Shadow mask

Details Shadow mask Shadow mask

1986-10-27

1988-09-13

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313364, 148DIG51, 445 47, 156644, 156647, 156664, H01J 2907, C21D 946

Patent

active

047712139

ABSTRACT:
A cast ingot of an invar alloy is forged, hot-and cold-rolled, annealed and subjected to a controlled rolling to provide a shadow mask plate. An X-ray diffraction pattern is formed in an electron-beam hole-formation surface of the shadow mask plate, and a draft in a controlled rolling step is so controlled that the "g" value is 2 or more. The "g" value is given as

REFERENCES:
patent: 4528246 (1985-07-01), Higashinakagawa et al.
patent: 4612061 (1986-11-01), Suzuki et al.

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