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1. WO1999027532 - CATADIOPTRIC OPTICAL SYSTEM, OPTICAL PICKUP AND OPTICAL DISK DRIVE EMPLOYING THE SAME, AND OPTICAL DISK

Publication Number WO/1999/027532
Publication Date 03.06.1999
International Application No. PCT/KR1998/000371
International Filing Date 21.11.1998
IPC
G11B 7/085 2006.1
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
08Disposition or mounting of heads or light sources relatively to record carriers
085with provision for moving the light beam into, or out of, its operative position.
G11B 7/09 2006.1
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
08Disposition or mounting of heads or light sources relatively to record carriers
09with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
G11B 7/12 2006.1
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
G11B 7/135 2006.1
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
G11B 7/22 2006.1
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
22Apparatus or processes for the manufacture of optical heads, e.g. assembly
G11B 7/24 2006.1
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
24Record carriers characterised by shape, structure or physical properties, or by the selection of the material 
CPC
G11B 11/10547
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
10using recording by magnetic means ; or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
105using a beam of light or a magnetic field for recording ; by change of magnetisation; and a beam of light for reproducing, ; i.e. magneto-optical,; e.g. light-induced thermo-magnetic recording, ; spin magnetisation recording,; Kerr ; or Faraday; effect reproducing
10532Heads
10541for reproducing
10543using optical beam of radiation
10547interacting with the magnetisation of an intermediate transfer element, e.g. magnetic film, included in the head
G11B 11/10554
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
10using recording by magnetic means ; or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
105using a beam of light or a magnetic field for recording ; by change of magnetisation; and a beam of light for reproducing, ; i.e. magneto-optical,; e.g. light-induced thermo-magnetic recording, ; spin magnetisation recording,; Kerr ; or Faraday; effect reproducing
1055Disposition or mounting of transducers relative to record carriers
10552Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base
10554the transducers being disposed on the same side of the carrier
G11B 11/10569
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
10using recording by magnetic means ; or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
105using a beam of light or a magnetic field for recording ; by change of magnetisation; and a beam of light for reproducing, ; i.e. magneto-optical,; e.g. light-induced thermo-magnetic recording, ; spin magnetisation recording,; Kerr ; or Faraday; effect reproducing
1055Disposition or mounting of transducers relative to record carriers
10556with provision for moving or switching or masking the transducers in or out of their operative position
10567Mechanically moving the transducers
10569Swing arm positioners
G11B 11/1058
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
10using recording by magnetic means ; or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
105using a beam of light or a magnetic field for recording ; by change of magnetisation; and a beam of light for reproducing, ; i.e. magneto-optical,; e.g. light-induced thermo-magnetic recording, ; spin magnetisation recording,; Kerr ; or Faraday; effect reproducing
1055Disposition or mounting of transducers relative to record carriers
1058Flying heads
G11B 11/10584
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
10using recording by magnetic means ; or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
105using a beam of light or a magnetic field for recording ; by change of magnetisation; and a beam of light for reproducing, ; i.e. magneto-optical,; e.g. light-induced thermo-magnetic recording, ; spin magnetisation recording,; Kerr ; or Faraday; effect reproducing
10582Record carriers characterised by the selection of the material or by the structure or form
10584characterised by the form, e.g. comprising mechanical protection elements
G11B 2007/13725
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
13725Catadioptric lenses, i.e. having at least one internal reflective surface
Applicants
  • SAMSUNG ELECTRONICS CO., LTD. [KR]/[KR]
Inventors
  • LEE, Chul, Woo
  • CHUNG, Chong, Sam
  • LEE, Yong, Hoon
  • YEON, Cheol, Sung
  • SEO, Joong, Eon
  • CHEONG, Young, Min
  • SHIN, Dong-Ho
  • CHO, Kun, Ho
  • SEONG, Pyong, Yong
  • YOO, Jang, Hoon
Agents
  • JO, Eui, Je
Priority Data
1997/6214622.11.1997KR
1998/1987629.05.1998KR
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) CATADIOPTRIC OPTICAL SYSTEM, OPTICAL PICKUP AND OPTICAL DISK DRIVE EMPLOYING THE SAME, AND OPTICAL DISK
(FR) SYSTEME OPTIQUE CATADIOPTRE, CAPTEUR OPTIQUE ET UNITE DE DISQUE OPTIQUE UTILISANT CE SYSTEME, ET DISQUE OPTIQUE
Abstract
(EN) An optical focusing system which uses a light beam emitted from a light source, includes a refractive surface on one side of the optical focusing system and having a first radius of curvature, a first reflection surface on the above one side, surrounding the refractive surface and having a second radius of curvature being different from the first radius of curvature, a transparent beam focusing surface on the other side of the optical focusing system, and a second reflection surface on the above other side and surrounding the beam focusing surface. The refractive surface refracts an incident light beam, the second reflection surface reflects a light beam refracted by the refractive surface toward the first reflection surface, and the first reflection surface focuses a laser light beam reflected from the second reflection surface on the beam focusing surface as a focused beam spot. The optical focusing system can be used in an optical pickup. The optical pickup uses the optical focusing system to generate, from a light beam e.g. laser light emitted from a light source, a beam spot used for recording or readinginformation to a recording medium. The optical pickup uses a near field effect provided by an optical focusing system according to the present invention, to allow a superior density of recording or reading. Further, the optical focusing system according to the invention can use a light beam having a beam diameter smaller than that of the laser beam used for an existing optical focusing system for forming a near field. Thus, the optical pickup according to the invention can record or read information on an optical disk having a surface recording density of 10Gbit/inch2 or more. Even if an incident light beam inclination occurs due to movement of the disk or the optical pickup, information can be recorded on or read from a disk accurately. Also, the assembly of the optical focusing system and the adjustment of the assembled optical focusing system are easily performed.
(FR) L'invention concerne un système de focalisation optique qui utilise un faisceau lumineux émis par une source de lumière. Ce système comprend une surface de réfraction d'un côté du système de focalisation optique présentant un premier rayon de courbure. Il comporte également une première surface de réflexion sur le côté susmentionné, entourant la surface de réfraction, et présentant un deuxième rayon de courbure différent du premier rayon de courbure, une surface de focalisation de faisceaux transparente de l'autre côté du système de focalisation optique, et une deuxième surface de réflexion sur l'autre côté susmentionné et entourant la surface de focalisation de faisceaux. La surface de réfraction réfracte un faisceau lumineux incident. La deuxième surface de réflexion reflète un faisceau lumineux réfracté par la surface de réfraction vers la première surface de réflexion, et cette première surface de réflexion focalise un faisceau de lumière laser reflété à partir de la deuxième surface de réflexion sur la surface de focalisation de faisceaux, sous forme d'un faisceau ponctuel focalisé. Le système de focalisation optique peut être utilisé dans un capteur optique. Ce capteur optique utilise le système de focalisation optique pour générer, à partir d'un faisceau lumineux, par exemple, de la lumière laser, émis par une source de lumière, un faisceau ponctuel utilisé pour enregistrer ou lire les informations sur un support d'enregistrement. Le capteur optique utilise un effet de champ proche assuré par un système de focalisation optique selon la présente invention, pour permettre une densité supérieure d'enregistrement ou de lecture. En outre, le système de focalisation optique selon l'invention peut utiliser un faisceau lumineux présentant un diamètre de faisceau inférieur à celui du faisceau laser utilisé pour un système de focalisation optique existant pour former un champ proche. Ainsi, le capteur optique selon la présente invention peut enregistrer ou lire des informations sur un disque optique dont la densité d'enregistrement de surface est de 10Gbit/pouce2 ou plus. Même lorsqu'une inclinaison de faisceau lumineux incident se produit en raison du mouvement du disque ou du capteur optique, les informations peuvent être enregistrées ou lues à partir d'un disque avec précision. En outre, le système de focalisation optique peut être aisément assemblé et réglé.
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