| 摘要 |
PURPOSE:To enable good recording and reproducing in a wide rang of temperature by detecting an ambient temperature of a magneto-optical recording medium and adjusting the strength of a 1st bias magnetic field and/or a 2nd bias magnetic field based on this detection result. CONSTITUTION:The intensity of a light beam emitted from an optical head 12 is controlled at two steps by a control circuit 20 in accordance with recording information, and moreover the electrification amts. of a 1st electromagnet 14 and a 2nd electromagnet 16 are controlled respectively. And, an output of a temperature measuring sensor 18 is inputted to the control circuit 20. The strength of the 1st grade bias magnetic field and/or the strength of the 2nd grade bias magnetic field are adjusted by the control circuit 20 based on the detection result of the detecting means 18. By this method, the magneto-optical recording and reproducing device can be constituted with recording and reproducing characteristics deterioration which is little even against a temperature change and has overwritability in a large degree of freedom for selecting a magnetic layer material. |
