| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup device and an optical disk device which can maintain at minimum an offset which occurs for a signal used for tracking control irrespective of how an optical disk having two or more layers of information recording surfaces is used. <P>SOLUTION: An optical pickup device includes: a light source 1; a light receiving sensor 10 having main tracking photo-detecting faces and sub-tracking photo-detecting faces; and a hologram 7a having tracking areas that are divided into main tracking areas and sub-tracking areas along division lines in the tangential direction, and in the hologram 7a, each of the tracking areas is alternately divided into the main tracking areas and the sub-tracking areas along the division lines in the radial direction, and the same width is employed in the radial direction for the main tracking areas and the sub-tracking areas. <P>COPYRIGHT: (C)2007,JPO&INPIT |
