Abstract:
A process for manufacturing an original disc comprising a step for irradiating an inorganic resist layer formed on a substrate with a recording laser beam modulated by an information signal corresponding to the information signal of an information irregular pattern to be formed on an optical disc thus forming an exposure pattern corresponding to the information irregular pattern of the optical disc, and a step for developing the inorganic resist layer to form an irregular pattern corresponding to the information irregular pattern by the inorganic resist layer. In order to manufacture an original disc having an appropriate irregular pattern, the exposed part is irradiated with an evaluation laser beam in the exposure step following trial exposure of the non-recorded region of the resist layer. Recording signal characteristics of the resist layer is then evaluated from the reflected light and an optimal focus position of laser beam for subsequent recording is determined based on the evaluation results.
Abstract:
An optical recording medium can be manufactured at a low cost by using configuration and a manufacturing method corresponding to configuration of a reproduction-dedicated optical recording medium. Moreover, new information such as cryptography and marks can be additionally recorded on the optical recording medium, which can perform stable recording and has a preferable characteristic. The optical recording medium (S) includes an information layer (2) having a reflection film (3) where an information recording section is formed by a physical shape change in the thickness direction or the track width direction. The reflection film allows additional recording by thermal recording and is made from an Al alloy or a Cu alloy having electric resistance not smaller than 20 muohm.cm and not greater than 90 muohm.cm.
Abstract:
An optical recording medium for recording/reproducing information with a light having a wavelength of 600 nm or less. The medium has favorable recording/reproducing characteristics and comprises a substrate and a recording layer formed on the substrate and containing a recording material of a transition metal incomplete oxide. Information is recorded/reproduced on/from such an optical recording medium of such a structure with a light having a wavelength of 600 nm or less. An optical recording method for recording information at higher density.
Abstract:
A resist material and microfabrication method realizing high-resolution microfabrication without using any expensive projector such as of an electron beam or an ion beam. They realize further finer microfabrication by using a conventional exposure system. A resist layer containing an incomplete oxide of a transition metal such as W or Mo is selectively exposed and developed to pattern the resist layer into a predetermined shape. The incomplete oxide of a transition metal referred to here is a compound the oxygen content of which is decreased below the stoichiometric composition corresponding to the valence number that the transition metal can have, namely a compound which is an incomplete oxide of a transition metal the oxygen content of which is smaller than that of the stoichiometric composition corresponding to the valence number that the transition metal can have.