OPTICAL REGISTRATION MEDIA AND OPTICO REGISTRATION MEDIA REPRODUCTION PROCEDURE.

摘要

An optical recording medium, which includes a main information area (21) in which a film of the reflection of the metal (2) is formed in a substrate (1) where a row of bites is formed as main data, and area of the secondary information (22) in which the identification information of the medium (23) that is used to identify the optical recording medium is recorded individually by removing the reflection film from the metal (2) partially and forming a plurality of areas removed from reflection film; and in which the information is reproduced by irradiating the metal reflection film (2) with a beam of light, characterized in that the height of the track of the pitting row is formed in the substrate (1) in the area of the main information (21) is 24 μm or wider and 0.43 μm or narrower, and the shortest bite (11) of the row of bites which is formed in the substrate (1) in the area of the main information ( 21) is 0.12 μm or longer and 0.21 μm or shorter, and the material and thickness of the metal reflection sheet are selected so that when the information is reproduced with a beam of light having a wavelength of 405 nm and a lens objective with a numerical aperture of 0.85, a fluctuation value becomes 6.5% or less, and in the secondary information area (22), a row of bites or a groove is formed in the substrate (1 ) and the height of the track of the bite row or the groove is 0.24 μm or wider Y.