| 摘要 |
PURPOSE:To make a reflecting layer hard to bring about scratches and abrasion by forming a reflecting layer comprising pigment and a polymer material on a transparent substrate in which the irregularities corresponding to an information signal are formed and containing nitrocellulose as the polymer material. CONSTITUTION:A pigment containing layer 3 comprising at least a pigment material and a polymer material is formed as a reflecting layer on a substrate 2 in which a recessed pit part 4 and a projecting land part 5 corresponding to an information signal, a guide groove and an address code pit are formed. In this optical information medium reading light beams LB radiated from the substrate 1 side are respectively reflected by the boundary surface 8 between the substrate 1 and the pigment containing layer 3 and by the boundary surface 7 between the pigment containing layer and air, and signal reproduction is performed by utilizing multiple interference. Therefore, the reproduction of a signal is performed by utilizing that the light beams are reflected by the boundary surface 7 between the pigment containing layer and air to cause multiple interference. When the faults of shape such as scratches and abrasion are brought about, the multiple interference of light falls into disorder and the signal reproduction is hindered, and however, nitrocellulose is used for the pigment layer 3 as a polymer material, thereby improving the characteristic of scratch resistance. |
