Patent ID: 8685495

Claim:
A method for producing a multilayer information recording medium having â€œnâ€ information recording layers (wherein â€œnâ€ is an integer of two or more), the method comprising: applying an ultraviolet curable resin on a â€œkâ€th information recording layer (wherein â€œkâ€ is an integer of from 1 to (nâˆ’1)); bonding a signal transfer substrate having an inner periphery and an outer periphery and a signal-forming surface wherein a signal portion of concavo-convex shape is formed, to the ultraviolet curable resin applied on the â€œkâ€th information recording layer, with the signal-forming surface facing the ultraviolet curable resin; forming a resin layer by curing the ultraviolet curable resin by irradiating the ultraviolet curable resin with an ultraviolet ray which is applied from the signal transfer substrate side in a state where the signal transfer substrate is bonded to the ultraviolet curable resin; and peeling the signal transfer substrate from the resin layer by warping an inner periphery portion of the signal transfer substrate, wherein, as the signal transfer substrate, a substrate is used which is formed of an organic-inorganic hybrid material, the substrate having an inner periphery portion defining a center hole in the substrate and is provided with a reinforcement member that is concentric to the center hole defined by the inner periphery portion of the substrate and the reinforcement member having an inner periphery portion that either coincides with or overlaps the inner periphery portion of the substrate, the organic-inorganic hybrid material comprising an inorganic component of a molecular size having a polyhedral structure constituted by â€”Siâ€”Oâ€” bonds and an organic component cross-linking a plurality of the inorganic components; and the reinforcement member is formed of a material of which elastic modulus is larger than that of the organic-inorganic hybrid material.