| 摘要 |
PURPOSE:To provide an optical recording medium which permits recording and reproduction with a semiconductor laser and has high sensitivity by forming a recording layer so as to have a layer consisting of a specific naphthoquinone dye dispersed in a thermoplastic resin. CONSTITUTION:The naphthoquinone dye expressed by the formula I (R, R' are auxochrome) has the absorption peak wavelength which changes from a visible light region to a near IR region according to the kind of the auxochromes in the positions 5, 8. The auxochromes are preferably an amino group or subst. amino group as R in the formula and a phenyl amino group or substd. phenyl amino group as R'. The dye of which R is the amino group exhibits excellent characteristics in that said dye is easy to synthesize and fast to light and the absorption characteristics thereof complies with the wavelength of a semiconductor laser. The absorption peak wavelength of near IR light when measured with a benzene as a solvent complies well with the wavelength of the semiconductor laser. |
