JPH0745480A - Chip solid electrolytic capacitor - Google Patents

Abstract

PURPOSE:To provide a chip solid electrolytic capacitor in which trouble can be prevented at the time of reverse mounting without sacrifice of the easy fabrication and the volumetric capacitance. CONSTITUTION:Capacitor elements 1 connected with cathode terminals 4a, 5a are arranged such that the planted anode leads 2 oppose each other and the anode lead 2 is welded to an anode terminal 3a having anode outer terminal parts 3b, 3c at the opposite ends. The cathode terminals 4a, 5a and the anode terminal 3a are led out in the opposite directions. The line connecting the cathode terminal parts 4b, 5b intersects the line connecting the anode outer terminal parts 3b, 3c perpendicularly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type solid electrolytic capacitor, and more particularly to a chip type solid electrolytic capacitor provided with a reverse mounting preventing means.

[0002]

2. Description of the Related Art Chip type solid electrolytic capacitors are usually
2A shows a perspective view seen from the upper surface, and FIG. 2B shows a cross-sectional view seen from the front, as shown in FIG. A cathode terminal 9 is electrically connected to the peripheral surface of an element (abbreviated as element) 1 by a conductive adhesive 6, and the anode lead 2 and the anode terminal 10 are electrically connected by welding or the like. Except for a predetermined part of the anode terminal 10 (portion that serves as a connection terminal to an external circuit), the transfer terminal is used to coat the cathode terminal 9 and the anode terminal 10 with the exterior resin 8. It is made by bending it in a U shape along the circumference of the.

Since the above-mentioned chip type solid electrolytic capacitor is polar and has a bilaterally symmetrical shape, there is a risk that reverse mounting may occur at the time of mounting on a printed wiring board or the like. Therefore, a three-terminal type or a four-terminal type solid electrolytic capacitor has been proposed so that the reverse mounting does not occur even when the left and right are reversed in the conventional mounting. For example, a capacitor having a perspective view seen from the top in FIG. 3A and a cross-sectional view seen from the front in FIG. 3B is a conventional 4-terminal capacitor which has been subjected to the reverse mounting prevention measures as described above. Type solid electrolytic capacitor. Referring to both figures, in this capacitor, the anode lead 2
At both ends, and both ends are external terminal portions 11a, 11b for cathodes at the cathode portion of the capacitor element 1 formed by forming an anodized film, a solid electrolyte layer and a cathode layer on the anode body by known means. One of the cathode terminals 11 is connected by a conductive adhesive 6. Also, after removing the respective anodic oxide coatings on both ends of the anode lead 2, the anode terminal 1
2a and 12b are connected by welding, and then the above-mentioned 2
The exterior is applied and the terminals are bent by the same method as for terminal type solid electrolytic capacitors.

In Japanese Utility Model Publication No. 3-95619, 3
A terminal type solid electrolytic capacitor is disclosed. In this capacitor, FIG. 4 (a) shows a perspective view seen from the back side, FIG. 4 (b) is a sectional view taken along the line AB, and FIG. 4 (c) is a sectional view taken along the line C-.
As shown in the cross-sectional view taken along the line D, the two capacitor elements 1 having the cathode layer are arranged so that the cathode terminals 1 face each other.
1 are arranged and connected on top. In addition, the two anode leads 2 protruding from the capacitor element 1 in opposite directions, respectively.
Is the anode terminal 1 which is drawn out symmetrically with respect to the cathode terminal 11.
2a and 12b, respectively. Capacitor element 1, cathode terminal 11, anode lead 2 and anode terminal 12
Capacitor components such as a and 12b are connected to the cathode terminal 11
Also, the anode terminals 12a and 12b are covered with the exterior resin 8 except for a predetermined portion (portion that serves as a connection terminal for an external circuit). Cathode terminal 11 and anode terminal 12a,
A portion of 12b that is not covered with the exterior resin 8 is bent along the outside of the exterior resin 8. In the terminal arrangement of this capacitor, the cathode external terminal and the anode external terminal are asymmetric, so that reverse mounting does not occur.

[0005]

Among the conventional chip-type solid electrolytic capacitors having the above-mentioned measures against the reverse mounting, the 4-terminal type solid electrolytic capacitor requires the use of the capacitor element 1 having the anode lead 2 penetrating therethrough. However, forming the anode body that penetrates the anode lead 2 itself complicates the manufacturing process. Moreover, since the step of forming the solid electrolyte layer or the cathode layer includes the dipping step, a layer other than the anodic oxide film is thickly formed on the surface of either one of the anode leads 2 and therefore, the removal of these layers. Additional steps are required, which further complicates the manufacturing process. As a result, the productivity is remarkably deteriorated and the cost is increased as compared with the two-terminal type in which the reverse mounting prevention measure is not applied.

Further, in the three-terminal type solid electrolytic capacitor disclosed in Japanese Utility Model Laid-Open No. 95619/1993, the anode terminal is provided for each of the two anode leads 2 protruding from the capacitor element 1 in opposite directions. Since a space for connecting with 12a and 12b and a space for preventing a short circuit with the cathode layer must be provided, there is a demerit that the capacitance value per unit volume of the capacitor becomes small.

Therefore, it is an object of the present invention to provide a chip type solid electrolytic capacitor which is provided with a measure for preventing reverse mounting which does not sacrifice the ease of manufacture and the capacitance value of the capacitor. .

[0008]

A chip-type solid electrolytic capacitor of the present invention comprises anode leads that are erected so as to protrude in one direction, and the protrusion directions of the anode leads that are respectively erected face each other. The two solid electrolytic capacitor elements arranged in such a manner that each of the cathode portions of the two solid electrolytic capacitor elements extends in a direction opposite to the protruding direction of the anode lead embedded in the solid electrolytic capacitor element. And a cathode terminal electrically fixedly connected to each other, and an anode terminal that is arranged so that its longitudinal direction is orthogonal to the protruding direction of the two anode leads and is electrically fixedly connected commonly to the two anode leads. , The solid electrolytic capacitor element, the anode lead, the cathode terminal, and the anode terminal should be connection terminals with circuits external to the cathode terminal and the anode terminal. Characterized in that it comprises an exterior resin covering leaving moiety.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. 1 (a), 1 (b) and 1 (c) are a top perspective view, a front sectional view and a side sectional view, respectively, of an embodiment of the present invention.

Referring to the above three figures, in this embodiment, two capacitor elements 1 in which the cathode terminals 4a and 5a are electrically connected by a conductive adhesive 6 are connected in one direction from each capacitor element 1. The tips of the anode leads 2 led out to are arranged so as to face each other. A metal anode terminal 3a is arranged on the anode lead 2 so as to be perpendicular to the lead-out direction, and each anode lead 2 and the anode terminal 3a are welded. The assembly thus formed is insulated and covered with the covering resin 8 so that the anode external terminal portions 3b and 3c and the cathode external terminal portions 4b and 5b are exposed. The transfer resin method can be used to form the exterior resin 8. The anode external terminal portions 3b and 3c and the cathode external terminal portions 4b and 5b are bent in a U-shape along the outer wall of the exterior resin 8.

In this embodiment, as shown in FIG.
Since two cathode external terminals and two anode external terminals are symmetrically arranged, the polarity does not reverse even when they are reversely mounted.

Further, by using the cathode external terminal portion 4b and the cathode external terminal portion 5b separately,
With one capacitor, it can be used as two capacitors functionally. On the other hand, the cathode external terminal portion 4b and the cathode external terminal portion 5b are electrically connected to each other on the circuit to be used, whereby two capacitors are electrically connected in parallel to each other and electrostatic capacitance is increased. Can be doubled.

Further, the capacitor element 1 used in this embodiment
Does not need to be particularly changed in its manufacturing process because it can have the same shape as the capacitor element of the conventional chip type solid electrolytic capacitor.

Further, the connection between the anode lead 2 and the anode terminal 3a does not need to keep the distance between the capacitor element 1 and the anode terminal 3a at two places as in the conventional case, so that the actual connection is 3-956.
The volumetric efficiency of electric capacity can be increased by 20% or more as compared with the three-terminal fixed electrolytic capacitor disclosed in Japanese Laid-Open Patent Publication No.

The anode leads may be arranged not only so that their tips face each other but also arranged side by side and welded to the anode terminals 3a, respectively.

[0016]

As described above, in the chip type solid electrolytic capacitor of the present invention, two capacitor elements are arranged so that their anode leads face each other, and one chip having external terminal portions for anode is provided at both ends. The anode lead is electrically connected to each anode lead to reduce the insulating space from the cathode layer.

As a result, according to the present invention, it is possible to provide a chip-type solid electrolytic capacitor provided with a reverse mounting prevention measure without sacrificing the ease of manufacture and the capacitance value per volume of the capacitor.

[Brief description of drawings]

FIG. 1A is a perspective view of a chip type solid electrolytic capacitor according to an embodiment of the present invention seen from above. Diagram (b) is a cross-sectional view of the capacitor shown in diagram (a) as seen from the front. Diagram (c) is a cross-sectional view of the capacitor shown in diagram (a) as viewed from the side.

FIG. 2A is a perspective view seen from the upper surface of a conventional chip-type solid electrolytic capacitor in which a reverse mounting prevention measure is not applied. Diagram (b) is a cross-sectional view of the capacitor shown in diagram (a) as seen from the front.

FIG. 3A is a perspective view seen from the top surface of an example of a conventional chip-type solid electrolytic capacitor having a countermeasure for preventing reverse mounting. Diagram (b) is a cross-sectional view of the capacitor shown in diagram (a) as seen from the front.

FIG. 4A is a perspective view of another example of a conventional chip-type solid electrolytic capacitor having a reverse mounting prevention measure, viewed from the top. Diagram (b) is a cross-sectional view of the capacitor shown in diagram (a) as seen from the front. Diagram (c) is a cross-sectional view of the capacitor shown in diagram (a) as viewed from the side.

[Explanation of symbols]

 1 Capacitor element 2 Anode lead 3a, 10, 12a, 12b Anode terminal 3b, 3c Anode external terminal part 4a, 5a, 9, 11 Cathode terminal 4b, 5b, 11a, 11b Cathode external terminal part 6 Conductive adhesive 8 Exterior resin

Claims (3)

[Claims] 1. A solid electrolytic capacitor element comprising anode leads that are erected so as to protrude in one direction, and two solid electrolytic capacitor elements that are arranged so that the protrusion directions of the anode leads that are respectively erected face each other. A cathode terminal electrically fixedly connected to each of the cathode portions of the two solid electrolytic capacitor elements so as to extend in a direction opposite to the protruding direction of the anode lead embedded in the solid electrolytic capacitor elements, An anode terminal that is arranged so that the direction is orthogonal to the protruding direction of the two anode leads and is electrically fixedly connected in common to the two anode leads; the solid electrolytic capacitor element, the anode lead, and the cathode terminal And an exterior resin that covers the anode terminal, leaving a portion to be a connection terminal to the external circuit of the cathode terminal and the anode terminal. Chip type solid electrolytic capacitor. 2. The chip-type solid electrolytic capacitor element according to claim 1, wherein the two solid electrolytic capacitor elements are arranged such that tips of two anode leads face each other. Electrolytic capacitor. 3. The chip type solid electrolytic capacitor according to claim 1, wherein the two solid electrolytic capacitor elements are arranged such that two anode leads are arranged in parallel.