Objective lens and optical pickup apparatus
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United States of America Patent
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Jun 30, 2009
Grant Date -
Oct 6, 2005
app pub date -
Mar 30, 2005
filing date -
Apr 2, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens containing a lens body made of a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7.
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