| 摘要 |
PURPOSE:To reduce crosstalk between tracks with simple constitution by allowing the laser luminous flux to pass through a pinhole which is provided in the front of a recorded information detector and has a diameter smaller then the incident luminous flux. CONSTITUTION:A separating means 11 which separates the laser light reflected and analyzed on a recording medium 5 into two is provided in the optical path of a reproducing optical system, and a tracking signal and a focus signal are detected by one optical path separated by the separating means 11, and a pinhole 12 whose diameter is smaller than a reproducing laser luminous flux is provided in the other track information detecting optical path. The laser light is just focused on a prescribed track by a focusing error signal and a tracking error signal, and the crosstalk signal existing i the end part of the laser luminous flux is cut off by the pinhole 12 to detect only the information signal in the center part. Thus, the crosstalk between tracks is reduced. |
