METHOD FOR INSPECTING OPTICAL RECORDING MEDIUM

摘要

A method for inspecting an optical recording medium comprising a supporting substrate, a light transmitting layer, and an information layer interposed between them, and recording/reproducing data by irradiating the information layer with a laser beam through the light transmitting layer. The inspection method comprises a step for calculating the high-region level-of-unevenness and/or level-of-unevenness acceleration of a laser beam-incident plane, and a step for judging whether the medium is faulty based on the high-region level-of-unevenness and/or level-of-unevenness acceleration. According to the method, such an optical recording medium as irregularities existing on the light incident plane have serious effect on the recording/reproduction can be removed readily and surely. The invention is very suitable for inspecting a next-generation optical recording medium where irregularities existing on the light incident plane have serious effect on the recording/reproduction.