Abstract: A monotube CRT includes an envelope which comprises a first section that houses the electron gun and a second section that houses a fiber optics faceplate along a sidewall. An array of electromagnets is disposed along the second section for deflecting the electron beam from its longitudinal path through the envelope transversely to trace a linear scan on the faceplate. The first section of the envelope is a circular cylinder whose axis is coaxial with the longitudinal path of the electron flow. The second section of the envelope is essentially rectangular or elliptical in cross section and the undeflected beam flows adjacent one narrow sidewall opposite the sidewall housing the faceplate. Each electromagnet of the array includes a core portion adjacent said one narrow sidewall and pole pieces that flank the wide sidewalls of the section.

Abstract: A cathode ray tube useful as a transducer in a recording system is provided with a cylindrical envelope whose length is much longer than its width. An electron gun at one end of the envelope provides an electron beam directed for flow along the longitudinal axis of the envelope. A fiber optics faceplate is positioned to extend longitudinally in a sidewall of the envelope. The inner surface of the faceplate is coated with an electron-sensitive coating and the outer surface is positioned in contact with a recording medium. An array of electromagnets are positioned along the envelope and when energized the electron beam is deflected for repetitive linear scan of the faceplate. For relaxing the requirements of the deflecting system, various techniques are described, including modification of the tube envelope.

Abstract: A cathode ray tube useful as a transducer for converting electrical signal information into a visual pattern on a recording medium uses a cylindrical envelope along which a signal modulated beam is projected. A fiber optics plate is positioned along the sidewall of the envelope and the beam is swept in a liner scan of the fiber optics plate by an array of electromagnets, positioned along the envelope and properly excited to deflect the beam appropriately. For monitoring the properties of the electron beam, the inner surface of the end plate of the envelope is provided with a patterned coating of luminescent material on which the electron beam is incident when undeflected by the array of electromagnets. Sensors are provided for measuring the flux distribution for monitoring the properties of the electron beam.