Picture tube with an electron gun having non-circular aperture

Details Picture tube with an electron gun having non-circular aperture Picture tube with an electron gun having non-circular aperture

1980-10-16

1983-08-16

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313449, 313460, H01J 2946, H01J 2950, H01J 2956

Patent

active

043993885

ABSTRACT:
In a picture tube comprising an envelope including a phosphor screen and an electron gun generating an electron beam, wherein the electron beam is deflected by magnetic deflecting fields, the electron gun comprising a triode section and a focusing section along a path of the electron beam, the triode sections being provided with an electrode containing a non-circular aperture having major and minor axes of symmetry, the major axis being parallel to a horizontal direction the focusing section having a means for forming an electrostatic focusing lens having a vertical focal length and a horizontal focal length, said vertical focal length more elongated than said horizontal focal length.

REFERENCES:
patent: 3497763 (1970-02-01), Hasker
patent: 3524094 (1970-08-01), Hasker et al.
patent: 3919583 (1975-11-01), Hasker et al.
patent: 4143293 (1979-03-01), Hosokoshi et al.
patent: 4322655 (1982-03-01), Takenaka et al.

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