Electric lamp and discharge devices – Cathode ray tube – Image pickup tube
Patent
1981-07-20
1984-01-17
LaRoche, Eugene R.
Electric lamp and discharge devices
Cathode ray tube
Image pickup tube
313371, 313453, H01J 3126
Patent
active
044265999
ABSTRACT:
A television camera tube comprising, in an evacuated envelope, an electron gun to generate an electron beam which during operation of the tube is focused to form a spot on a photosensitive target. On the target, a potential distribution is formed by projecting an optical image on it. By scanning the target with an electron beam, signals corresponding to the optical image are produced. The target is scanned in a line deflection direction and a frame deflection direction. According to the invention, the spot has an elongate shape, which shape is determined by a line at the edge of the spot which interconnects points having the same current density. The shape of the electron spot is such that the ratio, k, between the lengths of the long and short axes of the spot is 1.4.ltoreq.k.ltoreq.2. The long axis of the spot divides the acute angle between the line deflection direction and the frame deflection direction in such manner that
REFERENCES:
patent: 3928784 (1975-12-01), Weijland
patent: 4268777 (1981-05-01), van Roosmalen
patent: 4382213 (1983-05-01), Kajimura et al.
"The `Plumbicon`, A New Television Camera Tube", E. F. de Haan et al., Philips Tech. Rev., vol. 25, No. 6/7, pp. 133.180 (1963/1964).
"An experimental light-weight colour television camera", P. H. Broesse et al., Philips Tech. Rev., vol. 29, No. 11, pp. 325-335 (1968).
Limper Nicolaas H.
Scheffers Cornelis J. W. M.
De Luca Vincent
LaRoche Eugene R.
Schecter Marc D.
U.S. Philips Corporation
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