CN1971785B - electrolytic capacitor - Google Patents

Abstract

The present invention provides an electrolytic capacitor with stable and reducible equivalent series resistance. The electrolytic capacitor (10) comprises two anode foils (1a, 1b), two cathode foils (2a, 2b), four separators (3a, 3b, 3c, 3d), lead extraction terminals (6-9), anode leads (11, 12), and cathode leads (13, 14). Furthermore, the two anode foils (1a, 1b), the two cathode foils (2a, 2b), and the four separators (3a, 3b, 3c, 3d) are alternately arranged and wound to form a capacitor element (5). The lead extraction terminals (6, 7) are connected to the anode foils (1a, 1b), respectively, and the lead extraction terminals (8, 9) are connected to the cathode foils (2a, 2b), respectively. The anode lead wires (11, 12) are connected to the lead wire extraction terminals (6, 7) respectively, and the cathode lead wire terminals (13, 14) are connected to the lead wire extraction terminals (8, 9) respectively.

Description

electrolytic capacitor

technical field

The present invention relates to an electrolytic capacitor capable of reducing equivalent series resistance. the

Background technique

In recent years, there has been a demand for circuit miniaturization and high frequency response, and accordingly, capacitors have also been required to have low impedance. Especially for computer CPU (Central Processing Unit) driving circuits and switching power supply circuits, etc., the circuit design requires absorption of high-frequency noise and pulsating current, and requires a low ESR (equivalent series resistance) capacitor. the

Fig. 27 is a perspective view showing the structure of a conventional aluminum wound solid electrolytic capacitor. Referring to FIG. 27, the conventional aluminum wound solid electrolytic capacitor 100 has an anodized foil 110, a cathode foil 120, a separator paper 130, a winding stop tape 140, lead wire (lead) extraction (tab) terminals 160, 170, an anode lead wire 180, and cathode lead 190. the

Anodized primary foil 110 , cathode foil 120 , and separator paper 130 are wound with separator 130 interposed between anodized primary foil 110 and cathode foil 120 . Afterwards, the winding stop tape 140 fixes the ends of the wound anodized foil 110 , cathode foil 120 , and release paper 130 . As a result, capacitive element 150 is formed. the

The lead-out terminal 160 protrudes from the end surface of the capacitive element 150 and is connected to the anodized foil 110 , and the lead-out terminal 170 protrudes from the end surface of the capacitive element 150 and is connected to the cathode foil 120 . The anode lead 180 is connected to the lead-out terminal 160 , and the cathode lead 190 is connected to the lead-out terminal 170 . the

Conventionally, as a method of reducing the equivalent series resistance, it is known to connect an anodized foil and a cathode foil to two lead wires, respectively (Patent Document 1). Fig. 28 is a diagram showing a method of connecting two anode leads and anodized foil. Referring to FIG. 28, two lead wire extraction terminals 160a, 160b are connected to the anodized foil 110 at predetermined intervals. In addition, two anode lead wires 180a, 180b are connected to lead wire extraction terminals 160a, 160b, respectively. the

The two cathode leads are connected to the cathode foil 120 in the same state as the state in which the two anode leads 180 a and 180 b are connected to the anodized foil 110 . the

Fig. 29 is another diagram showing a method of connecting two anode leads to an anodized foil. Referring to FIG. 29 , lead wire extraction terminal 160c is connected to anodized foil 110, and two anode lead wires 180a, 180b are connected to lead wire extraction terminal 160c at predetermined intervals. The two cathode leads are connected to the cathode foil 120 in the same state as the state in which the two anode leads 180a and 180b are connected to the anodized foil 110 . the

Conventional aluminum wound solid electrolytic capacitors can reduce the equivalent series resistance to about 2.0mΩ. the

A method of reducing the equivalent series resistance by connecting the anodized foil and the cathode foil to two lead wires is known. the

However, in the conventional method for reducing the equivalent series resistance, since a plurality of anode leads are connected to the anodized foil, and a plurality of cathode leads are connected to the cathode foil, it is difficult to make a connection between the plurality of anode leads and the anodized foil. The connection positions between the plurality of cathode leads and the cathode foil were fixed, and an aluminum electrolytic capacitor was fabricated. the

As a result, there is a problem that it is difficult to stably produce an aluminum electrolytic capacitor with low ESR. That is, because the equivalent series resistance changes due to the connection position between the anode lead and the anodized foil and the connection position between the cathode lead and the cathode foil (Patent Document 2), it is difficult to connect multiple anode leads and A plurality of cathode leads are respectively connected to the anodized foil and the cathode oxidized foil at the same position, and an aluminum electrolytic capacitor having almost the same equivalent series resistance is produced. the

Patent Document 1: JP-A-2004-179621 Gazette

Patent Document 2: JP-A-2005-203402 Gazette

Contents of the invention

Therefore, in order to solve the above-mentioned problems, an object of the present invention is to provide an electrolytic capacitor capable of stably reducing the equivalent series resistance. the

According to the present invention, the electrolytic capacitor is a winding type electrolytic capacitor containing a capacitive element and an electrolyte, characterized in that the above-mentioned capacitive element has: i (i is an integer greater than or equal to 2) anode parts and j (j is to satisfy 1≤j <i integer) sheets of cathode components, and k (k is an integer greater than 2) sheets of separator components. The i anode parts are electrically insulated from each other, and each has a dielectric (dielectric) coating on the surface. j sheets of cathode parts are wound together with i sheets of anode parts. k spacers are arranged at least between i anode parts and j cathode parts, and are wound together with i anode parts and j cathode parts, and the capacitive element uses the central part of the spacer in the longitudinal direction as a winding start part , formed by winding the anode member, the cathode member, and the separator member. the

In addition, according to the present invention, the electrolytic capacitor is a wound type electrolytic capacitor containing an electrolyte, characterized in that it has i (i is an integer of 2 or more) anode members and i cathode members, and k (k is 2 or more) Integer) sheets of isolated components. The i anode parts are electrically insulated from each other, and each has a dielectric coating on the surface. i sheets of cathode members are wound together with i sheets of anode members. The k separators are arranged between adjacent anode members and cathode members, and are wound together with i anode members and i cathode members. The diameter when i sheets of anode member, i sheet of cathode member, and k sheets of separator are wound is approximately equal to the diameter of a standard electrolytic capacitor in which one anode member and one cathode member are wound through one or two separator papers. the

Preferably, i sheets of anode members, i sheets of cathode members, and k sheets of separator members are composed of n (n is an integer greater than or equal to 2) sheets of anode members, n sheets of cathode members, and 2n or 2n-1 sheets of separators. In addition, the anode member, the cathode member, and the spacer each have a length approximately 1/n of the length of the anode member, the cathode member, and the spacer in the reference capacitor. the

As a preferred mode, the diameter of i anode parts, j cathode parts, and k spacer parts when they are wound up is the same as the reference electrolytic capacitor in which 1 anode part and 1 cathode part are wound up through 1 or 2 separator papers The diameters are approximately equal. the

As a preferred manner, the capacitive element formed by winding n anode parts, n cathode parts and 2n or 2n-1 spacer parts is composed of n capacitors arranged at different positions in the radial direction. the

As a preferred form, i pieces of anode components and j pieces of cathode components are respectively composed of n (n is an integer greater than 2) pieces of anode components and m (m is an integer satisfying 1≤m<n) pieces of cathode components; the anode components, having a length of approximately 1/n of the length of the anode part in the reference electrolytic capacitor; and a cathode part having a length of approximately 1/m of the length of the cathode part in the reference electrolytic capacitor. the

As a preferred manner, the capacitive element formed by winding n sheets of anode components, m sheets of cathode components and k sheets of spacer components is composed of n capacitors arranged at different positions in the radial direction. the

In a preferable embodiment, m sheets of cathode members are composed of one sheet of cathode members. the

Preferably, i sheets of anode members, j sheets of cathode members, and k sheets of spacer members constitute a plurality of capacitors having different capacities. the

As a preferable aspect, the electrolytic capacitor further includes a sealing member. The sealing part seals the capacitive element formed by winding i anode parts, i or j cathode parts and k spacers. In addition, the sealing member is made of resin. the

As a preferable aspect, the electrolytic capacitor further includes a sealing member. The sealing part seals the capacitive element formed by winding i anode parts, i or j cathode parts and k spacers. The sealing member is made of rubber. the

As a preferable embodiment, it further includes i anode leads, i cathode leads, anode electrodes, and cathode electrodes. The i anode lead wires are arranged corresponding to the i anode parts, and are respectively connected to approximately the center of the corresponding anode parts in the longitudinal direction of the corresponding anode parts. The i cathode lead wires are arranged corresponding to i or j cathode components, and are respectively connected to the approximate center of the corresponding cathode components in the length direction of the corresponding cathode components. The anode terminal is connected to i anode leads. The cathode terminal is connected to i cathode leads. In addition, i anode lead wires are connected to the anode terminal at the other end opposite to one end connected to i anode members; i cathode lead wires are connected to i or j cathode members. The other end on the opposite side to the one end is connected to the cathode terminal. the

As a preferred form, the electrolyte is made of polythiophene, polypyrrole, and polyaniline conductive polymers, or 7, 7, 8, 8-tetracyanoquinodimethane (Tetrasianoquinodimetan) complexes. composed of solid electrolytes. the

In the electrolytic capacitor of the present invention, a plurality of anode members and at least one cathode member are alternately arranged and wound through separator members. In addition, electrolytic capacitors have the effect of connecting a plurality of capacitive elements in parallel. That is, the electrolytic capacitor has the sum of the respective capacitor capacities of the plurality of capacitive elements, and the equivalent series resistance is reduced to one-fold the number of the plurality of capacitive elements. the

Therefore, according to the present invention, the equivalent series resistance of the electrolytic capacitor can be reduced. the

Description of drawings

FIG. 1 is a perspective view showing the configuration of an electrolytic capacitor according to Embodiment 1 of the present invention. the

2 is a cross-sectional view showing the configuration of the electrolytic capacitor according to Embodiment 1 of the present invention. the

Fig. 3 is a plan view of the electrolytic capacitor viewed from the direction A shown in Fig. 2 . the

Fig. 4 is a plan view for explaining details of anodized foil and lead-out terminals. the

5 is a perspective view showing how to arrange two anodized foils, two cathode foils, and four release papers. the

Fig. 6 is a diagram showing a method of winding an anodized foil, a cathode foil, and a separator paper. the

Fig. 7 is another diagram showing a method of winding an anodized foil, a cathode foil, and a separator paper. the

8 is another perspective view showing the configuration of the electrolytic capacitor according to Embodiment 1 of the present invention. the

FIG. 9 is a plan view of the release paper shown in FIG. 8 . the

FIG. 10 is a perspective view showing how to arrange the anodized foil, cathode foil, and separator paper when manufacturing the electrolytic capacitor shown in FIG. 8 . the

11 is another perspective view showing the configuration of the electrolytic capacitor according to Embodiment 1 of the present invention. the

Figure 12 is a plan view of anodized foil and cathode foil. the

FIG. 13 is a perspective view showing the structure of an electrolytic capacitor according to Embodiment 2. FIG. the

FIG. 14 is a plan view of the cathode foil shown in FIG. 13 . the

FIG. 15 is a perspective view showing how to arrange an anodized foil, cathode foil, and separator paper when manufacturing the electrolytic capacitor shown in FIG. 13 . the

16 is a perspective view showing another arrangement method of the anodized foil, the cathode foil, and the separator when the electrolytic capacitor shown in FIG. 13 is produced using two anodized foils and one cathode foil. the

17 is a perspective view showing another arrangement method of the anodized foil, the cathode foil, and the separator when the electrolytic capacitor shown in FIG. 13 is manufactured using two anodized foils and one cathode foil. the

18 is another perspective view showing the configuration of the electrolytic capacitor according to the second embodiment. the

Fig. 19 is a plan view of anodized foil, cathode foil and separator paper constituting the electrolytic capacitor shown in Fig. 18 . the

Fig. 20 is a perspective view showing how to arrange the anodized foil, cathode foil, and separator paper when manufacturing the electrolytic capacitor shown in Fig. 18 . the

21 is a perspective view showing another arrangement method of the anodized foil, the cathode foil, and the separator when the electrolytic capacitor shown in FIG. 18 is produced using three anodized foils and one cathode foil. the

22 is a perspective view showing another arrangement method of the anodized foil, the cathode foil, and the separator when the electrolytic capacitor shown in FIG. 18 is produced using three anodized foils and one cathode foil. the

FIG. 23 is another perspective view showing the structure of the electrolytic capacitor of Embodiment 2. FIG. the

FIG. 24 is a plan view of anodized foil, cathode foil, and separator paper constituting the electrolytic capacitor shown in FIG. 23 . the

Fig. 25 is a perspective view showing how to arrange the anodized foil, cathode foil, and separator paper when manufacturing the electrolytic capacitor shown in Fig. 23 . the

26 is a perspective view showing another arrangement method of the anodized foil, the cathode foil, and the separator when the electrolytic capacitor shown in FIG. 23 is produced using three anodized foils and two cathode foils. the

Fig. 27 is a perspective view showing the structure of a conventional aluminum wound solid electrolytic capacitor. the

Fig. 28 is a diagram showing a connection method between two anode leads and anodized foil. the

Fig. 29 is another diagram showing a connection method between two anode leads and anodized foil. the

In the figure: 1, 1a, 1b, 21a, 21b, 24a～24c, 110-anodized foil, 1A-winding start, 2, 2a, 2b, 22a, 22b, 23, 120-cathode foil, 3, 3a～3i , 130-isolating paper, 4, 140-stop winding tape, 5, 5a～5g, 150-capacitance element, 6～9, 15, 17, 160, 160a, 160b, 160c, 170-lead wire extraction terminal, 10, 10A , 10B, 20, 20A, 20B-electrolytic capacitor, 11, 12, 16, 180, 180a, 180b-anode lead, 13, 14, 18, 190-cathode lead, 15-shell, 16-rubber filler, 17-seat Plate, 17A to 17D-notch, 18-anode terminal, 19-cathode terminal, 100-aluminum wound solid electrolytic capacitor. the

Detailed ways

Embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same symbols are assigned to the same or corresponding parts in the drawings, and descriptions will not be repeated. the

[Implementation 1]

FIG. 1 is a perspective view showing the configuration of an electrolytic capacitor according to Embodiment 1 of the present invention. In addition, FIG. 2 is a cross-sectional view showing the configuration of the electrolytic capacitor according to Embodiment 1 of the present invention. 1 and 2, an electrolytic capacitor 10 according to Embodiment 1 of the present invention has anodized foil 1, cathode foil 2, separator paper 3, winding stop tape 4, lead wire extraction terminals 6-9, anode lead wires 11, 12, cathode Lead wires 13 , 14 , housing 15 , rubber packing 16 , and seat plate 17 . the

In addition, the electrolytic capacitor 10 is, for example, an electrolytic capacitor including a solid electrolyte. the

The anodized foil 1 consists of two anodized foils 1a and 1b. In addition, the two anode and cathode foils 1a and 1b are each composed of an aluminum foil whose surface has undergone a synthesis treatment. Therefore, the surface of each of the two anodized foils 1a and 1b is roughened, and an oxidation protective film is provided on the uneven surface. the

The cathode foil 2 is composed of two cathode foils 2a and 2b. In addition, the two cathode foils 2a and 2b are each made of aluminum foil. The release paper 3 is composed of four release papers 3a to 3d. the

The release paper 3a, the anodized foil 1a, the release paper 3b, the cathode foil 2a, the release paper 3c, the anodized foil 1b, the release paper 3d and the cathode foil 2b are set in sequence, and the set release paper 3a, the anodized foil 1a, The separator paper 3b, the cathode foil 2a, the separator paper 3c, the anodized foil 1b, the separator paper 3d, and the cathode foil 2b are wound. In addition, the ends of the wound release paper 3a, anodized foil 1a, release paper 3b, cathode foil 2a, release paper 3c, anodized foil 1b, release paper 3d and cathode foil 2b are fixed by the winding stop tape 4. In this way, the capacitive element 5 is formed. the

In the capacitor element 5, the anodized primary foil 1a, separator paper 3b, and cathode foil 2a constitute one capacitor element 5a, and the anodized primary foil 1b, separator paper 3d, and cathode foil 2b constitute one capacitor element 5b. the

The lead wire extraction terminal 6 is connected to the anodized foil 1a, and the lead wire extraction terminal 7 is connected to the anodized foil 1b. In addition, the lead wire extraction terminal 8 is connected to the cathode foil 2a, and the lead wire extraction terminal 9 is connected to the cathode foil 2b. the

Anode leads 11 , 12 are connected to lead lead terminals 6 , 7 , respectively, and cathode leads 13 , 14 are connected to lead lead terminals 8 , 9 , respectively. the

Case 15 is made of aluminum, and houses capacitive element 5 , lead-out terminals 6 to 9 , anode leads 11 and 12 , and cathode leads 13 and 14 . The rubber filler 16 seals the capacitive element 5 and the lead wire extraction terminals 6 to 9 in the housing 15 . The seat plate 17 fixes the anode leads 11 , 12 and the cathode leads 13 , 14 . In addition, if the capacitive element 5 is stored in the case 15, the anode leads 11, 12 and the cathode leads 13, 14 are bent along the seat plate 17. the

FIG. 3 is a plan view showing electrolytic capacitor 10 viewed from the direction A shown in FIG. 2 . Referring to FIG. 3 , seat plate 17 has a substantially rectangular planar shape and has notches 17A to 17D. In addition, the anode leads 11 , 12 and the cathode leads 13 , 14 are respectively bent toward the in-plane direction of the seat plate 17 to fit into the notches 17A to 17D of the seat plate 17 . the

Thus, the bent two anode leads 11 and 12 and the two cathode leads 13 and 14 are used as terminals of the electrolytic capacitor 10 . Therefore, the electrolytic capacitor 10 is an electrolytic capacitor having a four-terminal structure. the

FIG. 4 is a plan view for explaining the details of the anodized foil 1a and the lead-out terminal 6. As shown in FIG. Referring to FIG. 4 , the planar shape of the anodized foil 1 a is a rectangle having a length L that is half the length 2L of the previous anodized foil 110 , and the same width W as the previous anodized foil 110 . the

In addition, the lead wire drawing terminal 6 is connected to the anodized foil 1a at a position of L/2 from the winding start end 1A of the anodized foil 1a. In this way, the lead wire extraction terminal 6 is connected to the central portion of the anodized foil 1a in the longitudinal direction of the anodized foil 1a. the

The anodized foil 1b and the cathode foils 2a, 2b have the same length L and width W as the anodized foil 1a, respectively. In addition, the lead wire extraction terminals 7 to 9 are connected to the central portions of the anodized foil 1b and the cathode foils 2a and 2b, respectively. the

Separator paper 3 ( 3 a to 3 d ) has a length longer than anodized foil 1 and cathode foil 2 and a width wider than anodized foil 1 and cathode foil 2 . This is to prevent a short circuit between the anodized foil 1 and the cathode foil 2 . the

As described above, since the anodized foil 1 and the cathode foil 2 have a length L that is half the length 2L of the previous anodized foil 110, and the same width W as the previous anodized foil 110, the anodized foil 1 and the cathode foil The respective area S is half the area S0 of the previously anodized foil 110. As a result, the capacitance C of each of the capacitors 5 a and 5 b becomes half of the capacitance C0 of the capacitance element using the anodized foil 110 . the

However, as described later, the capacitive element 5 has the same effect as the parallel connection of two capacitive elements 5a, 5b having a capacity C, so its capacity becomes 2C (=C0), and one anodized foil 110 and 1 The capacity C0 of the conventional aluminum wound solid electrolytic capacitor 100 in which one cathode foil 120 is wound through one separator paper 130 is the same. the

Therefore, although the electrolytic capacitor 10 is fabricated using the anodized foil 1 and the cathode foil 2 having half the length of the conventional anodized foil 110 , its capacity will not be lower than that of the conventional aluminum wound solid electrolytic capacitor 100 . the

In addition, since the electrolytic capacitor 10 is produced by winding the anodized foil 1 and the cathode foil 2 having half the length of the conventional anodized foil 110, the diameter after winding is approximately equal to the diameter of the conventional aluminum wound solid electrolytic capacitor 100. That is, it is possible to fabricate an electrolytic capacitor that is not larger in size than the conventional aluminum wound solid electrolytic capacitor 100 and maintains capacity. the

A method of manufacturing electrolytic capacitor 10 will be described. Fig. 5 is a perspective view showing an arrangement method of two anodized foils 1a and 1b, two cathode foils 2a and 2b, and four separator papers 3a to 3d. Moreover, FIG. 6 is a figure which shows the winding method of anodized foil 1a, 1b, cathode foil 2a, 2b, and separator paper 3a-3d. First, etching treatment is performed on the surface of one sheet of aluminum foil having a large size, and then synthesis treatment is performed. Thereafter, the composite-processed aluminum foil was cut, and two aluminum foils having predetermined dimensions (length L and width W) were cut out to produce two anodized finished foils 1a and 1b. the

Thereafter, two cathode foils 2a, 2b having predetermined dimensions (length L and width W) are produced by the same method as that of the anodized foils 1a, 1b. In addition, four release papers having predetermined dimensions (length L+α and width W+α) were cut to produce release papers 3a to 3d. the

Thereafter, the anode leads 11 and 12 are connected to the lead lead terminals 6 and 7 respectively, and the cathode leads 13 and 14 are connected to the lead lead terminals 8 and 9 respectively. Thereafter, the lead wire extraction terminals 6, 7 are connected to the central portions of the anodized foils 1a, 1b, respectively, and the lead wire extraction terminals 8, 9 are respectively connected to the central portions of the cathode foils 2a, 2b. the

In this way, two sheets of anodized foils 1a and 1b, two sheets of cathode foils 2a and 2b, and four sheets of separator papers 3a to 3d are set in the state shown in FIG. 5 and wound up. That is, 2 sheets of anodized primary foil 1a, 1b, 2 sheets of cathode foil 2a, 2b, and 4 sheets of release paper 3a-3d are arranged such that 2 sheets of anodized primary foil 1a, 1b, 2 sheets of cathode foil 2a, 2b, and 4 sheets The winding start ends of the separator papers 3a to 3d are aligned, and the two anodized foils 1a and 1b, the two cathode foils 2a and 2b, and the four separator papers 3a to 3d are wound. More specifically, two anodized foils 1a, 1b, two cathode foils 2a, 2b, and four release papers 3a-3d are set in the state shown in FIG. 6, and the two anodized foils 1a, 1b, 2 pieces of cathode foils 2a, 2b and 4 pieces of separator paper 3a～3d rotate clockwise (or counterclockwise) around the fulcrum FLC, anodize 2 pieces of foil 1a, 1b, 2 pieces of cathode foil 2a, 2b and 4 pieces of separator Papers 3a to 3d are intertwined. In this way, capacitive element 5 is fabricated. In addition, the winding starting ends of the two anodized foils 1a, 1b, the two cathode foils 2a, 2b, and the four release papers 3a to 3d may not coincide, but the two anodized foils 1a, 1b, and the two cathode foils may be Foils 2a, 2b and four release papers 3a to 3d are wound together. the

Afterwards, the capacitive element 5 to which the lead wire extraction terminals 6-9, the anode leads 11, 12, and the cathode leads 13, 14 are connected is subjected to notch oxidation and heat treatment at 150° C. to 300° C., and the mixed solution is immersed in the capacitive element 5 middle. This mixed solution is a mixed solution of a monomer that becomes a conductive polymer by polymerization, and a p-diferric alcohol solution of toluenesulfonate as an oxidizing agent solution. the

Thereafter, a conductive polymer layer is formed between the two electrodes of the capacitive element 5 by thermochemical polymerization. In this way, the electrolyte is contained in the capacitive element 5 . The electrolyte is, for example, polythiophene, polypyrrole, and polyaniline conductive polymers, or a solid electrolyte composed of 7, 7, 8, 8-tetracyanoquinodimethane (TCNQ) complexes. After the electrolyte is soaked in the capacitive element 5 , the rubber packing 16 is inserted into the capacitive element 5 , and the capacitive element 5 inserted with the rubber packing 16 is stored and fixed in the casing 15 . the

Next, lateral pressing and crimping are performed on the opening of the case 15 to seal the rubber packing 16 and the capacitance element 5, and etching is performed. After that, the seat plate 17 is inserted into the curled surface of the capacitive element 5, and the anode leads 11, 12 and the cathode leads 13, 14 are punched and bent as electrode terminals. In this way, electrolytic capacitor 10 is completed. the

Fig. 7 is another diagram showing a method of winding anodized foils 1a, 1b, cathode foils 2a, 2b, and separator papers 3a to 3d. Electrolytic capacitor 10 can also be produced by the following method. Two sheets of anodized foils 1a and 1b and two sheets of cathode foils 2a and 2b were produced by the same method as the method described above. the

Thereafter, two release papers 3a and 3c having length L+α and width W+α, and one release paper 3e having length L+α and width W+α are produced. Thereafter, the anode leads 11 and 12 are connected to the lead lead terminals 6 and 7 respectively, and the cathode leads 13 and 14 are connected to the lead lead terminals 8 and 9 respectively. Next, the lead wire extraction terminals 6, 7 are connected to the central portions of the anodized foils 1a, 1b, respectively, and the lead wire extraction terminals 8, 9 are respectively connected to the central portions of the cathode foils 2a, 2b. the

In this way, two anodized foils 1a, 1b, two cathode foils 2a, 2b, and three release papers 3a, 3c, 3e are set in the state shown in FIG. 6, and the two anodized foils 1a, 1b are placed. , 2 pieces of cathode foils 2a, 2b and 3 pieces of release paper 3a, 3c, 3e rotate clockwise (or counterclockwise) around the fulcrum FLC, and anodize 2 pieces of foil 1a, 1b, 2 pieces of cathode foil 2a, 2b and Three sheets of release paper 3a, 3c, 3e are wound up. In this way, capacitive element 5 is fabricated. the

Thereafter, the electrolytic capacitor 10 was produced by the same method as the above-mentioned method. When the electrolytic capacitor 10 is manufactured by the method shown in FIG. 7, the separator paper 3e wound constitutes the separator paper 3b, 3d. the

Furthermore, the electrolytic capacitor 10 in the present invention can also be produced by the following method. The manufacturing method described below is a method of manufacturing the electrolytic capacitor 10 using a reel of aluminum foil having a predetermined width (500 nm). First, etching treatment is performed on the surface of an aluminum foil having a predetermined width (500 nm), and then synthesis treatment is performed. In this way, two anodized foils 1a, 1b and two cathode foils 2a, 2b are produced. the

Thereafter, the anode leads 11 and 12 are connected to the lead lead terminals 6 and 7 respectively, and the cathode leads 13 and 14 are connected to the lead lead terminals 8 and 9 respectively. Thereafter, the lead wire extraction terminals 6, 7 are connected to the central portions of the anodized foils 1a, 1b, respectively, and the lead wire extraction terminals 8, 9 are respectively connected to the central portions of the cathode foils 2a, 2b. the

After that, 2 sheets of anodized foil 1a, 1b (reel-shaped), 2 sheets of cathode foil 2a, 2b (reel-shaped), and 4 sheets of release paper (reel-shaped) with a specified width W+α pass through the diagram. 6 or the method shown in Figure 7, and cut off at a given length L. In this way, the capacitive element 5 is produced. the

The electrolytic capacitor 10 is then completed by the method described above. the

As described above, when producing the electrolytic capacitor 10 using two sheets of anodized foils 1a and 1b and two sheets of cathode foils 2a and 2b, four or three sheets of separator paper are used. the

Next, electrical characteristics of electrolytic capacitor 10 will be described. Table 1 shows a comparison of the electrical characteristics of electrolytic capacitor 10 according to Embodiment 1 and conventional electrolytic capacitors. the

【Table 1】

the Cathode foil The number of structures of each electrode foil Capacitance (μ F) tan δ(%) Equivalent series resistance (mΩ) Conventional Example 1 aluminum foil 1 565 2.5 5.5 Example 1 aluminum foil 2 562 2.4 2.8 Example 2 aluminum foil 3 563 2.5 1.9 Conventional example 2 Aluminum nitride foil 1 1520 1.8 7.0 Example 3 Aluminum nitride foil 2 1560 1.8 3.6 Example 4 Aluminum nitride foil 3 1530 1.9 2.4

In Table 1, Conventional Examples 1 and 2 are electrolytic capacitors composed of only one capacitive element 150 made of anodized foil 110 and cathode foil 120 having a length of 2L, while Examples 1 and 2 use two anodized foils. An electrolytic capacitor 10 made of 1 and 2 cathode foils 2 . the

In addition, Example 2 is an electrolytic capacitor 10 produced by using three anodized foils 1 and three cathode foils 2. An electrolytic capacitor 10 made of one anodized foil 1 and two cathode foils 2 . the

Furthermore, in Example 4, the cathode foil 2 was replaced with an aluminum foil with an aluminum titanium nitride film formed on the surface, and an electrolytic capacitor 10 was produced using three anodized foils 1 and three cathode foils 2 . the

Furthermore, capacitance and dielectric tangent (tan δ) were measured at 120 Hz, and equivalent series resistance ESR was measured at 100 kHz. the

In addition, the aluminum titanium nitride film was formed on the surface of the aluminum foil by vapor deposition. In addition, in the case where the anodized foil 1 and the cathode foil 2 are three, the length of the anodized foil 1 and the cathode foil 2 is set to one third of the length 2L of the anodized foil 110 and the cathode foil 120 previously. one. Furthermore, the respective values of capacitance, dielectric tangent (tan δ) and equivalent series resistance ESR shown in Table 1 are average values of 30 samples. the

From the results in Table 1, the capacitance and dielectric tangent (tan δ) of the electrolytic capacitor 10 of the present invention are almost the same as those of Conventional Examples 1 and 2. In addition, when the number of the anodized foil 1 and the cathode foil 2 is two, the equivalent series resistance ESR of the electrolytic capacitor 10 of the present invention is reduced to about one-half of that of the conventional examples 1 and 2 (see Example 1). 1, 3). the

In addition, when the number of the anodized foil 1 and the cathode foil 2 is three, the equivalent series resistance ESR of the electrolytic capacitor 10 of the present invention is reduced to about one-third of that of the conventional examples 1 and 2 (refer to Example 1). 2, 4). the

Therefore, by setting the number of anodized foil 1 and cathode foil 2 to 2 or 3, and setting the length of anodized foil 1 and cathode foil 2 to the length L of the previous anodized foil 110 and cathode foil 120 1/2 or 1/3 of that, it is possible to reduce the equivalent series resistance ESR to approximately 1/2 or 1/3 while maintaining the capacitance and dielectric tangent of the electrolytic capacitor 10 . the

That is, by winding two or three anodized foils 1 and cathode foil 2 through separator paper 3 , an electrolytic capacitor 10 having the same effect as that obtained by connecting two or three capacitive elements in parallel can be produced. the

In addition, in Table 1, the reason why the capacitance of Conventional Example 2 and Examples 3 and 4 is greater than that of Conventional Example 1 and Examples 1 and 2 is that by forming an aluminum titanium nitride film on the surface of the cathode foil 2, the cathode The connection between the foil 2 and the conductive polymer is better, and the overall capacity increases. That is, if the capacitor capacity (static capacity) is C, the anode foil capacity is Ca, and the cathode foil capacity is Cc, the capacitor capacity (static capacity) C is 1/C=1/Ca+1/Cc It is calculated that when an aluminum nitride film is formed on the surface of the cathode foil, since the cathode foil capacity Cc is maximized (or infinite), 1/Cc is infinitely close to 0 (zero), so the capacitor capacity (static capacity) C becomes is C=Ca. As a result, the capacitance increases even with the same anode foil. the

8 is another perspective view showing the configuration of the electrolytic capacitor according to Embodiment 1 of the present invention. The electrolytic capacitor according to Embodiment 1 of the present invention may be an electrolytic capacitor 10A shown in FIG. 8 . Referring to FIG. 8 , electrolytic capacitor 10A replaces separator papers 3 a to 3 d of electrolytic capacitor 10 with separator papers 3 f and 3 g , and is the same as electrolytic capacitor 10 in other respects. the

The electrolytic capacitor 10A is composed of two capacitive elements 5c and 5d in which two anodized foils 1a and 1b, two cathode foils 2a and 2b, and two separator papers 3f and 3g are wound. the

Capacitive element 5c is composed of anodized foil 1a, cathode foil 2a, and release paper 3f, 3g, and capacitive element 5d is composed of anodized foil 1b, cathode foil 2b, and release paper 3f, 3g. In addition, the capacitive element 5c is provided on the inner peripheral side, and the capacitive element 5d is provided on the outer peripheral side. Therefore, the electrolytic capacitor 10A is constituted by two capacitive elements 5c and 5d provided at different positions in the radial direction. the

FIG. 9 is a plan view of release paper 3f, 3g shown in FIG. 8 . Referring to FIG. 9 , release papers 3f and 3g have a length of 2L+α and a width of W+α, respectively. the

Fig. 10 is a perspective view showing how to arrange anodized foils 1a, 1b, cathode foils 2a, 2b, and separator papers 3f, 3g when manufacturing the electrolytic capacitor 10A shown in Fig. 8 . Referring to Fig. 9, two sheets of anodized foils 1a and 1b are continuously installed between release paper 3f and release paper 3g. In this case, two anodized foils 1a and 1b are provided at a predetermined distance so as to be electrically insulated from each other. In addition, the cathode foil 2a is provided facing the anodized foil 1a through a separator 3g. The cathode foil 2b is arranged to face the anodized foil 1b through a release paper 3g. As a result, the two cathode foils 2a and 2b are continuously installed with respect to the winding direction DR1. In this case, the two cathode foils 2a and 2b are provided at a predetermined distance and electrically insulated from each other. In this way, in the electrolytic capacitor 10A, the two anodized foils 1a, 1b and the two cathode foils 2a, 2b are continuously arranged with respect to the winding direction DR1. the

2 sheets of anodized foil 1a, 1b, 2 sheets of cathode foil 2a, 2b, and 2 sheets of release paper 3f, 3g are set according to the state shown in Figure 10, 2 sheets of anodized foil 1a, 1b, and 2 sheets of cathode foil 2a, 2b , and two sheets of release paper 3f, 3g are wound in the winding direction DR1 from the winding start ends 1A, 2A, 3A, and the capacitive element 5 composed of two capacitive elements 5c, 5d is manufactured. At the stage of winding the anodized foil 1a, the cathode foil 2a, and the release paper 3f and 3g of the long L part, the capacitive element 5c is produced, and after winding the anodized foil 1b, the cathode foil 2b, and the release paper of the remaining long L part In stages 3f and 3g, the capacitive element 5d is fabricated. the

Therefore, the capacitive element 5c is provided on the inner peripheral side, and the capacitive element 5d is provided on the outer peripheral side. the

After winding two anodized foils 1a, 1b, two cathode foils 2a, 2b, and two separator papers 3f, 3g to fabricate capacitive element 5, electrolytic capacitor 10A is fabricated by the same method as electrolytic capacitor 10. the

In addition, in the manufacture of the electrolytic capacitor 10A, the two anodized foils 1a, 1b, the two cathode foils 2a, 2b, and the two separator papers 3f, 3g may not be wound from the winding starting ends 1A, 2A, 3A, but from the Two sheets of anodized foils 1a, 1b, two sheets of cathode foils 2a, 2b, and two sheets of separator papers 3f, 3g are wound around the center of the two sheets of separator paper 3f, 3g. In this way, through the winding method of two anodized foils 1a, 1b, two cathode foils 2a, 2b, and two release papers 3f, 3g, the lead wire extraction terminals 6-9 are set as quadrilaterals as shown in FIG. 1 or in FIG. 8 The straight line shown. the

In addition, in the production of the electrolytic capacitor 10A, the cathode foil 2b can be provided at the position of the cathode foil 2a, the cathode foil 2a can be provided at the position of the anodized foil 1b, and the anodized foil 1b can be provided at the position of the cathode foil 2b, and the winding 2 One sheet of anodized forming foil 1a, 1b, two sheets of cathode foil 2a, 2b, and two sheets of separator paper 3f, 3g. That is, foils of different polarities may be arranged in the winding direction DR1, and two anodized foils 1a, 1b, two cathode foils 2a, 2b, and two separator papers 3f, 3g may be wound. the

In the electrolytic capacitor 10A, since the capacitive elements 5c and 5d are composed of an anodized foil and a cathode foil having a length L and a width W, respectively, they have a capacitance C. In addition, the capacitive element 5 has the same effect as when the two capacitive elements 5c and 5d are connected in parallel, so its capacity becomes 2C (=C0), which is the same as the capacity C0 of the conventional aluminum wound solid electrolytic capacitor 100. the

Therefore, although the electrolytic capacitor 10A is manufactured using the anodized foil 1 and the cathode foil 2 having half the length of the previous anodized foil 110, its capacity will not be lower than that of the previous aluminum wound solid electrolytic capacitor 100, which is equivalent The series resistance is one-half that of the conventional aluminum wound solid electrolytic capacitor 100 . the

In addition, since the electrolytic capacitor 10A is produced by setting the conventional anodized foil 110 and the cathode foil 120 as two anodized foils and two cathode foils respectively, the diameter after winding is the same as that of the conventional aluminum wound solid electrolytic capacitor 100. Roughly equal. That is, the electrolytic capacitor 10A with reduced equivalent series resistance can be produced without being larger in size than the conventional aluminum wound solid electrolytic capacitor 100 while maintaining capacity. the

11 is another perspective view showing the configuration of the electrolytic capacitor according to Embodiment 1 of the present invention. The electrolytic capacitor according to Embodiment 1 of the present invention may be an electrolytic capacitor 10B shown in FIG. 11 . Referring to FIG. 11 , an electrolytic capacitor 10B has an anode terminal 18 and a cathode terminal 19 added to the electrolytic capacitor 10 shown in FIG. 1 , and is otherwise the same as the electrolytic capacitor 10 . the

The anode terminal 18 is connected to the two anode leads 11 and 12 , and the cathode terminal 19 is connected to the two cathode leads 13 and 14 . Thus, in the electrolytic capacitor 10B, the two anode leads 11, 12 and the two cathode leads 13, 14 are connected to one anode terminal 18 and one cathode terminal 19, respectively. Therefore, the electrolytic capacitor 10B is an electrolytic capacitor having a two-terminal structure. the

In addition, in the electrolytic capacitor 10B, the two anode leads 11, 12 and the two cathode leads 13, 14 may not be connected to one anode terminal 18 and one cathode terminal 19, respectively, but may be used bundled into one. the

In addition, in Embodiment 1, the anode terminal 18 and the cathode terminal 19 may be added to the electrolytic capacitor 10A. the

Figure 12 is a plan view of anodized foil and cathode foil. 12, the anodized foil 21a and the cathode foil 22a have a length L1 and a width W, and the anodized foil 21b and the cathode foil 22b have a length L2 and a width W. Here, L1+L2=2L. the

In the present invention, the anodized foils 1a, 1b and cathode foils 2a, 2b of the electrolytic capacitors 10, 10A can be replaced by anodized foils 21a, 21b and cathode foils 22a, 22b, respectively. the

In this case, the capacitive element composed of the anodized primary foil 21a, the separator paper 3b, and the cathode foil 22a has a different capacitance from the capacitive element composed of the anodized primary foil 21b, the separator paper 3d, and the cathode foil 22b. the

Therefore, in the present invention, the two capacitive elements included in the electrolytic capacitors 10 and 10A may have different capacities from each other. the

The method of setting the capacities of the two capacitive elements included in the electrolytic capacitors 10 and 10A to be different from each other is not limited to making the length of the anodized foil and cathode foil of one capacitive element the same as that of the other capacitive element. The lengths of the anodized foil and the cathode foil are different, and the width of the anodized foil and the cathode foil of one capacitive element is different from the width of the anodized foil and the cathode foil of the other capacitive element. . the

That is, the method of setting the capacities of the two capacitive elements contained in the electrolytic capacitors 10 and 10A to be different from each other may be to set the area of anodized foil and cathode foil of one capacitive element to be equal to that of the other. Anodization of capacitive elements into different methods of foil and cathode foil area. In addition, there is a method of changing the type of foil and the combined voltage of the foil. the

Above, the case where the number of anodized foils and cathode foils is 2 or 3 has been described, but the present invention is not limited thereto. Generally, the number of anodized foils and cathode foils is n (n is 2 or more integers) are fine. the

In this case, 2n or 2n-1 sheets of separator paper are used, and n pieces of anode lead wires and cathode lead wires are used respectively. Also, n anode leads may be connected to one anode terminal, and n cathode leads may be connected to one cathode terminal. In addition, when n sheets of anodized foil 1, n sheets of cathode foil 2, and 2n or 2n-1 sheets of release paper 3 are wound up, the diameter is set to be the same as one sheet of anodized foil 110, one sheet of cathode foil 120, and In the case where the diameters of the two release papers 130 are substantially the same when they are wound, the respective lengths of n sheets of anodized foil 1 and n sheets of cathode foil 2 are assumed to be one anodized foil 110, one cathode foil 120, and When one or two sheets of release paper 130 are wound, the anodized length is one-nth of the length of the foil 110 and the cathode foil 120 . the

When n sheets of anodized foil 1, n sheets of cathode foil 2, and 2n or 2n-1 sheets of separator paper 3 are wound to make electrolytic capacitors 10, 10A, the electrolytic capacitors 10, 10A contain n capacitive elements, but In the present invention, the capacities of the n capacitive elements can be set to be different from each other through the above method. the

In addition, above, the case where the lead wire extraction terminals 6 to 9 are respectively connected to the positions L/2 from the winding start ends 1A of the anodized foils 1a, 1b and the cathode foils 2a, 2b has been described, but the present invention is not limited to Here, lead wire extraction terminals 6 to 9 may be connected to positions within a range of 7L/20 to 13L/20 from winding start ends 1A of anodized foils 1a, 1b and cathode foils 2a, 2b, respectively. the

This is because the electrolytic capacitors 10, 10, The equivalent series resistance of 10A is almost constant. the

Further, above, the case where the electrolytic capacitors 10 and 10A contain a solid electrolyte has been described, but the present invention is not limited thereto, and the electrolytic capacitors 10 and 10A may contain a liquid electrolyte. That is, electrolytic capacitors 10 and 10A may contain an electrolyte composed of either a solid electrolyte or a liquid electrolyte. the

Furthermore, above, the case where the anodized foil 1 and the cathode foil 2 are made of aluminum foil has been described, but the present invention is not limited to this, and the anodized foil 1 and the cathode foil 2 may also be made of valve metals such as tantalum and niobium. Valve metal oxide vapor deposition foil, single metal nitride vapor deposition foil, composite metal nitride vapor deposition foil and carbon foil. the

Furthermore, the electrolytic capacitors 10 and 10A according to Embodiment 1 of the present invention can be produced using the anodized foil 1 and the cathode foil 2 having the same lengths as the anodized foil 110 and the cathode foil 120 of the aluminum wound solid electrolytic capacitor 100 . . In this case, the electrolytic capacitor 10 has a capacity larger than that of the aluminum wound solid electrolytic capacitor 100 and a diameter larger than that of the aluminum wound solid electrolytic capacitor 100 . the

In addition, in the present invention, an aluminum wound solid electrolytic capacitor 100 produced by winding one anodized foil 110, one cathode foil 120, and one or two separator papers 130 constitutes a "reference electrolytic capacitor". the

[Implementation 2]

FIG. 13 is a perspective view showing the configuration of an electrolytic capacitor according to Embodiment 2. FIG. Referring to FIG. 13 , electrolytic capacitor 20 of Embodiment 2 replaces two cathode foils 2 a , 2 b of electrolytic capacitor 10A shown in FIG. 8 and FIG. 10 with one cathode foil 23 , and is otherwise the same as electrolytic capacitor 10A. Therefore, electrolytic capacitor 20 also has capacitive element 5 constituted by two capacitive elements 5c and 5d provided at different positions in the radial direction. In addition, in the electrolytic capacitor 20 , a resin seal may be used instead of the rubber packing 16 . In addition, resin sealing can be used not only for the electrolytic capacitor 20 but also for the electrolytic capacitors 10 , 10A, and 10B. the

FIG. 14 is a plan view of cathode foil 23 shown in FIG. 13 . Referring to FIG. 14 , cathode foil 23 has a length of 2L and a width of W. In addition, the lead wire extraction terminal 8 is connected to the cathode foil 23 at a position of L/2 from one end portion 23A of the cathode foil 23, and the lead wire extraction terminal 9 is connected to the cathode foil 23 at a distance of L/2 from the other end portion 23B of the cathode foil 23. It is connected to the cathode foil 23 in position. As a result, the distance between the lead wire extraction terminals 8 and 9 becomes L. the

FIG. 15 is a perspective view showing how to arrange anodized foils 1a, 1b, cathode foil 23, and separator papers 3f, 3g when manufacturing electrolytic capacitor 20 shown in FIG. 13 . Referring to Fig. 15, two sheets of anodized foils 1a and 1b are continuously installed between release paper 3f and release paper 3g. In this case, two anodized foils 1a and 1b are provided at a predetermined distance and electrically insulated from each other. In addition, the cathode foil 23 is provided to face the anodized foils 1a and 1b via the separator paper 3g. the

2 sheets of anodized foil 1a, 1b, 1 sheet of cathode foil 23, and 2 sheets of release paper 3f, 3g are set according to the state shown in Figure 15, 2 sheets of anodized foil 1a, 1b, 1 sheet of cathode foil 23, and 2 sheets Separator paper 3f, 3g is wound in winding direction DR1 from winding start end 1A, 23A, 3A, and the capacitive element 5 which consists of two capacitive elements 5c, 5d is produced. At the stage of winding the anodized foil 1a, the cathode foil 23 of the long L portion, and the separator papers 3f and 3g of the long L portion, the capacitive element 5c is produced, and after winding the anodized foil 1b, the cathode foil 23 of the remaining long L portion , and the stage of the release paper 3f and 3g of the remaining long L part, the capacitive element 5d is produced. the

Therefore, the capacitive element 5c is provided on the inner peripheral side, and the capacitive element 5d is provided on the outer peripheral side. the

In addition, in the production of the electrolytic capacitor 20, two sheets of anodized foil 1a, 1b, one sheet of cathode foil 23, and two sheets of separator paper 3f, 3g may not be wound from the winding starting ends 1A, 23A, and 3A, but from two sheets. Two sheets of anodized finished foil 1a, 1b, one sheet of cathode foil 23, and two sheets of separator paper 3f, 3g start to be wound around the central part of the separator paper 3f, 3g. In this way, by winding two sheets of anodized foil 1a, 1b, one sheet of cathode foil 23, and two sheets of release paper 3f, 3g, the lead wire extraction terminals 6-9 are arranged in a quadrangular shape as shown in FIG. 1 or as shown in FIG. 13. of straight line. the

After winding two anodized foils 1a, 1b, one cathode foil 23, and two separator papers 3f, 3g to produce capacitive element 5, electrolytic capacitor 20 is produced by the same method as electrolytic capacitor 10. In the production of this electrolytic capacitor 20, when a resin seal is used instead of the rubber packing 16, since the resin seal is easier to manufacture than the rubber packing, the process yield (productivity) can be improved. the

In the electrolytic capacitor 20, since the capacitive elements 5c and 5d are composed of an anodized foil and a cathode foil having a length L and a width W, respectively, they have a capacity C. In addition, as described later, the capacitive element 5 has the same effect as when the two capacitive elements 5c and 5d are connected in parallel, so its capacity becomes 2C (=C0), which is different from the capacity of the conventional aluminum wound solid electrolytic capacitor 100. C0 is the same. the

Therefore, although the electrolytic capacitor 20 is manufactured using the anodized foil 1 having half the length of the previous anodized foil 110 and the cathode foil 23 having the same length as the previous cathode foil 120, its capacity will not be higher than that of the previous aluminum winding. The capacitance of the solid electrolytic capacitor 100 is small, and the equivalent series resistance is one-half of that of the conventional aluminum wound solid electrolytic capacitor 100. the

In addition, since the electrolytic capacitor 20 is produced by dividing the conventional anodized foil 110 into two anodized foils 1a and 1b arranged continuously in the winding direction DR1, the diameter after winding is the same as that of the conventional aluminum wound solid electrolytic capacitor 100. The diameters are approximately equal. That is, it is possible to manufacture the electrolytic capacitor 20 with reduced equivalent series resistance, which is not larger in size than the conventional aluminum wound solid electrolytic capacitor 100, and maintains the capacity. the

Thus, by using one cathode foil 23 and two anodized foils 1a and 1b, it is possible to manufacture the electrolytic capacitor 20 having the same effect as when two capacitive elements 5c and 5d are connected in parallel. the

Table 2 shows a comparison of the electrical characteristics of the electrolytic capacitor 20 according to Embodiment 2 and a conventional electrolytic capacitor. the

【Table 2】

the Cathode foil Sealing material Capacitance (μF) tanδ(%) Equivalent series resistance (mΩ) Leakage current (μA) Conventional Example 1 aluminum foil rubber 565 2.5 5.5 11 Example 1 aluminum foil rubber 567 2.3 2.7 12 Example 2 aluminum foil resin 562 2.5 2.7 18 Conventional example 2 Aluminum nitride foil rubber 1520 1.8 7.0 13 Example 3 Aluminum nitride foil rubber 1532 1.7 3.4 11 Example 4 Aluminum nitride foil resin 1539 1.7 3.4 19

In Table 2, Conventional Examples 1 and 2 are electrolytic capacitors composed of only one capacitive element 150 made of anodized foil 110 and cathode foil 120 having a length of 2L, and Example 1 uses two anodized foils 1a, 1b, an electrolytic capacitor 10 made of a cathode foil 23 and a rubber filler 16 . the

In addition, Example 2 is the electrolytic capacitor 20 manufactured by using resin sealing instead of the rubber filler 16 in Example 1, and Example 3 is that the cathode foil 23 in Example 1 is replaced with an aluminum foil surface formed with aluminum titanium nitride. As for the film, an electrolytic capacitor 20 produced by using two anodized foils 1a, 1b and one cathode foil 22 is used. Example 4 is an electrolytic capacitor 20 produced by using resin sealing instead of rubber filler 16 in Example 3. the

Furthermore, the capacitance and dielectric tangent (tan δ) were measured at 120 Hz, the equivalent series resistance ESR was measured at 100 kHz, and the exposure current LC was a value when a rated voltage was applied for 2 minutes. the

In addition, the aluminum titanium nitride film was formed on the surface of the aluminum foil by vapor deposition. Furthermore, the respective values of capacitance, dielectric tangent (tan δ), equivalent series resistance ESR, and leakage current LC shown in Table 2 are average values of 30 samples. the

From the results in Table 2, the capacitance and dielectric tangent (tan δ) of the electrolytic capacitor 20 according to Embodiment 2 are almost the same as those of Conventional Examples 1 and 2. In addition, the equivalent series resistance ESR of the electrolytic capacitor 20 according to Embodiment 2 is reduced to about half of that of Conventional Examples 1 and 2 (see Examples 1 to 4). In addition, even if the rubber packing 16 is changed to a resin seal, the equivalent series resistance does not change. the

In this way, it has been confirmed by experiments that even if there is only one cathode foil, by setting the number of anodized foils to two, the equivalent series resistance can be reduced to approximately one-half while maintaining the capacity of the capacitor. In addition, it can also be confirmed through experiments that the equivalent series resistance does not change even if resin sealing is used. the

FIG. 16 is a perspective view showing another arrangement method of the anodized foil, the cathode foil, and the separator when the electrolytic capacitor 20 shown in FIG. 13 is produced using two anodized foils and one cathode foil. Referring to FIG. 16 , when the electrolytic capacitor 20 shown in FIG. 13 is manufactured using two anodized foils and one cathode foil, the electrolytic capacitor 20 has a separator 3h in addition to the two separator papers 3f and 3g. the

If the release paper 3f, 3g is longer than the anodized foils 1a, 1b, it may be shorter than the release paper 3h. The anodized foil 1a is provided between the release paper 3g and the release paper 3h. The anodized foil 1b is provided between the release paper 3f and the release paper 3g. In this case, the anodized foil 1 b is arranged continuously to the anodized foil 1 a in the winding direction DR1 . The cathode foil 23 is provided to face the anodized foil 1a through the separator paper 3h, and to face the anodized foil 1b through the separator papers 3g and 3h. the

2 sheets of anodized foil 1a, 1b, 1 sheet of cathode foil 23, and 3 sheets of release paper 3f, 3g, 3h are set according to the state shown in Figure 16, 2 sheets of anodized foil 1a, 1b, 1 sheet of cathode foil 23, and Three separator papers 3f, 3g, and 3h are wound in the winding direction DR1 from the winding start ends 1A, 23A, and 3A, and the capacitive element 5 composed of two capacitive elements 5c, 5d is produced. At the stage of winding the anodized foil 1a, the cathode foil 23 of the long L part, and the release papers 3f, 3g, and 3h of the long L part, the capacitive element 5c is produced, and after winding the anodized foil 1b, the cathode of the remaining long L part At the stages of foil 23 and the remaining separator papers 3f, 3g, and 3h of the long L portion, the capacitive element 5d is produced. the

Therefore, the capacitive element 5c is provided on the inner peripheral side, and the capacitive element 5d is provided on the outer peripheral side. the

Two sheets of anodized foil 1a, 1b, one sheet of cathode foil 23, and three sheets of separator paper 3f, 3g, and 3h are wound together to produce a capacitive element 5, and then an electrolytic capacitor is produced by the same method as that of the electrolytic capacitor 10. 20. the

The electrolytic capacitor 20 produced by using two anodized foils 1a, 1b, one cathode foil 23, and three separator papers 3f, 3g, and 3h is the same as using two anodized foils 1a, 1b, and one cathode foil 23 , and two sheets of separator paper 3f, 3g compared to the situation, because only one more sheet of separator paper 3h is included, so the diameter after winding is approximately equal to the diameter of the conventional aluminum wound solid electrolytic capacitor 100. the

In addition, in the case of using two anodized foils 1a, 1b, one cathode foil 23, and three separator papers 3f, 3g, and 3h to make the electrolytic capacitor 20, the anodized foil 1a can be placed on the separator in FIG. Between the paper 3f and the release paper 3g, the anodized foil 1b is placed between the release paper 3g and the release paper 3h. the

FIG. 17 is a perspective view showing another arrangement method of the anodized foil, the cathode foil, and the separator when the electrolytic capacitor 20 shown in FIG. 13 is produced using two anodized foils and one cathode foil. the

Referring to FIG. 17 , cathode foil 23 is disposed between release paper 3f and release paper 3g. The anodized finished foil 1a is arranged opposite to the cathode foil 23 through the separator paper 3g, and the anodized finished foil 1b is arranged opposite to the cathode foil 23 through the separator paper 3f. In this case, the anodized foil 1 b is arranged continuously to the anodized foil 1 a in the winding direction DR1 . the

2 sheets of anodized foil 1a, 1b, 1 sheet of cathode foil 23, and 2 sheets of release paper 3f, 3g are set according to the state shown in Figure 17, 2 sheets of anodized foil 1a, 1b, 1 sheet of cathode foil 23, and 2 sheets Separator paper 3f, 3g is wound in winding direction DR1 from winding start end 1A, 23A, 3A, and the capacitive element 5 which consists of two capacitive elements 5c, 5d is produced. At the stage of winding the anodized foil 1a, the cathode foil 23 of the long L portion, and the separator papers 3f and 3g of the long L portion, the capacitive element 5c is produced, and after winding the anodized foil 1b, the cathode foil 23 of the remaining long L portion , and the stage of the release paper 3f and 3g of the remaining long L part, the capacitive element 5d is produced. the

Therefore, the capacitive element 5c is provided on the inner peripheral side, and the capacitive element 5d is provided on the outer peripheral side. the

After winding two anodized foils 1a, 1b, one cathode foil 23, and two separator papers 3f, 3g to produce capacitive element 5, electrolytic capacitor 20 is produced by the same method as electrolytic capacitor 10. the

In addition, in the production of the electrolytic capacitor 20, two sheets of anodized foil 1a, 1b, one sheet of cathode foil 23, and two sheets of separator paper 3f, 3g may not be wound from the winding starting ends 1A, 23A, and 3A, but from two sheets. Two sheets of anodized finished foils 1a, 1b, one sheet of cathode foil 23, and two sheets of separator papers 3f, 3g are wound around the central portion of the separator papers 3f, 3g. In this way, by winding two sheets of anodized foil 1a, 1b, one sheet of cathode foil 23, and two sheets of release paper 3f, 3g, the lead wire extraction terminals 6-9 are arranged in a quadrangular shape as shown in FIG. 1 or as shown in FIG. 13. of straight line. the

In addition, in the case of making the electrolytic capacitor 20 using two anodized foils 1a, 1b, one cathode foil 23, and two separator papers 3f, 3g, the anodized foil 1a can be set as the separator paper in FIG. 3f faces the cathode foil 23, and the anodized foil 1b is provided so as to face the cathode foil 23 through the separator 3g. the

18 is another perspective view showing the configuration of the electrolytic capacitor according to the second embodiment. The electrolytic capacitor of Embodiment 2 may be an electrolytic capacitor 20A shown in FIG. 18 . Referring to FIG. 18, the electrolytic capacitor 20A replaces the anodized foils 1a, 1b of the electrolytic capacitor 20 shown in FIG. 13 and FIG. 16 and the cathode lead 18, otherwise the same as the electrolytic capacitor 20. In addition, in the electrolytic capacitor 20A, a resin filler may be used instead of the rubber filler 16 . the

In the electrolytic capacitor 20A, the capacitive element 5 is composed of capacitive elements 5e, 5f, and 5g. The capacitive element 5e is provided on the innermost periphery, the capacitive element 5f is provided on the outer periphery of the capacitive element 5e, and the capacitive element 5g is provided on the outermost periphery. the

Fig. 19 is a plan view of anodized foils 24a to 24c, cathode foil 23, and separator papers 3f and 3g constituting electrolytic capacitor 20A shown in Fig. 18 . 19, in the electrolytic capacitor 20A, the lead wire extraction terminal 8 is connected to the cathode foil 23 at a position of L/3 from one end 23A of the cathode foil 23, and the lead wire extraction terminal 17 is located at the other end of the cathode foil 23. Portion 23B is connected to cathode foil 23 at a position of L/3. The lead wire extraction terminal 9 is connected to the cathode foil 23 at a position 2L/3 away from the lead wire extraction terminals 8 and 17, respectively. the

The anodized foil 24 consists of three anodized foils 24a, 24b, and 24c. In addition, the three anodized foils 24a, 24b, and 24c are each composed of an aluminum foil whose surface has been subjected to a synthesis treatment. The anodized foils 24a, 24b, 24c have a length of 2L/3 and a width of W, respectively. The lead wire extraction terminal 6 is connected to the anodized foil 24a at a distance of L/3 from one end 24A of the anodized foil 24a, and the lead wire extraction terminal 7 is connected to the anodized foil 24b at a distance of L/3 from one end 24B of the anodized foil 24b. Positionally connected to the anodized foil 24b, the lead wire extraction terminal 15 is connected to the anodized foil 24c at a position of L/3 from one end portion 24C of the anodized foil 24c. the

In the electrolytic capacitor 20A, the capacitive element 5e is composed of anodized foil 24a, cathode foil 23, and separator paper 3f, 3g; the capacitive element 5f is composed of anodized foil 24b, cathode foil 23, and separator paper 3f, 3g; It consists of chemical conversion foil 24c, cathode foil 23, and separator paper 3f, 3g. the

20 is a perspective view showing how to arrange anodized foils 24a, 24b, 24c, cathode foil 23, and separator papers 3f, 3g when manufacturing electrolytic capacitor 20A shown in FIG. 18 . Referring to FIG. 20 , cathode foil 23 is disposed between release paper 3f and release paper 3g. Three sheets of anodized foils 24a, 24b, 24c are arranged opposite to the cathode foil 23 via the release paper 3g. That is, three anodized foils 24a, 24b, and 24c are continuously provided in the winding direction DR1. In this case, three anodized foils 24a, 24b, 24c are arranged at a predetermined distance apart and electrically insulated from each other. the

3 sheets of anodized foils 24a, 24b, 24c, 1 sheet of cathode foil 23, and 2 sheets of release paper 3f, 3g are arranged according to the state shown in FIG. , and two sheets of release paper 3f, 3g are wound in the winding direction DR1 from the winding start ends 3A, 23A, 24A, and the capacitive element 5 composed of three capacitive elements 5e, 5f, 5g is manufactured. At the stage of winding the anodized foil 24a, the cathode foil 23 with a length of 2L/3, and the separator papers 3f and 3g with a length of 2L/3, the capacitive element 5e is produced, and after winding the anodized foil 24b, with a length of 2L/3 At the stage of the cathode foil 23 of the long 2L/3 part, and the release paper 3f, 3g of the long 2L/3 part, the capacitive element 5f is made, and the cathode foil 23 of the remaining long 2L/3 part of the winding anodized foil 24c, and the remaining long 2L At the stage of the release paper 3f and 3g of the /3 part, the capacitive element 5g is produced. the

Therefore, the capacitive element 5e is provided on the innermost peripheral side, the capacitive element 5f is provided on the outer peripheral side of the capacitive element 5e, and the capacitive element 5g is provided on the outermost peripheral side. the

Three sheets of anodized foil 24a, 24b, 24c, one sheet of cathode foil 23, and two sheets of separator paper 3f, 3g are wound to produce capacitor element 5, and then an electrolytic capacitor is produced by the same method as that of electrolytic capacitor 10. 20A. In the production of this electrolytic capacitor 20A, when a resin seal is used instead of the rubber packing 16, since the resin seal is easier to manufacture than the rubber packing 16, the process yield (productivity) can be improved. the

In the electrolytic capacitor 20A, since the capacitive elements 5e, 5f, and 5g are composed of an anodized foil and a cathode foil each having a length 2L/3 and a width W, they have a capacitance C1. In addition, the capacitive element 5 has the same effect as when the three capacitive elements 5e, 5f, and 5g are connected in parallel, so its capacity becomes 3C1 (=C0), which is the same as the capacity C0 of the conventional aluminum wound solid electrolytic capacitor 100. . the

Therefore, although the electrolytic capacitor 20A is fabricated using the anodized foils 24a, 24b, 24c having one-third the length of the previous anodized foil 110, and the cathode foil 23 having the same length as the previous cathode foil 120, its capacity The capacity is not lower than that of the conventional aluminum wound solid electrolytic capacitor 100 , and the equivalent series resistance is one third of that of the conventional aluminum wound solid electrolytic capacitor 100 . the

In addition, since the electrolytic capacitor 20A is produced by dividing the conventional anodized foil 110 into three anodized foils 24a, 24b, and 24c arranged continuously in the winding direction DR1, the diameter after winding is the same as that of the conventional aluminum wound solid electrolytic capacitor. 100 are roughly equal in diameter. That is, the electrolytic capacitor 20A with reduced equivalent series resistance can be produced without being larger in size than the conventional aluminum wound solid electrolytic capacitor 100 while maintaining the capacity.

Thus, by using one cathode foil 23 and three anodized foils 24a, 24b, and 24c, an electrolytic capacitor 20A having the same effect as when three capacitive elements 5e, 5f, and 5g are connected in parallel can be manufactured. the

FIG. 21 shows anodized foils 24a, 24b, 24c, cathode foil 23, and separator paper 3f, 3g when the electrolytic capacitor 20A shown in FIG. A perspective view of another configuration method. the

Referring to FIG. 21 , among the three anodized foils 24 a , 24 b , and 24 c , the anodized foil 24 a is disposed opposite to the cathode foil 23 via a release paper 3 f . The method of arranging the anodized foils 24b, 24c, the cathode foil 23, and the release papers 3f, 3g is the same as that shown in FIG. 20 . In this case, three anodized foils 24 a , 24 b , and 24 c are continuously provided in the winding direction DR1 , and two anodized foils 24 b , 24 c are provided at a predetermined distance from each other to be electrically insulated from each other. the

3 sheets of anodized foils 24a, 24b, 24c, 1 sheet of cathode foil 23, and 2 sheets of release paper 3f, 3g are arranged according to the state shown in FIG. , and two sheets of release paper 3f, 3g are wound in the winding direction DR1 from the winding start ends 3A, 23A, 24A, and the capacitive element 5 composed of three capacitive elements 5e, 5f, 5g is manufactured. At the stage of winding the anodized foil 24a, the cathode foil 23 with a length of 2L/3, and the separator papers 3f and 3g with a length of 2L/3, the capacitive element 5e is produced, and after winding the anodized foil 24b, with a length of 2L/3 At the stage of the cathode foil 23 of the long 2L/3 part, and the release paper 3f, 3g of the long 2L/3 part, the capacitive element 5f is made, and the cathode foil 23 of the remaining long 2L/3 part of the winding anodized foil 24c, and the remaining long 2L At the stage of the release paper 3f and 3g of the /3 part, the capacitive element 5g is produced. the

Therefore, the capacitive element 5e is provided on the innermost peripheral side, the capacitive element 5f is provided on the outer peripheral side of the capacitive element 5e, and the capacitive element 5g is provided on the outermost peripheral side. the

Three sheets of anodized foil 24a, 24b, 24c, one sheet of cathode foil 23, and two sheets of separator paper 3f, 3g are wound to produce capacitor element 5, and then an electrolytic capacitor is produced by the same method as that of electrolytic capacitor 10. 20A. the

In addition, in FIG. 21 , the case where the anodized foil 24a is disposed opposite to the cathode foil 23 through the release paper 3f among the three anodized foils 24a, 24b, and 24c has been described, but the present invention is not limited thereto, and 3 Among the anodized foils 24a, 24b, and 24c, the anodized foil 24b or the anodized foil 24c is arranged opposite to the cathode foil 23 via the separator paper 3f. the

FIG. 22 shows another example of the anodized foils 24a, 24b, 24c, the cathode foil 23, and the separator when the electrolytic capacitor 20A shown in FIG. A perspective view of the configuration method. the

Referring to FIG. 22, when using three anodized foils 24a, 24b, 24c and one cathode foil 23 to make the electrolytic capacitor 20A shown in FIG. 3h, 3i. the

The release papers 3h, 3i have the same length and the same width as the release papers 3f, 3g, respectively. The anodized foil 24a is arranged between the release paper 3g and the release paper 3h, so as to face the cathode foil 23 through the release paper 3g, and the anodized foil 24b is arranged between the release paper 3h and the release paper 3i, so that the cathode foil 23 passes through the release paper 3g, 3h Facing the cathode foil 23, the anodized foil 24c is provided to face the cathode foil 23 via separator papers 3g, 3h, and 3i. In this case, the anodized foils 24a, 24b, 24c are arranged consecutively in the winding direction DR1. the

3 sheets of anodized foil 24a, 24b, 24c, 1 sheet of cathode foil 23, and 4 sheets of release paper 3f, 3g, 3h, 3i are set according to the state shown in Figure 22, and 3 sheets of anodized foil 24a, 24b, 24c, 1 One cathode foil 23 and four separator papers 3f, 3g, 3h, 3i are wound in winding direction DR1 from winding start ends 3A, 23A, 24A to produce capacitive element 5 consisting of three capacitive elements 5e, 5f, 5g. At the stage of winding the anodized foil 24a, the cathode foil 23 of the long 2L/3 part, and the release paper 3f, 3g, 3h, 3i of the long 2L/3 part, the capacitive element 5e is made, and after winding the anodized foil 24b, the long At the stage of the cathode foil 23 of 2L/3 part, and the release paper 3f, 3g, 3h, 3i of the long 2L/3 part, the capacitive element 5f is produced, and the cathode of the remaining long 2L/3 part is wound and anodized into the foil 24c At the stage of foil 23 and the remaining separator papers 3f, 3g, 3h, and 3i of the length 2L/3, the capacitive element 5g is produced. the

Therefore, the capacitive element 5e is provided on the innermost peripheral side, the capacitive element 5f is provided on the outer peripheral side of the capacitive element 5e, and the capacitive element 5g is provided on the outermost peripheral side. the

After winding three sheets of anodized foil 24a, 24b, 24c, one sheet of cathode foil 23, and four sheets of separator paper 3f, 3g, 3h, and 3i to manufacture the capacitive element 5, the same method as that of the electrolytic capacitor 10 is used. An electrolytic capacitor 20A was fabricated. the

23 is another perspective view showing the configuration of the electrolytic capacitor according to the second embodiment. The electrolytic capacitor of Embodiment 2 may be an electrolytic capacitor 20B shown in FIG. 23 . the

Referring to FIG. 23 , electrolytic capacitor 20B is the same as electrolytic capacitor 20A except that cathode foil 23 of electrolytic capacitor 20A shown in FIG. 18 is replaced with cathode foils 2 a and 2 b . In addition, in the electrolytic capacitor 20B, a resin filler may be used instead of the rubber filler 16 . the

Fig. 24 is a plan view of anodized foils 24a to 24c, cathode foils 2a and 2b, and separator papers 3f and 3g constituting electrolytic capacitor 20B shown in Fig. 23 . 24, in the electrolytic capacitor 20B, the lead wire extraction terminal 8 is connected to the cathode foil 2a at a position of L/2 from one end 2A of the cathode foil 2a, and the lead wire extraction terminal 9 is connected to the other end of the cathode foil 2a. 2B, and the lead wire extraction terminal 17 is connected to the cathode foil 2b at a position of L/2 from the other end 2D of the cathode foil 2b. the

In the electrolytic capacitor 20B, the capacitive element 5e is composed of anodized foil 24a, cathode foil 2a, and separator paper 3f, 3g. The capacitive element 5f is composed of anodized foil 24b, cathode foil 2a, 2b, and separator paper 3f, 3g. It consists of anodized foil 24c, cathode foil 2b, and separator paper 3f, 3g. the

Fig. 25 is a perspective view showing how to arrange anodized foils 24a, 24b, 24c, cathode foils 2a, 2b, and separator papers 3f, 3g when manufacturing electrolytic capacitor 20B shown in Fig. 23 . Referring to Fig. 25, cathode foils 2a, 2b are disposed between separator paper 3f and separator paper 3g. Three sheets of anodized foils 24a, 24b, 24c are arranged opposite to the cathode foils 2a, 2b via a release paper 3g. That is, three anodized foils 24a, 24b, and 24c are continuously provided in the winding direction DR1. In this case, the three anodized foils 24a, 24b, 24c are provided at a predetermined distance and electrically insulated from each other, and the two cathode foils 2a, 2b are provided at a predetermined distance and are electrically insulated from each other. the

3 sheets of anodized foils 24a, 24b, 24c, 2 sheets of cathode foils 2a, 2b, and 2 sheets of release paper 3f, 3g are set according to the state shown in Figure 25, 3 sheets of anodized foils 24a, 24b, 24c, and 2 sheets of cathodes Foils 2a, 2b, and two release papers 3f, 3g are wound in winding direction DR1 from winding start ends 2A, 3A, 24A, and capacitive element 5 composed of three capacitive elements 5e, 5f, 5g is produced. At the stage of winding the anodized foil 24a, the cathode foil 2a of the long 2L/3 part, and the release paper 3f and 3g of the long 2L/3 part, the capacitive element 5e is made, and after winding the anodized foil 24b, the long L/3 part The cathode foil 2a of the long L/3 part, the cathode foil 2b of the long L/3 part, and the stages of the release paper 3f and 3g of the long 2L/3 part, make the capacitor element 5f, and wind the anodized foil 24c, and the remaining long 2L/3 part The capacitor element 5g is manufactured at the stage of the cathode foil 2b and the remaining separator paper 3f and 3g of the length 2L/3. the

Therefore, the capacitive element 5e is provided on the innermost peripheral side, the capacitive element 5f is provided on the outer peripheral side of the capacitive element 5e, and the capacitive element 5g is provided on the outermost peripheral side. the

Three sheets of anodized foils 24a, 24b, 24c, two sheets of cathode foils 2a, 2b, and two sheets of separator paper 3f, 3g are wound to make a capacitive element 5, and then the electrolytic capacitor 10 is made by the same method as that of the electrolytic capacitor 10. electrolytic capacitor 20B. In the production of this electrolytic capacitor 20B, when a resin seal is used instead of the rubber packing 16, since the resin seal is easier to manufacture than the rubber packing 16, the process yield (productivity) can be improved. the

In addition, in the manufacture of the electrolytic capacitor 20B, the three anodized foils 24a, 24b, 24c, the two cathode foils 2a, 2b, and the two release papers 3f, 3g may not be wound from the winding starting ends 2A, 3A, 24A, but Three sheets of anodized foils 24a, 24b, 24c, two sheets of cathode foils 2a, 2b, and two sheets of release paper 3f, 3g are wound from the center of the two sheets of separator paper 3f, 3g. In this way, by winding three sheets of anodized foils 24a, 24b, 24c, two sheets of cathode foils 2a, 2b, and two sheets of release paper 3f, 3g, the lead wire extraction terminals 6-9, 15, 17 are set as shown in FIG. line or other shape as shown. the

In the electrolytic capacitor 20B, since the capacitive elements 5e, 5f, and 5g are composed of an anodized foil and a cathode foil each having a length 2L/3 and a width W, they have a capacitance C1. In addition, the capacitive element 5 has the same effect as when the three capacitive elements 5e, 5f, and 5g are connected in parallel, so its capacity becomes 3C1 (=C0), which is the same as the capacity C0 of the conventional aluminum wound solid electrolytic capacitor 100. . the

Therefore, the electrolytic capacitor 20B, although using the anodized foils 24a, 24b, 24c having one-third the length of the previous anodized foil 110 and the cathode foils 2a, 2b having one-half the length of the previous cathode foil 120 production, its capacity will not be lower than that of the conventional aluminum wound solid electrolytic capacitor 100, and the equivalent series resistance is one-third of that of the conventional aluminum wound solid electrolytic capacitor 100. the

In addition, since the electrolytic capacitor 20B divides the previous anodized foil 110 into three anodized foils 24a, 24b, and 24c arranged continuously in the winding direction DR1, the previous cathode foil 120 is divided into three pieces continuously arranged in the winding direction DR1. Since two cathode foils 2a and 2b are produced, the diameter after winding is substantially equal to the diameter of the conventional aluminum wound solid electrolytic capacitor 100 . That is, it is possible to manufacture the electrolytic capacitor 20B with reduced equivalent series resistance, which is not larger in size than the conventional aluminum wound solid electrolytic capacitor 100, and maintains the capacity. the

Thus, by using two cathode foils 2a, 2b and three anodized foils 24a, 24b, 24c, an electrolytic capacitor 20B having the same effect as when three capacitive elements 5e, 5f, 5g are connected in parallel can be produced. the

Figure 26 shows the anodized foils 24a, 24b, 24c, cathode foils 2a, 2b and separators when using three anodized foils 24a, 24b, 24c and two cathode foils 2a, 2b to make the electrolytic capacitor 20B shown in Figure 23 A perspective view of another arrangement of paper. the

Referring to FIG. 26, when using three anodized foils 24a, 24b, 24c and two cathode foils 2a, 2b to make the electrolytic capacitor 20B shown in FIG. With release paper 3h. the

If the separator paper 3f, 3g is longer than the cathode foil 2a, 2b, it may be shorter than the separator paper 3h. The cathode foil 2a is provided between the separator paper 3g and the separator paper 3h so as to face the anodized foils 24a and 24b via the separator paper 3h. The cathode foil 2b is provided between the separator paper 3f and the separator paper 3g so as to face the anodized foils 24b and 24c via the separator paper 3g and 3h. the

3 sheets of anodized foils 24a, 24b, 24c, 2 sheets of cathode foils 2a, 2b, and 3 sheets of release paper 3f, 3g, 3h are set according to the state shown in Figure 26, and 3 sheets of anodized foils 24a, 24b, 24c, 2 One cathode foil 2a, 2b, and three release papers 3f, 3g, 3h are wound from winding start ends 2A, 3A, 24A in winding direction DR1 to produce capacitive element 5 composed of three capacitive elements 5e, 5f, 5g. In the stage of winding the cathode foil 2a of the anodized foil 24a, the long 2L/3 part, and the release paper 3f, 3g, and 3h of the long 2L/3 part, the capacitive element 5e is made, and after winding the anodized foil 24b, the long L/3 part 3 parts of the cathode foil 2a, the cathode foil 2b of the length L/3 part, and the release paper 3f, 3g, and 3h of the length 2L/3 part, the capacitive element 5f is made, and the remaining length of the foil 24c is wound and anodized Capacitance element 5g is produced at the stage of 2L/3 part of cathode foil 2b and the remaining 2L/3 part of separator paper 3f, 3g, 3h. the

Therefore, the capacitive element 5e is provided on the innermost peripheral side, the capacitive element 5f is provided on the outer peripheral side of the capacitive element 5e, and the capacitive element 5g is provided on the outermost peripheral side. the

After winding three sheets of anodized foil 24a, 24b, 24c, two sheets of cathode foil 2a, 2b, and three sheets of separator paper 3f, 3g, and 3h to manufacture the capacitive element 5, the electrolytic capacitor 10 is manufactured by the same method as that of the electrolytic capacitor 10. An electrolytic capacitor 20B was fabricated. the

In addition, in Fig. 26, the cathode foil 2a can be arranged between the release paper 3f and the release paper 3g, so that the anodized foils 24a, 24b are opposite through the release paper 3g, 3h, and the cathode foil 2b is arranged between the release paper 3g and the release paper. 3h, so that the anodized foils 24b and 24c face each other through the release paper 3h. the

In addition, in FIGS. 25 and 26, three anodized foils 24a, 24b, and 24c may be installed in the state shown in FIG. 22 . In this case, electrolytic capacitor 20B further has one sheet of separator paper 3h or two sheets of separator paper 3h, 3i. the

In addition, in the electrolytic capacitor 20B, the lead wire extraction terminal 9 may be provided in the one end portion 2C of the cathode foil 2b. the

Others are the same as Embodiment 1. the

In addition, in Embodiment 2 above, the cases where an electrolytic capacitor is fabricated using two anodized foils and one cathode foil, the case where an electrolytic capacitor is fabricated using three anodized foils and one cathode foil, and three anodized foils are used The case of making an electrolytic capacitor with two cathode foils has been described, but the present invention is not limited thereto. The electrolytic capacitor according to Embodiment 2, as long as it uses i (i is an integer greater than or equal to 2) sheets of anodized foil, and less than An electrolytic capacitor made of j (j is an integer satisfying 1≦j<i) sheets of cathode foils anodized into foils may be sufficient. the

In Embodiment 1 above, the case where an electrolytic capacitor is manufactured using a plurality of anodized foils and a plurality of cathode foils of the same number has been described. The case where an electrolytic capacitor is produced by a plurality of cathode foils according to the number of foils has been described. the

Therefore, the electrolytic capacitor of the present invention can generally be formed by using i sheets of anodized foil, j (j is an integer satisfying 1≤j<i) sheets of cathode foil, and k (k is an integer of 2 or more) sheets of separator paper. fabricated electrolytic capacitors. In addition, i sheets of anodized foils are electrically insulated from each other, and j sheets of cathode foils are electrically insulated from each other when composed of a plurality of cathode foils. the

All aspects of the embodiments described here are merely examples. The present invention is shown by the scope of the claims rather than the description of the above-mentioned embodiments, and includes all changes within the scope of the claims, equivalent meanings and the range. the

The invention is suitable for electrolytic capacitors capable of stably reducing equivalent series resistance. the

Claims (6)

1. An electrolytic capacitor is a winding electrolytic capacitor comprising a capacitive element and an electrolyte, characterized in that, The above capacitive element has: Two anode parts that are electrically insulated from each other and each have a dielectric coating on the surface; 1 sheet of cathode parts wound together with the above 2 sheets of anode parts; and At least two spacer members disposed between the two anode members and the one cathode member, and wound together with the two anode members and the one cathode member, The capacitive element is formed by winding the anode member, the cathode member, and the separator with the central portion of the separator member in the longitudinal direction as a winding start portion. 2. The electrolytic capacitor as claimed in claim 1, characterized in that: The two anode members, the one cathode member, and the two separator members constitute a plurality of capacitors having different capacitances. 3. The electrolytic capacitor according to claim 1 or 2, characterized in that: It also has a sealing member that seals the capacitive element formed by winding the two anode members, the one cathode member, and the two spacers; The sealing member is made of resin. 4. The electrolytic capacitor according to claim 1 or 2, characterized in that: It also has a sealing member that seals the capacitive element formed by winding the two anode members, the one cathode member, and the two spacers; The sealing member is made of rubber. 5. The electrolytic capacitor according to claim 1 or 2, wherein also has: Corresponding to the above two anode parts, two anode lead wires respectively connected to the approximate central part of the corresponding anode part in the length direction of the corresponding anode part; Corresponding to the above-mentioned one cathode part, two cathode leads are respectively connected to the approximate central part of the above-mentioned corresponding cathode part in the length direction of the corresponding cathode part; an anode terminal connected to the above 2 anode leads; and a cathode terminal connected to the above 2 cathode leads, The other end of the two anode lead wires on the opposite side to the one end connected to the two anode parts is connected to the anode terminal; The other end of the two cathode leads opposite to the one end connected to the one cathode member is connected to the cathode terminal. 6. The electrolytic capacitor according to claim 1 or 2, characterized in that: The above-mentioned electrolyte is a polythiophene, polypyrrole, and polyaniline conductive polymer, or a solid electrolyte composed of 7, 7, 8, 8-tetracyanoquinodimethane complexes.

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