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WO2001048740A1 - Dispositif optique d'entrainement de donnees - Google Patents

Dispositif optique d'entrainement de donnees Download PDF

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Publication number
WO2001048740A1
WO2001048740A1 PCT/DE2000/004630 DE0004630W WO0148740A1 WO 2001048740 A1 WO2001048740 A1 WO 2001048740A1 DE 0004630 W DE0004630 W DE 0004630W WO 0148740 A1 WO0148740 A1 WO 0148740A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical data
data drive
light
drive according
beam splitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE2000/004630
Other languages
German (de)
English (en)
Inventor
Steffen Noehte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EML EUROPEAN MEDIA LABORATORY GmbH
Original Assignee
EML EUROPEAN MEDIA LABORATORY GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EML EUROPEAN MEDIA LABORATORY GmbH filed Critical EML EUROPEAN MEDIA LABORATORY GmbH
Priority to DE10084180T priority Critical patent/DE10084180D2/de
Priority to AU30018/01A priority patent/AU3001801A/en
Publication of WO2001048740A1 publication Critical patent/WO2001048740A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1362—Mirrors
    • 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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0025—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with cylinders or cylinder-like carriers or cylindrical sections or flat carriers loaded onto a cylindrical surface, e.g. truncated cones
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/14—Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously

Definitions

  • the present invention relates to an optical data drive according to the preamble of the independent claim.
  • Data storage on optical media per se is known; data is stored on CD-Roms, DVD media, etc., for example. It has also been proposed to store optical data on a generally round information carrier which is optically transparent and is designed such that the information carrier can be read out through a plurality of information carrier layers, this information carrier being wound up in a spiral, see DE-GBM 298 168 02.2.
  • Data storage devices of this type can be read out or written by an internal optical system.
  • a laser light source such as a diode laser
  • the object of the present invention is to provide something new for commercial use.
  • an optical data drive with a read and / or write head which has a functional end surrounded by the storage medium, is proposed, it being provided that the read and / or write head for the reception of light and / or the transmission is formed in two generally diametrically opposite directions.
  • the storage medium can be generally hollow-cylindrical and can preferably be implemented in particular by a winding body.
  • a suitable medium is described in DE 298 16 802.2.
  • the function end and the generally hollow cylindrical storage medium can rotate against each other. It is possible and preferred that the function end is arranged on a driven shaft. This allows the optical data drive with a fixed optical data carrier, how to use a winding body made of PMMA or the like, without this having to be precisely balanced, because it is sufficient to use a static optical storage medium; only the end of the function or the read and / or write head can be precisely balanced once again.
  • the general hohlzylmdharide storage medium When the general hohlzylmdhari storage medium is designed as a winding kelkorper or more concentric layers one above the other, can preferably be connected to the first part of the read and / or write head, a further inner winding layer are scanned, whereas in the generally diametrically entge ⁇ gen opposite direction of the winding layer area lying further outside is detected. In this way, the time for focusing on different winding positions is reduced. It should be mentioned that with such an arrangement, a large data block, which is to be stored as a whole, can be divided up into both internal and external winding layer areas.
  • the functional end is generally balanced.
  • the existing focusing optics are identical at the function ends.
  • the read and / or write head preferably comprises a source for the read and / or write light, in particular a laser diode or the like, which preferably emits non-colmear, in particular divergent, light.
  • a beam splitter is arranged between the focusing optics for the generally diametrically opposite directions with a jerk reflection gate on the passage side of the beam running straight through the beam plate can then be achieved by the path difference of the two diametrically opposed light beams that with such an arrangement see see lenses can be used for the two directions and the arrangement is nevertheless initially balanced, if n different diametric distances are read and / or written in both directions.
  • an e-beam plate it is preferred if it distributes the incident light from the reading and / or writing light source in an intensity ratio of approximately 50:50 to the two diametrically opposite directions.
  • the beam splitter is preferably followed by a reflector for the beam passing through it, it being possible in particular to provide em ⁇ / 4 plates between the beam splitter and the jerk reflector in order to rotate the polarization of the light passing through and to reduce the signal-to-noise ratio by reducing it of crosstalk to improve.
  • the beam splitter is preferably tilted slightly so that the two rays running generally diametrically opposite influence each other less strongly by crosstalk.
  • the beam splitter and preferably the lenses, the ⁇ / 4 plate and the jerk reflector, are located together on a rotary drive.
  • the light received back from the storage medium is preferably with two separate readers and / or write heads. the, but possibly arranged outside the functional end of the detector.
  • These photodetectors are preferably arranged such that the light from the first of the generally diametrically opposite directions is focused on the first photodetector, while light from the second direction is collected on the second photodetector. If, as preferred, this focusing is sufficiently strong and the light from the other direction is sufficiently weakly focused, it is irrelevant if light from both directions still falls on each of the photodetectors, since significant signal components can only be expected from the focused light beam. It can preferably between two Fotodetekto ⁇ ren em beam-splitting element be provided to allocate the whole, from the operative end and thus the optical spei- chermedium jerk light radiated to both photo detectors.
  • Fig. 1 em optical data drive according to the present invention.
  • an optical data drive generally designated 1
  • a read head 2 which has a functional end 4 surrounded by a storage medium 3 and a light source 5 and a photo detection unit 6.
  • the storage medium 3 consists of a winding body made of, for example, 90 layers of PMMA, which are firmly bonded to one another with sufficient clarity by means of a suitable adhesive. Suitable materials for PMMA and connecting intermediate can rule layers be implemented as "Scotch tape kri ⁇ stall clear.”
  • the light source 5 of the reading head 2 comprises a laser diode 5a with suitable control (not shown), and a slightly defocusing scattering lens 5b in order to generate a defocused reading light beam 7.
  • the defocused light beam 7 is directed at the functional end 4, which comprises a beam splitter 8, a ⁇ / 4 plate 9 arranged behind the beam splitter 8 in the passage direction, and a jerk reflector 10.
  • the beam splitter 8 has a beam splitter surface 8a, by means of which half of the incident light in the beam 7 is directed onto a first displaceably mounted lens 11a.
  • the focal length of the lens ⁇ 11a is selected such that it focuses the light on one of the inner wrap layers 12a.
  • the ⁇ / 4 plate 9 and a jerk reflector 10 are provided behind the beam splitter for the light passing through the beam splitter surface 8a to rotate its polarization direction.
  • the jerk reflector 10 is oriented such that the light returns, is reflected at the separating surface 8b and is directed onto the displaceably mounted focusing lens 11b.
  • This lens 11b on the diametrically opposite direction to the lens 11a angeord ⁇ net and the focal length of the lens 11b is selected so that the light is directed to the initial position on the outer layer of the wound storage medium. 3
  • the focal lengths of the lenses 11a, 11b are identical.
  • the lenses lia, 11b are arranged on a unit (not shown) in order to enable their displacement.
  • the Setting range is so large that at least half of all winding layers can be overwritten with the respective focal point of the light, namely the inner half with lens 11a and the outer half with lens 11b.
  • the function end 4 is arranged with the beam splitter 8, the ⁇ / 4 plate 9, the jerk reflector 10, the two lenses 11a, 11b and the associated focusing units on a rotary drive (not shown) which moves the beam splitter at high speed can rotate axis defined by the light beam 7.
  • the function end 4 is balanced.
  • the end of the function can also be moved axially.
  • the lens 11a is further designed to collect the light reflected back from the storage medium 3 at the point 12a and to radiate it into the beam splitter 8 in such a way that it strikes a steel splitter 13, from which it is reflected onto the photodetection unit 6.
  • the lens 11b is designed to collect the light reflected back from the focal point 12b so that it reflects on the surface 8b of the beam plate 8 in the direction of the ⁇ / 4 plate 9 and after passing through it is reflected on the reflector 10, whereupon it is reflected after it has passed through the ⁇ / 4 plate 9 and the beam splitter 8 again, it is thrown back towards the laser light source 5, it being directed onto the photodetection unit 6 by the beam splitter arranged in front of the laser light source.
  • the photodetection unit 6 comprises a beam splitter 13, which is arranged in the beam path between the beam splitter cube 8 and the defocusing upper lens 5b in order to prevent the areas Chen 12a and 12b to return received light towards two photodetectors 16a, 16b.
  • a further beam splitter 14 is arranged downstream of the beam splitter 13, by means of which light is directed onto a lens 15a which is connected upstream of the first photodetector 16a.
  • the lens 15a and the photodetector 16a are arranged such that the light from the storage medium region 12a is focused on the photodetector 16a.
  • Behind the beam splitter 14, a lens 15b is provided in the direction of passage, with which light is focused on a photodetector 16b.
  • L se 15b and photodetector 16b are arranged so that the light from the storage medium area 12b is focused on the photodetector 16b.
  • the optical data drive 1 of the present invention operates as follows:
  • the described storage medium 3 is placed in its position around the functional end 4 of the reading head 2 and, if necessary, a cover is closed (not shown). The end of the function is then rotated 4 m within the storage medium and moved into a desired axial position.
  • the laser light source 5a is excited and sends a beam 7 through the beam splitter 13 in the direction of the beam splitter 8.
  • the lens 11a is focused on a desired angular position.
  • the first part of the beam 7 is directed at the beam splitter 8 m in the direction of the lens 11a, which focuses the beam onto the axially desired storage area 12a.
  • the other part of the complementary light beam 7 passes back through further expansion through the beam splitter 8, the ⁇ / 4 plate 9, under reflection at the reflector 10, with renewed passage through the ⁇ / 4 plate 9 into the beam splitter 8, in which this Part of the beam 7 is directed at the surface 8b onto the lens 11b, which defocuses the beam onto a focused outer winding layer area.
  • the light received by the inner winding layer area 12a on the lens 11a passes through the beam splitter 8 under reflection at the beam splitter 13 m to the photodetection unit 6. There, part of the light is directed by the steel splitter 14 onto the lens 15a and from there onto the photodetector 16a , This results in a precise focus in the photo detector 16a em. A further part of the light originating from the area 12a passes through the beam splitter 14 into the lens 15b and is directed by the latter into the photodetection unit 16b. However, due to the divergence of the incident beam 7, which affects the entire beam path, there is no sharp focal point for the light from the storage area 12a on the photodetector 16b.
  • the light from the inner winding storage area 12b also reaches the beam splitter 13 after passing through the functional end 4 and is partially reflected on the beam splitter 14, while at the same time it is partially transmitted. Due to the divergence of the beam 7 at the photodetector 16a, there is no sharp focus of the light coming from the area 12b, while this light coming from the area 12b of the storage medium 3 is sharply focused on the photodetector 16b by the lens 15. This results in a sharp image of the light received back from the winding layer area 12a only on the photodetector unit 16a, while a sharp image is obtained Image of the light received back from the winding layer area 12b results only on the photodetector 16b.
  • the modulation of the received light signals is then determined at the photodetectors 16a, 16b. This modulation is dependent on the data stored in the storage medium and read out sequentially, which are stored in binary form by changing the optical properties of the storage medium, in particular its refractive index.
  • Storage medium 3 received light signals thus allow the decoding and evaluation of the information stored in the storage medium 3.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Abstract

Dispositif optique d'entraînement de données comprenant une tête de lecture et/ou une tête d'écriture présentant une extrémité fonctionnelle entourée par un milieu à mémoire, caractérisé en ce que la tête de lecture et/ou d'écriture est configurée pour la réception de la lumière et/ou l'émission de la lumière suivant deux directions généralement diamétralement opposées.
PCT/DE2000/004630 1999-12-23 2000-12-22 Dispositif optique d'entrainement de donnees Ceased WO2001048740A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10084180T DE10084180D2 (de) 1999-12-23 2000-12-22 Optisches Datenlaufwerk
AU30018/01A AU3001801A (en) 1999-12-23 2000-12-22 Optical data drive

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999162758 DE19962758A1 (de) 1999-12-23 1999-12-23 Optisches Datenlaufwerk
DE19962758.4 1999-12-23

Publications (1)

Publication Number Publication Date
WO2001048740A1 true WO2001048740A1 (fr) 2001-07-05

Family

ID=7934326

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/004630 Ceased WO2001048740A1 (fr) 1999-12-23 2000-12-22 Dispositif optique d'entrainement de donnees

Country Status (3)

Country Link
AU (1) AU3001801A (fr)
DE (2) DE19962758A1 (fr)
WO (1) WO2001048740A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8904187B2 (en) 2002-09-10 2014-12-02 Ivi Holdings Ltd. Secure biometric verification of identity

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100347760C (zh) * 2003-02-27 2007-11-07 皇家飞利浦电子股份有限公司 多叠层卷起式信息载体

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968842A (ja) * 1982-09-27 1984-04-18 Seiko Instr & Electronics Ltd 光学式情報記録・読み出し装置
US4525828A (en) * 1981-03-24 1985-06-25 Tokyo Shibaura Denki Kabushiki Kaisha Optical magnetic recording device
DE29816802U1 (de) * 1998-09-19 2000-02-10 Gerspach, Matthias, 69115 Heidelberg Optischer Datenspeicher

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2474221A1 (fr) * 1980-01-23 1981-07-24 Thomson Csf Dispositif optique d'enregistrement-lecture de supports d'information et systeme de memoire optique comportant un tel systeme
HU200023B (en) * 1986-02-07 1990-03-28 Inst Modelirovan Energet An Uk Optical store
JPH0281332A (ja) * 1988-09-19 1990-03-22 Hitachi Ltd 超小形光メモリ装置
US5592462A (en) * 1994-12-30 1997-01-07 Beldock; Donald T. Three-dimensional optical data storage and retrieval

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4525828A (en) * 1981-03-24 1985-06-25 Tokyo Shibaura Denki Kabushiki Kaisha Optical magnetic recording device
JPS5968842A (ja) * 1982-09-27 1984-04-18 Seiko Instr & Electronics Ltd 光学式情報記録・読み出し装置
DE29816802U1 (de) * 1998-09-19 2000-02-10 Gerspach, Matthias, 69115 Heidelberg Optischer Datenspeicher
WO2000017864A1 (fr) * 1998-09-19 2000-03-30 Beiersdorf Ag Memoire optique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 175 (P - 294) 11 August 1984 (1984-08-11) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8904187B2 (en) 2002-09-10 2014-12-02 Ivi Holdings Ltd. Secure biometric verification of identity

Also Published As

Publication number Publication date
AU3001801A (en) 2001-07-09
DE10084180D2 (de) 2003-02-20
DE19962758A1 (de) 2001-06-28

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