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US 4,375,578 AGranted
Semiconductor device and method of making the same
AssigneeGeneral Dynamics, Pomona Division
InventorsGordon C. Mitchell, Barney Horwitz
Life of this patent
Estimating the term…
Abstract
A sealing liner of flexible material such as Teflon has a downwardly tapering side wall which is positioned over a header. A case is positioned over the liner, and the top of the case is moved into engagement with the top of the liner to capture the tapered side wall of the liner between the side walls of the header and the case to provide a tight cold flow seal so that small particles working loose from the case cannot reach the header.
Claims7
A semiconductor device comprising:
- a substantially cup-shaped header means of electrical insulating material having semiconductor means atop thereof and having flange means at the bottom thereof;
- a substantially cup-shaped case means for positioning over said header means with a space between the side wall of said case means and said header means and having flange means at the bottom thereof for connection to the flange means on said header means;
- and
- a substantially thimble-shaped liner means of flexible, electrical insulating material for positioning between said header means and said case means, said liner means including a side wall that tapers toward the bottom and forming lip means for positioning between the side wall of said liner means and the side wall of said case means in pressure engagement with said side walls, said liner means comprising means for providing a tight seal and preventing small particles which work loose from said case means from engaging the semiconductor means atop said header means.
1 more element
The method of sealing a semiconductor means in a semiconductor assembly comprising the steps of:
- positioning a substantially thimble-shaped flexible liner means of cold-flowable material having a tapered side wall over a substantially cup-shaped header means having a semiconductor means atop thereof and flange means at the bottom thereof;
- positioning a substantially cup-shaped case means having flange means at the bottom thereof over said liner means and moving the top of said case means against the top of said liner means until the flange means on said case means engages the flange means on said header means for capturing the tapered side wall of said liner means between said header means and said case means in tight sealing engagement and forming a chamber over said header means;
- and
- joining said case flange means to said header flange means.
1 more element
Dependencies are inferred from the claim text.