In-line type electron gun assembly including electrode units hav

Details In-line type electron gun assembly including electrode units hav In-line type electron gun assembly including electrode units hav

1992-12-02

1995-05-09

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313458, H01J 2962

Patent

active

054143233

ABSTRACT:
An in-line type electron gun assembly has a cathode unit for producing a central electron beam and two side electron beams and first and second electrode units. Each of the first and second electrode units has a cylindrical member of a non-circular elongated cross section and a plate member provided on the inner wall of the cylindrical member so as to be joined therewith to define three electron beam passage holes juxtaposed, within the cylindrical member, in a direction parallel with a lengthwise direction of the elongated cross section of the cylindrical member. The plate member of each electrode unit has at least one hole therein serving as an electron beam passage hole for the central electron beam. The diameter of the hole in one of the plate members of the first and second electrode units measured in a direction perpendicular to the lengthwise direction of the elongated cross section of the cylindrical members is different from the diameter of the corresponding hole in the other plate member measured in a direction perpendicular to the lengthwise direction of the elongated cross section of the cylindrical members for optimizing the central electron beam shape and for emphasizing one of a focusing and diverging function.

REFERENCES:
patent: 4581560 (1986-04-01), Shirai et al.
patent: 4766344 (1988-08-01), Say
patent: 5146733 (1992-09-01), Shirai et al.

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