JPH0555095A - Solid electrolytic capacitor and manufacture thereof - Google Patents

Abstract

PURPOSE:To facilitate a current flowing step by connecting an abode lead of a capacitor element to outer anode lead of a first lead, connecting the center of the outer cathode lead of a second lead to the element, and conducting the anode lead and outer cathode lead of each capacitor. CONSTITUTION:A first lead coupler 7 in which outer anode leads 3 of a plurality of solid electrolytic capacitors (a) are secured to paper insulating holder 6 at a constant pitch, and a second lead coupler 9 in which an outer cathode lead 4 is secured to a conductive holder 8 of a metal plate, are positioned to be superposed. A capacitor element 1 is soldered to a center 4a of the lead 4. Thereafter, a sheath resin material 7 is formed. A voltage is applied between the lead 3 and the lead 4 through the holder 8 thereby to perform aging and inspect characteristics. Thus, decision of propriety of a product, sorting are facilitated, a manufacturing facility after an inspecting step can be easily simplified, reduced in cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a solid electrolytic capacitor having a three-terminal structure, and more particularly to a method for manufacturing a solid electrolytic capacitor in an aging process or a characteristic inspection process.

[0002]

2. Description of the Related Art A solid electrolytic capacitor is a resin-clad type in which the main part is resin-clad, and generally has a two-terminal structure in which two leads, an anode and a cathode, are led out from a packaging resin material. To mount this solid electrolytic capacitor on a printed circuit board, insert the corresponding anode and cathode leads into the mounting holes formed at the two capacitor mounting positions on the printed circuit board and solder it to the conductive land of the printed circuit board. Done in. However, when mounting the solid electrolytic capacitor having a two-terminal structure, there is a risk of erroneous mounting in which the polarities of the two leads are mistakenly inserted into the two mounting holes of the printed circuit board and soldered as it is.

Therefore, a solid electrolytic capacitor (b) having a three-terminal structure as shown in FIG. 7 has been put into practical use as a solid electrolytic capacitor for avoiding the risk of erroneous mounting. This is done by welding an external anode lead (3), which is usually deformed into a hook shape, to the anode lead (2) that is erected in the capacitor element (1), and a 180 ° symmetrical portion on the outer circumference of the capacitor element (1). 2 external cathode leads (15) (1
6) is connected with solder (21), and the main part including the capacitor element (1) is covered with the exterior resin material (5). The capacitor element (1) is formed by press-molding and sintering metal powder having a valve action, such as tantalum, around an anode lead (2) made of a metal having the same valve action. The capacitor element (1) is subjected to a chemical conversion treatment or the like to form a cathode electrode extraction layer on the surface thereof, and the tip portions of the external cathode leads (15) and (16) are soldered thereto.
Two external cathode leads (15, 16) are arranged in parallel on both sides of one external anode lead (3) at the same pitch P.

FIG. 8 is a perspective view when the solid electrolytic capacitor (b) is mounted on the printed board (17). The printed circuit board (17) has three mounting holes (18) to (20) in a straight line on the capacitor mounting surface at a constant pitch P. The central mounting hole (18) is for the anode, and the mounting holes (19) (20) on both sides are for the cathode. Each mounting hole (1
Conductive lands (not shown) are formed around 8) to (20), and the conductive lands of the mounting holes (19) (20) on both sides are electrically connected. The solid electrolytic capacitor (b) is mounted on the printed circuit board (17) by inserting the three lead terminals into the corresponding three mounting holes (18) to (20) and soldering on the back surface of the printed circuit board (17). To be implemented. At this time, even if the horizontal mounting angle of the solid electrolytic capacitor (b) is reversed by 180 °, the left and right polarities are the same, so there is no risk of erroneous mounting by inserting the polarities incorrectly.

The solid electrolytic capacitor (b) is manufactured in the state of the first and second lead coupling bodies (1) as shown in FIG. 9, for example, and the characteristics are inspected. First lead part (22)
Is a structure in which the base ends of a plurality of external anode leads (2) are connected and integrated by a long metal conductive holder (23), and each external anode lead (3) has a capacitor element (1). The anode lead (2) is welded. The second lead portion (24) is formed by connecting a plurality of pairs of external cathode leads (15, 16) at their base ends with an insulating holder (25) such as a long paper. With the capacitor element (1) inserted between the pair of external cathode leads (15) (16) of the second lead portion (24) and the lead connection body (l) being positioned, Corresponding external cathode lead (1
5) Solder (16), and then form the exterior resin material (5) by the dip method. The solid electrolytic capacitor (b) thus formed in a batch is sent to the aging step by energizing for a long time and the individual characteristic inspection step,
Each lead is cut into individual products.

For aging of the solid electrolytic capacitor (b), as shown in FIG. 9, a positive voltage is applied to the external anode lead (3) through the conductive holder (23) to make a pair of external cathode leads (15). (16) A negative voltage is applied to (16) and electricity is applied for a predetermined time. Further, the characteristic inspection step is also performed by applying a voltage similarly to the aging step. That is, the two external cathode leads (15) (16) of the solid electrolytic capacitor (b) are soldered to the capacitor element (1) under the same conditions, but they are not always soldered well. However, there is a possibility that a defective connection may occur on one side. Therefore, for aging and property inspection, independent inspection probes (26) are applied to the two external cathode leads (15) (16) to energize. Further, in order to enable the current to flow in this manner, the external cathode leads (15) (16) are connected to the insulating holder (25) to be electrically independent.

[0007]

The method for manufacturing a solid electrolytic capacitor in the state of the lead-coupled body shown in FIG. 9 has an advantage of being excellent in mass productivity. There was a complication. That is, since it is necessary to perform the characteristic inspection by applying the inspection probe to each of the pair of external cathode leads, the number of inspection probes increases, the wiring thereof becomes complicated, the inspection equipment becomes complicated, and the manufacturing cost becomes high. In addition, the characteristic inspection result of each of the two external cathode leads of one solid electrolytic capacitor is judged, and the processing is divided into the non-defective product and the defective product. However, this process has a lot of inspection data and is troublesome. It's easy to make a mistake.

The present invention has been made in view of the above problems. An object of the present invention is to provide a solid-state charge capacitor having a three-terminal structure capable of simplifying an energization process such as a characteristic inspection in terms of equipment and work. It is to provide a manufacturing method.

[0009]

SUMMARY OF THE INVENTION According to the present invention, an external anode lead connected to an anode lead set up in a capacitor element made of a metal having a valve action, and an intermediate portion connected to a surface of the capacitor element, both ends of which are connected. A solid electrolytic capacitor having a substantially U-shaped external cathode lead whose parts extend in parallel to both sides of the external anode lead at a constant pitch, and an exterior resin material covering a main part including a capacitor element, and a manufacturing method thereof. In order to achieve the above-mentioned object, the anode lead of the capacitor element is attached to each external anode lead of the first lead part in which the tips of the external anode leads of the plurality of solid electrolytic capacitors are connected by a long insulating or conductive holder. The second lead part, which is connected and has both ends of the external cathode leads of a plurality of solid electrolytic capacitors connected by a long conductive or insulating holder. The central portion of each external cathode lead of the second lead portion is connected to the capacitor element in a state of being positioned and superposed on the first lead portion, and an exterior resin material is formed, and then each solid electrolyte is inserted through the conductive holder. The method is characterized by including the step of energizing between the anode lead and the external cathode lead of the capacitor.

[0010]

By connecting the middle portion of the substantially U-shaped external cathode lead to the capacitor element and leading both ends to both sides of the external anode lead as two terminals of the same polarity, a three-terminal structure is obtained. The characteristic inspection can be performed by applying the inspection probe to any of the external cathode leads of the terminal, and therefore, the inspection probe with less characteristic inspection can be easily and accurately performed. This single characteristic inspection data simplifies post-processing such as quality determination of the solid electrolytic capacitor based on the inspection result. Further, as the second lead portion in which the external cathode leads of the two terminals are connected by the conductive holder and integrated, a lead frame which is advantageous in manufacturing cost can be used.

[0011]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3 show the first embodiment, FIGS. 4 and 5 show partially modified examples thereof, and FIG. 6 shows the second embodiment.
An example of is shown. In addition, the same or corresponding portions will be denoted by the same reference symbols throughout the drawings including FIG. 7, and description thereof will be omitted.

The solid electrolytic capacitor (a) shown in FIGS. 1 and 2 has a three-terminal structure, and the intermediate portion (4a) of the substantially U-shaped external cathode lead (4) is soldered to the surface of the capacitor element (1). Connect at (21), straight ends (4b)
(4c) is formed by extending in parallel to both sides of the external anode lead (3) at a constant pitch P. The intermediate portion (4a) of the external cathode lead (4) is, for example, as shown in FIG. 3, formed in a gate shape extending over the side surface and the top surface of the capacitor element (1) and is formed between the capacitor element (1). The solder (21) is poured into the appropriate gap (g) to connect the two. The gap (g) is provided so that the change in the capacitance of the capacitor element (1) due to the change in the type of the solid electrolytic capacitor (a) can correspond to the size change. That is, the middle part (4
If a) is set to a size that matches the maximum size of the capacitor element (1), various kinds of smaller size capacitor elements are soldered to the middle part (4a) from the largest size. One type of external cathode lead (4) is commonly used for manufacturing various types of solid electrolytic capacitors. If this intermediate portion (4a) is connected in a direction crossing the center of the top surface of the capacitor element (1), both ends (4b) (4c) and the external anode lead (3) along the center line of the capacitor element (1) The terminals are aligned,
A solid electrolytic capacitor (a) that can be mounted on the printed board (17) of FIG. 8 is obtained. This solid electrolytic capacitor (a)
Is manufactured using the lead connecting body (L) including the following first and second lead portions (7) and (9).

The first lead portion (7) is formed by fixing the base end portions of a plurality of external anode leads (3) to a paper-made insulating holder (6) at a constant pitch. The anode lead (2) of the capacitor element (1) is welded to the tip of each external anode lead (3). The second lead part (9) is formed by connecting both ends of a plurality of substantially U-shaped external cathode leads (4) to a conductive holder (8) made of a metal plate. In the drawing, the holder (8) and the external cathode are connected. The case where the leads (4) are integrated is shown. The first and second lead parts (7) and (9) are positioned and overlapped with each other, and the capacitor element (1) is inserted into the intermediate part (4a) of the external cathode lead (4). The part (4a) and the capacitor element (1) are soldered, and then the exterior resin material (5) is formed. Then, aging and characteristic inspection of each solid electrolytic capacitor (a) are performed.

For example, as shown in FIG. 1, a positive voltage is applied to each external anode lead (3) and a negative voltage is applied to each external cathode lead (4) to perform aging for a predetermined time. In this case, a part of the external anode lead (3) is projected from the lower end of the insulating holder (6), and the projection (3 ′) is brought into contact with a positive electrode plate (not shown),
By applying a positive voltage to each external anode lead (3) and applying a negative voltage to each external cathode lead (4) through the conductive holder (8), aging can be performed with simple equipment. It

The characteristic inspection is performed by applying a positive voltage to each external anode lead (3) independently and by applying a negative voltage to each external cathode lead (4) through the conductive holder (8). .. That is, the external cathode lead (4), which serves as the two terminals of one solid electrolytic capacitor (a), is a conventional two, and both ends (4b) (4)
The result is the same when the inspection probe is applied to any of c) and the characteristics are inspected. Therefore, if a voltage is applied according to the procedure shown in FIG. 1, the characteristic inspection of each solid electrolytic capacitor (a) is performed, and the quality is determined by one inspection data. The number of inspection probes (26) used in this inspection equipment is the same as the number of external anode leads (3), which is about half of the conventional one, which is small.
Therefore, the inspection equipment is simplified and the cost is reduced. When the characteristic inspection is completed, each lead is cut and individual solid electrolytic capacitors (a) are obtained.

4 and 5 show an example in which the intermediate portion (4a) of the external cathode lead (4) of the solid electrolytic capacitor (a) is modified. The intermediate portion (4a) has a semi-arcuate shape connected to the peripheral surface of the cylindrical capacitor element (1) by solder (21). The radius of curvature of the intermediate portion (4a) is set to be about the radius of the largest size capacitor element (1), so that the peripheral surface of various types of capacitor elements (1) is soldered to the intermediate portion (4a). The external cathode lead (4) can be commonly used for various kinds of solid electrolytic capacitors.

Next, a second embodiment shown in FIG. 6 will be described. This is different from the first embodiment in that a plurality of external anode leads (3) are connected by a metal plate conductive holder (10) to form a first lead portion (11), and The external cathode lead (4) is connected by an insulating holder (12) made of paper to form the second lead portion (13). The first and second lead parts (11) and (13) are overlapped, and the capacitor element (1) and the external cathode lead (4) are connected by soldering,
The exterior resin material (5) is formed. Subsequent aging is
For example, the protruding portion (4 ') of the external cathode lead (4) protruding from the lower end of the insulating holder (12) is brought into contact with a negative electrode plate (not shown), and each of them is inserted through the conductive holder (10). A positive voltage may be applied to the external anode lead (3). Further, the characteristic inspection may be performed by applying a positive voltage to the conductive holder (10) and applying a negative voltage to each external cathode lead (4). In this case, the number of the inspection probes (26) is also the number of the external cathode leads (4), that is, about half that of the conventional one, and the inspection equipment is simplified and the cost is reduced.

[0018]

According to the present invention, the characteristic inspection is performed by applying the inspection probe to either of the two ends of the substantially U-shaped external cathode lead forming the cathode 2 terminal of the solid electrolytic capacitor having the three-terminal structure. However, since the result is the same, it can be executed easily and accurately with a test probe with few characteristic tests.
Moreover, there is an effect that the quality judgment and the quality selection of the product based on the inspection result are facilitated, and the simplification of the manufacturing equipment after the inspection process and the realization of the cost reduction are facilitated. Further, it is possible to manufacture by using a lead frame in which substantially U-shaped external cathode leads to be two terminals are connected by a conductive holder and integrated.
By using such a lead frame, it is possible to further reduce the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a partial front view of a lead assembly showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG.

3 is a partial front view of the lead assembly of FIG. 1 when assembled.

4 is a partial front view showing a partially modified example of the external cathode lead of the lead assembly of FIG.

5 is a partially enlarged plan view of FIG.

FIG. 6 is a partial front view of a lead assembly showing a second embodiment of the present invention.

FIG. 7 is a sectional view of a solid electrolytic capacitor having a three-terminal structure.

FIG. 8 is a perspective view of the capacitor shown in FIG. 7 mounted on a printed circuit board.

9 is a partial front view of a lead assembly for manufacturing the capacitor of FIG. 7;

[Explanation of symbols]

 a Solid electrolytic capacitor 1 Capacitor element 2 Anode lead 3 External anode lead 4 External cathode lead terminal 4a Central part 5 Exterior resin material 6 Insulating holder 7 1st lead part 8 Conductive holder 9 2nd lead part 10 Conductive holder 11 1st 1 lead part 12 insulating holder 13 second lead part

Claims (4)

[Claims] 1. An external anode lead connected to an anode lead embedded in a capacitor element made of a metal having a valve action, an intermediate portion connected to a surface of the capacitor element, and both end portions of both sides of the external anode lead. A solid electrolytic capacitor comprising a substantially U-shaped external cathode lead extending in parallel at a constant pitch, and an exterior resin material covering a main part including a capacitor element. 2. The solid electrolytic capacitor according to claim 1, wherein the intermediate portion of the external cathode lead is connected to the top surface of the capacitor element. 3. The solid electrolytic capacitor according to claim 1, wherein an intermediate portion of the external cathode lead is connected to a peripheral surface of the capacitor element. 4. An external anode lead connected to an anode lead embedded in a capacitor element made of a metal having a valve action, an intermediate portion connected to a surface of the capacitor element, and both end portions of both sides of the external anode lead. When manufacturing a solid electrolytic capacitor provided with a substantially U-shaped external cathode lead extending in parallel at a constant pitch and an exterior resin material covering a main part including a capacitor element, the external anode lead of a plurality of solid electrolytic capacitors is Connect the anode lead of the capacitor element to each external anode lead of the first lead assembly with the tip connected by a long insulating or conductive holder, and extend both tips of the external cathode lead of multiple solid electrolytic capacitors. In a state where the second lead connecting body connected by a lengthy conductive or insulating holder is positioned and superposed on the first lead connecting body, A step of connecting the central portion of each external cathode lead of the lead connection body to a capacitor element, forming an exterior resin material, and then conducting electricity between the anode lead and the external cathode lead of each solid electrolytic capacitor through the conductive holder. A method of manufacturing a solid electrolytic capacitor, comprising: