Magnetic focusing type cathode ray tube

Details Magnetic focusing type cathode ray tube Magnetic focusing type cathode ray tube

1982-08-25

1984-12-25

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313412, 313442, 313443, H01J 2951, H01J 2964

Patent

active

044906447

ABSTRACT:
A magnetic focusing type cathode ray tube comprising a magnetic focusing device positioned in front of a three beam in-line type cathode for focusing the electron beam emitted from the cathode. The magnetic focusing device is constructed of a magnetic yoke assembly having a pair of magnetic yoke members. Each magnetic yoke member has three cylindrical magnetic yoke portions through which an electron beam can pass, and one common cylindrical magnetic yoke portion having a larger diameter which completely surrounds the three electron beam passages. The cylindrical magnetic yoke portions of the yoke members are spaced equidistantly, facing each other in the electron beam passages.

REFERENCES:
patent: 3866080 (1975-02-01), Barkow
patent: 4310780 (1982-01-01), Sakurai et al.
patent: 4362964 (1982-12-01), Sakurai et al.
patent: 4401917 (1983-08-01), Gerritsen

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