Invention Grant
US08488434B2 Objective lens, optical pickup apparatus using the same, and method for manufacturing objective lens 失效
物镜,使用其的光学拾取装置以及用于制造物镜的方法

Objective lens, optical pickup apparatus using the same, and method for manufacturing objective lens
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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