Optical recording medium, film thickness measuring method of the optical recording medium, film thickness control method and the production method

摘要

PPROBLEM TO BE SOLVED: To easily measure the film thickness of a translucent reflection layer by a transmission method, in an optical recording medium wherein an another layer such as a recording layer is provided between a substrate and the translucent reflection layer. PSOLUTION: In the optical recording medium provided with another layer (such as the recording layer 2) between the light transmissive substrate 1 and the translucent reflection layer 3, the region of the translucent reflection layer 3 is formed so as to be wider than the region of the another layer by prescribed regions WSB1/SB' and WSB2/SB' to measure the film thickness of the translucent reflection layer 3 by the transmission method in the prescribed regions WSB1/SB' and WSB2/SB'. PCOPYRIGHT: (C)2005,JPO&NCIPI