DE2616362A1 - Magnetic disc servo track production - with servo track produced on disc surface by focussed and modulated laser beam - Google Patents

Magnetic disc servo track production - with servo track produced on disc surface by focussed and modulated laser beam

Info

Publication number
DE2616362A1
DE2616362A1 DE19762616362 DE2616362A DE2616362A1 DE 2616362 A1 DE2616362 A1 DE 2616362A1 DE 19762616362 DE19762616362 DE 19762616362 DE 2616362 A DE2616362 A DE 2616362A DE 2616362 A1 DE2616362 A1 DE 2616362A1
Authority
DE
Germany
Prior art keywords
servo track
disc
focussed
laser beam
magnetic
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.)
Pending
Application number
DE19762616362
Other languages
German (de)
Inventor
Johann Ing Grad Krueger
G L Walther
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.)
Philips Intellectual Property and Standards GmbH
Original Assignee
Philips Patentverwaltung 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 Philips Patentverwaltung GmbH filed Critical Philips Patentverwaltung GmbH
Priority to DE19762616362 priority Critical patent/DE2616362A1/en
Publication of DE2616362A1 publication Critical patent/DE2616362A1/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
    • G11B13/04—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/30—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture with provision for auxiliary signals
    • G11B23/34—Signal means additional to the main recording track, e.g. photoelectric sensing of sprocket holes for timing

Abstract

A focussed laser signal is used to produce a servo track on magnetic disc or drum. A magnetic disc (1) is mounted on a spindle (3) that also carries a conventional disc (4) with a pick-up (5) providing signals to a control unit (9). the disc is driven by a motor (2) and a coupled pulse generator (6) outputs control signals. The required servo track is burned on the disc by modulating (7) a laser beam that is focussed (8) onto the surface. The focussing may be produced by electromagnetic or piezo-electric devices. The process is synchronised by signals from the pulse generator via the control unit (9, 10).

Description

Vorrichtung zum Herstellen optisch lesbarer ServospurenDevice for producing optically readable servo tracks

in der Magnetspeicherschicht von Datenträgern" Die Erfindung bezieht sich auf eine Vorrichtung zum Herstellen optisch lesbarer Servospuren in der Magnetspeicherschicht von Datenträgern.in the magnetic storage layer of data carriers "The invention relates relies on a device for creating optically readable servo tracks in the magnetic storage layer of data carriers.

Es ist bekannt, daß mit einem fokussierten Laserstrahl Material verdampft werden kann und daß auf diese Weise in dünne Schichten Information geschrieben werden kann. Es sind auch Verfahren bekannt, bei denen zum Zweck optischer Datenspeicherung mit einem Laserstrahl Löcher oder Striche in eine rotierende Platte geschrieben oder gebrannt werden können.It is known that a focused laser beam vaporizes material and that in this way information is written in thin layers can. There are also known methods in which for the purpose of optical Data storage Holes or lines are written in a rotating plate with a laser beam or can be burned.

Aufgabe der Erfindung ist es, magnetische Datenträger, wie z.B. Magnetplatte, Magnettrommel oder Magnetband, mit optisch lesbaren Servospuren und Spurkennungen zu versehen.The object of the invention is to produce magnetic data carriers, such as magnetic disks, Magnetic drum or magnetic tape, with optically readable servo tracks and track identifiers to provide.

Gelöst wird diese Aufgabe dadurch, daß ein in Abhängigkeit von vorgegebenen Steuer- und Regelsignalen verschiebbarer, modulierbarer fokussierter Laserlichtstrahl über die Magnetspeicherschicht geführt wird und die gewünschten Servospuren einschreibt.This object is achieved in that a depending on predetermined Control and regulation signals shiftable, modulatable focused laser light beam is passed over the magnetic storage layer and writes the desired servo tracks.

Die Servospuren können auch nachtrng:lich in handelsübliche, gegebenenfalls schon mit Datenspuren versehene Datenträger eingeschrieben werden. Die Servospuren belegen keine zusätzliche Spcicherfläche, da sie in den ohnehin erforderlichen Zwischenraum zwischen zwei magnetischen Datenspuren eingebrannt werden. Die Lage der Datenspuren ist dadurch unlöschbar fixiert.The servo tracks can also be converted into commercially available, if necessary Data carriers already provided with data tracks can be written. The servo tracks do not occupy any additional storage space, as they are in the space that is required anyway burned in between two magnetic data tracks. The location of the data tracks is thus permanently fixed.

Da die Servospuren in einem von der Herstellung des Datenträgers (Speicherplatte) separaten und flexiblen Verfahren erzeugt werden, ist es ohne weiteres möglich, diese auch für Anwendungen geringeren Volumens individuellen Bedurfnissen anzupassen.Since the servo tracks are in one of the manufacture of the data carrier (storage disk) separate and flexible processes are generated, it is easily possible to adapting these to individual requirements for applications with smaller volumes.

Die Zeichnung stellt ein Ausführungsbeispiel dar. Der zu bearbeitende Datenträger,im Ausführungsbeispiel eine rotierende Magnetplatte 1, wird auf eine durch einen regelbaren Motor 2 angetriebene Spindel 3 montiert. Die Spindel trägt außerdem eine Referenz-Magnetplatte 4, von der während des Bearbeitungsvorganges auf konventionelle Weise mit einem Schreib-Lesekopf 5 Taktsignale abgenommen werden können. Weiterhin ist die Spindel 3 mit einem optischen Winkelschrittgeber 6 verbunden, der zusätzliche Taktsignale liefert.The drawing shows an exemplary embodiment. The one to be processed Data carrier, in the exemplary embodiment a rotating magnetic disk 1, is on a Mounted by a controllable motor 2 driven spindle 3. The spindle carries also a reference magnetic disk 4, of which during the machining process 5 clock signals can be picked up in a conventional manner with a read / write head can. Furthermore, the spindle 3 is connected to an optical encoder 6, which supplies additional clock signals.

Der zum Einbrennen der Servospuren benutzte Laserstrahl La durchläuft einen elektrooptischen oder akustooptischen Modulator 7, z.B. einen elektronisch gesteuerten Lichtverschluß oder einen digitalen Lichtablenker, bei dem in der einen Ablenkrichtung die Energie des Laserstrahls stark vermindert wird, und wird mit weiteren optischen Mitteln, z.B. einem Linsensystem 8 auf die Oberfläche der Platte 1 fokussiert, und zwar so, daß der Fokus F in radialer Richtung schrittweise oder kontinuierlich über den zu bearbeitenden Bereich der Magnetspeicherplatte verschoben werden kann.The laser beam La used to burn in the servo tracks passes through an electro-optic or acousto-optic modulator 7, e.g. an electronic one controlled light shutter or a digital light deflector, in which one Deflection direction the energy of the laser beam is greatly reduced, and is with further optical means, e.g. a lens system 8 on the surface of the plate 1 focused, in such a way that the focus F stepwise or in the radial direction shifted continuously over the area of the magnetic storage disk to be processed can be.

Mit Hilfe einer programmierbaren Zähl- und Steuerelektronik 9, 10, die durch die Taktsignale synchronisiert wird, wird einerseits der Modulator 7 angesteuert und andererseits der Fokus F z.B. schrittweise verschoben. Diese Verschiebung der Fokussieroptik 8 kann mit elektromagnetischen oder piezoelektrischen Mitteln erfolgen. Auf diese Weise können in der Magnetschicht der Magnetspeicherplatte 1 Löcher, Striche und/oder Linien erzeugt werden, die die gewünschten optisch lesbaren Servospuren darstellen.With the help of a programmable counting and control electronics 9, 10, which is synchronized by the clock signals, the modulator 7 is controlled on the one hand and on the other hand, the focus F is shifted stepwise, for example. This shift of the Focusing optics 8 can be made with electromagnetic or piezoelectric means. In this way, in the magnetic layer the magnetic storage disk 1 Holes, dashes and / or lines can be generated that are the desired optically readable Represent servo tracks.

PATENTANSPRÜCHE: L e e r s e i t e PATENT CLAIMS: L e r s e i t e

Claims (3)

PATENTANSPRÜCHE: Vorrichtung zum Herstellen von optisch lesbaren Servospuren in der Magnetspeicherschicht von Butenträgern, dadurch gekennzeichnet, daß ein in Abhängigkeit von vorgegebenen Steuer- und Regelsignalen verschiebbarer, modulierbarer fokussierter Laserlichtstrahl über die Magnetspeicherschicht geführt wird und die gewünschten Servospuren einschreibt.PATENT CLAIMS: Device for producing optically readable servo tracks in the magnetic storage layer of bute carriers, characterized in that an in Depending on the given control and regulation signals, it can be shifted and modulated focused laser light beam is guided over the magnetic storage layer and the the desired servo tracks. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß bei rotierender Magnetspeicherschicht des Datenträgers, z.B einer Magnetplatte, eine konzentrisch dazu drehbare Referenzschicht vorgesehen ist, von der eine Taktfrequenz für die Steuer- und Regelsignale des Modtslators und der Führung des Laserlichtstrahls abgeleitet wird. 2. Apparatus according to claim 1, characterized in that when rotating Magnetic storage layer of the data carrier, e.g. a magnetic disk, one concentric rotatable reference layer is provided, of which a clock frequency for the Control signals of the modulator and the guidance of the laser light beam derived will. 3. Vorrichtung nach Anspruch 1 und 2, dadurc'n gekennzeichnet, daß mit der rotierenden Speicb.erplatte ein Winkelschrittgeber gekuppelt ist, von den ebenfalls Taktsignale für die Zähl- und Steuerelektronjk abgeleitet werden.3. Apparatus according to claim 1 and 2, dadurc'n characterized in that with the rotating Speicb.erplatte an angular incremental encoder is coupled, of the clock signals for the counting and control electronics can also be derived.
DE19762616362 1976-04-14 1976-04-14 Magnetic disc servo track production - with servo track produced on disc surface by focussed and modulated laser beam Pending DE2616362A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19762616362 DE2616362A1 (en) 1976-04-14 1976-04-14 Magnetic disc servo track production - with servo track produced on disc surface by focussed and modulated laser beam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762616362 DE2616362A1 (en) 1976-04-14 1976-04-14 Magnetic disc servo track production - with servo track produced on disc surface by focussed and modulated laser beam

Publications (1)

Publication Number Publication Date
DE2616362A1 true DE2616362A1 (en) 1977-11-03

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DE19762616362 Pending DE2616362A1 (en) 1976-04-14 1976-04-14 Magnetic disc servo track production - with servo track produced on disc surface by focussed and modulated laser beam

Country Status (1)

Country Link
DE (1) DE2616362A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0344759A2 (en) * 1988-06-03 1989-12-06 Insite Peripherals, Inc. High track density media with optical servo tracks and method and apparatus for inscribing the tracks on the media
EP0417158A1 (en) * 1988-06-02 1991-03-20 Newell Research Corporation Method for writing and means for reading position-indicating markers on tape
US5501944A (en) * 1993-12-17 1996-03-26 Minnesota Mining And Manufacturing Company Ablative imaging by proximity lithography
US5757016A (en) * 1993-12-17 1998-05-26 Minnesota Mining And Manufacturing Company Ablative flashlamp imaging
US6558774B1 (en) 1999-08-17 2003-05-06 Quantum Corporation Multiple-layer backcoating for magnetic tape
US6741415B1 (en) 1999-02-16 2004-05-25 Quantum Corporation Method of writing servo signal on magnetic tape
US6768608B2 (en) 1998-03-24 2004-07-27 Quantum Corporation Multi-channel magnetic tape system having optical tracking servo
US6771450B1 (en) 1999-02-17 2004-08-03 Quantum Corporation Method of writing servo signal on magnetic tape

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0417158A1 (en) * 1988-06-02 1991-03-20 Newell Research Corporation Method for writing and means for reading position-indicating markers on tape
EP0417158A4 (en) * 1988-06-02 1992-03-04 Newell Research Corporation Method for writing and means for reading position-indicating markers on tape
EP0344759A2 (en) * 1988-06-03 1989-12-06 Insite Peripherals, Inc. High track density media with optical servo tracks and method and apparatus for inscribing the tracks on the media
EP0344759A3 (en) * 1988-06-03 1991-01-09 Insite Peripherals, Inc. High track density media with optical servo tracks and method and apparatus for inscribing the tracks on the media
US5501944A (en) * 1993-12-17 1996-03-26 Minnesota Mining And Manufacturing Company Ablative imaging by proximity lithography
US5633123A (en) * 1993-12-17 1997-05-27 Minnesota Mining And Manufacturing Company System for ablative imaging by proximity lithography
US5757016A (en) * 1993-12-17 1998-05-26 Minnesota Mining And Manufacturing Company Ablative flashlamp imaging
US6768608B2 (en) 1998-03-24 2004-07-27 Quantum Corporation Multi-channel magnetic tape system having optical tracking servo
US6741415B1 (en) 1999-02-16 2004-05-25 Quantum Corporation Method of writing servo signal on magnetic tape
US6771450B1 (en) 1999-02-17 2004-08-03 Quantum Corporation Method of writing servo signal on magnetic tape
US6558774B1 (en) 1999-08-17 2003-05-06 Quantum Corporation Multiple-layer backcoating for magnetic tape

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