Stackable aperture masks

Details Stackable aperture masks Stackable aperture masks

1992-09-21

1995-01-17

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313403, H01J 2907

Patent

active

053828704

ABSTRACT:
A shadow mask for use in forming a television tube having a plurality of openings therein with the mask grade side having an average centerline roughness R.sub.ag, which is less than cone side average centerline roughness R.sub.ac so that when a plurality of aperture masks are stacked with the grade side of one mask in contact with the cone side of an adjacent mask, the greater roughness of the cone side provides sufficient spacing between the shadow masks to allow gasses to enter between the stacked masks to permit batch annealing of the stack of masks without having the stacked masks adhere to one another during the annealing process.

REFERENCES:
patent: 3916243 (1975-10-01), Brown
patent: 4048536 (1977-09-01), Brown
patent: 4300069 (1981-11-01), Nolan

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