| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical recording medium which makes high-density recording and reproducing of information possible and which has sufficient stability for continuously repeated reproduction of still images. SOLUTION: The optical recording medium has a mask layer 3 which changes the transmittance for light by the temperature change by irradiation of light on a transparent substrate 1 consisting of a light-transmitting resin on which minute pit lines, concentric guide grooves or spiral guide grooves are formed so that the effective spot diameter of the laser light is decreased by using the changes in the transmittance of the mask layer. In the medium, a permeation preventing layer 2 to prevent the material of he mask layer from permeating the transparent substrate is formed between the transparent substrate and the mask layer. Thus, high-density recording and reproducing of information is made possible and the medium has sufficient stability for continuously repeated reproducing of still images. |
