JP2008159826A - Solid electrolytic capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid electrolytic capacitor capable of stably improving an yield at a time when manufacturing the solid electrolytic capacitor. <P>SOLUTION: The solid electrolytic capacitor has a positive electrode body 1 and the positive electrode lead member. The positive electrode body 1 has an inner-peripheral region 115 on an end face 11. The inner-peripheral region 115 has a distance equal to an edge size f among the long sides 111 and 112 and short sides 113 and 114 of the end face 11. The edge size f represents an yield size determining the yield at the time when manufacturing the solid electrolytic capacitor. The positive electrode lead member is implanted into the inner-peripheral region 115 on the end face 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a solid electrolytic capacitor, and more particularly to a solid electrolytic capacitor capable of improving yield when producing a solid electrolytic capacitor.

  With the digitization of electronic devices, capacitors used in electronic devices are also required to be small, large capacity, and low in equivalent series resistance in the high frequency region.

  As such a small capacitor having a large capacity and low equivalent series resistance, a solid electrolytic capacitor using an electron conductive solid such as manganese dioxide and 7,7,8,8-tetracyanoquinodimethane complex salt as a cathode material is known. is there.

  There is also a solid electrolytic capacitor using a conductive polymer such as polythiophene, polypyrrole, polyaniline and polyfuran as a cathode material.

  Conventionally, as a solid electrolytic capacitor, a solid electrolytic capacitor is known in which the cross-sectional shape of an anode lead member planted on an anode body made of a valve metal such as tantalum is flat (Patent Document 1).

FIG. 15 is a perspective view showing an anode body and an anode lead member of a conventional solid electrolytic capacitor. Referring to FIG. 15, the conventional solid electrolytic capacitor includes anode body 100 and anode lead member 110. The anode lead member 110 is planted on one end face of the anode body 100 so that a part thereof is embedded in the anode body 100. The anode lead member 110 has a flat cross-sectional shape having a width A and a thickness B, and the width A has a dimension larger than the thickness B.
JP 2006-216680 A

  However, the conventional solid electrolytic capacitor has a problem that the yield of the solid electrolytic capacitor is lowered depending on the arrangement position of the anode lead member on the end face.

  Therefore, the present invention has been made to solve such a problem, and an object of the present invention is to provide a solid electrolytic capacitor capable of stably improving the yield when producing the solid electrolytic capacitor.

  According to the present invention, the solid electrolytic capacitor includes an anode body, a dielectric film, a solid electrolyte layer, a cathode lead layer, and an anode lead member. The anode body is made of a sintered body of valve action metal. The dielectric film is formed in contact with the anode body. The solid electrolyte layer is formed in contact with the dielectric film. The cathode lead layer is formed in contact with the solid electrolyte layer. The anode lead member is planted on one end face of the anode body, and a part thereof is embedded in the anode body. The anode lead member has a cross-sectional shape formed by two opposing straight lines and a curve connecting the two straight lines at one end surface, and the distance between the outer peripheral edge of the one end surface produces a solid electrolytic capacitor It is planted in the inner periphery area set to the yield dimension which determines the yield of the.

  Preferably, the one end surface has a quadrangular shape having a long side and a short side, and the anode lead member is planted in the inner peripheral region so that two straight lines are substantially parallel to the long side of the one end surface. ing.

  Preferably, c ≦ T−2f holds when the interval between two straight lines is c, the yield dimension is f, and the length of the short side is T.

  Preferably c is approximately equal to T-2f.

  Preferably, when a circular area having a diameter larger than T-2f is S, the anode lead member has a cross-sectional area substantially equal to the area S at one end face.

  Preferably, the anode lead member has a cross-sectional shape in which two straight lines are connected by two opposing curves.

  Preferably, the two curves have a shape that is convex toward the outer periphery of the one end surface.

  Preferably, the anode body includes niobium.

  Preferably, the anode lead member is made of niobium or tantalum.

  In the solid electrolytic capacitor according to the present invention, an anode lead member having a cross-sectional shape composed of two opposing straight lines and a curve connecting the two straight lines has a yield dimension that determines the yield when the solid electrolytic capacitor is manufactured. It has a structure planted in the inner peripheral area determined in consideration. As a result, the yield when the solid electrolytic capacitor is manufactured becomes a certain level or more.

  Therefore, according to the present invention, the yield of the solid electrolytic capacitor can be stably improved.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is a cross-sectional view showing a configuration of a solid electrolytic capacitor according to an embodiment of the present invention. Referring to FIG. 1, solid electrolytic capacitor 10 includes anode body 1, anode lead member 2, dielectric oxide film 3, conductive polymer layer 4, cathode lead layer 5, and conductive adhesive 6. And a cathode terminal 7, an anode terminal 8, and a resin 9.

The anode body 1 is made of niobium. The anode lead member 2 has one end connected to the anode body 1 and the other end connected to the anode terminal 8. The anode lead member 2 is made of niobium. The dielectric oxide film 3 is made of niobium pentoxide (Nb ₂ O ₅ ), and is formed on the entire surface of the anode body 1 and a part of the surface of the anode lead member 2.

  The conductive polymer layer 4 is made of a polymer compound made of polypyrrole and is formed so as to cover the dielectric oxide film 3. In this case, a part of the dielectric oxide film 3 formed in contact with the anode lead member 2 is exposed from the conductive polymer layer 4. The cathode lead layer 5 covers the conductive polymer layer 4 except for the side where the anode lead member 2 is formed.

  The conductive adhesive 6 is formed on the cathode lead layer 5 and connects the cathode terminal 7 to the cathode lead layer 5. The cathode terminal 7 has one end formed on the conductive adhesive 6 and the other end in contact with the resin 9. The anode terminal 8 is formed such that one end is connected to the anode lead member 2 and the other end is in contact with the resin 9. Resin 9, except for part of cathode terminal 7 and anode terminal 8, has anode body 1, anode lead member 2, dielectric oxide film 3, conductive polymer layer 4, cathode lead layer 5, and conductive adhesive 6. The cathode terminal 7 and the anode terminal 8 are sealed.

  FIG. 2 is a perspective view showing the anode body 1 and the anode lead member 2 shown in FIG. Referring to FIG. 2, anode body 1 has a substantially rectangular parallelepiped shape. The anode body 1 has a thickness T1, a width W1, and a length L1. The thickness T1 is set to 0.5 mm, for example, the width W1 is set to 3.4 mm, for example, and the length L1 is set to 4.2 mm, for example. A part of the anode lead member 2 is embedded in the anode body 1 and is planted on the end face 11 of the anode body 1. The anode lead member 2 has a length L2. The length L2 is composed of a length L21 of the anode lead member 2 embedded in the anode body 1 and a length L22 of the anode lead member 2 exiting from the anode body 1 to the outside. The length L2 is set to, for example, 6.7 mm, the length L21 is set to, for example, 3.0 mm, and the length L22 is set to, for example, 3.7 mm.

  FIG. 3 is a plan view of the anode body 1 and the anode lead member 2 viewed from the direction A shown in FIG. Referring to FIG. 3, end surface 11 of anode body 1 has a substantially rectangular shape including long sides 111 and 112 and short sides 113 and 114.

  The anode lead member 2 has a flat cross-sectional shape composed of two opposing straight lines 21 and 22 and two opposing curves 23 and 24. Each of the curves 23 and 24 has an arc shape, and the two curves 23 and 24 have a shape convex toward the outer periphery of the end face 11. The anode lead member 2 is disposed at a substantially central portion of the end surface 11 so that the two straight lines 21 and 22 are substantially parallel to the long sides 111 and 112 of the end surface 11.

  The anode lead member 2 has a thickness c and a width W2. The distance between the straight line 21 of the anode lead member 2 and the long side 111 of the end face 11 and the distance between the straight line 22 of the anode lead member 2 and the long side 112 of the end face 11 are set to f1. Further, the distance between the curve 23 of the anode lead member 2 and the short side 113 of the end face 11 and the distance between the curve 24 of the anode lead member 2 and the short side 114 of the end face 11 are set to f2.

  The thickness c is set to 0.15 mm, for example, and the width W2 is set to 0.46 mm, for example. As a result, the interval f1 is set to (T1-c) / 2 = (0.5-0.15) /2=0.175 mm. The distance between the curve 23 and the short side 113 and the distance f2 between the curve 24 and the short side 114 are set to (W1-W2) / 2 = (3.4-0.46) /2=1.47 mm. The

FIG. 4 is a cross-sectional view of a wire having a circular cross-sectional shape. Referring to FIG. 4, the wire 20 has a diameter a. The diameter a is larger than the thickness c of the anode lead member 2. Assuming that the cross-sectional area of the wire 20 is S, S = (a / 2) ² × π. The anode lead member 2 has a cross-sectional area substantially equal to the cross-sectional area S.

  The anode lead member 2 is manufactured by pressing the wire 20 so that the circular cross-sectional shape becomes a flat shape. The anode lead member 2 manufactured by pressing the wire 20 has a cross-sectional area substantially equal to the cross-sectional area S.

  FIG. 5 is a process diagram for explaining a method of manufacturing the solid electrolytic capacitor 10 shown in FIG. Referring to FIG. 5, when a series of operations is started, the wire 20 made of niobium and having a circular cross-sectional shape is pressed to produce a wire 30 having a flat cross-sectional shape (step (a)). reference). In this case, the wire 30 has a thickness c and a width W2.

  Thereafter, the pressed wire 30 is cut to a length of 6.7 mm to produce the anode lead member 2, and the niobium metal powder and the produced anode lead member 2 are put into a mold, and the anode lead member 2 is The molded body 40 is produced by pressure molding so as to be embedded to a length of 3.0 mm (see step (b)).

  Subsequently, the anode lead member 2 and the molded body 40 are vacuum-sintered to produce the anode body 1 in which the anode lead member 2 is embedded (see step (c)).

  Thereafter, the anode body 1 and the anode lead member 2 are subjected to electrolytic conversion treatment in a 0.01 to 1.0 wt% phosphoric acid aqueous solution, and a dielectric made of NbO on the entire surface of the anode body 1 and a part of the surface of the anode lead member 2. The body oxide film 3 is formed (see step (d)).

  Then, the conductive polymer layer 4 made of polypyrrole is formed on the dielectric oxide film 3 (see step (e)). Thereafter, a cathode lead layer 5 was formed on the conductive polymer layer 4 (see step (f)), and a conductive adhesive 6 was applied onto the cathode lead layer 5 (see step (g)) and applied. The cathode terminal 7 is bonded to the cathode lead layer 5 with the conductive adhesive 6, and the anode terminal 8 is connected to the anode lead member 2 (see step (h)). Subsequently, the solid electrolytic capacitor 10 is completed by molding with the resin 9 (see step (i)).

  Next, the characteristics of the solid electrolytic capacitor 10 will be described. As a comparative example, a solid electrolytic capacitor using an anode lead member having a circular or square cross-sectional shape was used. FIG. 6 is a plan view of the prototype solid electrolytic capacitor, and FIGS. 7 to 12 are first to sixth side views of the prototype solid electrolytic capacitor, respectively.

  Referring to FIG. 6, electrolytic capacitor 10A according to Comparative Example 1 includes anode body 1 and anode lead member 22A, and electrolytic capacitor 10B according to Comparative Example 2 includes anode body 1 and anode lead member 22B. The electrolytic capacitor 10C according to Comparative Example 3 includes the anode body 1 and the anode lead member 22C, and the electrolytic capacitor 10D according to Comparative Example 4 includes the anode body 1 and the anode lead member 22D. Capacitor 10E includes anode body 1 and anode lead member 22E.

  In the solid electrolytic capacitor 10 according to the present invention and the fixed electrolytic capacitors 10A, 10B, 10C, 10D, and 10E according to Comparative Examples 1 to 5, the anode body 1 has a width of 3.4 mm, a length of 4.2 mm, and a length of 0.5 mm. Has a thickness. The anode lead members 2, 22A, 22B, 22C, 22D, and 22E have a length of 6.7 mm. The anode lead members 2, 22 </ b> A, 22 </ b> B, 22 </ b> C, 22 </ b> D, and 22 </ b> E are embedded in the anode body 1 with a length of 3.0 mm out of a length of 6.7 mm.

Referring to FIG. 7, in solid electrolytic capacitor 10, the distance between anode lead member 2 and the edge of anode body 1 is f. Referring to FIG. 8, in solid electrolytic capacitor 10A, anode lead member 22A has a circular cross-sectional shape. The distance between the edge of the anode lead member 22A and the anode body 1 is f _A.

Referring to FIG. 9, in solid electrolytic capacitor 10B, anode lead member 22B has a circular cross-sectional shape. The distance between the edge of the anode lead member 22B and the anode body 1 is f _B.

Referring to FIG. 10, in solid electrolytic capacitor 10C, anode lead member 22C has a circular cross-sectional shape. The distance between the anode lead member 22C and the edge of the anode body 1 is f _C.

Referring to FIG. 11, in solid electrolytic capacitor 10D, anode lead member 22D has a circular cross-sectional shape. The distance between the edge of the anode lead member 22D and the anode body 1 is f _D.

Referring to FIG. 12, in solid electrolytic capacitor 10E, anode lead member 22E has a rectangular cross-sectional shape. The distance between the edge of the anode lead member 22E and the anode body 1 is f _E.

  A solid electrolytic capacitor 10 according to the present invention includes an anode body 1 and an anode lead member 2 having a cross-sectional dimension of 0.15 mm × 0.46 mm. A solid electrolytic capacitor 10A according to Comparative Example 1 includes an anode body 1 and an anode lead member 22A made of a wire having a diameter of 0.3 mm. A solid electrolytic capacitor 10B according to Comparative Example 2 includes an anode body 1 and an anode lead member 22B made of a wire having a diameter of 0.275 mm. A solid electrolytic capacitor 10C according to Comparative Example 3 includes an anode body 1 and an anode lead member 22C made of a wire having a diameter of 0.24 mm. A solid electrolytic capacitor 10D according to Comparative Example 4 includes an anode body 1 and an anode lead member 22D made of a wire having a diameter of 0.20 mm. A solid electrolytic capacitor 10E according to Comparative Example 5 includes an anode body 1 and an anode lead member 22E having a cross-sectional dimension of 0.12 mm × 1.5 mm.

  Thus, the solid electrolytic capacitor 10 according to the present invention and the solid electrolytic capacitors 10A, 10B, 10C, 10D, and 10E according to Comparative Examples 1 to 5 are manufactured by changing the cross-sectional shape of the anode lead member embedded in the same anode body 1. Solid electrolytic capacitor.

  Table 1 shows the dimensions, yield, capacitance, and equivalent series resistance of the solid electrolytic capacitor 10 according to the present invention and the solid electrolytic capacitors 10A, 10B, 10C, 10D, and 10E according to Comparative Examples 1 to 5.

  In Table 1, the resistance value of 5.5 mm in length means anode lead members 2, 22 </ b> A, 22 </ b> B whose length from one end embedded in the anode body 1 is 5.5 mm as shown in FIG. 6. , 22C, 22D, and 22E.

Referring to Table 2, in solid electrolytic capacitor 10 according to the present invention, edge portion dimension f is 0.175 mm. Moreover, the solid electrolytic capacitor 10A according to the comparative example 1 to 4, 10B, 10C, in 10D, the dimensions _f A of the edge _{portion, f B, f C, f} D is the anode lead member 22A, 22B, 22C, 22D of the diameter Increases to 0.10 mm, 0.113 mm, 0.13 mm, and 0.15 mm as the diameter decreases from φ0.3 mm to φ0.20 mm.

  In the solid electrolytic capacitor 10 according to the present invention, the dimension f of the edge portion is as large as 0.175 mm because the anode lead member 2 is a flat type produced by pressing a circular wire 20 having a diameter of φ0.3 mm. This is because the cross-sectional shape is as follows. That is, since the anode lead member 2 after the press working has a cross-sectional shape having a thickness c of 0.15 mm and a width W2 of 0.46 mm, the dimension f of the edge portion is a circular shape having a diameter of 0.15 mm. This is because it is equivalent to burying the wire in the anode body 1.

In the solid electrolytic capacitor 10 according to the present invention and the solid electrolytic capacitors 10A, 10B, 10C, and 10D according to Comparative Examples 1 to 4, the dimensions f, f _A , f _B , f _C , and f _D of the edge portions are from 0.1 mm to 0 As it grows to .175 mm, the yield improves to 18%, 36%, 48%, 78% and 96%.

On the other hand, in the solid electrolytic capacitor 10E of Comparative Example 5, the dimensions _{f E} of the edge portion despite the largest and 0.19 mm, yield is the lowest 8%. This is because the solid electrolytic capacitor 10E according to Comparative Example 5 includes the anode lead member having a square cross-sectional shape, and thus cracks are generated from the vicinity of the square corners when the anode body 1 and the anode lead member 22E are sintered. This is because a leakage current abnormality occurred.

  FIG. 13 is a diagram illustrating the relationship between the yield and the size of the edge portion. In FIG. 13, the vertical axis represents the yield, and the horizontal axis represents the edge dimension. Further, the circles plot the relationship between the yield and the edge size in the solid electrolytic capacitor 10 according to the present invention and the solid electrolytic capacitors 10A, 10B, 10C, and 10D according to Comparative Examples 1 to 4.

Referring to FIG. 13, the relationship between yield and edge dimension is represented by a straight line k1. The solid electrolytic capacitor 10 according to the present invention and the solid electrolytic capacitors 10A, 10B, 10C, and 10D according to Comparative Examples 1 to 4 include anode lead members 2, 22A, 22B, 22C, and 22D having round cross-sectional shapes. Therefore, when the anode lead member has a round cross-sectional shape, the yield is improved substantially in proportion to the edge dimension f. As a result, the edge dimensions f, f _A , f _B , f _C , and f _D are yield dimensions that determine the yield when a solid electrolytic capacitor is manufactured.

  Again referring to Table 2, in the solid electrolytic capacitors 10A, 10B, 10C, and 10D according to Comparative Examples 1 to 4, the equivalent series resistance is such that the diameters of the anode lead members 22A, 22B, 22C, and 22D are from φ0.30 mm. As it decreases to φ0.20 mm, it increases to 30.9 mΩ, 34.0 mΩ, 38.1 mΩ, and 43.8 mΩ. This is mainly due to the fact that the resistance value at a length of 5.5 mm increases as the diameter decreases.

  On the other hand, in the solid electrolytic capacitor 10 according to the present invention, the equivalent series resistance is 30.7 mΩ, which is substantially the same as the equivalent series resistance of the solid electrolytic capacitor 10A according to Comparative Example 1 using a wire having a diameter of 0.3 mm. is there. As described above, when the anode lead member 2 having a flat cross-sectional shape is used, the equivalent series resistance does not increase because the anode body 1 and the anode lead member 2 are pressed by pressing the cross-sectional shape into a flat shape. This is because the contact area increases.

  The solid electrolytic capacitor 10 according to the present invention and the solid electrolytic capacitors 10A, 10B, 10C, 10D, and 10E according to Comparative Examples 1 to 5 have substantially the same capacity.

  Therefore, by pressing the cross-sectional shape from a circular shape to a flat shape, an increase in equivalent series resistance can be suppressed, and the yield can be improved while maintaining the capacity.

  FIG. 14 is a view for explaining the arrangement range of the anode lead member 2. Referring to FIG. 14, end surface 11 of anode body 1 has an inner peripheral region 115. The inner peripheral region 115 has a width W3 and a thickness T2, and has a distance equal to the dimension f of the edge portion between the outer peripheral edge (= long side 111, 112 and short side 113, 114) of the end face 11. The width W3 is determined by W3 = W1-2f, and the thickness T2 is determined by T2 = T1-2f.

  When the cross-sectional dimensions (thickness c and width W2) of the anode lead member 2 are equal to or smaller than the dimensions (thickness T2 and width W1) of the inner peripheral region 115, the anode lead member 2 is implanted in the inner peripheral region 115. The distance between the anode lead member 2 and the outer peripheral edge (= long side 111, 112 and short side 113, 114) of the end surface 11 of the anode body 1 is equal to or greater than the edge dimension f. As a result, the yield of the solid electrolytic capacitor is equal to or higher than the yield determined by the edge size f (see the straight line k1 in FIG. 13). For example, when the edge dimension f is 0.16 mm, the distance between the anode lead member 2 and the outer peripheral edge (= long side 111, 112 and short side 113, 114) of the end surface 11 of the anode body 1 is 0.16 mm or more. Thus, the yield of the solid electrolytic capacitor is equal to or higher than the yield (= 85%) when the edge dimension f is 0.16 mm.

  On the other hand, when the cross-sectional dimensions (thickness c and width W2) of anode lead member 2 are larger than the dimensions (thickness T2 and width W1) of inner peripheral region 115, anode lead member 2 protrudes from inner peripheral region 115. The distance between the anode lead member 2 and the outer peripheral edge (= long side 111, 112 and short side 113, 114) of the end surface 11 of the anode body 1 is shorter than the edge dimension f. As a result, the yield of the solid electrolytic capacitor is lower than the yield determined by the edge size f. For example, when the anode lead member 2 is made of a circular wire having a diameter larger than the thickness T2 of the inner peripheral region 115, when the anode lead member 2 is planted on the end surface 11, the end surfaces of the anode lead member 2 and the anode body 1 11 is shorter than the edge dimension f, and the yield of the solid electrolytic capacitor is larger than the yield determined by the edge dimension f. Lower.

  Therefore, if the wire having a circular cross-sectional shape is pressed into a wire having a flat cross-sectional shape so that the anode lead member 2 is planted in the inner peripheral region 115 of the end surface 11, the above-described operation is performed. In addition, the yield of the solid electrolytic capacitor is improved.

  Therefore, the present invention is characterized in that the anode lead member 2 is planted in the inner peripheral region 115 determined in consideration of the yield dimension (= edge dimension f) that determines the yield. With this feature, the yield of the solid electrolytic capacitor can be stably improved.

  Whether or not the anode lead member 2 is planted in the inner peripheral region 115 is determined by the thickness T1 of the anode body 1, the cross-sectional dimension (thickness c) of the anode lead member 2, and the edge dimension f. The As is apparent from FIG. 14, T1 = T2 + 2f is established. If the thickness c of the anode lead member 2 is equal to or less than the thickness T2 of the inner peripheral region 115 (c ≦ T2), the anode lead member 2 is planted in the inner peripheral region 115. That is, if c ≦ T1-2f is established, the anode lead member 2 is planted in the inner peripheral region 115. Whether or not the anode lead member 2 is planted in the inner peripheral region 115 may be determined based on the short side dimensions (thicknesses T1 and T2) of the anode body 1 and the inner peripheral region 115.

  Therefore, in the present invention, the anode lead member 2 is manufactured by pressing a wire having a circular cross-sectional shape into a wire having a flat cross-sectional shape so that c ≦ T1-2f is satisfied.

  The solid electrolytic capacitor 10 tends to be thin, and it is necessary to increase the edge dimension f in order to achieve a high yield. Therefore, the cross-sectional shape is preferably set so that c = T1-2f is established. The anode lead member 2 is manufactured by pressing a wire having a circular shape into a wire having a flat cross-sectional shape.

  If the thickness of the solid electrolytic capacitor 10 is reduced, the diameter of the wire before press processing becomes larger than the thickness T2 of the inner peripheral region 115, so that the diameter larger than the thickness T2 of the inner peripheral region 115 is increased. The anode lead member 2 is manufactured by pressing a wire having a flat cross-sectional shape. In this case, the cross-sectional area of the wire is almost the same before and after pressing.

  In the present invention, the cross-sectional shape of the anode lead member 2 may have a shape other than the above-described shape, and may include two opposing straight lines and a curve connecting the two straight lines. Good.

  In the above description, the conductive polymer layer 4 is made of polypyrrole. However, the present invention is not limited to this, and the conductive polymer layer 4 is made of polythiophene, poly (3,4-ethylenedioxy). Thiophene), conductive polymers such as polyacetylene and polyaniline, or organic semiconductors such as TCNQ (7,7,8,8-tetracyanoquinodimethane) complex salt.

  Further, in the above description, the anode lead member 2 is made of niobium. However, the present invention is not limited to this, and the anode lead member 2 may be made of tantalum. It only has to consist of.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  The present invention is applied to a solid electrolytic capacitor capable of stably improving the yield when producing a solid electrolytic capacitor.

It is sectional drawing which shows the structure of the solid electrolytic capacitor by embodiment of this invention. It is a perspective view which shows the anode body and anode lead member which are shown in FIG. It is a top view of the anode body and anode lead member which were seen from the A direction shown in FIG. It is sectional drawing of the wire which has circular cross-sectional shape. It is process drawing for demonstrating the manufacturing method of the solid electrolytic capacitor shown in FIG. It is a top view of the prototype solid electrolytic capacitor. It is the 1st side view of the prototype solid electrolytic capacitor. It is the 2nd side view of the prototype solid electrolytic capacitor. It is the 3rd side view of the prototype solid electrolytic capacitor. It is a 4th side view of the prototype solid electrolytic capacitor. It is a 5th side view of the prototype solid electrolytic capacitor. It is a 6th side view of the prototype solid electrolytic capacitor. It is a figure which shows the relationship between a yield and the dimension of an edge part. It is a figure for demonstrating the arrangement | positioning range of an anode lead member. It is a perspective view which shows the anode body and anode lead member of the conventional solid electrolytic capacitor.

Explanation of symbols

  1,100 Anode body, 2, 22A, 22B, 22C, 22D, 22E, 110 Anode body lead, 3 Dielectric oxide film, 4 Conductive polymer layer, 5 Cathode extraction layer, 6 Conductive adhesive, 7 Cathode terminal , 8 anode terminal, 9 resin, 10, 10A, 10B, 10C, 10D, 10E solid electrolytic capacitor, 20, 30 wire, 40 molded body.

Claims (9)

An anode body made of a sintered body of valve action metal,
A dielectric film formed in contact with the anode body;
A solid electrolyte layer formed in contact with the dielectric film;
A cathode lead layer formed in contact with the solid electrolyte layer;
An anode lead member planted on one end face of the anode body, a part of which is embedded in the anode body,
The anode lead member has a cross-sectional shape composed of two opposing straight lines and a curve connecting the two straight lines at the one end face, and a distance between the outer peripheral edge of the one end face produces a solid electrolytic capacitor A solid electrolytic capacitor that is planted in the inner peripheral area set to the yield dimension that determines the yield when. The one end surface has a quadrangular shape composed of a long side and a short side,
The solid electrolytic capacitor according to claim 1, wherein the anode lead member is planted in the inner peripheral region so that the two straight lines are substantially parallel to the long side.   3. The solid electrolytic capacitor according to claim 2, wherein c ≦ T−2f is established, where c is the distance between the two straight lines, f is the yield dimension, and T is the length of the short side.   The solid electrolytic capacitor according to claim 3, wherein c is substantially equal to T-2f. When S is a circular area having a diameter larger than the T-2f,
The solid electrolytic capacitor according to claim 3, wherein the anode lead member has a cross-sectional area substantially equal to the area S at the one end surface.   6. The solid electrolytic capacitor according to claim 1, wherein the anode lead member has a cross-sectional shape in which the two straight lines are connected by two opposing curves.   The solid electrolytic capacitor according to claim 6, wherein the two curved lines have a shape that is convex toward the outer periphery of the one end face.   The solid electrolytic capacitor according to claim 1, wherein the anode body includes niobium.   The solid electrolytic capacitor according to claim 1, wherein the anode lead member is made of niobium or tantalum.

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