JPH11259835A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the constitution of a device and to reduce the cost of the device by performing recordings with 2N pieces of magnetic heads which are to be simultaneously drivingly displaced by one piece of the laminated electrostrictive element attached to a rotary drum and drivingly displacing the laminated electrostrictive element based on the tracking error information obtained from the reproduced signal of at least one piece of the 2N pieces of the magnetic heads at the time of reproduction. SOLUTION: Even numbered pieces of rotary magnetic heads H1, H2 are attached through a supporting member 40 to the other edge part of one piece of a laminated electrostrictive element 39 whose one edge part is fixed to an upper drum (rotary drum) Du so that the difference between heights of respective rotary magnetic heads is the prescribed one. As a result, a variation of the mutual height position between the rotary heads H1, H2 is never generated and, accordingly, it is possible that recording tracks having a recording pattern in which a variations is not present are easily recordingly formed on a magnetic tape and, moreover, it is possible to perform a satisfactory reproducing operation under a tracking control operation in which the rotary magnetic heads H1, H2 are used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical scan type magnetic recording / reproducing apparatus, and more particularly to a helical scan type magnetic recording / reproducing apparatus having a simple tracking control mechanism.

[0002]

2. Description of the Related Art A magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum is run at a predetermined running speed, and a recording / reproducing operation is performed using a rotating magnetic head. The helical scan type magnetic recording / reproducing apparatus thus configured has been widely used as a VTR. In the helical scan type magnetic recording / reproducing apparatus described above, as one means for achieving high-density recording, a pair of rotating magnetic heads provided with magnetic air gaps having opposite azimuth angles are 180 degrees. The upper drum provided at a symmetric position is rotated at a predetermined rotation speed, and
A magnetic tape that runs at a predetermined running speed in a state where the position of the reference edge of the magnetic tape that is obliquely wound around at least a part of the peripheral surface of the drum is regulated by a guide that is provided on the lower drum. Is sequentially and alternately helically scanned by the pair of rotating magnetic heads,
180 of each rotating magnetic head in a pair of rotating magnetic heads
Corresponding to the rotation every degree, sequential recording traces by a signal to be recorded are sequentially recorded and formed on the magnetic tape adjacent to each other, or recorded information in the recording traces is reproduced.

[0003] By the way, as for a home digital VCR (VCR) which enables helical scanning of a running magnetic tape with a rotating magnetic head and azimuth recording (reproduction) of digital data on the magnetic tape, there are many VTRs in various countries around the world. As a result of discussions at the "HD Digital VCR Council" in which manufacturers and
Standards have been established. According to the DVC standard, image information is highly efficiently compressed by various techniques such as discrete cosine transform (DCT), adaptive quantization, and variable-length coding, and digital data and audio information of the highly efficient compressed image information are compressed. Digital data, as an SD mode signal or an HD mode signal, a high efficiency compression mode to be applied when recording and reproducing on a magnetic tape, a configuration mode of recording data, a predetermined tape pattern, a physical property of the magnetic tape, The configuration mode and the like of the cassette are defined.

[0004] Data that has been subjected to a predetermined format in accordance with the DVC standard is a sync block formed by adding a SYNC word, an ID code, and a parity word (inner parity) for error correction encoding. A total of 10 image data (N
It is recorded in a state where it is divided into 12 recording traces (tracks) in the case of a TSC color video signal or 12 (in the case of a PAL color video signal).

[0005] Incidentally, helical recording and reproduction of signals in the SD mode of the DVC standard and recording and reproduction of HD mode signals in the DVC standard using a multi-segment recording and reproduction system, including a home digital VTR (VCR). In a scanning type magnetic recording / reproducing apparatus, a pattern of a recording mark (track pattern) formed on a magnetic tape according to a rotation locus of a rotating magnetic head drawn in a space by the rotating magnetic head is a diameter of a drum, a rotation of the rotating magnetic head. Number, the rotating direction of the rotating magnetic head, the running speed of the magnetic tape, the running direction of the magnetic tape, the track angle, the head track width, the recording area width of the magnetic tape, and the like. When the conditions such as running speed change, the rotating magnetic head drawn on the magnetic tape Pattern of rotational path is changed.

In a helical scan type magnetic recording / reproducing apparatus that performs high-density recording / reproducing by narrowing a recording track interval (track pitch), the precision of a magnetic tape traveling mechanism and the precision of magnetic tape feed control are controlled. As a result, the pattern of the rotation locus of the rotating magnetic head drawn on the magnetic tape changes, causing a decrease in the linearity of the recording trace, and the rotating locus of the rotating magnetic head intersects with the recording trace on the recorded magnetic tape. And the recorded signal recorded in the recording trace cannot be accurately reproduced. Therefore, the home digital VT by the multi-segment recording / reproducing method is used.
In the case of R (VCR), the problem is that the error rate deteriorates during compatible reproduction.

Therefore, in a helical scan type magnetic recording / reproducing apparatus for performing high-density recording / reproducing, the rotation locus of a rotary magnetic head is made to coincide with a recording trace on a recorded magnetic tape by a tracking control operation during a reproducing operation. In a conventional helical scan type magnetic recording / reproducing apparatus for home use, a control signal recorded in a region near the lower edge of a magnetic tape every rotation of an upper drum using a fixed head is used for tracking during a reproducing operation. A reproduction tracking system of a control track system (CTL system) used for the operation has been adopted. However, in the helical scan type magnetic recording / reproducing apparatus implementing the above-mentioned reproduction tracking method, an extra space required for installing a fixed head has hindered miniaturization of the apparatus.

In a home helical scan type digital magnetic recording / reproducing apparatus commercialized in recent years, during a recording operation, a tracking pilot signal is superimposed on digital data of a main signal such as video and audio. The recorded signal is recorded on a magnetic tape by a rotating magnetic head attached to the upper drum, and during a reproducing operation, a cross of a pilot signal reproduced from recording traces on both sides of the recording trace to be reproduced. An ATF (Automatic Tracking Finding) system in which a talk component is compared and a tracking operation of the rotary magnetic head is performed is adopted.

In the ATF system, the frequency f is applied to the recording traces on both sides of the recording trace where no pilot signal is recorded.
The recording trace where the pilot signal of frequency f2 is recorded and the recording trace where the pilot signal of frequency f2 is recorded, and the recording trace where the pilot signal of frequency f1 is recorded, Is a state in which two types of pilot signals, i.e., the pilot signal of f2, are alternately arranged every other recording trace. Now, assuming that a pilot signal having a frequency of f0 is recorded in a recording trace where no pilot signal is recorded, an arrangement state of pilot signals recorded in sequential recording traces will be described. 4 recordings such as a signal → a pilot signal having a frequency f1 → a pilot signal having a frequency f0 → a pilot signal having a frequency f2 → a pilot signal having a frequency f0 → a pilot signal having a frequency f1 → a pilot signal having a frequency f0. It is in an array state where it makes a round for each trace [see FIG. 4].

The tracking control at the time of a reproducing operation performed by using a reproducing rotary magnetic head having a head track width wider than the recording track width of the recording track recorded on the magnetic tape is performed by the above-mentioned reproducing control. In a state where the rotating magnetic head is tracking a recording trace where a pilot signal of frequency f0 is recorded, a pilot signal of frequency f1 recorded in recording traces adjacent to both sides of the recording trace and a pilot signal of frequency f2 are recorded. This is performed so that the signal level of the crosstalk component with the pilot signal becomes equal.

[0011]

An actuator of a tracking control system used for driving and displacing a rotating magnetic head so as to correctly track a recording mark of a recorded magnetic tape is an electromagnetic type or an electrodynamic type. Various types of electro-mechanical conversion elements having different operating principles, such as a (voice coil type) and an electrostriction (piezoelectric) type, have been conventionally proposed. Meanwhile, in a helical scan type magnetic recording / reproducing apparatus, one end is fixed to a rotating drum rotating at high speed, and the other end to which the rotating magnetic head is fixed is applied with centrifugal force. As a tracking control system actuator that needs to be driven and displaced, an electrostrictive (piezoelectric) type electro-mechanical conversion device is better than an electromagnetic type or electrodynamic (voice coil type) electro-mechanical conversion element. Elements are more suitable.

As a tracking control system actuator that drives and displaces a rotary magnetic head, a bimorph type or a laminated electrostrictive (piezoelectric) type electro-mechanical conversion element has been conventionally used. The electrostrictive (piezoelectric) type electro-mechanical transducer can provide a larger displacement than the electrostrictive (piezoelectric) electromechanical transducer of the stacked type, but has a rotating magnetic head fixed to it. In this case, the rotating magnetic head cannot be displaced in the width direction of the recording mark while the normal of the magnetic gap surface coincides with the normal of the magnetic tape surface. In addition, since a large hysteresis characteristic is exhibited in a displacement operation with respect to a change in an applied voltage, a problem arises in that a control operation in a small displacement range is not performed well. On the other hand, a laminated electrostrictive (piezoelectric) electro-mechanical transducer has a larger hysteresis characteristic in the displacement operation with respect to a change in applied voltage than a bimorph electrostrictive (piezoelectric) electro-mechanical transducer. Since it is not shown, a control operation in a minute displacement range can be favorably performed.

Now, as described above, the laminated electrostriction (piezoelectric)
Type electro-mechanical conversion element as an actuator of a tracking control system, and the rotating magnetic head attached to the actuator is favorably tracked on the recording mark of the recorded magnetic tape, thereby achieving a good high-density recording / reproducing operation. In the case where it is possible to realize this, an individual laminated electrostrictive (piezoelectric) electro-mechanical conversion element used as an individual actuator to which the above-mentioned individual rotating magnetic heads for reproduction are respectively attached. In the case where the recording operation is performed using the above-mentioned reproducing head also as the recording head, because there is a variation in the shape and dimensions, or there is a difference in the hysteresis characteristic of the displacement operation with respect to the change in the applied voltage, The recording trace pattern recorded on the recorded magnetic tape becomes a regular one having a predetermined recording trace interval (track pitch). Et al can happen no.

In order to prevent the above-mentioned problem from occurring,
Conventionally, for example, a rotating magnetic head provided directly fixed to a rotating drum is used as a rotating magnetic head for recording during a recording operation, and a rotating magnetic head for reproduction attached to an actuator is used during a reproducing operation, It has been practiced to cause the rotating magnetic head for reproduction to follow a recording mark of a recorded magnetic tape. However, in the above-described conventional problem solving method, the number of rotating magnetic heads used for the recording / reproducing operation increases, so that the configuration becomes complicated, the cost increases, and many other problems occur. Good solutions were sought.

[0015]

SUMMARY OF THE INVENTION According to the present invention, 2N (N) elements are simultaneously driven and displaced by one laminated electrostrictive element mounted on a rotating drum rotating at a predetermined specific rotation cycle.
.. Repeats an operation of simultaneously recording and forming 2N parallel recording marks obliquely in the longitudinal direction of a magnetic tape running at a predetermined running speed, based on individual recording information of 1, 2, 3... Means for obtaining a recorded magnetic tape having a predetermined recording trace pattern, and a tracking method obtained from a reproduction signal of at least one of the 2N magnetic heads in reproducing the recorded magnetic tape. Means for performing a tracking control operation of 2N magnetic heads by displacing and driving the laminated electrostrictive element based on error information.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of a magnetic recording / reproducing apparatus according to the present invention will be described below with reference to the accompanying drawings. FIG.
FIG. 1 is a block diagram showing a schematic configuration of an example of a magnetic recording / reproducing apparatus of the present invention. In FIG. 1, the detailed illustration of the drum rotation control system is omitted for simplicity of illustration. In FIG. 1, DA denotes a lower drum Dd having a guide portion (lead portion) for guiding a reference edge Te of the magnetic tape T.
And a rotating drum (upper drum) Du. In FIG. 1, reference numeral 36 denotes a drum drive motor;
Denotes a signal generator, and DPG and DFG indicate signals generated from the signal generator 37 described above. Also, H
Is a drawing symbol indicating a component configured with a plurality of rotating magnetic heads H1 and H2 (see FIG. 2) attached to the upper drum Du.

FIG. 2 shows an even number (two in FIG. 2) of the support member 40 fixed to the other end of one electrostrictive element 39 having one end fixed to the upper drum Du. In order to explain the state in which the rotary magnetic heads H1 and H2 are mounted so as to have a predetermined height difference, the upper drum Du
FIG. 3 is a view showing a part of the crushed state as a crushed state. The even number of rotating magnetic heads H provided on the support member 40 fixed to one laminated electrostrictive element 39 attached to the rotating drum Du rotating at a predetermined specific rotation cycle.
, H2,... Correspond to the even number of magnetic heads H1, H2,.
Has a predetermined recording trace pattern by repeatedly performing an operation of simultaneously recording and forming an even number of parallel recording traces obliquely in the longitudinal direction of the magnetic tape traveling at a predetermined traveling speed by the individual recording information according to the above. The even-numbered rotating magnetic heads H1, H2,... Are attached to the supporting member 40 so as to have a predetermined height difference so that a recorded magnetic tape can be obtained.

In the magnetic recording / reproducing apparatus shown in FIG.
Is an input terminal of a recording target signal such as an image signal and a sound signal to be recorded. Reference numeral 6 denotes a recording signal processing unit. The recording signal processing unit 6 converts a recording target signal supplied to the input terminal 5 into a digital signal during a recording operation, forms a DCT block, and performs a DCT operation process. , Quantization and variable length coding, addition of error correction code,
Other necessary signal processing is performed, and an insert information area (ITI) is recorded in each recording trace on the magnetic tape T.
Sector format), audio signal area (audio sector), video signal area (video sector), sub-code area (sub-code sector), and the like. However, in the above signal processing, the pilot signal having the frequency f1 and the frequency f2 are obtained from the code string itself recorded on the magnetic tape.
The signal processing including the 24-25 conversion is performed so that the pilot signal of the above is generated to generate the recording signal.

It should be noted that the above-mentioned recording signal processing unit 6
It may be configured to be able to generate SD mode signals and HD mode signals in the standard. Also,
When the signal supplied to the input terminal 5 is a digital signal, the recording signal processing unit 6 does not need to convert the recording target signal supplied to the input terminal 5 into a digital signal.
The recording signal generated by the recording signal processing unit 6 is transmitted to a subsequent circuit (in the configuration example shown in FIG. 1, first-in first-out memories 7 and 8, gate circuits 9 and 10, recording amplifiers 11 and 12,
The signals are supplied to the rotating magnetic heads H1 and H2 (when a specific rotating magnetic head is not designated, the reference numeral H is used) via a recording / reproducing changeover switch SW1 and the like.

Reference numeral 30 denotes a main control unit (system controller).
The main control unit 30 controls each component of the magnetic recording / reproducing apparatus, for example, the drum rotation control unit 31, a magnetic tape running speed and a running phase control system (in accordance with input information from an operation unit (not shown)). A control signal is supplied to a capstan control system), a head displacement drive circuit 33, various changeover switches, and others. The capstan control system 32 operates so that the magnetic tape runs at a predetermined tape running speed in a predetermined running direction according to the recording / reproducing operation mode.

During the reproducing operation, the rotating magnetic heads H1, H2
The reproduced signals simultaneously reproduced by the above are supplied to waveform equivalent circuits 15 and 16 via a recording / reproducing switch SW1 and reproduction amplifiers 13 and 14, and are supplied to the waveform equivalent circuits 15 and 1 described above.
After the waveform equalization is performed in step 6, the signals are supplied to code detection circuits 19 and 20 and phase locked loops (PLLs) 17 and 18 provided correspondingly. The code detection circuit 19 to which the clock signal extracted by the phase locked loop 17 is supplied and the code detection circuit 20 to which the clock signal extracted by the phase locked loop 18 is supplied include the clock Data is detected from the reproduced signal based on the signal. The detected data is stored as digital data in the digital memory of the reproduction signal processing unit 21. After the digital data of the digital memory is read at the read permission signal timing supplied from the main control unit 30, the digital data is converted into a bit stream arranged in series on the time axis,
Error correction signal processing is performed in the error correction circuit. Next, the digital data decoded and output by the variable length decoding unit is subjected to inverse DCT by an inverse DCT circuit and stored in a frame memory, and the digital data read from the frame memory is output. It is sent to terminal 38.

In the configuration example shown in FIG. 1, the digital data output from the code detection circuit 19 corresponding to the reproduction signal reproduced by the rotary magnetic head H1 is output from the tracking error signal processing section 22 (specific configuration). An example is shown in FIG. 3). In FIG. 3, reference numeral 22e denotes an f1 signal detector including a band-pass filter for extracting a pilot signal having a frequency of f1 and a detection circuit, and 22f denotes a band-pass filter and a detection circuit for extracting a pilot signal having a frequency of f2. F2 signal detector, 22g and 22H are operational amplifiers, 22I is a switch,
R1 to R3 are resistors.

In the tracking error signal processor 22, the digital data supplied to the input terminal 22b is converted to f
The pilot signal having the frequency f1 extracted by the one-signal detector 22e is supplied as a minuend signal to the operational amplifier 22g, and the pilot signal having the frequency f2 extracted by the f2 signal detector 22f is supplied to the operational amplifier 22g. The signal is supplied as a subtraction signal, and the output signal (f1 signal−f2 signal) from the operational amplifier 22g is supplied to the sample hold circuit 23 via the output terminal 22c. The sample and hold operation in the sample and hold circuit 23 is performed by a pilot sample signal supplied from the main control unit 30 to the sample and hold circuit 23. The output sampled and held by the sample and hold circuit 23 is output to a low-pass filter. 24 and the switch SW3,
It is supplied as a phase control signal to an addition circuit 25 in a control system (capstan control system) for the running speed and running phase of the magnetic tape. A speed control signal is supplied from the main control unit 30 to the addition circuit 25.

The control system (capstan control system) for the traveling speed and traveling phase of the magnetic tape includes the above-described addition circuit 25, capstan driving circuit 26, and capstan motor 27.
, A signal generator 28, and a speed detection circuit 29. The output signal from the capstan drive circuit 26 is supplied to a capstan motor 27 to Magnetic tape T sandwiched between pinch roller 34 and pinch roller 35
Is controlled to run at a predetermined running speed and running phase.

First, the case where the magnetic recording / reproducing apparatus performs the recording operation in the standard recording operation mode will be described as follows. The movable contacts v1, v of the recording / reproduction switch SW1 are supplied by the recording / reproduction switching signal supplied from the main control unit 30.
2 is switched to the fixed contacts R1 and R2. Further, the movable contact v of the changeover switch SW2 is switched to the fixed contact R side by the changeover control signal supplied from the main control unit 30,
Further, the switch SW3 is turned off. Since the movable contact v of the changeover switch SW2 is switched to the fixed contact R side, the head displacement drive circuit 33 is previously provided from the main control unit 30 via the fixed contact R of the changeover switch SW2 and the movable contact v. The specified voltage value is supplied,
In response, the head displacement drive signal output from the head displacement drive circuit 33 causes the laminated electrostrictive element 39
Causes the even number of rotating magnetic heads H1, H2,... To be set at a predetermined height in such a manner that each of them has a height difference corresponding to one recording trace interval (one track pitch).

When the magnetic recording / reproducing apparatus performs the recording operation in the standard recording operation mode, the switch SW3 is turned off by the control signal supplied from the main control unit 30, so that the running of the magnetic tape is performed. The speed and running phase control system (capstan control system) enters a state in which the magnetic tape runs at the reference speed determined by the reference speed signal supplied from the main control unit 30 to the adding circuit 25. The recording signal such as an image signal and a sound signal to be recorded, which is supplied from the input terminal 5 to the recording signal processing unit 6, is subjected to various kinds of signal processing as described above in the recording signal processing unit 6. When the recording data has a predetermined signal format, the pilot signal having the frequency f1 and the frequency f1 are obtained from the code string itself recorded on the magnetic tape.
The recording signal has been subjected to signal processing including 24-25 conversion so that two pilot signals can be generated. The recording signal is, for example, 10 frames per frame.
The recording signal is created in the recording signal processing unit 6 so as to be recorded in a book or 12 recording traces. In the following description, the recording signal is recorded in 10 recording traces per frame. It is described as being created as such.

FIG. 1 shows an embodiment of a magnetic recording / reproducing apparatus according to the present invention.
An even number of rotating magnetic heads H provided to be simultaneously driven and displaced by one laminated electrostrictive element 39 attached to a rotating drum Du rotating at a predetermined specific rotation cycle.
2 shows a magnetic recording / reproducing apparatus configured to correspond to the case where two rotating magnetic heads H1, H2 are used as illustrated in FIG. In the magnetic recording / reproducing apparatus shown in FIG. 1, the support member 40 fixed to one laminated electrostrictive element 39 attached to the rotating drum Du rotating at a predetermined specific rotation cycle is provided. .. Are wound around the outer peripheral surface of the rotary drum Du in a range of slightly more than half, and the two magnetic heads H1, H2. During the period during which the rotary magnetic heads H1 and H2 make a half turn (while the rotary drum makes a half turn), for example, during the period from time t1 to time t2 in FIG. # 1 and # 2 are simultaneously recorded and formed.

That is, from time t1 to time t2
During this period, the rotating magnetic head H1 records and forms the recording mark # 1 in FIG.
Forms the recording trace # 2 in FIG. 4 during the period from the time t1 to the time t2. During the period from time t1 to time t2, the two rotating magnetic heads H1, H
2, two parallel recording marks # 1, # recorded by
2 is a period of 回 転 rotation of the two rotating magnetic heads H1 and H2 after the simultaneous recording and formation on the magnetic tape T (a period during which the rotating drum rotates １ ／), that is, FIG. The period from the time t2 to the time t3 shown is a period in which the two rotating magnetic heads H1 and H2 are rotating without scanning the magnetic tape T, so that the two rotating magnetic heads H1 and H2 are rotated. Recording on the magnetic tape T by H2 cannot be performed.

The above-mentioned two rotating magnetic heads H1, H2
Therefore, the recording operation in the above-described recording mode performed on the magnetic tape T is performed according to the timing shown in FIG. 5 in accordance with the two first-in first-out memories 7, shown in FIG. 8 performs a write operation and a read operation, and the two gate circuits 9 and 10 shown in FIG. 1 perform opening and closing operations at timings shown in FIG. . The signal HID shown in FIG. 5 is a signal of the rotation cycle of the rotating drum Du, and is sent from the main control unit 30 as shown in FIG.

The data 1, 2, 3,..., 10 shown as data to be recorded in FIG. 5 are recorded by the recording signal processing unit 6 as described above. 10 shows a recording signal for each recording trace to be individually recorded. The recording target data 1, 2, 3,... 10 that are continuous on the time axis are written in the first-in first-out memory 7 during the first half rotation of the rotary drum Du. The data 2 to be recorded is written to the first-in first-out memory 8 during the next half rotation of the rotating drum Du, and is written alternately to the two first-in-first-out memories 7 and 8.

During the period from time t1 to time t2 in FIG. 5 corresponding to the period from time t1 to time t2 in FIG. 4, the data 1 to be recorded simultaneously read from the first-in first-out memories 7 and 8 are stored. , Data 2 to be recorded among 2
Is supplied to the recording amplifier 11 through the gate circuit 9 which is opened during the period from the time t1 to the time t2, and the recording target data 2 is stored in the gate circuit which is opened during the period from the time t1 to the time t2. The signal is supplied to the recording amplifier 12 through the circuit 10. The recording target data 1 amplified by the recording amplifier 11 is supplied to the rotary magnetic head H1 via the fixed contact R1 and the movable contact v1 of the recording / reproducing switch SW1, and the recording amplifier 1
2 is supplied to the rotating magnetic head H2 via the fixed contact R2 and the movable contact v2 of the recording / reproducing switch SW1, so that the recording target data 2 is amplified at time t1.
4 to time t2, the two rotating magnetic heads H1 and H2 are used to record two recording marks # in FIG.
1 and # 2 are simultaneously recorded and formed.

Similarly, as shown in FIG. 5, during the respective periods of time t1 to t2, time t3 to t4, time t5 to t6, time t7 to t8, and time t9 to t10, The two rotating magnetic heads H1 and H2 simultaneously record and form two recording marks parallel to the magnetic tape T.
During the respective periods of time t2 to t3, time t4 to t5, time t6 to t7, and time t8 to t9, the rotating magnetic head H
No recording operation on the magnetic tape T by 1 and H2 is performed.

As described above, one laminated electrostrictive element 39
According to a recording mode in which two parallel recording traces are simultaneously recorded and formed on the magnetic tape T by the two rotary magnetic heads H1 and H2 provided on the support member 40 fixed to the support member 40, 10 frames per frame. FIGS. 4 and 5 show an example of a case where a recording mark of a book is recorded and formed by a recording signal. FIG. 4 and FIG. Two rotating magnetic heads H1 and H1 are attached to a magnetic tape T running in a rotated state.
Since ten recording traces are recorded and formed by H2, the recording trace pattern recorded and formed on the magnetic tape T as described above causes the rotating magnetic heads H1 and H2 to be positioned 180 degrees symmetrically on the rotating drum Du. The two rotating magnetic heads H1 are arranged on the magnetic tape running while being wound around a little more than half of the outer circumference of the rotating drum Du during five rotations of the rotating drum Du. , H2, the recording trace pattern is the same as the recording trace pattern recorded on the magnetic tape T.

The two rotating magnetic heads H1 and H2 provided on the support member 40 fixed to the single laminated electrostrictive element 39 are sequentially used on the magnetic tape T by using them simultaneously. The magnetic air gap in the rotary magnetic head H1 is such that the recording trace pattern by two recording traces to be recorded indicates a close recording state (guard bandless state) where there is no non-recording part between adjacent recording traces. Is different from the azimuth angle of the magnetic gap in the rotating magnetic head H2, and the mounting height and head track width of the two rotating magnetic heads H1 and H2 are set. The two rotary magnetic heads H1 and H2 are used at the same time, so that the two magnetic heads H1 and H2 are sequentially recorded and formed on the magnetic tape T.
As shown in the sequential recording traces # 1, # 2, # 3,... Illustrated in FIG. They are recorded in a predetermined arrangement order.

The description so far made with reference to FIGS. 1 and 2 shows that 2N pieces (N is 1) to be provided on the support member 40 fixed to one laminated electrostrictive element 39 , 2, 3,...) (N = 1)
However, the number of rotating magnetic heads to be provided on the support member 40 fixed to one laminated electrostrictive element 39 in the embodiment of the present invention is four, six, eight. .., An arbitrary 2N (where N is 1, 2, 3,...) Rotating magnetic heads may be used. 2N mentioned above
The adjacent rotating magnetic heads have a height difference corresponding to one recording mark interval (one track pitch), and one stacked electrostrictive element 39 is set.
The 2N rotating magnetic heads described above are attached to a supporting member 40 fixed to the magnetic tape. The 2N rotating magnetic heads described above record two parallel recording marks obliquely in the longitudinal direction of a magnetic tape running at a predetermined running speed. The recording traces are simultaneously formed as recording traces having a predetermined recording trace pattern in a state where recording is performed by a rotating magnetic head having magnetic air gaps having different azimuth angles.

When 2N recording marks are simultaneously formed on the magnetic tape T by the 2N rotating magnetic heads, the configuration of the recording system shown in FIG. In correspondence with the number 2N of rotating magnetic heads used for simultaneous recording, 2N recording systems, that is, 1N
It is necessary to provide only 2N recording systems each composed of one first-in first-out memory, one gate circuit, one recording amplifier, and one recording / reproducing switch.

As described above, in the magnetic recording / reproducing apparatus of the present invention, any 2N (where N is 1, 2, 2) provided on the support member 40 fixed to one laminated electrostrictive element 39
3)) of the rotating magnetic heads, 2N parallel recording marks oblique to the longitudinal direction of the magnetic tape running at a predetermined running speed are converted into adjacent recording marks having different azimuth angles. In the conventional apparatus, a plurality of rotations are performed using a plurality of actuators in order to simultaneously form as a recording mark having a predetermined recording mark pattern in a state where recording is performed by a rotating magnetic head having a magnetic gap. There is no variation in the height position between the individual rotating magnetic head phases, which occurred when the position of the magnetic head was individually regulated, and therefore, the recording trace pattern having no variation on the magnetic tape T Can be easily recorded.

Next, a case where the magnetic recording / reproducing apparatus performs a reproducing operation in the standard reproducing operation mode will be described. The movable contacts v1 and v2 of the recording / reproducing switch SW1 are fixed to the fixed contact P by the recording / reproducing switching control signal supplied from the main controller 30.
1, P2 side, and the movable contact v of the changeover switch SW2 is switched to the fixed contact P side by the control signal supplied from the main control unit 30, and the switch S
W3 is turned on.

The two rotating magnetic heads H1 and H2 provided on the support member 40 fixed to one laminated electrostrictive element 39 are driven by a magnetic tape T running at a predetermined running speed.
Are simultaneously tracked, and a signal is reproduced from each of the recorded traces. A reproduced signal from the rotary magnetic head H1 is transferred to the movable contact v1 and the fixed contact P1 of the recording / reproducing switch SW1. And the reproduction signal from the rotary magnetic head H2 is supplied to the reproduction amplifier 14 via the movable contact v2 and the fixed contact P2 of the recording / reproducing switch SW1. The reproduction signal amplified by the reproduction amplifier 13 (see, for example, FIG. 8D and FIG. 9B) passes through the waveform equalization circuit 15 to the phase locked loop 17 and the code detection circuit 1.
9 and amplified by the regenerative amplifier 14 (see, for example, FIGS. 8 (e) and 9 (c)) through the waveform equalizing circuit 16 in a phase locked loop. 18 and the code detection circuit 20.

As described above, the above-described code detection circuit 1
The data detected at 9 and 20 is supplied to a reproduction signal processing section 21 where predetermined signal processing is performed to convert the reproduced video signal and audio signal to output terminals 38.
Is output to The data detected by the code detection circuit 19 during the reproduction operation is supplied to the tracking error signal processing unit 22 (see FIG. 3) via the input terminal 22b as described above. The tracking error signal output from the operational amplifier 22g of the tracking error signal processing unit 22 [FIG.
Is supplied from the output terminal 22c to the sample and hold circuit 23, and the operational amplifier (differential amplifier) 22H, the switch 22I, and the resistors R1 to R3 (where the resistors R1 and R3 are the same). The signal is supplied to the phase compensating circuit 32 via a signal polarity inverting circuit composed of a resistance value.

The aforementioned tracking error signal processing section 22
As shown in FIG. 6A, the tracking error signal (see FIG. 8A) output from the operational amplifier 22g is a pilot signal having a frequency f1 (f1 signal f1).
In the state where two types of pilot signals, that is, a recording trace where 1) is recorded and a pilot signal having a frequency of f2 (f2 signal f2), are alternately arranged every other recording trace, a recording trace is sequentially formed. In a state in which one rotating magnetic head is moving across a sequential recording mark on the recorded magnetic tape T, the two pilot signals (f1) reproduced from the one rotating magnetic head are described. signal,
The f2 signal) is obtained as a difference between the magnitudes of f1 and f2, and the change state of the tracking error signal is represented as illustrated in FIG. 6B.

That is, the head track width of the reproducing rotary magnetic head is set to be wider than the recording track width of the recording track recorded on the magnetic tape, and the reproducing rotary magnetic head has the frequency f0. When the recording trace where the pilot signal is recorded is accurately tracked, the f1 signal f1 recorded in the recording trace adjacent to both sides of the recording trace by the above-mentioned rotary magnetic head for reproduction is used. , F2 signal f
2 is reproduced with the same magnitude, so that the f1 signal f1 obtained from the rotating magnetic head tracking the recording trace (f0) where no pilot signal is recorded as described above, The tracking error signal obtained as the difference between the f2 signal f2 becomes zero as shown in FIG.

Also, when the rotating magnetic head for reproduction tracks the recording trace where the pilot signal of the frequency f0 is recorded, the rotating magnetic head for reproduction reproduces both sides of the recording trace. In a tracking state in which the crosstalk component between the pilot signal of frequency f1 recorded in the recording trace adjacent to and the pilot signal of frequency f2 is different, the recording trace where no pilot signal is recorded ( The tracking error signal (f1-f2) obtained as the difference between the f1 signal f1 and the f2 signal f2 obtained from the rotating magnetic head tracking f0) has a magnitude corresponding to the magnitude of the tracking deviation. I have.

The magnitudes of the two pilot signals f1 and f2 reproduced by one rotating magnetic head are as follows: (magnitude of pilot signal whose reproduced frequency is f2 ... magnitude of f2 signal)-(reproduction) When the calculated result is a tracking error signal (f2−f1) such as the magnitude of the pilot signal having the frequency f1..., The magnitude of the f1 signal), the tracking error signal (f2−f1) is obtained. It goes without saying that the signal has a polarity opposite to the polarity of f1-f2).

As is apparent from the above description, when the rotating magnetic head accurately follows the recording trace f0 where no pilot signal is recorded, the magnetic gap of the rotating magnetic head following the recording trace f0 is reduced. Both ends are
Since the recording track f0 protrudes by the same size in the recording traces on both sides of the recording trace f0, the rotary magnetic head records the pilot signal in the recording traces on both sides of the recording trace f0 where no pilot signal is recorded. The reproduction is performed in a state where the pilot signal having the frequency f1 and the pilot signal having the frequency f2 are equal. Therefore, when the rotating magnetic head accurately follows the recording trace f0 where no pilot signal is recorded, the tracking error signal becomes 0, but the position of the rotating magnetic head is shifted from the above state in the width direction of the recording trace. , A tracking error signal is generated in which the polarity and the magnitude are changed according to the direction and magnitude of the deviation.

That is, as described above, the change of the tracking error signal generated based on the pilot signal f1 having the frequency f1 and the pilot signal f2 having the frequency f2 extracted from the reproduction signal of one rotating magnetic head. The state corresponds to the displacement of the rotating magnetic head in a specific direction,
As shown in FIG. 6B, the tracking error signal is represented by a triangular wave having a period of four recording traces and a tracking error signal of "-polarity" when the rotating magnetic head is displaced in a specific direction. As shown in FIG. 6B, when the tracking error signal becomes 0 when a change is made as shown by a straight line rising to the right like “→→ 0 →“ + polarity ”, the state shown in FIG. (B) appears every four recording traces as indicated by a circle in the figure. Further, when the rotating magnetic head is displaced in a specific direction, the tracking error signal is represented by a straight line falling rightward in FIG. 6B, such as “+ polarity” → 0 → “−polarity”. During the change as shown, a state where the tracking error signal becomes 0 also appears every four recording traces.

As described above, the tracking error signal (f1-f2) generated based on the pilot signal having the frequency f1 and the pilot signal having the frequency f2 extracted from the reproduction signal of one rotating magnetic head is obtained. The signal is supplied from the output terminal 22c of the tracking error signal processing unit 22 to the sample-and-hold circuit 23, and is sent from the main control unit 30 to FIG.
After being sampled and held by the pilot sample signal supplied at the timing shown in FIG. 5, smoothed by the low-pass filter 24, and then turned on during the reproduction operation as described above. S
It is supplied as a running phase control signal to the addition circuit 25 via W3. As a result, the control system (capstan control system) for the traveling speed and traveling phase of the magnetic tape is sandwiched between the capstan 34 and the pinch roller 35 by the control operation of the closed circuit as described above. The magnetic tape T is controlled to run at a predetermined running speed and running phase.

The operational amplifier (differential amplifier) 22H supplied with the tracking error signal (see FIG. 8A) output from the operational amplifier 22g of the tracking error signal processing section 22 and the switch 22I. The above-mentioned switch 2 in the signal polarity inverting circuit configured
2I performs an on / off operation in response to a control signal [see FIG. 8B] supplied from the main control unit 30. And
By the on / off operation of the switch 22I, the polarity of the tracking error signal supplied from the output terminal 22d to the phase compensation circuit 32 is changed to a non-inverted state or an inverted state [FIG. )reference]. The period of the reversal of the polarity of the tracking error signal is determined by the rotating magnetic head H1 used to reproduce the reproduction signal used to extract the tracking error signal from the magnetic tape T by the magnetic tape T. Is a period for scanning twice.

The phase compensation circuit 32 to which the tracking error signal output from the output terminal 22d of the tracking error signal processing section 22 is supplied performs phase compensation on the tracking error signal to generate a tracking control signal. The tracking control signal is supplied from the phase compensation circuit 32 to the head displacement drive circuit 33 via the fixed contact P and the movable contact v of the changeover switch SW2. The head displacement drive signal output from the head displacement drive circuit 33 deforms the multilayered electrostrictive element 39 and is provided on the support member 40 fixed to the multilayered electrostrictive element 39.
N (where N is 1, 2, 3,...) Rotating magnetic heads are simultaneously displaced in the width direction of the recording trace on the magnetic tape. As a result, the 2N (where N is 1, 2, 3,...) Rotating magnetic heads are controlled so that all of them are tracking the recording trace well.

As is apparent from the above description, in the magnetic recording / reproducing apparatus of the present invention, the signal is generated based on the two pilot signals extracted from the reproduced signal of the rotating magnetic head by the tracking control method of the ATF method. The magnetic tape clamped between the capstan 34 and the pinch roller 35 by a control operation of a closed loop circuit for controlling the traveling speed and traveling phase of the magnetic tape (capstan control system) based on the tracking error signal. By controlling T to run at a predetermined running speed and running phase, the two rotating magnetic heads H during the reproducing operation are controlled.
1 and H2 are tracked to the recording trace of the recorded magnetic tape T, and the head generates a tracking control signal generated based on the tracking error signal output from the output terminal 22d of the tracking error signal processing unit 22. The displacement drive circuit 33 supplies a head displacement drive signal to the multilayer electrostrictive element 39 as a head displacement drive signal to deform the same, and the two rotations provided on the support member 40 fixed to the multilayer electrostrictive element 39. At the same time, the magnetic heads H1 and H2 are
By controlling the magnetic tape to be displaced in the width direction of the recording trace of the magnetic tape, the two rotating magnetic heads H1 and H2 are made to follow the recording trace.

Accordingly, in the magnetic recording / reproducing apparatus of the present invention, the recording trace pattern of the recorded magnetic tape T to be reproduced has, for example, as shown in FIG. , The two rotating magnetic heads H1 and H
2 can perform the reproducing operation while tracking the recording trace very well, so that the output waveforms of the reproducing amplifiers 13 and 14 are as shown in FIGS. 9 (b) and 9 (c). It can be in a good state, but if the tracking control operation performed during the reproducing operation is only the ATF tracking control operation as in the conventional magnetic recording / reproducing apparatus, the recording is completed. Magnetic tape T
Since the tracking control operation in a state where the rotary magnetic heads H1 and H2 follow the curve of the recording trace cannot be performed, the recording trace pattern of the recorded magnetic tape T to be reproduced is changed as shown in FIG. In the case where the recording track has a bend or an uneven track pitch as illustrated in FIG. 8, the output waveforms from the reproducing amplifiers 13 and 14 are illustrated in, for example, (d) and (e) of FIG. It will be something like this.

In the above description, the reproducing operation is performed with the recorded magnetic tape running at the same running speed as that of the magnetic tape during the recording operation. The reproducing operation may be performed in a state where the traveling speed of the recorded magnetic tape is different from the traveling speed of the magnetic tape during the recording operation. For example, in the case where the reproducing operation is performed with the traveling speed of the recorded magnetic tape during the reproducing operation being twice the traveling speed of the magnetic tape during the recording operation, the same configuration is provided at a position on the upper drum that is 180 degrees opposite. By installing a pair of heads or by performing the tracking control operation by doubling the number of revolutions of the upper drum, it is possible to reproduce the data of all the recording traces of the magnetic tape recorded at double speed at double speed. .

In implementing the magnetic recording / reproducing apparatus of the present invention, an arbitrary 2N (where N is 1, 2, 3,...) Number of rotating magnetic heads traveling at a predetermined traveling speed is used. A predetermined recording in a state in which 2N parallel recording marks obliquely extending in the longitudinal direction of the tape are formed by a rotating magnetic head having magnetic gaps having different azimuth angles without adjacent recording marks being provided with a gap. In a state where recording marks having a trace pattern can be formed simultaneously,
Support member 40 fixed to the plurality of laminated electrostrictive elements 39
Is a preferred embodiment, but an arbitrary number of 2N (where N is 1, 2, 3,...) Rotating magnetic heads are arranged in a longitudinal direction of a magnetic tape running at a predetermined running speed. A predetermined recording mark pattern is formed in such a state that two 2N recording marks obliquely adjacent to each other are formed by a rotating magnetic head having magnetic gaps having the same azimuth angle, with recording marks adjacent to each other with a gap therebetween. A configuration may be adopted in which a recording member is provided on the support member 40 fixed to one laminated electrostrictive element 39 in such a state that recording marks can be simultaneously formed.

[0054]

As is apparent from the above description, the magnetic recording / reproducing apparatus of the present invention has an optional 2N provided on a supporting member fixed to one laminated electrostrictive element.
Using a number (where N is 1, 2, 3,...) Of rotating magnetic heads, simultaneously forming 2N parallel recording marks obliquely in the longitudinal direction of a magnetic tape running at a predetermined running speed. Therefore, in the conventional apparatus, a plurality of actuators are used to individually regulate the positions of the plurality of rotary magnetic heads, and the height between the individual rotary magnetic head phases is increased. The recording position of the recording trace pattern having no variation can be easily recorded and formed on the magnetic tape T, and the tracking control operation using the rotary magnetic head described above can be easily performed. In the following, a good reproducing operation is performed, and according to the present invention, the above-mentioned conventional problems can be solved well.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a diagram showing a mounting mode of a rotary magnetic head of the magnetic recording / reproducing apparatus of the present invention.

FIG. 3 is a block diagram illustrating a configuration example of a tracking error signal processing unit.

FIG. 4 is an explanatory diagram of a recording trace and a pilot signal arrangement.

FIG. 5 is a timing chart for explaining the operation.

FIG. 6 is an explanatory diagram of a recording trace, a pilot signal arrangement, and a tracking error signal.

FIG. 7 is a diagram for explaining track bending.

FIG. 8 is a diagram for explaining tracking control.

FIG. 9 is a diagram for explaining tracking control.

[Explanation of symbols]

Dd: lower drum, Du: upper drum, DA: drum structure,
T: magnetic tape, Te: reference edge of magnetic tape T, H1,
H2: rotating magnetic head, SW1: recording / playback switch, S
W2: changeover switch, SW3: switch, 6: recording signal processing unit, 7, 8, FIFO, 9, 10, gate circuit, 1
1,12 ... recording amplifier, 13,14 ... reproduction amplifier, 1
5, 16 ... waveform equalization circuit, 17, 18 ... PLL, 19,
Reference numeral 20: code detection circuit, 21: reproduction signal processing unit, 22: tracking error signal processing unit, 22e: f1 signal detector,
22f ... f2 signal detector, 23 ... sample and hold circuit, 24 ... LPF, 25 ... addition circuit, 26 ... capstan drive circuit, 27 ... capstan motor, 28, 37 ...
Signal generator, 29: speed detection circuit, 30: main control unit, 3
DESCRIPTION OF SYMBOLS 1 ... Drum control part, 32 ... Phase compensation circuit, 33 ... Head displacement drive circuit, 34 ... Capstan, 35 ... Pinch roller, 36 ... Drum motor, 33 ... Head displacement drive circuit,
38 output terminal,

Claims (1)

[Claims] 1. 2N (N is 1, 2, 3,...) Magnetic heads simultaneously driven and displaced by one laminated electrostrictive element attached to a rotating drum rotating at a predetermined specific rotation cycle. By repeating the operation of simultaneously recording and forming 2N parallel recording marks obliquely in the longitudinal direction of the magnetic tape running at a predetermined running speed by the individual recording information according to the above, a recorded magnetic pattern having a predetermined recording mark pattern is repeated. A means for obtaining a tape; and, based on the tracking error information obtained from a reproduction signal of at least one of the 2N magnetic heads in the reproducing operation of the recorded magnetic tape, the laminated electrostriction. A means for performing a tracking control operation of 2N magnetic heads by displacing and driving the elements.