Optical recording medium and cover sheet for optical recording media

摘要

Provided are a cover sheet for optical recording media comprising a transparent disk-shaped sheet having a central hole and a hardcoat layer formed thereon wherein the hardcoat layer has a linear crack groove in the circumferential direction in the area close to the outer circumferential edge thereof; and an optical recording medium comprising a disk-shaped substrate having a central hole and at least a recording layer, a transparent sheet, and a hardcoat layer formed in that order thereon wherein the hardcoat layer has a linear crack groove in the circumferential direction in the area close to the outer circumferential edge thereof.