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Abstract

In an optical disk which includes a recording film having a laminated construction, and which records information by changing optical characteristics of the recording film by applying a laser beam, there are laminatedly formed a WO3 film 2 as a second layer, the WO3 requiring energy by about 470 kJ when it dissociates 1 mol of oxygen molecules, an Sn—43 atomic % Bi film 3 which includes Sn as a first layer, the Sn generating energy by about 610 kJ when it bonds with 1 mol of oxygen molecules and having a melting point of about 139° C., and a resin film 4 in this order on a guide groove 1c forming surface 1b of a substrate 1. When a recording laser beam is applied, a part of Sn—43 atomic % Bi film 3 is turned into a liquid phase, both of the films 2 and 3 react, and the optical characteristics of the recording film 10 vary so that information is recorded. As a result, the retention characteristic of the recorded data is secured, and the reactivity of the recording film is enhanced.

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