Designing Flexible Printed Circuit Boards
A Few Unusual Circuits
1，Single-sided flexible circuits that have one conductive layer of copper on a dielectric (insulating) material. These circuits are simple circuits that could be used in a hinge circuit on a laptop computer or maybe on the hinge of a flip open phone. These can be built by a number of different fabricators.
2，Double-sided circuits with copper on both sides of the dielectric. These have similar applications as above, but are used where more interconnections are required in a small space.
3，Flexible circuits with several layers. Each is registered to the other layers and bonded together with a suitable adhesive cured layer. The layers are all interconnected by plated throughholes. The number of flex layers can be up to the engineer's imagination, but too many layers and too much copper will turn it into a rigid board.
4，Sculptured flexible circuits are single or double-sided designs with thicker copper to allow connections such as fingers or pads as rigid extensions of the flexible conductors. These circuits have thicker copper plated on exposed areas where the conductors could be inserted into a mating connector.
5，Molded flex are flex circuits that are thermally molded into simple shapes. A good example of this would be a formed dome on a flexible circuit.
6，Multi-layer rigid flex circuit boards combine flex circuits and rigid boards where the flex circuit extends from the rigid board area. These boards are the most complex and are used to interconnect two or more rigid or multilayer boards together.
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Below you will find our rigid-flex manufacturing process. Including, material preparations, etch, drilling, plating, to