| 摘要 |
PURPOSE:To improve long-term preservable stability, to obviate deterioration in characteristics even at and under a high temp. and high humidity, and to increase a contrast ratio by laminating plural thin chemically vapor-grown films on a base in superlattice structure in such a manner that said films have an eutectic point with adjacent layers. CONSTITUTION:The thin chemically vapor-grown film layers 2 laminated on the base 1 form the superlattice structure laminated alternately with 4 layers of Zm films 21 and Ge films 22 which are grown films of metals, nonmetals or alloys. A part 30 of the laminate 2 provides a region 2' where the superlattice structure is annihilated when a light beam 3 is projected to this part. Said region can be utilize as an optical information bit, since the optical characteristics in this part are different. The region 2' is deformed to form a recess or hole part when the energy of the light beam is increased. This part acts as an optical information bit. The optical recording medium which has the excellent long-term preservable stability, decreases the deterioration in the characteristics even at and under a high temp. and high humidity and has the large contrast ratio at the time of recording is thus obtd. |
