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Surface Treatment Alternatives Stiffener boards Thinness and bendability are the major advantages of flexible circuits. However, flexible circuits can lose mechanical strength when it is necessary as part of a composite assembly. The addition of stiffeners on flexible circuits is a practical solution to solve the conflicts, but appropriate stiffener board materials and adhesive materials have to be chosen based on the applications purposes. Figure 62.6 illustrates typical examples of the stiffener systems.The first one shows a stiffener construction for an insertion part into a connector. A stiffener adjusts the total thickness of the insertion part. Heat resistant materials, such as polyimide films, are not required for the construction. PET films with PSA (pressure-sensitive adhesive) could provide the low cost combination. A second example shows a case of the assembling of the traditional lead components. A relatively thick stiffener board, such as glass/epoxy, is bonded on the component side to support heavy parts. The soldering for the leads is conducted at the other side. Heat resistant materials including adhesives have to be chosen to survive the high temperature soldering process. Thermo-setting type adhesives should be chosen instead of PSA for the high reliability requirements. The third example indicates the case of SMT assembling. A thin heat resistant stiffener material such as polyimide film is bonded on the other side of SMT assembling.

Double-Sided Circuits with Via-Holes A double-sided flexible circuit can have the same through-hole structures for the traditional designs as rigid circuit boards. However, there are several critical differences in micro via holes on flexible circuits. Most of the differences come from a thin-film base substrate such as

polyimide film. Electrically plated copper conductors are much more brittle than rolledannealed copper foils; therefore, thin copper plating is preferred to maintain the flexibility of the circuits. Generally, sufficient through-hole reliability is established with 15-mm-thick copper plating. Copper plating should be eliminated from the dynamic flexing area by using a suitable masking method. Adhesiveless, copper-clad laminates that have simple and uniform substrate layers and smooth copper surfaces have become popular in high-density flex circuits. Because of thin film materials, there are several choices in small hole generation and copper plating processes. Flex circuits can contain both through-holes and blind via holes for double-sided circuits as shown in Fig. 62.7. Micro-size blind via holes on double-sided flex circuits confer the ability to make SMT assembly density much higher. The micro via hole capability depends on the process used by the manufacturer; however, general ideas are introduced in Chap. 61. Certainly the smaller via holes are available for the thinner substrates. Using the latest technology, such as excimer laser drilling, micro via holes smaller than 40 mm are available for 25-mm-thick adhesiveless polyimide base substrates. Microvia hole capabilities for polyimide substrates are shown in Fig. 62.8.

That is, if the rst event is simply given by the coordinates (t, x, y, z), then the second event is given by (t + dt, x + dx, y + dy, z + dz) In this case, it is clear that the differences between each term will give us (dt, dx, dy, dz) We write this in nitesimal interval as ds 2 = dt 2 dx 2 dy 2 dz 2 As we shall see, the form that the spacetime interval takes, which describes the geometry, is closely related to the gravitational eld Therefore it s going to become quite important to familiarize ourselves with the metric In short, the interval ds 2 , which often goes by the name the metric, contains information about how the given space (or spacetime) deviates from a at space (or spacetime).

FIGURE 62.8 Microvia capabilities shown by base thickness and hole diameter. Also shown is the range of technologies from HDI to mechanical drilling required to create the vias.

Basically, the same construction systems of coverlay, stiffeners, and surface treatments as single-side flexible circuits could be available for double-side flexible circuits.

Multilayer Rigid/Flex (Multilayer Flex) A simple, multilayer, flexible circuit does not make sense other than for its small thickness, because these circuits will not have any more flexibility Therefore, rigid/flexible constructions that contain both rigid parts and flexible parts have been developed A typical layer construction is illustrated in Fig 629 It is not a simple combination of flexible circuits and rigid circuits Generally, there are common flexible layers that are separated in the flexible parts A flexible layer of the flexible parts can have only one or two conductor layers to keep high flexibility At the rigid parts, the flexible inner layers are sandwiched by cap layers that consist of rigid circuit materials such as glass epoxy or glass polyimide The constructions of rigid parts are very similar to those of rigid multilayer circuits except for the thin polyimide dielectric layer inside.