JP2867554B2 - Flat aluminum electrolytic capacitor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat aluminum electrolytic capacitor in which a capacitor element is housed in a flat bottomed cylindrical metal case.

2. Description of the Related Art A conventional flat aluminum electrolytic capacitor of this type has a structure as shown in FIG. That is, 1 is a flat-bottomed cylindrical metal case made of aluminum having a bottom. The metal case 1 has a capacitor element 2 formed by winding an anode foil and a cathode foil together with a separator and impregnating with an electrolyte. The flat-type aluminum electrolytic capacitor is housed, and the open end of the metal case 1 is sealed with a flat sealing body 3. The anode foil and the cathode foil have anode lead terminals 4a and cathode lead terminals, respectively.
4b, and the anode lead terminal 4a and the cathode lead terminal 4b pass through the lead holes 4a 'and 4b' provided in the sealing body 3 and are taken out to the outside. FIG. 3 shows the second
FIG. 4 is a cross sectional view of the flat aluminum electrolytic capacitor shown in FIG. 4, and FIG. 4 is a side sectional view of the flat aluminum electrolytic capacitor shown in FIG.

In order to reduce the ESR (equivalent series resistance) of an aluminum electrolytic capacitor, as shown in FIG. 3, conventionally, when the anode lead terminal 4a and the cathode lead 4b and the anode foil and the cathode foil are maintained, the lead terminal 4b is The anode foil and the cathode foil were connected near the center so as to divide the length direction in which the foil was wound up into two equal parts. Thereby, the lead terminal 4 of the capacitor element 2
The take-out positions of a and 4b were offset downward as viewed in the height direction, as shown in FIGS. That is,
In the height direction, the minor diameter width D of the metal case 1 is equal to the insulation distance D ₁ and D
₂ (D ₁ > D ₂ ), and the lead terminals 4a, 4b are located below the center, which is the division point, from which the lead terminals 4a, 4b are taken out through the sealing body 3. Was.

Problems to be Solved by the Invention In recent years, as OA devices have become thinner, power supplies mounted on the devices have also become thinner. The flat aluminum electrolytic capacitor used in the power supply smoothing circuit is also
There is a growing need for a lower height to reduce the height every year. However, in the above-described conventional flat aluminum electrolytic capacitor, the short diameter width D in the height direction of the metal case 1 is set.
As the insulation distances D ₁ and D ₂ decrease as D ₁ > D ₂ , if the minor diameter width D decreases to some extent,
Lead terminals 4a, in which 4b and insulation distance D ₂ shorter in relation to the metal case 1 can no longer be guaranteed insulation distance stipulated, therefore, a limit to the reduction in height of the flat type aluminum electrolytic capacitor There was something.

In the above conventional flat aluminum electrolytic capacitor, the positions of the lead terminals 4a and 4b in the height direction are D ₁ > D ₂
Therefore, the positions of the anode lead terminal 4a and the cathode lead terminal 4b cannot be interchanged. Therefore, even if the circuit designer wants to wire the positive and negative positions of the lead terminals of the aluminum electrolytic capacitor on the printed circuit board in the opposite direction, the above-mentioned conventional flat aluminum electrolytic capacitor cannot cope with it. Had to buy something else, which wasted time and money.

Also, those who manufacture flat aluminum electrolytic capacitors must make two types of capacitors with the same dimensions, the same rating, plus and minus lead terminals, which are opposite to each other. And the cost of equipment is increased, and the cost is increased.

SUMMARY OF THE INVENTION The present invention solves such a problem, and a flat aluminum electrolytic capacitor that can be designed to have a low profile and that can easily set the plus and minus lead terminals on either the left or the right with one type of capacitor. The purpose is to provide.

Means for Solving the Problems In order to achieve the above object, a flat aluminum electrolytic capacitor of the present invention comprises a capacitor element obtained by winding an anode foil and a cathode foil together with a separator and impregnating with an electrolytic solution; And a cathode lead terminal having a flat bottomed cylindrical metal case for accommodating therein, and a sealing body for sealing an open end of the metal case, and connected to the anode foil and the cathode foil, respectively. Are taken out from the same direction, the leading end of the lead terminal is bent halfway, and then taken out from the center in the short diameter direction of the sealing body.

Operation According to the above configuration, the anode and the cathode connected to the anode foil and the cathode foil, respectively, are taken out from the same direction, and the leading end of the lead terminal is bent halfway.
The insulation distance D ₁ = D ₂ is obtained even if the short width D of the metal case, which is the height of the flat aluminum electrolytic capacitor, is reduced because the sealing body is taken out from the center in the short diameter direction of the sealing body. As a result, as a result, the insulation distance between the anode and cathode lead terminals and the upper end or lower end of the metal case can be made longer than the shorter insulation distance D ₂ shown in the conventional example, that is, when the same insulation distance is secured. Can reduce the width D of the short diameter of the metal case, so that a flat aluminum electrolytic capacitor having a shorter height than that of the conventional example can be manufactured.

Also, since this flat type aluminum electrolytic capacitor is symmetrical with respect to the top and bottom, it is easy to set the plus and minus lead terminals on either side by using one type of capacitor by turning this capacitor upside down. Therefore, the management cost and the equipment cost can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, FIG. 2 to FIG.
The same parts as those in the drawings are denoted by the same reference numerals, and only different points from the conventional example will be described.

That is, in one embodiment of the present invention, as shown in FIG. 1, the anode lead terminal 5a and the cathode lead terminal 5b respectively connected to the anode foil and the cathode foil constituting the capacitor element 2 are taken out from the same direction. After bending the tip portions of the lead terminals 5a and 5b on the way to form the bent portions 6a and 6b, the lead terminals 5a and 5b are taken out from the central portion of the flat sealing body 3 in the minor diameter direction. . With such a configuration, the anode and cathode lead terminals 5a and 5b and the upper end or lower end of the metal case 1 are arranged with respect to the short diameter D of the metal case 1 which is the height of the flat aluminum electrolytic capacitor. The insulation distances D ₁ and D ₂ satisfy the condition of D ₁ = D ₂ .

Therefore, even if the minor diameter width D of the metal case 1 which is the height of the flat type aluminum electrolytic capacitor is reduced, the insulation distance D ₁ = D ₂ does not change, so that the anode and cathode lead terminals 5a, 5
Insulation distance between b and upper or lower end of metal case 1
D ₁ and D ₂ can be larger than the shorter insulation distance D ₂ shown in the conventional example of FIGS. 3 and 4. That is, when securing the same insulation distance, the short diameter width D of the metal case 1 is used.
Therefore, a flat aluminum electrolytic capacitor having a lower profile than that of the conventional example can be manufactured.
Also, since this flat type aluminum electrolytic capacitor is symmetrical with respect to the top and bottom, by turning this capacitor upside down, the anode lead terminal 5a,
The cathode lead terminal 5b can be easily set on either side.

As is apparent from the above description of the embodiment, the flat aluminum electrolytic capacitor of the present invention takes out the anode and cathode lead terminals respectively connected to the anode foil and the cathode foil from the same direction, and has the tip of the lead terminal. Since the part is bent in the middle, it is taken out from the central part in the minor axis direction of the sealing body, so even if the minor axis width D of the metal case which is the height of the flat aluminum electrolytic capacitor is reduced. , Insulation distance D ₁
= D ₂ is not changed, as a result, the anode, made larger than the shorter insulation distance D ₂ showing the insulation distance between the upper end or the lower end of the cathode lead terminal and the metal case in the prior art, i.e. the same insulating When the distance is secured, the width D of the short diameter of the metal case can be reduced, so that a flat aluminum electrolytic capacitor having a shorter height than that of the conventional example can be manufactured.

Also, since this flat type aluminum electrolytic capacitor is symmetrical with respect to the top and bottom, it is easy to set the plus and minus lead terminals on either side by using one type of capacitor by turning this capacitor upside down. Therefore, the management cost and the equipment cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a flat type aluminum electrolytic capacitor showing one embodiment of the present invention, FIG. 2 is an exploded perspective view of a flat type aluminum electrolytic capacitor showing a conventional example, and FIG. FIG. 4 is a side sectional view of the capacitor. 1 ... metal case, 2 ... capacitor element, 3 ... sealing body, 5a ... anode lead terminal, 5b ... cathode lead terminal, 6
a, 6b …… Bent part.

Continuing on the front page (72) Inventor Minoru Hatake 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) inventor south Makotoharu Osaka Prefecture Kadoma Oaza Kadoma 1006 address Matsushita unit intra-industry Co., Ltd. (56) references JitsuHiraku Akira 62-10436 (JP, U) (58 ) investigated the field (Int.Cl. ⁶ H01G 9/008 H01G 9/08

Claims (1)

(57) [Claims] 1. A capacitor element in which an anode foil and a cathode foil are wound together with a separator and impregnated with an electrolytic solution, a flat bottomed cylindrical metal case for accommodating the capacitor element, and the metal case And an anode and a cathode lead terminal respectively connected to the anode foil and the cathode foil are taken out from the same direction, and the leading end of the lead terminal is bent in the middle. Then, the flat aluminum electrolytic capacitor is taken out from the central portion in the minor diameter direction of the sealing body.