| 摘要 |
PROBLEM TO BE SOLVED: To obtain a recording layer adapted to ultra-high density recording capable of recording and reproducing with a laser beam selected from a specific wavelength range, by incorporating a compound represented by a specific formula in the layer in an optical recording medium having at least the recording layer and a reflecting layer on a base plate. SOLUTION: In a write once optical recording medium such as a CD-R or the like containing a compound capable of recording and reproducing with a blue laser beam, a compound represented by the formula is incorporated in a recording layer provided on a base plate, and the medium is recorded and reproduced with the beam selected from a range of 400 to 5,000 nm of a wavelength, wherein a substituent X is a halogen atom, hydroxyl group, cyano group or the like, L1 to L4 are each a hydrogen atom, halogen atom, hydroxyl group, substituted or unsubstitued alkyl group or the like, and Z is an oxygen atom, a sulfur atom or the like. As a material of the plate, a material which may be fundamentally transparent to a recording light and a reproducing light, and, for example, a polymer material such as an epoxy resin or the like or an inorganic material such as a glass or the like is used. |
