Cathode ray tube

Claim 1

A colour cathode ray tube comprising: an evacuated envelope having a faceplate comprised by a multiplicity of closely packed optical fibers extending from the inside to the outside thereof; a uniform layer of phosphor inside said faceplate and adapted to emit light in a selected band; a shadow mask positioned inside the envelope adjacent said faceplate and having apertures therein; electron beam generating means adapted to generate a plurality of electron beams originating from spaced apart positions such that different arrays of zones on said phosphor layer may be irradiated through said shadow mask with respective different ones of said beams, each said zone having an area defined by a shadow mask aperture and by a corresponding beam which covers the ends of a plurality of said optical fibres; scanning means for causing said beams to scan said phosphor layer in line scan and frame scan directions; and a plurality of arrays of colour elements outside said faceplate located at positions corresponding respectively to the positions of said different arrays of zones so that each said zone is connected to its corresponding said colour element by the optical fibres covered by said zone, each colour element being adapted to provide light upon the transmission of light thereto through said optical fibres from the corresponding zone of said phosphor layer, the colour elements of the same colour element array being adapted to provide light of the same colour, and the different colour element arrays being adapted to provide light of different colours.