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1. WO2008032865 - OPTICAL DISC DEVICE, FOCAL POINT POSITION CONTROL METHOD, AND RECORDING MEDIUM

Publication Number WO/2008/032865
Publication Date 20.03.2008
International Application No. PCT/JP2007/068318
International Filing Date 13.09.2007
IPC
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording 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
08
Disposition or mounting of heads or light sources relatively to record carriers
09
with 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
[IPC code unknown for G11B 7/065]
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording 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
12
Heads, e.g. forming of the optical beam spot or modulation of the optical beam
125
Optical 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
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording 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
24
Record carriers characterised by shape, structure or physical properties, or by the selection of the material 
G11B 7/09 (2006.01)
G11B 7/0065 (2006.01)
G11B 7/125 (2006.01)
G11B 7/24 (2006.01)
CPC
G11B 7/0065
G11B 7/083
G11B 7/0908
G11B 7/0938
G11B 7/24044
Applicants
  • ソニー株式会社 SONY CORPORATION [JP/JP]; 〒1080075 東京都港区港南1丁目7番1号 Tokyo 1-7-1 Konan, Minato-ku, Tokyo 1080075, JP (AllExceptUS)
  • 齊藤 公博 SAITO, Kimihiro [JP/JP]; JP (UsOnly)
  • 堀籠 俊宏 HORIGOME, Toshihiro [JP/JP]; JP (UsOnly)
  • 近藤 高男 KONDO, Takao [JP/JP]; JP (UsOnly)
  • 林 邦彦 HAYASHI, Kunihiko [JP/JP]; JP (UsOnly)
  • 小林 誠司 KOBAYASHI, Seiji [JP/JP]; JP (UsOnly)
  • 岩村 貴 IWAMURA, Takashi [JP/JP]; JP (UsOnly)
  • 玉田 作哉 TAMADA, Sakuya [JP/JP]; JP (UsOnly)
Inventors
  • 齊藤 公博 SAITO, Kimihiro; JP
  • 堀籠 俊宏 HORIGOME, Toshihiro; JP
  • 近藤 高男 KONDO, Takao; JP
  • 林 邦彦 HAYASHI, Kunihiko; JP
  • 小林 誠司 KOBAYASHI, Seiji; JP
  • 岩村 貴 IWAMURA, Takashi; JP
  • 玉田 作哉 TAMADA, Sakuya; JP
Agents
  • 田辺 恵基 TANABE, Shigemoto; 〒1410032 東京都品川区大崎3丁目6番4号 トキワビル5階 Tokyo Tokiwa Building 5th Floor 6-4, Osaki 3-chome Shinagawa-ku, Tokyo 1410032, JP
Priority Data
2006-24980414.09.2006JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) OPTICAL DISC DEVICE, FOCAL POINT POSITION CONTROL METHOD, AND RECORDING MEDIUM
(FR) DISPOSITIF DE DISQUE OPTIQUE, PROCÉDÉ DE COMMANDE DE POSITION DE POINT FOCAL ET SUPPORT D'ENREGISTREMENT
(JA) 光ディスク装置、焦点位置制御方法及び記録媒体
Abstract
(EN)
It is possible to accurately record or reproduce a hologram expressing information onto/from an optical disc. When recording information onto the optical disc (100), the position of an objective lens (OL1) is controlled according to the detection result of a red color reflected light beam (Lr2) so that a focal point (Fr) follows a target track and a focal point (Fb1) of a blue color light beam (Lb1) is matched with a target mark position by the objective lens (OL1). According to the detection result of the blue color light beam (Lb1) via the objective lens (OL1) and an objective lens (OL2), the position of the objective lens (OL2) is controlled and the focal point (Fb2) is matched with the target mark position, so that the focal point (Fb1) of the blue color light beam (Lb1) and the focal point (Fb2) of the blue color light beam (Lb2) are matched with the target mark position so as to interfere each other. Thus, it is possible to record a recording mark (RM) at the target mark position.
(FR)
Il est possible d'enregistrer ou de reproduire de façon précise des informations exprimant un hologramme sur/à partir d'un disque optique. Lorsque l'on enregistre des informations sur le disque optique (100), la position d'une lentille objectif (OL1) est commandée conformément au résultat de détection d'un faisceau de lumière réfléchi de couleur rouge (Lr2), de telle sorte qu'un point focal (Fr) suit une piste cible et un point focal (Fb1) d'un faisceau de lumière de couleur bleue (Lb1) est apparié à une position de marque cible par la lentille objectif (OL1). Conformément au résultat de détection par le faisceau de lumière de couleur bleue (Lb1) par l'intermédiaire de la lentille objectif (OL1) et d'une lentille objectif (OL2), la position de la lentille objectif (OL2) est commandée et le point focal (Fb2) est apparié à la position de marque cible, de telle sorte que le point focal (Fb1) du faisceau de lumière de couleur bleue (Lb1) et le point focal (Fb2) du faisceau de lumière de couleur bleue (Lb2) sont en correspondance avec la position de marque cible de façon à interférer l'un avec l'autre. Ainsi, il est possible d'enregistrer une marque d'enregistrement (RM) au niveau de la position de marque cible.
(JA)
情報を表すホログラムを光ディスクに対して高精度に記録又は再生できるようにする。光ディスク100に情報を記録する際、赤色反射光ビームLr2の検出結果を基に対物レンズOL1を位置制御することにより焦点Frを目標トラックに追従させ、当該対物レンズOL1により青色光ビームLb1の焦点Fb1を目標マーク位置に合わせ、当該対物レンズOL1及びOL2を介した青色光ビームLb1の検出結果を基に、対物レンズOL2を位置制御して焦点Fb2も目標マーク位置に合わせることにより、青色光ビームLb1の焦点Fb1及び青色光ビームLb2の焦点Fb2を目標マーク位置に一致させて互いに干渉させることができるので、当該目標マーク位置に記録マークRMを記録することができる。
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