H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 29/58 (2006.01) H01J 29/48 (2006.01) H01J 29/62 (2006.01)
Patent
CA 2104875
2104875 9216007 PCTABS00016 A cathode ray tube comprising a cathode (K) for emitting a beam of electrons; a grid (G) for controlling the intensity of the beam; three or more anodes (A1, A3, A4); means for varying the potential of at least one of the anodes (A3) for focusing the beam to form a spot on a screen; and an additional, dynamic focus electrode (A2) maintained generally at a potential close to the cathode/grid potential. Suitable means may be included for applying to said dynamic focus electrode a high frequency signal to provide a rapid focus control means. Said dynamic focus means may comprise a plurality of circumferentially disposed segments and include means for applying a separate high voltage to each segment thus allowing the possibility of creating a quadrupole action in conjunction with at least one adjacent electrode, said segments covered with a deposited high-resistance conducting film to prevent charging effects. Preferably the potential of the first anode (A1) is substancially greater than the controlling voltage range of the grid (G), the potential of the static focus electrode (A3), interposed between the first and final anodes, is substantially equal to or lower than that of the first anode; and the potential of the final anode (A4) is substantially higher than that of the first anode (A1).
Banbury John Randolph
Fetherstonhaugh & Co.
The Secretary Of State For Defence In Her Britannic Majesty's Go
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