JP5371865B2 - 3-terminal capacitor - Google Patents

Description

  The present invention relates to a three-terminal capacitor, and more particularly to a three-terminal capacitor for mounting on a substrate to be mounted on which a two-terminal pattern is formed.

  Conventionally, a capacitor element in a solid electrolytic capacitor has an anode portion made of a valve metal such as aluminum or tantalum as an anode portion, an oxide film layer formed on the other surface as a dielectric film, and a dielectric film. It is known that a cathode part is formed by sequentially forming a solid electrolyte layer, a carbon layer, and a silver layer on the surface of a body membrane (see, for example, Patent Document 1).

  In recent years, electronic devices have become smaller and higher in frequency, and solid electrolytic capacitors have been required to have low impedance in the high frequency region. Solids using high-conductivity conductive polymers as solid electrolyte layers Electrolytic capacitors have been commercialized. This solid electrolytic capacitor is used in various fields because it can achieve a lower ESR than a solid electrolytic capacitor using manganese dioxide (see, for example, Patent Document 2).

  In addition, as the speed of CPUs used in computers and the like increases, solid electrolytic capacitors are required to be charged and discharged at high speed when supplying electric charge from the solid electrolytic capacitors to the CPUs, and must have low ESR and low ESL. Is a prerequisite.

  As a solid electrolytic capacitor for realizing low ESR, a stacked solid electrolytic capacitor in which a plurality of flat capacitor elements are stacked is widely used. The laminated structure of this multilayer solid electrolytic capacitor includes a flat capacitor element having an anode part and a cathode part made of a solid electrolyte layer, a carbon layer, and a silver layer. The anode part is an anode part, and the cathode part is a There is known a two-terminal configuration in which a plurality of cathode portions are stacked such that the cathode portions overlap each other and are respectively connected to an anode terminal and a cathode terminal (see, for example, Patent Document 3).

  However, in Patent Document 3, since the element structure has two terminals, there remains a problem that the ESL is high. Therefore, the applicant of the present invention, as a multilayer structure of the multilayer solid electrolytic capacitor, laminated the flat capacitor elements alternately so that the anode part faces the cathode part at the center, and the anode part and the cathode part are branched into a plurality of parts. A three-terminal structure that cancels out the magnetic field and electrically lowers the ESL by electrically connecting the anode portions at the shortest distance is proposed (for example, see Patent Document 4).

Japanese Patent No. 2996992 JP 2003-45753 A JP 2000-68158 A JP 2007-1116064 A

  On the other hand, the multilayer solid electrolytic capacitor described in Patent Document 4 has a three-terminal structure in which two anode terminals are provided at both ends of the mounting surface, and a cathode terminal is provided between the two anode terminals. It was necessary to form a pattern for three terminals on the substrate to be mounted on which this three-terminal multilayer solid electrolytic capacitor was mounted. The pattern for three terminals is more complicated than the pattern for two terminals, and there is a problem that it is difficult to design a substrate to be mounted.

  In view of the above problems, the present invention provides a three-terminal capacitor that enables mounting on a mounted substrate on which a pattern for two terminals is formed without impairing the electrical characteristics of the three-terminal structure. Let it be an issue.

In order to solve the above problems, a three-terminal capacitor according to the present invention includes two anode terminals provided at both ends of a mounting surface, and a cathode terminal provided between the two anode terminals. In the three-terminal capacitor, when the direction in which the two anode terminals are arranged is the X direction, and the direction orthogonal to the X direction is the Y direction, the terminal surfaces of the two anode terminals are arranged in one end side region in the Y direction. On the other hand, the cathode terminal is composed of two sub terminals separated into one end region in the Y direction and the other end region in the Y direction, and the sub terminal located in the one end region in the Y direction is the two sub terminals. By covering with an insulating member, the terminal surface of the cathode terminal is arranged in the other end side region in the Y direction.

According to this configuration, the terminal surfaces of the two anode terminals are in the Y direction one end side region, and the terminal surfaces of the cathode terminals are in the Y direction other end side region. As a result, the three-terminal capacitor according to the present invention can be applied to a substrate to be mounted on which a two-terminal pattern (an anode pattern and a cathode pattern) that can be easily designed is formed without impairing the electrical characteristics of the three-terminal capacitor. Implementation is possible. Furthermore, when the cathode terminal is composed of two sub-terminals separated into one end side region in the Y direction and the other end side region in the Y direction, it is possible to adopt a terminal structure in which the two anode terminals are electrically connected. The electrical characteristics of the three-terminal capacitor can be improved.

Further, in the above three-terminal capacitor, Y-direction other end side region of the two anode terminals and being covered with an insulating member.

  According to this structure, the Y direction other end side area | region of the terminal surface of two anode terminals and the Y direction one end side area | region of the terminal surface of a cathode terminal are covered with the insulating member. Therefore, even if two anode terminals and a cathode terminal are mounted so as to straddle a two-terminal pattern (an anode pattern and a cathode pattern) on the mounting substrate, the anode terminal and the cathode pattern are prevented from conducting, and the cathode It is possible to prevent conduction between the terminal and the anode pattern.

  Furthermore, in the above configuration, the insulating member is preferably an insulating tape member. According to this configuration, it is possible to easily insulate the Y-direction other end region of the terminal surfaces of the two anode terminals and the Y-direction one end region of the terminal surfaces of the cathode terminals from the cathode pattern and the anode pattern, respectively. In addition, the thickness of the insulating member can be made uniform, and the three-terminal capacitor can be stably mounted on the substrate to be mounted.

  As such a three-terminal capacitor, a capacitor element in which an anode part is formed on one side and a cathode part is formed on the other side of a flat anode element made of a valve metal, and the protruding direction of the anode part with the cathode part as the center is used. A laminated body formed by stacking a plurality of sheets so as to be alternately reversed is sealed with an exterior resin, and an anode part protruding from one side of the laminated body and an anode part protruding from the other side each have two anodes. A configuration in which the terminal is electrically connected and the cathode portion is electrically connected to the cathode terminal can be employed.

  According to the present invention, it is possible to provide a three-terminal capacitor that can be mounted on a substrate to be mounted on which a pattern for two terminals is formed without impairing the good electrical characteristics of the three-terminal structure.

It is a capacitor | condenser element in one Embodiment of this invention, Comprising: (a) is a top view, (b) is sectional drawing. 1A is a plan view, FIG. 1B is a side view, and FIG. 3C is a side view showing a state of being arranged on a lead frame. 1A is a plan view of a lead frame according to an embodiment of the present invention, and FIG. 2B is a plan view showing a state in which an insulator is disposed. It is a figure which shows the state which has arrange | positioned the laminated body in one Embodiment of this invention on a lead frame, (a) is a top view, (b) is sectional drawing which cut | disconnected (a) by the line A, (c). FIG. 4 is a cross-sectional view taken along line B of FIG. It is a top view which shows the positional relationship of the lead frame and pattern in one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a 3 terminal type | mold laminated solid electrolytic capacitor which concerns on one Embodiment of this invention, Comprising: (a) is a bottom face (mounting surface) figure, (b) is a side view. It is a top view which shows the positional relationship of the lead frame and pattern in another embodiment of this invention. FIG. 3 is a three-terminal multilayer solid electrolytic capacitor according to another embodiment of the present invention, in which (a) is a bottom surface (mounting surface) view and (b) is a side view. 6 is a plan view showing a positional relationship between a lead frame and a pattern in the multilayer solid electrolytic capacitor of Comparative Example 1. FIG. 6 is a plan view showing a positional relationship between a lead frame and a pattern in a multilayer solid electrolytic capacitor of Comparative Example 2. FIG. It is a top view which shows the positional relationship of the lead frame and pattern in the 3 terminal type multilayer solid electrolytic capacitor of a prior art example.

  Hereinafter, a three-terminal multilayer solid electrolytic capacitor will be described as an example of the three-terminal capacitor according to the present invention with reference to the drawings.

  FIG. 1A is a plan view of a capacitor element c used in the three-terminal multilayer solid electrolytic capacitor according to the present invention, and FIG. As shown in the figure, the capacitor element c is composed of an anode element 1, a dielectric film 2, a solid electrolyte layer 3, a carbon layer 4, a silver layer 5, and a creeping prevention material 6.

  The anode element 1 is a flat thin plate having a width (w) of 10 mm and a length (l) of 15 mm whose main component is aluminum which is a valve action metal, and one side thereof constitutes an anode part 7. Dielectric film 2 is an oxide film layer formed on the other surface of anode element 1. The solid electrolyte layer 3 is a layer formed on the surface of the dielectric film 2, and is formed, for example, by chemical polymerization, electrolytic polymerization, or impregnation of an electrolyte containing a conductive polymer such as polyethylenedioxythiophene (PEDT). Layer. The carbon layer 4 and the silver layer 5 are cathode lead layers sequentially formed on the surface of the solid electrolyte layer 3, and together with the solid electrolyte layer 3 constitute a cathode portion. The creeping prevention material 6 is a ring-shaped film that is provided between the anode part 7 and the solid electrolyte layer 3 and insulates and isolates the anode part 7 and the cathode part.

  The capacitor element c is manufactured as follows. First, an anode element 1 made of an aluminum thin plate having a thickness of 0.1 mm whose surface was electrochemically roughened was anodized for about 60 minutes by applying a voltage of 10 V in an aqueous solution of ammonium adipate. A dielectric film 2 that is an oxide film layer is formed on the surface of the element 1. Next, after the anode element 1 on which the dielectric film 2 is formed is cut into dimensions of width (w) 10 mm and length (l) 15 mm, an insulating resin is applied around an appropriate position so as to be wound in the circumferential direction. The creeping prevention material 6 is formed and divided into a region to be the anode portion 7 and a region to be the cathode portion. Next, the end face portion where the anode element 1 is exposed by the cutting is subjected to an anodic oxidation treatment for about 30 minutes by applying a voltage of 7 V again in an aqueous solution of ammonium adipate to form the dielectric film 2 on the cut surface. Thereafter, the solid electrolyte layer 3, the carbon layer 4, and the silver layer 5 are sequentially formed on the surface of the dielectric film 2 to constitute the cathode portion, thereby completing the capacitor element c.

  2A and 2B are a plan view and a side view of a laminated body in which the four capacitor elements c1 to c4 manufactured by the above method are laminated, and FIG. 2C is a laminated body arranged on a lead frame. It is a side view of a state.

  The laminated body is obtained by laminating capacitor elements c1 to c4 so that the protruding directions of the anode portions 7 and 7 'are alternately reversed. The cathode portions of the capacitor elements c1 to c4 are connected by the conductive adhesive 8, respectively. The anode parts 7 and 7 ′ on both sides of the laminate are connected to the anode terminals 9 and 9 ′ by a method such as resistance welding, and the cathode part and the cathode terminal 10 in the center of the laminate are connected via a conductive adhesive 8. Are joined. The anode terminals 9, 9 'and the cathode terminal 10 are made of a copper alloy.

  FIG. 3A is a plan view of a lead frame used in the three-terminal multilayer solid electrolytic capacitor according to the present invention, and FIG. 3B is a plan view showing a state in which an insulator is disposed on the lead frame. 4A is a plan view showing a state in which the laminate is disposed on the lead frame, FIG. 4B is a cross-sectional view taken along line A in FIG. 4A, and FIG. 4C is a cross-section taken along line B in FIG. FIG.

  As shown in FIG. 3A, the lead frame includes anode terminals 9 and 9 ′, cathode terminals 10 and 10 ′, and a connecting portion 11.

  The anode terminals 9 and 9 'are connected to the anode portions 7 and 7' of the laminate by resistance welding, respectively. The anode terminals 9 and 9 ′ are connected by a connecting portion 11 having a length of 12.6 mm made of the same material as the anode terminals 9 and 9 ′ (for example, a copper alloy), and the anode terminals 9 and 9 ′ and the connecting portion 11 are integrated. H-shaped lead frame. As shown in FIGS. 4B and 4C, the cross section of the H-shaped lead frame is such that the anode terminals 9 and 9 'at both ends are thick and the connecting portion 11 is thin. Since the connecting portion 11 is embedded in an exterior resin (not shown), the anode terminals 9, 9 'and the connecting portion 11 are difficult to come off from the exterior resin.

  The cathode terminals 10 and 10 'are provided symmetrically with respect to the connecting portion 11 with a gap of 0.5 mm from the connecting portion 11, and the cathode portions of the capacitor elements c1 to c4 and the conductive adhesive 8 such as silver paste. Connected by.

  The insulator 12 is provided so as to cover at least the entire surface of the connecting portion 11 on the laminate side, and is electrically conductive when the cathode portions of the capacitor elements c1 to c4 and the cathode terminals 10 and 10 ′ are connected by the conductive adhesive 8. The adhesive 8 is prevented from adhering to the side surface and the bottom surface of the connecting portion 11. Specifically, as shown in FIG. 3 (b), a polyimide tape having a length of 12.6 mm is provided as an insulator 12 over the surface of the connecting portion 11 and the cathode terminals 10 and 10 ′ on the laminate side. It has been. The thickness of the insulator 12 made of polyimide tape is preferably 10 μm or less, and if it is thicker than 10 μm, the connection between the cathode portions of the capacitor elements c1 to c4 and the cathode terminals 10 and 10 ′ becomes weak and the ESR becomes large. There is a risk of malfunction.

  Next, examples of the present invention will be described. In the following description, the direction in which the anode terminals are arranged is the X direction, and the direction orthogonal to the X direction is the Y direction.

Example 1
FIG. 5 is a plan view showing the positional relationship between the lead frame and the pattern in the three-terminal multilayer solid electrolytic capacitor C1 according to this embodiment. 6A is a bottom view (mounting surface) of the three-terminal multilayer solid electrolytic capacitor C1 according to the present embodiment, and FIG. 6B is a diagram illustrating the three-terminal multilayer solid electrolytic capacitor C1 of FIG. FIG.

  As shown in FIG. 5, the three-terminal multilayer solid electrolytic capacitor C1 is mounted over a pattern for two terminals (anode pattern 16 and cathode pattern 17) formed on the mounting substrate. The mounting surface of the three-terminal multilayer solid electrolytic capacitor C1 is divided in the Y direction into a Y direction one end side region A1 corresponding to the anode pattern 16 and a Y direction other end side region A2 corresponding to the cathode pattern 17. Yes.

  As shown in FIG. 6, in the three-terminal multilayer solid electrolytic capacitor C1, the anode terminals 9 and 9 ′ are provided over the entire Y direction, and the cathode terminals 10 and 10 ′ including two sub-terminals are one end side region in the Y direction. A1 and the Y direction other end side region A2 are provided. The mounting surface sides of the anode terminals 9, 9 'and the cathode terminal 10' are exposed from the exterior resin 13, and become terminal surfaces 9A, 9'A and a terminal surface 10'A, respectively.

  Further, as shown in FIG. 5, an insulating member 15 made of a polyimide tape for insulating the cathode terminal 10 and the anode pattern 16 is provided on the mounting surface side of the cathode terminal 10 in the one end region A1 in the Y direction. Insulating members 14, 14 'made of polyimide tape for insulating the anode terminals 9, 9' and the cathode pattern 17 are provided on the mounting surface side of the anode terminals 9, 9 'in the Y-direction other end side region A2. It has been. For this reason, the anode terminals 9 and 9 ′ do not appear in the Y direction other end side region A 2, and are exposed on the mounting surface only in the Y direction one end side region A 1. Further, the cathode terminal 10 does not appear in the Y direction one end region A1, and the cathode terminal 10 'is exposed on the mounting surface only in the Y direction other end region A2. In other words, the terminal surfaces 9A and 9′A of the anode terminals 9 and 9 ′ are arranged only in the Y direction one end region A1, and the terminal surface 10′A of the cathode terminal 10 ′ is only in the Y direction other end region A2. Has been placed.

  In order to mount the three-terminal multilayer solid electrolytic capacitor C1 on the mounting substrate on which the anode pattern 16 and the cathode pattern 17 are formed, the thickness of the insulating members 14, 14 ′, 15 should be 10 μm or less. preferable. Since the terminal surfaces 9A, 9′A of the anode terminals 9, 9 ′ and the anode pattern 16 and the terminal surface 10′A of the cathode terminal 10 ′ and the cathode pattern 17 are connected via solder, the insulating members 14, 14 are connected. When the thickness of ', 15 is larger than 10 µm, the gap between the terminal surfaces 9A, 9'A of the anode terminals 9, 9' and the anode pattern 16 and the terminal surface 10'A of the cathode terminal 10 'and the cathode pattern 17 becomes large. There is a risk of poor soldering.

(Example 2)
FIG. 7 is a plan view showing the positional relationship between the lead frame and the pattern in the three-terminal multilayer solid electrolytic capacitor C2 according to this example. FIG. 8A is a bottom view (mounting surface) of the three-terminal multilayer solid electrolytic capacitor C2 according to this embodiment, and FIG. 8B is a view of the three-terminal multilayer solid electrolytic capacitor C2 of FIG. FIG.

  As shown in FIG. 7, the three-terminal multilayer solid electrolytic capacitor C2 is mounted over the anode pattern 16 and the cathode pattern 17 in the same manner as in Example 1, and the mounting surface thereof is the Y-direction one end side region A1. The Y direction is divided into two in the Y direction.

  Further, the three-terminal multilayer solid electrolytic capacitor C2 has the anode terminals 18, 18 ′ and one Y direction in the Y-direction other end region A2 before the laminate, the anode terminals 18, 18 ′ and the cathode terminal 19 are welded. By cutting off the cathode terminal in the end region A1, the anode terminals 18, 18 'are provided only in the Y direction one end region A1, and the cathode terminal 19 is provided only in the Y direction other end region A2. Become. As shown in FIG. 8, the exterior resin 13 is formed around the portions where the anode terminals 18, 18 'and the cathode terminal are cut off. Therefore, as shown in FIG. 7, the anode terminals 18, 18 ′ do not appear in the Y direction other end side region A2, but are exposed on the mounting surface only in the Y direction one end side region A1, and the cathode terminal 19 is It does not appear in one end side area A1 in the Y direction and is exposed on the mounting surface only in the other end side area A2 in the Y direction. As a result, the entire mounting surface side of the anode terminals 18 and 18 'and the entire mounting surface side of the cathode terminal 19 become the terminal surfaces 18A and 18'A and the terminal surface 19A, respectively.

(Comparative Example 1)
9 is a plan view showing the positional relationship between the lead frame and the pattern in the multilayer solid electrolytic capacitor C3 of Comparative Example 1. FIG. As shown in the figure, the multilayer solid electrolytic capacitor C3 has an anode pattern 20 and a cathode pattern 21 in a state in which an anode terminal 9 'provided at one end in the X direction is completely covered with an insulating member 14 made of polyimide tape. Implemented above.

(Comparative Example 2)
10 is a plan view showing the positional relationship between the lead frame and the pattern in the multilayer solid electrolytic capacitor C4 of Comparative Example 2. FIG. As shown in the figure, the multilayer solid electrolytic capacitor C4 is mounted on the anode pattern 20 and the cathode pattern 21 as in the first comparative example. Further, in the multilayer solid electrolytic capacitor C4, the anode terminal provided at one end in the X direction is cut out before welding the laminate, the anode terminal 9, and the cathode terminals 10 and 10 ′, and the exterior resin 13 is cut into the cut portion. Wrap around and form.

(Conventional example)
FIG. 11 is a plan view showing the positional relationship between a lead frame and a pattern in a conventional three-terminal multilayer solid electrolytic capacitor C5. As shown in the figure, the three-terminal multilayer solid electrolytic capacitor C5 is mounted on a three-terminal pattern (anode patterns 22, 22 ′ and a cathode pattern 23) formed on the mounted substrate.

  In Examples 1 and 2, Comparative Examples 1 and 2, and the conventional example, the rating is 2.5 V-1200 μF, the length (L) dimension: 16 mm, the width (W) dimension: 12 mm, and the height (H) dimension: 2.5 mm three-terminal multilayer solid electrolytic capacitors C1 to C2 and C5 and multilayer solid electrolytic capacitors C3 to C4 were produced.

  Table 1 is a table showing impedances of the three-terminal multilayer solid electrolytic capacitors C1 to C2 and C5 and the multilayer solid electrolytic capacitors C3 to C4. The impedance is obtained by averaging 50 impedances measured at 1 MHz by preparing three 3-terminal multilayer solid electrolytic capacitors C1 to C2, C5 and multilayer solid electrolytic capacitors C3 to C4.

  As can be seen from Table 1, the impedance of the three-terminal multilayer solid electrolytic capacitors C1 to C2 of Examples 1 and 2 mounted on the two-terminal pattern (the anode pattern 16 and the cathode pattern 17) and the three-terminal pattern The impedance of the mounted conventional three-terminal multilayer solid electrolytic capacitor C5 was almost the same. In the three-terminal multilayer solid electrolytic capacitors C1 and C2, the anode terminals 9, 9 ′ (18, 18 ′) are connected by the connecting portion 11, and even if the mounting to the pattern for two terminals is 3 This is probably because the good electrical characteristics of the terminal structure are not impaired. Moreover, about the point which the impedance raises a little in Examples 1-2, terminal surface 9A, 9'A (18A, 18'A) of the anode pattern 16 and anode terminal 9, 9 '(18, 18') is shown. It is thought that this is because the contact area between the cathode pattern 17 and the area of the terminal surface 10′A (19A) of the cathode terminal 10 ′ (19) is reduced.

  Further, when the three-terminal multilayer solid electrolytic capacitors C1 to C2 of Examples 1 and 2 are compared with the multilayer solid electrolytic capacitors C3 to C4 of Comparative Examples 1 and 2, the three-terminal multilayer solid electrolytic capacitors C1 to C2 are better. The impedance value is low. This is because, in the multilayer solid electrolytic capacitors C3 to C4 of Comparative Examples 1 and 2, the anode terminal 9 ′ provided at one end in the X direction is not connected to the anode pattern 20, or the anode provided at one end in the X direction. Since the terminal is cut off, it is thought that this is because it does not function as a three-terminal structure.

  The preferred embodiments of the three-terminal capacitor according to the present invention have been described above, but the present invention is not limited to these configurations.

  For example, the range in which the insulating members 14 and 14 ′ are provided or the range in which the anode terminals 18 and 18 ′ on the other end side region A2 side in the Y direction are cut out is the terminal surface 9A of the anode terminals 9 and 9 ′ (18 and 18 ′). Any change can be made as long as 9′A (18A, 18′A) is in a range connected only to the anode pattern 16. However, since the impedance characteristics deteriorate as the contact area between the terminal surfaces 9A, 9′A (18A, 18′A) of the anode terminals 9, 9 ′ (18, 18 ′) and the anode pattern 16 becomes smaller, FIG. As shown in FIG. 7, the anode terminals 9, 9 ′ (18, 18 ′) are preferably exposed on the mounting surface over the entire Y direction in the Y direction one end side region A1.

  Further, the anode terminals 9 and 9 ′ do not appear in the Y direction other end side region A2, but are exposed on the mounting surface only in the Y direction one end side region A1, and the cathode terminals 10 and 10 ′ are exposed in the Y direction one end side region A1. The anode terminals 9 and 9 'on the Y direction other end side region A2 side and the cathode terminal 10 on the Y direction one end side region A1 side so as to be exposed to the mounting surface only in the Y direction other end side region A2. The thickness may be reduced and embedded in the exterior resin 13. In this case, the exterior resin 13 functions as the insulating members 14, 14 ′, and 15.

  Furthermore, in Example 1, although the polyimide tape was used as the insulating members 14, 14 ′, 15, a tape member such as a tape containing glass fiber, a polypropylene tape, a polyethylene terephthalate tape, a polytetrafluoroethylene tape, a polyester tape, or the like. The same effect can be obtained with an insulating member such as an insulating resin. Since the insulator 12 can also be arbitrarily selected from the above members, it is preferable in manufacturing to provide the insulating members 14, 14 ', 15 and the insulator 12 using a common member.

  In Examples 1 and 2, aluminum was used as the valve metal, but tantalum, niobium foil, or a sintered body of these metal powders may be used. Furthermore, in Examples 1-2, although the conductive polymer was used as the solid electrolyte layer 3, manganese dioxide may be used.

  Further, the connecting part 11 is preferably made of the same material as the anode terminals 9 and 9 ′, and is integrally formed as shown in FIG. 3A, but the material of the connecting part 11 is copper, aluminum, silver, Any conductive material such as gold, niobium, tantalum, and conductive polymer can be selected.

  Furthermore, in Examples 1 and 2, the lower surfaces of the anode terminals 9 and 9 ′ and the cathode terminals 10 and 10 ′ have the same height, so that a mounted substrate such as a mother board or an IC substrate on which a pattern for two terminals is formed. It is convenient when implemented in When the lower surfaces of the anode terminal and the cathode terminal do not need to be aligned at the same height, the connecting portion may be provided along the lower surface of the cathode terminal.

  Further, a connecting portion may be provided between the cathode terminals 10 and 10 ′ so as to intersect with the connecting portion 11 between the anode terminals 9 and 9 ′. Further, the connecting portion 11 may be at the center or one side of the cathode terminals 10 and 10 ′, and the number of connecting portions 11 may be two or more, and a cathode terminal may be provided therebetween. In this case, it is necessary to provide the insulator 12 between all the cathode terminals and the connecting portion.

  Further, as the anode terminals 9, 9 ′ (18, 18 ′) and the cathode terminals 10, 10 ′ (19), instead of the lead frame, through holes (conduction terminal holes) connected to the substrate to be mounted or conductive layers are provided. An insulating substrate provided may be used.

  In Examples 1 and 2, four capacitor elements c are stacked, but the same effect can be obtained with the capacitor elements c regardless of the number of stacked layers.

  In Examples 1 and 2, the example in which the lead frame is provided on the lower side of the stacked body has been described. However, depending on the position of the pattern formed on the mounted substrate, the lead frame may be provided on the upper side of the stacked body. Good.

  In Examples 1 and 2, capacitor elements provided with an anode portion at one end were laminated so that the protruding directions of the anode portions were alternately opposite. One or a plurality of capacitor elements each provided with a cathode portion may be laminated.

c, c1 to c4 Capacitor element 1 Anode element 2 Dielectric film 3 Solid electrolyte layer 4 Carbon layer 5 Silver layer 6 Scooping prevention material 7, 7 ′ Anode portion 8 Conductive adhesive 9, 9 ′, 18, 18 ′ Anode Terminals 10, 10 ′, 19 Cathode terminal 11 Connecting portion 12 Insulator 13 Exterior resin 14, 14 ′, 15 Insulating member 16 Anode pattern 17 Cathode pattern

Claims (4)

In a three-terminal capacitor comprising two anode terminals provided at both ends of the mounting surface and a cathode terminal provided between the two anode terminals,
When the direction in which the two anode terminals are arranged is the X direction, and the direction perpendicular to the X direction is the Y direction,
While the terminal surfaces of the two anode terminals are arranged in the Y direction one end side region,
The cathode terminal is composed of two sub terminals separated into the Y direction one end side region and the Y direction other end side region, and the sub terminal located in the Y direction one end side region of the two sub terminals. The terminal is covered with an insulating member, so that the terminal surface of the cathode terminal is disposed in the other end side region in the Y direction. Three-terminal capacitor of claim 1, wherein the Y-direction other end side region of the two anode terminals and being covered with an insulating member. Wherein the insulating member is three-terminal capacitor according to claim 1 or 2, characterized in that a tape member of insulating. A plurality of capacitor elements in which an anode portion is formed on one side and a cathode portion is formed on the other side of a plate-like anode element made of a valve metal so that the protruding directions of the anode portions are alternately opposite to each other centering on the cathode portion. The laminate formed by stacking sheets is sealed with exterior resin,
The anode part protruding from one side of the laminate and the anode part protruding from the other side are electrically connected to the two anode terminals, respectively, and the cathode part is electrically connected to the cathode terminal. The three-terminal capacitor according to any one of claims 1 to 3, wherein the three-terminal capacitor is provided.

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