| 摘要 |
PURPOSE:To enable high-density and high-sensitivity recording at a high speed by optical writing with small-sized light wt. semiconductor laser, by providing a recording layer containing a diacetylene derivative compound and one or more of a compound represented by a specific formula. CONSTITUTION:A diacetylene derivative compound (DA compound) is one represented by formula R<7>-CidenticalC-CidenticalC-R<8> and a polymer thereof. A polymethylene compound represented by formula 1 or 2 has an absorption peak in a wavelength region of 750nm or more and generates heat with infrared rays having said wavelength. A recording layer 2 containing the DA compound 3 and the polymethylene compound 4 is formed on a substrate 1 and, if necessary, other layer, for example, a transparent protective layer can be also provided on the recording layer 2. The compounding ratio of the DA compound and the polymethylene compound in the recording layer 2 is pref. 1/15-15/1 and optimumly 1/5-10/1. The thickness of the recording layer 2 is pref. about 300Angstrom -2mum and especially pref. 1,000-5,000Angstrom . |
