| 摘要 |
1,238,376. Coating substrates. WESTERN ELECTRIC CO. Inc. Aug.6, 1968 [Aug. 11, 1967], No.37434/68. Heading C7F. A transparent substrate is coated with a substantially uniform, pinhole-free coating of a metal by depositing a first layer of metal on the substrate, removing any loosely adhered particles of the metal by subjecting it to a blast of gas, and depositing a second layer of metal on said first metal layer. The substrate may be glass which is coated with a Cr layer 400-600A thick by vapour deposition, the layer is subjected to a blast of air at 60 p.s.i., and then coated with further Cr by vapour deposition to a total thickness of 800-1200Š The coated plate may be converted into a mask for use in photo-lithographic processes by application of a photo-resist, removal of exposed metal using HCl, H 2 SO 4 , or H 2 SO 4 and H 3 PO 4 , stopping the etching using NH 4 OH, and removal of the resist. |
