Patent ID: 6171420
Filing Date: 2001-01-09
Classification: H01L

Abstract:
A process of manufacturing a functional film element, which comprises the steps of:placing a covering plate on one side of a window spacer plate, which is provided with at least one window, to cover and close said window;placing a through hole plate with through holes on the other side of said window spacer plate so that at least parts of said through holes communicate with said window, and said through holes are elongated outward from said window;laminating and integrally firing the green sheets of said plates in such a manner that a ratio t/w of thickness t of the green sheet for said window spacer plate to width w of said through hole formed in the green sheet for said through hole plate in its minor axis direction is one or more, to produce a ceramics substrate formed with a cavity in which said through holes communicate with said window; andforming a functional film on the outer surface of said covering plate.