Optical information recording disk and method for manufacturing

Chemistry: electrical and wave energy – Processes and products – Coating – forming or etching by sputtering

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20419215, 20419226, 20419227, 20429812, C23C 1434

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active

060335351

ABSTRACT:
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.

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patent: 5395735 (1995-03-01), Nagata et al.
Kay et al., "Controlled Sputtering Process," IBM Technical Dis. Bulletin, vol. 12, No. 9, p. 1358 (Feb. 1970).

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