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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiroaki Irie, Keiichiro Horai, Kenichi Nishiuchi, Yoshihisa Fukushima, Mitsuaki Oshima
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A main information area 31 capable of recording an information signal and a subsidiary information area 32 for recording subsidiary information that is different from the information signal are divided in one principal plane direction of a substrate, and an information layer for recording the information signal in the main information area 31 is provided also in the subsidiary information area 32, and medium identification information for distinguishing the medium optically is recorded in the information layer of the subsidiary information area 32 without changing the shape of the information layer. As a result, the medium identification information can be recorded in an optical recording medium 1 stably. In particular, the initialization of a phase change type optical recording medium and the recording of the medium identification information can be performed at the same time, so that the production process can be simplified, and the production costs can be reduced.
A recording method for an optical recording medium, for recording medium identification information for optically distinguishing the medium by using an optical recording medium provided with a main information area capable of recording an information signal and a subsidiary information area for recording subsidiary information that is different from the information signal, which are divided in a radial direction of a disc-shaped substrate, wherein an information layer for recording the information signal in the main information is provided also in the subsidiary information area, and by emitting a light beam to form a light spot to the information layer of the subsidiary information area,
An optical recording medium provided with a main information area capable of recording an information signal and a subsidiary information area for recording subsidiary information that is different from the information signal, which are divided in a radial direction of a disc-shaped substrate, wherein
Dependencies are inferred from the claim text.