Invention Grant
US08416670B2 Method of accessing optical recording media, optical pickup device, and optical drive using the device 失效
访问光学记录介质,光学拾取装置和使用该装置的光驱的方法

Method of accessing optical recording media, optical pickup device, and optical drive using the device
Abstract:
An optical pickup device corresponding to an optical recording medium having a plurality of recording layers, and an optical drive using the device are provided. The optical pickup device includes a collimator lens disposed between an object lens and a light source. The collimator lens adjusts a focal length with respect to the optical recording medium, and the object lens focuses light passing through the collimator lens, on the optical recording medium. The object lens is optically optimized for an upper or second-upper recording layer of the optical recording medium.
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