G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/13 (2006.01) G11B 11/105 (2006.01)
Patent
CA 2110753
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 in a state of a divergent light beam. The multi-layered dielectric film 12 of the beam splitter 8 is of polarization film characteristics of deflecting 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.
Ando Nobuhiko
Fujiie Kazuhiko
Gowling Lafleur Henderson Llp
Sony Corporation
LandOfFree
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