| 摘要 |
PURPOSE:To easily realize a magneto-optical recording optical head with few deterioration in an S/N even when a substrate with large double refraction is used, by providing a pin hole by which only light in the neighborhood of the center of a reflected light beam is received on an optical detector. CONSTITUTION:Emitting light from a semiconductor laser 1 forms a spot on a recording medium 6 formed on a substrate 5 through a collimator lens 2, two beam splitters 3, and a condenser lens 4. After reflected light from the recording medium 6 is separated by the beam splitter 3, and whose beam diameter is limited by a pin hole 7, a signal is detected by an optical detector 9 through an analyzer 8. The reflected light separated by the beam splitter 3 on the other side passes through a convergent lens 10, and a part of it is separated by the beam splitter 3, and is introduced to a track error detector 11, and another part of it is introduced to a focus error detector 13 through a knife edge 12.
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