Patent ID: 6875489

Claim:
An optical recording medium which comprises a 0.3 to 2.0 mm-thick substrate made from a thermoplastic resin and having embossed pits or guide grooves, a reflection layer formed on the substrate and a 3 to 200 μm-thick transparent protective layer formed on the reflection layer and which reproduces recorded information based on a change in the intensity of reflected light by applying a light beam from the surface side of the transparent protective layer, wherein the substrate is formed from a thermoplastic resin which comprises at least 50 wt % of an aromatic polycarbonate resin obtained by polymerizing a dihydroxy compound containing at least one aromatic dihydroxy compound (component A) selected from the group consisting of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (component a-1) and 9,9-bis(4-hydroxy-3-methylphenyl)fluorene (component a-2) in an amount of at least 20 mol % based on the total of all the dihydroxy compounds as a bisphenol component.