS. 6A and 6B are a perspective view and a bottom view showing the structure of an aluminum electrolytic capacitor according to a sixth embodiment of the present invention. This is a configuration in which an insulating seat plate 16 is mounted on the opening side of the aluminum electrolytic capacitor 6 described with reference to FIG. 3 or 4 in the third or fourth embodiment. The same portions as those of the third or fourth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Only different portions will be described below.

6 (a) and 6 (b), reference numeral 16 denotes an insulating seat plate. The seat plate 16 has a pair of external draw-outs led out through the sealing member 4 of the aluminum electrolytic capacitor 6. A through hole (not shown) through which the lead wires 2a and 2b penetrate is provided.
The lead wires 2a and 2b led out to the back side of the base plate are bent along a groove (not shown) provided on the back side of the seat plate 16 so as to be connected to the through hole (not shown) to form a terminal portion. Configuration.

Further, a pair of dummy terminals 18a and 18b are provided on the back surface of the seat plate 16 so as to intersect with a line connecting the pair of lead wires 2a and 2b.
When the aluminum electrolytic capacitor configured as described above is mounted on a substrate, the terminal portion composed of the pair of lead wires 2a and 2b and the pair of dummy terminals 18a and 18b are closely bonded to the substrate, so that vibration resistance is improved. This makes it possible to obtain a surface-mount type aluminum electrolytic capacitor having excellent performance.

It should be noted that the chamfered portions 17 are formed at the two corners of the seat plate 16 on the lead wire 2a side in the fifth embodiment.
This is the same as the embodiment.

(Embodiment 7) FIGS. 7A and 7B are perspective views showing the structure of an aluminum electrolytic capacitor according to a seventh embodiment of the present invention. The seat plate 16 attached to the opening side of the aluminum electrolytic capacitor 6 described in the sixth embodiment with reference to FIG. 5 or FIG.
Is provided with an outer peripheral wall 19 formed so that the inner peripheral surface is in contact with the outer peripheral surface of the metal case 3 at the peripheral edge of the metal case 3. The other configurations are the same as those of the fifth or sixth embodiment. Therefore, the same portions are denoted by the same reference numerals, and detailed description thereof will be omitted. Only different portions will be described below.

FIG. 7A shows an outer periphery formed integrally with the periphery of an insulating seat plate 16 mounted on the opening side of the aluminum electrolytic capacitor 6 so that the inner peripheral surface is in contact with the outer peripheral surface of the metal case 3. The wall 19 is provided up to the same height as the metal case 3, and FIG. 7B shows a case where the height of the outer peripheral wall 19 is set to be slightly more than half the height of the metal case 3. .

With such a structure, an aluminum electrolytic capacitor having improved vibration resistance can be obtained.

After mounting the aluminum electrolytic capacitor of the present invention configured as described above on a board, as shown in FIG. 8, the amplitude is 7.5 mm in the X, Y, and Z directions with respect to the board, and the vibration acceleration : 30G, frequency: 5-400Hz, period: 8m
The result of having performed the vibration test on the vibration conditions of in is shown. The test confirmed (1) a change in appearance (whether or not lead wire breakage occurred) in a 15-minute 120-min test, and (2) a change in characteristics (leakage current change) in a 2-cycle 16 min. Also, as a sample, a φ16 × 20L product was used as a model, and a sample processed into a surface mount type considered to have a large influence of vibration was performed. 1 seat plate 1
6; (3) the seat plate 16 in the second embodiment; and (4) the seat plate 16 having the outer peripheral wall 19 having a height of １ ／ of the body height in the first embodiment. (5) A seat plate 16 having an outer peripheral wall 19 having a height half the height of the main body is attached to the first embodiment, and (6) A seat plate having an outer peripheral wall and a dummy terminal is attached to a conventional product. Test (2),
(1) Conventional product, (7) Embodiment 1, (8) Annular drawn portion 7 on the peripheral surface of metal case 3 in Embodiment 1, (9) Bottom portion of metal case 3 in Embodiment 1 (10) In the first embodiment, projections 11 to 13 are provided on the inner bottom surface of the metal case 3. (11) In the first embodiment, the fixing rod 14 is provided at the center of the capacitor element 1 and one end is provided. Was inserted into the sealing member 4 and fixed.

Table 1 shows the results of the test (1) performed as described above.

[0051]

[Table 1]

As is apparent from Table 1, the aluminum electrolytic capacitor according to the present invention has excellent vibration resistance.

The results of the test (2) are shown in (Table 2).

[0054]

[Table 2]

As is clear from Table 2, the aluminum electrolytic capacitor according to the present invention has a small characteristic deterioration and can exhibit stable performance.

[0056]

As described above, according to the present invention, it is possible to obtain an aluminum electrolytic capacitor which is less likely to be broken due to a strong vibration stress after mounting on a substrate and has a small characteristic deterioration and excellent vibration resistance.

[Brief description of the drawings]

FIG. 1 (a) is an exploded perspective view showing a configuration of an aluminum electrolytic capacitor according to a first embodiment of the present invention, and (b) is a perspective view of the assembly.

FIG. 2 (a) is an exploded perspective view showing a configuration of an aluminum electrolytic capacitor according to a second embodiment of the present invention, and (b) is a perspective view of the assembly.

FIG. 3 (a) is an exploded perspective view showing a configuration of an aluminum electrolytic capacitor according to a third embodiment of the present invention, in which an annular drawing process is performed on a peripheral surface of a metal case in advance, and (b) the same capacitor element is housed. (C), (d) Exploded perspective views of the metal case with a tapered surface (c)-(g) Inner bottom surface of the metal case Exploded perspective view of a projection provided on

FIG. 4 (a) is an exploded perspective view showing a configuration of an aluminum electrolytic capacitor according to a fourth embodiment of the present invention, and (b) is an exploded perspective view showing another example.

FIG. 5 (a) is a perspective view showing a configuration of an aluminum electrolytic capacitor according to a fifth embodiment of the present invention, and (b) is a bottom view of the same.

FIG. 6 (a) is a perspective view of an aluminum electrolytic capacitor according to a sixth embodiment of the present invention, and (b) is a bottom view of the same.

FIG. 7 (a) is a perspective view of an aluminum electrolytic capacitor according to a seventh embodiment of the present invention, and (b) is a perspective view of another example.

FIG. 8 is a perspective view showing a vibration direction during a vibration test.

FIG. 9A is an exploded perspective view showing a configuration of a conventional aluminum electrolytic capacitor. FIG. 9B is a cross-sectional view of the assembly.

FIG. 10 is a sectional view showing a configuration of a conventional aluminum electrolytic capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capacitor element 2a, 2b Lead wire 3 Metal case 3a, 7, 8 Drawing part 4 Sealing member 4a, 4c Through hole 4b, 15 Hole 5a, 5b Dummy lead wire 6 Aluminum electrolytic capacitor 9,10 Taper 11-13 Projection 14 Fixing rod 16 Seat plate 17 Chamfered portion 18a, 18b Dummy terminal 19 Outer peripheral wall

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Futa Tanaka 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (12)

[Claims] 1. A capacitor element formed by winding an anode foil and a cathode foil, to each of which an external lead wire is joined, with a separator interposed therebetween, and impregnating the capacitor element with a driving electrolyte. A closed-end tubular metal case housed in a closed state, and a sealing member provided with a through hole through which a pair of lead wires derived from the capacitor element penetrates and sealing an opening of the metal case. An aluminum electrolytic capacitor having a pair of dummy leads implanted on a line intersecting a line connecting the pair of leads on an outer surface of the member. 2. A planting depth of a pair of dummy lead wires planted on an outer surface of a sealing member reaches at least a drawing position of a metal case performed when sealing an opening of the metal case. The aluminum electrolytic capacitor according to claim 1, which is set as follows. 3. An anode foil and a cathode foil, to which a lead wire for external lead-out and a dummy lead wire are joined, are wound between the anode foil and the cathode foil with a separator therebetween to connect a wire connecting the pair of lead wires and a pair of dummy lead wires. A capacitor element formed so that the wires intersect, a bottomed cylindrical metal case containing the capacitor element in a state of being impregnated with a driving electrolyte, and a pair of lead wires derived from the capacitor element and An aluminum electrolytic capacitor comprising a sealing member provided with a through hole through which a dummy lead wire penetrates and sealing an opening of the metal case. 4. A capacitor element formed by winding an anode foil and a cathode foil, to each of which an external lead wire is joined, with a separator interposed therebetween, and impregnating the capacitor element with a driving electrolyte. A closed-end tubular metal case housed in a closed state, and a sealing member having a through hole through which a pair of lead wires led out of the capacitor element penetrates and sealing an opening of the metal case. An aluminum electrolytic capacitor with an annular drawing process applied to the case's peripheral surface such that the inner peripheral surface is in contact with the capacitor element. 5. A capacitor element formed by winding an anode foil and a cathode foil, to each of which an external lead wire is joined, with a separator therebetween, and impregnating the capacitor element with a driving electrolyte. A closed-end tubular metal case housed in a closed state, and a sealing member having a through hole through which a pair of lead wires led out of the capacitor element penetrates and sealing an opening of the metal case. An aluminum electrolytic capacitor with a case that is tapered so that the inner diameter of the bottom of the metal case is smaller than the outer diameter of the capacitor element. 6. A capacitor element formed by winding an anode foil and a cathode foil, to each of which an external lead wire is joined, with a separator therebetween, and impregnating the capacitor element with a driving electrolyte. A metal case having a bottomed cylindrical shape provided with a projection on the inner bottom surface, which contacts the bottom surface of the capacitor element, and a through hole through which a pair of lead wires led out from the capacitor element penetrates. Aluminum electrolytic capacitor consisting of a sealing member that seals the opening of the case. 7. A capacitor element formed by winding an anode foil and a cathode foil, to each of which an external lead wire is joined, with a separator interposed therebetween, and impregnating the capacitor element with a driving electrolyte. A metal case having a bottomed cylindrical shape housed in a closed state, and a sealing member having a through hole through which a pair of lead wires derived from the capacitor element penetrates and sealing an opening of the metal case, An aluminum electrolytic capacitor having a fixed rod made of resin or metal disposed at the center of the element and having at least one end of the fixed rod connected to the inner surface of the sealing member or the metal case. 8. An insulative seat plate provided with a through hole through which a pair of lead wires and a dummy lead wire led out from the capacitor element pass is mounted on the open side of the metal case, and the through hole of the seat plate is provided. 2. A pair of lead wires and dummy lead wires penetrating through are bent along grooves on the bottom surface of a seat plate provided to be connected to the through holes.
4. The aluminum electrolytic capacitor according to any one of items 1 to 3. 9. An insulating seat plate provided with a through hole through which a pair of lead wires led out of the capacitor element penetrates is mounted on the open side of the metal case, and a pair of through holes passing through the through hole of the seat plate is provided. The aluminum electrolytic capacitor according to any one of claims 4 to 7, wherein the lead wire is bent along a groove on the bottom surface of the seat plate provided to be connected to the through hole. 10. The aluminum electrolytic device according to claim 9, wherein a pair of dummy terminals are provided on the bottom surface of the insulating seat plate mounted on the open side of the metal case so as to intersect a line connecting the pair of lead wires. Capacitors. 11. An outer peripheral wall formed such that an inner peripheral surface is in contact with an outer peripheral surface of a metal case on a peripheral edge of an insulating seat plate mounted on an open portion side of the metal case. The aluminum electrolytic capacitor according to any one of the above. 12. The aluminum electrolytic cell according to claim 8, wherein at least one corner on the anode side of the insulating seat plate mounted on the open side of the metal case is chamfered. Capacitors.