Patent ID: 6991148
Filing Date: 2006-01-31
Classification: H01L,H05K,Y10T

Abstract:
1. A process for manufacturing a multilayer flexible wiring board by using a first single-wiring layer board piece having a first patterned wiring layer and a first resin film in close contact with said first wiring layer and a second single-wiring layer board piece having a second patterned wiring layer and a plurality of bumps connected to said second wiring layer at the bottoms to laminate said first and second single-wiring layer board pieces into a multilayer flexible wiring board, said process comprising: bringing the top of each of said bumps into contact with said first resin film, applying ultrasonic wave to at least one of said first and second single-wiring layer board pieces under pressure, forcing into said first resin film in contact with said each bump by vibration force of said ultrasonic wave to form an opening, bringing said each bump into contact with said first wiring layer, continuing said application of ultrasonic wave to said each bump and said first wiring layer in contact condition, electrically and mechanically bonding said each bump and said bump contacting said first wiring layer by the vibration force of said ultrasonic wave, and wherein said each bump is ultrasonically vibrated in the direction along said first resin film.