H - Electricity – 01 – J
Patent
H - Electricity
01
J
148/31, 38/4
H01J 9/14 (2006.01) C21D 8/02 (2006.01)
Patent
CA 1241258
ABSTRACT: A shadow mask sheet for a colour display tube consisting of a nickel-iron alloy is drape drawn by means of a drawing process. Prior to the drawing process the shadow mask sheet is subjected to an annealing treatment between 700 and 820°C so as to pro- duce complete recrystallisation without grain growth of any significance. During the drawing process the shadow mask sheet is maintained at a temperature between 150°C and 250°C, a 0.2 % proof stress of the shadow mask material between 150 and 250°C being reached below a tensile stress of 150 N/mm2.
491592
Thompson-Russell Kathryn C.
Ven Den Berg Adrianus H.m.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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