| 摘要 |
PROBLEM TO BE SOLVED: To exponentially increase capacity of an optical disk by subdividing a reflection light intensity from a bit recorded with information. SOLUTION: The section of the disk 1 is constituted of a reflection layer 2 made of a metallic foil, etc., a photosensitive dyestuff layer 3 and a protection film 4, and has the structure as a sandwich held between transparent resin layers 5 forming the disk 1. When the information is written in, light of a proper wavelength is emitted to this photosensitive dyestuff layer 3 like at a CD-R forming time, and when a dyestuff is reacted optically to be cut, different reflectances occur between bits, and since they are read as the information, various reflectances are formed at the time of cutting. When the dyestuffs of two kinds or above are used, the dyestuff is mixed into a layer of dyestuff layer, or it is made a multilayer structure. A relative light absorption rate 100 layer 3a, a relative light absorption rate 67 layer 3b, a relative light absorption rate 33 layer 3c and a relative light absorption rate 0 layer 3d are made. |
