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1. WO2006095583 - OPTICAL PICKUP DEVICE AND, OBJECTIVE OPTICAL UNIT AND OBJECTIVE OPTICAL SYSTEM DESIGNING METHOD

Publication Number WO/2006/095583
Publication Date 14.09.2006
International Application No. PCT/JP2006/303414
International Filing Date 24.02.2006
IPC
G11B 7/135 2006.01
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 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
18Diffracting gratings
G02B 13/18 2006.01
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 2007/0006
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
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 7/1367
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 7/1374
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
Applicants
  • コニカミノルタオプト株式会社 Konica Minolta Opto, Inc. [JP]/[JP] (AllExceptUS)
  • 大田 耕平 OTA, Kohei [JP]/[JP] (UsOnly)
  • 橋村 淳司 HASHIMURA, Junji [JP]/[JP] (UsOnly)
  • 木村 徹 KIMURA, Tohru [JP]/[JP] (UsOnly)
  • 池中 清乃 IKENAKA, Kiyono [JP]/[JP] (UsOnly)
  • 坂本 勝也 SAKAMOTO, Katsuya [JP]/[JP] (UsOnly)
  • 森 伸芳 MORI, Nobuyoshi [JP]/[JP] (UsOnly)
  • 野村 英司 NOMURA, Eiji [JP]/[JP] (UsOnly)
Inventors
  • 大田 耕平 OTA, Kohei
  • 橋村 淳司 HASHIMURA, Junji
  • 木村 徹 KIMURA, Tohru
  • 池中 清乃 IKENAKA, Kiyono
  • 坂本 勝也 SAKAMOTO, Katsuya
  • 森 伸芳 MORI, Nobuyoshi
  • 野村 英司 NOMURA, Eiji
Priority Data
2005-06415608.03.2005JP
2005-26235809.09.2005JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) OPTICAL PICKUP DEVICE AND, OBJECTIVE OPTICAL UNIT AND OBJECTIVE OPTICAL SYSTEM DESIGNING METHOD
(FR) LECTEUR OPTIQUE, UNITE OPTIQUE D’OBJECTIF ET PROCEDE DE CONCEPTION DE SYSTEME OPTIQUE D’OBJECTIF
(JA) 光ピックアップ装置及び、対物光学ユニット及び対物光学系の設計方法
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 under and 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.
(FR)
La présente invention concerne un lecteur optique comprenant une première source lumineuse pour émettre un premier faisceau lumineux, une deuxième source lumineuse pour émettre un deuxième faisceau lumineux, une troisième source lumineuse pour émettre un troisième faisceau lumineux et une unité optique d’objectif ayant une première structure annulaire d’impression d'écart de trajectoire de la lumière et une seconde structure annulaire d’impression d'écart de trajectoire de la lumière, dans lequel les amplifications de l’unité optique d’objectif sont quasiment identiques lorsque les premier, deuxième et troisième faisceaux lumineux sont incidents à son niveau. La première structure d’impression d'écart de trajectoire de la lumière imprime un écart de trajectoire donné au premier faisceau lumineux et modifie les aberrations sphériques des premier, deuxième et troisième faisceaux lumineux en une sous-direction ou sur-direction, la seconde structure imprime un écart de trajectoire donné au premier faisceau lumineux et ne modifie que l'aberration sphérique du deuxième faisceau lumineux issu du premier faisceau, les deuxième et troisième faisceaux lumineux se voyant imprimer la direction opposée à celle préalablement imprimée (à savoir sous-direction ou sur-direction).
(JA)
 本発明に係る光ピックアップ装置は、第1光束を出射する第1光源と、第2光束を出射する第2光源と、第3光束を出射する第3光源と、輪帯状の構造からなる第1光路差付与構造と輪帯状の構造からなる第2光路差付与構造とを有する対物光学ユニットとを備え、  前記第1光束、第2光束及び第3光束が前記対物光学ユニットへ入射した時の前記対物光学ユニットの倍率がほぼ同じであり、  前記第1光路差付与構造は前記第1光束に対して所定の光路差を付与するとともに、前記第1光束、第2光束、第3光束の全てに対して球面収差をアンダーもしくはオーバーのうちいずれか一方に変化させ、  前記第2光路差付与構造は前記第1光束に対して所定の光路差を付与するとともに、前記第1光束、第2光束、第3光束のうち前記第2光束に対してのみ球面収差をアンダーもしくはオーバーのうち前記一方とは違う他方に変化させる。
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