| 摘要 |
AN OPTICAL RECORDING MEDIUM ACCORDING TO THE PRESENT INVENTION INCLUDES A BASE LAYER HAVING AN INFORMATION SIGNAL PORTION FORMED ON A SURFACE ON THE SIDE ON WHICH LASER LIGHT IS INCIDENT, AND A LIGHT TRANSMISSIVE LAYER FORMED ON THE BASE LAYER. A THICKNESS T OF THE LIGHT TRANSMISSIVE LAYER IS WITHIN THE RANGE OF T = 3 TO 177 µM AT LEAST IN AN AREA OF THE INFORMATION SIGNAL PORTION. IF UNEVENNESS OF THE LIGHT TRANSMISSIVE LAYER IS ( )T, N.A. OF AN OPTICAL SYSTEM FOR REPRODUCTION OR RECORDING AND REPRODUCTION AND A WAVELENGTH (LAMBDA) SATISFIES ( )T < ± 5.26 ((LAMBDA)/N.A.4) (µM). A TRACK PITCH IS P AND A SKEW IS ( ), THEN P < 0.64 µM AND ( ) < ±84.115° ((LAMBDA)/N.A.3/T) ARE SATISFIED. THE OPTICAL RECORDING MEDIUM IS RECORDED OR REPRODUCED BY A RECORDING AND REPRODUCING SYSTEM SATISFYING (LAMBDA) < 0.68 µM AND N.A/(LAMBDA) > 1.20. THE OPTICAL RECORDING MEDIUM PERMITS A RECORDING CAPACITY OF 8 GB.
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