Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1997-05-14
1999-09-21
Patel, Vip
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313428, 313421, 335212, H01J 2970, H01J 2954, H01J 2968
Patent
active
059558300
ABSTRACT:
A cathode ray tube has a convergence regulating means 7, positioned on the periphery of a neck portion 1B, which is used for regulating the orbit of each electron beam emitted from electron guns contained in the neck portion 1B of the CRT envelope. The convergence regulating means 7 is equipped with high magnetic permeability members 18 for preventing the electron beam from being affected by terrestrial magnetism. Each of the high magnetic permeability members is spaced from the outer peripheral face of the envelope without direct contact therewith. With this arrangement the glass of the neck portion is prevented from deterioration.
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Gerike Matthew T.
Hitachi , Ltd.
Patel Vip
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