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US 4,059,887 AGranted
Tantalum chip capacitor and method of manufacture
AssigneeAVX Corporation
InventorJohn L. Galvagni
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AssigneeAVX Corporation
InventorJohn L. Galvagni
Estimating the term…
The present invention is directed to a method of making a tantalum chip capacitor and the resultant capacitor device. The invention is characterized by encapsulating an essentially conventional tantalum capacitor subassembly including a body portion, the outer surface of which comprises a cathode, an anode, and an anode lead extending therefrom, within a metallic tubular case, preferably rectangular in transverse section. The subassembly is inserted within the casing and electrical connection is effected between the cathode and the case adjacent one end. An electrical connection is effected between the anode and the other end of the case. The case is thereafter filled with a polymeric insulating material in liquid form, which is thereafter caused to harden. After the polymeric material has hardened, a band, section or groove of the case is cut away to interrupt a direct current path between the ends of the case, which function as the terminals of the capacitor, the ends being maintained in structural integrity by the hardened polymeric material.
The method of manufacturing a capacitor from a capacitor subassembly which includes a cathode body and an anode lead, comprising the steps of providing a metal case member open at least at one end and having a hollow interior, inserting said subassembly into said case member, forming a first electrical connection between said cathode body and a first portion of said case member, forming a second electrical connection between said anode lead and a second portion of said case member longitudinally spaced from said first portion, introducing into the interior of said case member a quantity of a hardenable liquid polymeric material in quantity sufficient substantially to fill the void within said case surrounding said capacitor subassembly and lead, causing said material to harden, and thereafter removing a section of said case between said first and second portions at an area in registry with said polymeric material completely to divide said case into first and second sections mechanically connected but electrically isolated by said polymeric material.
Dependencies are inferred from the claim text.