CRT Incorporating x-ray absorbing means

Claim 1

A cathode ray tube having x-ray absorbing means integrally associated with the face region thereof, said means being a combination comprising: an open frame-like gasket of uniform predetermined thickness such being shaped as a one-piece continuous-wall member having an outer surface substantially conforming to the perimetrical shape of said face region and an inner surface circumscribing the utilized facial area of said tube, said gasket having a wall width defined by the material intermediate said outer and inner surfaces, the material thickness of said gasket being defined by front and rear surfaces with the rear surface thereof being adhered to the exterior peripheral region of said tube face area; a substantially transparent cover plate of x-ray absorbing glass having front and rear surfaces and being of a size greater than said utilized facial area of said tube, said cover plate being superposed upon and peripherally adhered to the front surface of said gasket; and a confined layer of substantially transparent adhesive material completely filling the facial region encompassed by said gasket thereby effecting bonding of said cover plate to the face area of said tube, characterized in that the gasket is formed of a substantially resilient closed cell polymer composition impregnated with x-ray absorbing material, and in that said gasket has a plurality of discrete piercings extending through said outer and inner surfaces to provide self-closing port means therein.