JP2005332540A - Driving method of linear tape recording and reproducing apparatus, and linear tape recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a reading time at the time of reproduction in a driving method of a linear tape recording and reproducing apparatus. <P>SOLUTION: A plurality of magnetic heads each having a reproduction element is position-controlled independently in the direction of track width, the reproduction elements of the respective magnetic heads are deviated by a prescribed track pitch, and the reproduction elements of the respective magnetic heads are operated simultaneously. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a linear tape recording / reproducing apparatus used in a linear tape storage system represented by DLT (Digital Linear Tape) and LTO (Linear Tape Open).

  In recent years, due to the explosive increase in the amount of digital data, a large-scale backup is required, and a tape storage system having excellent cost merit per bit is used. In tape storage, a magnetic recording system (tape) that records magnetic information obliquely on a magnetic recording medium (tape) installed on a rotating drum, and a magnetic head is driven by moving the tape at high speed and moving the magnetic head up and down. Two types of linear methods for recording information on a tape are known. Currently, linear tape streamers are the mainstream.

  FIG. 12 shows a magnetic head device used in a general linear tape recording / reproducing apparatus. The magnetic head device 1 is configured by combining two head arrays A and B each having similar recording / reproducing elements. One head array A is a recording / reproducing device in which a reproducing element 2A, for example, a magnetoresistive effect type magnetic head element (hereinafter referred to as an MR element) and a recording element 3A, for example, an inductive type magnetic head element 3 are laminated. A plurality of laminated elements 4A are arranged in the track width direction (longitudinal direction in FIG. 12) of a magnetic tape as a recording medium. This head array A has a so-called multi-channel structure. The reproducing element 2A is formed by being sandwiched between a lower shield core (magnetic core) 5 and an intermediate shield core (magnetic core) 6 used for a magnetic shield. The recording element 3A is formed by an intermediate layer shield core 6, an upper magnetic core 7 with a magnetic gap g, and a conductor coil (not shown).

  Similarly to the head array A, the other head array B has a recording / reproducing laminated element 4B formed by laminating an MR element as the reproducing element 2B and an inductive magnetic head element as the recording element 3B. A plurality are arranged in the width direction (vertical direction in FIG. 12). The configuration of the recording / reproducing laminated element 4B is the same as that of the recording / reproducing laminated element 4A of the head array A. The same reference numerals are given and redundant description is omitted. The head array B also has a multi-channel structure corresponding to the head array A.

  In this case, the recording / reproducing laminated element 4 of the head array A and the recording / reproducing laminated element 4 of the head array B are arranged so that the channels corresponding to each other are located on each line in the running direction of the magnetic tape. The Actually, the head array A and the head array B are combined with an accuracy of about ± 2.0 μm with respect to the running direction of the magnetic tape. Further, the recording / reproducing element 4 of the head array A and the recording / reproducing laminated element 4 of the head array B are arranged symmetrically with each other so that the recording element 3 faces, for example.

  In the linear tape recording / reproducing apparatus including the magnetic head device 1, the magnetic tape travels in the forward direction (F) and the reverse direction (R) with respect to the magnetic head device 1. When the magnetic tape travels in the forward direction (F), data is recorded by the recording element 3A of the head array A, and it is confirmed by reading that there is no error in the recording data by the reproducing element 2B of the head array B. Do. When the magnetic tape reaches the end due to the tape running in the F direction, the tape running direction is switched from (F) to (R), and the magnetic head device 1 moves in the track width direction (V) to the track of the unrecorded portion. Data recording is performed. At this time, data is recorded by the recording element 3B of the head array B, and the recording data is read by the reproducing element 2A of the head array A to confirm that there is no error.

  In this way, a serpentine recording method is used in which the magnetic tape data is recorded on the entire surface of the magnetic tape by switching the traveling direction of the magnetic tape and moving the magnetic head device 1 in the V direction. When reading recorded data (so-called reproduction), the reproducing element 2B of the head array B is used in the tape running direction (F) and the head array is used in the tape running direction (R) as in the recording. Reading is performed using the reproducing element 2A of A.

Patent Document 1 describes examples of a magnetic head device and a magnetic reproducing device in a linear tape system.
JP 2003-132504 A

  Incidentally, in a tape storage system, not only an increase in recording capacity but also an improvement in data transfer speed are required. As a method for improving the transfer rate, the linear recording density is improved and the number of recording / reproducing elements is increased. Particularly effective is an increase in the number of head channels. By doubling the number of channels, a double transfer rate can be obtained at the same linear recording density and tape speed. However, the increase in the number of channels of the magnetic head device has a large effect on the head yield, and there is a problem that the head cost is increased.

  The recording / reproducing time of an LTO system or S-DLT system, which is a general linear tape system, requires about 150 to 170 minutes per tape roll. The number of recording channels is 8, and assuming that the yield (non-defective product rate) of each channel is 90%, the yield of the entire 8 channels is 43%. When the number of channels is doubled to 16 channels, the head yield is 18.5%, and it can be seen that the increase in the number of channels greatly affects the head yield.

  In view of the above-mentioned points, the present invention provides a driving method of a linear tape recording / reproducing apparatus that improves the data transfer speed, particularly reduces the reading time during reproduction, and a linear tape recording / reproducing apparatus using this driving method. It is to provide.

  In the driving method of the linear tape recording / reproducing apparatus according to the present invention, the position of a plurality of magnetic heads having reproducing elements is independently controlled in the track width direction, and the reproducing elements of each magnetic head are shifted from each other by a predetermined track pitch, The reproducing element of each magnetic head is operated simultaneously.

  The driving method of the linear tape recording / reproducing apparatus according to the present invention controls the position of a plurality of magnetic heads having recording / reproducing laminated elements independently in the track width direction, and the reproducing elements of each magnetic head are mutually connected to a predetermined track. The reproducing element of each magnetic head is operated simultaneously with a pitch shift.

  A driving method of a linear tape recording / reproducing apparatus according to the present invention includes a magnetic head having a recording element and a magnetic head having a reproducing element, and at least a plurality of magnetic heads having a reproducing element are independently positioned in the track width direction. The reproducing elements of a plurality of magnetic heads are controlled to be shifted from each other by a predetermined track pitch, and the reproducing elements are operated simultaneously.

  A linear tape recording / reproducing apparatus according to the present invention includes a plurality of magnetic heads having reproducing elements, and each magnetic head is arranged so that its position can be independently controlled in the track width direction, and the reproducing elements of each magnetic head are mutually connected. The reproducing elements are operated at the same time with a predetermined track pitch shifted.

  A linear tape recording / reproducing apparatus according to the present invention includes a plurality of magnetic heads each having a recording / reproducing laminated element, and each magnetic head is independently arranged to be position-controllable in the track width direction. The reproduction elements are operated at the same time with a predetermined track pitch shifted from each other.

  A linear tape recording / reproducing apparatus according to the present invention includes a magnetic head having a recording element and a magnetic head having a reproducing element, and at least a plurality of magnetic heads having the reproducing element are independently controlled in the track width direction. The reproducing elements of the plurality of magnetic heads are arranged so as to be shifted from each other by a predetermined track pitch, and the reproducing elements are operated simultaneously.

The magnetic head has a multi-channel structure.
For the position control of the magnetic head, it is preferable to use a bimorph actuator, a laminated piezo actuator, or a voice coil motor.
Servo read elements are stacked on each magnetic head.

  According to the driving method of the linear tape recording / reproducing apparatus of the present invention, the position of a plurality of magnetic heads having reproducing elements is independently controlled in the track width direction, and the reproducing elements of the magnetic heads are mutually connected to predetermined tracks. By shifting the pitch to the pitch and simultaneously operating the playback elements, the number of playback channels when reading recorded data can be doubled. Thereby, the reading time at the time of reproduction can be greatly reduced as compared with the conventional method.

  According to the driving method of the linear tape recording / reproducing apparatus of the present invention, the position of the plurality of magnetic heads having the recording / reproducing laminated elements is independently controlled in the track width direction, and the reproducing elements of the magnetic heads are mutually connected. By shifting to a predetermined track pitch and simultaneously operating each reproducing element, the number of reproducing channels at the time of reading recorded data can be doubled. Thereby, the reading time at the time of reproduction can be greatly reduced as compared with the conventional method.

  According to the driving method of the linear tape recording / reproducing apparatus of the present invention, a magnetic head having a recording element and a magnetic head having a reproducing element are provided, and at least a plurality of magnetic heads having the reproducing element are independently provided. By controlling the position in the track width direction and shifting the reproducing elements of a plurality of magnetic heads to a predetermined track pitch with each other and operating each reproducing element simultaneously, the number of reproducing channels at the time of reading the recorded data is doubled. be able to. Thereby, the reading time at the time of reproduction can be greatly reduced as compared with the conventional method.

  According to the linear tape recording / reproducing apparatus of the present invention, the plurality of magnetic heads having the reproducing elements are arranged so as to be independently position-controllable in the track width direction. Can be shifted to the track pitch. And, by shifting each playback element to a predetermined track pitch and operating each playback element at the same time, the number of playback channels when reading recorded data is doubled, and the reading time during playback is greatly increased compared to the conventional method. Can be shortened.

  According to the linear tape recording / reproducing apparatus of the present invention, a plurality of magnetic heads having recording / reproducing laminated elements are arranged so that the position can be controlled independently in the track width direction. Can be shifted to a predetermined track pitch. And, by shifting each playback element to a predetermined track pitch and operating each playback element at the same time, the number of playback channels when reading recorded data is doubled, and the reading time during playback is greatly increased compared to the conventional method. Can be shortened.

  According to the linear tape recording / reproducing apparatus of the present invention, a magnetic head having a recording element and a magnetic head having a reproducing element are provided, and at least a plurality of magnetic heads having a reproducing element are independently provided in the track width direction. Since the positions can be controlled, the reproducing elements of the plurality of magnetic heads can be shifted to each other at a predetermined track pitch. And, by shifting each playback element to a predetermined track pitch and operating each playback element at the same time, the number of playback channels when reading recorded data is doubled, and the reading time during playback is greatly increased compared to the conventional method. Can be shortened.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the current linear tape recording / reproducing apparatus, at the time of reproducing, the recording data is read by using the reproducing element of one of the two head arrays depending on the tape running direction. This is caused by the restriction that the track positions of the two head arrays are fixed. In the present invention, a plurality of, for example, two head arrays are configured so that the positioning control can be performed independently, and only when reproducing, the positions of the plurality of head arrays are shifted from each other, and reproduction is simultaneously performed by the reproducing elements of each head array. Like that. As a result, a plurality of reproduction channel operations can be performed, and the current multiple reading speed can be achieved.

  FIG. 1 shows a schematic configuration of an embodiment of a head actuator unit that realizes a linear tape recording / reproducing apparatus of the present invention, that is, a magnetic head apparatus. In the magnetic head device 11 according to the present embodiment, a plurality of support blocks 12, in this example, two head arrays 14 A and 14 B constituting two head arrays A and B are driven via position control means 13 A and 13 B, respectively. Supporting them in parallel. As shown in FIG. 2, the head block 14A has a recording / reproducing laminated element 17A in which a recording element (magnetic head element) 15A and a reproducing element (magnetic head element) 16A having the same configuration as described in FIG. 12, for example, are laminated. Are arranged corresponding to the number of channels in the track width direction (vertical direction in FIG. 1). That is, each recording / reproducing laminated element 17A includes, for example, an MR element reproducing element 16A disposed between a lower shield core and an intermediate shield core, and an inductive head having a magnetic gap made up of an intermediate shield core and an upper magnetic core. The recording element 15A is stacked. Further, servo read elements (magnetic head elements) 18A for detecting servo signals are arranged at positions on both upper and lower ends of the recording / reproducing laminated elements 17A group arranged in the vertical direction.

  Similarly to the head block 14A, the head block 14B includes a plurality of recording / reproducing laminated elements 17B in which recording elements (magnetic head elements) 15B and reproducing elements (magnetic head elements) 16B are laminated corresponding to the number of channels in the track width direction. Servo reading elements (magnetic head elements: hereinafter referred to as servo elements) 18B for detecting servo signals are arranged at both ends of the recording / reproducing laminated elements 17B arranged in the vertical direction. The The recording / reproducing stacked elements 17A and 17B of the head blocks 14A and 14B are arranged so that the reproducing elements 16A and 16B face each other.

  The head blocks 14A and 14B are supported via position control means 13A and 13B so that they can be finely adjusted in the track width direction (V) independently of the support block 12 and moved by an even multiple of the track pitch. The In this example, bimorph actuators are used as the position control means 13A and 13B. One end of the pair of bimorph actuators 13 </ b> A is fixed to the upper and lower ends of the head block 14 </ b> A, and the other end is fixed to the upper and lower surfaces of the support block 12. One end of the pair of bimorph actuators 13B is fixed to the upper and lower ends of the head block 14B, and the other end is fixed to the upper and lower surfaces of the support block 12. Each of the pair of bimorph actuators 13A, 13B is provided to be displaced in the same direction so that the head blocks 14A, 14B can be finely adjusted in the V direction and moved by an even multiple of the track pitch.

  On the other hand, the support block 12 can move the recording / reproducing laminated elements 17A, 17B to the required channel track of the magnetic tape by coarsely adjusting the head blocks 14A, 14B in the V direction (not shown). , Coupled to coarse movement means, for example a stepping motor. The entire head blocks 14A and 14B are coarsely adjusted in the V direction by driving the stepping motor.

The multi-channel laminated elements 17A and 17B of the head blocks 14A and 14B are arranged at intervals of a multiple of the track pitch.
On the other hand, as shown in FIG. 2, on the magnetic tape 21, tracks 22 for a plurality of channels corresponding to the entire interval including the laminated elements 17A and 17B and the servo elements 18A and 18B provided in the head blocks 14A and 14B are placed. Servo signal 23 is recorded in In this example, a timing-based servo system used in LTO or the like is used, and the servo signal 23 is recorded by arranging a plurality of parallel magnetization patterns in a square shape (hereinafter referred to as a square pattern). The

Next, a linear tape recording / reproducing driving method using this magnetic head device 11, that is, a recording / reproducing operation will be described.
FIG. 2 is a schematic diagram showing the positions of the head blocks 14A and 14B during the recording operation. During the recording operation, the bimorph actuators 13A and 13B are driven and finely adjusted so that the corresponding laminated elements 17A and 17B of the head blocks 14A and 14B come to the same position center of each track 22 with the servo signal 23 as a reference to adjust both heads. The blocks 14A and 14B are positioned. That is, the servo signal 23 is detected by the servo elements 18A and 18B. The servo signal detection output 24A detected by the servo element 18A of the head block 14A and the servo signal detection output 24B detected by the servo element 18B of the head block 14B show the same waveform as shown in FIG. And 25B are equal. In this state, the magnetic tape 2 is run in one direction (F), data is recorded by the recording element 15A of the head block 14A, and it is confirmed by reading with the reproducing element 16B of the head block 14B that there is no error in the recorded data. However, recording is performed. When the magnetic tape 21 reaches the end, the traveling direction is switched from (F) to (R), and the head blocks 14A and 14B are simultaneously moved in the (V) direction via the support block 12 by the stepping motor. It moves by one track pitch (TWP) and records data on an unrecorded track in the same manner. In this case, the coarse movement is adjusted by the stepping motor, and the fine movement is adjusted by the bimorph actuator.

  Next, FIGS. 4 and 5 show the positions of the head blocks 14A and 14B at the time of reading (reproducing). At the time of reading, the bimorph actuator 13A is detected from the detection outputs 24A and 24B of the servo signals detected by the servo elements 18A and 18B so that the head block 14A and the head block 14B are separated by an even multiple of the recording track pitch, in this example, twice the distance. , 13B are operated to control the position of the laminated element of each head block. As shown in FIG. 5, the V-direction interval between the servo element 18A of the head block 14A and the servo element 18B of the head block 14B is preferably an even multiple of the track pitch (TWP), but 1 of the track pitch (TWP). If it is more than twice, the distance is not limited.

  As the positions of the head blocks 14A and 14 shift, the servo signal detection output 24A obtained from the servo element 18A and the servo signal detection output 24B obtained from the servo element 18B show different waveforms as shown in FIG. Becomes longer than the burst width 25A. For example, when the track pitch (TWP) is 20 μm, if the double track pitch 40 μm is shifted in the V direction, the servo signal detection output 24B detected by the servo element 18B of the head block 14B has a burst interval 25B of the head block 14B. The waveform is increased by about 16.82% from the burst interval 25A of the servo signal detection output 24A by the servo element 18A of 14A.

  In this state, the magnetic tape 21 is moved in one direction (F), and the recording data of the two recording tracks are simultaneously read (reproduced) by the reproducing elements 16A and 16B of the head blocks 14A and 14B. When the magnetic tape 21 reaches the end, the running direction is switched from (F) to (R), and the stepping motor is driven to move the head blocks 14A and 14B simultaneously in the V direction via the support block 12, In the example, the position is controlled so as to move by one track pitch (TWP) and the stacked elements are separated from each other by two track pitches (2 × TWP) by a bimorph actuator (in this case, fine adjustment). Similarly, the recording data of the two recording tracks are simultaneously read (reproduced) by the reproducing elements 16A and 16B.

  According to the above-described embodiment, the head blocks 14A and 14B constituting the two head arrays A and B are supported via the bimorph actuators 13A and 143B that independently control the position, and the recording data is read. At the time of reproduction (during reproduction), the reproducing elements 16A and 16B of both the head blocks 14A and 14B are driven in the tape width direction beyond the track pitch (TWP) by driving the bimorph actuators 13A and 13B. The number of playback channels can be doubled, and the read time during playback can be halved compared to the conventional method.

  Next, FIG. 7 shows another embodiment of the magnetic head device according to the present invention. The magnetic head device 31 according to the present embodiment is configured using laminated piezoelectric actuators 32A and 32B as position control means for the head blocks 14A and 14B. That is, in the same manner as described above, the magnetic head device 31 has a plurality of support blocks 12 and, in this example, two head arrays A and B, through the position control means for independently driving the head blocks 14A and 14B. Supported in parallel. In this case, the laminated piezo actuators 32A and 32B are used as position control means, and the head blocks 14A and 14B can be independently driven in the V direction. The laminated piezoelectric actuators 32A and 32B are supported on the support block 12 so as to expand and contract in the V direction. The head blocks 14A and 14B are disposed so as to be suspended via support members 33A and 33B fixed to the upper ends of the laminated piezoelectric actuators 32A and 32B. The head blocks 14A and 14B are independently position controlled in the direction by driving the laminated piezoelectric actuators 32A and 32B.

  As described above, the head block 14A and the head block 14B include a recording / reproducing laminated element 17A in which a recording element 15A and a reproducing element 16A are laminated, and a recording / reproducing laminated element 17BA in which a recording element 15B and a reproducing element 16B are laminated. A plurality are arranged corresponding to the number of channels in the track width direction (vertical direction in FIG. 2), and the servo elements 18A and 18B are arranged. Further, a stepping motor is connected to the support block 12 as described above.

  When individually controlling the positions of the head blocks 14A and 14B, at present, the position control means includes the bimorph actuators 13A and 13B shown in FIG. 1 and a voice coil motor (currently used for position control of the head device). Like VCM), a movable range of several tens of μm is required. However, as the recording density is improved in the future, the track pitch becomes several μm units and a large movable range becomes unnecessary. For such a track format, it is effective to use the laminated piezoelectric actuators 32A and 32B capable of higher band operation. In the magnetic head device 31 of FIG. 7, when a required voltage is applied to the laminated piezo actuators 32A and 32B, the laminated piezo actuators 32A and 32B extend in the V direction to control the position of the head blocks 14A and 14B. Is done.

  As another embodiment of the magnetic head device according to the present invention, the above-described voice coil motor can be used as the position control means for individually controlling the position of the head blocks 14A and 14B. This voice coil motor is a kind of linear motor that linearly moves the head blocks 14A and 14B, and is also called a linear actuator. Although not shown, in principle, a voice coil motor has a pair of magnets arranged opposite to each other inside a U-shaped magnetic yoke to generate a magnetic field between the two magnets. A voice coil is mounted, and the voice coil is configured to linearly move by being guided by one magnet and a magnetic yoke in accordance with both currents flowing through the coil.

  FIG. 8 shows still another embodiment of the magnetic head device according to the present invention. The magnetic head device 35 according to the present embodiment includes a first reproducing head block 41A having only a plurality of reproducing elements 37A and servo elements 38A corresponding to the number of channels, and a plurality of reproducing elements corresponding to the number of channels. A second reproducing head block 41B having only the element 37B and the servo element 38B, and a plurality of recording elements 39 corresponding to the number of channels and a recording head block 42 having only the servo elements 38C are provided. The first and second reproducing head blocks 41A and 41B are arranged in the tape running direction with the recording head block 4 interposed therebetween. The first and second reproducing head blocks 41A and 41B and the recording head block 42 are supported on the support block 12 so that the position can be independently controlled via position control means, for example, bimorph actuators 43A, 43B and 43C. Is done.

  During recording, the magnetic head device 35 reads data recorded by the recording element 39 of the recording head block 42 in the tape traveling direction (F) by the reproducing element 37B of the second reproducing head block 41B, and generates an error. In tape running (R), the data recorded by the recording element 39 of the recording head block 42 is read by the first reproducing head block 41B to confirm that there is no error.

  At the time of reading (reproducing), the bimorph actuators 43A and 43B are driven to move the first and second reproducing head blocks 41A and 41B to an even multiple of the recording track pitch in the V direction, for example, Shift so that the distance is doubled. In this state, the magnetic tape is run, and the first and second reproducing elements 38A and 38B simultaneously read the recording data of the two recording tracks.

  In the magnetic head device 35 shown in FIG. 8, instead of the bimorph actuators 43A, 43B, and 434C, the above-described laminated piezoelectric actuator, voice coil motor, or the like can be used as the position control means.

  In the above-described embodiment shown in FIGS. 1 to 6, a timing-based servo system is used for positioning the head arrays A and B. In this servo system, position information can be detected from a time difference between servo signals. On the other hand, in the amplitude servo system that detects the position from the output signal, the head array A is used for track alignment in the F direction and the head array B is used for track alignment in the R direction. However, there is a problem that independent position control is not possible.

FIG. 9 illustrates a conventional amplitude servo system. FIG. 9 shows a servo operation state when the magnetic tape is run in the F direction. On a magnetic tape 51 having a multi-channel track 53, a plurality of burst signals 52 are divided and arranged at predetermined intervals in the track longitudinal direction, and the position of the row of burst signals 52 is shifted in the track width direction to It is formed. That is, the plurality of burst signals 52 [52a, 52b] are arranged in a staggered manner within a plurality of tracks.
The head arrays A and B are joined together. Since data recording when the magnetic tape travels in the F direction is taken as an example, only the recording element 55A and the servo element 56C are representatively shown for the head array A, and the reproducing element is representative for the head array B. Only 54B and servo element 56D are shown. Servo elements 56C and 56D formed on two adjacent tracks are provided with a shift of ½ of the track pitch (TWP) of burst signal 52 from each other.

  The servo element 56C of the recording-side head array A scans the line extending over the burst signals 52a and 52b formed in two adjacent tracks so that the output levels of the burst signal 52a and the burst signal 52b are equalized. The actuator is controlled by an actuator (position control means). However, at this time, the servo element 56D of the head-side B on the reproducing side scans the burst signal track, that is, it does not straddle the burst signals on two adjacent tracks, contributing to servo control. do not do.

  Next, another embodiment of a magnetic head device using the amplitude servo system according to the present invention will be described with reference to FIGS. The magnetic head device 61 according to the present embodiment is supported by an actuator (position control means) so that the head array A and the head array B having a multi-channel structure can be independently controlled in the same manner as described above. A recording / reproducing stacked element 17A having a reproducing element 16A and a recording element 15A is formed in the head block 14A of the head array A, and a recording / reproducing element having a reproducing element 16B and a recording element 15B is formed in the head block 14B of the head array B. The reproduction laminated element 17B is formed. In this example, the reproducing element 16A on the head block 14A side and the reproducing element 16B on the head block 14B side are formed to face each other.

  On the other hand, in the head block 14A, servo elements 18C and 18E are provided on the extended lines of the recording element 15A and the reproducing element 16A so as to be shifted from each other by 1/2 of the track pitch (YWP) of the burst signal 52, respectively. In the head block 14B, servo elements 18F and 18D are provided on the extended lines of the recording element 15B and the reproducing element 16B so as to be shifted from each other by half the track pitch (YWP) of the burst signal 52, respectively. Moreover, although the servo element 18C and the servo element 18F are provided on the same line, the servo element 18E and the servo element 18D are provided with a shift of one track pitch (TWP).

Next, the servo operation by the magnetic head device 61 of this embodiment will be described. FIG. 10 shows a servo control state during recording when the magnetic tape 51 is moved in the F direction. The servo element 18C on the head block 14A side and the servo element 18F on the head block 14B side detect both burst signals 52a and 52b formed on two tracks, respectively, so that the recording element 15A and head block on the head block 14A side are detected. The reproducing element 16B on the 14B side is arranged on the same track.
FIG. 11 shows a state of servo control at the time of reading (reproducing) when the magnetic tape 51 is run in the F direction. Position control with only one head block is possible. That is, when the servo element 18C on the head block 14A side detects both burst signals 52a and 52b formed on two tracks, the reproducing element 16A of the head block 14A is arranged on a required track. Further, when the servo element 18F on the head block 14B side detects both burst signals 52a and 52b formed on two tracks, the reproducing element 16B of the head block 14B is on a track shifted by two track pitches (2TWP). Placed in.

The magnetic head device 61 capable of independently controlling the position of the head blocks 14A and 14B described above can be applied to a timing-based servo system by using the servo elements 18C and 18F.
10 and 11, only the servo elements on one side of the multilayer elements 17A and 17B are shown in the head blocks 14A and 14B. However, as can be understood from the conventional technique, servo elements are provided on both sides of the multilayer elements. Is desirable. On magnetic tape, burst signals are recorded every other channel.

1 is a schematic configuration diagram showing an embodiment of a magnetic head device of a linear tape recording / reproducing apparatus according to the present invention. FIG. 2 is an explanatory diagram showing an arrangement state of head blocks during recording in the magnetic head device of FIG. 1. FIG. 2 is a servo signal waveform diagram during recording in the magnetic head device of FIG. 1. FIG. 2 is an explanatory diagram showing an arrangement state of head blocks during reproduction in the magnetic head device of FIG. 1. FIG. 2 is an enlarged view showing an arrangement state of head blocks during reproduction in the magnetic head device of FIG. 1. FIG. 2 is a servo signal waveform diagram during reproduction in the magnetic head device of FIG. 1. It is a schematic block diagram which shows other embodiment of the magnetic head apparatus of the linear tape recording / reproducing apparatus based on this invention. It is a schematic block diagram which shows other embodiment of the magnetic head apparatus of the linear tape recording / reproducing apparatus based on this invention. It is explanatory drawing which shows the example of arrangement | positioning of the servo element in the conventional magnetic head apparatus. It is explanatory drawing which shows the example of arrangement | positioning of the servo element at the time of recording of the magnetic head apparatus at the time of applying this invention to an amplified servo system. It is explanatory drawing which shows the example of arrangement | positioning of the servo element at the time of reproduction | regeneration of a magnetic head apparatus at the time of applying this invention to an amplified servo system. It is a schematic block diagram which shows the example of the magnetic head apparatus of the conventional linear tape recording / reproducing apparatus.

Explanation of symbols

  11, 31, 35 ... Magnetic head, 12 ... Support block, 13A, 13B ... Bimorph actuator, 14A, 14B ... Head block, 17A, 17B ... Recording / reproducing laminated element, 18A, 18B ... Servo element , 21 .. Magnetic tape, 22... Track, 23 .. Servo signal, 32 A, 32 B .. Multilayer piezo actuator, 37 A, 37 B .. Reproducing element, 38 A, 38 B, 38 C .. Servo element, 39. , 41A, 41B, 42 .. Head block

Claims (21)

Control the position of multiple magnetic heads with read elements in the track width direction independently,
A driving method for a linear tape recording / reproducing apparatus, wherein the reproducing elements of the magnetic heads are operated at the same time by mutually shifting the reproducing elements of the magnetic heads by a predetermined track pitch. A plurality of magnetic heads having recording / reproducing laminated elements are independently controlled in position in the track width direction,
A method of driving a linear tape recording / reproducing apparatus, wherein the reproducing elements of the magnetic heads are simultaneously operated while the reproducing elements of the magnetic heads are shifted from each other by a predetermined track pitch. A magnetic head having a recording element and a magnetic head having a reproducing element;
A plurality of magnetic heads having at least the reproducing element are independently controlled in position in the track width direction,
A method for driving a linear tape recording / reproducing apparatus, wherein the reproducing elements of the plurality of magnetic heads are operated at the same time with a predetermined track pitch being shifted from each other. Comprising a plurality of magnetic heads having reproducing elements;
Each of the magnetic heads is independently arranged to be position-controllable in the track width direction,
A linear tape recording / reproducing apparatus characterized in that the reproducing elements of the magnetic heads are shifted from each other by a predetermined track pitch so that the reproducing elements are operated simultaneously. A plurality of magnetic heads having recording / reproducing laminated elements;
Each of the magnetic heads is independently arranged to be position-controllable in the track width direction,
A linear tape recording / reproducing apparatus characterized in that the reproducing elements of the magnetic heads are shifted from each other by a predetermined track pitch so that the reproducing elements are operated simultaneously. A magnetic head having a recording element and a magnetic head having a reproducing element;
A plurality of magnetic heads having at least the reproducing element are arranged so as to be independently position-controllable in the track width direction,
A linear tape recording / reproducing apparatus, wherein the reproducing elements of the plurality of magnetic heads are shifted from each other by a predetermined track pitch so that the reproducing elements are operated simultaneously. The linear tape recording / reproducing apparatus according to claim 4, wherein the magnetic head has a multi-channel structure. The linear tape recording / reproducing apparatus according to claim 5, wherein the magnetic head has a multi-channel structure. The linear tape recording / reproducing apparatus according to claim 6, wherein the magnetic head has a multi-channel structure. The linear tape recording / reproducing apparatus according to claim 4, wherein a bimorph actuator is used for position control of the magnetic head. The linear tape recording / reproducing apparatus according to claim 5, wherein a bimorph actuator is used for position control of the magnetic head. The linear tape recording / reproducing apparatus according to claim 6, wherein a bimorph actuator is used for position control of the magnetic head. The linear tape recording / reproducing apparatus according to claim 4, wherein a laminated piezo actuator is used for position control of the magnetic head. The linear tape recording / reproducing apparatus according to claim 5, wherein a laminated piezo actuator is used for position control of the magnetic head. The linear tape recording / reproducing apparatus according to claim 6, wherein a laminated piezo actuator is used for position control of the magnetic head. The linear tape recording / reproducing apparatus according to claim 4, wherein a voice coil motor is used for position control of the magnetic head. The linear tape recording / reproducing apparatus according to claim 5, wherein a voice coil motor is used for position control of the magnetic head. The linear tape recording / reproducing apparatus according to claim 6, wherein a voice coil motor is used for position control of the magnetic head. The linear tape recording / reproducing apparatus according to claim 4, wherein servo read elements are stacked on each of the magnetic heads. The linear tape recording / reproducing apparatus according to claim 5, wherein servo read elements are stacked on each of the magnetic heads. The linear tape recording / reproducing apparatus according to claim 6, wherein servo read elements are stacked on each of the magnetic heads.

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