Optical head with both a servo signal and a Rf signal detecting

Details Optical head with both a servo signal and a Rf signal detecting Optical head with both a servo signal and a Rf signal detecting

1998-06-02

2000-11-28

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369103, 369110, G11B 1110

Patent

active

061544345

ABSTRACT:
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.

REFERENCES:
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patent: 5488598 (1996-01-01), Endo et al.
patent: 5502708 (1996-03-01), Morimoto
patent: 5673241 (1997-09-01), Koyama et al.
patent: 5708644 (1998-01-01), Hasegawa
patent: 5790504 (1998-08-01), Hayashi et al.
patent: 5881043 (1999-03-01), Hasegawa et al.
patent: 5978344 (1999-11-01), Horinouchi et al.

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