FORMATION METHOD OF DEEP PIT REGION AND MANUFACTURING METHOD OF OPTICAL RECORDING MEDIUM USING SAME

摘要

PROBLEM TO BE SOLVED: To easily and economically form a deep pit when an optical recording medium is manufactured.

SOLUTION: The pit 1 is formed of a layered body 2 having at least one first layer 3 formed by using a physical state variable material and a second layer 4 formed by using the material which is the same as the first layer 3 and is in a physical state different from that of the first layer 3. One area of the first layer 3 is processed for changing the area from the initial physical state to the physical state corresponding to the physical state of the second layer 4. A selection etching step for removing the area of the first layer 3 and the area of the second layer 4 covered by the area of the first layer 3 is performed. The material is advantageously a phase transition material.

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