Cathode ray tubes to facilitate recording

Claim 2

A cathode ray tube comprising: an envelope having first and second output portions; a gun for generating an electron beam including means for modulating the beam; deflection means for deflecting the beam at any instant to either of two paths so that the modulated beam defines corresponding image elements at said first and second output portions of said envelope; said first output portion of said envelope carrying a luminescent screen to provide a visible monitoring image; and said second output portion of said envelope including a multiplicity of elements for transferring elements of the image from the internal surface of said second output portion of said envelope to the external surface thereof to facilitate recording of the image on a sensitised sheet presented to said external surface.

Claim 3

A cathode ray tube in accordance with claim 1, in which said multiplicity of elements at said second output portion consists of fibre optics having a phosphor material coated on their inner surfaces.

Claim 4

A cathode ray tube in accordance with claim 2, in which the fibre optics together form a narrow strip in the tube envelope.

Claim 5

A cathode ray tube in accordance with claim 1, in which said multiplicity of elements at said second output portion consists of electrically conductive particles in the tube envelope capable of transferring an electric charge from said beam to said external surface of said second output portion so that characters may be electrically recorded on a sensitised sheet at said external surface.

Claim 6

A cathode ray tube in accordance with claim 1, in which the part of the envelope on which said second output portion is formed is in a side wall of the envelope.

Claim 7

A cathode ray tube in accordance with claim 1, in which both the first and second output portions of the envelope are formed are in the front wall of the envelope.

Claim 8

Cathode ray tube apparatur comprising: a cathode ray tube including an envelope having first and second output portions, and also including a gun for generating an electron beam including means for modulating the beam, and beam-deflecting members; deflection-control means connected to said beam-deflecting members for deflecting the electron beam at any instant to either of said first and second output portions to define similar image elements at said first and second portions; said first output portion of said envelope carrying a luminescent screen to provide a visible monitoring image; and said second output portion of said envelope including a multiplicity of elements for transferring elements of the image from the internal surface of said second output portion of said envelope to the external surface thereof to facilitate recording of the image on a sensitised sheet; and means for presenting a sensitised sheet to said external surface of said second output portion of said envelope.

Claim 9

Cathode ray tube apparatur comprising: a cathode ray tube including an envelope having first and second output portions, and also including a gun for generating an electron beam including means for modulating the beam, and beam-deflecting members; deflection-control means connected to said beam-deflecting members for deflecting the electron beam at any instant to either of said first and second output portions to define similar image elements at said first and second portions; said first output portion of said envelope carrying a luminescent screen to provide a visible monitoring image; and said second output portion of said envelope including a multiplicity of elements for transferring elements of the image from the internal surface of said second output portion of said envelope to the external surface thereof to facilitate recording of the image on a sensitised sheet; and means for presenting a sensitised sheet to said external surface of said second output portion of said envelope.

Claim 10

Apparatus in accordance with claim 7, in which said deflection-control means deflects said electron beam over only a narrow strip at said second output portion of said envelope.

Claim 11

Apparatus in accordance with claim 8, in which said seconD output portion of said envelope consists of a narrow strip including a multiplicity of fibre optics elements, the apparatus further including a roller positioned adjacent the external surface of said second output portion of the envelope and means for passing a record material over the roller substantially in contact with said fibre-optics strip.

Claim 12

Cathode ray tube apparatus including a cathode ray tube in accordance with claim 1, further including a manually operable switch to permit the beam to be deflected to form an image on said second output portion of the envelope when required by an operator watching the monitoring first output portion of the envelope.

Claim 13

Cathode ray tube apparatus including a cathode ray tube in accordance with claim 1, including switching means for deflecting the beam between said first and second output portions of said envelope alternately at high speed so that the image elements at said two output portions are formed substantially simultaneously.