To provide an optical disk device having reproducing signal characteristics for reducing the DC offset of a reproducing signal generated during the reproduction of a multilayer disk.
The optical disk device used for reproducing an optical disk having a plurality of information recording layers is provided with a laser light source (201) for applying a laser beam to an optical disk (205), a condenser lens (203) for condensing a laser beam reflected on the optical disk, main light receiving areas (106a and 106b) irradiated with the laser beams condensed by the condenser lens, auxiliary light receiving areas (106c and 106d) arranged adjacently to the main light receiving areas, and a signal processing part (11) for outputting a difference between the output of the main and auxiliary light receiving areas as a reproducing signal representing information recorded in an information recording layer.
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto