Color picture tube having improved corrugated apertured mask

Details Color picture tube having improved corrugated apertured mask Color picture tube having improved corrugated apertured mask

1979-11-15

1981-10-06

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907

Patent

active

042937914

ABSTRACT:
The present invention provides an improvement in a corrugated apertured mask type color picture tube. The mask corrugations are substantially parallel and the mask has slit shaped apertures aligned in columns which are parallel to the mask corrugations and perpendicular to a major axis of the mask. The slits in each column are separated by web portions of the mask. The distance between the centers of two consecutive webs is defined as the web repeat distance. The slits form an aperture array wherein the lengthwise dimension of the slit columns vary with location on the mask. The tube also includes an electron gun for generating a plurality of electron beams and means for scanning the beams in lines across the mask. The improvement comprises making the web repeat distance within a slit column proportional to the distance from the major axis of the mask to the mask intercept of any particular scan line.

REFERENCES:
patent: 3731129 (1973-05-01), Tsuneta et al.
patent: 3766419 (1973-10-01), Barbin
patent: 3973159 (1976-08-01), Barten
patent: 4072876 (1978-02-01), Morrell
patent: 4127791 (1978-11-01), Van Lent
patent: 4173729 (1979-11-01), Stone et al.
patent: 4195248 (1980-03-01), D'Amato et al.

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