| 摘要 |
An optical pickup for writing/reading a magneto-optical signal recorded in a magneto-optical recording medium is provided, which reduces the size, integrates the functions and improves the mounting efficiency of a magneto-optical signal detection mechanism. The optical pickup comprises a semiconductor laser, a hologram for transmitting and diffracting the light emitted from the semiconductor laser, a collimator lens for condensing the light emitted from the semiconductor laser, an objective lens for condensing the laser light on an optical recording medium, a composite device interposed between the collimator lens and the objective lens, and photo-detectors for detecting an optical signal. The composite device 10 includes a polarization beam splitter 11, a condensation device 12, a reflector and a polarizer/splitter 14 integrated with each other. A photo-detector for detecting a servo signal and a photo-detector for detecting a magneto-optical signal are fabricated on a single substrate.
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