Abstract:
PROBLEM TO BE SOLVED: To provide a load board and a method of manufacturing the same.SOLUTION: A method of manufacturing a load board comprises the steps of: preparing a semiconductor substrate having a first surface, a second surface, and at least one through holes communicating with the first surface and the second surface; electrically plating an electroplating polymer layer on the first surface, the second surface, and the inner walls of the through holes; and forming a circuit layer extending from the first surface to the second surface via the inner walls of the through holes on the electroplating polymer layer. The manufacturing method forms an insulating layer or the electroplating polymer layer of the load board by electroplating, thereby effectively reducing the manufacturing cost.
Abstract:
An intermediate material which is adapted to manufacture a circuit board includes a prepreg sheet having a through-hole provided therein, a first film provided on a surface of the prepreg sheet and having a first hole communicating with the through-hole, a second film provided on another surface of the prepreg sheet and having a second hole communicating with the through-hole, and a conductive paste filling the though-hole, the first hole, and the second hole. The thickness t1 of the prepreg sheet, the minimum diameter rmin of the through-hole, the thickness tf1 of the first film, the diameter rf1 of the first hole, the thickness tf2 of the second film, the diameter rf2 of the second hole satisfy a relation: rf1/tf1≧3, rf2/tf2≧3, and rmin/(t1+tf1+tf2)≦̸1.5. This intermediate material provides a circuit board having a fine via-conductor connected to a metal foil securely and stably.
Abstract:
PROBLEM TO BE SOLVED: To provide an interposer including stress-engineered nonplanar microsprings which provides interconnection of bonding pads of electronic structures disposed above and below the interposer.SOLUTION: A lateral offset between an anchor portion of a microspring 5 disposed for contact at a bottom surface of an interposer 2 and a tip of the microspring 5 located in a free portion of the microspring 5 for contact and deflection over a top surface of the interposer 2 permits the interconnection of devices having different bonding pad pitches. Contacts of microsprings 5 at the free portion permit temporary interconnection of devices, while solder applied over the free portion permits permanent connection of devices to the interposer 2.