| 摘要 |
PURPOSE:To record data with a high density, to suppress the crosstalk and to exactly reproduce the data. CONSTITUTION:At the time of a recording mode, an optical device 64 is arranged between a collimator lens 63 and a beam splitter 65 and a two-dimensional super-high resolution beam is generated. A spot small in diameter is formed on a magneto-optical disk 67 by means of the super-high resolution beam and data are recorded with a high density. At the time of a reproducing mode, the optical device 64 is detached out of the optical path, a spot large in diameter is formed on the magneto-optical disk 67 by means of an ordinary light beam and the data are reproduced. Consequently, the crosstalk due to a side lobe when the super-high resolution beam is used, is prevented. |
