Invention Grant
US07885167B2 Objective lens for optical pickup apparatus, objective lens unit for optical pickup apparatus and optical pickup apparatus using the same
有权
用于光学拾取装置的物镜，用于光学拾取装置的物镜单元和使用该物镜的光学拾取装置
- Patent Title: Objective lens for optical pickup apparatus, objective lens unit for optical pickup apparatus and optical pickup apparatus using the same
- Patent Title (中): 用于光学拾取装置的物镜，用于光学拾取装置的物镜单元和使用该物镜的光学拾取装置
-
Application No.: US11600444Application Date: 2006-11-16
-
Publication No.: US07885167B2Publication Date: 2011-02-08
- Inventor: Kentarou Nakamura , Eiji Nomura
- Applicant: Kentarou Nakamura , Eiji Nomura
- Applicant Address: JP Tokyo
- Assignee: Konica Minolta Opto, Inc.
- Current Assignee: Konica Minolta Opto, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Cohen Pontani Lieberman & Pavane LLP
- Priority: JP2005-343651 20051129
- Main IPC: G11B7/135
- IPC: G11B7/135
Abstract:
The present invention relates to an objective lens, an objective lens unit and an optical pickup apparatus. The objective lens is provided for an optical pickup apparatus recording or reproducing information by converging a light flux with a wavelength λ1 emitted from a light source onto an information recording surface of an optical information recording medium. The objective lens is formed of: a single lens having at least one aspheric surface. In the objective lens, an effective aperture, a thickness on an optical axis, a focal length, a numerical aperture, and a refractive index satisfy the predetermined conditional expressions. The objective lens unit is provided for an optical pickup apparatus and includes an aberration correcting element and the objective lens.
Public/Granted literature
Information query
IPC分类:
