Narrow-neck CRT having a large stem pin circle

Details Narrow-neck CRT having a large stem pin circle Narrow-neck CRT having a large stem pin circle

1997-08-25

1999-04-27

O'Shea, Sandra

Electric lamp and discharge devices

Cathode ray tube

Envelope

31331805, H01J 3100, H01R 1346

Patent

active

058982647

ABSTRACT:
A cathode ray tube includes a vacuum envelope formed of a panel portion having a phosphor screen on its inner surface and suspending a shadow mask therein, a neck portion having a stem sealed to one end thereof and a funnel portion for connecting the other end of the neck portion and the panel-portion. The stem has a plurality of stem pins annularly arrayed, sealed thereto and extending therethrough for supporting an electron gun in the neck portion. A stem mound is raised and formed integrally with the stem around a base of each of stem pins on a electron-gun-supporting side thereof. A first distance R1 is defined as a distance from a center axis of the neck portion to an inner wall in a region of the neck portion facing a major portion of the electron gun, a second distance R2 is defined as a distance from the center axis to an outside edge of the stem mound, measured at half an axial height of said stem mound, and a third distance is defined as a distance from an inner wall to the center axis. The third distance is not smaller than the first distance R1 at least in a region of the neck portion facing the stem mounds except in the vicinity of fused and sealed regions of the neck portion and the stem, and the first R1 distance and the second distance R2 satisfy a relationship, 0<R1-R2<2.1 mm.

REFERENCES:
patent: 4504763 (1985-03-01), Nakanishi et al.
patent: 5777430 (1998-07-01), Ueda et al.
patent: 5818155 (1998-10-01), Kawamura et al.

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