摘要:
A metalization process for the manufacture of hybrid integrated circuit elements including boards and semiconductors to be attached thereto involves applying to a substrate of insulating material such as aluminum oxide, successive layers of sputtered nickel-chromium and nickel, an electroless deposit of nickelboron and, frequently, an electro-deposited layer of gold. The assembly is then normally heat-treated to stabilize the resistive layer. The addition of the nickel-boron layer provides many advantages in that reliable low-temperature solder connections may be made to it, ultrasonic wire bonds of high reliability may be accomplished with the usual aluminum wire supplied with most discrete components, the heat-treating step is considerably shortened in time with greater stability of resistance values, and the assemblies thus manufactured are capable of operating in comparatively high-temperature environments. The same metalization process applied to semiconductors renders them easily solderable and avoids using high temperature eutectic bonding with the accompanying exposure of the semiconductors to elevated temperatures, often for prolonged periods. As a result, circuit assemblies thus manufactured are readily repairable, in most instances, since no high-temperature bonds are required.
摘要:
An antenna and method of manufacture are described in which a spiral microwave antenna is formed over a domed substrate of epoxy glass resin. A copper foil member is formed over a die by spinning or burnishing to a domed configuration matching that of the substrate. The copper member is then given a coating of primer and clamped over the substrate which has been coated with an epoxy cement, and the assembly subjected to heat and pressure sufficient to bond the foil to the substrate. The assembled antenna blank is then coated with photo-resist material and illuminated from a source of collimated light through a photo negative which is carefully centered to expose the desired spiral pattern on the photo-resist material. The photo-resist is then developed and rinsed, and the blank is baked to harden the exposed photo-resist. The blank is then etched to remove the unwanted copper, leaving the desired antenna pattern. The copper pattern is then preferably plated with tin and the assembly trimmed and drilled as desired.