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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsEiji Ohno, Yoshitaka Sakaue, Kenichi Nagata, Nobuo Akahira, Masahide Yokoyama, Hiroshi Hayata, Noboru Yamada
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The present invention is to provide a method for manufacturing the PCE optical information recording disk under control of not only the crystallization velocity but also the complex index of refraction and thus the reflectance on the disk surface. The PCE optical information recording disk is suitable to be used under the constant angular velocity (the constant rotational numbers wherein the disk has a characteristic that the crystallization velocity is designed to become faster from inside area of the disk to outside area in the radical direction thereof under control of not only the crystallization velocity but also the complex index of refraction and thus the reflectance on the disk surface. In the case of mass production and high film formation to be required, the present invention provides an effective method for manufacturing the optical disk by means of sputtering from at least two targets at the same time in a manner that the crystallization velocity is increased in a radial direction from inside area to outside area in the disk.
An optical information recording disk comprising a recording film deposited on a substrate, said recording film consists essentially of a material which is reversibly phase changeable between an amorphous phase and a crystal phase upon irradiation with a laser beam,
An optical information recording disk comprising a recording film deposited on a substrate, said recording film consists essentially of a material which is reversibly phase changeable between an amorphous phase and a crystal phase upon irradiation with a laser beam,
An optical information recording disk comprising a recording film deposited on a substrate, said recording film consists essentially of a material which is reversibly phase changeable between an amorphous phase and a crystal phase upon irradiation with a laser beam,
Dependencies are inferred from the claim text.