| 发明名称 |
OPTICAL RECORDING MEDIUM, OPTICAL RECORDING AND REPRODUCING DEVICE, OPTICAL RECORDING DEVICE, OPTICAL REPRODUCING DEVICE, AND DATA RECORDING AND REPRODUCING METHOD, DATA RECORDING METHOD, AND DATA REPRODUCING METHOD ON OPTICAL RECORDING MEDIUM |
| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain satisfactory characteristics in data recording and data reproduction to a super resolution type optical recording medium. <P>SOLUTION: Recording and reproduction of data are performed by irradiating the optical recording medium 10, provided with a substrate 11, a light transmission layer 12, and a first dielectric layer 31, a noble metal oxide layer 23, a second dielectric layer 32, a light absorption layer 22, a third dielectric layer 33 and a reflection layer 21 which are disposed between the light transmission layer 12 and the substrate 11, with a laser beam 40 from the light transmission layer 12 side. When the wavelength of the laser beam 40 and a numerical aperture of an object lens are defined as λ and NA, respectively, λ/NA is set to be ≤640 nm. When recording power and reproducing power of the laser beam 40 are defined as Pw and Pr, respectively, Pw and Pr are set so as to satisfy Pw×0.1≤Pr≤Pw×0.5, so that recording of recording mark columns containing recording marks having lengths of ≤λ/4NA and reproduction from the recording mark columns are performed. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
