Method of making screens for cathode-ray tubes

Details Method of making screens for cathode-ray tubes Method of making screens for cathode-ray tubes

1973-11-13

1976-06-22

Newsome, John H.

Coating processes

Electrical product produced

Welding electrode

96 361, 156 13, 156 15, 313466, 427 43, 427 68, B05D 306, H01J 2932

Patent

active

039652785

ABSTRACT:
In the manufacture of screens for cathode-ray tubes, a substantial part of the screens being covered with a non-reflecting substance, hardened polyvinyl alcohol dots of relatively small diameter should be obtained by exposure via a mask with relatively large holes. Owing to an inadequate gradient of the photosensitive polyvinyl alcohol it is not possible to obtain dots of uniform size. The invention enables well-defined, uniform dots to be obtained by superposing a substance on the photosensitive layer which absorbs the light used during exposure, thereby decomposing into substances which do not or not substantially absorb this light. Thus, the effective gradient of the photosensitive polyvinyl alcohol is increased.

REFERENCES:
patent: 3615460 (1971-10-01), Lange
patent: 3615462 (1971-10-01), Szegho
patent: 3653939 (1972-04-01), Prazak
patent: 3712815 (1973-01-01), Rohrer et al.

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