Optical pickup adjusting apparatus and adjusting method

摘要

Disclosed is an adjustment apparatus for adjusting an optical pickup capable of recording and/or reproducing plural optical discs of different sorts. The adjustment apparatus is an optical disc for adjustment ( 1 ) having a first signal recording layer ( 5 ) having a physical format in common with a CD and a second signal recording layer ( 7 ) having a physical format in common with a DVD. On the first and second signal recording layers, there are concentrically recorded EFM modulated data. The respective signal recording layers are provided with recording areas ( 8 ), ( 9 ) not overlapped with each other.