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1. WO2010032680 - OPTICAL PICKUP DEVICE

Publication Number WO/2010/032680
Publication Date 25.03.2010
International Application No. PCT/JP2009/065868
International Filing Date 10.09.2009
IPC
G11B 7/135 2012.1
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
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 7/1353
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 7/13922
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)
  • 遠藤 毅 ENDO Takeshi [JP]/[JP] (UsOnly)
  • 清水 佳恵 SHIMIZU Yoshie [JP]/[JP] (UsOnly)
  • 波多野 洋 HATANO Hiroshi [JP]/[JP] (UsOnly)
  • 森 伸芳 MORI Nobuyoshi [JP]/[JP] (UsOnly)
  • 野口 一能 NOGUCHI Kazutaka [JP]/[JP] (UsOnly)
  • 橋村 淳司 HASHIMURA Junji [JP]/[JP] (UsOnly)
Inventors
  • 遠藤 毅 ENDO Takeshi
  • 清水 佳恵 SHIMIZU Yoshie
  • 波多野 洋 HATANO Hiroshi
  • 森 伸芳 MORI Nobuyoshi
  • 野口 一能 NOGUCHI Kazutaka
  • 橋村 淳司 HASHIMURA Junji
Agents
  • 佐野 静夫 SANO Shizuo
Priority Data
2008-23759317.09.2008JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) OPTICAL PICKUP DEVICE
(FR) TÊTE OPTIQUE
(JA) 光ピックアップ装置
Abstract
(EN) Provided is an optical pickup device (1) which records or reproduces information onto/from a plurality of information recording layers at different distances from the surface of an optical disc.  The optical pickup device (1) includes: a light source unit (2) which emits a light flux of different wavelengths to different information recording layers; a wavefront conversion element (6) which wavefront-converts a light flux of at least one wavelength so that wavefronts are differentiated by the wavelength; and an objective lens (7) which converges the light flux obtained via the wavefront conversion element (6) onto a corresponding information recording layer.  Here, the wavefront conversion element (6) contains a volume phase type hologram optical element.
(FR) L'invention porte sur une tête optique (1) qui enregistre ou reproduit des informations sur/depuis une pluralité de couches d'enregistrement d'informations à différentes distances de la surface d'un disque optique. La tête optique (1) comprend : une unité de source de lumière (2) qui émet un flux lumineux de différentes longueurs d'onde vers différentes couches d'enregistrement d'informations ; un élément de conversion de front d'onde (6) qui convertit le front d'onde d'un flux lumineux d'au moins une longueur d'onde de telle sorte que les fronts d'onde sont différenciés par la longueur d'onde ; et une lentille de focalisation (7) qui fait converger le flux lumineux obtenu par l'intermédiaire de l'élément de conversion de front d'onde (6) sur une couche d'enregistrement d'informations correspondante. Ici, l'élément de conversion de front d'onde (6) contient un élément optique holographique de type à phase volumique.
(JA)  光ディスク表面からの距離が異なる複数の情報記録層に対して情報の記録または再生を行う光ピックアップ装置(1)は、異なる情報記録層に対応して異なる波長の光束を出射する光源部(2)と、少なくとも1つの波長の光束を、波長によって波面が互いに異なるように波面変換する波面変換素子(6)と、波面変換素子(6)を介して得られる光束を、対応する情報記録層に集光させる対物レンズ(7)とを備えている。このとき、波面変換素子(6)は、体積位相型のホログラム光学素子を含んで構成されている。
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