Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1998-03-10
2000-10-10
Patel, Nimeshkumar D.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313407, 445 47, H01J 2980, H01J 912
Patent
active
061305006
ABSTRACT:
Provided with a shadow mask which is designed to suppress the doming effect by providing a shadow mask plate material for a color CRT having an ideal texture suitable for an etching to form the uniform profile of holes for the electron beams to pass through and thereby to prevent the etching deviation, the shadow mask plate material consisting of as main component Fe--Ni alloy, thus the shadow mask being characterized by the volume ratio of crystals with CUBE orientation being 2 to 20 times as high as that of crystals with (.beta.)-Fiber in the shadow mask plate material for the enhancement of etching property; and the method of manufacturing the shadow mask including the steps of hot-rolling and cold-rolling, thermal-refining and heat-treating the shadow mask raw material to obtain a shadow mask thin plate having the volume ratio of crystals with CUBE orientation being 2 to 20 times as high as that of crystals with (.beta.)-Fiber; and etching, forming and blackening the resulting shadow mask thin plate.
REFERENCES:
patent: 4528246 (1985-07-01), Higashinakagawa et al.
patent: 5236522 (1993-08-01), Fukuda et al.
Kim Sang Mun
Oh Myung Hoon
Park No Jin
LG Electronics Inc.
Patel Nimeshkumar D.
Williams Joseph
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