| 摘要 |
PROBLEM TO BE SOLVED: To improve the structure of a molded substrate in such a manner that an adhesive does not give adverse influences to the inner circumference face of a lamination type optical information recording medium having a molded substrate with a flat lamination face and that the adhesion region can be formed near the inner circumference end as close as possible. SOLUTION: On the premise that the molded substrate has a flat face having no trace of the pressing member of a stamper as the master pattern of the relief pattern in the die on the surface having a relief pattern for recording and reproducing of information. Further, an annular minute recess is formed in a little outer circumference part from the center hole of the relief pattern face of the molded substrate. An adhesive is applied in an annular state in the outer part of the recess and spread to form a uniform thin adhesive layer all over the outer region of the annular recess and then two molded substrates are adhered. The inner circumference edge of the adhesive layer is located near the center hole of the molded substrate and further spread inward in the radial direction in the adhesion process. However, the adhesive in inhibited from spreading by the annular recess and is certainly prevented from squeezing to the inner circumference face of the center hole. |
