| 摘要 |
PURPOSE:To take out high-grade magneto-optical recording signals with simple constitution. CONSTITUTION:A magneto-optical recording disk 1 is irradiated with the laser beams emitted from a laser diode 2 after the laser beam on the right side of the optical axis as a boundary is optically rotated by a prescribed angle by a dextrorotatory plate 5R of an optically rotary plate 5 and after the laser beam on the left side is optically rotated by a prescribed angle by a levorotatory plate 5L. The reflected light relating to the laser beam via the dextrorotatory plate 5R is made incident on the levorotatory plate 5L and is further optically rotated by the prescribed angle in a right direction. The reflected light relating to the laser beam via the levorotatory plate 5L is made incident on the dextrorotatory plate 5R and is further optically rotated by the prescribed angle in a left direction. This reflected light is bent in its optical path by as much as the prescribed component by a hologram film 4 and is transmitted through a polarization beam splitter 3. A first photocletector 7 for detecting servo signals is irradiated with this light. The reflected light is also reflected by the polarization beam splitter 3 and a second photodetector 8 for detecting the magneto- optical recording signals is irradiated with this light. |
