Optische Platte mit hoher Speicherdichte

摘要

An optical disk allows recording of information at high density and accurate reproduction of such high-density recorded information by means of a light beam. The optical disk (1) according to the invention has a shutter layer (17), formed directly or through an intermediate layer on a substrate (11), for tightening a light beam to be irradiated to read or write information, the shutter layer containing semiconductor fine particles.