Patent ID: 6830647
Filing Date: 2004-12-14
Classification: B29C,B29L,B32B

Abstract:
A method of laminating first and second disc-shaped substrates in order to form a disc product comprising the following steps;1) bonding an adhesive agent to a surface of the first disc-shaped substrate, 2) placing the second disc-shaped substrate on the adhesive applied to the first disc-shaped substrate, 3) pressing the first disc-shaped substrate against the second disc-shaped substrate by means of a pressing body by applying a first pressure level to join them and form a disc product, and 4) exposing both the disk-shaped substrates joined as a disc product to a high-pressure atmosphere at a second pressure level greater than said first pressure level, said method further comprising: holding the pressing body against the second disc-shaped substrate in such a manner that a contact portion may be magnify enlarged from the center to the periphery, said holding step being conducted while said first and second disc-shaped substrates are held within the high-pressure atmosphere.