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WO1992005549A1 - Magnetic tape - Google Patents

Magnetic tape Download PDF

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Publication number
WO1992005549A1
WO1992005549A1 PCT/EP1991/001759 EP9101759W WO9205549A1 WO 1992005549 A1 WO1992005549 A1 WO 1992005549A1 EP 9101759 W EP9101759 W EP 9101759W WO 9205549 A1 WO9205549 A1 WO 9205549A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic tape
tape
strips
information
transparent
Prior art date
Application number
PCT/EP1991/001759
Other languages
German (de)
French (fr)
Inventor
Ingolf Brauner
Original Assignee
Gigatape Systeme Für Datensicherung 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 Gigatape Systeme Für Datensicherung Gmbh filed Critical Gigatape Systeme Für Datensicherung Gmbh
Publication of WO1992005549A1 publication Critical patent/WO1992005549A1/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/05—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
    • G11B15/06—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing auxiliary features on record carriers or containers, e.g. to stop machine near the end of a tape
    • G11B15/08—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing auxiliary features on record carriers or containers, e.g. to stop machine near the end of a tape by photoelectric sensing
    • 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
    • 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
    • G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
    • G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/24—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
    • G11B27/26—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording by photoelectric detection, e.g. of sprocket holes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/90—Tape-like record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/90—Tape-like record carriers
    • G11B2220/91—Helical scan format, wherein tracks are slightly tilted with respect to tape direction, e.g. VHS, DAT, DVC, AIT or exabyte
    • G11B2220/913—Digital audio tape [DAT] format

Definitions

  • the invention relates to a magnetic tape of the type specified in the preamble of claim 1.
  • Such tapes are in the most varied variants, for example as audio, video and computer data tapes in circulation and are either assembled on open spools or in cassettes.
  • the so-called compact cassettes are one of the most widely used data carriers and are used both for recording analog data, such as music, and for recording digital data.
  • a relatively young data carrier, the so-called DAT cassette is used exclusively for recording digital data, and is currently the most compact data carrier based on magnetic tapes.
  • Magnetic tapes are commercially available in a wide variety of lengths and continue to differ, among other things, in the tape material used, especially in the coating material used for recording.
  • the decisive factor for the recording quality is the premagnetization that depends on the coating material during recording.
  • recesses for identification of the tape type are provided on the back of the compact cassette, which are mechanically scanned by recording devices.
  • holes are formed on the bottom of the housing, which are also mechanically scanned by the recording device and u. a. Includes information about the tape length. Mechanical scanning is extremely complex because of the precision mechanics required for this. The number of mechanically scannable information is naturally only available for a very limited amount of information.
  • Magnetic tapes wound on open spools are not suitable for mechanical marking of tape parameters due to the lack of a fixed spool housing during recording.
  • the invention has for its object to provide a magnetic tape of the type mentioned, which can be identified in terms of its parameters in a simple manner and can be easily provided with further information in addition to the useful data without adversely affecting the latter.
  • the invention consists in creating a marking area on the tape which is independent of the area for recording the useful data and which can be read out optically.
  • Such an optical marking in no way influences the spatially separate and technically different recording and reproduction of the electromagnetic useful data.
  • the optical marking allows almost any storage of additional data or additional information relating to tape parameters and other data related to the useful information.
  • one advantage of accommodating information about tape parameters, such as tape type and type of coating is that complex and susceptible mechanical scanning mechanisms can be dispensed with. Since recording and recording devices for tape cassettes generally have optoelectronic detectors for detecting the end of the tape and the beginning of the tape, these existing detectors can also advantageously be used to evaluate the optical tape information provided according to the invention.
  • the invention provides the advantage that information about tape parameters can now be made available at all and permanently.
  • Another advantage over the electromagnetic recording of information supplementing useful data, in the form of the tape according to the invention, is that this additional information is present in a different type of recording independently of useful signals and therefore does not need to be interpreted by additional evaluation electronics.
  • any pattern forms are suitable as a pattern for the optically readable marking area provided according to the invention for additional information about the tape or for information in connection with the tape.
  • the use of a sequence of translucent and opaque strips on the transparent band area is particularly advantageous. These strips, which are preferably arranged transversely, namely essentially vertically to the tape running direction, can be used to encrypt a variety zahi different additional information can be arranged in different widths and distances, so that, for example, when reading the optical information per unit of time there are corresponding variations alternating transparent / non-transparent.
  • a wide variety of techniques are suitable for producing the marking according to the invention, such as, for example, splicing, pasting, or printing on the transparent tape area or applying a correspondingly patterned decal.
  • the marking area according to the invention is provided at the beginning or end of the tape, and the transparent leading and trailing tapes of the invention which may already be present can also be marked accordingly.
  • the marking according to the invention is also advantageously suitable for marking special tape areas, such as for example marking a measuring area (in particular for audio applications), a reference area or a cleaning area (with cleaning tape).
  • the marking according to the invention can also contain information that is of interest for research and development or the service of tape devices, such as for example determining the current tape speed by measuring the time between two marking strips. These markings are also useful for identifying certain tapes according to their content, such as a test tape.
  • the invention provides the advantage of increased protection against misuse by introducing a serial number or a password or keyword.
  • Keyable information relates to information about the length of the tape (which means that there is no need to completely wind through to determine the length), about the tape material (especially the Vegas coating), about the maximum recording density, about the manufacturer and the serial number and the like.
  • the strip section 1 shown consists of transparent material and carries a plurality of optically readable markings in the form of strips 2, 3, 4 and 5. These strips run vertically to the longitudinal direction of the strip and, due to their shape and arrangement, provide an additional one to the magnetically coated strip area Information carrier.
  • the three strips 2, 3 and 5 have the same 3 rider and are narrower than a strip 4 arranged between the strips 3 and 5.
  • the distance between the two narrow strips 2 and 3 is less than the distance between the further narrow strip 5 and the wide one Stripe 4 and greater than the distance between the narrow stripe 3 and the wide stripe 4.
  • the strips can be applied to the transparent support in a wide variety of ways. Printing on the transparent substrate is particularly suitable for mass production. A blackening for the strips is preferred in favor of an at least 95% light-dark transition.

Landscapes

  • Magnetic Record Carriers (AREA)

Abstract

A magnetic tape for electromagnetically storing data has a transparent section (1) provided with marks that form optically readable information. This information can relate to parameters of the magnetic tape or can constitute additional information related to the tape. Preferably, the marks are shaped as bands (2, 3, 4, 5) opaque to light that extend transversely to the longitudinal direction of the transparent section (1) of the tape and can have various widths or spacings. In the case of a DAT-cassette, the mechanically scannable tape information that was until now provided on the cassette housing can be alternatively stored on the transparent section (1) of the tape and/or be supplemented by any desired amount of additional information.

Description

M a g n e t b a n d  M a g n e t b a n d
Die Erfindung betrifft ein Magnetband der im Oberbegriff des Anspruchs 1 angegebenen Art. The invention relates to a magnetic tape of the type specified in the preamble of claim 1.
Derartige Bänder sind in den unterschiedlichsten Varianten, beispielsweise als Audio-, Video- und Ccmputerdatanbänder im Umlauf und werden entweder auf offenen Spulen oder in Kassetten konfektioniert. Dia sogenannten Compact-Cassetten sind einer der am stärksten verbreiteten Datenträger überhaupt, und dienen sowohl zur Aufzeichnung analoger Daten, wie etwa Musik, als auch zur Aufzeichnung digitaler Daten. Ausschließlich zur Äufzeichung digitaler Daten dient ein relativ junger Datenträger, die sogenannte DAT-Cassette, welche zur Zeit den kompaktesten Datenträger auf der Grundlage von Magnetbändern darstellt. Such tapes are in the most varied variants, for example as audio, video and computer data tapes in circulation and are either assembled on open spools or in cassettes. The so-called compact cassettes are one of the most widely used data carriers and are used both for recording analog data, such as music, and for recording digital data. A relatively young data carrier, the so-called DAT cassette, is used exclusively for recording digital data, and is currently the most compact data carrier based on magnetic tapes.
Magnetbänder befinden sich in den unterschiedlichsten Längen im Handel und unterscheiden sich weiterhin unter anderem in dem verwendeten Bandmaterial vor allem in dem zur Aufzeichnung dienenden Beschichtungsmaterial. Bei Compact-Cassetten, die in erster Linie zur analogen Datenaufzeichnung vorgesehen sind, kommt es für die AufZeichnungsqualität entscheidend auf die vom Beschichtungsmaterial abhängige Vormagnetisierung während der Aufzeichnung an. Aus diesem Grunde sind auf dem Gehäuserücken von Compactcassetten Ausnehmungen zur Identifikation des Bandtyps vorgesehen, die von AufZeichnungsgeräten mechanisch abgetastet werden. Bei DAT-Cassetten sind am Gehäuseboden Löcher ausgebildet , die von Aufzeichnungsgerätan ebenfalls mechanisch abgetastet werden und u. a . Informationen über die Bandlänge enthalten. Eine mechanische Abtastung ist wegen der dazu notwendigen Präzisionsmechanik ausgesprochen aufwendig. Die Anzahl mechanisch abtastbarer Informationen steht außerdem naturgemäß nur für eine sehr begrenzte Informationsmenge zur Verfügung . Magnetic tapes are commercially available in a wide variety of lengths and continue to differ, among other things, in the tape material used, especially in the coating material used for recording. With compact cassettes, which are primarily intended for analog data recording, the decisive factor for the recording quality is the premagnetization that depends on the coating material during recording. For this reason, recesses for identification of the tape type are provided on the back of the compact cassette, which are mechanically scanned by recording devices. In the case of DAT cassettes, holes are formed on the bottom of the housing, which are also mechanically scanned by the recording device and u. a. Includes information about the tape length. Mechanical scanning is extremely complex because of the precision mechanics required for this. The number of mechanically scannable information is naturally only available for a very limited amount of information.
Auf off ene Spulen gewickelte Magnetbänder eignen sich mangels eines bei der Aufzeichnung feststehenden Spulenaufnahmegehäu- ses nicht zur mechanischen Markierung von Bandparametern . Für diese 3änder ist es jedoch beispielsweise bekannt , zugunsten weiterer Informationen neben den Nutzdatan Trägerdaten mit aufzuzeichnen , die bei der Wiedergabe von einer speziellen Aus werteelektronik erkannt werden. Magnetic tapes wound on open spools are not suitable for mechanical marking of tape parameters due to the lack of a fixed spool housing during recording. For these 3 countries, however, it is known, for example, to also record carrier data in addition to the useful data in favor of further information, which are recognized by special evaluation electronics during playback.
Die gemeinsame elektromagnetische Aufzeichnung von Nutzdatan und Zusatzinformationen erfordert ein aufwendiges Herausfiltern der Zusatzinformation, welche ungünstigenf alls außerdem die Nutzdatan ungünstig beeinflussen . The common electromagnetic recording of useful data and additional information requires an elaborate filtering out of the additional information, which disadvantageously also unfavorably influences the useful data.
Der Erfindung liegt die Aufgabe zugrunde , ein Magnetband der eingangs genannten Art zu schaffen, das bezüglich seiner Parameter auf einfache Weise identifizierbar und auf einfache Weise mit weiterer Information zusätzlich zu den Nutzdaten versehbar ist , ohne letztere ungünstig zu beeinflussen. The invention has for its object to provide a magnetic tape of the type mentioned, which can be identified in terms of its parameters in a simple manner and can be easily provided with further information in addition to the useful data without adversely affecting the latter.
Gelöst wird diese Aufgabe durch dia kennzeichnenden Merkmale des Anspruchs 1. This object is achieved by the characterizing features of claim 1.
Demnach besteht die Erfindung in der Schaffung eines von dem Bereich zur Aufzeichnung der Nutzdatan unabhängigen Markierungsbereich auf dem Band, der optisch auslesbar ist . Eine derartige optische Markierung beinflußt in keinster Weise die räumlich hiervon getrennte und technisch andersartige Aufzeichnung und Wiedergabe der elektromagnetischen Nutzdaten. Außerdem gestattet die optische Markierung nahezu eine beliebige Abspeicherung von Zusatzdaten bzw. Zusatzinformation betreffend Bandparameter und sonstige im Zusammenfang mit der Nutzinformation stehenden Daten. Accordingly, the invention consists in creating a marking area on the tape which is independent of the area for recording the useful data and which can be read out optically. Such an optical marking in no way influences the spatially separate and technically different recording and reproduction of the electromagnetic useful data. In addition, the optical marking allows almost any storage of additional data or additional information relating to tape parameters and other data related to the useful information.
Im Zusammenhang mit in Kassetten konfektioniertem Bandmaterial besteht ein Vorteil der Unterbringung von Informationen über Bandparameter, wie Bandart und Beschichtungsart darin, daß aufwendige und anfällige mechanische Abtastmechanismen entfallen können. Da Aufzeichnungs- und Wiadargabegeräte für Bandkassetten in der Regel optoelektronische Detektoren zur Erfassung des 3andendes und des Bandanfangs aufweisen, können diese bereits vorhandenen Detektoren in vorteilhafter Weise auch zur Auswertung der erfindungsgemäß vorgesehenen optischen Bandinformationen dienen. In connection with tape material assembled in cassettes, one advantage of accommodating information about tape parameters, such as tape type and type of coating, is that complex and susceptible mechanical scanning mechanisms can be dispensed with. Since recording and recording devices for tape cassettes generally have optoelectronic detectors for detecting the end of the tape and the beginning of the tape, these existing detectors can also advantageously be used to evaluate the optical tape information provided according to the invention.
Für auf offenen Spulen konfektionierte Magnetbänder erbringt die Erfindung den Vorteil, daß Informationen über Bandparameter nunmehr überhaupt und dauerhaft zur Verfügung gestellt werden können. For magnetic tapes assembled on open reels, the invention provides the advantage that information about tape parameters can now be made available at all and permanently.
Ein weiterer Vorteil gegenüber der elektromagnetischen Aufzeichnung von Nutzdaten ergänzenden Informationen besteht in Gestalt des erfindungsgemäßen Bandes darin, daß diese Zusatzinformationen unabhängig von Nutzsignalen in einer anderen Aufzeichnungsart vorliegen und deshalb nicht der Interpretation durch eine zusätztliche Auswerteelektronik bedürfen. Another advantage over the electromagnetic recording of information supplementing useful data, in the form of the tape according to the invention, is that this additional information is present in a different type of recording independently of useful signals and therefore does not need to be interpreted by additional evaluation electronics.
Als Muster für den erfindungsgemäß vorgesehenen optisch auslesbaren Markierungsbereich für zusätzliche Informationen über das Band bzw. für Informationen im Zusammenhang mit dem Band eignen sich grundsätzlich nahezu beliebige Musterformen. Wegen seiner Einfachheit besonders vorteilhaft ist die Verwendung einer Abfolge lichtdurchlässiger und lichtundurchlässiger Streifen auf dem transparenten Bandbereich. Diese vorzugsweise quer, nämlich im wesentlichen vertikal zur Bandlaufrichtung angeordneten Streifen können zur Verschlüsselung einer Viel¬ zahi unterschiedlicher Zusatzinformation in unterschiedlichen Breiten und Abständen angeordnet sein, so daß sich beispielsweise beim Auslesen der optischen Information pro Zeiteinheiten entsprechende Variationen im Wechsel transparent/nicht- transparant ergeben. Basically almost any pattern forms are suitable as a pattern for the optically readable marking area provided according to the invention for additional information about the tape or for information in connection with the tape. Because of its simplicity, the use of a sequence of translucent and opaque strips on the transparent band area is particularly advantageous. These strips, which are preferably arranged transversely, namely essentially vertically to the tape running direction, can be used to encrypt a variety zahi different additional information can be arranged in different widths and distances, so that, for example, when reading the optical information per unit of time there are corresponding variations alternating transparent / non-transparent.
Zur Herstellung der erfindungsgemäßen Markierung eignen sich die unterschiedlichsten Techniken, wie beispielsweise das Spleißen, Bekleben, oder Bedrucken des transparenten Bandbereichs oder das Aufbringen eines entsprechend gemusterten Abziehbilds. A wide variety of techniques are suitable for producing the marking according to the invention, such as, for example, splicing, pasting, or printing on the transparent tape area or applying a correspondingly patterned decal.
Vorteilhafterweise ist der erfindungsgemäße Markierungsbereich am 3andanfang oder am Bandende vorgesehen, wobei auch die gegebenenfalls bereits vorhandenen transparenten Vor- und Nachlaufbänder der Erfindung entsprechend markiert sein können. Advantageously, the marking area according to the invention is provided at the beginning or end of the tape, and the transparent leading and trailing tapes of the invention which may already be present can also be marked accordingly.
Die erfindungsgemäße Markierung eignet sich aber auch vorteilhafterweise zur Markierung von speziellen Bandbereichen, wie beispielsweise zur Markierung eines Einmeßbereichs (insbesondere bei Audioanwendung), eines Referenzbereichs oder eines Reinigungsbereichs (mit Reinigungsband). However, the marking according to the invention is also advantageously suitable for marking special tape areas, such as for example marking a measuring area (in particular for audio applications), a reference area or a cleaning area (with cleaning tape).
In der erfindungemäßen Markierung können auch Informationen enthalten sein, die für Forschung und Entwicklung oder den Service von Bandgeräten von Interesse sind, wie beispielsweise das Ermitteln der aktuellen Bandgeschwindigkeit durch Zeitmessung zwischen zwei Markierungsstreifen. Diese Markierungen eignen sich zudem vorteilhaft zur Identifizierung bestimmter Bänder gemäß deren Inhalt, wie beispielsweise als Testband. The marking according to the invention can also contain information that is of interest for research and development or the service of tape devices, such as for example determining the current tape speed by measuring the time between two marking strips. These markings are also useful for identifying certain tapes according to their content, such as a test tape.
Für die Datensicherung erbringt die Erfindung den Vorteil eines erhöhten Schutzes vor mißbräuchlicher Verwendung durch Einbringen einer Seriεnnummer oder eines Kenn- bzw. Schlüsselworts . For data backup, the invention provides the advantage of increased protection against misuse by introducing a serial number or a password or keyword.
Weitere in der erfindungsgemäßen Markierung vorteilhaft ver schiüsselbare Informationen betreffen solche über die Länge des Bandes (wodurch ein vollständiges Durchspulen zur Längenermittlung entfallen kann), über das Bandmaterial (vor allem die Bancbeschichtung), über die maximale Aufzeichnungsdichte, über den Hersteller und die Seriennummer und dgl.. Further ver advantageous in the marking according to the invention Keyable information relates to information about the length of the tape (which means that there is no need to completely wind through to determine the length), about the tape material (especially the banc coating), about the maximum recording density, about the manufacturer and the serial number and the like.
Nachfolgend soll die Erfindung anhand der Zeichnung näher erläutert werden; die einzige Figur der Zeichnung zeigt einen Ausschnitt aus dem erfindungsgemäßen Magnetband im Bereich der optisch abtastbaren Information. The invention will be explained in more detail below with reference to the drawing; the only figure of the drawing shows a section of the magnetic tape according to the invention in the area of the optically scannable information.
Der dargestellte Bandabschnitt 1 besteht aus transparentem Material und trägt eine Mehrzahl von optisch auslesbaren Markierungen in Gestalt von Streifen 2,3,4 und 5. Diese Streifen verlaufen vertikal zur Längserstreckungsrichtung des Bandes und stellen aufgrund ihrer Gestalt und Anordnung einen zu dem magnetisch beschichtetεn Bandbereich zusätzlichen Informationsträger dar. The strip section 1 shown consists of transparent material and carries a plurality of optically readable markings in the form of strips 2, 3, 4 and 5. These strips run vertically to the longitudinal direction of the strip and, due to their shape and arrangement, provide an additional one to the magnetically coated strip area Information carrier.
Die drei Streifen 2, 3 und 5 weisen dieselbe 3reite auf und sind schmäler als ein zwischen den Streifen 3 und 5 angeordneter Streifen 4. Der Abstand der beiden schmalen Streifen 2 und 3 zueinander ist geringer als der Abstand der weiteren schmalen Streifens 5 zu dem breiten Streifen 4 und größer als der Abstand des schmalen Streifens 3 zu dem breiten Streifen 4. The three strips 2, 3 and 5 have the same 3 rider and are narrower than a strip 4 arranged between the strips 3 and 5. The distance between the two narrow strips 2 and 3 is less than the distance between the further narrow strip 5 and the wide one Stripe 4 and greater than the distance between the narrow stripe 3 and the wide stripe 4.
Die Streifen können auf unterschiedlichste Weise auf dem transparenten Träger aufgebracht sein. Für die Massenfertigung eignet sich besonders gut das Bedrucken des transparenten Trägers . Bevorzugt ist eine Schwärzung für die Streifen zugunsten eines wenigstens 95%-Hell-Dunkelübergangs. The strips can be applied to the transparent support in a wide variety of ways. Printing on the transparent substrate is particularly suitable for mass production. A blackening for the strips is preferred in favor of an at least 95% light-dark transition.

Claims

Patentansprüche Claims
1. Magnetband zur elektromagnetischen Speicherung von 1. Magnetic tape for electromagnetic storage of
Daten, mit einem transparenten Bandbereich,  Data, with a transparent band area,
dadurch g e k e n n z e i c h n e t,  characterized,
daß im transparenten Bandbereich (1) eine optisch auslesbare Markierung vorhanden ist und  that an optically readable marking is present in the transparent band area (1) and
daß die Markierung lichtundurchlässige Streifen (3 bis 5) umfaßt, welche im wesentlichen quer zur Transportrichtung des Magnetbandes verlaufen.  that the marking comprises opaque strips (3 to 5) which run essentially transversely to the direction of transport of the magnetic tape.
2. Magnetband nach Anspruch 1, 2. Magnetic tape according to claim 1,
dadurch g e k e n n z e i c h n e t,  characterized,
daß die Streifen (3 bis 5) unterschiedliche Breiten und/oder Abstände aufweisen.  that the strips (3 to 5) have different widths and / or distances.
3. Magnetband nach Anspruch 1 oder 2, 3. Magnetic tape according to claim 1 or 2,
dadurch g e k e n n z e i c h n e t,  characterized,
daß eine vorgegebene Anzahl von Streifen (3 bis 5) innerhalb eines der Länge nach vorgegebenen Bandabschnitts angeordnet; ist.  that a predetermined number of strips (3 to 5) are arranged within a lengthwise predetermined portion of the tape; is.
4. Magnetband nach Anspruch 2, 4. Magnetic tape according to claim 2,
dadurch g e k e n n z e i c h n e t,  characterized,
daß die Streifen (3 bis 5) durch Spleißen, Bedrucken oder als Abziehbild auf dem transparenten Bandbereich (1) aufgebracht sind.  that the strips (3 to 5) are applied to the transparent tape area (1) by splicing, printing or as a decal.
5. Magnetband nach einem der Ansprüche 1 bis 4, 5. Magnetic tape according to one of claims 1 to 4,
dadurch g e k e n n z e i c h n e t, daß der transparente Bandbereich (1) mit den Markierungen (3 bis 5) an wenigstens einem der Enden des Magnetbandes vorgesehen ist. characterized, that the transparent tape area (1) with the markings (3 to 5) is provided on at least one of the ends of the magnetic tape.
6. Magnetband nach einem der Ansprüche 1 bis 5, 6. Magnetic tape according to one of claims 1 to 5,
g e k e n n z e i c h n e t durch  marked by
eine Anordnung des transparenten Bandbereichs (1) innerhalb des Magnetbandes zur Trennung von zwei  an arrangement of the transparent tape area (1) within the magnetic tape to separate two
Magnetbereichen.  Magnetic areas.
7. Magnetband nach einem der Ansprüche 1 bis 6, 7. Magnetic tape according to one of claims 1 to 6,
dadurch g e k e n n z e i c h n e t,  characterized,
daß die optisch auslesbare Markierung Informationen über Parameter des Magnetbandes enthält wie etwa den Typ, die Länge, das Material, die maximale Aufzeichnungsdichte, den Hersteller und die Seriennummer des Magnetbandes.  that the optically readable marking contains information about parameters of the magnetic tape, such as the type, the length, the material, the maximum recording density, the manufacturer and the serial number of the magnetic tape.
8. Magnetband nach einem der vorhergehenden Ansprüche, dadurch g e k e n n z e i c hn e t, 8. Magnetic tape according to one of the preceding claims, characterized g e k e n n z e i c hn e t,
daß zwei Streifen (3 bis 5) zur Geschwindigkeitsmessung des Magnetbandes in einem vorgegebenen Abstand voneinander angeordnet sind.  that two strips (3 to 5) for measuring the speed of the magnetic tape are arranged at a predetermined distance from one another.
9. Magnetband nach einem der vorhergehenden Ansprüche zur Verwendung in einer Bandkassette, insbesondere als DAT-Kassette. 9. Magnetic tape according to one of the preceding claims for use in a tape cassette, in particular as a DAT cassette.
PCT/EP1991/001759 1990-09-17 1991-09-16 Magnetic tape WO1992005549A1 (en)

Applications Claiming Priority (2)

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DE19904029469 DE4029469A1 (en) 1990-09-17 1990-09-17 MAGNETIC TAPE
DEP4029469.2 1990-09-17

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WO1992005549A1 true WO1992005549A1 (en) 1992-04-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2266402A (en) * 1992-04-22 1993-10-27 Hewlett Packard Ltd System for identifying data storage tapes

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE2242210A1 (en) * 1972-08-28 1974-03-07 Licentia Gmbh SYSTEM FOR FINDING SPECIFIC POSITIONS ON A MAGNETIC TAPE
DE2756610A1 (en) * 1977-12-19 1979-06-21 Stoeckigt Gerhard Dipl Wirtsch Device to locate any position on magnetic tape - coats back of tape with reflecting layer with equally spaced absorbing marks identified by detector and counter
DE3505985A1 (en) * 1985-02-21 1986-08-21 Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover Video recorder with automatic sensing of characteristic values applied to the cassette
US4848698A (en) * 1988-06-02 1989-07-18 Newell Research Corporation Method for writing and means for reading position-indicating markers on tape

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2242210A1 (en) * 1972-08-28 1974-03-07 Licentia Gmbh SYSTEM FOR FINDING SPECIFIC POSITIONS ON A MAGNETIC TAPE
DE2756610A1 (en) * 1977-12-19 1979-06-21 Stoeckigt Gerhard Dipl Wirtsch Device to locate any position on magnetic tape - coats back of tape with reflecting layer with equally spaced absorbing marks identified by detector and counter
DE3505985A1 (en) * 1985-02-21 1986-08-21 Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover Video recorder with automatic sensing of characteristic values applied to the cassette
US4848698A (en) * 1988-06-02 1989-07-18 Newell Research Corporation Method for writing and means for reading position-indicating markers on tape

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2266402A (en) * 1992-04-22 1993-10-27 Hewlett Packard Ltd System for identifying data storage tapes
GB2266402B (en) * 1992-04-22 1995-11-08 Hewlett Packard Ltd System for identifying data storage tapes

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