| 摘要 |
PURPOSE:To obviate unequal adhesion and to prevent the generation of stresses by the unequal adhesion by providing an annular nonadhered part on the circumference of the central hole in the recording medium formed by sticking two sheets of optical disks to each other via an adhesive layer. CONSTITUTION:The optical information recording medium is formed by sticking two sheets of the optical disks 1, the recording films or reflecting films 2 of which are disposed on the inner side, via the adhesive layer 3 to each other and installing a center hub 4 to the central part on the outside surface of the optical disk 1. The annular nonadhered part 36 is provided around the sensor hole 7 to regulate the adhering range to a specified range. The unequal adhesion is eliminated in this way and the deterioration of appearance and the generation of the stresses occurring in the unequal adhesion are prevented. |
