Objective lens and optical information recording/reproducing apparatus having the same
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United States of America Patent
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Apr 19, 2011
Grant Date -
Jan 28, 2010
app pub date -
Jul 23, 2009
filing date -
Jul 24, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An objective lens used for an optical information recording/reproducing apparatus for an optical disc based on a predetermined standard is made of resin and has a numerical aperture larger than or equal to 0.75. When f (unit: mm) represents a focal length at a wavelength .lamda. (unit: nm), d (unit: mm) represents a thickness, and n represents a refractive index of the objective lens at the wavelength .lamda., the objective lens satisfies following conditions: 1.00
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