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1. EP1858012 - OPTICAL PICKUP DEVICE AND, OBJECTIVE OPTICAL UNIT AND OBJECTIVE OPTICAL SYSTEM DESIGNING METHOD

Office European Patent Office
Application Number 06714553
Application Date 24.02.2006
Publication Number 1858012
Publication Date 21.11.2007
Publication Kind A4
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
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
Applicants KONICA MINOLTA OPTO INC
Inventors IKENAKA KIYONO
KIMURA TOHRU
NOMURA EIJI
MORI NOBUYOSHI
SAKAMOTO KATSUYA
HASHIMURA JUNJI
OTA KOHEI
Designated States
Priority Data 2005064156 08.03.2005 JP
2005262358 09.09.2005 JP
2006303414 24.02.2006 JP
Title
(DE) OPTISCHES ERFASSUNGSBAUELEMENT UND OPTISCHE OBJEKTIVEINHEIT UND VERFAHREN ZUM ENTWURF EINES OPTISCHEN OBJEKTIVSYSTEMS
(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
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).