WO2002043057A2 - Device for the optical recording and reproduction of data - Google Patents

Device for the optical recording and reproduction of data Download PDF

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Publication number
WO2002043057A2
WO2002043057A2 PCT/DE2001/004428 DE0104428W WO0243057A2 WO 2002043057 A2 WO2002043057 A2 WO 2002043057A2 DE 0104428 W DE0104428 W DE 0104428W WO 0243057 A2 WO0243057 A2 WO 0243057A2
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WO
WIPO (PCT)
Prior art keywords
laser beam
data
deflection unit
deflection
spherical surface
Prior art date
Application number
PCT/DE2001/004428
Other languages
German (de)
French (fr)
Other versions
WO2002043057A3 (en
Inventor
Guido Sieber
Original Assignee
Fujitsu Siemens Computers 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 Fujitsu Siemens Computers Gmbh filed Critical Fujitsu Siemens Computers Gmbh
Publication of WO2002043057A2 publication Critical patent/WO2002043057A2/en
Publication of WO2002043057A3 publication Critical patent/WO2002043057A3/en

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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
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08547—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • 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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers

Definitions

  • the invention relates to a device for optically recording and / or reproducing data, comprising a data carrier which has a concave spherical surface (11) on the inside with an optically structurable reflection layer and an optical one
  • Such a device is e.g. EP 0 977193 A has also disclosed a recording device in which a laser beam can be pivoted by a deflection unit onto a concave spherical surface of a data carrier, the data carrier being rotatable relative to the optical device, so that the storage data are sequentially opened in concentric tracks the disk are written.
  • This requires a precise rotary drive, the axis of which must be exactly aligned with the central axis of the deflection unit and the center of the data carrier.
  • the present invention has for its object to improve a device for optical recording and playback of data in such a way that the scanning times are significantly reduced and thus the performance of such devices over a long period of time is significantly greater than in conventional systems.
  • the two-dimensional deflection unit means that there is no need for any other kinematic device. In particular, there is no wear-and-tear rotary drive with its problematic concentricity properties.
  • Deflection unit can have an electromagnetically actuated deflection mirror of very low mass, which can be adjusted very quickly, without disturbing the sensitive optics by vibrations.
  • the stationary assignment of the data carrier to the deflection unit makes it possible to adjust the two parts precisely to one another without any particular problems
  • the dome-shaped surface no longer needs to be divided into tracks to be described or scanned sequentially. Rather, the laser beam can be directed completely arbitrarily in the shortest possible time to any pixel-like memory locations of the reflection layer, as a result of which the writing and reading speed can be increased considerably.
  • the reflection layer can additionally be provided with markings distributed over the surface for precise adjustment of the laser beam.
  • the reflected optical signals can be directed precisely at a receiving diode, which converts them into electrical signals.
  • the laser beam can be constantly readjusted using the position markings.
  • the multiple coating according to claim 5 enables a corresponding multiplication of the storage capacity.
  • the figure shown shows a laser light source 1, a deflection unit 2, a data carrier 3 with a concave spherical surface facing the deflection unit 2 in the manner of a concave mirror.
  • At least one optically structurable polymeric reflective layer 4 is vapor-deposited on this surface, the molecular chains of which change their reflective properties under the influence of light.
  • a laser beam generated by the laser light source can be aligned by means of the deflection unit 2 in two deflection directions x and y to any storage locations of the reflection layer which it strikes perpendicularly. The signals reflected there are returned in the same way via the deflection unit in the direction of the laser light source.
  • the deflection unit takes place via an electromagnetically adjustable mirror.
  • the laser beam is deflected by means of a quartz or by using the Kerr effect.
  • the use of all nonlinear-optical effects which lead to a deflection or deflection of a laser beam is suitable for the deflection unit.
  • degenerate four-wave mixing is possible.
  • this is not the subject of the invention, which is why additional explanations are dispensed with and reference is made to the book A non Yariv: Quantum Electronics, publisher John Wiley & Sons, 3rd edition 1988 with regard to further design options for beam deflection.
  • the invention is not limited to one of the options mentioned, but closes other suitable devices for deflecting the laser beam.
  • An optical switch ⁇ in the form of an obliquely positioned semi-transparent mirror directs the reflected light to a beam splitter 7 from which it is guided to a position detector 8 and a data detector 9, in which the received optical signals are converted into electrical data signals.
  • the reflection layer can be changed either once or several times.
  • the device can be designed as a writing or reading device.
  • the device is designed as a combined read / write device.

Abstract

The device is provided with a data support (3), comprising an optically structurable reflection layer (4) on an inner surface of a concave spherical surface and an optical device with a laser light source (1) and a deflecting unit (2), arranged in the centre of the spherical surface, for the laser beam (5) which may be focussed on the surface. According to the invention, the data support (3) and the optical device are fixed within the device and the deflection unit (2) comprises defection means for the two-dimensional projection of the laser beam (5). The working speed and the functional security can thus be considerably increased.

Description

Beschreibungdescription
Vorrichtung zur optischen Aufzeichnung und Wiedergabe von DatenDevice for the optical recording and reproduction of data
Die vorliegende Erfindung betrifft eine Vorrichtung zur optischen Aufzeichnung und/oder Wiedergabe von Daten, mit einem Datenträger, der an einer Innenseite eine konkav sphärische Oberfläche (11) mit einer optisch strukturierbaren Reflexionsschicht aufweist und mit einer optischenThe invention relates to a device for optically recording and / or reproducing data, comprising a data carrier which has a concave spherical surface (11) on the inside with an optically structurable reflection layer and an optical one
Einrichtung, die eine Laserstrahlquelle und eine im Zentrum der sphärischen Oberfläche angeordnete Ablenkeinheit für den auf die Oberfläche fokussierbaren Laserstrahl aufweist.Device which has a laser beam source and a deflection unit arranged in the center of the spherical surface for the laser beam which can be focused on the surface.
Eine derartige Vorrichtung ist z.B. durch EP 0 977193 A ist ferner eine AufZeichnungsvorrichtung bekannt geworden, bei der ein Laserstrahl durch eine Ablenkeinheit schwenkbar auf eine konkave sphärische Oberfläche eines Datenträgers gerichtet werden kann, wobei der Datenträger relativ zur optischen Einrichtung drehbar ist, so daß die Speicherdaten in konzentrischen Spuren sequentiell auf den Datenträger geschrieben werden. Hierbei benötigt man einen präzisen Drehantrieb, dessen Achse exakt mit der Mittelachse der Ablenkeinheit und dem Mittelpunkt des Datenträgers fluchten muß .Such a device is e.g. EP 0 977193 A has also disclosed a recording device in which a laser beam can be pivoted by a deflection unit onto a concave spherical surface of a data carrier, the data carrier being rotatable relative to the optical device, so that the storage data are sequentially opened in concentric tracks the disk are written. This requires a precise rotary drive, the axis of which must be exactly aligned with the central axis of the deflection unit and the center of the data carrier.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zur optischen Aufzeichnung und zur Wiedergabe von Daten derart zu verbessern, daß die Abtastzeiten deutlich reduziert werden und somit die Leistungsfähigkeit derartiger Vorrichtungen über einen langen Zeitraum erheblich größer ist als bei herkömmlichen Systemen.The present invention has for its object to improve a device for optical recording and playback of data in such a way that the scanning times are significantly reduced and thus the performance of such devices over a long period of time is significantly greater than in conventional systems.
Diese Aufgabe wird durch die Erfindung gemäß Anspruch 1 gelöst. Durch die zweidimensionale Ablenkeinheit kann auf jede weitere kinematische Einrichtung verzichtet werden. Insbesondere entfällt der verschleißende Drehantrieb mit seinen problematischen Rundlaufeigenschaften. DieThis object is achieved by the invention according to claim 1. The two-dimensional deflection unit means that there is no need for any other kinematic device. In particular, there is no wear-and-tear rotary drive with its problematic concentricity properties. The
Ablenkeinheit kann einen elektromagnetisch betätigbaren Ablenkspiegel von sehr geringer Masse aufweisen, der sehr schnell feinstufig verstellt werden kann, ohne durch Erschütterungen die empfindliche Optik zu stören. Durch die stationäre Zuordnung des Datenträgers zur Ablenkeinheit ist es ohne besondere Probleme möglich, die beiden Teile genau zueinander zu justierenDeflection unit can have an electromagnetically actuated deflection mirror of very low mass, which can be adjusted very quickly, without disturbing the sensitive optics by vibrations. The stationary assignment of the data carrier to the deflection unit makes it possible to adjust the two parts precisely to one another without any particular problems
Die kalottenförmige Oberfläche braucht nun nicht mehr in sequentiell zu beschreibende bzw. abzutastende Spuren unterteilt zu werden. Der Laserstrahl kann vielmehr vollkommen wahlfrei in kürzester Zeit auf beliebige pixelartig verteilte Speicherstellen der Reflexionsschicht gerichtet werden, wodurch die Schreib- und Lesegeschwindigkeit erheblich erhöht werden kann. DieThe dome-shaped surface no longer needs to be divided into tracks to be described or scanned sequentially. Rather, the laser beam can be directed completely arbitrarily in the shortest possible time to any pixel-like memory locations of the reflection layer, as a result of which the writing and reading speed can be increased considerably. The
Reflexionsschicht kann zusätzlich mit über die Oberfläche verteilten Markierungen zur genauen Justierung des Laserstrahls versehen sein.The reflection layer can additionally be provided with markings distributed over the surface for precise adjustment of the laser beam.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet:Advantageous developments of the invention are characterized in the subclaims:
Durch die Vorrichtung nach Anspruch 2 können die reflektierten optischen Signale genau auf eine Empfangsdiode gerichtet werden, die diese in elektrische Signale umwandelt.By means of the device according to claim 2, the reflected optical signals can be directed precisely at a receiving diode, which converts them into electrical signals.
Durch den Lagedetektor und den Strahlenteiler nach Anspruch 3 und 4 kann der Laserstrahl anhand der Lagemarkierungen ständig nachjustiert werden. Die Mehrfachbeschichtung nach Anspruch 5 ermöglicht eine entsprechende Vervielfachung der Speicherkapazität.By the position detector and the beam splitter according to claim 3 and 4, the laser beam can be constantly readjusted using the position markings. The multiple coating according to claim 5 enables a corresponding multiplication of the storage capacity.
Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert:The invention is explained in more detail below on the basis of an exemplary embodiment shown in the drawing:
Die dargestellte Figur zeigt eine Laserlichtquelle 1, eine Ablenkeinheit 2, einen Datenträger 3 mit einer der Ablenkeinheit 2 zugewandten konkaven sphärischen Oberfläche in der Art eines Hohlspiegels. Auf dieser Oberfläche ist zumindest eine optisch strukturierbare polymere Reflexionsschicht 4 aufgedampft, deren Molekülketten unter Lichteinwirkung ihre Reflexionseigenschaften verändern. Ein durch die Laserlichtquelle erzeugter Laserstrahl ist mittels der Ablenkeinheit 2 in zwei Ablenkrichtungen x und y auf beliebige Speicherstellen der Reflexionsschicht ausrichtbar, auf die er senkrecht auftrifft. Die dort reflektierten Signale werden auf gleichem Wege über die Ablenkeinheit in Richtung der Laserlichtquelle zurückgeführt.The figure shown shows a laser light source 1, a deflection unit 2, a data carrier 3 with a concave spherical surface facing the deflection unit 2 in the manner of a concave mirror. At least one optically structurable polymeric reflective layer 4 is vapor-deposited on this surface, the molecular chains of which change their reflective properties under the influence of light. A laser beam generated by the laser light source can be aligned by means of the deflection unit 2 in two deflection directions x and y to any storage locations of the reflection layer which it strikes perpendicularly. The signals reflected there are returned in the same way via the deflection unit in the direction of the laser light source.
Für die Ausführung der Ablenkeinheit sind verschiedene Möglichkeiten gegeben. In einer möglichen Ausführung erfolgt die Ablenkung über einen elektromagnetisch verstellbaren Spiegel. In einer anderen Ausführung erfolgt die Ablenkung des Lasestrahls mittels eines Quarz oder unter Ausnutzung des Kerr-Effekts . Für die Ablenkeinheit ist grundsätzlich die Anwendung sämtlicher nichtlinear-optischen Effekte geeignet, die zu einer Umlenkung oder Ablenkung eines Laserstrahl führen. Beispielsweise ist entartetes Vier-Wellen-Mischen möglich. Dies ist jedoch nicht Gegenstand der Erfindung, weshalb auf zusätzliche Erläuterungen verzichtet und bezüglich weiterer Ausführungsmöglichkeiten der Strahlablenkung auf das Buch A non Yariv: Quantum Electronics, Verlag John Wiley & Sons, 3. Auflage 1988 verwiesen wird. Allerdings ist die Erfindung nicht auf eine der genannten Möglichkeiten beschränkt, sondern schließt andere geeignete Vorrichtungen zur Ablenkung des Laserstrahls ein.There are various options for the design of the deflection unit. In one possible embodiment, the deflection takes place via an electromagnetically adjustable mirror. In another embodiment, the laser beam is deflected by means of a quartz or by using the Kerr effect. In principle, the use of all nonlinear-optical effects which lead to a deflection or deflection of a laser beam is suitable for the deflection unit. For example, degenerate four-wave mixing is possible. However, this is not the subject of the invention, which is why additional explanations are dispensed with and reference is made to the book A non Yariv: Quantum Electronics, publisher John Wiley & Sons, 3rd edition 1988 with regard to further design options for beam deflection. However, the invention is not limited to one of the options mentioned, but closes other suitable devices for deflecting the laser beam.
Eine optische Weiche β in Form eines schräg gestellten halb durchlässigen Spiegels lenkt das reflektierte Licht zu einem Strahlenteiler 7 von dem aus dieses zu einem Lagedetektor 8 und einem Datendetektor 9 geführt ist, in dem die empfangenen optischen Signale in elektrische Datensignale umgewandelt werden.An optical switch β in the form of an obliquely positioned semi-transparent mirror directs the reflected light to a beam splitter 7 from which it is guided to a position detector 8 and a data detector 9, in which the received optical signals are converted into electrical data signals.
Die Reflexionsschicht kann entweder einmal oder mehrfach veränderbar sein. Beim einmaligen Beschreiben kann die Vorrichtung als Schreib- oder Leseeinrichtung ausgebildet sein. Für wiederholtes Überschreiben der Reflexionsschicht ist die Vorrichtung als kombinierte Schreib-Leseeinrichtung ausgebildet . The reflection layer can be changed either once or several times. When writing once, the device can be designed as a writing or reading device. For repeated overwriting of the reflection layer, the device is designed as a combined read / write device.

Claims

Patentansprüche claims
1. Vorrichtung zur optischen Aufzeichnung und/oder Wiedergabe von Daten, mit einem Datenträger (3) , der an einer Innenseite eine konkav sphärische Oberfläche mit einer optisch strukturierbaren Reflexionsschicht (4) aufweist und mit einer optischen Einrichtung, die eine Laserstrahlquelle (1) und eine im Zentrum der sphärischen Oberfläche angeordnete Ablenkeinheit (2) für den auf die Oberfläche fokussierbaren Laserstrahl (5) aufweist, dadurch gekennzeichnet, daß der Datenträger (3) und die optische Einrichtung in der Vorrichtung stationär gelagert sind und daß die Ablenkeinheit (2) Ablenkmittel zur zweidimensionalen Auslenkung des Laserstrahls (5) aufweist.1. Device for optical recording and / or playback of data, with a data carrier (3) which has a concave spherical surface on the inside with an optically structurable reflection layer (4) and with an optical device which has a laser beam source (1) and has a deflection unit (2) arranged in the center of the spherical surface for the laser beam (5) which can be focused on the surface, characterized in that the data carrier (3) and the optical device are mounted in a stationary manner in the device and that the deflection unit (2) deflection means for two-dimensional deflection of the laser beam (5).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß zwischen der Laserstrahlquelle (1) und der Ablenkeinheit (2) eine optische Weiche (6) zur Auskopplung des von der Reflexionsschicht (4) reflektierten Laserlichts angeordnet ist und daß das ausgekoppelte Reflexionslicht auf einen Datendetektor (9) gelenkt ist.2. Apparatus according to claim 1, characterized in that between the laser beam source (1) and the deflection unit (2) an optical switch (6) for coupling out the laser light reflected by the reflection layer (4) is arranged and that the coupled-out reflection light on a data detector (9) is steered.
3. Vorrichtung nach Anspruch I oder 2, dadurch gekennzeichnet, daß das Reflexionslicht auf einen Lagedetektor (8) gerichtet ist.3. Apparatus according to claim I or 2, characterized in that the reflection light is directed to a position detector (8).
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das ausgekoppelte Reflexionslicht über einen Strahlenteiler (7) zum Datendetektor (9) und zum Lagedetektor (8) geführt ist.4. The device according to claim 3, characterized in that the coupled-out reflection light is guided via a beam splitter (7) to the data detector (9) and to the position detector (8).
5. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß auf der Oberfläche des Datenträgers (3) mehrere Reflexionsschichten (4) übereinander angeordnet sind. 5. Device according to one of the preceding claims, characterized in that on the surface of the data carrier (3) a plurality of reflection layers (4) are arranged one above the other.
PCT/DE2001/004428 2000-11-25 2001-11-23 Device for the optical recording and reproduction of data WO2002043057A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10058711.9 2000-11-25
DE2000158711 DE10058711A1 (en) 2000-11-25 2000-11-25 Device for the optical recording and reproduction of data

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WO2002043057A2 true WO2002043057A2 (en) 2002-05-30
WO2002043057A3 WO2002043057A3 (en) 2003-05-08

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4995025A (en) * 1986-10-06 1991-02-19 Schulze Dieter M Spherical pivoting actuator for read/record head
WO1993023849A1 (en) * 1992-05-15 1993-11-25 Samsung Electronics Co., Ltd. Device for imparting curvature across the width of an optical recording medium
US5425016A (en) * 1994-02-28 1995-06-13 Sutker; Hal Digital laser encoder/recorder/player, utilizing ellipsoidal memory medium
US5506398A (en) * 1994-07-08 1996-04-09 Fujitsu Limited Optical data recording and reproducing apparatus and method employing an optical head at the center of a spherical recording medium
EP0977193A1 (en) * 1998-07-30 2000-02-02 Guido Sieber Optical data recording and reproducing apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4995025A (en) * 1986-10-06 1991-02-19 Schulze Dieter M Spherical pivoting actuator for read/record head
WO1993023849A1 (en) * 1992-05-15 1993-11-25 Samsung Electronics Co., Ltd. Device for imparting curvature across the width of an optical recording medium
US5425016A (en) * 1994-02-28 1995-06-13 Sutker; Hal Digital laser encoder/recorder/player, utilizing ellipsoidal memory medium
US5506398A (en) * 1994-07-08 1996-04-09 Fujitsu Limited Optical data recording and reproducing apparatus and method employing an optical head at the center of a spherical recording medium
EP0977193A1 (en) * 1998-07-30 2000-02-02 Guido Sieber Optical data recording and reproducing apparatus

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WO2002043057A3 (en) 2003-05-08
DE10058711A1 (en) 2002-08-08

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