Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Patent
1974-04-22
1976-01-20
Clay, Darrell L.
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
29625, 29627, 317101C, 317101R, 317120, H05K 500
Patent
active
039340740
ABSTRACT:
Disclosed is an electrical circuit board structure incorporating a ceramic substrate wafer and metallic mounting means bonded to the substrate wafer for securing the structure to a housing. The metallic portion of the structure protects the ceramic wafer from mechanical stresses transmitted through the housing by providing structural integrity and dynamic isolation. Selection of such a metallic material having its coefficient of thermal expansion similar to that of the substrate material prevents the creation of thermal stresses between the ceramic and the metal portion of the structure.
The disclosed method comprises rigidly securing the ceramic substrate circuit board to the metallic member in such a way that the latter may be attached to the housing without stressing the ceramic material.
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Evelove Leon G.
Leone John S.
White Don E.
Anderson Daniel T.
Clay Darrell L.
Koundakjian Stephen J.
Oser Edwin A.
TRW Inc.
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