| 摘要 |
<p>A photodetector (e.g. 5) is divided into a pair of first segments and a pair of second segments by a common line (7). A total area of the first segments is larger than an area of a spot (6) reflected from an optical disk onto the first segments. The second segments are provided within the first segments. A total area of the second segments is smaller than the spot. A detecting circuit (e.g. 10, 11, 12) is provided for producing a tracking error signal (TE) by removing a difference between outputs of the first segments and a difference between outputs of the second segments. <IMAGE></p> |
