An optical waveguide is formed on a substrate and includes a curved ridge structure, a curved optical path, and a buffer layer. The method includes recording additional data in a data file separate from a file containing main data and recording navigation information that links the main data and the additional data. An outflow angle regulator is set correspondingly to the swaying portion. The position of the sliding jaw is limited by the operating levers, and its travel toward and away from the fixed jaw is defined by the operating levers.