Patent ID: 7353528

Claim:
An optical recording medium comprising: a disc substrate having formed a concavo-convex structure formed at least on one surface thereof; and a multi-layered film made by stacking at least a recording layer capable of recording information signals by irradiation of a laser beam and a record-assist layer adjacent to the recording layer on the surface of the disc substrate having the concavo-convex structure, wherein, d/4<a<3d is satisfied where d is the thickness of the recording layer and a is the thickness of the auxiliary recording layer, and in a portion of the disc substrate having the concavo-convex structure, width D g of a level difference of a portion nearer to the injection side of the laser beam and width D 1 of a level difference of a portion remoter from the injection side of the laser beam satisfy the ratio of 0.5≦D 1 /D g ≦2.0.