Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1996-07-03
1999-01-19
O 'Shea, Sandra
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
313422, 313497, 3151691, H01J 2968
Patent
active
058617124
ABSTRACT:
An electron source having a cathode and a permanent magnet perforated by a plurality of channels extending between opposite poles thereof. The magnet generates, in each channel, a magnetic field which forms electrons received from the cathode into an electron beam for guidance towards a target. An electrode grid is disposed between the cathode and the magnet for controlling flow of electrons from the cathode into each channel. A magnetic field null region of each magnetic field is positioned at a location remote from the electrode grid. Because the null region is positioned remotely from the grid electrodes, flow of electrons can be improved without increasing electrode drive voltage.
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Beetson John
Knox Andrew
Day Michael
International Business Machines - Corporation
Morris Daniel P.
O 'Shea Sandra
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