| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical information recording medium in which information can be recorded with laser light in the recording and reproducing wavelength region for a DVD-R and in 390 to 440 nm wavelength region and to provide a method for optical information recording and reproducing to record information in the medium at the above short wavelength and to reproduce the information recorded in the medium by using a conventional recording and reproducing system for a DVD-R. SOLUTION: The optical information recording medium has a recording layer containing a dye compound in which information can be recorded by irradiation of laser light on a board. The recording layer is formed in such a manner that it shows >=20% reflectance for laser light in the wavelength region from 390 to 440 nm and for laser light in the wavelength region from 620 to 690 nm and that the real part n and the absolute value k of the imaginary part of the complex refractive index satisfy n>=1.8 and 0.02<k<0.5, respectively. |
