| 摘要 |
PURPOSE:To improve S/N of a data signal by rotating slightly the polarizing direction of the light projected to a photomagnetic disk from a light source toward the polarizing direction of the light going toward a servo sensor and therefore eliminating the interference between the data signal and the servo signal. CONSTITUTION:Laser light given from a laser light source 1 is projected to a photoelectric disk 6 through a half mirror 3, and this reflected light is rotated with its polarized surface by a Kerr revolving angle +thetak or -thetak according to the magnetizing direction of the disk 6. Then the reflected light is reflected by the mirror 3 and separated by a polarized beam splitter 13. Then the P polarized component is made incident on a data sensor 12 with the S polarized component projected to a servo sensor 10 respectively. In such a way, no interference occurs between the data and servo signals since both signals are separated from each other. Furthermore a large output is obtained for the servo signal. |
