Patent ID: 8143529
Filing Date: 2012-03-27
Classification: H05K,Y10T

Abstract:
1. A method of making a multi-layer circuit board, comprising: forming continuous deformable pattern films, each being deformable and having a circuit pattern formed on a thermoplastic resin film; laminating a plurality of the continuous deformable pattern films, thereby forming a deformable laminated body; placing the laminated body between a pair of hot press plates together with a pressure-adjusting sheet and a buffer member, the pressure-adjusting sheet having thereon a projected portion so that the projected portion is located at a position where a number of laminated circuit patterns is less than a number of laminated circuit patterns at other positions; and pressing the laminated body between the pair of hot press plates, while heating the same, thereby forming an integral body of the multi-layer circuit board, wherein in pressing and heating the laminated body between the pair of hot press plates, the buffer member suppresses an imbalance of pressure applied to the laminated body from the pair of hot press plates and the pressure-adjusting sheet having the projected portion further improves uniformity of the pressure applied to the laminated body in such a way that: