Method utilizing a magnetic assembly during etching thin shadow masks
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United States of America Patent
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May 13, 2003
Grant Date -
Jun 13, 2002
app pub date -
Jul 10, 2001
filing date -
Jun 11, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In an improved method of etching apertures in a thin metal sheet to form a shadow mask for a color picture tube, the metal sheet has a first acid-resistant stencil on one major surface thereof and a second acid-resistant stencil on the other major surface thereof. At least one of the stencils has openings therein at locations of intended apertures. The improvement comprises the steps of magnetically holding the metal sheet with a flat magnetic assembly, and moving the magnetic assembly magnetically holding the metal sheet thereon through an etching chamber. The magnetic assembly includes a magnetic layer that is supported on an acid-resistant board.
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