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

1999-03-31

1999-11-30

Patel, Vip

Electric lamp and discharge devices

Cathode ray tube

Envelope

31331801, 31331805, H01J 3100

Patent

active

059948302

ABSTRACT:
A cathode ray tube includes a panel portion having a phosphor screen, a neck portion having a stem fused and sealed to one end thereof, the stem having a plurality of stem pins annularly arrayed, sealed thereto and extending therethrough for supporting an electron gun in the neck portion and a funnel portion for connecting the other end of the neck and panel portions. A stem mound is raised and formed integrally with the stem around a base of each of the stem pins on an electron-gun-supporting side thereof. A first R1 is defined as a distance from a center axis of 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 tide edge of the stem mound, measured at half an axis of the stem mound, the first distance R1 and the second distance R2 satisfy a relationship, 0<R1-R2<2.1 mm. A wall thickness of a region of the neck portion in the vicinity of the fused and sealed regions of the neck portion and the stem is smaller than a wall thickness of a region of the neck portion facing the major portion of the electron gun.

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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