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1. WO1999009552 - OPTICAL PICKUP APPARATUS, HOLDER AND METHOD OF PRODUCING OPTICAL PICKUP APPARATUS

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Publication Number WO/1999/009552
Publication Date 25.02.1999
International Application No. PCT/JP1998/003573
International Filing Date 11.08.1998
Chapter 2 Demand Filed 12.03.1999
IPC
G11B 7/14 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
14specially adapted to record on, or to reproduce from, more than one track simultaneously
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
CPC
G11B 2220/2545
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
2220Record carriers by type
20Disc-shaped record carriers
25characterised in that the disc is based on a specific recording technology
2537Optical discs
2545CDs
G11B 7/13
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
13Optical detectors therefor
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 7/1359
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
1359Single prisms
G11B 7/1362
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
1362Mirrors
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
Applicants
  • KABUSHIKI KAISHA KENWOOD [JP]/[JP] (AT, BE, CH, CN, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, KR, LU, MC, NL, PT, SE, SG)
  • MIYAZAWA, Hiroshi [JP]/[JP] (UsOnly)
  • TACHIZAWA, Hidemi [JP]/[JP] (UsOnly)
Inventors
  • MIYAZAWA, Hiroshi
  • TACHIZAWA, Hidemi
Agents
  • OKABE, Masao
Priority Data
9/23647519.08.1997JP
9/24348126.08.1997JP
9/27336822.09.1997JP
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) OPTICAL PICKUP APPARATUS, HOLDER AND METHOD OF PRODUCING OPTICAL PICKUP APPARATUS
(FR) CAPTEUR OPTIQUE, SON SUPPORT ET PROCEDE D'OBTENTION D'UN CAPTEUR OPTIQUE
front page image
Abstract
(EN) An optical pickup apparatus (10) for reading data from a plurality of tracks of an optical disc (34) at the same time by focussing spots (M,...) of each light beam on a plurality of tracks, passing the reflected light beams of spots (M,...) sequentially through an objective lens (30), a collimator lens (28), and a focus adjusting lens (50) in this order, and detecting the reflected light beams with photodiodes (52M,...) disposed along a photodiode light reception plane (68). In order to make each reflected light become incident upon each photodiode (52M,...), a case (72) and a bracket (78) are separated from a chassis (70), and support the focus adjusting lens (50) and the photodiodes (52M,...) respectively. The case (72) and bracket (78) are made so that they can be fixed to the chassis (70) at optional positions in a predetermined area along a direction of the optical axis (66). While the case (72) and bracket (78) are moved along the optical axis (66) direction, positions along the optical axis (66) where the reflected light beams are allowed to enter the photodiodes (52M,...) are searched and the case (72) and bracket (78) are fixed to the chassis (70) at the searched positions.
(FR) L'invention porte sur un capteur optique (10) de lecture de données sur plusieurs des pistes d'un disque optique (34) focalisant les spots (M, ...) des différents faisceaux sur plusieurs pistes, et faisant passer les faisceaux de lumière réfléchie des spots par un objectif (30, par un collimateur (28), et par une lentille de focalisation (50) dans cet ordre, puis détectant le faisceau réfléchi au moyen de photodiodes (52M,...) disposées le long d'un plan de réception de la lumière (68). Pour que chaque lumière réfléchie arrive sur chacune des photodiodes (52M,...), il est prévu un boîtier (72) et une bride (78) séparées du châssis (70) et servant respectivement de support à la lentille de focalisation (50) et aux photodiodes (52M,...). Le boîtier (72) et la bride (78) sont conçus pour pouvoir se fixer au châssis (70) en des positions optionnelles dans une zone prédéterminée le long de l'axe optique (66). Pendant le déplacement du boîtier (72) et de la bride (78) le long de l'axe optique (66), s'effectue une recherche des emplacements des positions situées le long de l'axe optique (66) où les faisceaux réfléchis peuvent atteindre les photodiodes (52M,...), et le boîtier (72) et la bride (78) sont fixés au châssis (70) aux points recherchés.
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