Method for bonding members, and disc manufacturing method and device

A method for manufacturing discs by bonding two disc substrates using a cationic polymerization type ultraviolet curable composition as an adhesive to produce a disc, comprising the steps of:

• applying said cationic polymerization type ultraviolet curable composition onto a part of an adhering surface of one of said two disc substrates;
• radiating ultraviolet light onto said cationic polymerization type ultraviolet curable composition;
• bonding said disc substrate to the other disc substrate via said cationic polymerization type ultraviolet curable composition which has been irradiated by the ultraviolet light;
• and
• spreading said cationic polymerization type ultraviolet curable composition which is present between said two disc substrates.

A disc manufacturing device which produces discs by bonding two disc substrates using a cationic polymerization type ultraviolet curable composition as an adhesive, comprising:

• an application device which applies said cationic polymerization type ultraviolet curable composition onto a part of an adhering surface of one of said two disc substrates;
• an ultraviolet light radiation device which radiates ultraviolet light onto said cationic polymerization type ultraviolet curable composition;
• an adhering device which adheres said disc substrate to the other disc substrate via said cationic polymerization type ultraviolet curable composition which has been irradiated by the ultraviolet light;
• and
• a spreading device which spreads said cationic polymerization type ultraviolet curable composition which is present between said two disc substrates.