| 摘要 |
985,244. Magnetic memory systems. RADIO CORPORATION OF AMERICA. Aug. 9, 1962 [Aug. 31, 1961], No. 30599/62. Heading H3B. A sheet of magnetic memory elements is produced by coating a metal sheet with etch resistant material, etching the sheet to form the elements and apertures and then coating the sheet so formed with a resilient insulating material before heating to a temperature which mechanically deteriorates the etch resistant material to remove any stresses produced in the elements. As shown, a sheet 26 is electroetched after applying a photoformed resist layer 28, 30 in such a pattern that apertures in the elements are etched from both sides of the sheet but the gap 38 between an element and the sheet are bridged by a web 30 of the resist material. The etching of an element ceases as soon as the gap 38 is etched through and the contact broken. A layer 40 of resilient material such as silicone rubber is then applied and the whole is heated to remove stresses in the elements. A thermoplastic 44 is then applied to the layer 40 and printed conductors 22, 24 are formed thereon. The unit is then heated to soften the thermoplastic 44 and prevent stresses being transferred from the conductors to the elements. The thermoplastic layer may be replaced by a silicone grease surrounded by a plastics layer, the final heating phase being then unnecessary. Examples of suitable materials and dimensions are given in the Specification. |
