摘要:
A method of making a flexible circuit member including a stainless steel base member, a dielectric layer (polyimide) on the base member and a conductive circuit (copper) on the dielectric. The circuit member may be first formed as a laminate structure wherein the dielectric polyimide is coated on the stainless steel and appropriately treated (cured). The copper circuitry is then formed utilizing resist application and exposure techniques. Significantly, the copper-containing circuitry and stainless steel base member are simultaneously etched using a cupric chloride etchant solution to effectively remove desired portions of these metallic materials and produce the desired flexible circuit member.
摘要:
A flexible supporting cable for an electronic device which includes a steel foil substrate, a layer of polymer on portions of the substrate, circuit pads on the polymer layer having both the bottom and top surfaces of the pads exposed; circuit lines extending from the top surface of the pads, a window free from steel beneath a portion of the circuit lines, and a second, smaller window free from both steel and the polymer beneath a portion of the circuit lines. Methods are provided for fabricating these flexible supporting cables.