JP2008147541A - Capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitor for reducing an ESL. <P>SOLUTION: This capacitor includes: a first electrode leading-out part 15 connected to a first electrode on one end face of a capacitor element; a first terminal 19 connected to the first electrode leading-out part 15 so as to be derived; a second electrode leading-out part 20 connected to a second electrode on the other end face of the capacitor element; a conductor 21 for covering the outer peripheral side face of the capacitor element connected to the second electrode leading-out part 20 at the other end; and a second terminal 26 connected to one end of the conductor 21 connected to the second electrode leading-out part 20 so as to be derived. The second terminal 26 is derived to the same direction as the deriving direction of the first terminal 19, and currents flowing through the conductor 21 are made equal to a reverse direction to currents flowing through the capacitor element. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a capacitor used in various electronic devices.

  With the recent digitization of electronic devices, there has been a demand for a capacitor having a low equivalent series inductance (hereinafter referred to as ESL) in addition to a reduction in equivalent series resistance (hereinafter referred to as ESR) in a high frequency region.

  Conventionally, this type of capacitor has a configuration as shown in the perspective view of FIG.

  In FIG. 20, this capacitor includes a capacitor element in which a first electrode and a second electrode are wound via a dielectric, and a first electrode lead-out portion 1 connected to the first electrode at one end face of the capacitor element. The first terminal 5 connected to the first electrode lead-out portion 1 and led out, the insulating film 3 covering the outer peripheral side surface of the capacitor element, and the other end face of the capacitor element connected to the second electrode. A second electrode lead portion 2; a conductor 4 made of a metal that covers the outer peripheral side surface of the capacitor element with an insulating film 3 and is connected to the second electrode lead portion 2 at the other end; and the second electrode lead portion. A second terminal 6 connected to one end of the conductor 4 connected to the portion 2 and an insulator 7 provided between the first terminal 5 and the second terminal 6. The first terminal 5 and the second terminal 6 The film capacitor is configured to be drawn in the same direction through the insulator 7 and the conductor 4 is made of a conductive metal covering the outer peripheral side surface of the capacitor element. Almost the same area can be secured as a current path, and the second terminal 6 connected to one end of the conductor 4 is connected to the first electrode lead portion 1 in the same direction as the first terminal 5 derived. Since the current flowing through the conductor 4 flows in the opposite direction to the current flowing through the capacitor element itself, it can contribute to the reduction of ESL by canceling out the magnetic fields. In particular, a current having a high frequency passes through the vicinity of the outer peripheral side surface of the capacitor element, and the conductor 4 made of metal covering the outer peripheral side surface of the capacitor element is used. Since the electric conductor 4 and the outer peripheral side surface of the capacitor element are close to each other, the path of the current flowing through the capacitor element itself and the path of the current flowing through the conductor 4 covering the outer peripheral side surface of the capacitor element can be brought closer to the shortest distance, It is said that the magnetic fields of each other can be canceled efficiently and contribute to the reduction of ESL.

For example, Patent Document 1 and Patent Document 2 are known as prior art documents related to the present invention.
JP 2000-77268 A JP-A-9-232183

  However, in this configuration, the second terminal 6 connected to one end of the conductor 4 made of metal covering the outer peripheral side surface of the capacitor element is drawn out from one place, and the outer peripheral side surface of the capacitor element is covered. The current flowing through the conductor 4 cannot be made to flow evenly over the entire conductor 4, and the current flowing through the capacitor element itself and the magnetic field due to the current flowing through the conductor 4 cannot be effectively canceled out. Has a problem that it cannot be sufficiently reduced.

  The present invention solves the above-mentioned conventional problems, and by equalizing the current flowing through the conductor covering the outer peripheral side surface of the capacitor element to the entire conductor, the magnetic field due to the current flowing through the capacitor element itself and the outer peripheral side surface of the capacitor element are reduced. An object of the present invention is to provide a capacitor in which ESL is further reduced by more effectively canceling out magnetic fields caused by currents flowing in covered conductors.

  In order to achieve the above object, the present invention provides a capacitor element in which a first electrode and a second electrode are wound or laminated via a dielectric layer, and is connected to the first electrode at one end face of the capacitor element. A first electrode lead portion, a first terminal led out integrally or connected to the first electrode lead portion, a second electrode lead portion connected to a second electrode at the other end face of the capacitor element, A conductor that covers the outer peripheral side surface of the capacitor element and is integrated with or connected to the second electrode lead portion at the other end, and one end portion of the conductor that is connected to the second electrode lead portion is integrated or connected A second terminal led out, the second terminal led out in the same direction as the first terminal lead-out direction, and an outer peripheral side surface of the capacitor element with respect to a current flowing between both end faces of the capacitor element Of conductor covering The current flowing through the body in the opposite direction is to provide a structure with a capacitor so as to evenly.

  As described above, according to the present invention, the current flowing between the both end faces of the capacitor element is equalized in the reverse direction by equalizing the current flowing in the entire conductor covering the outer peripheral side surface of the capacitor element. The magnetic field due to the current flowing between both end faces of the capacitor and the magnetic field due to the current flowing through the entire conductor covering the outer peripheral side surface of the capacitor element can be canceled out more efficiently, and the effect of reducing ESL can be obtained.

  In the present invention, a capacitor element in which the first electrode and the second electrode are wound or laminated via a dielectric layer, and a first electrode lead portion connected to the first electrode at one end face of the capacitor element, A first terminal led out integrally or connected to the first electrode lead portion, a second electrode lead portion connected to the second electrode at the other end face of the capacitor element, and an outer peripheral side surface of the capacitor element. A conductor integrally or connected to the second electrode lead-out portion at the other end of the cover, and a second terminal led out integrally or connected to one end of the conductor connected to the second electrode lead-out portion And the second conductor is led out in the same direction as the lead-out direction of the first terminal, and the entire conductor covering the outer peripheral side surface of the capacitor element with respect to the current flowing between both end faces of the capacitor element Current flowing through In the reverse direction configured to be equal.

  As a result, the current flowing between the both end faces of the capacitor element is equalized in the opposite direction with respect to the current flowing between the both end faces of the capacitor element, thereby flowing between the both end faces of the capacitor element. The magnetic field due to the current and the magnetic field due to the current flowing through the entire conductor covering the outer peripheral side surface of the capacitor element can be canceled out more efficiently, and the ESL can be reduced.

  The second terminal is a plurality of protrusions provided at one end of the conductor, and the plurality of protrusions are arranged at equal intervals around the first terminal.

  As a result, by providing a plurality of second terminals around the first terminal at equal intervals, the path of the current flowing through the conductor covering the outer peripheral side surface of the capacitor element can be dispersed and made uniform. The magnetic field due to the current flowing between the two end faces and the magnetic field due to the current flowing through the entire conductor covering the outer peripheral side surface of the capacitor element can be canceled out more efficiently, and ESL can be reduced. .

  In addition, a plurality of the second terminals may be connected to one end of the conductor via a conductive coupling body, and arranged at equal intervals around the first terminal. By using the conductive coupling body provided at intervals, the workability can be facilitated as compared to the case where the plurality of second terminals are directly connected to one end of the conductor. Play.

  In addition, a portion having a higher conductivity than the conductor is provided on substantially the entire circumference of at least one end of the conductor, and the second terminal is connected to the portion having the higher conductivity.

  As a result, since there is a portion having a higher conductivity than the conductor on almost the entire circumference of one end of the conductor, the path of the current flowing through the conductor can be dispersed and equalized. There is no need to provide a plurality of terminals at equal intervals around the first terminal, and if at least one second terminal is used, the magnetic field caused by the current flowing between both end faces of the capacitor element and the outer peripheral side surface of the capacitor element are covered. The magnetic fields caused by the currents flowing through the entire conductor can be canceled out more efficiently, and the ESL can be reduced.

  Moreover, the number of parts of the second terminal can be reduced, and the workability can be improved.

  Moreover, it is good also as a structure which connected the cyclic | annular conductor as a part which has a higher electrical conductivity than the other part of the said conductor, and provided the 2nd terminal in this cyclic | annular conductor, and the cyclic | annular conductor previously provided with the 2nd terminal Is connected to substantially the entire circumference of at least one end of the conductor, so that a portion having higher conductivity than the conductor can be easily provided, and the workability can be improved.

  Further, a portion having high conductivity is provided on the entire surface of the conductor or in a stripe shape from one end portion to the other end portion of the conductor.

  This makes it possible to equalize the current flowing through the conductor more stably than the case where a portion having a high conductivity is provided only on almost the entire circumference of one end of the conductor. There is an effect that it can be reduced.

  In addition, a plane portion is provided in a portion where the first terminal and the second terminal are in contact with the circuit board, and these are arranged on the same plane.

  As a result, it is possible to obtain a low ESL capacitor that can be easily surface-mounted on a circuit board only by processing the lead terminal portion without using additional components.

  Further, an insulating terminal plate is brought into contact with the side from which the first terminal and the second terminal are led out, and the first terminal and the second terminal are fitted into a groove provided on the surface of the terminal plate that contacts the circuit board. And are arranged on the same plane.

  As a result, the parallelism of the lead terminals can be easily obtained by fitting the first lead terminal and the second lead terminal into the groove provided in the terminal plate, and a low ESL capacitor that can be easily surface-mounted on the circuit board is obtained. There is an effect that can be.

  Further, the first electrode and the second electrode made of metal foil are wound or laminated via a dielectric layer provided on the surface of at least one of the electrodes and a separator, and the first electrode is formed from one end of the separator. A capacitor element in which a part of the electrode is protruded and a part of the second electrode is protruded from the other opposite end, and a part of the first electrode is protruded from one end of the separator. A first electrode lead part connected to the part, a first terminal led out integrally or connected to the first electrode lead part, and a part of the second electrode protruding from the other end of the separator A bottomed cylindrical conductive case containing the capacitor element as a second electrode lead portion connected to the portion and the outer peripheral side surface as a conductor covering the outer peripheral side of the capacitor element, and housed in this case Conde The case opening is sealed with a liquid or solid electrolyte interposed between the first electrode and the second electrode of the first element and a through-hole through which a part of the first electrode lead portion or the first terminal is inserted. And a second terminal connected to the case opening, the second terminal being led out in the same direction as the leading direction of the first terminal, and a current flowing between both end faces of the capacitor element On the other hand, the current flowing through the entire outer peripheral side surface of the conductive case covering the outer peripheral side surface of the capacitor element is configured to be equal in the reverse direction.

  As a result, when the conductive bottomed cylindrical case is applied as an exterior material for a capacitor element, the bottom inner surface and the side surface of the case can be applied as the second electrode lead portion and the conductor, respectively. Since the connection step between the two-electrode lead portion and the conductor can be omitted, production control can be reduced, and the number of parts used can be reduced.

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

(Example 1)
1 is a sectional view of a capacitor according to the first embodiment of the present invention, FIG. 2 is a perspective view of the capacitor according to the first embodiment, FIG. 3 is a development view of the capacitor element of the capacitor according to the first embodiment, and FIG. FIG. 5 is an external view of the inner surface of the case bottom of the capacitor in the same embodiment, and FIG. 6 is a capacitor in the same embodiment of the present invention. It is the perspective view which connected the 1st electrode extraction part of this and the 1st terminal.

  1 and 2, an oxide film dielectric having an anode foil 11 as a first electrode and a cathode foil 12 as a second electrode made of a foil of a valve metal such as aluminum is provided on the surface of the anode foil 11. A body layer (not shown) and the separator 13 are wound in a roll shape, a part of the anode foil 11 is projected from one end of the separator 13, and the cathode foil 12 is Capacitor element 14 having a part projecting, and a part of anode foil 11 projecting from one end of separator 13 and a metal such as aluminum or aluminum alloy connected on the other surface From a circular flat plate-like first electrode lead-out portion 15, a first terminal 19 connected and led to a projection 16 provided on one surface of the first electrode lead-out portion 15, and the other end of the separator 13 shadow The bottom electrode inner surface portion connected to the protruding portion of the foil 12 is the second electrode lead portion 20, and the outer peripheral side surface portion is the conductor 21 that covers the outer peripheral side surface of the capacitor element 14. And a conductor 21 and a bottomed cylindrical conductive case 23 in which the capacitor element 14 is accommodated, and between the anode foil 11 and the cathode foil 12 of the capacitor element 14 accommodated in the case 23. A sealing body that includes a driving electrolyte solution (not shown) including an intervening electrolyte and a through hole 25 through which the protrusion 16 provided in the first electrode lead-out portion 15 is inserted, and which seals the opening 22 of the case 23. 24 and a plurality of second terminals 26 equally connected to the opening 22 of the case 23 so as to surround the first terminal 19.

  Moreover, the anode foil 11 of the first electrode is made of a valve metal foil such as aluminum, and its surface is etched to increase the surface area, and further subjected to electrochemical treatment to form an oxide film as a dielectric layer. The cathode foil 12 of the second electrode is etched on the surface using a valve metal foil such as aluminum.

  The separator 13 is made of cellulose fiber such as manila paper or synthetic resin fiber such as polyester.

  The capacitor element 14 is formed by winding the anode foil 11 of the first electrode, the cathode foil 12 of the second electrode 12 and the separator 13 into a roll shape, but the anode foil 11 of the first electrode and the second electrode A plurality of sheets may be alternately laminated on the cathode foil 12 with the separators 13 interposed therebetween.

  The case 23 has a conductive bottomed cylindrical shape made of a uniform metal member such as aluminum or an aluminum alloy, and both end surfaces of the accommodated capacitor element 14 are arranged in parallel with each other. 20 is electrically connected to the bottom inner surface portion of the case 23 and the other surface of the first electrode lead portion 15, and the other surface of the first electrode lead portion 15 is the second electrode lead portion 20. The case 23 is pressed and brought into contact with the bottom inner surface portion.

  Further, as shown in FIG. 6, the protrusion 16 and the first terminal 19 are made of a single metal such as aluminum, nickel, iron, copper, or an alloy, and a welding method using resistance welding, arc welding, laser welding, They are connected and connected by a crimping method using caulking or the like.

  The first terminal 19 and the second terminal 26 are composed of conductive materials such as plate, wire, or block metal, and are generally used for electrical connection with a circuit board, such as Sn. The metal layer may be provided by surface treatment using an Sn alloy or the like, or may be provided with screws or the like that are fixed to the circuit board.

  A plurality of first terminals 19 may be provided. In this case, a plurality of first terminals 19 connected to and led out from the first electrode lead-out portion 15 are respectively provided in the plurality of through holes 25 provided in the sealing body 24. It is inserted.

  The sealing body 24 is made of an elastic insulating resin mainly composed of butyl rubber or the like, or an insulating resin using a thermoplastic resin such as polyester, or a thermosetting resin such as phenol or epoxy resin. The opening 22 of the case 23 is hermetically sealed by, for example, drawing the outer surface of the opening 22 of the case 23.

  In addition, the electrolyte interposed between the anode foil 11 and the cathode foil 12 of the capacitor element 14 accommodated in the case 23 is filled with the driving electrolyte impregnated in the capacitor element 14 or the capacitor element 14. It is formed by polymerizing a solid electrolyte such as a conductive polymer.

  The opening 22 of the case 23 is sealed by winding a sealing body 24 made of an elastic body such as rubber from the outer peripheral side surface of the case 23, particularly when enclosing a liquid electrolyte.

  Next, a method for manufacturing a capacitor in Example 1 of the present invention will be described with reference to FIGS.

  First, the anode foil 11, the cathode foil 12 and the separator 13 having a dielectric layer of an oxide film on the surface were cut into a certain width and length, and as shown in FIG. A separator 13 is interposed, and a part of the anode foil 11 is protruded from one end of the separator 13 and a part of the cathode foil 12 is protruded from the opposite end. The capacitor element 14 is formed by winding and fixing the outer peripheral side surface with an insulating tape.

  On the other hand, the projection 16 provided in advance on one surface of the first electrode lead portion 15 is connected to the first terminal 19, and the first terminal 19 is inserted into the through-hole 25 provided in the sealing body 24 to be the first. The electrode lead portion 15 and the sealing body 24 are fitted together. Note that the connecting portion between the protrusion 16 and the first terminal 19 may be fitted together. Further, after the protrusion 16 of the first electrode lead-out portion 15 is inserted into the through hole 25 of the sealing body 24 and the first electrode lead-out portion 15 and the sealing body 24 are fitted together, the first terminal 19 is connected to the first electrode lead-out portion. You may connect to the 15 protrusion parts 16. FIG.

  Next, the capacitor element 14 is inserted into the case 23, and the other surface of the first electrode lead portion 15 is pressed against one end face from which a part of the anode foil 11 of the capacitor element 14 protrudes to pressurize the capacitor element 14. The other end face from which part of the cathode foil 12 of the capacitor element 14 protrudes, the bottom inner surface part of the case 23 which is the second electrode lead-out part 20, and the one end face from which part of the anode foil 11 of the capacitor element 14 protrudes. And the other surface of the first electrode lead portion 15 are brought into contact with each other.

  Further, the case 23 is filled with a driving electrolyte containing an electrolyte, the capacitor element 1 is impregnated with the driving electrolyte, and then the sealing body 24 is wound from the outer peripheral side surface of the case 23 to thereby close the case 23. The opening 22 is sealed.

  Thereafter, a plurality of second terminals 26 were connected to the opening 22 of the case 23 at equal intervals so as to surround the first terminal 19 to produce a capacitor. A plurality of protrusions integrated with the case 23 may be formed in a part of the opening 22 of the case 23 that is one end of the conductor 21, and these may be used as the plurality of second terminals 26. .

  With the configuration and the manufacturing method as described above, the outer peripheral side surface portion of the case 23 covering the outer peripheral side surface of the capacitor element 14 is used as the conductor 21, and the opening 22 of the case 23, which is one end portion of the conductor 21, is first. Since the plurality of second terminals 26 are connected at equal intervals so as to surround the terminal 19, the conductor 21 that covers the outer peripheral side surface of the capacitor element 14 against the current flowing between the both end faces of the capacitor element 14 is used. The current flowing through the entire outer peripheral side surface of a case 23 can be made equal in the opposite direction, and the entire conductor 21 covering the magnetic field caused by the current flowing between both end surfaces of the capacitor element 14 and the outer peripheral side surface of the capacitor element 14. Can effectively cancel each other out of the magnetic field caused by the currents flowing through them, and the effect of reducing ESL can be obtained.

  When the conductive bottomed cylindrical case 23 is applied as an exterior material for the capacitor element 14, the bottom inner surface portion and the outer peripheral side surface portion of the case 23 are used as the second electrode lead portion 20 and the conductor 21, respectively. It can be applied, and the connection process between the second electrode lead portion 20 and the conductor 21 can be omitted, so that the production management can be reduced and the number of parts used can be reduced.

  Also, as shown in FIGS. 4 and 5, convex portions 27 are provided radially from the center on the other surface of the first electrode lead portion 15 and / or the bottom inner surface portion of the case 23 that is the second electrode lead portion 20. The convex portions 28 may be provided radially from the center. By providing the convex portions 27 and 28, when the pressure is applied from both end surfaces of the capacitor element 14, the load on the convex portions 27 and 28 is increased. Therefore, the anode foil 11 of the first electrode and the first electrode lead portion 15 are provided. Of the second electrode and the cathode foil 12 of the second electrode and the bottom inner surface portion of the case 23 which is the second electrode lead-out portion 20 can be more firmly and stably connected, and the electrical connection resistance can be reduced. The ESR can be reduced, and the current path in the capacitor element 14 can be evenly distributed.

  The convex portions 27 and 28 are formed by raising the other surface of the first electrode lead portion 15 and the bottom inner surface portion of the case 23 that is the second electrode lead portion 20, or a linear conductor. It may be formed by bonding.

  Further, the other surface of the first electrode lead-out portion 15 and the bottom inner surface portion of the case 23 that is the second electrode lead-out portion 20 are heated by using a laser or the like, respectively, and the anode foil 11 of the first electrode and the second electrode lead-out portion 20 respectively. The two-electrode cathode foil 12 may be joined by welding.

(Example 2)
FIG. 7 is a perspective view of a capacitor in the second embodiment, FIG. 8 is a perspective view of a conductive connecting body in which a plurality of second terminals of the capacitor in the second embodiment are connected, and FIG. 9 is another example of the capacitor in the second embodiment. FIG.

  In addition, about what has the structure similar to the structure of Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  7 and 8, the difference from the first embodiment is that a plurality of second terminals 26 are connected to the opening 22 of the case 23, which is one end of the conductor 21, via the conductive coupling body 29. The point is that the terminals are evenly connected so as to surround the one terminal 19.

  Further, if a connecting member 29 having a spring property such as a metal is used and a shape having a cut in a part of the connecting member 29 is used, the connecting member 29 can be easily fitted into the opening 22 of the case 23.

  In the configuration as described above, the case where the plurality of second terminals 26 are one end portion of the conductor 21 is obtained by using the conductive connecting body 29 in which the plurality of second terminals 26 are previously provided at equal intervals. As compared with the case of directly connecting to the opening 22, the workability can be facilitated.

  Moreover, it is good also as a structure which provided the plane parts 19a and 26a in the part which touches the circuit board of the said 1st terminal 19 and the 2nd terminal 26, respectively, and has arrange | positioned these on the same plane.

  In addition, these plane parts 19a and 26a are provided by making the shape of the 1st terminal 19 and the 2nd terminal 26 into a block shape, or bending.

  As a result, it is possible to obtain a low ESL capacitor that can be easily surface-mounted on a circuit board only by processing the lead terminal portion without using other components.

  Further, as shown in FIG. 9, the flat portion 15 a provided on the side of the first electrode lead portion 15 facing the sealing body 24 and the flange portion 19 b provided at the base of the first terminal 19 led out from the sealing body 24. May be sandwiched between the sealing body 24 and the capacitor 24 so that the surface temperature of the capacitor becomes a high ambient temperature of about 220 ° C. to 260 ° C. when soldered by a reflow method. As the internal pressure rises, a force that warps the sealing body 23 to the outside is applied. On the other hand, the sealing body 24 made of an elastic body such as rubber is sandwiched between the flat surface portion 15a and the flange portion 19b to increase the strength of the sealing body 24. And high temperature heat resistance such as reflow can be improved.

(Example 3)
10 is a cross-sectional view of a capacitor according to a third embodiment of the present invention, FIG. 11 is a perspective view of the capacitor according to the same embodiment, FIG. 12 is a cross-sectional view illustrating another example of the capacitor according to the same embodiment, and FIG. FIG. 14 is a perspective view showing another example of the capacitor in FIG. 14, FIG. 14 is an external view of an annular conductor having a second terminal of another example of the capacitor in the same example, and FIG. 15 is another example of the capacitor in the same example. It is sectional drawing shown.

  In addition, about what has the structure similar to the structure of Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIGS. 10 and 11, the difference from the first embodiment is that the annular conductor 30 having higher conductivity than the conductor 21 on almost the entire circumference of the opening 22 of the case 23, which is one end of the conductor 21. Is connected, and one second terminal 26 is connected to the annular conductor 30.

  The annular conductor 30 only needs to have a shape almost in contact with the opening 22 of the case 23 and may have a cut in part.

  In the configuration as described above, since there is a portion having a higher conductivity than the conductor around almost the entire circumference of the opening 22 of the case 23, which is one end of the conductor 21, the path of the current flowing through the conductor 21 Therefore, it is not necessary to provide a plurality of second terminals 26 at equal intervals around the first terminal 19, and if at least one second terminal 19 is used, both ends of the capacitor element are provided. The magnetic field due to the current flowing between the surfaces and the magnetic field due to the current flowing through the entire conductor 21 covering the outer peripheral side surface of the capacitor element can be more effectively canceled out, and ESL can be reduced.

  Moreover, the number of parts of the second terminal can be reduced, and workability can be improved.

  Also, as shown in FIGS. 12 and 13, flat portions 19a and 26a may be provided on portions of the first terminal 19 and the second terminal 26 that are in contact with the circuit board, and these may be arranged on the same plane. .

  The flat portions 19a and 26a of the portions of the first terminal 19 and the second terminal 26 that are in contact with the circuit board are formed by bending the first terminal 19 and the second terminal 26 in a block shape or the like. .

  As a result, it is possible to obtain a low ESL capacitor that can be easily surface-mounted on the circuit board only by processing the lead terminal portion without using other components.

  Further, as shown in FIG. 14, the second terminal 26 is directly connected to the opening 22 of the case 23, which is one end of the conductor 21, by using the annular conductor 30 having the second terminal 26 in advance. Compared with the case where it does, the position alignment of the 1st terminal 19 and the 2nd terminal 26 can be performed easily, and the effect that workability | operativity can be improved can be acquired.

  Further, as shown in FIG. 15, the annular conductor 30 may be provided so that the convex portion 30a is in close contact with the surface of the sealing body 24 made of an elastic body exposed at the opening 22 of the case 23. Due to the fact that the surface temperature of the capacitor becomes a high ambient temperature of about 220 ° C. to 260 ° C. when soldering is performed by a reflow method, a force is applied to warp the sealing body 24 to the outside due to an increase in internal pressure of the capacitor. Since the annular conductor 27 is in close contact with the surface of the sealing body 24 exposed at the opening of the case 22, the strength of the sealing body 24 can be increased and heat resistance at high temperatures such as reflow can be improved. be able to.

  The same effect can be obtained by arranging the second terminal 26 so as to be in close contact with the surface of the sealing body 24 exposed at the opening 22 of the case 23.

Example 4
FIG. 16 is a cross-sectional view of a capacitor according to Embodiment 4 of the present invention, and FIG. 17 is a perspective view illustrating another example of the capacitor according to the embodiment.

  In addition, about what has the structure similar to the structure of Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 16, the difference from Example 1 is that, as shown in FIG. 16, the bottomed cylindrical conductive case 23 is composed of two or more layers of materials having different conductivity, and the material of the outermost layer. The case 23 having the two or more layers having different conductivity is made of a material having a higher conductivity than the material used for the other layers in the outermost layer. These layers are integrated by plating, coating, vapor deposition, and the like. Specifically, the inner layer 31 is plated with an aluminum member, and the outer layer 41 is plated with copper, silver, or a gold member having higher conductivity than the aluminum member. A case 23 composed of layers is used, and the second terminal 26 is directly connected to the outer layer 41 through the opening 22 of the case 23.

  In addition, as shown in FIG. 17, a plated portion 51 having higher conductivity than the conductor 21 is provided from one end portion of the conductor 21 to the other end portion, and the plated portion 51 is the conductor 21. The case 23 may be evenly provided in stripes on the outer peripheral side surface portion.

  In the configuration as described above, not only the opening 22 of the case 23 that is one end of the conductor 21, but also a portion having high conductivity from one end of the conductor 21 to the other end is provided as the conductor. By providing evenly on the outer peripheral side surface of 21, current flowing through the entire conductor 21 can be more stably equalized than when a portion having high conductivity is provided only at one end of the conductor 21. And ESL can be reduced.

  In addition, since the portion having high conductivity is provided integrally with the case 23, it is not necessary to separately attach the portion having high conductivity, and the effect of facilitating workability can be obtained.

  If the second terminal 26 is made of copper or iron as a base and plated with tin (Sn), zinc (Zn), or gold (Au) having excellent solder wettability, the bondability to the case 23 is achieved. Thus, the bonding reliability of the second terminal 26 can be improved.

(Example 5)
FIG. 18 is a perspective view of a capacitor according to the fifth embodiment of the present invention, and FIG. 19 is a perspective view illustrating another example of the capacitor according to the fifth embodiment.

  In addition, about what has the structure similar to the structure of Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 18, the first embodiment is different from the first embodiment in that the first terminal 19 and the second terminal 26 are in contact with the lead-out side, and an insulating terminal plate 32 is provided. A groove portion 39 into which the bent first terminal 19 is inserted and bent through the terminal plate 32 and a groove portion 36 into which the bent second terminal 26 is inserted and bent into the side surface of the terminal plate 32 are formed on the surface in contact with the substrate. It is the point which is set as the provided structure.

  The terminal board 32 is made of heat-resistant synthetic resin such as PPS (polyphenylene sulfide) or liquid crystal polymer.

  Further, the shape of the first terminal 19 and the second terminal 26 fitted into the groove portions 39 and 36, respectively, can be a plate shape or a line shape, and the shape of the groove portions 39 and 36 conforms to this terminal shape. It is formed as follows.

  With the above configuration, the parallelism of the first terminal 19 and the second terminal 25 can be easily obtained by fitting the first terminal 19 and the second terminal 26 into the groove portions 39 and 36 provided in the terminal plate 32, respectively. It is possible to obtain a low ESL capacitor that can be easily surface-mounted on a substrate.

  When the capacitor has polarity, the polarities of the first terminal 19 connected to the anode foil 11 and led out to the outside and the second terminal 26 connected to the cathode foil 12 and led out to the outside are connected to the second terminal 26. By providing the chamfered portion 35 on the side where the one terminal 19 is bent, the polarity can be determined on the appearance of the capacitor.

  Further, as shown in FIG. 19, when a plurality of second terminals 26 are provided, the groove portion 36 is provided in the terminal plate 32 according to the number of terminals, and when a plurality of first terminals 19 are provided, the number of terminals is also adjusted. A groove 39 is provided in the terminal plate 32.

  The present invention can be applied to capacitors used in various electronic devices.

Sectional drawing of the capacitor in Example 1 of the present invention The perspective view of the capacitor in Example 1 of the present invention FIG. 3 is a development view of the capacitor element of the capacitor in Example 1 of the present invention. 1 is an external view of a first electrode lead portion of a capacitor in Embodiment 1 of the present invention (side connected to one end face of a capacitor element). External view of the inner surface of the case bottom of the capacitor in Example 1 of the present invention (side connected to the other end surface of the capacitor element) The perspective view which connected the 1st electrode drawer | drawing-out part and 1st terminal of the capacitor | condenser in Example 1 of this invention. The perspective view of the capacitor in Example 2 of the present invention The perspective view of the electroconductive coupling body which connected the some 2nd terminal of the capacitor | condenser in Example 2 of this invention. Sectional drawing of the other example of the capacitor | condenser in Example 2 of this invention Sectional drawing of the capacitor in Example 3 of the present invention The perspective view of the capacitor in Example 3 of the present invention Sectional drawing which shows the other example of the capacitor | condenser in Example 3 of this invention The perspective view which shows the other example of the capacitor | condenser in Example 3 of this invention External view of the annular conductor having the second terminal of another example of the capacitor according to the third embodiment of the present invention. Sectional drawing which shows the other example of the capacitor | condenser in Example 3 of this invention Sectional drawing of the capacitor in Example 4 of the present invention The perspective view which shows the other example of the capacitor | condenser in Example 4 of this invention The perspective view seen from the mounting surface to the circuit board of the capacitor in Example 5 of the present invention The perspective view seen from the mounting surface to the circuit board of the other example of the capacitor in Example 5 of the present invention A perspective view of a conventional film capacitor

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Anode foil 12 Cathode foil 13 Separator 14 Capacitor element 15 1st electrode drawer | drawing-out part 15a Plane part 16 Protrusion part 19 1st terminal 19a Plane part 19b Eaves part 20 2nd electrode drawer part 21 Conductor 22 Opening part 23 Case 24 Sealing body 25 through-hole 26 second terminal 26a flat surface portion 27 convex portion 28 convex portion 29 coupling body 30 annular conductor 30a convex portion 31 inner layer 32 terminal plate 35 chamfered portion 36 groove portion 39 groove portion 41 outer layer 51 plated portion

Claims (9)

A capacitor element obtained by winding or laminating a first electrode and a second electrode via a dielectric layer, a first electrode lead portion connected to the first electrode at one end face of the capacitor element, and the first electrode A first terminal led out integrally or connected to the lead part; a second electrode lead part connected to the second electrode at the other end face of the capacitor element; and the other end part covering the outer peripheral side surface of the capacitor element A conductor integrated or connected to the second electrode lead-out portion, and a second terminal led out integrally or connected to one end of the conductor connected to the second electrode lead-out portion, The second terminal is led out in the same direction as the lead-out direction of the first terminal, and the current flowing in the entire conductor covering the outer peripheral side surface of the capacitor element is reversed with respect to the current flowing between both end faces of the capacitor element. Equal in direction Configured capacitor so. The capacitor according to claim 1, wherein the second terminal is a plurality of protrusions provided at one end of the conductor, and the plurality of protrusions are arranged at equal intervals around the first terminal. The capacitor according to claim 2, wherein a plurality of the second terminals are connected to one end portion of the conductor via a conductive coupling body, and are arranged at equal intervals around the first terminal. 2. The capacitor according to claim 1, wherein a portion having a higher conductivity than the conductor is provided on substantially the entire circumference of at least one end of the conductor, and the second terminal is connected to the portion having the higher conductivity. The capacitor according to claim 4, wherein an annular conductor is connected as a part having higher conductivity than the other part of the conductor, and a second terminal is provided on the annular conductor. The capacitor according to claim 1, wherein a portion having a high conductivity is provided on the entire surface of the conductor or in a stripe shape from one end portion to the other end portion of the conductor. 2. The capacitor according to claim 1, wherein a planar portion is provided in a portion of the first terminal and the second terminal contacting the circuit board, and these are arranged on the same plane. An insulating terminal plate is brought into contact with the side from which the first terminal and the second terminal are led out, and the first terminal and the second terminal are fitted into a groove provided on a surface of the terminal plate in contact with the circuit board. The capacitor according to claim 1, which is disposed on the same plane. The first electrode and the second electrode made of metal foil are wound or laminated via a separator and a dielectric layer provided on the surface of at least one of the electrodes, and the first electrode is formed from one end of the separator. A capacitor element that protrudes partly and protrudes a part of the second electrode from the other opposite end part, and a part that protrudes a part of the first electrode from one end part of the separator; A connected first electrode lead portion, a first terminal that is integrated with or connected to the first electrode lead portion, and a portion in which a part of the second electrode protrudes from the other end of the separator; A bottomed cylindrical conductive case containing the capacitor element with the connected bottom inner surface portion as the second electrode lead-out portion and the outer peripheral side portion as the conductor covering the outer peripheral side surface of the capacitor element, and stored in this case Capacitor element A liquid or solid electrolyte interposed between the first electrode and the second electrode and a through hole through which a part of the first electrode lead portion or the first terminal is inserted to seal the case opening Body and a second terminal connected to the case opening, and the second terminal is led out in the same direction as the lead-out direction of the first terminal, and the current flowing between both end faces of the capacitor element A capacitor configured to equalize current flowing in the entire outer peripheral side surface of the conductive case covering the outer peripheral side surface of the capacitor element in the opposite direction.

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