JP2006179943A - Solid-state electrolytic capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid-state electrolytic capacitor which can be simplified in structure and be reduced in ESL by solving the problem of a bad ESL characteristic which is due to a long lead-out distance from a capacitor element to a terminal. <P>SOLUTION: An anode portion and a cathode portion of the capacitor element 1 which uses a conductive polymer as a solid-state electrolyte are bonded on an anode terminal 10 and a cathode terminal 11, and all these components are coated with a coating resin 12 to fabricate the solid-state electrolytic capacitor. In the solid-state electrolytic capacitor, the anode terminal 10 and the cathode terminal 11 are formed flat and are so arranged that the bottom faces may be arranged on one and the same reference surface. The bottom face of the cathode terminal 11 is drawn near to the bottom face of the anode terminal 10 as close as the minimum distance of 1.0 mm. Thin portions 10a are formed in both end parts of the anode terminal 10 and a thin portion 11a is formed in an end part of the cathode terminal 11 which is on the opposite side from the anode terminal side. Due to this structure, the lead-out distance from the capacitor element 1 to the terminals can be shortened, which brings about a superior ESR characteristic and a low ESL. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a solid electrolytic capacitor using a conductive polymer used in various electronic devices as a solid electrolyte.

  Along with the higher frequency of electronic equipment, capacitors that are one of the electronic components have been required to have better impedance characteristics in the high frequency range than before. Various solid electrolytic capacitors using a polymer as a solid electrolyte have been studied.

  FIG. 13 is a cross-sectional view showing the configuration of this type of conventional solid electrolytic capacitor, FIG. 14 is a perspective view thereof, and FIG. 15 is a partially cutaway perspective view showing the configuration of a capacitor element used in the solid electrolytic capacitor. 13 to 15, reference numeral 30 denotes a capacitor element. The capacitor element 30 is formed by forming a dielectric oxide film layer on the surface of an anode body 31 made of an aluminum foil which is a valve metal, and then insulating resist portions. 32 is separated into an anode portion 33 and a cathode portion 34, and a solid electrolyte layer 35 and a cathode layer 36 made of carbon and silver paste are sequentially stacked on the surface of the cathode portion 34.

  37 is an anode comb terminal, 38 is a cathode comb terminal, 38a is a guide part formed by bending a part of the connection surface of the cathode comb terminal 38, and the anode part 33 of the capacitor element 30 is connected to the anode comb terminal. Similarly, the cathode portion 34 is mounted on the connection surface of the cathode comb terminal 38 on the connection surface 37, and the anode portion 33 of the capacitor element 30 is joined by resistance welding by bending the connection portion 37a of the connection surface of the anode comb terminal 37. The cathode portion 34 is connected to the connection surface of the cathode comb terminal 38 via a conductive silver paste (not shown).

  Reference numeral 39 denotes an insulating exterior resin that covers the capacitor element 30 in a state where parts of the anode comb terminal 37 and the cathode comb terminal 38 to which the capacitor element 30 is bonded are exposed on the outer surface. The anode comb terminal 37 and the cathode comb terminal 38 exposed from 39 are bent from the side surface to the bottom surface along the exterior resin 39 to form external terminals, thereby constituting a surface mount type solid electrolytic capacitor. Met.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2000-340463 A

  However, in the above-described conventional solid electrolytic capacitor, the shapes of the anode comb terminal 37 and the cathode comb terminal 38 connected to the anode portion 33 and the cathode portion 34 of the capacitor element 30 are not only a complicated and high cost factor. There is a problem that the ESL (equivalent series inductance) characteristic is poor because the distance from the connecting surface (the anode portion 33 and the cathode portion 34) of the anode comb terminal 37 and the cathode comb terminal 38 to the mounting surface is long. In recent years, there has been a strong demand for smaller and larger electrolytic capacitors used around CPUs in personal computers, and in addition to lowering ESR (equivalent series resistance) in response to higher frequencies, further eliminating noise. It had the problem that it was not able to be adopted in the situation where it was excellent in stability and transient response, and low ESL was required.

  An object of the present invention is to solve such a conventional problem and to provide a solid electrolytic capacitor capable of achieving low ESL by shortening a drawing distance from a capacitor element to a terminal. .

  In order to solve the above-mentioned problems, the present invention joins an anode part and a cathode part of a capacitor element using a conductive polymer as a solid electrolyte to the upper surfaces of an anode terminal and a cathode terminal, and a mounting surface of the anode terminal and the cathode terminal. In the solid electrolytic capacitor in which the capacitor element is integrally covered with an insulating exterior resin with the lower surface exposed, the anode terminal and the cathode terminal are formed in a flat plate shape, and the lower surface serving as the mounting surface is the same reference surface And the lower surface, which is the mounting surface of the cathode terminal, is brought close to the lower surface, which is the mounting surface of the anode terminal, to a minimum distance of 1.0 mm, and further, both ends of the anode terminal and the anode terminal side of the cathode terminal It is set as the structure which provided the thin part in the other side, respectively.

  As described above, according to the present invention, the anode terminal and the cathode terminal are configured in a flat plate shape, the lower surface serving as the mounting surface is disposed on the same reference surface, and the lower surface serving as the mounting surface of the cathode terminal is provided. Leads from the capacitor element to the terminal by a structure that is close to the bottom surface, which is the mounting surface of the anode terminal, to a minimum distance of 1.0 mm, and is further provided with thin portions on both ends of the anode terminal and on the opposite side to the anode terminal side of the cathode terminal. Since the distance can be shortened and the anode terminal and the cathode terminal can be made as close as possible, the ESR characteristic is excellent and the ESL can be reduced.

(Embodiment 1)
Hereinafter, the first aspect of the present invention will be described with reference to the first, seventh and eighth aspects of the present invention.

  1A to 1D are a plan sectional view, a front sectional view, a bottom sectional view, and a side sectional view showing a configuration of a solid electrolytic capacitor according to Embodiment 1 of the present invention. FIG. It is the partially cutaway perspective view which showed the structure of the capacitor | condenser element used for a capacitor | condenser.

  1 and 2, reference numeral 1 denotes a capacitor element. The capacitor element 1 has an insulating resist portion after a dielectric oxide film layer (not shown) is formed on the surface of an anode body 2 made of an aluminum foil which is a valve metal. 3 is separated into an anode part 4 and a cathode part 5, and a solid electrolyte layer 6 and a cathode layer 7 made of carbon and silver paste are sequentially laminated on the surface of the cathode part 5. .

  Reference numeral 8 denotes an anode lead frame. The anode part 4 is placed in a state where a plurality of the capacitor elements 1 (5 sheets in the present embodiment) are stacked on the anode lead frame 8, and the guide parts 8a at both ends are placed. The anode part 4 is wrapped and bent, and laser welding is performed at the joining part 8b to join together.

  Reference numeral 9 denotes a cathode lead frame. A plurality of the capacitor elements 1 are stacked on the cathode lead frame 9 and the cathode portion 5 is placed through a conductive adhesive (not shown). In this way, a plurality of capacitor elements 1 are laminated and integrated by the anode lead frame 8 and the cathode lead frame 9 as described below. This is called an element unit.

  Reference numeral 10 denotes an anode terminal, and the anode terminal 10 is formed in a reverse convex shape in which the thickness at both ends is reduced and the thin portion 10a is integrally provided. On the anode terminal 10, the anode lead of the capacitor element unit is formed. The frame 8 is placed and joined by performing laser welding at the joining portions 10b in the thin portions 10a at both ends.

  Reference numeral 11 denotes a cathode terminal. The cathode terminal 11 is arranged such that the lower surface is disposed on the same surface as the lower surface of the anode terminal 10 (the surface to be mounted on the substrate), and the lower surface of the cathode terminal 11 is The configuration is as close as possible to the lower surface of the anode terminal 10 (1.0 mm or more is necessary because there is a possibility of leakage if the distance between both is less than 1.0 mm). In addition, a thin portion 11a having a thin thickness is integrally provided on the opposite side of the cathode terminal 11 to the anode terminal 10 side, and the thin portion 11a does not serve as a mounting surface on the substrate. It is covered with an exterior resin 12 described later. The cathode lead frame 9 of the capacitor element unit is placed on the thus configured cathode terminal 11 and joined by laser welding at the joining portions 11b in the thin portions 11a at both ends.

  Reference numeral 12 denotes an insulating exterior resin in which the capacitor element unit is integrally covered with the lower surfaces serving as the mounting surfaces of the anode terminal 10 and the cathode terminal 11 being exposed. In this embodiment, an epoxy resin is used. It is.

  3A and 3B are a plan view showing the anode terminal 10 and the cathode terminal 11 and a cross-sectional view taken along the line AA, in which 13 is a hoop-like base material made of a copper alloy. , 13a are feed holes for intermittently conveying the base material 13; Reference numerals 10 and 11 denote an anode terminal and a cathode terminal, and a plurality of the terminals are continuously provided on the hoop-like base material 13 at a predetermined interval. A capacitor element unit is mounted on the anode terminal 10 and the cathode terminal 11. Are joined together with the exterior resin 12 and then separated from the base material 13 into individual pieces.

  In addition, the anode terminal 10 and the cathode terminal 11, which are integrally formed on the base material 13 in this way, are configured by etching a single plate-like base material 13. The unnecessary portions are removed, and the thin portions 10a and 11a are formed at the same time on the anode terminal 10 and the cathode terminal 11, and the thin portions 10a and 11a and the lower surface that is the mounting surface on the substrate are formed. The step is ensured to be 80 μm or more.

  Note that the step between the thin portion and the lower surface serving as the mounting surface on the substrate is 80 μm on the basis of the dimension required for the exterior resin 12 covering the capacitor element unit to sufficiently flow into and cover the step portion. That's it.

  The solid electrolytic capacitor according to the present embodiment configured as described above is drawn out by taking out the anode part 4 and the cathode part 5 of the capacitor element 1 from the flat anode terminal 10 and the cathode terminal 11. Since the distance can be shortened and the lower surface of the cathode terminal 11 is as close as possible to the lower surface of the anode terminal 10 and the path between the anode terminal and the cathode terminal is made the shortest distance, the ESR characteristic is improved. Excellent and low ESL can be realized. In particular, regarding the ESL characteristics, the solid electrolytic capacitor according to the present embodiment is as low as 800 pH, and the result is substantially halved compared to 1500 pH of the conventional product. Obtained.

  The anode terminal 10 and the cathode terminal 11 are provided with thin portions 10a and 11a having a reduced thickness, and the anode lead frame 8 and the cathode lead frame 9 of the capacitor element unit are laser-welded in the thin portions 10a and 11a, respectively. With the configuration of joining by welding, not only the appearance becomes beautiful because the welding traces due to joining are covered with the exterior resin 12, but also there is a risk that the welding traces may cause floating during mounting and cause mounting defects. There will be no, and it will be able to contribute greatly to the improvement of reliability.

  In the present embodiment, a plurality of capacitor elements 1 are stacked and joined to the anode lead frame 8 and the cathode lead frame 9 to form a capacitor element unit. The capacitor element unit is connected to the anode terminal 10 and the cathode. Although an example in which a solid electrolytic capacitor is configured by bonding to each of the terminals 11 has been described, the present invention is not limited to this, and one sheet without using the anode lead frame 8 and the cathode lead frame 9. Alternatively, a plurality of capacitor elements 1 can be directly laminated and joined to the anode terminal 10 and the cathode terminal 11, respectively, and this makes it possible to further reduce the ESL. The number of stacked capacitor elements 1 may be determined appropriately according to the purpose.

  Further, in the present embodiment, the anode body 2 constituting the capacitor element 1 has been described by taking an example of a structure made of an aluminum foil. However, the present invention is not limited to this, and the tantalum, niobium foil, or fired body A combination or a combination of these materials may also be used.

  Moreover, although the base material 13 which comprises the anode terminal 10 and the cathode terminal 11 was demonstrated with the hoop-shaped thing which consists of a copper alloy, a material and a shape are not limited to this similarly.

  Moreover, although the thin part 10a and 11a provided in the anode terminal 10 and the cathode terminal 11 demonstrated by the method of forming by an etching, this is not limited to this similarly, It is set as the method of forming a thin part by press molding. May be.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment.

  In the present embodiment, the shape of the cathode terminal of the solid electrolytic capacitor according to the first embodiment is partially different, and the other configuration is the same as that of the first embodiment. Detailed description thereof will be omitted, and only different parts will be described below with reference to the drawings.

  4A to 4D are a plan sectional view, a front sectional view, a bottom sectional view, and a side sectional view showing the structure of the solid electrolytic capacitor according to the second embodiment of the present invention. In FIG. Reference numeral 14 denotes a cathode terminal.

  The cathode terminal 14 is arranged on the same surface as the lower surface of the anode terminal 10 (the surface to be mounted on the substrate), and the lower surface of the cathode terminal 14 can be the lower surface of the anode terminal 10. As close as possible (because there is a high possibility of leakage when the distance between both is less than 1.0 mm, 1.0 mm or more is necessary), and the thinned portion with the thickness reduced on the side opposite to the anode terminal 10 side of the cathode terminal 14 14a is provided in the same manner as the cathode terminal 11 of the solid electrolytic capacitor according to the first embodiment, but the lower surface is mounted at a substantially central portion opposite to the anode terminal 10 of the thin portion 14a. In this configuration, a mounting portion 14b is provided.

  The solid electrolytic capacitor according to the present embodiment configured as described above has a configuration in which a mounting portion 14b having a lower surface as a mounting surface is provided at a substantially central portion opposite to the anode terminal 10 of the thin portion 14a of the cathode terminal 14. As a result, the mounting surface on the substrate increases, so that the stability during mounting can be greatly improved.

  In addition, the solid electrolytic capacitor according to the present embodiment configured as described above is excellent in ESR characteristics and can realize low ESL, similarly to the solid electrolytic capacitor according to the first embodiment. In particular, regarding the ESL characteristics, the solid electrolytic capacitor according to the present embodiment was as low as 800 pH, and the result was substantially halved compared to 1500 pH of the conventional product.

(Embodiment 3)
The third embodiment of the present invention will be described below in particular.

  In the present embodiment, the shape of the cathode terminal of the solid electrolytic capacitor according to the first embodiment is partially different, and the other configuration is the same as that of the first embodiment. Detailed description thereof will be omitted, and only different parts will be described below with reference to the drawings.

  5A to 5D are a plan sectional view, a front sectional view, a bottom sectional view, and a side sectional view showing the configuration of the solid electrolytic capacitor according to Embodiment 3 of the present invention. In FIG. A terminal 15 is a cathode terminal.

  The cathode terminal 15 is arranged on the same surface as the lower surface of the anode terminal 10 (the surface to be mounted on the substrate), and the lower surface of the cathode terminal 15 is as close to the lower surface of the anode terminal 10 as possible. Although it is the same as that in the first embodiment, the cathode terminal 15 is configured to be close to each other (there is a possibility that leakage occurs when the distance between both is less than 1.0 mm, so 1.0 mm or more is necessary). A configuration in which the lower surface is extended to the end opposite to the anode terminal 10 and the thin portions 15a are provided at both ends of the cathode terminal 15 in the direction intersecting the direction connecting the anode terminal 10 and the cathode terminal 15, that is, The mounting surface of the mounting portion 14b provided on the cathode terminal 14 of Embodiment 2 and the mounting surface of the cathode terminal 14 are connected to each other, whereby the lower surface serving as the mounting surface of the cathode terminal 15 according to the present embodiment is substantially omitted. T-shaped .

  In the solid electrolytic capacitor according to the present embodiment configured as described above, in addition to the effects obtained by the solid electrolytic capacitor according to the first embodiment, the cathode terminal 15 can be easily manufactured and stable when mounted on a substrate. A special effect of improving the performance can be obtained.

  In addition, the solid electrolytic capacitor according to the present embodiment configured as described above has excellent ESR characteristics and can achieve low ESL, similar to the solid electrolytic capacitor according to the first and second embodiments. In particular, regarding the ESL characteristics, the solid electrolytic capacitor according to the present embodiment was as low as 800 pH, and the result was substantially halved compared to 1500 pH of the conventional product.

(Embodiment 4)
The fourth embodiment of the present invention will be described below with reference to the fourth embodiment.

  In the present embodiment, the shapes of the anode terminal and the cathode terminal of the solid electrolytic capacitor according to the first embodiment are partially different, and the other configuration is the same as that of the first embodiment. The same reference numerals are given to them, and detailed description thereof is omitted, and only different portions will be described below with reference to the drawings.

  6A to 6D are a plan sectional view, a front sectional view, a bottom sectional view, and a side sectional view showing the structure of a solid electrolytic capacitor according to Embodiment 4 of the present invention. In FIG. A terminal 17 is a cathode terminal.

  The anode terminal 16 is formed in a reverse convex shape having a thin wall portion 16a by reducing the thickness at both ends, similar to the anode terminal 10 according to the first embodiment. By extending the portion to be the mounting surface outward, the anode terminal protruding portion 16b protruding from the exterior resin 12 is provided as viewed from above.

  Similarly, the cathode terminal 17 has a configuration in which a cathode terminal projecting portion 17b projecting from the exterior resin 12 is provided by extending a portion of the lower surface of the cathode terminal 17 which is a mounting surface outward. It is a thing.

  The solid electrolytic capacitor according to the present embodiment configured as described above has a configuration in which the anode terminal protruding portion 16b and the cathode terminal protruding portion 17b are provided, so that when soldering for board mounting is performed, Since the fillet can be easily confirmed from the upper surface, the reliability of soldering can be greatly improved.

(Embodiment 5)
Hereinafter, the invention according to the fourth aspect of the present invention will be described with reference to the fifth embodiment.

  In this embodiment, the shapes of the anode terminal and the cathode terminal of the solid electrolytic capacitor according to the second embodiment are partially different, and the other configuration is the same as that of the second embodiment, and therefore the same part. The same reference numerals are given to them, and detailed description thereof is omitted, and only different portions will be described below with reference to the drawings.

  7A to 7D are a plan sectional view, a front sectional view, a bottom sectional view, and a side sectional view showing the structure of a solid electrolytic capacitor according to Embodiment 5 of the present invention. In FIG. A terminal 18 is a cathode terminal.

  The anode terminal 16 is formed in a reverse convex shape having a thin wall portion 16a by reducing the thickness at both ends, similar to the anode terminal 10 according to the second embodiment. By extending the portion to be the mounting surface outward, the anode terminal protruding portion 16b protruding from the exterior resin 12 is provided as viewed from above.

  Similarly, the cathode terminal 18 has a portion that becomes the mounting surface on the lower surface of the cathode terminal 18 and the mounting portion 18b extending outward, so that the cathode terminal protruding portion 18c that protrudes from the exterior resin 12 is seen from above. , 18d.

  The solid electrolytic capacitor according to the present embodiment configured as described above is provided with the anode terminal protruding portion 16b and the cathode terminal protruding portions 18c and 18d, so that when soldering for board mounting is performed. Since the solder fillet can be easily confirmed from the upper surface, the reliability of soldering can be greatly improved.

(Embodiment 6)
The sixth aspect of the present invention will be described below with reference to the sixth embodiment.

  In the present embodiment, the shapes of the anode terminal and the cathode terminal of the solid electrolytic capacitor according to the third embodiment are partially different from each other, and the other parts are the same as those of the third embodiment. The same reference numerals are given to them, and detailed description thereof is omitted, and only different portions will be described below with reference to the drawings.

  8A to 8D are a plan sectional view, a front sectional view, a bottom sectional view, and a side sectional view showing the structure of a solid electrolytic capacitor according to Embodiment 6 of the present invention. In FIG. A terminal 19 is a cathode terminal.

  The anode terminal 16 is formed in a reverse convex shape having a thin wall portion 16a by reducing the thickness at both ends, as in the anode terminal 10 according to the third embodiment. By extending the portion to be the mounting surface outward, the anode terminal protruding portion 16b protruding from the exterior resin 12 is provided as viewed from above.

  Similarly, the cathode terminal 19 is provided with cathode terminal projecting portions 19b and 19c projecting from the exterior resin 12 in a top view by extending the mounting surface portion of the lower surface of the cathode terminal 19 outward. It is a configuration.

  The thus configured solid electrolytic capacitor according to the present embodiment is provided with the anode terminal protruding portion 16b and the cathode terminal protruding portions 19b and 19c, so that when soldering for board mounting is performed. Since the solder fillet can be easily confirmed from the upper surface, the reliability of soldering can be greatly improved.

(Embodiment 7)
In the following, the invention described in claims 5 and 6 of the present invention will be described using the seventh embodiment.

  In the present embodiment, the anode terminal protruding portion and the cathode terminal protruding portion of the solid electrolytic capacitor according to Embodiment 4 are bent upward along the side surface of the exterior resin, and the other configuration is the embodiment. 4 are given the same reference numerals and the detailed description thereof is omitted, and only different parts will be described below with reference to the drawings.

  9A to 9D are a plan sectional view, a front sectional view, a bottom sectional view, and a side sectional view showing the structure of a solid electrolytic capacitor according to Embodiment 7 of the present invention. In FIG. Reference numeral 21 denotes a cathode terminal.

  The anode terminal 20 is formed in a reverse convex shape having a thin wall portion 20a by reducing the thickness at both ends, and by extending a portion of the lower surface of the anode terminal 20 that is a mounting surface outward, The anode terminal protruding portion 20b protruding from the exterior resin 12 is provided in the same manner as the anode terminal 16 according to the fourth embodiment. However, the solid electrolytic capacitor according to the present embodiment includes the anode terminal protruding portion 20b as the exterior. In this configuration, the resin 12 is bent upward along the side surface.

  Similarly, the cathode terminal 21 is provided with a cathode terminal protruding portion 21b by extending a portion of the lower surface of the cathode terminal 21 which is a mounting surface to the outside, and the cathode terminal protruding portion 21b extends along the side surface of the exterior resin 12. And bent upwards.

  The solid electrolytic capacitor according to the present embodiment configured as described above has a configuration in which the anode terminal projecting portion 20b and the cathode terminal projecting portion 21b are bent along the side surface of the exterior resin 12, so that the solder for board mounting is provided. When soldering is performed, the solder fillet is easily formed and the solder fillet can be easily confirmed from the upper surface, so that the reliability of soldering can be greatly improved. is there.

  Although not shown in the drawings, the exterior resin 12 is provided with a recess into which the anode terminal projection 20b and the cathode terminal projection 21b bent along the side surface of the exterior resin 12 are fitted. The size can be reduced without increasing the external dimension of the capacitor.

(Embodiment 8)
In the following, the invention described in claims 5 and 6 of the present invention will be described using the eighth embodiment.

  In the present embodiment, the anode terminal protruding portion and the cathode terminal protruding portion of the solid electrolytic capacitor according to Embodiment 5 are bent upward along the side surface of the exterior resin, and the other configuration is the embodiment. 4 are given the same reference numerals and the detailed description thereof is omitted, and only different parts will be described below with reference to the drawings.

  10 (a) to 10 (d) are a plan sectional view, a front sectional view, a bottom sectional view, and a side sectional view showing the structure of a solid electrolytic capacitor according to Embodiment 8 of the present invention. In FIG. A terminal 22 is a cathode terminal.

  The cathode terminal 20 is formed in a reverse convex shape having a thin wall portion 20a by reducing the thickness at both ends, and the portion of the lower surface of the anode terminal 20 that is to be a mounting surface is extended outwardly, so that a top view is obtained. The anode terminal protruding portion 20b protruding from the exterior resin 12 is provided in the same manner as the anode terminal 16 according to the fifth embodiment, but the solid electrolytic capacitor according to the present embodiment has the anode terminal protruding portion 20b as the exterior. The resin 12 is bent upward along the side surface.

  Similarly, the cathode terminal 22 is provided with cathode terminal projections 22c, 22d by extending the mounting portion 22b outward from the bottom surface of the cathode terminal 22 and the mounting portion 22b. 22d is bent upward along the side surface of the exterior resin 12.

  The solid electrolytic capacitor according to the present embodiment configured as described above is configured to be mounted on the substrate by having the anode terminal protruding portion 20b and the cathode terminal protruding portions 22c and 22d bent along the side surface of the exterior resin 12. When soldering is performed, the solder fillet is easily formed and the solder fillet can be easily confirmed from the upper surface, so that the reliability of soldering can be further improved. It will be.

  Although not shown in the drawings, according to the present embodiment, the exterior resin 12 is provided with a recess into which the anode terminal projection 20b and the cathode terminal projections 22c, 22d are bent along the side surface of the exterior resin 12. The size can be reduced without increasing the external dimensions of the solid electrolytic capacitor.

(Embodiment 9)
Hereinafter, the ninth embodiment of the present invention will be described with reference to the fifth and sixth aspects of the present invention.

  In the present embodiment, the anode terminal protruding portion and the cathode terminal protruding portion of the solid electrolytic capacitor according to Embodiment 6 are bent upward along the side surface of the exterior resin, and the other configuration is the embodiment. 6, the same reference numerals are given to the same parts, and detailed description thereof is omitted, and only different parts will be described below with reference to the drawings.

  11A to 11D are a plan sectional view, a front sectional view, a bottom sectional view, and a side sectional view showing the structure of a solid electrolytic capacitor according to Embodiment 9 of the present invention. In FIG. A terminal 23 is a cathode terminal.

  The anode terminal 20 is formed in a reverse convex shape having a thin wall portion 20a by reducing the thickness at both ends, and by extending a portion of the lower surface of the anode terminal 20 that is a mounting surface outward, The anode terminal projecting portion 20b projecting from the exterior resin 12 is provided in the same manner as the anode terminal 16 according to the sixth embodiment, but the solid electrolytic capacitor according to the present embodiment has the anode terminal projecting portion 20b disposed on the exterior. In this configuration, the resin 12 is bent upward along the side surface.

  Similarly, the cathode terminal 23 is provided with cathode terminal projecting portions 23b and 23c by extending the mounting surface on the lower surface of the cathode terminal 23 outward, and the cathode terminal projecting portions 23b and 23c are provided as exterior resin 12. It is made into the structure bent upwards along the side surface.

  The solid electrolytic capacitor according to the present embodiment configured as described above has a configuration in which the anode terminal protruding portion 20b and the cathode terminal protruding portions 23b and 23c are bent along the side surface of the exterior resin 12, thereby mounting the substrate. When soldering is performed, the solder fillet is easily formed and the solder fillet can be easily confirmed from the upper surface, so that the reliability of soldering can be further improved. It will be.

  Further, although not shown in the drawings, the exterior resin 12 is provided with a recess into which the anode terminal projection 20b and the cathode terminal projections 23b and 23c are bent along the side surface of the exterior resin 12, thereby providing the present embodiment. The size can be reduced without increasing the external dimensions of the solid electrolytic capacitor.

(Embodiment 10)
The tenth embodiment of the present invention will be described below with reference to the fifth and sixth aspects of the present invention.

  In the present embodiment, the shape of the cathode terminal of the solid electrolytic capacitor according to the ninth embodiment is partially different, and the configuration other than this is the same as that of the ninth embodiment. Detailed description thereof will be omitted, and only different parts will be described below with reference to the drawings.

  12A to 12D are a plan sectional view, a front sectional view, a bottom sectional view, and a side sectional view showing the structure of the solid electrolytic capacitor according to the tenth embodiment of the present invention. In FIG. The cathode terminal 24 is arranged on the same surface as the lower surface of the anode terminal 20 (the surface to be mounted on the substrate), and the lower surface of the cathode terminal 24 is connected to the anode terminal 20. Although the configuration as close as possible to the bottom surface is the same as in the ninth embodiment, the cathode terminal 24 according to the present embodiment has both ends in the direction intersecting the direction connecting the anode terminal 20 and the cathode terminal 24. In this configuration, the thin portion 24a is provided.

  In the solid electrolytic capacitor according to the present embodiment configured as described above, in addition to the effects obtained by the solid electrolytic capacitor according to the ninth embodiment, the cathode terminal 24 can be more easily manufactured, and at the time of mounting on the substrate. A special effect of improving stability is obtained.

  In the solid electrolytic capacitor according to the present invention, the anode terminal and the cathode terminal are each formed in a flat plate shape, the lower surface serving as the mounting surface is disposed on the same reference surface, and the lower surface serving as the mounting surface of the cathode terminal is disposed on the anode. The distance from the capacitor element to the terminal is as close as possible to the bottom surface, which is the mounting surface of the terminal, with a minimum gap of 1.0 mm, and a thin portion is provided on both ends of the anode terminal and on the opposite side of the cathode terminal to the anode terminal side. Since the anode terminal and the cathode terminal can be made as close as possible, the ESR characteristic is excellent and the ESL can be reduced. Especially, it is used around the CPU of a personal computer. It is useful as a capacitor.

(A) Plan sectional view showing the configuration of the solid electrolytic capacitor according to Embodiment 1 of the present invention, (b) Front sectional view, (c) Bottom sectional view, (d) Side sectional view Partially cutaway perspective view showing a capacitor element used in the solid electrolytic capacitor (A) The top view which showed the base material which provided the anode terminal and the cathode terminal, (b) Sectional drawing in the AA line (A) Plan sectional view showing the configuration of the solid electrolytic capacitor according to Embodiment 2 of the present invention, (b) Front sectional view, (c) Bottom sectional view, (d) Side sectional view (A) Plan sectional drawing which showed the structure of the solid electrolytic capacitor by Embodiment 3 of this invention, (b) Same front sectional view, (c) Same bottom sectional view, (d) Same side sectional view same perspective view (A) Plan sectional drawing which showed the structure of the solid electrolytic capacitor by Embodiment 4 of this invention, (b) The front sectional drawing, (c) The bottom sectional drawing, (d) The side sectional drawing (A) Plan sectional drawing which showed the structure of the solid electrolytic capacitor by Embodiment 5 of this invention, (b) The front sectional drawing, (c) The bottom sectional drawing, (d) The side sectional drawing (A) Plan sectional drawing which showed the structure of the solid electrolytic capacitor by Embodiment 6 of this invention, (b) The front sectional drawing, (c) The bottom sectional drawing, (d) The side sectional drawing (A) Plan sectional view showing the configuration of a solid electrolytic capacitor according to Embodiment 7 of the present invention, (b) Front sectional view, (c) Bottom sectional view, (d) Side sectional view (A) Plan sectional drawing which showed the structure of the solid electrolytic capacitor by Embodiment 8 of this invention, (b) The front sectional drawing, (c) The bottom sectional drawing, (d) The side sectional drawing (A) Plan sectional drawing which showed the structure of the solid electrolytic capacitor by Embodiment 9 of this invention, (b) The front sectional drawing, (c) The bottom sectional drawing, (d) The side sectional drawing (A) Plan sectional drawing which showed the structure of the solid electrolytic capacitor by Embodiment 10 of this invention, (b) The front sectional drawing, (c) The bottom sectional drawing, (d) The side sectional drawing Sectional view showing the structure of a conventional solid electrolytic capacitor Same perspective view Partially cutaway perspective view showing a capacitor element used in the solid electrolytic capacitor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitor element 2 Anode body 3 Resist part 4 Anode part 5 Cathode part 6 Solid electrolyte layer 7 Cathode layer 8 Anode lead frame 8a, 9a, 9b Guide part 8b, 10b, 11b Joining part 9 Cathode lead frame 10, 16, 20 Anode Terminals 10a, 11a, 14a, 15a, 16a, 17a, 20a, 24a Thin portions 11, 14, 15, 17, 18, 19, 21, 22, 23, 24 Cathode terminals 12 Exterior resin 13 Base 13a Feed hole 14b, 18b Mounting part 16b, 20b Anode terminal protrusion 17b, 18c, 18d, 19b, 19c, 21b, 22c, 22d, 23b, 23c Cathode terminal protrusion

Claims (8)

An insulating portion is provided at a predetermined position of an anode body made of a valve metal having a roughened surface and a dielectric oxide film layer formed thereon, and is separated into an anode portion and a cathode portion. A capacitor element formed by sequentially laminating a solid electrolyte layer composed of a conductive polymer and a cathode layer thereon, and an anode terminal and a cathode terminal in which the anode part and the cathode part of the capacitor element are respectively joined to the upper surface; In the solid electrolytic capacitor made of an insulating exterior resin in which the capacitor element is integrally covered with the lower surface to be the mounting surface of the anode terminal and the cathode terminal exposed, the anode terminal and the cathode terminal are each configured in a flat plate shape In addition, the lower surface serving as the mounting surface is disposed on the same reference surface, and the lower surface serving as the mounting surface of the cathode terminal is close to the lower surface serving as the mounting surface of the anode terminal up to a minimum distance of 1.0 mm. Only, further ends of the anode terminal and the solid electrolytic capacitor in which a respective thin portions on the opposite side of the anode terminal side of the cathode terminal. The solid electrolytic capacitor according to claim 1, wherein a mounting portion having a lower surface serving as a mounting surface is provided at a substantially central portion opposite to the anode terminal side of the thin portion provided in the cathode terminal. The solid electrolytic capacitor according to claim 2, wherein the mounting surface of the mounting portion provided on the cathode terminal and the mounting surface of the cathode terminal are connected to each other so that the lower surface serving as the mounting surface of the cathode terminal is substantially T-shaped. The solid electrolytic capacitor according to any one of claims 1 to 3, wherein a portion to be a mounting surface on the lower surface of the anode terminal and / or the cathode terminal is extended so as to protrude outward from the exterior resin in a top view. The solid electrolytic capacitor according to claim 4, wherein a portion of the anode terminal and / or the cathode terminal that protrudes outward from the exterior resin is bent upward along the side surface of the exterior resin. 6. The solid electrolytic capacitor according to claim 5, wherein the exterior resin is provided with a recess into which a portion bent upward along the side surface of the exterior resin of the anode terminal and / or the cathode terminal is fitted. 2. The solid electrolytic capacitor according to claim 1, wherein a step difference between the anode terminal and a lower surface serving as a mounting surface of the thin portion provided in the cathode terminal is 80 μm or more. The solid electrolytic capacitor according to claim 1, wherein the valve metal constituting the anode body is aluminum, tantalum, niobium, or a combination of two or more thereof.

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