Invention Grant
- Patent Title: Objective lens and optical pick-up device using the same
- Patent Title (中): 物镜和使用其的光学拾取装置
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Application No.: US13351707Application Date: 2012-01-17
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Publication No.: US08441900B2Publication Date: 2013-05-14
- 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 & Foerster LLP
- Priority: JP2011-006664 20110117
- Main IPC: G11B7/00
- IPC: G11B7/00

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
- US20120182847A1 OBJECTIVE LENS AND OPTICAL PICK-UP DEVICE USING THE SAME Public/Granted day:2012-07-19
Information query
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