An optical track format of a holographic storage optical disc includes a lead-in area, a data area and a lead-out area. The data area is provided with data holographic positioning marks for marking reading/writing position of data holograms on the optical track and start positioning marks for marking position on the optical track where data holograms start to be recorded. The start positioning marks may also contain address encoding information. Such optical track can be encoded by performing binary encoding by length of the optical track between two consecutive notches, or performing binary encoding by high and low levels of a level signal.
G03H 1/00 - Procédés ou appareils holographiques utilisant la lumière, les infrarouges ou les ultraviolets pour obtenir des hologrammes ou pour en obtenir une imageLeurs détails spécifiques
G03H 1/22 - Procédés ou appareils pour obtenir une image optique à partir d'un hologramme
A holographic storage optical system includes a storage medium, a recording unit, an imaging unit and a servo unit. The recording unit comprises a movable Fourier lens, by which the positions and irradiation angles of a signal light spot and a reference light spot are adjusted. The servo unit comprises a calibration lens for adjusting the positions of a servo light spot in the horizontal and vertical directions so that the servo light spot is located at an optimal position relative to signal light beam and reference light beam. The beam calibrating method comprises (1) before recording a data hologram, burning a calibration hologram at a calibration holographic positioning mark on an optical track of a storage medium; (2) before reproducing the data hologram, using the calibration hologram to optimize the signal-to-noise ratio of the hologram reproduced by adjusting the calibration lens and the Fourier lens.
G03H 1/00 - Procédés ou appareils holographiques utilisant la lumière, les infrarouges ou les ultraviolets pour obtenir des hologrammes ou pour en obtenir une imageLeurs détails spécifiques
G03H 1/04 - Procédés ou appareils pour produire des hologrammes
G03H 1/22 - Procédés ou appareils pour obtenir une image optique à partir d'un hologramme
G11B 7/0065 - Enregistrement, reproduction ou effacement en utilisant des dessins d'interférence optique, p. ex. des hologrammes
G11B 7/24 - Supports d’enregistrement caractérisés par la forme, la structure ou les propriétés physiques, ou par le choix du matériau
3.
TRANSMISSION-TYPE HOLOGRAPHIC OPTICAL STORAGE MEDIUM AND DEVICE, AND METHOD FOR RECORDING AND READING ON TWO SIDES OF STORAGE MEDIUM
A transmission-type holographic optical storage medium includes a first substrate, a second substrate, a recording layer and a dichroic layer. The recording layer is used for recording a hologram with data information. One side of the second substrate facing the recording layer is engraved with a concave-convex structure for a servo light beam to position a recording/reading position and achieve a servo track locking function. The dichroic layer can reflect the servo light beam and transmit recording/reading light. The storage medium according to the present invention is less susceptible to influence of external environment and is more stable compared with a conventional reflection-type storage medium. In addition, recording and reading on two sides can be achieved without separately designing a recording layer on both sides of the storage medium, thereby simplifying the processing technology thereof
G03H 1/00 - Procédés ou appareils holographiques utilisant la lumière, les infrarouges ou les ultraviolets pour obtenir des hologrammes ou pour en obtenir une imageLeurs détails spécifiques
G03H 1/02 - Procédés ou appareils holographiques utilisant la lumière, les infrarouges ou les ultraviolets pour obtenir des hologrammes ou pour en obtenir une imageLeurs détails spécifiques Détails
G11B 7/0065 - Enregistrement, reproduction ou effacement en utilisant des dessins d'interférence optique, p. ex. des hologrammes
4.
High-speed parallel reproducing holographic disk reading method and device
The present patent relates to a parallel reproducing holographic disk reading method and device, and belongs to the technical field of optical holographic storage. According to an angle-shift multiplexing method included in the present patent, multiplex recording is performed by simultaneously changing an incident angle of a reference light and moving a medium with a fixed angle change amount and a fixed shift amount. In this method, the reference light can be split for incidence, and then holograms in different units can be simultaneously reproduced. According to the method disclosed by the patent, a recorded hologram can be read and written in real time, and a recorded signal can be checked under a condition of satisfying a response time required by the medium.
G11B 7/0065 - Enregistrement, reproduction ou effacement en utilisant des dessins d'interférence optique, p. ex. des hologrammes
G03H 1/26 - Procédés ou appareils adaptés spécialement pour produire des hologrammes multiples ou pour en obtenir des images, p. ex. procédés pour l'holographie à plusieurs couleurs
G11B 7/08 - Dispositions ou montage des têtes ou des sources lumineuses par rapport aux supports d'enregistrement
5.
Reflective holographic optical storage method and device
The present invention discloses a reflective holographic storage method and device, in which a reflection layer is plated on a back side of a holographic storage medium, and a new reference light is formed by utilizing the reflection layer, so that a phase conjugate reproduction light of a hologram is obtained. According to the invention, a recording device and a reading device can be provided on the same side of a medium, thereby obtaining a more compact system, reducing design difficulty, improving system stability, and improving the SNR (signal-noise ratio) of reproduction light by the interference between reproduction light and a conjugate reproduction light.
G11B 7/0065 - Enregistrement, reproduction ou effacement en utilisant des dessins d'interférence optique, p. ex. des hologrammes
H04N 5/89 - Enregistrement du signal de télévision utilisant l'enregistrement holographique
G03H 1/26 - Procédés ou appareils adaptés spécialement pour produire des hologrammes multiples ou pour en obtenir des images, p. ex. procédés pour l'holographie à plusieurs couleurs
G11B 7/08 - Dispositions ou montage des têtes ou des sources lumineuses par rapport aux supports d'enregistrement
6.
Holographic storage method and device based on angle-shift multiplexing
The invention discloses a holographic multiplex recording method, which combines technical advantages of angle multiplexing and shift multiplexing, and improves capacity and stability of a system. A medium contracts and expands due to environmental temperature fluctuations, which causes broken Bragg condition. However, the angle multiplexing has the advantages that the broken Bragg condition caused by contraction and expansion of the medium can be corrected by controlling an incident angle of a reference beam and an emitting wavelength of a laser, and the problem of a weak reproduction signal caused by the environmental temperature fluctuations is solved. On the other hand, the advantages of shift multiplex recording are that cross-write noise is not accumulated and that a multiplexing number can be improved by using a cross-shift multiplex method. According to the present invention, a large-capacity recording device with high stability is realized by combining the two technologies.
The invention relates to a positioning method and device for a hologram in a card-type holographic storage medium, which can be used for beam positioning of cross-shift multiplexing and belong to the technical field of optical holographic storage. A guide groove in a grid shape is engraved on a card-type storage medium, and is provided with positioning markers. Each marker includes position information and direction information, can control an optical head to move along the guide groove, and shift multiplexing/reproducing is performed when recognizing the positioning markers. Since the card-type medium is adopted, a 90-degree rotation can be executed three times, and a total of four times of shift multiplex recording is performed. Random access can be achieved even in a medium that is rotated and used by adopting the positioning method and device described in the present invention.
The present invention relates to a holographic storage device and method for simultaneously recording and reading on two sides, and pertains to the technical field of optical holographic storage. The device and method disclosed in the present invention use a characteristic that orthogonal light would not interfere with each other and a Bragg selectivity characteristic for holographic storage, and use two optical heads to constitute two interference fields orthogonal in polarization directions on two sides of a same position of a holographic storage medium, so as to perform two-path simultaneous recording and reading on a hologram. The device and method provided in the present invention implement two-path parallel recording and reading of holographic storage, and combine shift multiplexing and circumferential rotation multiplexing, thereby improving the speed of an information data recording and reading process while increasing a capacity of the holographic storage.
G11B 7/00 - Enregistrement ou reproduction par des moyens optiques, p. ex. enregistrement utilisant un faisceau thermique de rayonnement optique, reproduction utilisant un faisceau optique à puissance réduiteSupports d'enregistrement correspondants
G11B 7/0065 - Enregistrement, reproduction ou effacement en utilisant des dessins d'interférence optique, p. ex. des hologrammes
G11B 7/08 - Dispositions ou montage des têtes ou des sources lumineuses par rapport aux supports d'enregistrement
According to a positioning method for a hologram in a disk-type holographic storage medium, a guide groove is formed in advance in the disk-type storage medium and is scribed with a positioning marker that includes index information, position information and crossing angle information. The positions of a positioning laser beam and a recording/reproducing laser beam are applied to the same medium position. When an optical head accesses a recording/reading position at a high speed, the shift multiplex recording/reading is performed starting from a marker position. A servo system controls the laser beams to move along the guide groove and ensures that a focused beam is focused on the medium. According to the method, the position and angular information can be quickly positioned in process of performing cross-shift multiplex recording/reading, the recording/reading speed of the system is improved, and random access is achieved.
The present invention relates to the technical field of holographic multiplexing storage, and in particular, to a multiplexing method for increasing storage capacity in a disc-type holographic storage medium. According to the method disclosed by the present invention, holograms with different grating vector directions can be overwritten and recorded in the same storage medium according to Bragg selection characteristics of volume holographic records, and the obtained holograms do not affect each other. According to the method disclosed by the present invention, on the premise of ensuring low crosstalk between data pages, the multiplexing number of shift multiplexing storage is increased by using a cross-shift multiplexing method, and the storage density is improved.
G11B 7/0065 - Enregistrement, reproduction ou effacement en utilisant des dessins d'interférence optique, p. ex. des hologrammes
G11B 7/08 - Dispositions ou montage des têtes ou des sources lumineuses par rapport aux supports d'enregistrement
G03H 1/26 - Procédés ou appareils adaptés spécialement pour produire des hologrammes multiples ou pour en obtenir des images, p. ex. procédés pour l'holographie à plusieurs couleurs
11.
Holographic data storage device with single-arm structure
The present invention relates to a holographic data storage device with a single-arm structure, and belongs to the technical field of optical holographic storage. According to the device disclosed in the present invention, a part of a reference arm and a part of a signal arm are integrated together to form a single-arm structure, which can not only reduce the number of optical and mechanical elements, but also reduce the system volume and cost without degrading performance. In addition, a signal beam and a reference beam share the same relay lens, so that the impact of environmental interference on the two beams is equal, and the stability of the entire system is improved.
A holographic multiplexed recording method for increasing storage capacity is disclosed. In a holographic recording and reproducing device, the moving direction of a storage medium is not coplanar with the plane where the optical axes of signal light and reference light are located, or the relative moving direction of the storage medium and the signal light or the reference light is not coplanar with the plane where the optical axes of the signal light and the reference light are located. Through the method, a certain angle exists between the grating vector direction and the moving direction or the relative moving direction, so that the phenomenon that the grating vector directions are the same does not occur when the medium is subjected to multiplexed recording after being rotated or flipped. Not only is multiplexing number increased, but also crosstalk caused by the same grating vector direction is prevented.
G11B 7/0065 - Enregistrement, reproduction ou effacement en utilisant des dessins d'interférence optique, p. ex. des hologrammes
H04N 5/89 - Enregistrement du signal de télévision utilisant l'enregistrement holographique
G11B 7/08 - Dispositions ou montage des têtes ou des sources lumineuses par rapport aux supports d'enregistrement
G03H 1/26 - Procédés ou appareils adaptés spécialement pour produire des hologrammes multiples ou pour en obtenir des images, p. ex. procédés pour l'holographie à plusieurs couleurs
13.
Opening and closing device of rotating cage type jukebox disc tray
An opening and closing device comprises a disc tray, a mounting shaft and a jukebox manipulator. The disc tray is mounted on the mounting shaft. A positioning structure is provided between the disc tray and the mounting shaft. The mounting shaft is mounted on an outer circumference of a jukebox rotating cage. The jukebox manipulator is mounted on a manipulator driving unit. A side of the manipulator driving unit is provided with an optical drive, the jukebox manipulator is provided with a driving plate structure and the disc tray is provided with a driving lever. When the jukebox rotating cage rotates, the disc tray can revolve around the rotating shaft of jukebox rotating cage and can rotate around the mounting shaft. With the assistance of in-place bumping post which is provided by a side of the jukebox rotating cage, the positioning structure can locate the rotation of disc tray at a fixed static angle.
G11B 17/22 - Guidage des supports d'enregistrement n'ayant pas spécifiquement la forme d'un fil ou d'une bande ainsi que de leurs supports avec magasin prévu pour la prise des disques au hasard
G11B 33/04 - ÉbénisterieBoîtiersBâtisDisposition des appareils dans ou sur ceux-ci modifiés pour le rangement des supports d'enregistrement
G11B 17/24 - Guidage des supports d'enregistrement n'ayant pas spécifiquement la forme d'un fil ou d'une bande ainsi que de leurs supports avec magasin prévu pour la prise des disques au hasard le magasin ayant une forme toroïdale ou partiellement toroïdale
G06F 3/06 - Entrée numérique à partir de, ou sortie numérique vers des supports d'enregistrement
14.
OPENING AND CLOSING DEVICE OF ROTATING CAGE TYPE JUKEBOX DISC TRAY
An opening and closing device of a rotating cage type jukebox disc tray, comprising a disc tray (2), a mounting central spindle (3) and a jukebox manipulator (5). One end of the disc tray (2) is mounted on the mounting central spindle (3) and the other end of the disc tray (2) carries compact discs (11); a positioning structure is arranged on a mating surface between the disc tray (2) and the mounting central spindle (3); the mounting central spindle (3) is mounted on the excircle of a jukebox rotating cage (4) and is parallel to the rotating central spindle (1) of the jukebox rotating cage (4); the jukebox manipulator (5) is mounted on a manipulator driving device (12); the manipulator driving device (12) is moved in a direction parallel to the geometrical axis of the rotating central spindle (1); a compact disc drive (13) is arranged by the side of the manipulator driving device (12); the jukebox manipulator (5) is provided thereon with a driving plate mechanism (6); a driving lever (7) is mounted on the disc tray (2); when the jukebox rotating cage (4) rotates in a designated direction, the disc tray (2) can revolve around the rotating central spindle (1) of the jukebox rotating cage (4) and also rotate around the mounting central spindle (3); and with the help of an in-place blocking post (10) arranged by the side of the jukebox rotating cage (4), the positioning structure can rotate and position the disc tray (2) at a fixed stop angle. The box opening and closing speeds are increased and the positioning precision is improved.
G11B 17/22 - Guidage des supports d'enregistrement n'ayant pas spécifiquement la forme d'un fil ou d'une bande ainsi que de leurs supports avec magasin prévu pour la prise des disques au hasard
brevets
