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1. KR1020070108226 - OPTICAL PICKUP DEVICE AND, OBJECTIVE OPTICAL UNIT AND OBJECTIVE OPTICAL SYSTEM DESIGNING METHOD

Office Republic of Korea
Application Number 1020077020211
Application Date 04.09.2007
Publication Number 1020070108226
Publication Date 08.11.2007
Publication Kind A
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 5/18
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
18Diffracting gratings
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
CPC
G11B 7/1367
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 ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; 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
1365Separate or integrated refractive elements, e.g. wave plates
1367Stepped phase plates
G11B 7/1275
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 ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; Record carriers therefor;
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
125Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
127Lasers; Multiple laser arrays
1275Two or more lasers having different wavelengths
G11B 7/1353
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 ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; 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
1353Diffractive elements, e.g. holograms or gratings
G11B 7/1374
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 ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; 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
1372Lenses
1374Objective lenses
G11B 7/13922
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 ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; 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
1392Means for controlling the beam wavefront, e.g. for correction of aberration
13922passive
G11B2007/0006
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 ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; Record carriers therefor;
0003Recording, reproducing or erasing systems characterised by the structure or type of the carrier
0006adapted for scanning different types of carrier, e.g. CD & DVD
Applicants KONICA MINOLTA OPTO, INC.
코니카 미놀타 옵토 인코포레이티드
Inventors OTA KOHEI
오오따 고오헤이
HASHIMURA JUNJI
하시무라 쥰지
KIMURA TOHRU
기무라 도오루
IKENAKA KIYONO
이께나까 기요노
SAKAMOTO KATSUYA
사까모또 가쯔야
MORI NOBUYOSHI
모리 노부요시
NOMURA EIJI
노무라 에이지
Agents 장수길
성재동
Priority Data JP-P-2005-00064156 08.03.2005 JP
JP-P-2005-00262358 09.09.2005 JP
Title
(EN) OPTICAL PICKUP DEVICE AND, OBJECTIVE OPTICAL UNIT AND OBJECTIVE OPTICAL SYSTEM DESIGNING METHOD
(KO) 광픽업 장치 및, 대물 광학 유닛 및 대물 광학계의 설계방법
Abstract
(EN)
An optical pickup device comprising a first light source for outputting a first light beam, a second light source for outputting a second light beam, a third light source for outputting a third light beam, and an objective optical unit having an annular-structure first light path difference imparting structure and an annular-structure second light path difference imparting structure, wherein the magnifications of the objective optical unit when the first, second and third beams are incident to the objective optical unit are almost the same, the first light path difference imparting structure imparts a specified light path difference to the first light beam, and changes the spherical aberrations of all the first light beam, second light beam and third light beam to one of underand over directions, the second light path difference imparting structure imparts a specified light path difference to the first light beam, and changes the spherical aberration of only the second light beam out of the first light beam, second light beam and third light beam to the other direction different from the one of under and over directions. ©KIPO&WIPO 2008

(KO)
본 발명에 따른 광픽업 장치는, 제1 광속을 출사하는 제1 광원과, 제2 광속을 출사하는 제2 광원과, 제3 광속을 출사하는 제3 광원과, 고리띠 모양의 구조로 이루어지는 제1 광로차 부여 구조와 고리띠 모양의 구조로 이루어지는 제2 광로차 부여 구조를 가지는 대물 광학 유닛을 구비하고, 상기 제1 광속, 제2 광속 및 제3 광속이 상기 대물 광학 유닛으로 입사했을 때의 상기 대물 광학 유닛의 배율이 거의 동일하고, 상기 제1 광로차 부여 구조는 상기 제1 광속에 대해서 소정의 광로차를 부여함과 함께, 상기 제1 광속, 제2 광속, 제3 광속 전부에 대해서 구면 수차를 언더 또는 오버 중 어느 한쪽으로 변화시키고, 상기 제2 광로차 부여 구조는 상기 제1 광속에 대해서 소정의 광로차를 부여함과 함께, 상기 제1 광속, 제2 광속, 제3 광속 중 상기 제2 광속에 대해서만 구면 수차를 언더 또는 오버 중 상기 한쪽과는 상이한 다른 쪽으로 변화시킨다.