Invention Grant
US08441900B2 Objective lens and optical pick-up device using the same 失效
物镜和使用其的光学拾取装置

Objective lens and optical pick-up device using the same
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.
Public/Granted literature
Information query
Patent Agency Ranking
0/0