Browse Prior Art Database

Current-Limited Chip Capacitor

IP.com Disclosure Number: IPCOM000043537D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Horstmann, RE: AUTHOR [+2]

Abstract

The incorporation of an appropriate thin-film PYROFUZE* element integral with a chip capacitor eliminates fire hazard due to possible internal shorting of the capacitor component. The improvement here disclosed consists of replacing the existing continuous plate termination with a modified termination to allow for incorporation of the fuse element previously noted. Fig. 1 shows the old solderable land area for the ribbon leads. The improved method separates and electrically isolates the plate termination and the solder land, as shown in Fig. 2. Separation is accomplished by (1) reshaping one or both sets of capacitor plates by changing the printing pattern and (2) changing the termination pattern by using a print mask with a laser or some photolith and etching process.

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Current-Limited Chip Capacitor

The incorporation of an appropriate thin-film PYROFUZE* element integral with a chip capacitor eliminates fire hazard due to possible internal shorting of the capacitor component. The improvement here disclosed consists of replacing the existing continuous plate termination with a modified termination to allow for incorporation of the fuse element previously noted. Fig. 1 shows the old solderable land area for the ribbon leads. The improved method separates and electrically isolates the plate termination and the solder land, as shown in Fig. 2. Separation is accomplished by (1) reshaping one or both sets of capacitor plates by changing the printing pattern and (2) changing the termination pattern by using a print mask with a laser or some photolith and etching process. The device is completed by either (1) soldering or joining across the gap a pyro-fuse device (Fig. 3A) or (2) printing a current-limiting link in the same step as the termination pattern, as shown in Fig. 3B. * Trademark of Sigmund Cohn Corp.

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