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1. CN101133450 - Optical pickup device and, objective optical unit and objective optical system designing method

Office China
Application Number 200680007108.7
Application Date 24.02.2006
Publication Number 101133450
Publication Date 27.02.2008
Grant Number 100565678
Grant Date 02.12.2009
Publication Kind C
IPC
G11B 7/135
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
G02B 13/18
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
18with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
G02B 5/18
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
18Diffracting gratings
Applicants Konica Minolta Opto Inc.
柯尼卡美能达精密光学株式会社
Inventors Ota Kohei
大田耕平
Hashimura Junji
森伸芳
Kimura Tohru
桥村淳司
Ikenaka Kiyono
木村彻
Sakamoto Katsuya
池中清乃
Mori Nobuyoshi
坂本胜也
Nomura Eiji
野村英司
Agents xuhai lan
中国国际贸易促进委员会专利商标事务所
Priority Data 064156/2005 08.03.2005 JP
262358/2005 09.09.2005 JP
Title
(EN) Optical pickup device and, objective optical unit and objective optical system designing method
(ZH) 光学拾取装置、物镜光学单元以及物镜光学系统的设计方法
Abstract
(EN)
An optical pickup apparatus includes: a first light source for emitting a first light flux; a second light source for emitting a second light flux; a third light source for emitting a third light flux; and an objective optical unit having a first optical path difference providing structure and a second optical path difference providing structure. Magnifications of the objective optical unit for the first-third light fluxes have almost same value. The first optical path difference providing structure provides a predefined optical path difference and changes a spherical aberration to be one of under-correction and over-correction for all of the first light flux, the second light flux, and the third light flux. The second optical path difference providing structure provides a predefined optical path difference and changes a spherical aberration to be the other of under-correction and over-correction of the spherical aberration only for the second light flux.

(ZH)

一种光学拾取装置,包括:第一光源,用以发出第一光束;第二光源,用以发出第二光束;第三光源,用以发出第三光束,以及物镜光学单元,具有环状的第一光学路径差提供结构和环状的第二光学路径差提供结构。上述第一光束、第二光束以及第三光束向上述物镜光学单元入射时,上述物镜光学单元的倍率几乎相同。第一光学路径差提供结构对上述第一光束提供预定光学路径差,并且对于所有第一光束、第二光束、和第三光束、将球面象差变为的不足和过度的任一方。第二光学路径差提供结构对上述第1光束提供预定光学路径差,并且在上述第一光束、第二光束和第三光束中、仅对第二光束、将球面象差变为不足和过度中的其中另一方。