Sprague Electric Company

Robert L Foisy

Richard D Baker

A pocket within the molded casing of a solid electrolyte capacitor is of greater volume than a fuze passing through the pocket, thereby ensuring that the fuze will not reestablish its conductive path after being blown. The pocket is established between layers of polyester tape that insulate the cathode of the capacitor from its leadframe and protect the fuze from the molding material.

Molded fuzed solid electrolyte capacitor

A standard tinned nickel-iron alloy lead frame has a plurality of pairs of extending tab portion positioned in a straight row. A long straight piece of an exothermically alloyable fuse wire, with a core of aluminum coaxially clad with palladium in approximately equal volumes, is held in contact with the plurality of pairs of lead frame tabs. Heat is applied to the fuse strand at two points; namely, on one and the other sides of each pair of tabs initiating progressive alloying in two directions from each heated point. When the progressive alloying and melting of the fuse strand reaches a tab, the tab is heated and heat sinks the fuse strand to stop the progressive alloying and melting. There is simultaneously formed a metallurgical bond between the ends of each remaining elemental fuse strand, respectively, and each of the pair of tabs that are bridged by that remaining elemental strand.

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Sanford, ME, United States of America

Robert L Foisy