There is provided a multi-layer printed wiring board that can perform impedance control, concurrently maintaining the flexibility of a flexible portion with one or more signal lines. Such a multi-layer printed wiring board includes a plurality of rigid board units; and a flexible board unit, connecting...http://www.google.se/patents/US8102660?utm_source=gb-gplus-sharePatent US8102660 - Multi-layer printed wiring board, electronic device, and fabrication method of electronic device
