Optical element and an optical head apparatus using the same, and an optical information apparatus using the optical head device , as well as a computer with the optical information apparatus , an optical disc player , a car navigation system , an optical disc recorder and an optical disc server .

摘要

Providing an objective lens with a large numerical aperture (NA), the present invention records or plays conventional optical disks such as CDs and DVDs using an optical head capable of recording or reproducing high-density optical disks. An optical element (8) is provided between a first and second laser light source and an objective lens (18) for the purpose of converting a wave front of a second optical beam 32. Furthermore, the optical element (8) and the objective lens (18) are fixed to move as a single piece.