| 摘要 |
1,254,677. Circuit assemblies; fluid-pressure actuated switches. INTERNATIONAL BUSINESS MACHINES CORP. 27 May, 1970 [29 May, 1969], No. 25405/70. Headings H1N and H1R. [Also in Division H2] Recessed contacts 32 of a flexible composite sheet 16 are moved to contact terminal points 28 of an integrated circuit 30, which is to be tested by equipment connected to the ends of electrically conductive strips 26 remote from the contacts 32, by increasing fluid pressure in a pressure chamber 10 of which the sheet 16 forms one wall. The sheet 16 is clamped peripherally between a plastics collar 18 and the rim 14 of the pressure chamber and comprises a dielectric membrane 22 having strips 26 on its outside surface remote from the fluid 12 and a ground plane 24 on its inside surface, the impedance between the ground plane and each strip 26 being designed to match the test equipment to the integrated circuit 30. A further dielectric layer 62 and at least one electrically conductive strip 64 may be provided on the inside surface of the sheet 16 to provide at least one further contact 66 within the boundary of the contacts 32. Electronic components such as diodes, transistors (46, Fig. 3, not shown) and integrated circuits may be mounted on the sheet 16 and be connected to the strips 26. The dielectric membrane may be of polyethylenephthalate or p.t.f.e., the ground plane of copper and the strips 26, 64 of copper, gold or silver palladium alloy. The strips are made by conventional photo-resist and etching methods. Reference has been directed by the Comptroller to Specification 1,104,090.
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