Optical pickup apparatus and optical information recording and/or reproducing apparatus

摘要

The invention relates to an optical pickup apparatus being capable conducting information recording and/or reproducing to at least three different optical information recording medium. Light flux having wavelength of »1 is utilized for one of the three optical information recording mediums, and light flux having wavelength of »2 is utilized for other two optical information recording mediums. »1 and »2 is different from each other.