Gte Sylvania Incorporated

North American Philips Consumer Electronics Corp.

Mahlon B Fisher

Anthony V Gallaro

G Norman Williams

Peter H Rollason

Robert L Donofrio

George N Williams

A cathode ray tube has discrete x-ray absorbing means integrally associated with the face region thereof to beneficially attenuate the x-radiation emanating peripherally and forwardly therefrom. Attached to the tube face is a closed frame-like resilient gasket impregnated with x-ray absorbing material. Superposed thereon is a cover plate of x-ray absorbing glass. This is adhered to the tube face by a layer of substantially transparent adhesive confined within the gasket.

CRT Incorporating x-ray absorbing means

A color cathode ray tube screen structure, having means for enhancing the absorption of ambient light and providing improvement in the contrast of the image display, is comprised of three superimposed substantially continuous window-defining layers of optical filter materials. The primary, secondary and tertiary filter layers have discretely disposed window areas formed therein to expose a pattern of filter areas representing the respective filter materials. The filter windows are of a shaping similar to that of the apertures in a spatially related pattern mask member. Each window exhibits a uniform periphery free of indentations, being so defined by a uniform opaque interstitial encompassment homogeneously made up of the three distinct layers of filter materials. Disposed over the filter windows is a patterned screen of cathodoluminescent phosphor elements, which upon electron excitation produces color-emissions that are colormetrically related to the respective filter windows therebeneath.

Color cathode ray tube screen structure providing improved contrast

In an optical scanning exposure system for manufacturing cathode ray tubes having a faceplate with an inner surface layer of photosensitive material and an adjacent apertured mask wherein the exposure system includes a light source providing a light beam, an angle of incidence deflector means for deflecting the light beam at an angle related to the angle of incidence of an electron beam, means for imaging the light beam, and a means for scanning the light beam in a predetermined fashion over the apertured mask to expose the photosensitive material, a control system having a means for storing information representative of the angle of incidence of a light beam and the rate of scanning of a light beam between a matrix of positional locations on the faceplate, a scan rate means for controlling the rate of horizontal and vertical light beam scanning, an encoder means providing light beam positional information to the storage means, and an angle of incidence control means for activating the angle of incidence deflector means in accordance with angular information of the storage means. Other aspects of the invention include controlling the integral with respect to time of the light beam intensity to effect uniform photosensitive material exposure, controlling movement of the effective light beam source to control the size and shape of the exposure area, and controlling the overlapping and overscanning of the light beam scanning to minimize stripes of unexposed photosensitive material and to provide uniform exposure at the edges of the faceplate.

Overlap and overscan exposure control system

A process for forming a color cathode ray tube screen structure, having means for enhancing the absorption of ambient light and providing improvement in the contrast of the image display involves the deposition of three superimposed substantially continuous window-defining layers of optical filter materials. The primary, secondary and tertiary filter layers have discretely disposed window areas formed therein to expose a pattern of filter areas representing the respective filter materials. The filter windows are of a shaping similar to that of the apertures in a spatially related pattern mask member. Each window exhibits a uniform periphery free of indentations, being so defined by a uniform opaque interstitial encompassment homogeneously made up of the three distinct layers of filter materials. Disposed over the filter windows is a patterned screen of cathodoluminescent phosphor elements, which upon electron excitation produces color emissions that are colormetrically related to the respective filter windows therebeneath.

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Skaneateles, NY, United States of America

Mahlon B Fisher