JP3374459B2 - Aluminum electrolytic capacitor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum electrolytic capacitor having a lead wire.

[0002]

2. Description of the Related Art In recent years, the phenomenon of releasing chlorine into the atmosphere has been regulated to protect the ozone layer from destruction, and the use of heat-shrinkable tubes made of vinyl chloride may be abolished in the future. .

A conventional aluminum electrolytic capacitor will be described below with reference to the drawings. FIG. 6 is a sectional view showing the structure of a conventional aluminum electrolytic capacitor. In FIG. 6, 1 is an anode lead wire, 2 is an anode aluminum foil, 3 is a cathode lead wire, and 4 is a cathode lead wire.
Is a cathode aluminum foil, 5 is a separator, 6 is a sealing rubber, 7 is a driving electrolytic solution, 8 is an outer case, 9 is a heat-shrinkable tube,
Reference numeral 10 is an adhesive tape, and 11 is a capacitor element. The structure will be described in detail below.

First, in the capacitor element 11, the anode aluminum foil 2 to which the anode lead wire 1 is joined and the cathode aluminum foil 4 to which the cathode lead wire 3 are joined are wound up integrally via the separator 5, and the outer periphery thereof is the adhesive tape 10. It is fixed at. The sealing rubber 6 is inserted into the two lead wires 1 and 3 of the capacitor element 11, impregnated with the driving electrolyte solution 7 and housed in the outer case 8, and then the opening of the outer case 8 is deformed to seal it. It is in close contact with the rubber 6.

After inserting the heat-shrinkable tube 9 indicating the model number and polarity into the outer case 8 thus sealed,
The heat-shrinkable tube 9 is fixed by heat-shrinking, and the heat-shrinkable tube 9 is often made of vinyl chloride.

[0006]

However, in the above-mentioned conventional structure, the heat-shrinkable tube 9 made of vinyl chloride is used, and when this vinyl chloride is discarded and burned, chlorine is generated to destroy the ozone layer. Had.

Furthermore, the heat-shrinkable tube 9 has a defect that the shape after shrinkage is unstable, and thus the heat-shrinkable tube 9 deviates from the outer dimensions, and the heat-shrinkable tube 9 does not shrink when a voltage is applied at a high temperature for the purpose of repairing cracks in the oxide film of the anode. Proceeding to the end surface of the outer case 8, a defect such as a defect of the end face of the heat shrinkable tube 9, a defect of cracking or chipping of the end face of the heat shrinkable tube 9, and a defect due to a deviation between the polarity display printed on the heat shrinkable tube 9 and each lead wire 1 or 3 during mounting There was a problem of doing.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an aluminum electrolytic capacitor which does not use a heat-shrinkable tube.

[0009]

In order to solve this problem, the aluminum electrolytic capacitor of the present invention has a cathode foil formed in the same manner as a strip-shaped anode foil made of aluminum foil to which lead wires are connected via a separator. And the wound capacitor case, a bottomed outer case that contains this capacitor element and electrolyte, a sealing rubber that fits into the opening of this outer case and seals the outer case, and a part that insulates from the mounting surface.
By applying a resin having insulating properties to the outer case upper surface serving as a
It is configured by an insulator provided by curing and forming .

In addition to this structure, the model number, polarity, etc. are displayed on either or both of the bottom surface and the side surface of the outer case.

[0011]

With this configuration, it is possible to eliminate the heat-shrinkable tube that causes the ozone layer to be destroyed, and therefore it is possible to eliminate defects associated with the heat-shrinkable tube and omit the inspection process.

Further, since the display is displayed on the outer case, it is possible to cope with the change of the product type only by changing the print pattern. Therefore, it is possible to perform the operation in an extremely short time as compared with the conventional conversion of the heat shrinkable tube.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An aluminum electrolytic capacitor according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view showing the structure of the aluminum electrolytic capacitor according to the embodiment. In FIG. 1, reference numeral 11 denotes a capacitor element, and the structure of the capacitor element 11 of the conventional aluminum electrolytic capacitor described with reference to FIG. The anode aluminum foil (not shown) to which the anode lead wire 1 is joined and the cathode aluminum foil (not shown) to which the cathode lead wire 3 are joined are separated by a separator (not shown). It is wound up as a unit and fixed on its outer periphery with an adhesive tape 10.

Reference numeral 8 denotes a bottomed outer case, in which the capacitor element 11 is impregnated with the driving electrolytic solution 7, and the sealing rubber 6 is fitted and stored therein, and the opening is deformed to form the sealing rubber 6. An insulating sheet 12 made of nylon or the like is adhered to the upper part and is attached to the upper part to insulate the mounting surface.

FIG. 2 shows an example in which a resin 13 having an insulating property is applied and cured in place of the insulating sheet 12 of the aluminum electrolytic capacitor of the present invention shown in FIG. Since it is the same as the above, the description thereof will be omitted.

FIG. 3 (a) is a front view of the aluminum electrolytic capacitor according to the present invention shown in FIG. 1, and FIG. 3 (b) is an example in which the model number and polarity are displayed on the bottom surface of the outer case 8. It is the bottom view shown, and shows the method replaced with the display which was performed to the conventional heat-shrinkable tube 9, and can be performed by laser or ink.

FIG. 4 shows an example in which the model number, polarity, etc. are displayed on the outer case 8 as in FIGS. 3 (a) and 3 (b). In FIG. 4, the outer peripheral surface of the outer case 8 ( (Cylindrical surface)
Is displayed.

FIG. 5 shows an example in which the sticker 14 on which display items such as model number and polarity are printed is attached to the outer peripheral surface (cylindrical surface) of the outer case 8.

As described above, in the aluminum electrolytic capacitor according to the present invention, the mounting surface of the outer case 8 is insulated by using the insulating sheet 12 and the insulating resin 13, and the outer case 8 is also insulated.
By indicating the model number and polarity on the, it is possible to eliminate the heat-shrinkable tube that causes ozone layer destruction.
In addition, it is possible to reduce defects and inspection processes related to the heat shrinkable tube and improve productivity.

[0021]

As described above, the aluminum electrolytic capacitor according to the present invention can eliminate the heat-shrinkable tube, is effective as a countermeasure against ozone layer depletion, and reduces defects, eliminates inspection steps, and simplifies work. It has excellent effects that are effective in improving the efficiency of production by reducing the cost of materials, reducing material costs, and shortening the time required for switching types.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of an aluminum electrolytic capacitor according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the other embodiment.

FIG. 3A is a front view of the aluminum electrolytic capacitor according to the embodiment, and FIG. 3B is a bottom view of the same.

FIG. 4 is a front view showing an example in which the model number, polarity, etc. are displayed on the aluminum electrolytic capacitor according to the embodiment.

FIG. 5 is a front view showing an example in which a seal indicating the model number, polarity, etc. is attached to the aluminum electrolytic capacitor according to the same embodiment.

FIG. 6 is a sectional view showing the structure of a conventional aluminum electrolytic capacitor.

[Explanation of symbols]

1 Anode lead wire 3 cathode lead wire 6 sealing rubber 7 Drive electrolyte 8 exterior case 10 Adhesive tape 11 Capacitor element 12 Insulation sheet 13 resin 14 seal

Continuation of the front page (56) Reference JP-A-60-245119 (JP, A) Actual development 55-141934 (JP, U) Actual development Flat 3-92021 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) H01G 9/00 321 H01G 9/00 311 H01G 9/08

Claims (2)

(57) [Claims] 1. A capacitor element in which a cathode foil formed in the same manner as a strip-shaped anode foil made of an aluminum foil to which a lead wire is connected is wound with a separator interposed therebetween, and a bottomed bottom containing the capacitor element and an electrolytic solution. -Like outer case, a sealing rubber that fits into the opening of this outer case and seals the outer case, and an upper surface of the outer case that is a part that insulates from the mounting surface.
An aluminum electrolytic capacitor made of an insulating material provided by applying an insulating resin and curing the resin . 2. The aluminum electrolytic capacitor according to claim 1, wherein a model number, a polarity and the like are displayed on one or both of a bottom surface and a side surface of the outer case.