Cathode-ray tube

Details Cathode-ray tube Cathode-ray tube

2006-01-17

2006-01-17

Philogene, Haissa (Department: 2828)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

C315S411000, C315S368150, C313S414000, C313S449000

Reexamination Certificate

active

06987367

ABSTRACT:
A prefocus lens section in an electron gun assembly includes a second grid that is disposed on an electron beam generating section side, a third grid that is disposed on a main lens section side, and a shield grid that is disposed between the second grid and the third grid. The shield grid is a cup-shaped electrode with a side wall that surrounds an outer peripheral part of the third grid, which part is located on the second grid side, and extends in parallel to a tube axis. The shield grid has a bottom surface disposed to face the second grid and has an open end disposed to face the third grid. A relationship, Ec<Vf<Er, is established, where Ec is a potential applied to the second grid, Vf is a potential applied to the shield grid, and Er is a potential applied to the third grid.

REFERENCES:
patent: 4742279 (1988-05-01), Gerritsen et al.
patent: 4935663 (1990-06-01), Shimoma et al.
patent: 4967120 (1990-10-01), Katsuma et al.
patent: 5262702 (1993-11-01), Shimoma et al.
patent: 48-38973 (1973-06-01), None
patent: 50-158274 (1975-12-01), None
patent: 2000-331624 (2000-11-01), None

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