Pioneer Electronic Corporation

Kenji Koushiro

Osamu Kumasaka

Hirotoshi Tabuchi

Katsura Ito

A method for preparing a stamper comprises the steps of forming a first electro-conductive layer and a second electro-conductive layer on a photoresist layer carrying pits through a physical vapor deposition before the electroforming of a stamper layer. The second electro-conductive layer is effective for preventing the first electro-conductive layer from corroding during the electroforming step because of the active treatment solution for the electroforming and also avoids the corrosion of the first electro-conductive layer even in the storage period before the particular electroforming step.

Growing community of inventors

Yamanashi, Japan

Kenji Koushiro