Ni-Fe base alloy sheet for use as a shadow mask and a shadow mas

Details Ni-Fe base alloy sheet for use as a shadow mask and a shadow mas Ni-Fe base alloy sheet for use as a shadow mask and a shadow mas

1987-11-30

1989-09-05

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

H01J 2907

Patent

active

048641880

ABSTRACT:
Disclosed is an Invar alloy original sheet for use in the production of a shadow mask, wherein the Invar alloy original sheet has the cleanliness measured by the method regulated in JIS G 0555, of 0.07% or less.
Disclosed is also a shadow mask comprising an Invar alloy original sheet having the cleanliness mentioned above.
By use of the Invar alloy original sheet of this invention, the problem of non-uniformity and irregurarity of inner wall surface of perforations formed on the original sheet for shadow mask is decreased to a great extent.

REFERENCES:
patent: 4724012 (1988-02-01), Inaba et al.

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