Mask e.g. photo mask, fabricating process for e.g. antenna, involves thermoforming sheets to obtain mask by separating, on thickness of one sheet and by laser removal, etching or sand blasting, of windows opening on another sheet

摘要

The process involves disposing a sheet (5) opposite to a cavity of a rigid mold reproduced identical to a three dimensional dielectric substrate. The sheet is covered with a sheet (6). The sheets are thermoformed to obtain a mask (7). The mask is obtained by separating, on the entire thickness of the sheet (5) and by laser removal, etching or sand blasting, of windows (8) which open on the sheet (6) and correspond to functional units. POLYMERS - The sheets are made of plastic materials that are selected from polyacrylic compounds such as methyl polymethacrylate, styrenic compounds such as copolymers of acrylonitrile-butadiene and high-impact polystyrene, polyolefins such as polyethylene or polypropylene, polyvinyl chloride, polycarbonate and polyester.