| 摘要 |
PURPOSE:To ease the production effort and to reduce the fluctuation caused by temperature and wavelength fluctuations. CONSTITUTION:A luminous flux generated by a semiconductor laser 1 is reflected by a convex mirror 4, then reflected by a concave mirror 5 which is placed facing against the mirror 4 and then converged on the signal recording surface of a magneto-optical disk 101. The luminous flux reflected by the disk 101 is led to a photodetector 7 side by a hologram 3. |
