Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1996-05-06
1999-12-21
Day, Michael
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313414, H01J 2976
Patent
active
060053399
ABSTRACT:
A cathode ray tube includes an electron gun having a plurality of electrodes, an electron beam deflection device and a phosphor screen. A method of correcting deflection defocusing in the cathode ray tube includes placement of pole pieces of magnetic material in a deflection magnetic field produced by the electron beam deflection device and thereby establishing a non-uniform magnetic field varying in synchronism with the deflection magnetic field in a path of an electron beam and correcting deflection defocusing of the electron beam corresponding to deflection of the electron beam in amount. The pole pieces are disposed within 50 mm from a magnetic core of the electron beam deflection device toward a cathode of the electron gun.
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Day Michael
Hitachi , Ltd.
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