JP2011146548A - Solid electrolytic capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid electrolytic capacitor simply manufacturing a cathode terminal and reducing the manufacturing cost and the material cost. <P>SOLUTION: In the solid electrolytic capacitor, an anode terminal 3 and the cathode terminal 4 include an anode-terminal surface 30 and a cathode-terminal surface 40, exposed to the underside 20 of a sheathing resin 2 and electrically separated mutually, respectively. The cathode terminal 4 includes a first cathode-terminal configuration 41 forming the cathode-terminal surface 40; and a second cathode-terminal configuration 42, extended in an inverted L-shape from the first cathode-terminal configuration 41 in the sheathing resin 2 and directing a front end 421 toward the anode terminal 3, in this case; the cathode terminal 4 further includes a third cathode-terminal configuration 43 being extended in the inverted L-shape from the first cathode-terminal configuration 41 in the sheathing resin 2 and directing the front end 431 towards the reverse side to the anode terminal 3; and the second cathode-terminal configuration 42 and the third cathode-terminal configuration 43 are connected electrically in a cathode for a capacitor element 1 on the underside 10 of the capacitor element 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solid electrolytic capacitor having an anode terminal and a cathode terminal.

  This type of solid electrolytic capacitor includes a solid electrolytic capacitor element in which a dielectric layer is interposed between an anode part and a cathode part, and an exterior resin covering the capacitor element, and an anode terminal is provided in the exterior resin. And a cathode terminal are embedded. Conventionally, the cathode terminal is formed with a raised portion that protrudes from a part of the lower surface thereof, and the tip surface of the raised portion is exposed on the lower surface of the exterior resin, and the cathode terminal surface is exposed by the tip surface of the raised portion. (For example, refer to Patent Document 1).

  Conventionally, in order to reduce the inductance of the solid electrolytic capacitor, it has been proposed to form the raised portion in a region near the anode terminal in the lower surface of the cathode terminal (see, for example, Patent Document 2).

JP 2001-110676 A JP 2004-349270 A

  However, in the conventional solid electrolytic capacitor, the raised portion is formed by cutting (for example, sputtering or etching) a single metal plate serving as a cathode terminal. For this reason, the production of the solid electrolytic capacitor is complicated and the production cost is high. Furthermore, it is necessary to use a metal plate having a large thickness dimension, and thus the material cost is high.

  Accordingly, an object of the present invention is to provide a solid electrolytic capacitor in which the production of a cathode terminal is simple and the production cost and material cost are low.

  A solid electrolytic capacitor according to the present invention includes a solid electrolytic capacitor element having an anode part, a cathode part, and a dielectric layer, an exterior resin covering the capacitor element, and an embedded resin embedded in the exterior resin. An anode terminal electrically connected to the anode part; and a cathode terminal embedded in the exterior resin and electrically connected to the cathode part of the capacitor element, each of the anode terminal and the cathode terminal being the exterior It has an anode terminal surface and a cathode terminal surface exposed on the lower surface of the resin and electrically separated from each other. Here, the cathode terminal includes a first cathode terminal constituent part that forms the cathode terminal surface, and an inverted L-shape extending from the first cathode terminal constituent part in the exterior resin so that a tip part is directed to the anode terminal. A second cathode terminal component, and a third cathode terminal component extending in an inverted L shape from the first cathode terminal component in the exterior resin and having a tip directed to the side opposite to the anode terminal, And the second cathode terminal component and the third cathode terminal component are electrically connected to the cathode portion of the capacitor element on the lower surface of the capacitor element.

  According to the solid electrolytic capacitor, the cathode terminal can be formed by bending and deforming one metal plate. Accordingly, the solid electrolytic capacitor according to the present invention is easier to manufacture than the conventional solid electrolytic capacitor in which a cathode terminal is formed by cutting a single metal plate having a large thickness. Also, the manufacturing cost is low. Furthermore, since the cathode terminal can be formed using a metal plate having a small thickness compared to a conventional solid electrolytic capacitor, the material cost is reduced.

  In addition, an electrical path is formed between the anode terminal surface and the cathode terminal surface via a capacitor element. Here, in the solid electrolytic capacitor, the cathode terminal surface can be disposed close to the anode terminal surface. According to the configuration of the solid electrolytic capacitor, the lower surface of the capacitor element (the lower surface of the cathode portion). The second cathode terminal component is electrically connected in a region closer to the anode portion of the capacitor element than the region facing the first cathode terminal component (that is, the region facing the cathode terminal surface). It will be. For this reason, in the said solid electrolytic capacitor, the said path | route can be shortened compared with the conventional solid electrolytic capacitor, Therefore It is possible to make the inductance between an anode terminal surface and a cathode terminal surface small.

  By the way, in the solid electrolytic capacitor, the first cathode terminal constituent portion of the cathode terminal is disposed away from the lower surface of the capacitor element (the lower surface of the cathode portion). Therefore, the connection area between the cathode terminal and the cathode part of the capacitor element is reduced by the area of the area facing the first cathode terminal constituent part in the lower surface of the capacitor element. However, in the solid electrolytic capacitor, the second cathode terminal component and the third cathode terminal component are connected over a wide range to the cathode part of the capacitor element on the lower surface of the capacitor element. Therefore, it is possible to suppress a reduction in the connection area between the cathode terminal and the cathode portion of the capacitor element.

  In the specific configuration of the solid electrolytic capacitor, the second cathode terminal constituent portion extends in an inverted L shape from the region on the anode terminal side in the outer peripheral edge of the first cathode terminal constituent portion, but is opposite to the anode terminal. The third cathode terminal component extends in an inverted L shape from the side region.

  In a more specific configuration of the solid electrolytic capacitor, the length dimension of the second cathode terminal component is smaller than the length dimension of the third cathode terminal component in the direction from the anode terminal to the cathode terminal.

  According to the specific configuration, the connection area between the cathode terminal and the cathode portion of the capacitor element is reduced by increasing the length dimension of the third cathode terminal configuration portion while decreasing the length dimension of the second cathode terminal configuration portion. The cathode terminal surface can be brought close to the anode terminal surface with almost no change. Therefore, the electrical path between the anode terminal surface and the cathode terminal surface is shortened, and as a result, the inductance between the both terminal surfaces is reduced.

  In another specific configuration of the solid electrolytic capacitor, the anode terminal has a first anode terminal component that forms the anode terminal surface, and an outer peripheral edge of the first anode terminal component that is opposite to the cathode terminal A second anode terminal constituting portion extending in an inverted L shape in the exterior resin from the side region and having a tip portion directed to the opposite side to the cathode terminal.

  According to the specific configuration described above, in a state where a part of the capacitor element is disposed above the first anode terminal constituent part of the anode terminal, the anode part of the capacitor element is electrically connected to the second anode terminal constituent part of the anode terminal. Can be connected. Therefore, the volume ratio (occupancy ratio) occupied by the capacitor element in the solid electrolytic capacitor can be increased.

  In still another specific configuration of the solid electrolytic capacitor, the solid electrolytic capacitor further includes a third terminal different from the anode terminal and the cathode terminal, and the third terminal is a lower surface of the exterior resin. The third terminal surface is exposed in a region opposite to the exposed region of the anode terminal surface with respect to the exposed region of the cathode terminal surface.

  When mounting a solid electrolytic capacitor having the above specific configuration on a circuit board, the anode terminal surface, the cathode terminal surface, and the third terminal surface are soldered to lands formed on the circuit board. become.

  By the way, in the solid electrolytic capacitor according to the present invention, the cathode terminal surface can be disposed close to the anode terminal surface. When the cathode terminal surface is arranged close to the anode terminal surface, the cathode terminal surface is arranged to be biased toward the anode terminal surface on the lower surface of the exterior resin. Therefore, when only the anode terminal surface and the cathode terminal surface are soldered to the land on the circuit board, only one side portion of the solid electrolytic capacitor is supported on the circuit board. For this reason, when an external force is applied to the solid electrolytic capacitor, the solder portion that fixes the solid electrolytic capacitor to the circuit board is easily broken.

  On the other hand, in the solid electrolytic capacitor having the above specific configuration, the third terminal surface is soldered to the land on the circuit board in addition to the anode terminal surface and the cathode terminal surface. Will be supported. Therefore, even when an external force is applied to the solid electrolytic capacitor, the solder portion is not easily broken. As a result, the solid electrolytic capacitor is firmly fixed on the circuit board by soldering.

  In the solid electrolytic capacitor according to the present invention, the production of the cathode terminal is simple and the production cost and material cost are low.

FIG. 1 is a perspective view showing a solid electrolytic capacitor according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA shown in FIG. FIG. 3 is a perspective view showing the solid electrolytic capacitor shown in FIG. 1 upside down. FIG. 4 is a perspective view for explaining a frame material manufacturing process of the method for manufacturing a solid electrolytic capacitor. FIG. 5 is a perspective view for explaining a frame body forming step of the manufacturing method. FIG. 6 is a perspective view for explaining a mounting process of the manufacturing method. FIG. 7 is a perspective view for explaining an exterior resin forming step of the manufacturing method. FIG. 8 is a perspective view for explaining a cutting step of the manufacturing method. FIG. 9 is a perspective view illustrating a bending step of the manufacturing method.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a perspective view showing a solid electrolytic capacitor according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA shown in FIG. As shown in FIG. 2, the solid electrolytic capacitor of this embodiment includes a solid electrolytic capacitor element (1), an exterior resin (2) covering the capacitor element (1), and an exterior resin (2). An embedded anode terminal (3) and cathode terminal (4) are provided.

  The capacitor element (1) has a dielectric layer (13) formed on the surface of an anode body (11) in which a cylindrical anode lead (12) is planted, and an electrolyte layer on the dielectric layer (13). The cathode layer (15) is formed via (14). Here, the anode body (11) is formed of a porous sintered body made of a valve action metal, and a metal such as tantalum, niobium, titanium, aluminum or the like is used as the valve action metal.

  The anode lead (12) has a base end portion (122) embedded in the anode body (11), and a distal end portion (121) drawn out from the surface of the anode body (11). In addition, planar regions (123) and (124) extending from the tip of the anode lead (12) are formed on the top and bottom surfaces of the tip (121), respectively. The anode lead (12) is formed of the same or different valve action metal as the valve action metal forming the anode body (11), and the anode body (11) and the anode lead (12) are electrically connected to each other. It is connected to the.

  The dielectric layer (13) is composed of an oxide film formed on the surface of the anode body (11), and the oxide film turns the anode body (11) into an electrolytic solution such as a phosphoric acid aqueous solution or an adipic acid aqueous solution. It is formed by dipping and electrochemically oxidizing (anodic oxidation) the surface of the anode body (11).

  The electrolyte layer (14) is formed on the dielectric layer (13) using a material such as a conductive inorganic material such as manganese dioxide, a TCNQ (Tetracyano-quinodimethane) complex salt, a conductive organic material such as a conductive polymer. ing.

  The cathode layer (15) includes a carbon layer (not shown) formed on the electrolyte layer (14) and a silver paste layer (not shown) formed on the carbon layer. 14) and the cathode layer (15) are electrically connected to each other.

  In the capacitor element (1), the tip portion (121) of the anode lead (12) constitutes the anode portion of the capacitor element (1) to which the anode terminal (3) is to be connected, while the cathode layer (15) Thus, the cathode part of the capacitor element (1) to which the cathode terminal (4) is to be connected is constituted.

  FIG. 3 is a perspective view showing the solid electrolytic capacitor shown in FIG. 1 upside down. As shown in FIG. 3, the anode terminal (3) and the cathode terminal (4) are exposed from the lower surface (20) of the exterior resin (2) and are electrically separated from each other, and the anode terminal surface (30) and the cathode terminal, respectively. The anode terminal surface (30) and the cathode terminal surface (40) constitute a pair of lower surface electrodes of the solid electrolytic capacitor.

As shown in FIG. 2, the anode terminal (3) is composed of a first anode terminal component (31) and a second anode terminal component (32). The first anode terminal component (31) is disposed at a position below the capacitor element (1) and is separated from the capacitor element (1), and the lower surface of the first anode terminal component (31) is covered with exterior resin. The anode terminal surface (30) is formed by exposing from the lower surface (20) of (2). The second anode terminal component (32) is formed in an inverted L shape from the region on the opposite side of the outer periphery of the first anode terminal component (31) to the side opposite to the cathode terminal (4). Extending, the tip (321) is directed to the opposite side of the cathode terminal (4).
The anode terminal (3) can be formed by subjecting one metal plate to press working or the like to bend and deform the metal plate.

  Then, the anode part of the capacitor element (1) (the tip part (121) of the anode lead (12)) has a planar area (124) formed on the lower surface thereof, and the second anode terminal constituting part (32). The tip (321) is electrically connected. Thus, the anode terminal (3) is electrically connected to the anode part of the capacitor element (1).

The cathode terminal (4) includes a first cathode terminal component (41), a second cathode terminal component (42), and a third cathode terminal component (43). The first cathode terminal component (41) is disposed at a position below the capacitor element (1) and spaced from the capacitor element (1), and the lower surface of the first cathode terminal component (41) is covered with an exterior resin. The cathode terminal surface (40) is formed by exposing from the lower surface (20) of (2). The second cathode terminal component (42) extends in an inverted L shape from the region on the anode terminal (3) side of the outer periphery of the first cathode terminal component (41) in the exterior resin (2), The tip (421) is directed to the anode terminal (3). The third cathode terminal component (43) is formed in an inverted L shape in the exterior resin (2) from a region on the opposite side of the outer periphery of the first cathode terminal component (41) to the anode terminal (3). Extending, the tip (431) is directed to the opposite side of the anode terminal (3).
The cathode terminal (4) can be formed by subjecting one metal plate to press working or the like to bend and deform the metal plate.

  The cathode portion (cathode layer (15)) of the capacitor element (1) is connected to the tip (421) of the second cathode terminal component (42) on the lower surface (10) of the capacitor element (1). The tip part (431) of the third cathode terminal component (43) is electrically connected. Thus, the cathode terminal (4) is electrically connected to the cathode portion of the capacitor element (1).

  In this embodiment, in the direction (90) from the anode terminal (3) to the cathode terminal (4), the length dimension L1 of the second cathode terminal component (42) is equal to that of the third cathode terminal component (43). It is smaller than the length dimension L2.

  As shown in FIG. 2, the solid electrolytic capacitor of the present embodiment further includes a third terminal (5) different from the anode terminal (3) and the cathode terminal (4). As shown in FIG. 3, the third terminal (5) has an anode terminal surface (30) exposed to an exposed region of the cathode terminal surface (40) in the lower surface (20) of the exterior resin (2). It has the 3rd terminal surface (50) exposed to the area | region on the opposite side to an area | region.

Next, a method for manufacturing the solid electrolytic capacitor will be described.
FIG. 4 is a perspective view for explaining a frame material manufacturing process of the method for manufacturing a solid electrolytic capacitor. As shown in FIG. 4, in the frame material manufacturing step, the metal plate material (60) is punched to manufacture the frame material (61).

  Here, the frame material (61) includes an anode frame (71) serving as an anode terminal (3), a cathode frame (72) serving as a cathode terminal (4), and a third terminal serving as a third terminal (5). The frame (73) is formed. Further, the anode frame (71) includes a first anode frame portion (711) serving as a first anode terminal constituting portion (31) and a second anode frame portion (712) serving as a second anode terminal constituting portion (32). And are formed. The cathode frame (72) includes a first cathode frame portion (721) serving as a first cathode terminal component (41), a second cathode frame portion (722) serving as a second cathode terminal component (42), A third cathode frame portion (723) serving as a third cathode terminal component (43) is formed.

  FIG. 5 is a perspective view for explaining a frame body forming step of the method for manufacturing the solid electrolytic capacitor. A frame body formation process is a process performed after execution of a frame material preparation process. As shown in FIG. 5, in the frame body forming step, the frame body (61) is bent to form the frame body (62).

  At this time, the second anode frame part (712) is bent in an inverted L shape, and the tip part thereof is directed to the opposite side to the cathode frame (72). Thereby, the second anode terminal constituting part (32) is formed from the second anode frame part (712). Further, the second cathode frame portion (722) is bent in an inverted L shape, and the tip thereof is directed toward the anode frame (71), while the third cathode frame portion (723) is bent in an inverted L shape. As a result, the tip end portion is directed to the opposite side to the anode frame (71). Thus, a second cathode terminal component (42) is formed from the second cathode frame (722), and a third cathode terminal component (43) is formed from the third cathode frame (723).

  FIG. 6 is a perspective view for explaining a mounting process of the method for manufacturing the solid electrolytic capacitor. A mounting process is a process performed after execution of a frame body formation process. As shown in FIG. 6, in the mounting process, the capacitor element (1) is mounted on the frame body (62).

  At this time, the anode part of the capacitor element (1) (the tip part (121) of the anode lead (12)) is brought into contact with the tip part (321) of the second anode terminal constituting part (32). Specifically, the planar region (124) formed at the tip (121) of the anode lead (12) is brought into surface contact with the tip (321) of the second anode terminal component (32).

  Here, planar regions (123) and (124) are formed on both the upper surface and the lower surface of the tip (121) of the anode lead (12). Therefore, it is possible to mount the capacitor element (1) on the frame body (62) in a posture reversed upside down from the posture shown in FIG. 6, and in this case, the tip of the anode lead (12) ( The planar region (123) formed in 121) comes into surface contact with the tip (321) of the second anode terminal component (32).

  In the mounting process, the lower surface (10) of the capacitor element (1) (the lower surface of the cathode layer (15)) is connected to the tip portion (421) of the second cathode terminal component (42) and the conductive cathode. It adheres to each upper surface of the front-end | tip part (431) of a 3rd cathode terminal structure part (43). Thereafter, a welding process such as resistance welding or laser welding is performed on the contact surface between the anode part of the capacitor element (1) and the tip part (321) of the second anode terminal constituting part (32). Thereby, the anode part of the capacitor element (1) is fixed to the tip part (321) of the second anode terminal constituting part (32).

  Thus, the anode frame (71) is electrically connected to the anode part of the capacitor element (1), and the cathode frame (72) is electrically connected to the cathode part of the capacitor element (1).

  FIG. 7 is a perspective view for explaining the exterior resin forming step of the method for manufacturing the solid electrolytic capacitor. The exterior resin forming process is a process executed after the mounting process is executed. As shown in FIG. 7, in the exterior resin forming step, the exterior resin (2) is formed around the capacitor element (1) to produce the block body (63).

  At this time, the capacitor element (1) is covered with the exterior resin (2), and the anode frame (71) and the cathode frame (72) are embedded in the exterior resin (2). However, from the lower surface (20) of the exterior resin (2), the lower surfaces of the first anode frame portion (711), the first cathode frame portion (721), and the third frame (73) are exposed to provide the exterior resin. From both side surfaces of (2), both end portions of the first anode frame portion (711), the first cathode frame portion (721), and the third frame (73) are projected from the lower end position.

  FIG. 8 is a perspective view for explaining a cutting step of the method for manufacturing the solid electrolytic capacitor. A cutting process is a process performed after execution of an exterior resin formation process. As shown in FIG. 8, in the cutting step, the block body (63) is cut. Specifically, the first anode frame portion (711) of the anode frame (71), the cathode frame (72) of the anode frame (71) are separated from the side surface of the exterior resin (2) along the line BB extending along the side surface. The first cathode frame portion (721) and the third frame (73) are cut. Although not shown in the drawing, the same cutting process is performed on the other side of the exterior resin (2) on the paper surface of FIG.

  By executing the cutting process, both end portions of the first anode frame portion (711), the first cathode frame portion (721), and the third frame (73) are moved from the lower end positions on both side surfaces of the exterior resin (2). It will protrude (see FIG. 9).

FIG. 9 is a perspective view for explaining a folding step of the method for manufacturing the solid electrolytic capacitor. A bending process is a process performed after execution of a cutting process. As shown in FIG. 9, in the bending step, both end portions of the first anode frame portion (711), the first cathode frame portion (721), and the third frame (73) are bent upward to form an exterior resin ( Along the side of 2). As a result, the first anode terminal component (31) is formed from the first anode frame (711), the first cathode terminal component (41) is formed from the first cathode frame (721), and the first anode frame (711) is formed. A third terminal (5) is formed from the third frame (73).
Thus, the solid electrolytic capacitor is completed as shown in FIGS.

  In the solid electrolytic capacitor, the cathode terminal (4) is formed by bending and deforming one metal plate (specifically, the frame material (61)). Accordingly, the solid electrolytic capacitor according to the present invention is easier to manufacture than the conventional solid electrolytic capacitor in which a cathode terminal is formed by cutting a single metal plate having a large thickness. Also, the manufacturing cost is low. Furthermore, since the cathode terminal (4) can be formed using a metal plate having a small thickness compared to a conventional solid electrolytic capacitor, the material cost is reduced.

  An electrical path is formed between the anode terminal surface (30) and the cathode terminal surface (40) via the capacitor element (1). Here, in the solid electrolytic capacitor, the cathode terminal surface (40) can be disposed close to the anode terminal surface (30), and according to the configuration of the solid electrolytic capacitor, the capacitor element (1 ) (10) (lower surface of the cathode layer (15)), the capacitor element (more than the region facing the first cathode terminal component (41) (that is, the region facing the cathode terminal surface (40)). The second cathode terminal constituting part (42) is electrically connected in a region close to the anode part (1) (the tip part (121) of the anode lead (12)). Therefore, in the solid electrolytic capacitor, the path can be shortened as compared with the conventional solid electrolytic capacitor, and therefore the inductance between the anode terminal surface (30) and the cathode terminal surface (40) is reduced. It is possible.

  In this embodiment, in the direction (90) from the anode terminal (3) to the cathode terminal (4), the length dimension L1 of the second cathode terminal component (42) is equal to that of the third cathode terminal component (43). It is smaller than the length dimension L2. Therefore, the cathode terminal (4) and the capacitor element (1) are reduced by reducing the length dimension L1 of the second cathode terminal component (42) while increasing the length dimension L2 of the third cathode terminal component (43). The cathode terminal surface (40) can be brought close to the anode terminal surface (30) without substantially changing the connection area of the cathode portion (cathode layer (15)). Accordingly, the electrical path between the anode terminal surface (30) and the cathode terminal surface (40) is shortened, and as a result, the inductance between the both terminal surfaces (30) and (40) is reduced.

  The inventor of the present application has confirmed by simulation that the ESL of the solid electrolytic capacitor of the present embodiment is reduced by about 10% compared to the ESL of the conventional solid electrolytic capacitor. In addition, this inventor thinks that ESL can be reduced 10% or more compared with the conventional solid electrolytic capacitor by optimizing the structure of a solid electrolytic capacitor.

  By the way, the solid electrolytic capacitor has a configuration in which the first cathode terminal component (41) of the cathode terminal (4) is separated from the lower surface (10) of the capacitor element (1) (the lower surface of the cathode layer (15)). ing. Accordingly, the connection area between the cathode terminal (4) and the cathode portion (cathode layer (15)) of the capacitor element (1) is the first cathode terminal component (41) of the lower surface (10) of the capacitor element (1). ) Will be reduced by the area of the area facing. However, in the solid electrolytic capacitor, the second cathode terminal component (42) and the third cathode terminal component (43) are provided on the cathode part of the capacitor element (1) on the lower surface (10) of the capacitor element (1). Are connected over a wide range. Therefore, it is possible to suppress a reduction in the connection area between the cathode terminal (4) and the cathode portion of the capacitor element (1).

  In the solid electrolytic capacitor, the second anode terminal constituent part (32) of the anode terminal (3) is a region on the opposite side of the outer peripheral edge of the first anode terminal constituent part (31) from the cathode terminal (4). The exterior resin (2) extends in an inverted L shape, and the tip (321) is directed to the opposite side of the cathode terminal (4). Accordingly, in a state where a part of the capacitor element (1) is disposed above the first anode terminal constituting part (31) of the anode terminal (3), the anode part (anode lead (12)) of the capacitor element (1) is arranged. Can be electrically connected to the second anode terminal component (32) of the anode terminal (3).

  Therefore, the volume ratio (occupancy ratio) occupied by the capacitor element (1) in the solid electrolytic capacitor can be increased. Specifically, the volume of the capacitor element (1) can be increased by about 10% or more as compared with the conventional solid electrolytic capacitor.

  When the solid electrolytic capacitor is mounted on a circuit board (not shown), an anode terminal surface (30), a cathode terminal surface (40), and a third terminal surface ( 50) will be soldered respectively.

  By the way, in the solid electrolytic capacitor, as described above, the cathode terminal surface (40) can be disposed close to the anode terminal surface (30). When the cathode terminal surface (40) is arranged close to the anode terminal surface (30), the cathode terminal surface (40) is biased toward the anode terminal surface (30) on the lower surface (20) of the exterior resin (2). Will be placed. Accordingly, when only the anode terminal surface (30) and the cathode terminal surface (40) are soldered to the land on the circuit board, only one side portion of the solid electrolytic capacitor is supported on the circuit board. For this reason, when an external force is applied to the solid electrolytic capacitor, the solder portion that fixes the solid electrolytic capacitor to the circuit board is easily broken.

  On the other hand, in the solid electrolytic capacitor, the third terminal surface (50) is soldered to the land on the circuit board in addition to the anode terminal surface (30) and the cathode terminal surface (40). It will be supported at 3 points. Therefore, even when an external force is applied to the solid electrolytic capacitor, the solder portion is not easily broken. As a result, the solid electrolytic capacitor is firmly fixed on the circuit board by soldering.

  In the present embodiment, the third terminal (5) is not electrically connected to the capacitor element (1). Therefore, the third terminal (5) functions as a dummy electrode for supporting the solid electrolytic capacitor on the circuit board at three points. However, the present invention is not limited to this. For example, by electrically connecting the third terminal (5) to the cathode part (cathode layer (15)) or the cathode terminal (4) of the capacitor element (1), the third terminal surface (50) can be You may make it function as 2 cathode terminal surfaces. As a result, the solid electrolytic capacitor has a three-terminal structure.

  In the solid electrolytic capacitor, both ends of the first anode terminal component (31), the first cathode terminal component (41), and the third frame (73) are on both sides of the exterior resin (2). It is bent along. Therefore, when the anode terminal surface (30), the cathode terminal surface (40), and the third terminal surface (50) are each soldered to the land on the circuit board, the solder is moved to the side surface side of the exterior resin (2). It is easy to wrap around and therefore easily generate fillets. Therefore, the connection state between the solid electrolytic capacitor and the land on the circuit board is improved.

  In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, the solid electrolytic capacitor may have a configuration in which the anode terminal (3) is different from the configuration described above. The solid electrolytic capacitor may have a configuration in which the third terminal (5) is not provided.

In the present invention, each of the second cathode terminal component (42), the third cathode terminal component (43), and the second anode terminal component (32) (hereinafter referred to as each component) has an “inverted L shape”. 2, specifically, the base end of each component extends substantially perpendicular to the first cathode terminal component (41) and the tip of each component is the first cathode. It is not limited to the shape extending substantially parallel to the terminal component (41). For example, the shape extending in an “inverted L shape” includes a shape in which the base end portion of each component portion is inclined with respect to a perpendicular to the first cathode terminal component portion (41), and the tip portion of each component portion is the first one. A shape which is not parallel to the one-cathode terminal component (41) but is inclined is included.
Furthermore, in the shape extending in the “inverted L shape”, the base end of the component provided with a step, a notch, a recess, and a hole in each component is the first cathode terminal component (41). A shape that extends substantially vertically and has a tip portion extending substantially parallel to the first cathode terminal component (41), a shape in which a base end portion is inclined with respect to a perpendicular to the first cathode terminal component (41), and a tip portion Include a shape that is not parallel to the first cathode terminal component (41) but is inclined.

  Furthermore, the various configurations employed in the solid electrolytic capacitor can be applied not only to a solid electrolytic capacitor whose capacitor element is a lead type, but also to a solid electrolytic capacitor whose capacitor element is a foil type.

(1) Capacitor element
(10) Bottom surface
(11) Anode body
(12) Anode lead (anode)
(13) Dielectric layer
(14) Electrolyte layer
(15) Cathode layer (cathode part)
(2) Exterior resin
(20) Bottom surface
(3) Anode terminal
(30) Anode terminal surface
(31) First anode terminal component
(32) Second anode terminal component
(4) Cathode terminal
(40) Cathode terminal surface
(41) First cathode terminal component
(42) Second cathode terminal component
(43) Third cathode terminal component
(5) Third terminal
(50) Third terminal surface L1 Length dimension of second cathode terminal component L2 Length dimension of third cathode terminal component

Claims (6)

A solid electrolytic capacitor element having an anode part, a cathode part, and a dielectric layer, an exterior resin covering the capacitor element, and embedded in the exterior resin and electrically connected to the anode part of the capacitor element An anode terminal; and a cathode terminal embedded in the exterior resin and electrically connected to the cathode portion of the capacitor element. The anode terminal and the cathode terminal are each exposed on the lower surface of the exterior resin and electrically connected to each other. In a solid electrolytic capacitor having an anode terminal surface and a cathode terminal surface that are spaced apart from each other,
The cathode terminal includes a first cathode terminal component that forms the cathode terminal surface, and a first L-shaped portion extending from the first cathode terminal component in the exterior resin so that a tip is directed to the anode terminal. A second cathode terminal component, and a third cathode terminal component extending in an inverted L shape from the first cathode terminal component in the exterior resin and having a tip directed to the opposite side of the anode terminal, A solid electrolytic capacitor, wherein the second cathode terminal component and the third cathode terminal component are electrically connected to a cathode portion of the capacitor element on a lower surface of the capacitor element.   The second cathode terminal component extends in an inverted L shape from the region on the anode terminal side in the outer peripheral edge of the first cathode terminal component, while the third cathode terminal configuration from the region opposite to the anode terminal The solid electrolytic capacitor according to claim 1, wherein the portion extends in an inverted L shape.   3. The solid electrolytic capacitor according to claim 2, wherein the length dimension of the second cathode terminal component is smaller than the length dimension of the third cathode terminal component in the direction from the anode terminal toward the cathode terminal.   The solid electrolytic capacitor according to claim 1, wherein the cathode terminal is formed by bending and deforming one metal plate.   The anode terminal includes a first anode terminal constituent part forming the anode terminal surface, and an outer L of the outer periphery of the first anode terminal constituent part. The solid electrolytic capacitor according to any one of claims 1 to 4, further comprising a second anode terminal constituent portion extending in a shape and having a tip portion directed to a side opposite to the cathode terminal.   A third terminal different from the anode terminal and the cathode terminal is further provided, and the third terminal is an exposed area of the anode terminal surface with respect to an exposed area of the cathode terminal surface of the lower surface of the exterior resin. The solid electrolytic capacitor according to claim 1, wherein the solid electrolytic capacitor has a third terminal surface exposed in a region on the opposite side.

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