Shadow mask of the nickel-iron type having specific composition

Details Shadow mask of the nickel-iron type having specific composition Shadow mask of the nickel-iron type having specific composition

1997-11-13

1998-09-22

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313405, H01J 162

Patent

active

058119183

ABSTRACT:
A method of manufacturing a shadow mask of the nickel-iron type, in which an aperture-patterned sheet of a nickel-iron alloy comprising 35-37% by weight of Ni and less than 0.1% by weight of each constituent of the group of Mn, Cr and Si and at most 0.9% by weight of Co is given a thermal treatment for obtaining an ASTM grain number of .gtoreq.7, and the sheet thus obtained is given the desired shape of a shadow mask having a thermal expansion coefficient of .ltoreq.0.9.times.10.sup.-6 /.degree.C.

REFERENCES:
patent: 4685321 (1987-08-01), Van Den Berg et al.

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