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Abstract

An information recording apparatus includes a record signal processor for converting information to be recorded into an analog signal having three levels or more, a laser beam source for emitting a laser beam whose power is modulated at multiple levels in accordance with the three levels or more of the processed signal, and an optical system for focusing/radiating the laser beam on an information recording medium. The information recording medium has a recording layer. The laser beam whose power is modulated at the multiple levels is radiated on the recording layer. As a result, a plurality of phases having different crystallinities are obtained in a radiated portion in accordance with the laser power, and hence multi-level information is recorded in the data recording medium. The recorded information can be reproduced by detecting optical characteristics in these phases.

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First Claim