Objective lens, optical pickup apparatus using the same, and method for manufacturing objective lens
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United States of America Patent
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Jul 16, 2013
Grant Date -
Aug 2, 2012
app pub date -
Jan 27, 2012
filing date -
Jan 31, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is an objective lens manufactured well by using a mold and an optical pickup apparatus including the same. The objective lens of the present invention includes a first region that focuses laser beams of a BD, DVD, and CD standards, a second region that focuses the laser beams of the DVD and CD standards, and a third region that focuses the laser beams of the BD and the DVD standards are provided in this order from a center portion of the objective lens. A first annular zone step provided in the first region has a step amount larger than step amounts of annular zone steps provided in other regions.
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