Color cathode ray tube having a small neck diameter

Details Color cathode ray tube having a small neck diameter Color cathode ray tube having a small neck diameter

1998-11-02

1999-06-01

Patel, Ashok

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313460, H01J 2951, H01J 2962

Patent

active

059090804

ABSTRACT:
A color cathode ray tube includes an evacuated envelope formed of a panel portion having a phosphor screen, a neck portion and a funnel portion connecting the panel portion and the neck portion, and an in-line electron gun housed in the neck portion. The in-line electron gun includes a main lens and an electrostatic quadrupole lens. The focus electrode of the electron gun has a single opening at one end thereof for passing the three electron beams and opposes an anode to form a main lens therebetween. The single opening has a diameter larger in a horizontal direction than a diameter thereof in a vertical direction. A distance from the main lens to the phosphor screen is not larger than 300 mm, an outer diameter T of the neck portion housing the in-line electron gun satisfies the following inequality: 23.2 mm.ltoreq.T.ltoreq.25.9 mm, and a value D of twice a distance from a center of a trajectory of a side electron beam of the three electron beams to a horizontal edge of the single opening satisfies the following inequality: 5.0 mm.ltoreq.D.ltoreq.6.5 mm.

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patent: 5488265 (1996-01-01), Chen
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