Method for laminating disc-shaped substrates

摘要

A high quality optical disc with extremely tiny bubbles or bubble less present in both disc-shaped substrates when they are laminated by means of an adhesive sheet (S) in a operation process. The method includes bonding the adhesive agent (S2) to the surface of the lower disc-shaped substrate (D1) placing the upper disc-shaped substrate (D2) on the adhesive applied to lower disc-shaped substrate (D1), pressurizing the upper disc-shaped substrate (D2) against the lower disc-shaped substrate (D1) by means of the pressing body (100), and exposing both the disk-shaped substrates to a highpressure atmosphere. In a next operation process in which both the disc-shaped substrates are left to the inside of a high pressure atmosphere, firstly pressing body (100) is permitted to press against the disc-shaped substrates to so enlarge or magnify the contact portion from the center side to the outside to render high-pressure atmospheric.