Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-02-08
1996-06-04
Nguyen, Viet Q.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369110, 369 4439, 369118, 369109, 369106, 369 4423, 369 4424, G11B 1100, G11B 709
Patent
active
055239943
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.
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Ando Nobuhiko
Fujiie Kazuhiko
Nguyen Viet Q.
Shaw, Jr. Philip M.
Sony Corporation
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