Pioneer Electronic Corporation

Pioneer Video Corporation

Junichi Watanabe

Haruhisa Maruyama

Shinichi Hanzawa

Yoshitaka Nonaka

Masahide Itoigawa

An optical disc has a pair of light-transmissible circular substrates each having an inner non-data region disposed around a center hole thereof, a data region disposed around the inter non-data region for bearing signals corresponding to information to be recorded and an outer non-data region disposed around the data region which are formed on a major surface of the substrate. The optical disc has a reflective layer formed on the data region and a protective layer made of an ultraviolet ray setting resin containing metal ions formed on the reflective layer. The optical disc has an adhesive layer made of an adhesive composition containing an ultraviolet ray setting component and an anaerobic hardening component disposed between the protective layers of the circular substrates for adhering the circular substrates.

Growing community of inventors

Yamanashi, Japan

Junichi Watanabe