Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1985-03-04
1987-05-12
Griffin, Donald A.
Metal working
Method of mechanical manufacture
Assembling or joining
361433, 26427218, H01G 900, B29F 110
Patent
active
046638245
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an aluminum electrolytic capacitor and a manufacturing method therefor and aims at the provision of an aluminum electrolytic capacitor which is superior in heat resistance during the soldering thereof and is capable of being miniaturized.
BACKGROUND OF THE INVENTION
Referring to FIG. 1, dry aluminum electrolytic capacitor most widely used among the aluminum electrolytic capacitors is so constructed that an element comprising anode aluminum foil 4 and cathode aluminum foil 5, which are wound and partitioned by separators 6, is provided in a space enclosed with an aluminum casing 1, a rubber packing 2 and a plastic plate 3. and An anode lead 7 and a cathode lead 8 are fixed to the rubber packing 2 or plastic plate 3 in holes previously bored, the separators 6 being impregnated with an electrolyte, such as a solution or organic or inorganic salt or a liquid of large ionization constant, for facilitating electrical connection of anode aluminum foil 4 with cathode aluminum foil 5. Also, the aluminum casing 1 is contracted in part to keep mechanical connection of the aluminum casing 1 and rubber packing 2.
The aluminum electrolytic capacitor constructed as described in the foregoing is often used as an electric circuit element because it is large in electrostatic capacity and low in cost. On the other hand, the circuit element has a tendency to be used in a chip because it is demanded that the productivity and the circuit element density of a substrate are expected to be improved by use of the face-bonding.
Such as aluminum electrolytic capacitor, however, contains therein a liquid, thereby creating the following problems:
1. The electrolyte is apt to vaporize due to the heat developed during the soldering process (250.degree. through 260.degree. C. at a temperature of soldering), which is remarkable especially in the dipping process of chipping the circuit element and soldering it while being dipped in molten solder, so that pressure in the aluminum casing 1 rises to break and scatter the rubber packing 2 or plastic plate 3, or the inner liquid may leak outwardly between the lead 7 or 8 and the rubber packing 2, thereby causing the characteristic of circuit element to deteriorate. Hence, it is required in designing the circuit element that the lead only comes into contact with solder, which has put a large restriction on the design.
2. The combination of several parts requires extra space in the casing, which hinders mintaturization of the element.
SUMMARY OF THE INVENTION
A manufacturing method for an aluminum electrolytic capacitor of the invention comprises the steps of forming a resin casing molded to be integral with a pair of terminals perforating the walls of the casing, inserting an aluminum electrolytic capacitor element into the resin casing, electrically connecting anode and cathode aluminum foils with the pair of terminals, guiding an electrolyte into the resin casing, and coupling the resin casing with a resin lid, so that the aluminum electrolytic capacitor element obtained is provided within a space enclosed with the resin lid and the resin casing molded integrally with the aforesaid pair of terminals, and the anode and cathode aluminum foils are electrically connected with each other, thereby enabling the aluminum electrolytic capacitor to be superior in sealing the electrolyte and also in strength.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view of the conventional aluminum electrolytic capacitor.
FIG. 2 is a sectional view of an embodiment of the invention which is an aluminum electrolytic capacitor of face-bonding type,
FIG. 3 is a sectional view of a metal mold for manufacturing the resin casing illustrated in FIG. 2,
FIG. 4 is an exterior view of a terminal in a modified embodiment of the invention,
FIG. 5 is an exterior view of an aluminum electrolytic capacitor of face-bonding type using the terminals illustrated in FIG. 4,
FIG. 6 is an exterior view of aluminum foil used in the manufacturing process of the embodiment
REFERENCES:
patent: 4205365 (1980-05-01), Kalina
patent: 4558399 (1985-12-01), Toyama et al.
Griffin Donald A.
Matsushita Electric - Industrial Co., Ltd.
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