| 摘要 |
PURPOSE:To obtain a large output of reproduction, by providing an analyzer and a photodetector at both sides of a recording medium, and making use of both Kerr effect of reflected light and Faraday effect of transmitted light at a time to perform a magneto-optical reproduction. CONSTITUTION:The light sent from a laser light source 1 passes through a polarizer 2 and irradiated to a recording medium 4 after having its optical path bent by a half mirror 3. When the magnetization of the medium 4 is set upward, the polarized wave surface of the reflected light 6 turns by a Kerr revolving angle +thetaK to the polarized wave surface of the incident light 8. The light 7 transmitted through a substrate 5 turns by a Faraday revolving angle +thetaF. Then the light 6 passes through an optical detector 9 having its quenching direction turned by -thetaK and is detected by a photodetector 11. As the detector 10 has its quenching direction turned by -thetaF, no transmitted light 7 reaches a photodetector 12. Therefore, a reproduced signal having about doubled value of VR, where Vr is obtained when only the Faraday effect is used can be obtained by supplying outputs +VR and 0 which is applied with the photoelectric conversion by the detectors 11 and 12 to a differential amplifier 15. |
