Mitsui Minings & Melting Co., Ltd.

Suzuki Co., Ltd.

Motonobu Takahashi

Hideto Tanaka

Masahito Ishii

Akira Ichiryu

Toshiyuki Nakamura

Daisuke Arai

A process for producing a printed wiring board-forming sheet comprising a resin sheet having a through hole in the thickness direction and a metal chip inserted in the through hole. The sheet is produced by placing a resin sheet and conductive metal sheet in this order on a die base having a die hole, performing punching from the conductive metal sheet side to form a punched hole in the conductive metal sheet and to form a punched hole in the resin sheet and inserting the punched conductive metal chip in the through hole of the resin sheet whereby the front and back surfaces of the sheet can be electrically connected to each other. If the conductive metal chip is so inserted that its tip protrudes from the surface of the sheet, and if a large number of such substrates are laminated, electrical connection in the thickness direction can readily be made by virtue of the protruded conductive metal chips and a multi-layer board can be readily produced.

Growing community of inventors

Ageo, Japan

Motonobu Takahashi