Optical pickup device and optical disc apparatus for recording and reproducing information on and from optical disc including plurality of recording layers
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United States of America Patent
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May 27, 2014
Grant Date -
Sep 5, 2013
app pub date -
Aug 29, 2012
filing date -
Mar 2, 2012
priority date (Note) -
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Abstract
Provided is an optical pickup device that suppresses a fluctuation of a tracking error signal caused by stray light when recording/reproducing information on/from an optical disc including a plurality of recording layers and attains size reduction. It includes a laser diode emitting laser light of about 405 nm in wavelength, an objective lens irradiating the optical disc with an optical beam emitted from the laser diode and having a numerical aperture of about 0.85, and a detector including a detection part receiving the optical beam reflected from the optical disc. An optical magnification from the optical disc to the detector is set within a range from about 10× to 15×.
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