Hitachi, Ltd.

Nippon Columbia Co., Ltd.

Hisae Sasaki

Kenchi Ito

Yumiko Anzai

Tetsuya Nishida

Yoshito Tsunoda

Masahiko Takahashi

Kazuhiko Nakano

A multilayer optical information medium provided with structure in which first and second substrates respectively provided with two to four layers of planar information areas are respectively arranged outside wherein the thickness of the above-described first and second substrates is set in the range of 0.52 to 0.65 mm. The above-described planar information area consists of embossed pits provided, for example on the surface of respective substrates or on the surface of a layer formed by transparent material and a semi-reflective layer provided on the embossed pits. A planar information area arranged in the farthest position from respective substrates is provided with a reflective layer in place of the above-described semi-reflective layer. The planar information area arranged in the farthest position from respective substrates may be constituted by a recording layer and a reflective layer provided on the recording layer.

Multilayer optical information medium

Growing community of inventors

Tokyo, Japan

Hisae Sasaki