Method of forming a fluorescent screen for a color picture tube

Details Method of forming a fluorescent screen for a color picture tube Method of forming a fluorescent screen for a color picture tube

1980-02-28

1982-04-13

Brown, J. Travis

Radiation imagery chemistry: process, composition, or product th

Producing cathode-ray tube or element thereof

Using specific control or specific modification of exposure,...

430 25, 430 28, 430144, 430394, 430396, 430494, 430952, 354 1, G03C 500

Patent

active

043248500

ABSTRACT:
In forming a fluorescent screen for a color picture tube having triads of phosphor materials of the three primary colors arranged in a predetermined pattern on the inner surface of a panel, a photosensitive film which exhibits stickiness when exposed to a threshold amount of light is formed on the inner surface of the panel. Locations of the photosensitive film where the three color phosphor materials respectively occupy are exposed to light from a light source through a shadow mask mounted to the panel. The amount of exposure light for a first color phosphor material is the threshold or above and that for second and third phosphor materials is below the threshold. After completion of the light exposures for the first to third color phosphor materials through the shadow mask, the shadow mask is dismounted from the panel and the first color phosphor material is deposited onto the photosensitive film. A first back exposure is then carried out and the second color phosphor material is deposited onto the photosensitive film. Thereafter, a second back exposure is carried out and the third color phosphor material is deposited onto the photosensitive film.

REFERENCES:
patent: 4045224 (1977-08-01), Yamazaki et al.

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