PURPOSE: To provide a rewritable optical information recording member having high stability and high crystallizing velocity by containing a thin recording film having a specific composition ratio of the specific elements.
CONSTITUTION: The relative ratio of Te, Se, Pd required for a thin recording film to exhibit stable properties in repeated recoding and erasing of a signal and have sufficient recording and erasing sensitivity, retentivity of recording signal and high C/N is Te=45W85at%, Se=5W45at% and Pd=5W40at%. When this is represented in triangular coordinates, it is an area surrounded by A, B, C, D. The coordinates (at%) of the points A, B, C, D are A(Te85, Se10, Au5), B(Te45, Se45, Au10), C(Te45, Se15, Au40), D(Te85, Se5, Au10). The Ge of the additives has an action of raising a transfer starting temperature for starting the crystallization of the amoprhous Te in the film, and the adding amount is approx. 2at%. When small amounts of the Sn, Sb, Bi, In are added, graphiting sensitivity is improved without decreasing whitening sensitivity, and the adding amount is preferably 5W30at%.
KIMURA KUNIO
SANAI SUSUMU
YAMADA NOBORU
