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1. WO2011108105 - HOLOGRAM REPRODUCTION METHOD

Publication Number WO/2011/108105
Publication Date 09.09.2011
International Application No. PCT/JP2010/053573
International Filing Date 04.03.2010
IPC
G11B 7/0065 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
004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
0065Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
G03H 1/26 2006.1
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
HHOLOGRAPHIC PROCESSES OR APPARATUS
1Holographic processes or apparatus using light, infra-red, or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
26Processes or apparatus specially adapted to produce multiple holograms or to obtain images from them, e.g. multicolour technique
CPC
G03H 1/265
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
HHOLOGRAPHIC PROCESSES OR APPARATUS
1Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
26Processes or apparatus specially adapted to produce multiple ; sub-; holograms or to obtain images from them, e.g. multicolour technique
2645Multiplexing processes, e.g. aperture, shift, or wavefront multiplexing
265Angle multiplexing; Multichannel holograms
G03H 1/28
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
HHOLOGRAPHIC PROCESSES OR APPARATUS
1Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
26Processes or apparatus specially adapted to produce multiple ; sub-; holograms or to obtain images from them, e.g. multicolour technique
28superimposed holograms only
G11B 7/083
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
083relative to record carriers storing information in the form of optical interference patterns, e.g. holograms
G11B 7/09
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
Applicants
  • 株式会社 東芝 KABUSHIKI KAISHA TOSHIBA [JP]/[JP] (AllExceptUS)
  • 碓井 隆 USUI, Takashi [JP]/[JP] (UsOnly)
  • 岡野 英明 OKANO, Hideaki [JP]/[JP] (UsOnly)
  • 渡部 一雄 WATABE, Kazuo [JP]/[JP] (UsOnly)
  • 小川 昭人 OGAWA, Akihito [JP]/[JP] (UsOnly)
Inventors
  • 碓井 隆 USUI, Takashi
  • 岡野 英明 OKANO, Hideaki
  • 渡部 一雄 WATABE, Kazuo
  • 小川 昭人 OGAWA, Akihito
Agents
  • 鈴江 武彦 SUZUYE, Takehiko
Priority Data
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) HOLOGRAM REPRODUCTION METHOD
(FR) PROCÉDÉ DE REPRODUCTION D'HOLOGRAMME
(JA) ホログラム再生方法
Abstract
(EN) The disclosed hologram reproduction method is provided with: a step for altering one of either the angle of rotation of an optical information recording medium, wherein a hologram is formed that arises by means of interference of reference light and information light that contains information, around a second axis that is perpendicular to a first axis that is used for performing angular multiplexing recording by changing the rotational angle around the axis, or the angle of incidence of the aforementioned reference light, and radiating the aforementioned reference light onto the aforementioned hologram formed at the aforementioned optical information recording medium while causing rotation around said first axis, producing reproduced light; a step for detecting the aforementioned reproduced light with a photodetector provided with at least two light-receiving regions symmetrically with respect to the light center axis by a dividing line in a direction parallel to the direction of rotation around the aforementioned first axis, and producing an error signal representing the phase difference and the polarity of signals corresponding to the light strength between two light-receiving regions that are symmetrical with respect to the light center axis among the aforementioned at least two light-receiving regions detected by the aforementioned photodetector; and a step for causing rotation of the angle around the aforementioned second axis and controlling said angle in a manner so that the aforementioned error signal becomes zero.
(FR) L'invention porte sur un procédé de reproduction d'hologramme qui comprend les étapes suivantes : la modification soit de l'angle de rotation d'un support d'enregistrement d'informations optique, dans lequel un hologramme est formé qui apparaît au moyen d'une interférence d'une lumière de référence et d'une lumière d'informations qui contient des informations, autour d'un second axe qui est perpendiculaire à un premier axe qui est utilisé pour effectuer un enregistrement par multiplexage angulaire en changeant l'angle de rotation autour de l'axe, soit de l'angle d'incidence de la lumière de référence précitée, et l'irradiation de la lumière de référence précitée sur l'hologramme précité formé au niveau du support d'enregistrement d'informations optique précité tout en provoquant une rotation autour dudit premier axe, produisant une lumière reproduite ; la détection de la lumière reproduite précitée avec un photodétecteur muni d'au moins deux régions de réception de lumière symétriques par rapport à l'axe central de lumière par une ligne de division dans une direction parallèle à la direction de rotation autour du premier axe précité, et la production d'un signal d'erreur représentant la différence de phase et la polarité de signaux correspondant à l'intensité de lumière entre deux régions de réception de lumière qui sont symétriques par rapport à l'axe central de lumière parmi les deux ou plus de deux régions de réception de lumière détectées par le photodétecteur précité, et le fait d'amener une rotation de l'angle autour du second axe précité et de commander ledit angle d'une manière telle que le signal d'erreur précité devient nul.
(JA)  情報を含む情報光と参照光との干渉によって生じるホログラムが形成された光情報記録媒体を、軸周りの回転角度を変更して角度多重記録を行うために使用される第一軸に直交する第二軸周りに回転する角度、又は、前記参照光の入射する角度の何れか一方を変化させて、該第一軸周りに回転させながら前記光情報記録媒体に形成された前記ホログラムに前記参照光を照射して、再生光を取り出す工程と、前記第一軸周りの回転の方向と平行な方向の分割線によって、光軸中心に対して対称に2つ以上の受光領域を設けられたフォトディテクタで前記再生光を検出し、前記フォトディテクタで検出した前記2つ以上の受光領域のうちの光軸中心に対して対称な2つの受光領域間での光強度に応じた信号の位相差および極性を示す誤差信号を取り出す工程と、前記誤差信号をゼロになるように前記第二軸回りの角度を回転させて該角度を制御する工程と、を具備する。
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