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66 The PCB Magazine • November 2016 21, the non-rotated coupons from pass 1 and 2 performed poorly and the coupons with ro- tated prepreg had no fails through 350 hours. Additional CAF testing on samples with rotated prepreg and backdrilled vias at the initial and low cost geography manufacturing site had no fails through 500 hours. Final Implementation Figures 22 and 23 show the final bookbinder rigid-flex in flat form. The progressive lengths of the bookbinder can be seen. Figure 24 shows the product held in the 90-degree position—as it is positioned in the application. The align- ment of the progressive lengths can be seen. Figure 25 shows a 2-blade system with the covers and the scalability card removed. Two rigid-flex can be seen in the bottom right of the picture. Up to four blades could be connected. Figure 26 shows a close-up view of the in- terconnect area. The two rigid-flex that can be seen have been electrically and mechanically attached to planar boards 1 and 2 with LGA contacts and mechanical hardware. The flex make 90-degree bends and can float on the two diagonal standoffs on each flex. Figure 27 shows the LGA housing and LGA contacts on the scalability card. The two diago- nal tapered pins provide alignment between scalability card/LGA housing/LGA contacts and each rigid-flex. UNIQUE IMPLEMENTATION OF A RIGID-FLEX CIRCUIT Figure 21: CAF testing results. Figure 22: Rigid-flex with LGA contacts shown. Figure 24: Bookbinder layers in installed position. Figure 23: Rigid-flex with backside shown.

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