Matsushita Electric Industrial Co., Ltd.

Kensuke Kuchiba

Yasuo Wakahata

Masaaki Sunohara

Masahiro Nagasawa

Tooru Tamura

Shunsuke Matsuda

Akio Itoh

Kunio Nishi

Hiroshi Abe

An optical disc comprises a resin disc substrate, a recording medium layer formed on the disc substrate, a high purity of transparent layer, and a transparent protective resin layer. The transparency of the transparent layer is larger than that of the transparent protective resin layer. A laser beam is focused on the recording medium layer through the transparent protective layer and the transparent layer. The transparent layer is a transparent adhesive layer or an air layer. The focused laser beam is not affected by foreign matter in the vicinity of the recording medium layer due to the high transparency of the transparent layer on the recording medium layer.

Optical disc and method of manufacturing

A voltage-dependent resistor (varistor) of the bulk type comprising a sintered body consisting essentially of, as a main constituent, ZnO and additives of various metal oxides and further containing an additive of at least one of Al.sub.2 O.sub.3, In.sub.2 O.sub.3 Ga.sub.2 O.sub.3 provide much improved characteristics, especially superior limiting voltage ratio, surge resistance and life of the varistor.

Zinc oxide voltage-nonlinear resistor

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Hirakata, Japan

Kensuke Kuchiba