| 摘要 |
PROBLEM TO BE SOLVED: To perform access from an optical head by providing an optical disk drive and a multiplex data surface optical medium in an optical data storage device and providing the surfaces of plural substrate members separated by air gaps in the medium. SOLUTION: This medium 12 is provided with a substrate 50 and laser light beams enter the medium 12 from the substrate 50. The substrates 50, 56, 61, 68 and 74 are provided by an optical transmissive material such as glass and a high polymer material, etc., through respective outer diameter rims 52, 58, 64 and 70 and inner diameter rims 54, 60, 66 and 72. The substrate 50 transmits electromagnetic radiations, data surfaces are provided on the plural substrates 50, 56, 62, 68 and 74 and the respective data surfaces possess data recorded in an annular pattern. Then, a connection device is provided so as to mutually connect plural members so as to turn the plural data surfaces 50, 56, 62, 68 and 70 to be in separated relation. Thus, the access is performed from the optical head and the optical data storage medium of the multiplex laminated layers in which the respective data layers 50, 56, 62, 68 and 70 are highly transmissive is obtained. |
