Color display tube including a shadow mask sheet with a bulged p

Details Color display tube including a shadow mask sheet with a bulged p Color display tube including a shadow mask sheet with a bulged p

1984-08-20

1985-11-05

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313404, H01J 2902, H01J 2907

Patent

active

045516510

ABSTRACT:
A shadow mask (20) for a color display tube is formed from one piece. Each side of the shadow mask (20) comprises a bulged portion (23) with a collar (24). Having a center of mass which when viewed in a cross-section perpendicular to the side, is situated substantially in the plane of the shadow mask sheet (21). As a result of this no moments are exerted on the shadow mask (20) when vibrations and shocks occur, so that the mask is not deformed. The angle which the collars (24) make with the longitudinal axis of the display tube is such that electrons reflected at a collar (24) do not land within the pattern of apertures (22) on the shadow mask (20). A magnetic screening cap adapted to the shadow mask construction is also constructed so that electrons reflected at the cap do not land within the pattern of apertures (22) of the shadow mask (20).

REFERENCES:
patent: 3935496 (1976-01-01), Gijrath
patent: 4191909 (1980-03-01), Dougherty

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