Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1998-07-08
2000-12-26
Day, Michael H.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313409, 313412, 313449, 315 14, 315382, 3153821, 31536815, H01J 2950
Patent
active
061664839
ABSTRACT:
An internal resistor within a color cathode ray tube (CRT) is connected to a voltage source and is coupled across a G4 grid and a G6 grid of the CRT's multi-grid quadrupole (QPF) electron gun. De-coupling the G4 grid from the G2 grid in the electron gun's prefocus lens and operating the G4 grid at a higher voltage as used in the gun's high voltage main focus lens moves the equivalent lens of the prefocus and main focus lenses toward the CRT's display screen and reduces electron beam magnification and spot size for improved video image definition and focusing.
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Chen Hsing-Yao
Yeh Chun-Hsien
Chunghwa Picture Tubes Ltd.
Day Michael H.
Santiago Mariceli
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