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AssigneeTDK Corporation
InventorsHisaji Oyake, Yuuichi Kawaguchi, Hiroaki Takahata, Kouji Mishima, Hiroyasu Inoue, Tsuyoshi Komaki, Masaki Aoshima, Hironori Kakiuchi
Estimating the term…
An optical recording disk includes a support substrate, grooves and lands alternately formed on one major surface of the support substrate, an optical functioning layer formed on the one major surface of the support substrate on which the grooves and the lands are formed and including a recording layer and a light transmission layer formed on the optical functioning layer, the grooves and the lands being formed so that the depth Gd of each of the grooves is equal to or larger than 15 nm and equal to or smaller than 25 nm and the half width Gw is equal to or larger than 150 nm and is equal to or smaller than 230 nm, and the recording layer including a first recording film containing Si as a primary component and a second recording film containing Cu as a primary component. According to the thus constituted optical recording disk, it is possible to suppress jitter of a signal obtained by reading data within a predetermined range, thereby suppressing reading errors, and it is possible to maintain the level of a push-pull signal equal to or higher than a predetermined value, thereby enabling tracking control in a desired manner.
An optical recording disk comprising a support substrate, grooves and lands alternately formed on one major surface of the support substrate, an optical functioning layer formed on the one major surface of the support substrate on which the grooves and the lands are formed and including at least one recording layer and a light transmission layer formed on the optical functioning layer, the grooves and the lands being formed so that the depth Gd of each of the grooves is equal to or larger than 15 nm and equal to or smaller than 25 nm and the half width Gw is equal to or larger than 150 nm and is equal to or smaller than 230 nm, and the at least one recording layer containing an inorganic element.
An optical recording disk in accordance with claim 32, wherein the grooves and the lands are formed in such a manner that each is wobbled so that the amplitude thereof with respect to an imaginary center line thereof is equal to or larger than ±7 nm.
Dependencies are inferred from the claim text.