WO2004019330A1 - ホログラムシステム - Google Patents
ホログラムシステム Download PDFInfo
- Publication number
- WO2004019330A1 WO2004019330A1 PCT/JP2003/006143 JP0306143W WO2004019330A1 WO 2004019330 A1 WO2004019330 A1 WO 2004019330A1 JP 0306143 W JP0306143 W JP 0306143W WO 2004019330 A1 WO2004019330 A1 WO 2004019330A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- recording medium
- recording
- sector
- diffraction grating
- Prior art date
Links
- 230000001427 coherent effect Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000004044 response Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001093 holography Methods 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 238000004091 panning Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10554—Moving beam scanning
- G06K7/10594—Beam path
- G06K7/10603—Basic scanning using moving elements
- G06K7/10663—Basic scanning using moving elements using hologram
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording 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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
Definitions
- the present invention relates to a holographic recording medium and a recording / reproducing system using the same.
- a holographic memory system has been known as a digital recording system using the principle of holography.
- a holographic memory system records and reproduces bright and dark dot pattern data on a photorefractive crystal recording medium such as lithium niobate, for example.
- data can be recorded and reproduced in units of two-dimensional plane pages, and multiplex recording can be performed using a plurality of pages.
- a recording medium which is one type of Fourier transform hologram, the image is recorded as a two-dimensional image page unit in a three-dimensional space of the recording medium. The outline of the recording / reproducing system will be described below.
- the encoder 25 converts digital data to be recorded on the recording medium 1 as a bright and dark dot pattern image on a plane, and rearranges the data into, for example, a data array of 480 bits in length and 640 bits in width to unit page Generate data.
- a panel of a transmissive TFT liquid crystal display device (Thin Film Transistor Liquid Crystal Disp 1 ay) (hereinafter also referred to as LCD) may be used as the data.
- the spatial light converter 12 has a modulation processing unit of 480 pixels vertically and 640 pixels horizontally corresponding to a unit page, and spatially converts the irradiated signal light beam according to the unit page sequence data from the encoder 25.
- the optical signal is optically modulated into an on / off signal of the optical signal, and the modulated signal light is guided to the lens 13. More specifically, the spatial light converter 12 passes the signal light beam in response to the logical value “1” of the unit page sequence data, which is an electric signal, and shuts off the signal light beam in response to the logical value “0”. As a result, electro-optical conversion according to each bit content in the unit page data is achieved, and a modulated signal light beam as a signal light of a unit page sequence is generated.
- the signal light enters the recording medium 1 via the lens 13.
- the reference light enters the recording medium 1 at an angle (hereinafter, referred to as “incident angle”) from a predetermined reference line orthogonal to the optical axis of the signal light beam.
- the signal light and the reference light interfere with each other in the recording medium 1, and the interference fringes are stored in the recording medium 1 as a refractive index grating, thereby recording data.
- the recording medium 1 as a refractive index grating, thereby recording data.
- a large amount of information can be recorded.
- the recorded data is reproduced from the recording medium 1
- only the reference light is incident on the refractive index grating of the recording medium 1 at the same incident angle i3 as at the time of recording. That is, unlike during recording, no signal light is incident.
- the diffraction light from the refractive index grating recorded in the recording medium 1 is guided to the photodetector 22 such as a CCD (Charge Coupled Device) through the lens 21.
- the photodetector 22 converts the brightness of the incident light into The signal is converted, and an analog electric signal having a level corresponding to the luminance of the incident light is output to the decoder 26.
- the decoder 26 compares this analog signal with a predetermined amplitude value (slice level) and reproduces the corresponding data of "1" and "0".
- the optical distortion between the spatial light converter and the photodetector caused by the recording medium, the displacement of the signal image, and the like had to be kept within specified values.
- the reproduced image may vary due to variations in the position between the recording medium and the CCD image sensor during recording and reproduction. The deviation is so large that the CCD or the recording medium must be strictly adjusted in accordance with the deviation, and one of the drawbacks is that there is a problem with compatibility.
- one of the problems to be solved by the present invention is to provide a compatible hologram system. Disclosure of the invention
- the hologram system includes a support section for freely mounting a recording medium made of a photosensitive material such as a photorefractive polymer, a hole-panning material, and a photochromic material, and coherent light modulated according to predetermined data.
- a signal beam generating unit for injecting a beam into the recording medium and providing a three-dimensional light interference pattern therein to generate a refractive index grating; and detecting reproduction data by diffracted light from the refractive index grating to obtain predetermined data.
- a hologram system comprising:
- the recording medium has a reference refractive index grating corresponding to a three-dimensional light interference pattern of a coherent light beam modulated according to a reference data in a reference data area in advance, ⁇
- the reproduction data is corrected and demodulated to predetermined data according to the reference data reproduced from the reference refractive index grating in the reference data area and reference data provided in the reference memory.
- FIG. 1 is a diagram showing a configuration of a conventional recording / reproducing system.
- FIG. 2 is a side view showing the configuration of the hologram system according to the present invention.
- FIG. 3 is a plan view showing a configuration of a card-shaped recording medium in the hologram system according to the present invention.
- the reproduced data is corrected based on the hologram recording / reproducing device and the reference data respectively held in the recording medium.
- the difference between the recorded original data and the reproduced data is the difference between the recording format, such as the difference in the amount of page data, the recording error, such as individual differences between devices, the performance error of the recording medium, and the reproduction optics. This is the case where both data are different due to changes in reproduction information due to reproduction errors such as individual differences in the system and changes due to disturbances.
- FIGS. 2 and 3 show an example of a hologram system including a recording medium according to the present invention and a hologram recording / reproducing apparatus using the recording medium.
- FIG. 3 shows a card-shaped recording medium 10 made of a photorefractive polymer. Force In the disk-shaped recording medium 10, the reference data 311 such as R2 is previously recorded on the recording medium at the time of shipment, a reference data area 301 in which R2 is prerecorded, sector data 312 a sector data area 302 in which prerecording is performed, and user data 313. A user data area 303 for recording is provided side by side.
- a reference data is defined for each recording format.
- Various reference data 311 for each other recording medium format are defined, and are recorded in the reference data area 301 of the recording medium at the time of shipment.
- each reference data 102 is recorded in the reference memory 101 of the data processing unit 103 in advance.
- the recording medium 10 When the recording medium 10 is loaded on the support section 19 of the hologram recording / reproducing apparatus, the reference data 311 of the reference data area 301 recorded before shipment is reproduced, and the type of the recording medium 10 is determined. Perform each operation.
- the user data 313 is recorded, and the reference data 312 (for example, R) defined in the recording medium format is stored in the sector data area 302 of the recording medium 10 which is determined according to the sector in which the user data is recorded. Record 2).
- the reference data defined in the recording medium format recorded in the sector data area 302 by one of the hologram recording / reproducing devices (self or other) 3 1 2 (here, R 2) is reproduced, and the difference between the reproduced reference data and the reference data in the memory of the hologram recording / reproducing device is determined by the recording error of the hologram recording / reproducing device recording this recording medium and the self-reproduction.
- the total error is E1.
- the predetermined data By demodulating the data recorded on the recording medium while taking the difference E1 into account, even if the reproduced data is different from the predetermined data, the predetermined data can be correctly reproduced.
- other sector information such as a data index, a data amount, and a data format can be recorded as sector data.
- the light beam emitted from the laser 15 is divided into two parts: a signal light beam that travels straight at the beam splitter 16 and a reference light beam that deflects upward. It is guided to the optical path of the optical system.
- the signal light beam that has passed through the beam splitter 16 enters the recording medium 10 through the shirt 6a, the light beam expander 14, the spatial light converter 12 and the Fourier transform lens 13.
- the signal light beam is irradiated with a light beam onto the recording medium by an automatic shutter controlled by a controller, and is expanded by a beam expander 14 into parallel light having a predetermined diameter.
- the spatial light converter 12 is, for example, a two-dimensional plane LCD of 480 pixels vertically by 640 pixels horizontally.
- the spatial light converter 12 transmits light from the beam expander 14.
- the light beam is converted into a signal light.
- the spatial light converter 12 spatially modulates the transmission / non-transmission of each pixel according to the recording page data using a two-dimensional dot pattern such as a checkerboard pattern, and then Fourier-transforms it with a Fourier transform lens 13.
- the light is condensed on the recording medium 10 and is formed as a point image on the Fourier plane.
- the Fourier plane by the lens 13 is parallel to the surface of the recording medium 10.
- the reference light beam optical system the reference light beam is reflected by the mirrors 17 and 18 and is incident on the recording medium 10, and crosses the signal light beam from the lens 13 at a position inside the recording medium to cause interference. Create 3D interference fringes.
- an optical system such as a mirror 18 and a lens 13 may be arranged so that the reference light and the signal light do not interfere with each other on the Fourier plane but on the front side or the rear side of the floor plane.
- the signal light and the reference light are simultaneously irradiated to a predetermined portion in the recording medium 10 and the interference pattern is recorded as a refractive index grating having a changed refractive index.
- the hologram formation time is controlled by an automatic shirt of the laser light source device.
- a support section 19 on which the recording medium 10 is placed, for example, parallel to a plane perpendicular to the optical axis of the signal light is driven by a drive section (not shown).
- the drive unit is controlled by the controller 20.
- the controller 20 drives and adjusts the position of the recording medium 10 by driving the support 19 in accordance with a signal corresponding to the positioning data from the photodetector 22.
- the recorded recording medium 10 is placed on the supporting portion 19 as in the case of recording, and the closing of the shirt 6a and the automatic shutter control of the laser light source device are controlled by the controller 20. And only the reference light from the mirror 18 is incident.
- Diffracted light from the interference fringes recorded in the recording medium 10 enters the photodetector 22 through the inverse Fourier transform lens 21 as reproduction light, and forms a reproduced image.
- the photodetector 22 has, for example, a two-dimensional plane light receiving surface of 480 pixels vertically and 640 pixels horizontally similar to the spatial light converter 12, and converts the received reproduction light into an electric signal. And output to the decoder 26.
- the decoder 26 compares the input electric signal with a predetermined slice level and outputs binary digital data.
- a similar recording / reproducing system can be realized by using a recording medium such as a disk.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Holo Graphy (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003242310A AU2003242310A1 (en) | 2002-08-01 | 2003-05-16 | Hologram system |
EP03730502A EP1531461A1 (en) | 2002-08-01 | 2003-05-16 | Hologram system |
US10/522,679 US20060164705A1 (en) | 2002-08-01 | 2003-05-16 | Hologram system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-225054 | 2002-08-01 | ||
JP2002225054A JP2004069771A (ja) | 2002-08-01 | 2002-08-01 | ホログラムシステム |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004019330A1 true WO2004019330A1 (ja) | 2004-03-04 |
Family
ID=31943810
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/006143 WO2004019330A1 (ja) | 2002-08-01 | 2003-05-16 | ホログラムシステム |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060164705A1 (ja) |
EP (1) | EP1531461A1 (ja) |
JP (1) | JP2004069771A (ja) |
AU (1) | AU2003242310A1 (ja) |
WO (1) | WO2004019330A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100378817C (zh) * | 2005-03-14 | 2008-04-02 | 富士通株式会社 | 光学记录介质的再现装置、记录/再现装置和再现方法 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006268907A (ja) * | 2005-03-22 | 2006-10-05 | Fujitsu Ltd | ホログラム記録媒体および記録再生装置 |
US7898924B2 (en) * | 2006-09-07 | 2011-03-01 | International Business Machines Corporation | Apparatus, system, and method for calibrating a holographic storage device |
EP2231030B1 (en) | 2007-12-21 | 2019-02-27 | MicroVention, Inc. | System and method for locating detachment zone of a detachable implant |
US9049413B2 (en) | 2013-07-30 | 2015-06-02 | Dolby Laboratories Licensing Corporation | Multiple stage modulation projector display systems having efficient light utilization |
BR112016001699B1 (pt) * | 2013-07-30 | 2022-12-06 | Dolby Laboratories Licensing Corporation | Sistema de exibição de projetor tendo direcionamento de feixe de espelho não mecânico |
WO2016174798A1 (ja) * | 2015-04-27 | 2016-11-03 | ソニー株式会社 | ホログラム記録用組成物、ホログラム記録媒体および画像表示装置、並びにホログラム記録媒体の製造方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0997216A (ja) * | 1995-07-25 | 1997-04-08 | Sony Corp | 信号記録装置、信号記録媒体、及び信号再生装置 |
JPH1093546A (ja) * | 1996-09-19 | 1998-04-10 | Dainippon Printing Co Ltd | 情報記録媒体を用いた暗号化システム及び暗号化情報用記録媒体 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6081912A (en) * | 1996-12-26 | 2000-06-27 | Lucent Technologies Inc. | Method for modulating data for storage in page-wise memory |
US6064586A (en) * | 1998-12-31 | 2000-05-16 | Siros Technologies, Inc. | Method for holographic data storage and retrieval |
-
2002
- 2002-08-01 JP JP2002225054A patent/JP2004069771A/ja not_active Abandoned
-
2003
- 2003-05-16 US US10/522,679 patent/US20060164705A1/en not_active Abandoned
- 2003-05-16 AU AU2003242310A patent/AU2003242310A1/en not_active Abandoned
- 2003-05-16 WO PCT/JP2003/006143 patent/WO2004019330A1/ja not_active Application Discontinuation
- 2003-05-16 EP EP03730502A patent/EP1531461A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0997216A (ja) * | 1995-07-25 | 1997-04-08 | Sony Corp | 信号記録装置、信号記録媒体、及び信号再生装置 |
JPH1093546A (ja) * | 1996-09-19 | 1998-04-10 | Dainippon Printing Co Ltd | 情報記録媒体を用いた暗号化システム及び暗号化情報用記録媒体 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100378817C (zh) * | 2005-03-14 | 2008-04-02 | 富士通株式会社 | 光学记录介质的再现装置、记录/再现装置和再现方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1531461A1 (en) | 2005-05-18 |
JP2004069771A (ja) | 2004-03-04 |
AU2003242310A1 (en) | 2004-03-11 |
US20060164705A1 (en) | 2006-07-27 |
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