US 5,391,958 A · Electron beam window devices and methods of making same

Abstract

An electron tube having a hole or "window" covered by a thin, electron permeable membrane is provided with means for minimizing stress concentration in the membrane adjacent the periphery of the hole, thereby relieving stress concentrations which would otherwise occur when the membrane is forced inwardly into the hole by atmospheric or other pressure on the exterior of the tube. In a manufacturing method, a polymeric ring may be provided between the membrane and the exterior wall of the tube. The polymeric ring, desirably a polyimide has a glass transition temperature less than the elevated temperature used to expel volatile materials from the interior of the tube. The polymeric ring substantially relieves stresses induced by differential thermal expansion or contraction at temperatures between the glass transition temperature and the elevated temperature, as during cooling following the volatile removal step.

Claims33

Dependent claims

A method of making an electron beam tube comprising the steps of:

(a) placing a closure unit including an electron-permeable portion and a polymeric material on a surface of a front wall of a hollow housing so that the electron-permeable portion overlies the hole and so that the polymeric material is in contact with the wall;
(b) bonding the closure unit and housing to one another to thereby form an assembly so that the closure unit is connected to the housing through the polymeric material;
(c) baking the assembly at an elevated bakeout temperature while evacuating the interior of the housing;
and
(d) cooling the baked assembly.

2 more elements

Dependencies are inferred from the claim text.

Electron beam window devices and methods of making same

Life of this patent

Electron beam window devices and methods of making same

Life of this patent

Abstract

Claims33