Structure and method for eliminating blocked apertures caused by

Details Structure and method for eliminating blocked apertures caused by Structure and method for eliminating blocked apertures caused by

1981-07-28

1984-02-14

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313481, 455 2, 455 55, H01J 2907, H01J 2994, F01J 920

Patent

active

044319398

ABSTRACT:
A structure and method is proposed for eliminating so-called halo-blocked apertures in color picture tubes. The halo-blocked apertures are caused by insulative negatively-charged particles attached to the gas-sorbing conductive getter metal film on the inside surface of the shadow mask which deflect the transmitting portions of an electron beam. The structure comprises a source within the tube for depositing a gas-sorbing conductive getter metal overlay on the charged particle to render the particle conductive so that the particle cannot deflect the beam.

REFERENCES:
patent: 3131983 (1964-05-01), Harries
patent: 3329853 (1967-07-01), Neuhauser
patent: 3387908 (1968-06-01), Fogelson
patent: 3508105 (1970-04-01), Pappadis
patent: 3711734 (1973-01-01), Yamazaki et al.
patent: 3712699 (1973-01-01), Syster
patent: 3781076 (1973-12-01), Dietch et al.
patent: 3792300 (1974-02-01), Benda et al.
patent: 4006381 (1977-02-01), Thall
patent: 4398897 (1983-08-01), Nubani et al.

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