Disc bonding method and device therefor

A device for bonding together two disc substrates, each of which has a UV transmissive base consisting of a synthetic resin, by curing the bonding agent by flash irradiation of UV light,

• at least one of said disc substrates having a UV transmissive-visible light reflective information recording layer provided on the UV transmissive base,
• a bonding agent containing a UV curable composition coated between two said disc substrates, said UV curable composition comprising a radical polymerizable monomer,
• the information recording layer facing the opposing said disc substrate,
• said device comprising:
• a light emission device which includes a UV light source lamp and a flashing discharge mechanism which can carry out a single or repeating emission,
• a means for blocking infrared light in the light from the light source when carrying out flashing UV irradiation, and
• at least one UV transmissive disc holding member with a surface roughness of Rmax.ltoreq.1 .mu.m and a profile irregularity of 7 .lambda..

In combination, two disc substrates and a device for bonding together said two disc substrates by curing the bonding agent by an irradiation of UV flashes comprising:

• two disc substrates each of which has a UV transmissive base consisting of a synthetic resin,
• at least one said disc substrate having a UV transmissive-visible light reflective information recording layer provided on the UV transmissive base,
• a bonding agent containing a UV curable composition comprising a radical polymerizable monomer, coated between two said disc substrates,
• an information recording layer facing the opposing said disc substrates,
• a light emission device which includes a UV light source lamp and a flashing discharge mechanism which can carry out single or repeating emission,
• a means for blocking infrared light in the light from the light source when carrying out flashing UV irradiation;
• and
• at least one UV transmissive disc holding member with a surface roughness of Rmax.ltoreq.1 .mu.m and profile irregularity of 7 .lambda..