Objective lens and optical pick-up device using the same
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United States of America Patent
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May 14, 2013
Grant Date -
Jul 19, 2012
app pub date -
Jan 17, 2012
filing date -
Jan 17, 2011
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Provided is an objective lens that allows securing of a long working distance for a laser beam with a long wavelength and has a predetermined thickness or larger, and an optical pickup apparatus including the objective lens. In an objective lens of the present invention, 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. An optical super resolution with the laser beam of the BD standard is achieved by preventing a portion of the laser beam of the BD standard transmitted through the second region from contributing to spot formation.
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