| 摘要 |
According to a method and apparatus for detecting a tracking error signal for an optical disk of this invention, the tracking error signal is detected from a differential output of a pair of first photosensors arranged in areas in which a 0th-order component and +/-1st-order components of a reflected beam incident on a track groove of a grooved optical disk are superposed. An offset signal of the tracking error signal is detected on the basis of outputs from a pair of second photosensors arranged between the first photosensors at a center of an area, of the 0th-order component, in which the 0th-order component is not superposed on the +/-1st-order components, and the first and second photosensors are aligned in a tracking servo direction. The first and second photosensors are controlled to move on the basis of the detected offset signal.
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