Magneto-optical recording/reproducing apparatus with optical pic

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

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369110, 369116, 369 4424, 369 4439, 369 4417, G11B 1110, G11B 700

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active

054673364

ABSTRACT:
An optical pickup device for an information recording and/or reproducing apparatus in which fluctuations in polarization film characteristics due to the variable incident angles of the light beam to the beam splitter may be reduced to prevent C/N characteristics from being lowered. The optical pickup device includes an objective lens 3 for converging a light beam L from a laser light source 1 to a magneto-optical disc 2, a beam splitter 8 arranged on a light path between the laser light source 1 and the objective lens 3 for guiding a return laser light beam Lr from the disc to outside of the light path, and a photodetector 4 for detecting the return light beam Lr guided by the beam splitter 8 to outside of the light path. The beam splitter 8 is arranged at a portion in the light path between the laser light source 1 and the objective lens 3 in which the light beam L from the laser light source 1 is a divergent light beam. The multi-layered dielectric film 12 of the beam splitter 8 has polarization film characteristics of reflecting 65% of S-polarized light components and 35% of the P-polarized light components of the light beam L and the return light beam Lr incident on the multi-layered dielectric film 12.

REFERENCES:
patent: 4973836 (1990-11-01), Matsuoka
patent: 5073879 (1991-12-01), Ando et al.
patent: 5151889 (1992-09-01), Saini et al.

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