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1. WO2009050940 - 抽出光学系およびそれを備える光ヘッド装置

公開番号 WO/2009/050940
公開日 23.04.2009
国際出願番号 PCT/JP2008/064969
国際出願日 22.08.2008
IPC
G11B 7/09 2006.01
G物理学
11情報記憶
B記録担体と変換器との間の相対運動に基づいた情報記録
7光学的手段による記録または再生,例.光ビームの照射による記録,低パワー光ビームを用いる再生;そのための記録担体
08記録担体に相対的なヘッドまたは光源の配置または取付け
09変換動作中における光ビームと記録担体との相対的な整列関係を維持するために光ビームまたは焦平面を動かす手段を有するもの,例.記録担体の表面不規則性またはトラック追従性を補償するためのもの
G11B 7/13 2012.01
G物理学
11情報記憶
B記録担体と変換器との間の相対運動に基づいた情報記録
7光学的手段による記録または再生,例.光ビームの照射による記録,低パワー光ビームを用いる再生;そのための記録担体
12ヘッド,例.光ビームスポットの形成または光ビームの変調
13そのための光検出器
G11B 7/135 2012.01
G物理学
11情報記憶
B記録担体と変換器との間の相対運動に基づいた情報記録
7光学的手段による記録または再生,例.光ビームの照射による記録,低パワー光ビームを用いる再生;そのための記録担体
12ヘッド,例.光ビームスポットの形成または光ビームの変調
135光源から記録担体にまたは記録担体から光検出器に光ビームを案内する手段
CPC
G11B 2007/0013
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
0009for carriers having data stored in three dimensions, e.g. volume storage
0013for carriers having multiple discrete layers
G11B 7/0909
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;
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
0908for focusing only
0909by astigmatic methods
G11B 7/094
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;
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
094Methods and circuits for servo offset compensation
G11B 7/131
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
131Arrangement of detectors in a multiple array
G11B 7/1365
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
G11B 7/1369
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
1369Active plates, e.g. liquid crystal panels or electrostrictive elements
出願人
  • 三菱電機株式会社 Mitsubishi Electric Corporation [JP]/[JP] (AllExceptUS)
  • 中井 賢也 NAKAI, Kenya [JP]/[JP] (UsOnly)
発明者
  • 中井 賢也 NAKAI, Kenya
代理人
  • 吉竹 英俊 YOSHITAKE, Hidetoshi
優先権情報
2007-27092318.10.2007JP
公開言語 (言語コード) 日本語 (JA)
出願言語 (言語コード) 日本語 (JA)
指定国 (国コード)
発明の名称
(EN) EXTRACTION OPTICAL SYSTEM AND OPTICAL HEAD DEVICE INCLUDING SAME
(FR) SYSTÈME OPTIQUE D'EXTRACTION ET DISPOSITIF DE TÊTE OPTIQUE LE COMPRENANT
(JA) 抽出光学系およびそれを備える光ヘッド装置
要約
(EN)
An extraction optical system capable of separating and extracting a signal light beam and a stray light beam with a simple constitution and an optical head device including the same. A phase plate (20a) and a phase plate (21a) are +λ/4 phase plates, and a phase plate (20b) and a phase plate (21b) are -λ/4 phase plates. A focal line (Fi_L0) shows the focal line of a stray light beam (Rs_L0), a focal line (Fi_L1) shows the focal line of a reproduction light beam (R_L1), and a focal line (Fi_L2) shows the focal line of a stray light beam (Rs_L2). After the total flux of the reproduction light beam (R_L1) is transmitted through a phase element (21), the direction of polarization thereof is rotated by 90 degrees. The total fluxes of the stray light beams (Rs_L0, Rs_L2) differ from that of the reproduction light beam (R_L1), and even after the total fluxes are transmitted through the phase element (21), the directions of polarization thereof are not rotated.
(FR)
L'invention porte sur un système optique d'extraction capable de séparer et d'extraire un faisceau de lumière de signal et un faisceau de lumière parasite avec une constitution simple et sur un dispositif de tête optique le comprenant. Une plaque de phase (20a) et une plaque de phase (21a) sont des plaques de phase +λ/4 et une plaque de phase (20b) et une plaque de phase (21b) sont des plaques de phase -λ/4. Une ligne focale (Fi_L0) montre la ligne focale d'un faisceau de lumière parasite (Rs_L0), une ligne focale (Fi_L1) montre la ligne focale d'un faisceau de lumière de reproduction (R_L1), et une ligne focale (Fi_L2) montre la ligne focale d'un faisceau de lumière parasite (Rs_L2). Après que le flux total du faisceau de lumière de reproduction (R_L1) a été transmis à travers un élément de phase (21), la direction de polarisation de celui-ci est tournée de 90 degrés. Les flux totaux des faisceaux de lumière parasite (Rs_L0, Rs_L2) diffèrent de celui du faisceau de lumière de reproduction (R_L1), et même après que les flux totaux ont été transmis à travers l'élément de phase (21), les directions de polarisation de ceux-ci ne sont pas tournées.
(JA)
 本発明は、簡易な構成で信号光と迷光とを分離抽出できる抽出光学系およびそれを備える光ヘッド装置を提供することを目的とする。位相板20aおよび位相板21aは+λ/4位相板であり、位相板20bおよび位相板21bは-λ/4位相板である。焦線Fi_L0は迷光Rs_L0の焦線、焦線Fi_L1は再生光R_L1の焦線、焦線Fi_L2は迷光Rs_L2の焦線をそれぞれ示している。再生光R_L1の全光束は、位相素子21の透過後には偏光方向が90度だけ回転した状態となる。迷光Rs_L0,Rs_L2の全光束は、再生光R_L1の全光束とは異なり、位相素子21の透過後にも偏光方向が回転しない。
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