Electric lamp and discharge devices – Cathode ray tube – Envelope
Patent
1999-10-20
2000-06-20
Patel, Vip
Electric lamp and discharge devices
Cathode ray tube
Envelope
31331801, 31331805, H01J 3100
Patent
active
060781343
ABSTRACT:
A cathode ray tube has a vacuum envelope including a panel portion having a phosphor screen, a neck portion having a stem fused and sealed to one end thereof, and a funnel portion for connecting the other end of the neck portion and the panel portion. The stem includes plural stem pins annularly arrayed, sealed thereto and extending therethrough for supporting an electron gun in the neck portion. An outside diameter of the neck portion in a region thereof facing a major portion of the electron gun is not more than 29.1 mm. 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 distance R1 and a second distance R2 satisfy a relationship, 0<R1-R2<2.1 mm, where the first distance R1 is a distance from the center axis of the neck portion to an inner wall in the region of the neck portion facing the major portion of the electron gun and the second distance R2 is a distance from the center axis to an outside edge of the stem mound as measured at half an axial height of the stem mound. The number of stem pins can be ten and the plural stem pins can include two stem pins for applying focus voltages to two focus electrodes of the electron gun.
REFERENCES:
patent: 4040707 (1977-08-01), Pisano
patent: 4504763 (1985-03-01), Nakanishi et al.
patent: 5777430 (1998-07-01), Ueda et al.
patent: 5818155 (1998-10-01), Kawamura et al.
Koumura Hidehiro
Nakamura Takao
Nose Hisashi
Hitachi , Ltd.
Patel Vip
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