Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-10-08
1998-05-12
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369103, 369110, 369 4423, 369 4412, G11B 709
Patent
active
057516820
ABSTRACT:
An optical head for a magneto-optical disk drive, including a laser diode mounted on a stem, a first photodetector unit for detecting a magneto-optical signal, and a second photodetector unit for detecting a focusing error signal and a tracking error signal. The optical head further includes a cap mounted on the stem so as to surround the laser diode and the first and second photodetector units, a beam splitter unit mounted on the cap, and a hologram mounted on the cap. The beam splitter unit includes a polarization beam splitter, an optical rotating film for rotating a polarization plane of a part of a beam reflected on a magneto-optical disk by 45 degrees, and a Rochon prism. The hologram diffracts a part of the reflected beam from the magneto-optical disk toward the second photodetector unit.
REFERENCES:
patent: 5483509 (1996-01-01), Yang et al.
patent: 5579291 (1996-11-01), Matsumoto
patent: 5583843 (1996-12-01), Horinouchi
patent: 5619482 (1997-04-01), Tezuka et al.
patent: 5621714 (1997-04-01), Kobayashi et al.
Chu Kim-Kwok
Epps Georgia Y.
Fujitsu Limited
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