Electric lamp and discharge devices – Cathode ray tube – Image pickup tube
Patent
1986-03-24
1990-11-13
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Image pickup tube
H01J 3126
Patent
active
049704290
ABSTRACT:
Picture pickup device comprising a television camera tube having an electron gun, and a photo-sensitive target in an evacuated envelope. An electron beam generated by the electron gun is focused by focusing means onto the target. The electron beam is deflected by deflection means and describes a line raster across the target. The electron beam forms an elongated spot on the target. The longitudinal axis of the spot is perpendicular to the lines of the raster and has a length which is substantially equal to the line spacing. The elongated spot is obtained with the aid of an adjustable multipolar stigmator which, viewed in the direction of propagation of the electron beam, is provided in front of the focusing and deflection means, coaxially around the axis of the envelope and the electron gun. The shape of the spot can be adjusted in an optimum manner so that stern waves are completely suppressed. It is possible to provide the stigmator in or around the tube and to adjust it by magnetization, if required, through the wall of the envelope.
REFERENCES:
patent: 4220897 (1980-09-01), Barten et al.
patent: 4382213 (1983-05-01), Kajimura et al.
patent: 4424466 (1984-01-01), Zeppenfeld
patent: 4468587 (1984-08-01), Sluyterman
patent: 4523124 (1985-06-01), Blanken et al.
Dekkers, N. H. "A Universal Deflection Unit Generating a Field of any Order and Azimuth." J. Phys. D; Appl. Phys., vol. 7, pp. 805-814, 12/1974.
Kurashige, M. "Formations of Elliptical Scanning Electron-Beam Cross Section for Removing Unscanned Area in High Resolution Camera Tubes." Electronics and Comm. in Japan, vol. 67-C, No. 2, pp. 54-61, 12/1984.
Botjer William L.
O'Shea Sandra L.
U.S. Philips Corp.
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