An optical pickup apparatus that can adaptive for a plurality types of optical discs different in the layout condition such as a recording density, etc. and an optical recording/reproducing apparatus employing the optical pickup apparatus. In the optical pickup apparatus, first and second light sources...http://www.google.ca/patents/US6856587?utm_source=gb-gplus-sharePatent US6856587 - Optical pickup and optical recording/reproducing apparatus using the same
