Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1999-10-20
2000-08-08
Patel, Vip
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313412, 313426, 313427, G01J 2950
Patent
active
061006319
ABSTRACT:
A color cathode ray tube includes an electron gun for generating and focusing three in-line electron beams, and a pair of electrodes disposed down stream of a pre-focus lens and forming a final main lens. Each of the pair of electrodes have a common single opening for the three in-line electron beams in an end thereof opposing another of the pair of electrodes. A shield cup is fixed to a final electrode of the electron gun and has applied thereto the same potential which is applied the final electrode, the shield cup having a single aperture common to the three in-line electron beams. A focusing action of the pre-focus lens and a focusing action of the main lens are different between a center electron beam and a side electron beam of said three in-line electron beams, respectively.
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Hitachi , Ltd.
Patel Vip
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