Pickup for magneto-optical recording medium

Details Pickup for magneto-optical recording medium Pickup for magneto-optical recording medium

2008-07-08

2008-07-08

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010, C369S112240

Reexamination Certificate

active

07397752

ABSTRACT:
A pickup for a magneto-optical recording medium is provided, which improves quality of reproduced signals by eliminating a phase difference between the polarizations and is capable of coping with magneto-optical recording media of different recording/reproducing systems. A return light beam of light reflected by a magneto-optical recording medium is polarized and separated into ± first-order diffracted lights through a light-branching diffraction element provided between a light source and an objective lens. The ± first-order diffracted lights are compensated for their phases through first and second phase compensation elements so that there is no phase difference between the polarizations, and are, further, polarized and separated through the first and second polarization/separation elements, and are received by first and second light detectors. Use of the first and second phase compensation elements having different phase compensation amounts makes it possible to cope with the magneto-optical recording media of different recording/reproducing systems.

REFERENCES:
patent: 5696750 (1997-12-01), Katayama
patent: 7180846 (2007-02-01), Kim et al.
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patent: 09-044922 (1997-02-01), None

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