| 摘要 |
PURPOSE:To attain ease of reproduction of information by scanning a laser light while vibrating the light in the direction orthogonal to the scanning direction. CONSTITUTION:The laser light from a laser light source 1 and a photomagnetic recording medium 5 are moved relatively and linearly to record the data and the recording width is expanded by vibrating mechanically a fixed mirror 3 or the like. In reproducing the laser light while vibrating the light, the laser light scans on a pit 13 and at the outside of the pit of the photomagnetic medium 5 along a scanning line 14. In eliminating a signal twice the mirror vibrating number from an output signal by means of a filter, a signal shown in the figure is obtained. Even if the pit has a minute defect, when the width of defect is narrower than the pit width, the reproduction is made possible. The detection of a recording track and the tracking of the reproducing head to the recording track are attained easily and sure reproduction is attained even with variation in the manufacture of recording media. |
