Optical pickup apparatus for a magneto-optical recording medium

Details Optical pickup apparatus for a magneto-optical recording medium Optical pickup apparatus for a magneto-optical recording medium

1994-07-27

1996-06-18

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369 4423, G11B 700

Patent

active

055285759

ABSTRACT:
An optical pickup apparatus for a magneto-optical recording medium on which a wobbling track is formed includes a light source, an objective lens and a polarization beam splitter. The light source emits a linearly polarized diverging light beam. The objective lens converges the light beam emitted by the light source onto a magneto-optical recording medium and converges light reflected from the magneto-optical recording medium. The polarization beam splitter is disposed in a divergent/convergent light path between the light source and the objective lens and separates the reflected light beam from the magneto-optical recording medium from the divergent/convergent light path. The light source is disposed so that the plane of polarization of the light beam emitted by the light source is normal to the track of the magneto-optical recording medium. The polarization beam splitter is disposed so that the plane which includes the component of the reflected light beam from the magneto-optical recording medium corresponding to the component of the light beam emitted by the light source which is on the optical axis and also includes the component of the light separated from the divergent/convergent light path which is said reflected light beam component separated from the divergent/convergent light path is normal to the track of the magneto-optical recording medium.

REFERENCES:
patent: 4721368 (1988-01-01), Deguchi et al.
patent: 4771414 (1988-09-01), Yoshimatsu
patent: 4858218 (1989-08-01), Takagi et al.
patent: 5004326 (1991-04-01), Sasaki
patent: 5097462 (1992-03-01), Fujita et al.
patent: 5124868 (1992-06-01), Matsubayashi et al.
patent: 5189655 (1993-02-01), Ogata et al.
patent: 5216562 (1993-06-01), Luecker et al.
patent: 5251198 (1993-10-01), Strickler

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