Invention Grant
- Patent Title: Objective lens, optical pickup apparatus using the same, and method for manufacturing objective lens
- Patent Title (中): 物镜,使用其的光学拾取装置以及用于制造物镜的方法
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Application No.: US13360003Application Date: 2012-01-27
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Publication No.: US08488434B2Publication Date: 2013-07-16
- Inventor: Mitsuru Ito
- Applicant: Mitsuru Ito
- Applicant Address: JP Moriguchi-shi JP Tokyo
- Assignee: Sanyo Electric Co., Ltd,Sanyo Optec Design Co., Ltd
- Current Assignee: Sanyo Electric Co., Ltd,Sanyo Optec Design Co., Ltd
- Current Assignee Address: JP Moriguchi-shi JP Tokyo
- Agency: Morrison & Forester LLP
- Priority: JP2011-017835 20110131
- Main IPC: G11B7/135
- IPC: G11B7/135

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.
Public/Granted literature
- US20120195181A1 OBJECTIVE LENS, OPTICAL PICKUP APPARATUS USING THE SAME, AND METHOD FOR MANUFACTURING OBJECTIVE LENS Public/Granted day:2012-08-02
Information query
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