JP2003124070A - Structure of packaged electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately position both lead terminals 1, 2 of a capacitor element 3 of a solid electrolytic capacitor in a lateral direction, to reduce the widthwise dimension W, to reduce in size and weight and to increase the capacitance when the size is determined, in the electrolytic capacitor having the capacitor element 3 arranged between an anode lead terminal 1 and a cathode lead terminal 2 and the entirety is sealed by a package 7 made of a synthetic resin. SOLUTION: A groove 8 is provided on the side face 3a of the capacitor element 3, and a protrusion 9 provided at the cathode lead terminal 2 is engaged with the groove 8 to thereby position the element 3 in the widthwise direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a so-called package type solid electrolytic capacitor which is a solid electrolytic capacitor such as a tantalum electrolytic capacitor in which a capacitor element portion is packaged with a synthetic resin.

[0002]

2. Description of the Related Art Conventionally, a package type solid electrolytic capacitor of this type is described in Japanese Patent Application Laid-Open No. 6-20891, and is constructed as shown in FIGS.

That is, the anode lead terminal 1 made of a metal plate
And a cathode lead terminal 2 which is also made of a metal plate, are arranged in a straight line so as to face each other, a capacitor element 3 is arranged between them, and an anode rod 4 protruding from one end face of the capacitor element 3 is arranged. While being fixed to the tip of the anode lead terminal 1 so as to be electrically connected by spot welding or the like, the tip of the cathode lead terminal 2 is electrically conductive paste 6 to the cathode film 5 on the surface of the capacitor element 3. After electrically connecting them by adhesion, and sealing the whole with a package body 7 made of synthetic resin, the portions of the lead terminals 1 and 2 protruding from the package body 7 are packaged. 7 is bent toward the lower surface.

Further, the solid electrolytic capacitor having this structure is
The capacitor element 3 is supplied to both lead terminals 1 and 2 arranged so as to face each other in a straight line, and the anode rod 4 in this capacitor element 3 is electrically connected to the anode lead terminal 1 by spot welding or the like. While connecting, the cathode film 5 of the capacitor element 3 is electrically connected to the cathode lead terminal 2 by adhesion with the conductive paste 6, and then the whole is sealed with the package body 7.

[0005]

In this manufacturing method, when the capacitor element 3 is supplied to the lead terminals 1 and 2, the capacitor element 3 is placed on the center line of the width method of the lead terminals 1 and 2. Correct positioning is necessary for narrowing the width dimension W in the solid electrolytic capacitor as a product.

This is because the capacitor element 3 is displaced in the width direction of the lead terminals 1 and 2 when the entire capacitor element 3 is sealed by the package body 7.
The width dimension W of the package body 7 must be increased by the amount of this deviation, and the width dimension W of the package body 7 must be increased.
Is determined, the capacitor element 3 must be reduced in size, and the capacitance cannot be increased.

Conventionally, the above-mentioned positioning in the width direction has been incorporated in a device for automatically supplying a capacitor element to both the leads 1 and 2. Then, the higher the positioning accuracy in the width direction is, the more complicated and high the cost of the automatic supply device is unavoidable, and the supply speed to the lead terminals 1 and 2 of the capacitor element 3 and the manufacturing speed are increased. If the positioning accuracy in the width direction is lowered in order to increase the manufacturing speed, the width dimension W of the product must be increased by that much, and the width of the package body 7 must be increased. When the dimension W is determined, there is a problem that the capacitor element 3 must be made small and the capacitance cannot be made large.

Further, the cathode lead terminal and the cathode film of the capacitor element are electrically connected to each other by an adhesive connection using a conductive paste, and since the connection strength is low, this portion causes a little stress during the manufacturing process. There is also a problem that the rate of occurrence of defective products during manufacturing is high because the wire is disconnected at.

On the other hand, when supplying the capacitor element 3 to both the lead terminals 1 and 2, it is necessary to properly position the lead terminals 1 and 2 in the longitudinal direction. Since the positioning in the longitudinal direction is performed together with the positioning in the width direction by the automatic feeding device, the above problem is further promoted.

The present invention has a technical problem to solve these problems.

[0011]

In order to achieve this technical object, the first aspect of the present invention is that "a capacitor element is provided between an anode lead terminal and a cathode lead terminal, which are arranged to face each other. An anode rod protruding from one end surface is fixed to the anode lead terminal, and the cathode film on the side surface is arranged so as to be electrically connected to the cathode lead terminal with a conductive paste, and these are entirely made of synthetic resin. In the solid electrolytic capacitor hermetically sealed by the package body, a concave groove is formed on the side surface of the capacitor element so that the projection provided on the cathode lead terminal fits and engages with the side surface of the capacitor element so as to extend in the longitudinal direction of the cathode lead terminal. It is characterized by that.

[0012] According to a second aspect of the present invention, "a capacitor element is provided between an anode lead terminal and a cathode lead terminal which are arranged opposite to each other, and an anode rod protruding from one end surface of the capacitor element is provided on the anode lead terminal. Solid electrolytic capacitor, which is fixed to the cathode side surface of the cathode lead terminal so that the cathode film is electrically connected to the cathode lead terminal by a conductive paste, and the whole body is hermetically sealed in a synthetic resin package. In the above, the side surface of the capacitor element is provided with a recess into which the projection provided on the cathode lead terminal fits and engages. ”

[0013]

According to the present invention, the positioning of the capacitor element in the width direction with respect to both lead terminals is performed by fitting the projection provided on the cathode lead terminal into the recessed groove provided on the capacitor element. It is possible to automatically and accurately perform the blank engagement, and moreover, it is possible to reliably improve the connection strength between the cathode film of the capacitor element and the cathode lead terminal by the conductive paste, by the fit engagement.

Further, according to the second aspect, the positioning of the capacitor element in the width direction and the longitudinal direction with respect to both lead terminals is performed by the cathode lead terminal to the recess provided in the capacitor element. It can be done automatically and accurately by the fitting engagement of the provided protrusion, and the connection strength of the conductive paste between the cathode film of the capacitor element and the cathode lead terminal can be secured by the fitting engagement described above. Can be improved.

Therefore, according to the present invention, the width dimension of the solid electrolytic capacitor can be reduced without slowing down the manufacturing speed.
The size of the solid electrolytic capacitor can be reduced, and the size and weight of the solid electrolytic capacitor can be reduced.If the size of the solid electrolytic capacitor is determined, the capacitor element can be enlarged to increase the capacity. Moreover, it has the effect of reducing the incidence of defective products during manufacturing.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment.

In the first embodiment, "anode lead terminal 1 made of a metal plate and a cathode lead terminal 2 also made of a metal plate are used.
And are arranged so as to face each other on a straight line in a plan view,
In the meantime, the capacitor element 3 is arranged, and the anode rod 4 projecting from one end surface of the capacitor element 3 is fixed to the tip of the anode lead terminal 1 so as to be electrically connected thereto by spot welding or the like. The tip of the cathode lead terminal 2 is electrically connected to the cathode film 5 on one side surface 3a of the capacitor element 3 by adhesion with a conductive paste 6, and the whole thereof is made of a synthetic resin package. A solid electrolytic capacitor obtained by sealing the body 7 and then bending the portions of the lead terminals 1 and 2 projecting from the package 7 toward the lower surface of the package 7. In “,” one side face of the capacitor element 2 of the cathode lead terminal 2 is provided while a recessed groove 8 is provided on one side face 3 a of the capacitor element 3 so as to extend in the longitudinal direction of the cathode lead terminal 2. A protrusion 9 is provided by denting the lower surface at a portion where 3a comes into contact, and the protrusion 9 is used as the capacitor element 3
It fits and engages with the recessed groove 8 in. ".

With this configuration, the positioning of the capacitor element 3 in the width direction with respect to the lead terminals 1 and 2 is performed by the projection 9 provided on the cathode lead terminal 2 into the recessed groove 8 provided on the capacitor element 3. It can be done automatically and accurately by the fitting engagement.

The fitting engagement of the projection 9 with the recessed groove 8 can support a part of the stress acting on the connecting portion between the capacitor element 3 and the cathode lead terminal 2, and at the same time, the conductive paste 6 can be used. Since the adhesive area can be increased, the electrical connection strength of the conductive paste 6 can be reliably improved.

Next, FIG. 5 shows a second embodiment.

In the second embodiment, a recess 10 is provided on one side surface 3a of the capacitor element 3, and a projection 9 provided on the cathode lead terminal 2 is fitted and engaged in the recess 10. It is configured as follows.

With such a configuration, the positioning of the capacitor element 3 in the width direction and the longitudinal direction with respect to both the lead terminals 1 and 2 is performed by the cathode lead terminal to the recess 10 provided in the capacitor element 3. This can be done automatically and accurately by the fitting engagement of the projection 9 provided on the.

The fitting engagement of the projection 9 with the recess 10 can support a part of the stress acting on the connecting portion between the capacitor element 3 and the cathode lead terminal 2, and also the conductive paste 6 can be used. Since the adhesive area can be increased, the electrical connection strength of the conductive paste 6 can be reliably improved.

The projection provided on the cathode lead terminal 2 is not limited to the projection 9 provided by denting the lower surface as described above, and as shown in FIG. It goes without saying that the narrow portion provided may be formed as a projection 9'formed by bending upward.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a solid electrolytic capacitor according to a first embodiment of the present invention.

FIG. 2 is a sectional plan view taken along the line II-II of FIG.

FIG. 3 is an exploded view.

FIG. 4 is a perspective view of a capacitor element.

FIG. 5 is an exploded view showing a second embodiment of the present invention.

FIG. 6 is a perspective view showing a modified example of the cathode lead terminal in the present invention.

FIG. 7 is a vertical sectional front view of a conventional solid electrolytic capacitor.

8 is a plan sectional view taken along the line VIII-VIII of FIG.

[Explanation of symbols]

1 Anode lead terminal 2 Cathode lead terminal 3 Capacitor element 4 anode rod 5 Cathode film 6 Conductive paste 7 package 8 ditch 9,9 'protrusion 10 recess

Claims (2)

[Claims] 1. A capacitor element is fixed between an anode lead terminal and a cathode lead terminal, the anode rod protruding from one end surface of the capacitor element being fixed to the anode lead terminal, and the cathode film on the side surface thereof. Is disposed so as to be electrically connected to the cathode lead terminal with a conductive paste, and in a solid electrolytic capacitor formed by hermetically sealing the whole with a package body made of synthetic resin, on a side surface of the capacitor element, A structure of a package type electrolytic capacitor, characterized in that a recessed groove into which a projection provided on the cathode lead terminal is fitted and engaged is provided so as to extend in a longitudinal direction of the cathode lead terminal. 2. A capacitor element, between an anode lead terminal and a cathode lead terminal, which are disposed opposite to each other, an anode rod protruding from one end surface of the capacitor element is fixed to the anode lead terminal, and a cathode film on the side surface thereof. Is disposed so as to be electrically connected to the cathode lead terminal with a conductive paste, and in a solid electrolytic capacitor formed by hermetically sealing the whole with a package body made of synthetic resin, on a side surface of the capacitor element, A structure of a package type electrolytic capacitor, characterized in that a recess provided with which a projection provided on the cathode lead terminal is fitted and engaged is provided.