| 摘要 |
PURPOSE:To realize recording and reproduction with high density by arranging an objective lens between the light reflecting plane of a rotary polygonal mirror and a magneto-optical recording medium, and enabling the magneto-optical recording medium to be scanned by a convergent spot. CONSTITUTION:A tape shape recording medium 1 is the one is which a magneto- optical recording material layer of Tb-Fe and Tb-Fe-Co, etc., is provided on a resin film with low rigidity and with heat resistance by vapor-deposition or sputtering, and a guide groove for tracking is formed, and it is wound on a supplying reel 13. Laser beams emitted from a fixed optical system A2 and a fixed optical system B3 arranged oppositely to the side of the tape shape recording medium 1 are reflected on the rotary polygonal mirror 6, and each of them is made incident on actuators 4 and 5 incorporating the objective lenses, respectively, and is converged on the recording medium 1, then, it is recorded or reproduced. The actuators 4 and 5 are supported by brackets extending from the fixed optical systems A and B, respectively, and perform a focusing or a tracking function by moving the objective lens. In such a way, it is possible to perform the recording with high density. |
