WO2000049604A1 - Procede d'ecriture de signaux d'asservissement sur une bande magnetique - Google Patents
Procede d'ecriture de signaux d'asservissement sur une bande magnetique Download PDFInfo
- Publication number
- WO2000049604A1 WO2000049604A1 PCT/JP1999/000667 JP9900667W WO0049604A1 WO 2000049604 A1 WO2000049604 A1 WO 2000049604A1 JP 9900667 W JP9900667 W JP 9900667W WO 0049604 A1 WO0049604 A1 WO 0049604A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic tape
- optical fiber
- servo signal
- servo
- fiber bundle
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000013307 optical fiber Substances 0.000 claims abstract description 85
- 239000000835 fiber Substances 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 230000004075 alteration Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/584—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
- G11B5/588—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes by controlling the position of the rotating heads
-
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/584—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
Definitions
- the present invention relates to a method and an apparatus for writing a servo signal to a magnetic tape, which can write a servo signal at a narrow pitch.
- One way to increase the recording capacity of a magnetic tape is to increase the data track density.
- the distance between adjacent data tracks becomes smaller, and the magnetic head shifts from the appropriate position of the target data track during data recording / reproducing, resulting in accurate recording. Playback may not be performed.
- Various servo tracking methods have been proposed to prevent this.
- As a typical servo tracking method of a magnetic tape there is a method of forming a servo track corresponding to a servo signal on a magnetic tape by magnetic or mechanical stamping. In this case, the smaller the distance between the formed servo tracks is, the more accurate servo tracking can be performed.
- the servo track forming apparatus needs to be complicated or the size thereof must be increased.
- an object of the present invention is to provide a method and an apparatus for writing a servo signal to a magnetic tape, in which a large number of servo tracks with a narrow pitch can be easily formed. Disclosure of the invention
- a laser beam is incident from one end of an optical fiber bundle in which a plurality of optical fibers are arranged in parallel with each other, and the laser beam emitted from the other end as an emission light source is passed through a focusing lens, Irradiates a portion of the magnetic tape running at high speed where a servo signal can be written, and forms a real image of the same size or smaller than the emission light source on the portion to physically or chemically change.
- the servo track pattern The above object has been achieved by providing a method of writing servo signals on a magnetic tape, which is formed in the tape longitudinal direction at a pitch smaller than the arrangement pitch of optical fibers in a fiber bundle.
- the present invention also provides, as an apparatus preferably used in the above method, a running system for a magnetic tape, a servo signal writing system for the magnetic tape, and a light source system for laser light incident on the servo signal writing system.
- Device for writing a servo signal to a magnetic tape comprising:
- the above-mentioned servo signal writing system comprises: an optical fiber bundle in which a plurality of optical fibers are arranged in parallel with each other so that the central axes of the optical fibers are located on the same plane; A condensing lens for capturing the emitted laser light, wherein an angle between an arrangement direction of a real image of a laser emission light source formed through the lens and a traveling direction of the magnetic tape is a plan view.
- An object of the present invention is to provide a device for writing a servo signal to a magnetic tape including the above-mentioned optical fiber bundle and a lens arranged to be more than 0 ° and less than 90 °.
- the present invention provides a magnetic tape running system, a servo signal writing system for the magnetic tape, and a light source system for laser light incident on the servo signal writing system.
- a servo signal writing device A servo signal writing device,
- the above-mentioned servo signal writing system is an optical system in which two or more sets of optical fiber bundles in which a plurality of optical fibers are arranged in parallel with each other and the center axis of each optical fiber is located on the same plane are arranged.
- FIG. 1 is a schematic diagram showing a first embodiment of a servo signal writing device according to the present invention.
- FIG. 2 is a schematic diagram of a longitudinal section showing the structure of the optical fiber bundle.
- FIG. 3 is a schematic diagram showing a state in which servo tracks are formed on a magnetic tape in plan view.
- FIG. 4 is a schematic diagram showing a servo signal writing system in a second embodiment of the servo signal writing device of the present invention.
- FIG. 5 is a schematic diagram showing another embodiment of the servo signal writing system according to the first embodiment.
- FIGS. 1 to 3 show a servo signal writing device according to a first embodiment of the present invention.
- this device includes a magnetic tape running system (not shown) and a magnetic tape 1. And a light source system 20 for laser light incident on the servo signal writing system 10.
- the running system of the magnetic tape includes a pay-out reel around which a magnetic tape on which a servo track is formed is wound, a take-up reel of the fed-out magnetic tape, and rotation driving means for these reels. In the direction of arrow A in the figure.
- Such a running system has the same mechanism as the running system in the magnetic tape recording / reproducing drive.
- the traveling system includes means (not shown) for regulating either the left or right edge of the magnetic tape 1. By this means, run-out in the tape width direction is prevented during running of the magnetic tape 1, and the distance from the reference tape edge to each servo track pattern becomes constant.
- the laser light source system 20 includes a module part 21 in which the same number of laser diodes as described later are optically coupled to the optical fiber, a driving means 22 for driving each laser diode, and And a connector 23 for optically connecting the module section 21 to an external fiber bundle.
- the driving means 22 is electrically connected to a control means (not shown) of the driving means constituted by an oscillator or the like, and the driving means 22 operates according to a command from the control means. By this operation, the laser diode in each module 21 emits light at a predetermined timing.
- the servo signal writing system 10 includes an optical fiber bundle 12 in which a plurality of optical fibers 11 are arranged parallel to each other and the center axis of each optical fiber 11 is located on the same plane.
- a light-gathering lens 13 having a large aperture diameter is provided.
- the incident end of the optical fiber 11 is optically connected to the connector 23 of the light source system 20 described above.
- the condenser lens 13 is capable of capturing 70% or more, preferably 95% or more, of the emitted laser light 24 emitted from the emission end of the optical fiber bundle 12.
- the condensing lens 13 is provided with an emission light source, that is, a real image 2 having a size equal to or less than 1 times, preferably 0.8 times or less of a spot array of the emission laser light 24 (that is, a linear pattern of the emission laser light 24).
- 5 is arranged at a position where a servo track can be formed on the running magnetic tape 1 (the back coat layer 5 in this embodiment). That is, the condenser lens 13 forms a reduced projection optical system.
- the optical fiber bundle 12 has a large number of linear grooves (preferably V-shaped grooves) 17 arranged in parallel on one surface of a flat plate having a predetermined thickness.
- Each of the optical fibers 11 is disposed in each of the grooves 17 of the lower plate 14, and is covered with a flat plate 15.
- Each groove 17 is arranged such that the central axis of each optical fiber 11 is located on the same plane.
- the grooves 17 are equally spaced so that the distance between adjacent optical fibers 11, that is, the arrangement pitch ⁇ 0 between the optical fibers 11 and 11 is equal to the diameter of the optical fiber 11. Have been.
- the optical fiber bundle 12 has a real image of the emission light source formed on the magnetic tape 1 through the condenser lens 13, that is, the arrangement direction of the real image 25 of the spot array of the laser light 24 emitted from the optical fiber bundle 12,
- the magnetic tape 1 is arranged such that an angle ⁇ (see FIG. 3 described later) with the running direction of the magnetic tape 1 is more than 0 ° and less than 90 ° in plan view.
- the angle between the running direction of the magnetic tape 1 and the arrangement direction of the optical fibers 11 in the optical fiber bundle 12 is more than 0 ° in plan view and 90 ° or less. It is arranged so as to be full.
- the laser diodes of the module section 21 in the light source system 20 are intermittently emitted at predetermined intervals, and each laser diode is formed.
- Laser light is made to enter the corresponding one of the optical fibers 11 one-to-one.
- the laser beam 24 exits from the exit end of the optical fiber bundle 12 and passes through the condenser lens 13 to the magnetic tape 1 traveling at a predetermined speed. Irradiated on the back coat layer 5.
- a real image 25 that is equal to or smaller than the spot row of the emission laser light 24 at the emission end is formed.
- FIG. 3 shows a state in which a real image 25 is formed on the knock coat layer 5 and a servo track pattern is formed.
- the arrow A indicates the running direction of the magnetic tape
- the straight line B indicates the direction in which the real images 25 of the spot array of the emitted laser light are arranged.
- each symbol indicates the irradiation position of the emitted laser light in the real image 25 formed on the back coat layer 5, and S indicates the formed servo track pattern.
- the arrangement pitch of the optical fibers 11 in the optical fiber bundle 12 ⁇ Respect, the pitch P s between the formed servo track pattern S, S is that a small fold msi eta theta. In this way, the arrangement pitch of the optical fibers 11 in the optical fiber bundle 12 ⁇ .
- a plurality of servo track patterns S having a smaller pitch are formed on the back coat layer 5 at the same time.
- Each servo track pattern S is formed intermittently and linearly in the longitudinal direction of the magnetic tape 1 as shown in FIG. Incidentally, the shapes of the adjacent servo track patterns may be the same or different. Also, the servo track pattern does not necessarily need to be formed over the entire length of the magnetic tape 1.
- FIG. 4 the same members as those in FIGS. 1 to 3 are denoted by the same reference numerals.
- FIG. 4 schematically shows a plan view of a servo signal writing system in the device of the present embodiment. However, FIG. 4 does not show the focusing lens. Fig. 4 shows an example in which the reduction ratio of the condenser lens is set to 1: 1.
- the servo signal writing system in the apparatus of the present embodiment includes an optical fiber bundle group 16 having two or more sets of optical fiber bundles 12 (two sets in FIG. 4).
- the optical fibers 11 in each of the optical fiber bundles 12 a and 12 b of the optical fiber bundle group 16 have an arrangement pitch P. Are arranged regularly.
- the optical fiber bundles 12a and 12b and the condenser lens (not shown) are, when viewed in a plan view, from the optical fiber bundles 12a and 12b formed on the magnetic tape 1 through the condenser lens.
- the respective images of the emitted laser light are arranged so as to be orthogonal to the running direction A of the magnetic tape 1 and formed along the running direction A, respectively.
- a method of forming a servo track using the apparatus of the present embodiment will be described with reference to FIG. 4.
- the laser beam emitted from the optical fiber bundle 12 a located upstream with respect to the running direction of the magnetic tape 1 is described.
- the laser light is irradiated onto the back coat layer 5 of the magnetic tape 1 to form a real image of the emitted laser light.
- the pitch is P.
- S a-' is formed.
- the laser light emitted from the optical fiber bundle 12 b located on the downstream side is similarly irradiated onto the back coat layer 5 of the magnetic tape 1, and A real image of the emitted laser light is formed and the pitch is P.
- the servo track patterns S b, sb ⁇ are formed between the adjacent servo track patterns Sa, Sa.
- the pitch between adjacent servo tracks S a and S b is also ⁇ ⁇ , that is, P, since they are arranged so as to be shifted from each other by ⁇ 2. Z2. In this way, the pitch P of the optical fibers 11 in the optical fiber bundle.
- a plurality of servo track patterns with a smaller pitch are formed on the back coat layer 5 at the same time.
- the reduction ratio m of the condenser lens is set to be less than 1, the pitch between the servo tracks becomes ⁇ , and the pitch between the servo track patterns can be further reduced.
- a magnetic tape to which the method of the present invention is applied and a use example of a servo track formed on the magnetic tape will be briefly described.
- a magnetic or non-magnetic intermediate layer is provided on a support, and a magnetic layer as an uppermost layer is provided adjacent to the intermediate layer.
- a back coat layer is provided on the other surface of the support.
- a plurality of data tracks are formed on the magnetic layer in parallel with the running direction of the magnetic tape.
- the back coat layer is used in the above embodiment as a portion where a servo track can be formed, the present invention is not limited to this, and any force or support of any other layer may be used or a new new layer may be used. It is good to have a part.
- the portion where servo tracks can be formed changes physically or chemically by laser beam irradiation, forming a servo track pattern corresponding to the servo signal and producing optical contrast with the non-irradiated portion. It has been made like that.
- Means for producing optical contrast in a servo track pattern include, for example,
- a concave portion having a predetermined depth is formed on the surface, for example, the surface of the back coat layer 5 by laser light irradiation (physical change).
- laser light irradiation physical change
- the present invention is not limited thereto.
- the data track is switched by sequentially moving the head unit having a predetermined number of magnetic heads in the width direction of the magnetic tape to switch the data track, and the data corresponding to each magnetic head is changed. Record or playback on track It is. That is, the recording and reproduction of the video data is performed in the data type. Then, when switching data tracks, and during recording and reproduction, servo tracking is performed based on the servo tracks formed on the magnetic tape so that each magnetic head is positioned on an appropriate data track. Done. Specifically, for example, a servo signal is read optically by irradiating a servo track pattern with light of a predetermined wavelength and detecting the reflected light or transmitted light. Then, based on the read servo signal, the same servo tracking as the push-pull method used in the field of an optical disk or the like is performed.
- the running speed of the magnetic tape at the time of forming the servo track is preferably as large as possible from the viewpoint of productivity, but in consideration of the performance of the running system, it is actually 1 to 5 m / s .
- the output of the laser diode is preferably 5 to 3 OmW at the irradiated portion in order to form a servo track pattern without damaging the magnetic tape.
- the output of the laser diode may be arbitrarily modulated according to the length and period of the pattern.
- the core diameter of the optical fiber 11 affects the size of the real image of the emitted laser light formed on the magnetic tape, that is, the width of the servo track
- the core system is made as small as possible to reduce the track pitch. Les, more desirable,.
- a fiber having a core diameter of 3 to 9 / zm is preferable.
- the beam diameter of the emitted laser light in the real image formed on the magnetic tape is 1 to 9 / xm.
- the angle ⁇ in the first embodiment can be appropriately set according to the arrangement pitch of the optical fibers 11, the reduction ratio of the condenser lens 13, the track pitch of the formed servo track, and the like.
- the reduction magnification m of the condenser lens 13 is preferably as small as possible in order to reduce the error of the track pitch of the servo track with respect to the angle ⁇ , but it is preferably 0.3 to 0.8 in terms of the depth of focus and the lens aberration. Preferably it is twice.
- a portion other than the backcoat layer has a servo track. It may be one that can form a hook.
- a plurality of optical fiber bundles 12 may be regularly arranged at predetermined intervals over the width direction of the magnetic tape 1.
- the condenser lens is omitted.
- a plurality of optical fiber bundle groups 16 shown in FIG. 4 may be used, and these may be regularly arranged at predetermined intervals over the width direction of the magnetic tape 1.
- the means for inclining the arrangement direction of the real images formed on the magnetic tape 1 with respect to the running direction A of the magnetic tape 1 includes: Alternatively, only the real image can be tilted by an optical system such as a condenser lens in the servo signal writing system.
- optical fiber bundle group 16 shown in FIG. 4 when the optical fiber bundle group 16 shown in FIG. 4 is disposed at a predetermined angle with respect to the running direction of the magnetic tape as in the servo signal writing system in the apparatus shown in FIG. A servo track pattern can be formed on a magnetic tape. Further, the optical fiber bundles 12a and 12b in the optical fiber bundle group 16 shown in FIG. 4 are forces that are arranged in close contact with each other. Alternatively, they may be separated from each other. Industrial applicability
- the magnetic tape produced in accordance with the present invention is performed more accurate servo tracking, track density of the data track can be further enhanced, thereby further enhancing the thus recording capacity c
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99903927A EP1205912A4 (en) | 1999-02-16 | 1999-02-16 | METHOD FOR WRITING SERVO SIGNALS ON MAGNETIC TAPE |
JP2000600265A JP4293733B2 (ja) | 1999-02-16 | 1999-02-16 | 磁気テープへのサーボ信号書き込み方法 |
US09/890,898 US6741415B1 (en) | 1999-02-16 | 1999-02-16 | Method of writing servo signal on magnetic tape |
AU24410/99A AU2441099A (en) | 1999-02-16 | 1999-02-16 | Method of writing servo signal on magnetic tape |
PCT/JP1999/000667 WO2000049604A1 (fr) | 1999-02-16 | 1999-02-16 | Procede d'ecriture de signaux d'asservissement sur une bande magnetique |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1999/000667 WO2000049604A1 (fr) | 1999-02-16 | 1999-02-16 | Procede d'ecriture de signaux d'asservissement sur une bande magnetique |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000049604A1 true WO2000049604A1 (fr) | 2000-08-24 |
Family
ID=14234932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/000667 WO2000049604A1 (fr) | 1999-02-16 | 1999-02-16 | Procede d'ecriture de signaux d'asservissement sur une bande magnetique |
Country Status (5)
Country | Link |
---|---|
US (1) | US6741415B1 (ja) |
EP (1) | EP1205912A4 (ja) |
JP (1) | JP4293733B2 (ja) |
AU (1) | AU2441099A (ja) |
WO (1) | WO2000049604A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1361568A1 (en) * | 2002-05-07 | 2003-11-12 | Quantum Corporation | Optical servo track identification on tape storage media |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030054203A1 (en) * | 1997-10-22 | 2003-03-20 | Quantum Corporation, A California Corporation | Magnetic tape |
WO2000049604A1 (fr) | 1999-02-16 | 2000-08-24 | Quantum Corporation | Procede d'ecriture de signaux d'asservissement sur une bande magnetique |
EP1205913A4 (en) | 1999-02-17 | 2002-08-14 | Quantum Corp | METHOD FOR WRITING SERVO SIGNALS ON MAGNETIC TAPE |
JP3830088B2 (ja) * | 2001-11-29 | 2006-10-04 | 富士写真フイルム株式会社 | サーボ制御方法、磁気テープ、及び磁気テープ記録再生装置 |
US20060140077A1 (en) * | 2004-12-28 | 2006-06-29 | Quantum Corporation | Focalizer alignment |
US7119976B2 (en) * | 2005-01-12 | 2006-10-10 | International Business Machines Corporation | Planar servo format verifier head |
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- 1999-02-16 AU AU24410/99A patent/AU2441099A/en not_active Abandoned
- 1999-02-16 EP EP99903927A patent/EP1205912A4/en not_active Withdrawn
- 1999-02-16 US US09/890,898 patent/US6741415B1/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
EP1205912A4 (en) | 2002-08-21 |
AU2441099A (en) | 2000-09-04 |
JP4293733B2 (ja) | 2009-07-08 |
EP1205912A1 (en) | 2002-05-15 |
US6741415B1 (en) | 2004-05-25 |
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