Loading patent…
AssigneesHitachi, Ltd., Hitachi Maxell, Ltd.
InventorsMotoyasu Terao, Makoto Miyamoto, Yasushi Miyauchi, Keikichi Ando, Yumiko Anzai, Junko Ushiyama, Reiji Tamura, Yoshihiro Ikari, Tamotsu Fuchioka
Estimating the term…
In an optical disk for high density recording, for preventing the deformation of recording tracks caused by stress which may develop between the substrate and the recording stacked film formed thereon, a stress-compensation layer having a metal element such as Ti or Cr as a main component is provided. The stress-compensation layer undergoes contraction (tensile stress) to compensate for compression stress which develops in the stacked film during cooling after the thermal expansion of the substrate surface that occurs at the end of film formation. The stress-compensation layer has a pillar-like structure which, starting from the lower face, reaches the upper face of the film.
An information storage medium which comprises a substrate and, stacked thereon in the following successive order, at least a first protective layer, a first interfacial layer, a recording layer, a second interfacial layer, a stress-compensation layer having a pillar-like structure and containing not less than 30 atomic % and not more than 85 atomic % of CR, and a reflecting layer.
A method of manufacturing an information storage medium which effects writing and reading by laser light, which method comprises forming a layer containing 60 atomic % or more of at least one metal element having an atomic number of not less than 22 and not more than 47 at an Ar flow rate of 120 sccm or more.
Dependencies are inferred from the claim text.