Process of screening a shadow mask color tube
Abstract
Abstract THE SHADOW MASK OF A SHADOW MASK TYPE OF COLOR PICTURE TUBE IS SHEET OF STEEL OF A PARTICULAR THICKNESS THAT IS SELECTIVELY ETCHED TO DEFINE A RECTANGULAR FIELD OF APERTURES. EACH APERTURE HAS A DIAMETER EXCEEDING THE THICKNESS OF THE BLANK AND IS SURROUNDED BY AN ELEMENTAL AREA THAT IS PARTIALLY ETCHED TO CONSTITUTE A RECESSED OR REDUCED-THICKNESS PORTION OF THE BLANK, CONCENTRIC WITH THE APERTURE. THE TUBE IS SCREENED WITH PHOSPHORS DEPOSITED BY MEANS OF A PHOTOGRAPHIC PROCESS, INVOLVING THE EXPOSURE OF A LAYER OF PHOTOSENSITIVE MATERIAL BY ACTINIC ENERGY DIRECTED TO THE SCREEN THROUGH THE FIELD OF APERTURES. THEREAFTER, THE MASK IS RE-ETCHED, REMOVING A PORTION OF THE RECESSED ELEMENTAL AREA TO ENLARGE THE MASK APERTURES TO A DESIRED SIZE RELATIVE TO THAT OF THE PHOSPHOR DEPOSITS.
Inventors
- 👤 Sam H Kaplan
Bibliographic Details
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