METHOD FOR MANUFACTURING SUBSTRATE FOR OPTICAL DISK, MANUFACTURING APPARATUS THEREFOR AND SUBSTRATE FOR OPTICAL DISK

摘要

PURPOSE: A manufacturing method of a substrate for an optical disk is provided to solve the problem that the minute unevenness of a substrate surface increases the noise of an optical disk and subsequently deteriorates the recording/playing characteristics of the optical disk. CONSTITUTION: Organic material on a substrate having uneven patterns is modified by irradiating the substrate with UV(UltraViolet) rays. The substrate is made to have transmissivity of 50% or lower when a laser beam having 300nm or longer to 375nm or shorter wavelength is emitted. As a result, the obtained substrate has the flattened surface to solve the problem that the minute unevenness of the substrate surface increases the noise of an optical disk and subsequently deteriorates the recording/playing characteristics of the optical disk. In addition, the adhesive strength between the substrate and other layers provided on the substrate is improved.