Virtual mask exposure system for CRT screen manufacture

Details Virtual mask exposure system for CRT screen manufacture Virtual mask exposure system for CRT screen manufacture

1977-12-27

1980-09-16

Kimlin, Edward C.

Radiation imagery chemistry: process, composition, or product th

Producing cathode-ray tube or element thereof

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

430 5, 430394, 430396, G03C 500

Patent

active

042230837

ABSTRACT:
An improved method of screening a color cathode ray tube of the shadow mask type is disclosed. The shadow mask is used to form a corresponding virtual mask on the outer or viewing surface of the CRT faceplate. The virtual mask then is employed as a substitute for the shadow mask in the subsequent photoprinting of a color display screen on the faceplates's inner surface. Advantages include reduced handling of the fragile shadow mask, which reduces the costs associated with replacing such masks if they become damaged, and better defined and registered phosphor deposits.

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