Interconnection of the two sides of a double-sided flexible circuits can also be completed mechanically. For many years, a number of methods have actually been developed. While all of the means have demonstrated functionality, the individual means are limited to applications where specs will permit their use. The following are some of the many techniques that

The different approaches for interconnecting two-metal layer flex PCB illustrated are not typical, yet stand for prospective solutions for factor to consider when tested with a special interconnection issue. can be utilized for many years to develop electromechanical connections.

Z WIRE INTERCONNECTION

The Z cord is an early forerunner of the plated through-hole.
It is simply a wire bent in the form of a Z as well as carefully soldered to interconnect both sides of the circuit. This strategy is typically used only for vias because various other through-hole links are achieved by the component leads themselves.

EYELETTING

Eyelets are one more early choice to the plated throughhole. Eyelets are the matching of small rivets with holes at their centers, like those discovered around shoe lace openings. Like Z wires, eyelets could make interconnection feasible in between sides of a two-sided circuit.

COOL WELDING

Cold welding, created by inventor Robert Lomerson, is an intriguing method for interconnecting both sides of a double-sided flex PCB. The technique calls for the fabrication of special devices and also manufacture of the flexible circuits according to a prescribed fashion. Long-term interconnection is acquired by pushing copper into copper through openings in the flexible circuits laminate, creating a metallurgical joint by chilly welding using the special etched or machined tools.