JP2011054604A - Electrolytic capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrolytic capacitor preventing positional displacement of an anode (a cathode) lead tab terminal while maintaining characteristics as an electrolytic capacitor. <P>SOLUTION: An electrolytic capacitor includes: an anode foil 3 and a cathode foil 4; first and second anode lead tab terminals 11, 12; and a cathode lead tab terminal 13. Each of the first and second anode lead tab terminals 11, 12 includes an anode connection portion and an anode lead. The second anode lead tab terminal 12 is connected to a portion of the anode foil 3 corresponding to a second position in a circumferential direction after winding up a closest portion of the anode foil 3 corresponding to the second position in the circumferential direction with respect to a first position in the circumferential direction and further winding up the anode foil 3 by at least one turn. At least one of the first and second anode lead tab terminals 11, 12 is formed such that the position in the radial direction of the anode lead is different from the position in the radial direction of the anode connection portion in a state where the anode foil 3 is wound up. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electrolytic capacitor, and more particularly to an electrolytic capacitor in which an anode foil and a cathode foil are wound.

  One form of electrolytic capacitor is an electrolytic capacitor formed by winding an anode foil and a cathode foil with separator paper interposed therebetween.

  Here, a manufacturing method of an electrolytic capacitor having a two-terminal (anode 1 terminal + cathode 1 terminal) structure will be described as such a wound electrolytic capacitor. First, as shown in FIG. 21, a strip-like anode foil 103, a cathode foil 104, and two separator papers 105 and 106 each having a predetermined length are prepared. For example, an aluminum foil on which a dielectric oxide film is formed is applied as the anode foil, and an aluminum foil is applied as the cathode foil.

  An anode lead tab terminal 110 is connected to a predetermined position in the longitudinal direction of the anode foil 103, and a cathode lead tab terminal 113 is connected to a predetermined position in the longitudinal direction of the cathode foil 104. As shown in FIGS. 22 and 23, the positive (negative) lead tab terminals 110 and 113 have a cylindrical boss portion 116 a and a plate-like connection portion 116 b connected to the positive (negative) foils 103 and 104. And a cylindrical lead wire 116c serving as a positive (negative) electrode terminal.

  As shown in FIG. 21, in the anode foil 103 and the cathode foil 104, one separator paper 105 is sandwiched between the anode foil 103 and the cathode foil 104, and one separator paper 105 and the other separator paper 106 are The anode foil 103 is disposed between the two.

  Next, as shown in FIG. 24, one end side of the disposed anode foil 103, cathode foil 104, and separator paper 105, 106 is sandwiched between the cores 131a, 131b. Next, the winding cores 131a and 131b are rotated clockwise (clockwise) in this state, whereby the anode foil 103 and the cathode foil 104 are wound from one end side to form a winding type electrolytic capacitor. Will be.

  By the way, an electrolytic capacitor has an inductance component called equivalent series inductance (ESL). The ESL increases as the frequency increases, and the electrolytic capacitor cannot exhibit the function as a capacitor. For this reason, lower ESL is calculated | required for the electrolytic capacitor used in a high frequency area | region. Further, the electrolytic capacitor has a resistance component called Equivalent Series Resistance (ESR), and a lower ESR is required.

  In order to reduce ESR and ESL, there is a multi-terminal electrolytic capacitor having a plurality of lead tab terminals as lead tab terminals. Next, a manufacturing method of an electrolytic capacitor having a three-terminal (anode 2 terminal + cathode 1 terminal) structure as such a multi-terminal electrolytic capacitor will be described.

  As shown in FIG. 25, the first anode lead tab terminal 111 and the second anode lead tab terminal 112 are respectively connected to predetermined positions in the longitudinal direction of the anode foil 103, and the cathode lead tab terminal is disposed at a predetermined position in the longitudinal direction of the cathode foil 104. 113 is connected. The anode foil 103 and the cathode foil 104 are arranged in the same manner as in the case of a two-terminal electrolytic capacitor, and one end side thereof is sandwiched between the cores 131a and 131b (see FIG. 24). In this state, the winding cores 131a and 131b are rotated clockwise to wind up the anode foil 103 and the cathode foil 104 from one end side, and the capacitor element 102 is formed as shown in FIG.

  Next, the capacitor element 102 is subjected to a predetermined process such as a chemical conversion process on the cut surfaces of the anode foil 103 and the cathode foil 104. Next, the sealing rubber packing 122 (see FIG. 27) is attached to the capacitor element 102. In the sealing rubber packing 122, three openings 122a (see FIG. 27) corresponding to the positions of the lead tab terminals 111, 112, and 113 are formed. The sealing rubber packing 122 is attached to the capacitor element 102 in such a manner that the lead wires 116c of the lead tab terminals 111, 112, 113 are inserted into the opening 122a.

  The capacitor element 102 to which the sealing rubber packing 122 is attached is housed in a bottomed aluminum case 120 (see FIG. 27) having a predetermined size. Next, the opening end side of the aluminum case 120 is sealed with a lateral diaphragm and a curl, and a predetermined aging process is performed. Next, a plastic seat plate 124 is attached to the curled surface of the aluminum case 120. In the seat plate 124, three openings 124a (see FIG. 27) corresponding to the positions of the lead tab terminals 111, 112, and 113 are formed.

  Thereafter, as shown in FIG. 27, the lead wire 116c protruding from the opening 124a of the seat plate 124 is used as an electrode terminal, and press processing and bending processing are performed to complete the electrolytic capacitor 101 having a three-terminal structure. Patent Document 1 is an example of a document disclosing an electrolytic capacitor having a multi-terminal structure such as 2 to 4 terminals.

JP 2004-179621 A

  However, the inventors have clarified that the conventional multi-terminal structure electrolytic capacitor has the following problems.

  As described above, a lower ESL is required particularly for an electrolytic capacitor used in a high frequency region. Since this ESL depends on the pitch of the lead wire of the positive (negative) lead tab terminal, in order to reduce the ESL, each pitch of the three lead wires is set to the same pitch, and each positive (negative) lead tab. It is required to arrange the terminals in a balanced manner.

  That is, when the electrolytic capacitor 101 is viewed from the positive (negative) lead tab terminal side, the first anode lead tab terminal 111, the second anode lead tab terminal 112, and the cathode lead tab terminal 113 are arranged at positions corresponding to the vertices of the equilateral triangle. Desired.

  Here, as shown in FIG. 28, it is assumed that two anode lead tab terminals 111 and 112 are arranged on a single anode foil 103 at a position corresponding to the apex of an equilateral triangle after winding. Then, the distance PL between the two anode lead tab terminals 111 and 112 becomes shorter as the diameter of the electrolytic capacitor becomes smaller. For example, in an electrolytic capacitor having a diameter of 6.3 mm, the distance PL between the two anode lead tab terminals 111 and 112 needs to be set to several mm.

  However, in an electrolytic capacitor having a diameter of 6.3 mm, the length L of the anode foil 103 is about 60 to 70 mm. Therefore, an interval (distance PL) of about several mm is separated from the anode foil 103 having such a length L. Thus, it becomes difficult to connect the two anode lead tab terminals 111 and 112 with high accuracy.

  On the other hand, in order to keep ESR low, the resistance value of the anode foil portion extending to one side and the resistance value of the anode foil portion extending to the other side to the anode lead tab terminal connected to the anode foil are the same. It is desirable to connect the anode lead tab terminal to the anode foil.

  That is, the two anode lead tab terminals have a distance half the distance (distance PL), a distance between one end of the anode foil and the nearest anode lead tab terminal, and a distance between the other end of the anode foil and the nearest anode lead tab terminal. It is desirable that they are arranged so as to be approximately equal. For this reason, if two anode lead tab terminals are brought close to each other and connected to one anode foil, it becomes substantially the same as the case where one anode lead tab terminal is connected. In the region, characteristics as an electrolytic capacitor are impaired.

  Therefore, the inventor performed the following evaluation in order to secure such a gap between the two anode lead tab terminals in order to solve such a problem. First, the circumferential position where the first anode lead tab terminal is disposed in the state where the anode foil or the like is wound is defined as the first circumferential position, and the circumferential position where the second anode lead tab terminal is disposed. Is a second circumferential position.

  As shown in FIG. 29, as the anode foil 103, the interval PL between the first anode lead tab terminal 111 and the second anode lead tab terminal 112 is set to a portion of the anode foil 103 corresponding to the first circumferential direction position, and the first circumferential direction. The portion of the anode foil 103 corresponding to the second circumferential direction position after winding the portion of the anode foil 103 nearest to the position corresponding to the second circumferential direction position and winding the anode foil 103 for another round An anode foil 103 set to be spaced from the portion was prepared.

  When the winding evaluation was performed using the anode foil 103 or the like, the radial position of the second anode lead tab terminal 112 was shifted from the radial position of the first anode lead tab terminal 111 as shown in FIG. It has been found that a new problem occurs. When the radial position of the second anode lead tab terminal 112 coincides with the radial position of the first anode lead tab terminal 111, that is, each positive pitch of the three lead wires 116c is set to the same pitch. A (negative) pole lead tab terminal is shown by a dotted line in FIG.

  As described above, in the wound electrolytic capacitor, the anode foil, the cathode foil, and the two separator papers are sandwiched between the one ends by the winding core, and are wound from the one end in this state. For this reason, after the second round, the anode foil or the like is further wound on the portion of the anode foil or the like that has been wound up to that point.

  Then, even if the circumferential position is the same, the radial position differs between the part wound up at the beginning and the part wound up at the end, and the diameter from the beginning (center) of winding is increased as the winding is performed later. The direction distance becomes longer. Therefore, as shown in FIG. 30, in the circumferential direction, the second anode lead tab terminal 112 is disposed at a predetermined second circumferential position with respect to the first circumferential position where the first anode lead tab terminal 111 is disposed. However, in the radial direction, it is arranged outside the radial position when connected to the portion of the anode foil 103 closest to the second circumferential position with respect to the first circumferential position. That is, the second anode lead tab terminal 112 is disposed outside the radial position of the first anode lead tab terminal 111.

  As a result, in the capacitor element 102 wound with the anode foil or the like, the two anode lead tab terminals 111 and 112 and the cathode lead tab terminal 113 are not arranged at positions corresponding to the apexes of the equilateral triangle.

  If the two anode lead tab terminals 111 and 112 are displaced from the positions corresponding to the vertices of the equilateral triangle, the pitch between the positive (negative) electrode lead tab terminals 111, 112, and 113 changes, and the ESL increases and the electrolytic capacitor As a result, the characteristics will deteriorate. Further, it becomes difficult to insert each positive (negative) lead tab terminal 111, 112, 113 into the opening 122 a of the sealing rubber packing 122 or the opening 124 a of the seat plate 124, and the productivity is hindered. Become.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electrolytic capacitor in which the position deviation of the positive (negative) lead tab terminal is eliminated while maintaining the characteristics as an electrolytic capacitor. It is to be.

  The electrolytic capacitor according to the present invention is an electrolytic capacitor in which a strip-like anode foil and a cathode foil are wound, respectively. The anode foil and the cathode foil, the first anode lead tab terminal, the second anode lead tab terminal, and one piece A cathode lead tab terminal. The anode foil and the cathode foil are wound in a predetermined direction while facing each other from one end side in the longitudinal direction. The first anode lead tab terminal is connected to a portion of the anode foil that is separated from the one end side of the anode foil by a first distance, and is disposed at a predetermined first circumferential position in a wound state. The second anode lead tab terminal is connected to the portion of the anode foil that is separated from the one end side of the anode foil by a second distance longer than the distance of the first distance, and is wound with respect to the first circumferential position. It is arranged at a predetermined second circumferential position. The cathode lead tab terminal is connected to a portion of the cathode foil that is separated from the one end side of the cathode foil by a third distance, and in a wound state, the cathode lead tab terminal has a predetermined third relative to the first circumferential position and the second circumferential position. It is arranged at a circumferential position. Each of the first anode lead tab terminal and the second anode lead tab terminal includes an anode connecting portion connected in a manner of contacting with the anode foil, and an anode lead wire electrically connected to the anode connecting portion to become an anode terminal. . The cathode lead tab terminal includes a cathode connection portion connected in a manner of being brought into contact with the cathode foil, and a cathode lead wire that is electrically connected to the cathode connection portion and serves as a cathode terminal. The second anode lead tab terminal is connected from the portion of the anode foil corresponding to the first circumferential position to the portion of the anode foil corresponding to the second circumferential position after winding the anode foil by a predetermined length. . At least one anode lead tab terminal of the first anode lead tab terminal and the second anode lead tab terminal is in a position where the radial position of the anode lead wire is different from the radial position of the anode connecting portion in a state where the anode foil is wound. The first type is formed as described above.

  Other electrolytic capacitors according to the present invention each have a strip-like anode foil and cathode foil that are wound, and three lead tab terminals. Each of the three lead tab terminals includes a connection portion connected in a manner of contacting either the anode foil or the cathode foil and a lead wire that is electrically connected to the connection portion and becomes a terminal. The three lead tab terminals include a lead tab terminal in which the lead wire is disposed at the same radial position as the connection portion in a state where the anode foil and the cathode foil are wound, and the lead wire is in the radial direction with respect to the connection portion. And a lead tab terminal arranged in a shifted position.

  Still another electrolytic capacitor according to the present invention has a strip-like anode foil and cathode foil each wound and three lead tab terminals. Each of the three lead tab terminals includes a connection portion connected in a manner of contacting either the anode foil or the cathode foil and a lead wire that is electrically connected to the connection portion and becomes a terminal. The three lead tab terminals include a lead tab terminal having a mode in which the lead wire is disposed at a position where the radial position is shifted outward with respect to the connection portion in a state where the anode foil and the cathode foil are wound, and the lead wire Includes a lead tab terminal arranged in a position shifted inward in the radial direction with respect to the connecting portion.

  According to the electrolytic capacitor of the present invention, at least one of the first anode lead tab terminal and the second anode lead tab terminal is in a state where the anode foil is wound, and the radial position of the anode lead wire is the radial direction of the anode connecting portion. It is formed to be a position different from the position. Accordingly, at least one of shifting the radial position of the anode lead wire of the first anode lead tab terminal to the outer peripheral side and shifting the radial position of the anode lead wire of the second anode lead tab terminal to the inner peripheral side. Is possible. For this reason, even if the radial position of the anode connecting portion of the first anode lead tab terminal is arranged on the inner peripheral side with respect to the radial position of the anode connecting portion of the second anode lead tab terminal, the anode lead of the first anode lead tab terminal The radial position of the wire and the radial position of the lead wire of the second anode lead tab terminal can be brought close to each other. Therefore, since the lead wire of the first anode lead tab terminal can be arranged at a position corresponding to the apex of the substantially equilateral triangle, the positional deviation of the anode lead tab terminal can be eliminated. Further, since the pitches of the three positive (negative) electrode lead wires of the first and second anode lead tab terminals and the cathode lead tab terminal are substantially constant, the ESL can be reduced and the characteristics as an electrolytic capacitor can be maintained. it can.

  According to another electrolytic capacitor according to the present invention, the three lead tab terminals include a lead tab terminal in a mode in which the lead wire is disposed at the same radial position as the connection portion in a state where the anode foil and the cathode foil are wound. And a lead tab terminal in a form in which the lead wire is disposed at a position shifted in the radial direction with respect to the connecting portion. Thereby, the radial position of the lead wire of the lead tab terminal can be matched. As a result, alignment at the time of manufacture becomes easy, and characteristics as an electrolytic capacitor can be maintained.

  In still another electrolytic capacitor according to the present invention, the three lead tab terminals are arranged at positions where the lead wire is shifted outward in the radial direction with respect to the connecting portion in a state where the anode foil and the cathode foil are wound. And a lead tab terminal of a mode in which the lead wire is disposed at a position where the radial position is shifted inward with respect to the connecting portion. Thereby, the radial position of the lead wire of the lead tab terminal can be matched. As a result, alignment at the time of manufacture becomes easy, and characteristics as an electrolytic capacitor can be maintained.

It is a side view which shows the both-sides press terminal applied to the electrolytic capacitor which concerns on Embodiment 1 of this invention. In the embodiment, it is a side view showing a single-side press terminal applied to an electrolytic capacitor, (A) is a side view showing a single-side press terminal according to an example, (B) is a single-side press according to another example It is a side view which shows a terminal. In the same embodiment, it is a perspective view which shows the connection aspect to the positive (negative) electrode foil, and the arrangement | positioning aspect of a positive (negative) electrode foil and a separator of a positive (negative) electrode lead tab terminal. In the same embodiment, it is a fragmentary perspective view which shows 1 process of the manufacturing method of an electrolytic capacitor. FIG. 5 is a perspective view showing a step performed after the step shown in FIG. 4 in the same embodiment. FIG. 6 is a perspective view showing a step performed after the step shown in FIG. 5 in the same embodiment. FIG. 7 is a perspective view showing a step performed after the step shown in FIG. 6 in the same embodiment. FIG. 8 is a cross-sectional view showing a step performed after the step shown in FIG. 7 in the same embodiment. FIG. 9 is a top view of the step shown in FIG. 8 in the same embodiment. In the same embodiment, it is a top view which shows the arrangement | positioning relationship of a positive (negative) pole tab terminal. 11 is a cross-sectional view taken along a cross-sectional line XI-C-XI shown in FIG. 10 and a cross-sectional view corresponding to the same cross-sectional line in an electrolytic capacitor according to a comparative example in the embodiment. It is a perspective view which shows the connection aspect to the positive (negative) electrode foil, and the arrangement | positioning aspect of a positive (negative) electrode foil and a separator in the electrolytic capacitor which concerns on Embodiment 2 of this invention. . In the same embodiment, it is a top view which shows the arrangement | positioning relationship of a positive (negative) pole tab terminal. FIG. 14 is a cross-sectional view taken along a cross-sectional line XIV-C-XIV shown in FIG. 13 and a cross-sectional view corresponding to the same cross-sectional line in an electrolytic capacitor according to a comparative example in the embodiment. It is a perspective view which shows the connection aspect to the positive (negative) electrode foil, and the arrangement | positioning aspect of a positive (negative) electrode foil and a separator in the electrolytic capacitor which concerns on Embodiment 3 of this invention. . In the same embodiment, it is a top view which shows the arrangement | positioning relationship of a positive (negative) pole tab terminal. FIG. 17 is a cross-sectional view taken along a cross-sectional line XVII-C-XVII shown in FIG. 16 and a cross-sectional view corresponding to the cross-sectional line of the electrolytic capacitor according to the comparative example in the embodiment. FIG. 11 is a cross-sectional view corresponding to a cross-sectional line XI-C-XI shown in FIG. 10 in an electrolytic capacitor according to a modification, and a cross-sectional view corresponding to the same cross-sectional line in an electrolytic capacitor according to a comparative example. It is sectional drawing corresponding to sectional line XIV-C-XIV shown in FIG. 13 in the electrolytic capacitor which concerns on a modification, and sectional drawing corresponding to the same sectional line in the electrolytic capacitor which concerns on a comparative example. It is sectional drawing corresponding to sectional line XVII-C-XVII shown in FIG. 16 in the electrolytic capacitor which concerns on a modification, and sectional drawing corresponding to the same sectional line in the electrolytic capacitor which concerns on a comparative example. It is a perspective view which shows the connection aspect to the positive (negative) electrode foil, and the arrangement | positioning aspect of a positive (negative) electrode foil and a separator in the electrolytic capacitor which concerns on a 1st prior art. It is a perspective view which shows a both-sides press terminal. It is a side view which shows a both-sides press terminal. It is a fragmentary perspective view which shows 1 process of the manufacturing method of the electrolytic capacitor which concerns on a 1st prior art. It is a perspective view which shows one process in the manufacturing method of the electrolytic capacitor which concerns on a 2nd prior art. FIG. 26 is a perspective view showing a step performed after the step shown in FIG. 25. FIG. 27 is a cross-sectional view showing a step performed after the step shown in FIG. 26. It is a side view which shows the 1st example of the connection aspect to the anode foil of an anode lead tab terminal. It is a side view which shows the 2nd example of the connection aspect to the anode foil of an anode lead tab terminal. It is a top view which shows the arrangement | positioning relationship of an anode lead tab terminal for demonstrating the problem of the conventional electrolytic capacitor.

(Embodiment 1)
Here, a description will be given of an electrolytic capacitor in which a both-side press terminal is applied as the first anode lead tab terminal and a one-side press terminal is applied as the second anode lead tab terminal.

  As shown in FIG. 1, the both-side press terminals 16 are formed in two substantially the same shape with respect to the lead wire 16 c by two identical molds, and have a cylindrical boss portion 16 a, a positive (negative) electrode foil. A plate-like connecting portion 16b connected to the electrode and a columnar lead wire 16c serving as a positive (negative) electrode terminal are molded. The lead wire 16c is provided on one end side of the boss portion 16a, and the connection portion 16b is provided on the other end side of the boss portion 16a. In FIG. 1, the plate-like connection portions 16b are arranged in a direction perpendicular to the paper surface.

  On the other hand, as shown in FIGS. 2 (A) and 2 (B), the one-side press terminal 18 is formed into an asymmetric shape with respect to the lead wire 16c mainly by one of the two same dies. FIG. 2A shows a one-side press terminal in which the shift amount (distance S1) of the lead wire 18c with respect to the connecting portion 18b is relatively small, and FIG. 2B shows the shift amount (distance S2). A one-side press terminal having a relatively large is shown. Each of the one-side press terminals 18 is formed with a cylindrical boss portion 18a, a plate-like connection portion 18b connected to the anode foil, and a cylindrical lead wire 18c serving as an anode terminal. The lead wire 18c is provided on one end side of the boss portion 18a, and the connecting portion 18b is provided on the other end side of the boss portion 18a.

  In FIG. 2, the plate-like connecting portions 18b are arranged in a direction perpendicular to the paper surface. Further, in this one-side press terminal 18, as a connection surface to the anode foil, for the sake of explanation, the connection surface of the connection portion 18b located on the side opposite to the side where the lead wire 18c is shifted with respect to the connection portion 18b is the first. The connection surface of the connection portion 18b located on the side where the lead wire 18c is shifted is defined as a first connection surface 18d, and is defined as a second connection surface 18e. As will be described later, in the one-side press terminal 18, the lead wire 18c and the boss portion 18a can be arranged at a position shifted in the radial direction from the position of the connection portion 18b connected to the anode foil.

  Next, a method for manufacturing an electrolytic capacitor will be described. First, as shown in FIG. 3, both-side press terminals 16 are connected as first anode lead tab terminals 11 and one-side press terminals 18 are connected as second anode lead tab terminals 12 at predetermined positions in the longitudinal direction of the anode foil 3. . Further, the both-side press terminal 16 is connected as a cathode lead tab terminal 13 to a predetermined position in the longitudinal direction of the cathode foil 4.

  At this time, the first anode lead tab terminal 11 was wound at a predetermined distance (first distance) from one end side of the anode foil 3 (in this embodiment, the left side of the anode foil 3 in FIG. 3). It is connected to the portion of the anode foil 3 that is to be disposed at a predetermined first circumferential position. Further, the second anode lead tab terminal 12 is separated from the one end side of the anode foil by a distance longer than a predetermined distance (second distance), and in a wound state, the second anode lead tab terminal 12 has a predetermined second with respect to the first circumferential direction position. It is connected to the part of the anode foil 3 that is to be arranged in the circumferential position.

  The distance PL between the first anode lead tab terminal 11 and the second anode lead tab terminal 12 is the second circumference with respect to the portion of the anode foil 3 corresponding to the first circumferential position in the anode foil 3 and the first circumferential position. The portion of the anode foil 3 nearest to the direction position is wound up, and further, the distance from the portion of the anode foil 3 corresponding to the second circumferential direction position after winding the anode foil 3 for another turn is set. The

  Further, the cathode lead tab terminal 13 is separated from the one end side of the cathode foil 4 by a predetermined distance (third distance), and in a wound state, the cathode lead tab terminal 13 has a predetermined distance with respect to the first circumferential position and the second circumferential position. It is connected to the portion of the cathode foil 4 to be arranged at the third circumferential position.

  Here, the circumferential direction means a circumferential direction centering on one end side of the anode foil 3 and the cathode foil 4 or the like that is the starting point of winding, and the radial direction is a circumferential direction from the center portion. Means a direction substantially orthogonal to

  Next, as shown in FIG. 3, the anode foil 3 and the cathode foil 4 have one separator paper 5 sandwiched between the anode foil 3 and the cathode foil 4, and one separator paper 5 and the other separator paper. The anode foil 3 is sandwiched between the anode foil 3 and the anode foil 6.

  Next, as shown in FIG. 4, one end side of the arranged anode foil 3, cathode foil 4 and separator paper 5, 6 is sandwiched between the core 31 a and the core 31 b as indicated by an arrow 51. Next, in this state, as shown by the arrow 52, the winding cores 31a and 31b are rotated clockwise (clockwise), whereby the first anode lead tab terminal 11, the second anode lead tab terminal 12, and the cathode lead tab terminal 13 are rotated. However, the anode foil 3 and the cathode foil 4 are wound from one end side in a mode located on the inner peripheral surface of the positive (negative) foil 3, 4 to form the capacitor element 2 as shown in FIG. Is done.

  Next, the capacitor element 2 is subjected to chemical conversion treatment on the cut surface of the anode foil or the like, and further subjected to heat treatment at a temperature of about 150 ° C. to 300 ° C. Next, as a monomer that becomes a conductive polymer by polymerization, for example, a mixed solution of 3,4-ethylenedioxythiophene and an oxidant solution, for example, p-toluenesulfonic acid ferric alcohol solution is used as a capacitor element. 2 is impregnated. Then, a conductive polymer layer (not shown) is formed between both electrodes of the capacitor element 2 by thermochemical polymerization. In addition, as the electrolyte, for example, a conductive polymer material such as polypyrrole, polyfuran, or polyaniline, or a TCNQ complex salt (7,7,8,8-tetracyanoquinodimethane) may be used. Good.

  Next, as shown in FIG. 6, the sealing rubber packing 22 is attached to the capacitor element 2. In the sealing rubber packing 22, three openings 22 a are formed at predetermined positions corresponding to the first anode lead tab terminal 11, the second anode lead tab terminal 12, and the cathode lead tab terminal 13. As shown in FIG. 7, the rubber packing 22 for sealing includes the lead wires 16c and 18c and the boss portions 16a and 18a of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 corresponding to the opening 22a. The capacitor element 2 is attached by being inserted into the capacitor element 2.

  Next, the capacitor element 2 to which the sealing rubber packing 22 is attached is accommodated in a bottomed aluminum case 20 (see FIG. 8) having a predetermined size. Next, the opening end side of the aluminum case 20 is sealed with a lateral diaphragm and a curl, and a predetermined aging process is performed. Next, a plastic seat plate 24 is attached to the curled surface of the aluminum case 20.

  As shown in FIG. 9, the seat plate 24 is formed with three openings 24 a corresponding to the positions of the first and second anode lead tab terminals 11, 12 and the cathode lead tab terminal 13. The seat plate 24 is attached to the capacitor element 2 by inserting the lead wires 16c and 18c of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 through the corresponding openings 24a. Thereafter, as shown in FIGS. 8 and 9, the lead wires 16 c and 18 c protruding from the opening 24 a of the seat plate 24 are used as electrode terminals, and press processing and bending processing are performed. Is completed.

  In the electrolytic capacitor described above, the one-side press terminal 18 is applied as the second anode lead tab terminal 12, thereby shifting the radial direction position of the lead wire 18 c to the inside, and the first anode lead tab terminal 11 and the cathode lead tab terminal 13. It can be matched with the radial position of the lead wire 16c of the (both side press terminals 16).

  This will be described. First, as a comparative example, when a double-side press terminal is applied as the first anode lead tab terminal and a double-side press terminal is applied as the second anode lead tab terminal, as shown in FIG. 10, the second anode lead tab terminal 112 (lead wire) 116c) is arranged in a predetermined second circumferential position with respect to the first circumferential position where the first anode lead tab terminal 111 (lead wire 116c) is arranged in the circumferential direction, but positive ( 2) The second anode lead tab terminal 112 (lead wire 116c) is disposed outside the radial position of the first anode lead tab terminal 111 (lead wire 116c) by the amount of winding of the electrode foils 3, 4 etc. It will be. In addition, in FIG. 10 etc., the center part C shows the one end side of the anode foil 3 and the cathode foil 4 etc. which are the starting points of winding. A cross-sectional structure of the electrolytic capacitor according to this comparative example is shown in the lower part of FIG.

  On the other hand, in the above-described electrolytic capacitor, as shown in the upper part of FIG. 11, the one-side press terminal 18 is applied as the second anode lead tab terminal 12, and the first connection surface 18d of the connection portion 18b is the anode. The one-side press terminal 18 is connected to the anode foil 3 in a manner in contact with the inner peripheral surface 3 a of the foil 3. Therefore, although the radial position of the connecting portion 18b is not different from the radial position of the connecting portion 116b when the both-side press terminals 116 are applied, the radial position of the lead wire 18c (boss portion 18a) is as shown in FIG. Distance from the radial position of the lead wire 116c (boss portion 116a) when the both-side press terminals 116 shown in the lower stage are applied to the center (start of winding of the anode foil 3 and the like) C side (inside) of the capacitor element 2 Shift by S.

  As a result, as shown in FIG. 10, the radial position of the lead wire 18 c (boss portion 18 a) of the one-side press terminal 18 as the second anode lead tab terminal 12 shifts inward, and both sides as the first anode lead tab terminal 11. The lead wires 16c and 18c of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 are aligned with the radial position of the lead wire 16c (boss portion 16a) of the press terminal 16 at the apex of the equilateral triangle. It can be arranged at a corresponding position. The planar arrangement pattern of the lead wires 16c and 18c is not limited to an equilateral triangle, but the angle θ formed by one vertex is preferably 20 to 140 °, more preferably around 60 °. The planar arrangement pattern refers to an arrangement pattern of lead wires when the side where the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 protrude in the electrolytic capacitor 1 is viewed in plan view.

  As a result, the pitch between each of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 is substantially constant, the ESL is reduced, and the characteristic of the electrolytic capacitor is prevented from being deteriorated. it can. Further, the lead wires and bosses of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 are easily inserted into the opening 22a of the sealing rubber packing 22 and the opening 24a of the seat plate 24. And productivity can be improved. As described above, since a three-terminal electrolytic capacitor that can suppress deterioration of characteristics as an electrolytic capacitor and can improve productivity can be realized, the electrolytic capacitor can be reduced in size.

(Embodiment 2)
Here, an electrolytic capacitor will be described in which a single-side press terminal is applied as the first anode lead tab terminal and a double-side press terminal is applied as the second anode lead tab terminal.

  First, as shown in FIG. 12, a one-side press terminal 18 is connected as a first anode lead tab terminal 11 and a both-side press terminal 16 is connected as a second anode lead tab terminal 12 at a predetermined position in the longitudinal direction of the anode foil 3. . Further, the both-side press terminal 16 is connected as a cathode lead tab terminal 13 to a predetermined position in the longitudinal direction of the cathode foil 4.

  At this time, like the electrolytic capacitor described above, the first anode lead tab terminal 11 is separated from the one end side of the anode foil 3 by a predetermined distance (first distance) and wound in a predetermined first circumferential direction. It is connected to the part of the anode foil 3 that is to be placed in position. Further, the second anode lead tab terminal 12 is separated from the one end side of the anode foil by a distance longer than a predetermined distance (second distance), and in a wound state, the second anode lead tab terminal 12 has a predetermined second with respect to the first circumferential direction position. It is connected to the part of the anode foil 3 that is to be arranged in the circumferential position.

  The distance PL between the first anode lead tab terminal 11 and the second anode lead tab terminal 12 corresponds to the portion of the anode foil 3 corresponding to the first circumferential position and the second circumferential position relative to the first circumferential position. The portion of the anode foil 3 closest to the winding is wound, and further, the distance from the portion of the anode foil 3 corresponding to the second circumferential direction position after winding the anode foil 3 for another round is set.

  Further, the cathode lead tab terminal 13 is separated from the one end side of the cathode foil 4 by a predetermined distance (third distance), and in a wound state, the cathode lead tab terminal 13 has a predetermined distance with respect to the first circumferential position and the second circumferential position. It is connected to the portion of the cathode foil 4 to be arranged at the third circumferential position.

  Next, similarly to the method shown in FIG. 4 described above, the one end side of the disposed anode foil 3, cathode foil 4 and separator paper 5, 6 is sandwiched between the core 31 a and the core 31 b. Next, in this state, the cores 31a and 31b are rotated clockwise (clockwise), whereby the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 become positive (negative) foil 3. , 4, the anode foil 3, the cathode foil 4, and the like are wound from one end side to form the capacitor element 2. Next, a chemical conversion treatment or the like is performed on the capacitor element, and thereafter, as in the steps shown in FIGS. After that, the electrolytic capacitor is completed.

  In the electrolytic capacitor described above, by applying the one-side press terminal 18 as the first anode lead tab terminal 11, the radial position of the lead wire 18c is shifted outward, and the second anode lead tab terminal 12 (both side press terminals 16). ) In the radial direction of the lead wire 16c.

  This will be described. First, as a comparative example, when a double-side press terminal is applied as the first anode lead tab terminal and a double-side press terminal is applied as the second anode lead tab terminal, as shown in FIG. 13, the second anode lead tab terminal 112 (lead wire) 116c) is arranged in a predetermined second circumferential position with respect to the first circumferential position where the first anode lead tab terminal 111 (lead wire 116c) is arranged in the circumferential direction, but positive ( 2) The second anode lead tab terminal 112 (lead wire 116c) is disposed outside the radial position of the first anode lead tab terminal 111 (lead wire 116c) by the amount of winding of the electrode foils 3, 4 etc. It will be.

  On the other hand, in the above-described electrolytic capacitor, as shown in the upper part of FIG. 14, the one-side press terminal 18 is applied as the first anode lead tab terminal 11, and the second connection surface 18e of the connection portion 18b is the anode. The one-side press terminal 18 is connected to the anode foil 3 in a manner in contact with the inner peripheral surface 3 a of the foil 3. For this reason, although the radial position of the connecting portion 18b is not different from the radial position of the connecting portion 116b when the both-side press terminal 116 is applied, the radial position of the lead wire 18c (boss portion 18a) is as shown in FIG. The distance S is shifted to the side (outside) opposite to the center C side of the capacitor element 2 from the radial position of the lead wire 116c (boss portion 116a) when the both-side press terminals 116 shown in the lower stage are applied. It will be.

  As a result, as shown in FIG. 13, the radial position of the lead wire 18 c (boss portion 18 a) of the one-side press terminal 18 as the first anode lead tab terminal 11 is shifted outward, and both sides as the second anode lead tab terminal 12 are The lead wires 16c and 18c of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 are aligned with the radial position of the lead wire 16c (boss portion 16a) of the press terminal 16 at the apex of the equilateral triangle. It can be arranged at a corresponding position.

  As a result, the pitch between each of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 is substantially constant, the ESL is reduced, and the characteristic of the electrolytic capacitor is prevented from being deteriorated. it can. Further, the lead wires and bosses of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 are easily inserted into the opening 22a of the sealing rubber packing 22 and the opening 24a of the seat plate 24. And productivity can be improved.

(Embodiment 3)
Here, an electrolytic capacitor in which a one-side press terminal is applied as the first anode lead tab terminal and a one-side press terminal is applied as the second anode lead tab terminal will be described.

  First, as shown in FIG. 15, the one-side press terminal 18 is connected as the first anode lead tab terminal 11 and the one-side press terminal 18 is connected as the second anode lead tab terminal 12 at a predetermined position in the longitudinal direction of the anode foil 3. . Further, the both-side press terminal 16 is connected as a cathode lead tab terminal 13 to a predetermined position in the longitudinal direction of the cathode foil 4.

  At this time, like the electrolytic capacitor described above, the first anode lead tab terminal 11 is separated from the one end side of the anode foil 3 by a predetermined distance (first distance) and wound in a predetermined first circumferential direction. It is connected to the part of the anode foil 3 that is to be placed in position. Further, the second anode lead tab terminal 12 is separated from the one end side of the anode foil by a distance longer than a predetermined distance (second distance), and in a wound state, the second anode lead tab terminal 12 has a predetermined second with respect to the first circumferential direction position. It is connected to the part of the anode foil 3 that is to be arranged in the circumferential position.

  The distance PL between the first anode lead tab terminal 11 and the second anode lead tab terminal 12 corresponds to the portion of the anode foil 3 corresponding to the first circumferential position and the second circumferential position relative to the first circumferential position. The portion of the anode foil 3 closest to the winding is wound, and further, the distance from the portion of the anode foil 3 corresponding to the second circumferential direction position after winding the anode foil 3 for another round is set.

  Further, the cathode lead tab terminal 13 is separated from the one end side of the cathode foil 4 by a predetermined distance (third distance), and in a wound state, the cathode lead tab terminal 13 has a predetermined distance with respect to the first circumferential position and the second circumferential position. It is connected to the portion of the cathode foil 4 to be arranged at the third circumferential position.

  Next, similarly to the method shown in FIG. 4 described above, the one end side of the disposed anode foil 3, cathode foil 4 and separator paper 5, 6 is sandwiched between the core 31 a and the core 31 b. Next, in this state, the cores 31a and 31b are rotated clockwise (clockwise), whereby the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 become positive (negative) foil 3. , 4, the anode foil 3, the cathode foil 4, and the like are wound from one end side to form the capacitor element 2. Next, a chemical conversion treatment or the like is performed on the capacitor element, and thereafter, as in the steps shown in FIGS. 6 to 9, attachment of a rubber packing for sealing, accommodation and processing in an aluminum case, attachment of a seat plate, etc. After that, the electrolytic capacitor is completed.

  In the electrolytic capacitor described above, the one-side press terminal 18 is applied as the first anode lead tab terminal 11, thereby shifting the radial position of the lead wire 18 c to the outside and the second anode lead tab terminal 12 as the one-side press terminal. 18, the radial position of the lead wire 18c is shifted inward, the radial position of the lead wire 18c of the first anode lead tab terminal 11, and the diameter of the lead wire 18c of the second anode lead tab terminal 12. The direction position can be matched.

  This will be described. First, as a comparative example, when both-side press terminals are applied as the first anode lead tab terminal and the second anode lead tab terminal, as shown in FIG. 16, the second anode lead tab terminal 112 (lead wire 116c) In the radial direction, the positive (negative) polar foils 3 and 4 are arranged at a predetermined second circumferential position with respect to the first circumferential position where the first anode lead tab terminal 111 (lead wire 116c) is arranged. Thus, the second anode lead tab terminal 112 (lead wire 116c) is disposed outside the radial position of the first anode lead tab terminal 111 (lead wire 116c).

  On the other hand, in the above-described electrolytic capacitor, as shown in the upper part of FIG. 17, the one-side press terminal 18 is applied as the first anode lead tab terminal 11, and the second connection surface 18e of the connection portion 18b is the anode. The one-side press terminal 18 is connected to the positive (negative) electrode foil 3 so as to be in contact with the inner peripheral surface 3 a of the foil 3. Therefore, although the radial position of the connecting portion 18b is not different from the radial position of the connecting portion 116b when the both-side press terminals 116 are applied, the radial position of the lead wire 18c (boss portion 18a) is as shown in FIG. The distance S is shifted to the side (outside) opposite to the center C side of the capacitor element 2 from the radial position of the lead wire 116c (boss portion 116a) when the both-side press terminals 116 shown in the lower stage are applied. It will be.

  Further, the one-side press terminal 18 is applied as the second anode lead tab terminal 12, and the one-side press terminal 18 is an anode in such a manner that the first connection surface 18 d of the connecting portion 18 b contacts the inner peripheral surface 3 a of the anode foil 3. Connected to the foil 3. Therefore, although the radial position of the connecting portion 18b is not different from the radial position of the connecting portion 116b when the both-side press terminals 116 are applied, the radial position of the lead wire 18c (boss portion 18a) is as shown in FIG. Distance from the radial position of the lead wire 116c (boss portion 116a) when the both-side press terminals 116 shown in the lower stage are applied to the center (start of winding of the anode foil 3 and the like) C side (inside) of the capacitor element 2 Shift by S.

  As a result, as shown in FIG. 16, the radial position of the lead wire 18 c (boss portion 18 a) of the one-side press terminal 18 serving as the first anode lead tab terminal 11 is shifted outward, and the second anode lead tab terminal 12 serves as the second anode lead tab terminal 12. The radial position of the lead wire 18c (boss portion 18a) of the one-side press terminal 18 is shifted inward. For this reason, the radial position of the lead wire 18c (boss portion 18a) of the one-side press terminal 18 as the first anode lead tab terminal 11, and the lead wire 18c (boss portion 18a) of the one-side press terminal 18 as the second anode lead tab terminal 12. And the lead wires 16c and 18c of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 can be arranged at positions corresponding to the vertices of the equilateral triangle. .

  As a result, the pitch between each of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 is substantially constant, the ESL is reduced, and the characteristic of the electrolytic capacitor is prevented from being deteriorated. it can. Further, the lead wires and bosses of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 are easily inserted into the opening 22a of the sealing rubber packing 22 and the opening 24a of the seat plate 24. And productivity can be improved.

(Modification)
As the electrolytic capacitor of each of the embodiments described above, the connection portion of the positive (negative) lead tab terminal is located on the inner peripheral surface of the positive (negative) electrode foil in a state where the positive (negative) electrode foil is wound The electrolytic capacitor has been described as an example. The arrangement of the positive (negative) electrode lead tab terminal and the positive (negative) electrode foil is not limited to this, and the connection portion of the positive (negative) electrode lead tab terminal is in a state where the positive (negative) electrode foil is wound. An electrolytic capacitor located on the outer peripheral surface of the positive (negative) foil may be used.

  First, a description will be given of an electrolytic capacitor in which both-side press terminals are applied as first anode lead tab terminals and one-side press terminals are applied as second anode lead tab terminals. In this case, as shown in the upper part of FIG. 18, the connecting portion 18 b of the one-side press terminal 18 as the second anode lead tab terminal 12 has its second connecting surface 18 e connected to the outer peripheral surface 3 b of the anode foil 3. It will be.

  Therefore, although the radial position of the connecting portion 18b is not different from the radial position of the connecting portion 116b when the both-side press terminals 116 are applied, the radial position of the lead wire 18c (boss portion 18a) is as shown in FIG. When the both-side press terminal 116 shown in the lower stage is applied, the lead wire 116c (boss portion 116a) is shifted inward by a distance S from the radial position.

  As a result, the radial position of the lead wire 18 c (boss portion 18 a) of the one-side press terminal 18 as the second anode lead tab terminal 12 is shifted inward, and the lead wire 16 c of the both-side press terminal 16 as the first anode lead tab terminal 11. The lead wires 16c and 18c of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 are arranged at positions corresponding to the vertices of the equilateral triangle in accordance with the radial position of the (boss portion 16a). (See FIG. 10).

  Next, an electrolytic capacitor in which a one-side press terminal is applied as the first anode lead tab terminal and a both-side press terminal is applied as the second anode lead tab terminal will be described. In this case, as shown in the upper part of FIG. 19, the connection portion 18 b of the one-side press terminal 18 as the first anode lead tab terminal 11 has its first connection surface 18 d connected to the outer peripheral surface 3 b of the anode foil 3. It will be.

  For this reason, although the radial position of the connecting portion 18b is not different from the radial position of the connecting portion 116b when the both-side press terminals 116 are applied, the radial position of the lead wire 18c (boss portion 18a) is shown in FIG. When the both-side press terminal 116 shown in the lower stage is applied, the lead wire 116c (boss portion 116a) is shifted outward by the distance S from the radial position.

  As a result, the radial position of the lead wire 18 c (boss portion 18 a) of the one-side press terminal 18 as the first anode lead tab terminal 11 is shifted outward, and the lead wire 16 c of the both-side press terminal 16 as the second anode lead tab terminal 12. The lead wires 16c and 18c of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 are arranged at positions corresponding to the vertices of the equilateral triangle in accordance with the radial position of the (boss portion 16a). (See FIG. 13).

  Next, an electrolytic capacitor in which a one-side press terminal is applied as the first anode lead tab terminal and a one-side press terminal is applied as the second anode lead tab terminal will be described. In this case, as shown in the upper part of FIG. 20, the connection portion 18 b of the one-side press terminal 18 as the first anode lead tab terminal 11 has its first connection surface 18 d connected to the outer peripheral surface 3 b of the anode foil 3. It will be.

  Therefore, although the radial position of the connecting portion 18b is not different from the radial position of the connecting portion 116b when the both-side press terminals 116 are applied, the radial position of the lead wire 18c (boss portion 18a) is as shown in FIG. When the both-side press terminal 116 shown in the lower stage is applied, the lead wire 116c (boss portion 116a) is shifted outward by the distance S from the radial position.

  Further, as shown in the upper part of FIG. 20, the connection portion 18 b of the one-side press terminal 18 as the second anode lead tab terminal 12 has its second connection surface 18 e connected to the outer peripheral surface 3 b of the anode foil 3. .

  Therefore, although the radial position of the connecting portion 18b is not different from the radial position of the connecting portion 116b when the both-side press terminals 116 are applied, the radial position of the lead wire 18c (boss portion 18a) is as shown in FIG. When the both-side press terminal 116 shown in the lower stage is applied, the lead wire 116c (boss portion 116a) is shifted inward by a distance S from the radial position.

  As a result, as shown in FIG. 20, the radial position of the lead wire 18 c (boss portion 18 a) of the one-side press terminal 18 as the first anode lead tab terminal 11 is shifted outward, and the second anode lead tab terminal 12 is The radial position of the lead wire 18c (boss portion 18a) of the one-side press terminal 18 is shifted inward. For this reason, the radial position of the lead wire 18c (boss portion 18a) of the one-side press terminal 18 as the first anode lead tab terminal 11, and the lead wire 18c (boss portion 18a) of the one-side press terminal 18 as the second anode lead tab terminal 12. And the lead wires 16c and 18c of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 can be arranged at positions corresponding to the vertices of the equilateral triangle. (See FIG. 16).

  As a result, the pitch between the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 is substantially constant even in the electrolytic capacitor in which the connection portion of the anode lead tab terminal is located on the outer peripheral surface of the anode foil. Thus, it is possible to suppress the ESL from being reduced and the characteristics as an electrolytic capacitor from being deteriorated. Further, the lead wires and bosses of the first and second anode lead tab terminals 11 and 12 and the cathode lead tab terminal 13 are easily inserted into the opening 22a of the sealing rubber packing 22 and the opening 24a of the seat plate 24. And productivity can be improved.

  In each of the above-described embodiments, as the connection mode of the first anode lead tab terminal 11 and the second anode lead tab terminal 12 to the anode foil 3, the distance PL (1) between the first anode lead tab terminal 11 and the second anode lead tab terminal 12 ( NL) winds up the portion of the anode foil 3 corresponding to the first circumferential position in the anode foil 3 and the portion of the anode foil 3 closest to the second circumferential position relative to the first circumferential position, Furthermore, the case where it set to the space | interval with the part of the anode foil 3 corresponding to the 2nd circumferential direction position after winding the anode foil 3 one more time was demonstrated as an example.

  The connection mode of the first anode lead tab terminal 11 and the second anode lead tab terminal 12 to the anode foil 3 is not limited to this. For example, from the portion of the anode foil 3 to which the first anode lead tab terminal 11 is connected, The second anode lead tab terminal 12 may be connected to a predetermined portion of the anode foil 3 after winding up a length less than one round. Further, the second anode lead tab terminal 12 may be connected to a predetermined portion of the anode foil 3 after being wound over more than one turn from the portion of the anode foil 3 to which the first anode lead tab terminal 11 is connected. .

  In each of the above-described embodiments, the case where the both-side press terminal 16 is applied as the cathode lead tab terminal 13 has been described as an example. However, the one-side press terminal 18 may be applied as the cathode lead tab terminal 13.

  Even in such a case, the both-side press terminal 16 is applied as the first anode lead tab terminal 11, and the one-side press terminal 18 is applied as the second anode lead tab terminal 12, and radially outward with respect to the first anode lead tab terminal 11. By connecting the second anode lead tab terminal 12 to be arranged to the anode foil 3 in such a manner that the lead wire 18c is shifted radially inward, the radial position of the lead wire 18c of the second anode lead tab terminal 12 Can be matched with the radial position of the lead wire 16c of the first anode lead tab terminal 11. As a result, alignment at the time of manufacture becomes easier, and characteristics as an electrolytic capacitor can be maintained.

  Further, the one-side press terminal 18 is applied as the first anode lead tab terminal 11, and the both-side press terminals 16 are applied as the second anode lead tab terminal 12, and they are disposed radially inward with respect to the second anode lead tab terminal 12. By connecting the first anode lead tab terminal 11 to the anode foil 3 in such a manner that the lead wire 18c shifts radially outward, the radial position of the lead wire 18c of the first anode lead tab terminal 11 is changed to the second. It can be matched with the radial position of the lead wire 16c of the anode lead tab terminal 12. As a result, alignment at the time of manufacture becomes easier, and characteristics as an electrolytic capacitor can be maintained.

  Moreover, the one side press terminal 18 is applied as the 1st anode lead tab terminal 11 and the 2nd anode lead tab terminal 12, and the 2nd anode lead tab terminal 12 which will be arrange | positioned radially outside with respect to the 1st anode lead tab terminal 11 is used. The lead wire 18c is connected to the anode foil 3 in such a manner that the lead wire 18c shifts radially inward, and the first anode lead tab terminal 11 to be disposed radially inward with respect to the second anode lead tab terminal 12 is The lead wire 18c is connected to the anode foil 3 in such a manner as to shift outward in the radial direction. For this reason, the radial position of the lead wire 18c of the second anode lead tab terminal 12 and the radial position of the lead wire 18c of the first anode lead tab terminal 11 can be matched to each other. As a result, alignment at the time of manufacture becomes easier, and characteristics as an electrolytic capacitor can be maintained.

  Furthermore, the electrolytic capacitor in each of the above-described embodiments includes the both-side press terminal 16 and the one-side press terminal 18, or the one-side press in which the anode foil 3 or the cathode foil 4 is connected to the first connection surface 18d. The terminal 18 and the one-side lead terminal 18 to which the anode foil 3 or the cathode foil 4 is connected to the second connection surface 18e are included. Thereby, since the radial direction position of the lead wire of each lead tab terminal can be matched, the positioning at the time of manufacture becomes easy. Therefore, a three-terminal electrolytic capacitor having two anode lead tab terminals and one cathode lead tab terminal can be realized. As a result, the size can be reduced compared to a four-terminal electrolytic capacitor having two anode lead tab terminals and two cathode lead tab terminals. In particular, when the shape (diameter) of a four-terminal capacitor is reduced, it is difficult to take out four positive (negative) electrode lead tab terminals, and the present invention is advantageous.

  The inventor applied the both-side press terminal as the first anode lead tab terminal as the first anode and the electrolytic capacitor (the first embodiment) to which the one-side press terminal was applied as the second anode lead tab terminal. An electrolytic capacitor in which a one-side press terminal is applied as a first anode lead tab terminal and a both-side press terminal is applied as a second anode lead tab terminal (Embodiment 2), and a one-side press terminal is applied as a first anode lead tab terminal as Example 3. Then, 500 electrolytic capacitors (Embodiment 3) each using a one-side press terminal as the second anode lead tab terminal were produced, and the positions of the four positive (negative) electrode lead tab terminals (lead wires) after completion ( Evaluation was made on the arrangement shape.

  In addition, the specific manufacturing method of the electrolytic capacitor is as described in the first to third embodiments, and the diameter is set to 6.3 mm. Further, as Comparative Example 1, as a first and second anode lead tab terminal, a three-terminal electrolytic capacitor to which both-side press terminals are applied, and as Comparative Example 2, as first and second positive (negative) electrode lead tab terminals. In each case, 500 four-terminal electrolytic capacitors to which both-side press terminals were applied were produced, and the shape and position of each positive (negative) electrode lead tab terminal (lead wire) were evaluated.

  As a criterion for determining whether the product is a non-defective product or a defective product, the angle of one vertex of a triangle formed by connecting the points where the lead wires of the three positive (negative) electrode lead tab terminals are located is measured. A sample within the range of ˜140 ° was regarded as a non-defective product, and a sample outside the range was regarded as a defective product. These results are shown in Table 1.

  As shown in Table 1, in the electrolytic capacitors according to Comparative Example 1 and Comparative Example 2 in which both side press terminals were applied, it was determined that all the shapes of the 500 samples evaluated were defective. For this reason, it was very difficult to manufacture the capacitor element itself, winding was poor, and the lead position could not be evaluated. On the other hand, in the electrolytic capacitors of Examples 1 to 3 according to the respective Embodiments 1 to 3, all of the 500 samples evaluated were determined to be non-defective products. From the evaluation results, it was proved that the above-described electrolytic capacitor can contribute to the reduction of ESL, and can be easily aligned with a sealing rubber packing, a seat plate, and the like, thereby improving productivity.

  The embodiments and examples disclosed this time are illustrative and not restrictive. The present invention is defined by the terms of the claims, rather than the scope described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Electrolytic capacitor, 2 Capacitor element, 3 Anode foil, 3a Inner peripheral surface, 3b Outer peripheral surface, 4 Cathode foil, 4a Inner peripheral surface, 4b Outer peripheral surface, 5 Separator paper, 6 Separator paper, 11 1st anode lead tab terminal, 12 2nd anode lead tab terminal, 13 cathode lead tab terminal, 16 both-side press terminal, 16a boss part, 16b connection part, 16c lead wire, 18 one side press terminal, 18a boss part, 18b connection part, 18c lead wire, 18d first connection surface 18e 2nd connection surface, 20 aluminum case, 22 rubber packing for sealing, 22a opening part, 24 seat plate, 24a opening part, 31a, 31b winding core, 51, 52 arrow.

Claims (8)

Electrolytic capacitors each wound with a strip-like anode foil and cathode foil,
An anode foil and a cathode foil wound in a predetermined direction while facing each other from one end side in the longitudinal direction;
A first anode lead tab terminal connected to the portion of the anode foil spaced a first distance from the one end side of the anode foil and disposed at a predetermined first circumferential position in a wound state; ,
The anode foil is connected to a portion of the anode foil separated from the one end side of the anode foil by a second distance longer than the distance of the first distance, and is wound up to a predetermined position with respect to the first circumferential position. A second anode lead tab terminal to be disposed at a second circumferential position;
The cathode foil is connected to a portion of the cathode foil that is separated from the one end side by a third distance, and is wound up in a predetermined third direction with respect to the first circumferential position and the second circumferential position. One cathode lead tab terminal to be disposed at a circumferential position;
With
Each of the first anode lead tab terminal and the second anode lead tab terminal is
An anode connecting portion connected in a manner to contact the anode foil;
An anode lead wire that is electrically connected to the anode connection portion and serves as an anode terminal;
The cathode lead tab terminal is
A cathode connection portion connected in a manner to contact the cathode foil;
A cathode lead wire that is electrically connected to the cathode connection portion and serves as a cathode terminal;
The second anode lead tab terminal corresponds to the anode foil corresponding to the second circumferential position after winding the anode foil by a predetermined length from a portion of the anode foil corresponding to the first circumferential position. Connected to the part of
At least one anode lead tab terminal of the first anode lead tab terminal and the second anode lead tab terminal is in a state where the anode foil is wound, and a radial position of the anode lead wire is a radial direction of the anode connecting portion. An electrolytic capacitor of the first type formed so as to be different from the position. The anode lead tab terminal of the first anode lead tab terminal is formed so that the radial position of the anode lead wire is the same as the radial position of the anode connecting portion in a state where the anode foil is wound. The second type,
The second anode lead tab terminal is the first type,
The second anode lead tab terminal is configured such that the radial position of the anode lead wire of the second anode lead tab terminal is shifted inward to match the radial position of the anode lead wire of the first anode lead tab terminal. The electrolytic capacitor of claim 1 connected to an anode foil. The first anode lead tab terminal is the first type,
The anode lead tab terminal of the second anode lead tab terminal is formed such that the radial position of the anode lead wire is the same as the radial position of the anode connecting portion in a state where the anode foil is wound. The second type,
The first anode lead tab terminal is configured such that the radial position of the anode lead wire of the first anode lead tab terminal is shifted outward to match the radial position of the anode lead wire of the second anode lead tab terminal. The electrolytic capacitor of claim 1 connected to an anode foil. The first and second anode lead tab terminals are of the first type,
The first anode lead tab terminal is configured such that the radial position of the anode lead wire of the first anode lead tab terminal is shifted outward to match the radial position of the anode lead wire of the second anode lead tab terminal. Connected to the anode foil,
The second anode lead tab terminal is configured such that the radial position of the anode lead wire of the second anode lead tab terminal is shifted inward to match the radial position of the anode lead wire of the first anode lead tab terminal. The electrolytic capacitor of claim 1 connected to an anode foil.   The anode lead wire of the first anode lead tab terminal, the anode lead wire of the second anode lead tab terminal, and the cathode lead wire of the cathode lead tab terminal in a state where the anode foil and the cathode foil are wound up. The electrolytic capacitor according to claim 1, wherein the planar arrangement pattern is a pattern arranged at a vertex of a triangle.   The electrolytic capacitor according to claim 5, wherein an angle formed by one vertex of the triangle is 20 to 140 ° in the planar arrangement pattern. A belt-shaped anode foil and a cathode foil wound respectively;
A connecting portion connected in a manner to contact either the anode foil or the cathode foil, and three lead tab terminals each including a lead wire electrically connected to the connecting portion and serving as a terminal;
The three lead tab terminals include a lead tab terminal in which the lead wire is disposed at the same radial position as the connection portion in a state where the anode foil and the cathode foil are wound, and the lead wire is connected to the lead tab terminal. An electrolytic capacitor comprising: a lead tab terminal arranged in a position shifted in a radial direction with respect to the portion. A belt-shaped anode foil and a cathode foil wound respectively;
A connecting portion connected in a manner to contact either the anode foil or the cathode foil, and three lead tab terminals each including a lead wire electrically connected to the connecting portion and serving as a terminal;
The three lead tab terminals are such that the lead wire is arranged at a position where the lead wire is shifted outward in the radial direction with respect to the connecting portion in a state where the anode foil and the cathode foil are wound. And a lead tab terminal in a form in which the lead wire is disposed at a position in which a radial position is shifted inward with respect to the connection portion.

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