JP2008252010A - Electrolytic capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an inductance in an electrolytic capacitor, such as, a solid electrolytic capacitor and an electric double-layer capacitor. <P>SOLUTION: Magnetic fields generated on a plurality of lead terminals (inner leads 121, 122, 141, and 142) are offset among the lead terminals on the same polarity side, the lead terminals being connected to electrode foil (anode foil 26 and cathode foil 28) on the anode side or the cathode side of a capacitor element 4 and drawn from an element end face 10 with the same polarity sides adjacent to each other. In this configuration, magnetic fields are offset among the same polarities of a plurality of external terminals (external leads 161, 162, 181, and 182), the external terminals being connected with the same polarity sides adjacent to each other, to a sealing member 8 for sealing a case (outer case 6) or the capacitor element disposed on the case. This configuration can realize reduction of the inductance on the lead terminals or the external terminals. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a reduction in inductance of an electrolytic capacitor such as a solid electrolytic capacitor or an electric double layer capacitor, and more particularly to a lead terminal portion of a capacitor element or a lead-out or arrangement structure of an external terminal portion connected to the capacitor element.

  In computers and various digital devices equipped with computers, the drive frequency is increased, the drive voltage is reduced, and the drive current is increased. In the processor that controls the heart of digital processing, the driving voltage is reduced as the speed increases. A voltage control module (VRM) composed of a DC-DC converter is used as a highly accurate power supply source for the processor. Lowering the voltage of the processor narrows its guaranteed operating voltage range. In addition, since the load current for the processor changes at a very high speed, a load capacitor is provided on the output side of the VRM to cope with the load fluctuation on the processor side. As the load capacitor, an electrolytic capacitor is used. In order to reduce the loss, the electrolytic capacitor corresponds to a reduction in equivalent series resistance (ESR), a large current and a high speed, and di / Since dt is increased, it is required to reduce the equivalent series inductance (ESL).

  With regard to ESL technology relating to such electrolytic capacitors, Patent Document 1 discloses that leads are connected to 1/4 and 3/4 positions of the total length of two electrode foils, and different polarity terminals are connected to each other via an insulating sleeve. A winding capacitor is disclosed in which an element is wound in a state of facing each other. Patent Document 2 discloses a configuration in which a terminal and an auxiliary terminal are connected to each electrode foil, and the same polarity terminal or auxiliary terminal is connected after winding (FIGS. 3, 5, and 6). .

  Further, in Patent Document 3, a plurality of lead terminals are attached to each of the anode foil and the cathode foil, and after winding these foils, the lead terminals in the vicinity of the element outer periphery of the lead terminals of the respective poles are bent, It is disclosed to connect to a lead terminal (FIG. 5).

Patent Document 4 discloses a wound electrolytic capacitor in which the number of anode and cathode side lead terminals is 2 to 4, respectively (FIGS. 2 and 3).

Japanese Utility Model Publication No. 49-139531 Japanese Utility Model Publication No. 57-71331 JP 2003-297777 A JP 2004-179621 A

  By the way, in the lead arrangement position described in Patent Document 1, as shown in FIGS. 4 and 5, there is merely disclosed an element in which a plurality of lead foils are drawn adjacently to the element end face. In such a structure of the drawer foil, it is impossible to reduce the ESL in the drawer foil portion, and the ESL is increased due to the influence of the magnetic field as much as the lead is routed.

  Patent Document 2 only discloses a structure in which the auxiliary terminal and the lead terminal are connected within the element, and the substantial lead terminal portion has a two-terminal configuration. In such a lead terminal portion, ESL can be reduced. I can't plan.

  Patent Document 3 has a structure in which electrode foils are connected in parallel, and since the lead terminals (+ and-) inside the element are close to each other, the magnetic field is reduced, and the ESL is reduced on the electrode foil side. However, ESL on the lead portion side outside the element cannot be reduced.

  Patent Document 4 discloses that the ESR and ESL can be reduced by increasing the number of terminals due to the parallel effect. However, if the terminals on the same pole side are arranged on a diagonal line, the parallelism is achieved. When connecting terminals of the same polarity, the connection lines and the connection patterns on the substrate must be crossed. If such a wiring configuration is adopted, there is a risk of increasing ESL on the connection side.

  By the way, the ESL of the electrolytic capacitor and its capacitor element is most noticeable because the lead-out terminal portion that leads out the lead portion from the element is dominant. In the electrode foil portion, current flows in the opposite direction to the anode foil and the cathode foil. Therefore, even if a magnetic field is generated in each foil, they cancel each other, so that ESL is not increased, and the same applies to other current paths. It is. Since currents flow through the lead terminal portion on the anode side and the cathode side, it has been confirmed that the arrangement influences the ESL.

  With the increase in current and speed of the processor, there is a strong demand for reduction in ESL in electrolytic capacitors used as load capacitors for VRMs.

Therefore, an object of the present invention is to reduce the inductance of electrolytic capacitors such as solid electrolytic capacitors and electric double layer capacitors.

  In order to achieve the above object, the present invention relates to an electrolytic capacitor such as a solid electrolytic capacitor or an electric double layer capacitor, and is connected to the electrode foil on the anode side or the cathode side of the capacitor element and is drawn out from the end face of the element, and the same polarity side The magnetic field generated in each of the plurality of lead terminal portions arranged adjacent to each other is canceled between the lead terminal portions on the same polarity side, and the sealing member for sealing the case or the capacitor element installed in the case In addition to being connected, the structure that offsets the magnetic field between the same polarity of each of the plurality of external terminal portions arranged with the same polarity side adjacent to each other realizes low inductance at the lead terminal portion or the external terminal portion. Yes.

  Accordingly, in order to achieve the above object, a first aspect of the present invention is an electrolytic capacitor such as a solid electrolytic capacitor or an electric double layer capacitor, and includes a capacitor element including electrode foils on the anode side and the cathode side, and the capacitor A plurality of lead terminal portions connected to electrode foils on the anode side or the cathode side of the device and drawn out from the end face of the device and arranged with the same polarity side adjacent to each other, and the magnetic fields generated in the lead terminal portions are the same. This is a structure that cancels between the lead terminal portions on the pole side. With such a configuration, the above object can be achieved.

  In order to achieve the above object, in the electrolytic capacitor, preferably, the distance between the lead terminal portions on the same polarity side may be larger than the distance between the adjacent lead terminal portions on the different polarity side, or the anode Side first and cathode side first lead terminal portions are disposed adjacent to each other, an anode side second lead terminal portion is disposed on the anode side first lead terminal portion side, and the cathode side first lead terminal portion is disposed. A second lead terminal portion on the cathode side may be provided on the lead terminal portion side, and the first and second lead terminal portions may be arranged in a straight line on the element end face. With such a configuration, the above object is achieved.

  In order to achieve the above object, a second aspect of the present invention is an electrolytic capacitor such as a solid electrolytic capacitor or an electric double layer capacitor, in which a capacitor element is enclosed, and a sealing member that seals the case or the case And a plurality of external terminal portions arranged adjacent to the same polarity side of the anode side or the cathode side, and a magnetic field between the same polarity of the external terminal portions. The configuration is offset. With such a configuration, the above object can be achieved.

  In order to achieve the above object, in the electrolytic capacitor, preferably, the distance between the external terminal parts on the same polarity side may be larger than the distance between adjacent external terminal parts on the different polarity side, The first external terminal portion on the anode side and the cathode side are installed adjacent to each other, the second external terminal portion on the anode side is installed on the first external terminal portion side on the anode side, and the first external terminal portion on the cathode side is installed. A second external terminal portion on the cathode side may be installed on the external terminal portion side, and the first and second external terminal portions may be arranged in a straight line on the element end face. The above object can also be achieved by such a configuration.

  In order to achieve the above object, in the electrolytic capacitor, preferably, a solid electrolyte obtained by chemically polymerizing thiophene or a derivative thereof in the capacitor element may be used, and the thiophene derivative is 3,4-ethylene. The structure may be dioxythiophene, the solid electrolyte may be a TCNQ complex, or the sealing member may be an airtight resin. With such a configuration, the above object can be achieved.

  According to the present invention, the following effects can be obtained.

  (1) The magnetic field generated in the lead terminal portion drawn out from the capacitor element is canceled between the lead terminal portions on the same polarity side, so that the inductance at the lead terminal portion can be reduced.

  (2) The magnetic field generated in the sealing member enclosing the capacitor element or the external terminal portion installed in the case is canceled between the external terminal portions on the same polarity side, and the inductance at the external terminal portion can be reduced.

(3) If such an electrolytic capacitor is used, the drive frequency is increased in the computer and various digital devices equipped with the computer, and the drive voltage is reduced. It can contribute to the conversion.

[First Embodiment]

  The electrolytic capacitor according to the first embodiment will be described with reference to FIG. 1, FIG. 2, FIG. 3, and FIG. 1 is an exploded perspective view showing an example of an electrolytic capacitor, FIG. 2 is a diagram showing an element end face of the capacitor element, FIG. 3 is a cross-sectional view showing a sealing portion of the electrolytic capacitor, and FIG. 4 is seen from the sealing face portion. It is a figure which shows an electrolytic capacitor.

  As shown in FIG. 1, the electrolytic capacitor 2 includes a capacitor element 4, an outer case 6, and a sealing member 8. The capacitor element 4 is a cylindrical winding element, and a holding tape 9 is wound around the outer peripheral portion. The element end face 10 of the capacitor element 4 has a plurality of lead terminal portions or first and second anode side portions. The internal lead portions 121 and 122 are drawn out as lead terminal portions, and the internal lead portions 141 and 142 are drawn out as first and second lead terminal portions on the cathode side, and a plurality of external terminal portions or first and second on the anode side are drawn out. External lead portions 161 and 162 are connected to the internal lead portions 121 and 122, respectively, as external terminal portions, and the internal lead portions 141 and 142 are used as a plurality of external terminal portions or first and second external terminal portions on the cathode side. External lead portions 181 and 182 are respectively connected to the.

  Referring to FIG. 2 for the internal lead parts 121, 122, 141, 142, a hollow core part 20 is formed at the center of the element end surface 10 of the capacitor element 4, and the core part 20 is sandwiched between them. The anode side internal lead parts 121 and 122 and the cathode side internal lead parts 141 and 142 are arranged in a line in the diameter direction of the element end face 10 with the winding core part 20 as the center. In the figure, reference numeral 23 denotes an imaginary line indicating that the internal lead parts 121, 122, 141, 142 are arranged in a straight line.

  Regarding the positional relationship on the element end face 10 of these internal lead parts 121, 122, 141, 142, the distance between the centers of the internal lead parts 121, 141 is R1, and the distance between the centers of the internal lead parts 121, 122 or the internal lead parts 141, 142 is When the distance is R2, the distance between the centers of the internal lead parts 122 and 142 is R3, and the diameter of the capacitor element 4 is R4, the relationship is R1 ≦ R2 <R3 <R4.

  The outer case 6 is, for example, a cylindrical container that is a molded body such as an aluminum plate, and has a volume capable of accommodating the capacitor element 4. As shown in FIG. 3, the opening 22 is a sealing member 8. Sealed. The sealing member 8 is formed of an airtight resin having elasticity such as rubber, for example. The sealing member 8 is formed with a plurality of lead through holes 24 arranged in a line in accordance with the lead terminal portion.

  The capacitor element 4 and the sealing member 8 are integrated into the lead through hole 24 through the internal lead parts 121, 122, 141, 142 and the external lead parts 161, 162, 181, 182 and inserted into the outer case 6, The outer case 6 is sealed by a caulking process and a curling process on the opening 22 side.

  Therefore, as shown in FIG. 4, the external lead portions 161, 162, 181, 182 are arranged in a row (on the imaginary line 23) in the diameter direction of the sealing member 8 on the sealing member 8 of the electrolytic capacitor 2. . The distance between the centers of the external lead portions 161 and 181 is the same as that of the internal lead portions 121 and 141, and the distance between the centers of the external lead portions 161 and 162 or the external lead portions 181 and 182 is the internal lead portions 121 and 122 or the internal leads. The distance between the centers of R2 and the external lead parts 162 and 182 is R3 as in the parts 141 and 142, and R3 as in the internal lead parts 122 and 142. If the diameter of the outer case 6 is R5, R1 ≦ R2 <R3 < R5 relationship.

  The capacitor element 4 is referred to FIG. FIG. 5 is a diagram illustrating an exploded state of the capacitor element (or a capacitor element being manufactured). In FIG. 5, the same parts as those in FIG.

  The capacitor element 4 is obtained by winding an anode foil 26 and a cathode foil 28 with separators 30 and 32 interposed therebetween. A cathode foil 28 is formed by etching a foil similar to the anode foil 26. The separators 30 and 32 are electrolytic paper interposed between the anode foil 26 and the cathode foil 28. The capacitor element 4 is impregnated with a solid electrolyte obtained by chemically polymerizing thiophene or a derivative thereof in the capacitor element 4. The thiophene derivative may be composed of 3,4-ethylenedioxythiophene, and the solid electrolyte may be composed of a TCNQ complex. These solid electrolytes contribute to the low ESR of the capacitor element 4.

  The element end face 10 of the capacitor element 4 is formed by the edges of the separators 30 and 32 because the separators 30 and 32 are wider than the anode foil 26 and the cathode foil 28 in order to insulate the anode foil 26 and the cathode foil 28. ing.

  An equivalent circuit of the electrolytic capacitor 2 configured as described above is configured as shown in FIG. As is apparent from this equivalent circuit, the electrolytic capacitor 2 includes internal lead portions 121 and 122 and external leads 161 and 162 for a single anode foil 26, and internal lead portions 141 and 162 for a single cathode foil 28. 142 and external leads 181 and 182 are provided, so that it has a four-terminal configuration of two terminals on the anode side and two terminals on the cathode side.

  Further, when a current i flows through the internal lead portions 121 and 122 and the internal lead portions 141 and 142, as shown in FIG. 7, a magnetic field φ that circulates the current i is applied to each of the internal lead portions 121, 122, 141, and 142. appear. The equivalent series inductance ESL is a phenomenon in which an electromotive force in the direction opposite to the original current i occurs in the terminal.

  In the case of a four-terminal arrangement such as the internal lead parts 121, 122, 141, 142, the magnetic field φ intensifies in the region D1 between the internal lead parts 121, 141, whereas between the internal lead parts 121, 122 Of the region D2 and the region D2 between the internal lead portions 141 and 142, the magnetic field φ cancels each other. Even if the magnetic field φ is strengthened in the region D1, the magnetic field φ is generated in the two regions D2. Since it is weakened, ESL at the lead terminal portion can be reduced.

  Such an ESL reduction effect is similarly provided for the external lead portions 161, 162, 181, and 182 with four terminals. Therefore, even if the magnetic field φ is strengthened in the region D3 between the external lead portions 161 and 181, In the region D2 between the external lead portions 161 and 162 and in the region D2 between the external lead portions 181 and 182, the magnetic field φ cancels each other, and the magnetic field φ is weakened in the two regions D2, so that the ESL at the lead terminal portion is reduced. Can be small.

  In the above embodiment, as shown in FIG. 2 or 4, since R1 <R2, the region D2 that cancels the magnetic field φ is widened, and the regions D1 and D3 that are strengthened are narrowed. Therefore, the ESL reduction effect is further achieved.

Further, the equivalent series resistance (ESR) of the internal lead part 121 and the external lead 161, the internal lead part 122 and the external lead 162, the internal lead part 141 and the external lead 181, and the internal lead part 142 and the external lead 182 are set to r1, r2, If r3 and r4, the anode-side internal lead 121 and external lead 161 and the internal lead 122 and external lead 162 are in parallel relationship, and the cathode-side internal lead 141 and external lead 181 and internal lead 142 Since the ESR on the anode lead side is ΣRa and the ESR on the cathode lead side is ΣRk.
Σra = r1 / r2 / (r1 + r2) (1)
Σrk = r3 · r4 / (r3 + r4) (2)
If r1, r2, r3, and r4 are approximated with r, Σra = r / 2 and Σrk = r / 2, and ESR is reduced by parallelization.

Further, the equivalent series inductances (ESL) of the internal lead part 121 and the external lead 161, the internal lead part 122 and the external lead 162, the internal lead part 141 and the external lead 181, and the internal lead part 142 and the external lead 182 are XL1, XL2, XL3 and XL4, the anode-side internal lead 121 and external lead 161 and the internal lead 122 and external lead 162 are in parallel relation, and the cathode-side internal lead 141 and external lead 181 and internal lead 142 Since the ESL on the anode lead side is ΣXLa and the ESL on the cathode lead side is ΣXLk.
ΣXLa = XL1 · XL2 / (XL1 + XL2) (3)
ΣXLk = XL3 · XL4 / (XL3 + XL4) (4)
If XL1, XL2, XL3, and XL4 are approximated to XL, ΣXLa = XL / 2 and ΣXLk = XL / 2, and ESL is reduced by parallelization.

  According to such an electrolytic capacitor 2 with reduced ESL, it can be used for a load capacitor of a VRM where the current of the microprocessor is increased and the speed is increased, and it can contribute to the higher efficiency.

  In addition, when the ESL increases due to the increase in ESL due to the routing of the pattern on the mounting substrate on which the electrolytic capacitor 2 is mounted or the use of a multilayer substrate, the ESL increases. Is most effective.

[Second Embodiment]

  FIG. 8 is referred to for the method for manufacturing the electrolytic capacitor according to the second embodiment. FIG. 8 is a diagram illustrating an example of an electrode foil and a separator of a capacitor element. In FIG. 8, the same parts as those in FIGS. 1 and 5 are denoted by the same reference numerals.

  The method for manufacturing the electrolytic capacitor 2 includes a lead terminal connecting step, a capacitor element 2 winding step, an enclosure case 6 sealing step, and the like.

  (1) Lead terminal connection process

  As lead terminal portions, a lead terminal connecting the internal lead portion 121 and the external lead portion 161, a lead terminal connecting the internal lead portion 122 and the external lead portion 162, and connecting the internal lead portion 141 and the external lead portion 181 are connected. A lead terminal, a lead terminal connecting the internal lead part 142 and the external lead part 182 is formed.

  As shown in FIG. 8, internal lead portions 121, 122, 141, and 142 are connected to the above-described anode foil 26 and cathode foil 28 as a plurality of lead terminal portions.

  (2) Capacitor element 4 winding process, etc.

  In the winding of the capacitor element 4, the anode foil 26, the cathode foil 28, and the separators 30 and 32 are alternately wound on the same winding axis, and held by the holding tape 9 to form the capacitor element 4. is there. The capacitor element 4 is impregnated with a solid electrolyte obtained by chemically polymerizing thiophene or a derivative thereof in the capacitor element 4.

  And the capacitor | condenser element 4 is accommodated in the exterior case 6, the exterior case 6 is sealed with the sealing member 8, and the electrolytic capacitor 2 is obtained.

  In the method of manufacturing the electrolytic capacitor 2, in the step of connecting the lead terminal to the capacitor element 4, as shown in FIGS. 1 and 2, a step for linearly arranging the internal lead portions 121, 122, 141, 142. In this step, the connection position of the lead terminal portion to the anode foil 26 and the cathode foil 28 is determined by the winding start ends of the anode foil 26 and the cathode foil 28, the interval according to the winding diameter, or the winding end. Adjustment with two or more of any of the above is included.

  Specifically, as shown in FIG. 8, the capacitor element 4 is formed of an anode foil 26, a cathode foil 28, and separators 30 and 32. The thickness of the separators 30 and 32 is d1, the thickness of the cathode foil 28 is d2, The thickness of the anode foil 26 is d3, and the winding start end S1 is set in the separators 30 and 32 in common. The length of the external lead portion 161 on the anode side and the external lead portion 181 on the cathode side or the length of the external lead portion 162 on the anode side 26 and the external lead portion 182 on the cathode side is L1, and the external lead portion 161 on the anode side. 162, or the length between the cathode-side external lead portions 181 and 182 is set to L2. Further, the length from the winding start end S1 of the separators 30 and 32 to the winding start end S2 of the cathode foil 28 is L01, the length from the winding start end S2 to the external lead 181 is L02, and the anode foil 26 The length from the winding start end S3 to the external lead portion 161 is L03, the length from the external lead portion 182 to the winding end portion E2 of the cathode foil 28 is L04, and the winding end from the external lead portion 162 of the anode foil 26 to the winding end. The length to the part E3 is set to L05.

  9, the diameter of the core part 20 of the capacitor element 4 is R0, the interval between the internal lead parts 121 and 141 is R1, and the interval between the internal lead parts 122 and 142 is R3. When the number of turns of the cathode foil 28 is n0 and the number of overlapping turns of the separator 30, the cathode foil 28, the separator 32, and the anode foil 26 at the interval R3 is n2, the following relational expression is set.

  (1) L02

L01 to L05 are arbitrary design values. For example, L02 is:
L02 = π × n0 × (r0 + R1) / 2 (5)
Similarly, L01 and L03-L05 are also set.

  (2) L1

L1 is
L1 = π × R1 / 2 (6)
It is.

  (3) L2

L2 is
L2 = π × n2 × (R1 + R3) / 2 (7)
It is.

  (4) Relationship of n2, (d1 + d2 + d3 + d4), (R3-R1) / 2

n2, (d1 + d2 + d3 + d4), (R3-R1) / 2,
n2 × (d1 + d2 + d3 + d4) <(R3-R1) / 2 (8)
And the thickness d is relatively defined.

  Based on such conditions, the anode side and cathode side internal lead parts 121, 122, 141, 142 are arranged on the element end face 10 of the capacitor element 4 in the diameter direction of the capacitor element 4 with the winding core part 20 as the center. be able to.

[Third Embodiment]

  The electrolytic capacitor according to the third embodiment will be described with reference to FIG. In the electrolytic capacitor 2, the two internal lead portions 121 and 122 are provided on the anode foil 26 and the two internal lead portions 141 and 142 are provided on the cathode foil 28. As shown in FIG. For example, four internal lead portions 121, 122, 123, and 124 may be installed, and the internal lead portions 121 and 123 and the internal lead portions 122 and 124 may be connected to the external lead portions 161 and 162. For example, four internal lead parts 141, 142, 143, 144 may be installed as terminals, and the internal lead parts 141, 143 and the internal lead parts 142, 144 may be connected to the external lead parts 181, 182. Even in such a configuration, the same effect as the above-described embodiment can be obtained.

[Fourth Embodiment]

An electrolytic capacitor according to the fourth embodiment will be described with reference to FIG. In the above embodiment, a plurality of lead terminals are installed on the single capacitor element 4, but as shown in FIG. 11, a plurality of capacitor elements 41, 42... The anode-side internal lead part 120 drawn out from the element 41-4n is used as external lead parts 161 and 162 as a plurality of external lead terminals, and the cathode-side internal lead part 140 is used as external lead terminals 181 and 182 as a plurality of external lead terminals. It is good also as a structure to connect. Even in such a configuration, the same effect as the above-described embodiment can be obtained.

  In this example, the surface of the aluminum foil was roughened with an etching solution to increase the surface area, and then the anode foil 26 having a dielectric oxide film formed thereon, and the cathode having the surface of the aluminum foil roughened with an etching solution as described above. Foil 28 was prepared, and two lead terminals for external lead were each attached to the electrode foil. Capacitor element 4 was formed by winding separators 30 and 32 made of kraft paper or manila paper between anode foil 26 and cathode foil 28. In the wound capacitor element 4, internal lead parts 121, 122, 141, 142 are led out from one element end face 10 as lead terminals.

  The arrangement (pitch) of the lead terminals is as shown in Table 1.

  The capacitor element 4 is re-formed with an aqueous solution of ammonium adipate and the like, and the dielectric oxide film generated in the winding process is repaired. The capacitor element 4 is impregnated with an ethylenedioxythiophene monomer solution and an oxidizing agent, In the device 4, polyethylenedioxythiophene was chemically oxidatively polymerized to form a solid electrolyte.

  In a high temperature atmosphere in which the capacitor element 4 is housed in the outer case 6 and airtight resin such as epoxy resin softened or liquefied is injected from the opening of the outer case 6 and then solidified and sealed to obtain a solid electrolytic capacitor Aging was performed by applying a rated voltage between the terminals to obtain a finished product.

  Table 2 shows the electrical characteristics of the examples of the electrolytic capacitor and the conventional example.

  As is clear from this example, it can be understood that both the ESR and the ESL are lower in the electrolytic capacitor according to the present invention than in the conventional example.

  Next, referring to FIGS. 12, 13, and 14 for mounting examples of the substrate. FIG. 12 is a view showing an example of mounting the electrolytic capacitor according to the present invention, and FIGS. 13 and 14 are views showing comparative examples. In FIG. 12, the same parts as those of FIG.

  As shown in FIG. 12, conductive patterns 38 and 40 are formed on the circuit board 36 in a straight line. The conductive pattern 38 includes external lead portions 161 and 162 on the anode side of the electrolytic capacitor 2, and the conductive pattern 40. External lead portions 181 and 182 on the cathode side are connected in common, and the electrolytic capacitor 2 is connected between the conductive patterns 38 and 40.

  As shown in FIG. 13A, in the electrolytic capacitor 46 in which the anode-side external lead portions 421 and 422 and the cathode-side external lead portions 441 and 442 are formed, as shown in FIG. 48 requires conductive patterns 50 and 52 having parallel lines. External lead portions 421 and 422 of the electrolytic capacitor 46 are connected to the conductive pattern 50, and external lead portions of the electrolytic capacitor 46 are connected to the conductive pattern 52. 441 and 442 are connected. In such external lead portions 421, 422, 441, 442, connection with a single-layer substrate is possible, but since the effect of reducing the magnetic field due to current is reduced, compared to the linear four-terminal structure according to the present invention, ESL reduction effect is low.

  As shown in FIG. 14A, in the electrolytic capacitor 58 in which the anode-side external lead portions 541 and 542 and the cathode-side external lead portions 561 and 562 are arranged diagonally, as shown in FIG. 14B, The circuit board 60 needs to be internally connected using a multilayer board. In the circuit board 60, reference numerals 62, 64, and 66 denote conductor pattern portions on the anode side, and reference numerals 68, 70, and 72 denote conductor pattern portions on the cathode side, which are insulated by the level of the insulating substrate. In such an electrolytic capacitor 58, it is necessary to use a multilayer substrate for the circuit board 60, and ESL due to wiring routing increases, which may complicate the board design.

As described above, the most preferred embodiments and examples of the present invention have been described. However, the present invention is not limited to the above description, and is described in the claims or disclosed in the specification. It goes without saying that various modifications and changes can be made by those skilled in the art based on the gist of the invention, and such modifications and changes are included in the scope of the present invention.

The present invention relates to an electrolytic capacitor and a method of manufacturing the same, and is generated in a plurality of lead terminal portions connected to an electrode foil on the anode side or the cathode side of the capacitor element and drawn out from the end face of the capacitor element. The magnetic field generated between the lead terminal portions on the same polarity side is canceled between the lead terminal portions on the same polarity side. In addition, the magnetic field generated in the external terminal portion installed in the sealing member or case enclosing the capacitor element is canceled between the external terminal portions on the same polarity side, and the external terminal portion Low inductance can be achieved, which is useful.

It is a disassembled perspective view which shows the electrolytic capacitor which concerns on 1st Embodiment. It is a figure which shows the element end surface of a capacitor | condenser element. It is sectional drawing which shows the sealing part of an electrolytic capacitor. It is a top view which shows the sealing part of an electrolytic capacitor. It is a figure which shows the decomposition | disassembly state of a capacitor element. It is a figure which shows the equivalent circuit of an electrolytic capacitor. It is a figure which shows the cancellation of the magnetic flux of the capacitor | condenser element or electrolytic capacitor of a 4 terminal structure. It is a figure which shows the structural example of a capacitor | condenser element. It is a figure which shows the lead part and winding core part of the element end surface of a capacitor | condenser element. It is a figure which shows the equivalent circuit of the electrolytic capacitor which concerns on 2nd Embodiment. It is a figure which shows the equivalent circuit of the electrolytic capacitor which concerns on 3rd Embodiment. It is a figure which shows the example of mounting of the electrolytic capacitor based on this invention. It is a figure which shows the mounting comparative example of another electrolytic capacitor. It is a figure which shows the mounting comparative example of another electrolytic capacitor.

Explanation of symbols

2 Electrolytic capacitor 4 Capacitor element 6 Exterior case 8 Sealing member 10 Element end face 121, 122, 123, 124, 141, 142, 143, 144 Internal lead part 161, 162, 181, 182 External lead part 20 Winding core part 23 Virtual wire 26 Anode foil 28 Cathode foil 30, 32 Separator

Claims (10)

A capacitor element comprising electrode foils on the anode side and the cathode side;
A plurality of lead terminal portions connected to the electrode foil on the anode side or the cathode side of the capacitor element and drawn out from the end face of the capacitor element, and arranged adjacent to the same polarity side, and
An electrolytic capacitor characterized in that a magnetic field generated in the lead terminal portion is canceled between the lead terminal portions on the same polarity side. The electrolytic capacitor of claim 1,
An electrolytic capacitor, wherein a distance between the lead terminal portions on the same polarity side is larger than a distance between adjacent lead terminal portions on the different polarity side. The electrolytic capacitor of claim 1,
The first lead terminal portion on the anode side and the cathode side is installed adjacent to each other, the second lead terminal portion on the anode side is installed on the first lead terminal portion side on the anode side, and the first lead terminal portion on the cathode side is installed. An electrolytic capacitor comprising: a cathode-side second lead terminal portion disposed on the lead terminal portion side, and the first and second lead terminal portions arranged in a straight line on the element end face. A case enclosing a capacitor element;
A plurality of external terminal portions that are connected to a sealing member for sealing the case or the capacitor element installed in the case, and arranged adjacent to the same polarity side of the anode side or the cathode side, and
An electrolytic capacitor characterized in that a magnetic field is canceled between the same polarities of the external terminal portions. The electrolytic capacitor of claim 4,
An electrolytic capacitor characterized in that a distance between the external terminal portions on the same polarity side is larger than a distance between adjacent external terminal portions on the different polarity side. The electrolytic capacitor of claim 4,
The first external terminal portion on the anode side and the cathode side are installed adjacent to each other, the second external terminal portion on the anode side is installed on the first external terminal portion side on the anode side, and the first external terminal portion on the cathode side is installed. The electrolytic capacitor is characterized in that a second external terminal portion on the cathode side is installed on the external terminal portion side, and the first and second external terminal portions are arranged in a straight line on the element end face. The electrolytic capacitor according to claim 1, 2, 3, 4, 5 or 6.
An electrolytic capacitor comprising a solid electrolyte obtained by chemically polymerizing thiophene or a derivative thereof in the capacitor element. The electrolytic capacitor of claim 7,
The electrolytic capacitor, wherein the thiophene derivative is 3,4-ethylenedioxythiophene. The electrolytic capacitor of claim 7,
The electrolytic capacitor, wherein the solid electrolyte is a TCNQ complex. The electrolytic capacitor of claim 4,
The electrolytic capacitor, wherein the sealing member is an airtight resin.

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