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US 4,752,353 AGranted
Method for transfer printing of TV shadow mask resist
AssigneeCorning Glass Works
InventorsWendell S. Blanding, Ronald E. Johnson, Robert V. VanDewoestine
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Abstract
An offset printing process is utilized for printing an acid resist ink onto both sides of a TV aperture mask. Printing is accomplished after the mask has been formed into an approximate spherical or cylindrical shape, and after a peripheral frame has been attached thereto. The resist ink employed is a pressure-sensitive hot-melt composition which forms an acid resistant film when deposited on the mask.
Claims6
A process for making a TV aperture mask comprising the steps of:
- providing a metal sheet;
- first forming said sheet into a desired shape having a curvilinear shadow mask portion with opposite complimentary front and back sides;
- then simultaneously registerably printing an acid resistant ink on said front and back sides of said curvilinear shadow mask portion of the metal sheet by depositing a pattern of ink on a transfer surface and then transferring the ink on to the metal sheet;
- selectively covering said curvilinear shadow mask portion with said acid resistant ink in a desired aperture pattern registerably aligned on said opposite front and back sides of said curvilinear mask portion;
- acid etching said mask in portions of said metal sheet not covered by said acid resistant ink;
- and producing apertures in a desired pattern through said metal sheet to form a TV aperture mask.
3 more elements
Dependencies are inferred from the claim text.