Hermetically sealed aluminum electrolytic capacitor

Details Hermetically sealed aluminum electrolytic capacitor Hermetically sealed aluminum electrolytic capacitor

1990-03-26

1991-01-22

Griffin, Donald A.

Electricity: electrical systems and devices

Electrolytic systems or devices

Liquid electrolytic capacitor

29 2503, H01G 910, H01G 700

Patent

active

049875191

ABSTRACT:
An aluminum electrolytic capacitor is housed in an aluminum can having one open end. A standard glass-to-metal seal having an outer tantalum ring is seated snugly within the mouth of the can. With the edge of the tantalum ring positioned flush with, or slightly below, the lip of the aluminum can, the beam of a pulsing infra red laser is directed at the interface between the tantalum ring of the seal and the aluminum lip of the can causing the lip of the can to melt, to flow over and to form a continuous annular Al-Ta weld with the tantalum ring and to hermetically seal the ring to the can continuously and completely at a peripheral edge of the tantalum ring.

REFERENCES:
patent: 3321675 (1967-05-01), Diggens
patent: 3522489 (1970-08-01), Sparrow et al.
patent: 3568009 (1971-03-01), Rappaport
patent: 3600017 (1971-08-01), Scherer
patent: 3628104 (1971-12-01), Markarian et al.
patent: 4296458 (1981-10-01), Smith et al.
patent: 4683516 (1987-07-01), Miller
patent: 4707424 (1987-11-01), Bowsky et al.

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