| 摘要 |
An optical pickup device for resolving problems with deterioration in the RF signal due to crosstalk from the preformatted structures in optical disks which provide address information, especially the Land Pre-Pit signal in optical disks such as DVD-R and DVD-RW disks with a LPP (Land Pre-Pit) structure. When the ratio of electric amplitude (Etan/Erad) of the incident light onto the disk, where Etan and Erad shows the electric amplitude of the foregoing light in the tangential and radial direction of the disk, is set to gamma then the optical pickup device is set so that 0.7<gamma (electrical amplitude ratio)<0.8.
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