Resilient spring contact structures are manufactured by plating the contact structures on a reusable mandrel, as opposed to forming the contact structures on sacrificial layers that are later etched away. In one embodiment, the mandrel includes a form or mold area that is inserted through a plated through...http://www.google.com.hk/patents/US20060085976?utm_source=gb-gplus-share專利 US20060085976 - Electroform spring built on mandrel transferable to other surface
