Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1979-10-29
1982-12-07
Segal, Robert
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313412, H01J 2952, H01J 2956, H01J 2950
Patent
active
043629644
ABSTRACT:
There is disclosed an in-line type three-gun color picture tube with a couple of magnetic members inside its neck portion and a further magnet outside its neck portion. The respective magnetic members are provided with three through-holes permitting electron beams emitted from the electron guns to pass through and are disposed separately in a beam traveling path, so that the periphery of the through-holes of one of the magnetic members is magnetized in S pole and that of the other magnetic member is magnetized in N pole, and accordingly a focusing magnetic field is formed between the respective pairs of the through-holes which are opposite to each other. The magnetic pieces are disposed between the adjacent through-holes to intensify the magnetic field in the alignment of the through-holes which is weakened due to the presence of the through-holes, so that the focusing magnetic field in the alignment of the through-holes is compensated and accordingly the respective focusing magnetic fields become symmetrical with respect to their axes.
REFERENCES:
patent: 4057747 (1977-11-01), Hamano
patent: 4196370 (1980-04-01), Hughes
Fukuda Kyohei
Sakurai Soichi
Takata Masanobu
Hitachi , Ltd.
Segal Robert
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