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

1997-10-14

1999-08-24

Patel, Ashok

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313460, H01J 2951, H01J 2962

Patent

active

059428449

ABSTRACT:
A color cathode ray tube has a phosphor screen and an in-line electron gun. Each of the focus electrode and the anode of has a single opening for passing three electron beams. The single opening has a diameter larger in a horizontal direction than a diameter thereof in a vertical direction. Each of the focus electrode and the anode has a plate electrode placed therein and forming apertures for passing the three electron beams respectively. The focus electrode and the anode forms a main lens therebetween. The distance from the main lens to the phosphor screen is 360 mm or less, the outside diameter T in mm of the neck portion of the evacuated envelope housing the electron gun satisfies 23.5 mm.ltoreq.T.ltoreq.25.3 mm, the value D in mm of twice the distance from the center of a trajectory of a side electron beam to a vertical edge of the single opening in each of the focus electrode and the anode satisfies 6.5 mm<D.ltoreq.8.3 mm, and the center-to-center spacing S in mm between two adjacent electron beams satisfies T-15.5 mm.gtoreq.2S.

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patent: 5300855 (1994-04-01), Kweon
patent: 5488265 (1996-01-01), Chen

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