| 摘要 |
<p>In an improved method of etching apertures (44) in a thin metal sheet (32) to form a shadow mask for a color picture tube, the metal sheet has a first acid-resistant stencil (38) on one major surface thereof and a second acid-resistant stencil (40) on the other major surface thereof. At least one of the stencils has openings (42) therein at locations of intended apertures. The improvement comprises the steps of magnetically holding the metal sheet with a flat magnetic assembly (30), and moving the magnetic assembly magnetically holding the metal sheet thereon through an etching chamber (12). The magnetic assembly includes a magnetic layer (36) that is supported on an acid-resistant board (34).</p> |
