Method of reducing doming in a color display tube and a color di

Details Method of reducing doming in a color display tube and a color di Method of reducing doming in a color display tube and a color di

1987-04-17

1989-01-31

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, H01J 2907

Patent

active

048018422

ABSTRACT:
Thermal radiation reflectivity between the upright edge of the faceplate and at least the edge portion of the shadow mask is adjusted to obtain a desired temperature stabilisation level which avoids electron beam spot misalignment, such as by having selected areas of the upright edge non-aluminized while the remainder of the upright edge together with the back of the screen have a layer of aluminium thereon. The size, shape and disposition of the selected areas are chosen to obtain an optimum ratio of aluminized and non-aluminized glass surface which will provide a desired radiation coefficient. Typically at least 35% of the upright edge remains aluminized. In addition, a material having a high radiation coefficient, such as a low melting point glass with a high lead content, may be selectively applied to a peripheral portion of the shadow mask and the adjoining mounting frame.

REFERENCES:
patent: 4659958 (1987-04-01), D'Amato

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