| 摘要 |
PURPOSE: To provide method and device for reproducing an optical disk performing high density land/groove recording without lowering manufacturing yield of the optical disk and a reproducing device by making an information reproducing beam spot a long circle or an ellipse having the major axis in the direction vertical to the track of the optical disk. CONSTITUTION: The optical pickup 3 having an objective lens making a pupil an elliptic shape as the method and device for reproducing the land/groove recording optical disk recording information on both of a land 1 and a groove 2. Then, the information reproducing beam spot 5 is made the elliptic shape having the major axis vertical to both tracks of the land track 1 and the groove track 2, and the ratio between the major axis and the minor axis is specified. Thus, the optical disk hardly be made be affected by the slope (tilt) of the optical disk, a thickness error of a substrate, the reflectance error of the substrate, the wave front aberration of the optical disk 3 and de-focus, etc., and manufacturing yield of the optical disk and the reproducing device are not reduced. |
