Cathode ray tube with composite multiple glass fibre face

Claim 1

AN ELECTRONIC TUBE ASSEMBLY COMPRISING A FIRST PHOTO-SENSITIVE CATHODE LAYER DEPOSITED UPON A FIRST WALL OF A FIRST EVACUATED ENVELOPE, A FIRST PHOSPHOR LAYER DEPOSITED UPON A SECOND WALL OF THE FIRST EVACUATED ENVELOPE, THE MAJOR AREA OF SAID SECOND WALL BEING IN THE FORM OF A BUNDLE OF VERY FINE LIGHT GUIDING FIBRES HAVING SMOOTH SIDE SURFACES AND OF A PREDETERMINED INDEX OF REFRACTION BONDED TOGETHER INTO A GAS-TIGHT SLAB BY A MATERIAL HAVING A LOWER INDEX OF REFRACTION AND WITH THE FIBERS ORIENTED IN A REGULAR ARRAY WITH THEIR LONGITUDINAL AXES EXTENDING FROM ONE MAJOR SURFACE OF THE SLAB TO THE OTHER, MEANS FOR ACCELERATING THE ELECTRONS EMITTED BY THE FIRST CATHODE LAYER SO THAT THEY BOMBARD THE FIRST PHOSPHOR LAYER, MEANS FOR FOCUSSING THE SAID ELECTRONS INTO AN IMAGEFORMING BEAM, A SECOND PHOTO-SENSITIVE CATHODE LAYER DEPOSITED UPON A THIRD WALL OF A SECOND EVACUATED ENVELOPE, THE THIRD WALL BEING IN THE FORM OF A BUNDLE OF LIGHT GUIDING FIBRES OF THE ABOVE CHARACTER BONDED TOGETHER INTO A GAS-TIGHT SLAB WITH THE FIBRES ORIENTED IN A REGULAR ARRAY WITH THEIR LONGITUDINAL AXES EXTENDING FROM ONE MAJOR SURFACE OF THE SLAB TO THE OTHER, THE SECOND AND THIRD WALLS BEING JUXTAPOSED SO THAT LIGHT GIVEN OFF BY THE FIRST PHOSPHOR LAYER PASSES ALONG THE LIGHT GUIDING FIBRES, OF THE SECOND AND THIRD WALLS IN SUCCESSION AND ACTIVATES THE SECOND PHOTO-SENSITIVE CATHODE LAYER, A SECOND PHOSPHOR LAYER DEPOSITED UPON A FOURTH WALL OF THE SECOND ENVELOPE, THE FOURTH WALL BEING IN THE FORM OF A BUNDLE OF LIGHT GUIDING FIBRES OF THE ABOVE CHARACTER BONDED TOGETHER INTO A GAS-TIGHT SLAB WITH THE FIBRES ORIENTED IN A REGULAR ARRAY WITH THEIR LONGITUDINAL AXES EXTENDING FROM ONE MAJOR SURFACE OF THE SLAB TO THE OTHER, MEANS FOR ACCELERATING ELECTRONS EMITTED BY THE SECOND PHOTO-SENSITIVE CATHODE LAYER SO THAT THEY BOMBARD THE SECOND PHOSPHOR LAYER, AND MEANS FOR FOCUSSING THE SAID ELECTRONS INTO AN IMAGE FORMING BEAM.