PURPOSE: To provide an information constituting medium free from warping or deformation of a base, by a method wherein an exposed surface of a plastic base provided with an information constituting layer is covered by a mixed film of a metallic compound and a metal.
CONSTITUTION: The information constituting layer 8 is provided on the plastic base 1, and the back side 3 of the base 1 or both the constituting layer 8 and the back side of the base 1 are covered by the mixed film 9 of a metallic compound (preferably, an oxide, fluoride or nitride of a metal such as Be, B, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Sr, Y, Zr, Nb, Tc, Ru, Rh, Pd, Ag, In, Sn, Sb or Ba) and a metal (preferably, Ba, Al, Si, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Y, Zr, Nb or Te) to obtain the objective medium.
HAYASHI TAKAHIRO
MORI KOUICHI
