| 摘要 |
PURPOSE:To prevent the peeling and deformation of adhesion and to improve durability by forming a projecting plane which is slightly higher than the front and rear surfaces in the outer peripheral part and inner peripheral part on the outside of the information recording area of either the front or rear surface of the disk. CONSTITUTION:The surface of the disk 1 opposite to the information recording area 1b is formed to the projecting plane higher than the opposite surface 1c corresponding to the area 1b. A light reflecting film consisting of aluminum is formed on the surface of the area 1b and an adhesive agent layer 3 is formed thereon. The disks 1, 1' are compression bonded and adhered. Since the outer peripheral part 1d and inner part 1e of the disks 1, 1' are the projecting planes, these planes receive the greater part of the compression bonding and the secure adhesion is executed. On the other hand, the information recording area is low and, therefore the pressure thereon is low and the damaging of the information, such as pits, is obviated. |
