JPH1173604A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the magnetic recording and reproducing device of a helical scan type capable of recording and reproducing on the forward and backward ways. SOLUTION: In unrecorded areas remaining in between adjacent recording areas to be recorded sequentially alternately at the forward recording by a head H1 and a head H2 disposed opposite to each other at 180 degrees recording is executed at the backward recording by a head H3 and a head H4 or the head H3 and the head H4 with a head H5 and a head H6 disposed opposite to each other at 180 degrees, respectively. A signal in a period of one recording area on a tape in an input information signal of a reverse period of a prescribed time length set for tape traveling direction reversing operation is regarded as a unit of an information signal, and the information signal of the unit of odd number is stored in a 1st memory 40, while the information signal of even number is stored in a 2nd memory 41, and then the input information signal and the information signals read out of the memories 40 and 41 are changed and outputted by a switch 42. The information signal read out of the memories 40 and 41 respectively is used as the recording signal at the point when recording operation is resumed after reversing the traveling direction, and the input information signal is used as the recording signal after a lapse of a prescribed time from the resumed point.

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 capable of performing a reciprocating recording / reproducing operation without causing a signal loss during a reversal operation of a running direction of a magnetic tape.

[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 recording and reproducing operations are performed by a rotary magnetic head. The helical scan type magnetic recording / reproducing apparatus described above has been widely used as a VTR (VCR). 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 having magnetic air gaps having opposite azimuth angles, that is, A rotating magnetic head having a magnetic gap in which the azimuth angle of the magnetic gap is set at a predetermined angle of 90 degrees or less clockwise with respect to the width direction of the recording mark, and the azimuth angle of the magnetic gap in the width direction of the recording mark And a rotating magnetic head having a magnetic air gap set at a predetermined angle of 90 degrees or less counterclockwise.
The upper drum provided at the symmetric position of 0 degrees is rotated at a predetermined rotation speed, and 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 moved to the lower drum. The magnetic tape traveling at a predetermined traveling speed while being regulated by the provided guide portion is sequentially and alternately helically scanned by the pair of rotating magnetic heads, and each rotation of the pair of rotating magnetic heads is performed. In accordance with the rotation of the magnetic head every 180 degrees, a sequential recording mark by a signal to be recorded is sequentially recorded on a magnetic tape in a state adjacent to the magnetic tape, or the recorded information in the recording mark is reproduced. ing.

As described above, a home digital VCR (VCR) which enables helical scanning of a running magnetic tape by a rotating magnetic head to record and reproduce azimuth data on the magnetic tape is used for recording and reproducing analog signals. In addition to being widely used worldwide as a VHS (registered trademark) home digital VTR (VCR) for performing digital recording, digital data is recorded on a magnetic tape by azimuth recording.
Regarding digital VCRs for home use that can be played back, the DVC standard established as a result of discussions at the "HD Digital VCR Council", in which many VTR-related manufacturers and research laboratories from around the world participated, High-efficiency compression of image information is performed by various techniques such as discrete cosine transform (DCT), adaptive quantization, and variable-length coding, and the digital data of the highly efficient compressed image information and the digital data of acoustic information are 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, physical characteristics of a magnetic tape, a configuration mode of a cassette, And so on, and its practical use is being promoted. In the helical scan type magnetic recording / reproducing apparatus described above, the position of the rotation locus of the rotary magnetic head drawn in the space by the rotary magnetic head is under the condition that the tilt angle of the rotary shaft of the rotary magnetic head does not change. Is always constant.

Incidentally, some magnetic recording / reproducing apparatuses (tape recorders) for audio signals have conventionally been provided with an auto-reverse mechanism for automatically performing reciprocating recording / reproducing operations. In the magnetic recording / reproducing apparatus, the normal cassette tape can be used in a state of being used as a so-called endless tape by using the above-mentioned auto reverse function. And in a state like a so-called endless tape,
If there is a VTR that can use a magnetic tape, it can be effectively used for purposes such as crime prevention, surveillance, education, and advertising. That is, a helical scanning type magnetic recording / reproducing apparatus configured to perform a continuous recording / reproducing operation by reciprocating a single magnetic tape,
For example, it can be used for presentations where the same contents are repeatedly reproduced and used, for security where it is desired to always be able to record the latest information, and many other usage modes.

However, in the helical scan type magnetic recording / reproducing apparatus, the recording trace pattern (track pattern) formed on the magnetic tape according to the rotation locus of the rotating magnetic head is based on the diameter of the drum, the number of rotations of the rotating magnetic head, and the number of rotations. Since it is determined by various conditions such as the rotation direction of the magnetic head, the traveling speed of the magnetic tape, the traveling direction of the magnetic tape, the track angle, the head track width, and the recording area width of the magnetic tape,
When a helical scan type magnetic recording / reproducing apparatus runs a magnetic tape by switching between a forward direction and a reverse direction, the rotation trajectory of the rotary magnetic head may be different due to a change in the running direction of the magnetic tape. (See FIG. 11). Therefore, configuring a helical scan type magnetic recording / reproducing apparatus having a normal configuration as a helical scan type magnetic recording / reproducing apparatus capable of performing a reciprocal recording / reproducing operation requires a tape recorder for an audio signal to perform reciprocal recording / reproducing. Unlike the case of being configured as an operation type, it cannot be easily realized.

That is, in order to perform a recording / reproducing operation by a helical scan type magnetic recording / reproducing apparatus, when the magnetic tape is run while switching the running direction between a forward direction and a reverse direction, the magnetic tape moves in the forward direction. The recording marks formed on the magnetic tape by the rotating magnetic head when traveling and the recording marks recorded on the magnetic tape by the rotating magnetic head when the magnetic tape travels in the crossing state ( 11 (see FIG. 11), it is clear that the recording signal recorded in the recording trace cannot be accurately reproduced from the rotating magnetic head when the reproducing operation is performed. In particular, a helical scan type digital magnetic recording / reproducing apparatus needs to be reproduced as a signal of a signal level which can be corrected. This is a great obstacle to the configuration of the magnetic recording / reproducing device.

By the way, when the recording operation for a long time is continued by the conventional general helical scan type magnetic recording / reproducing apparatus, the recording operation on one magnetic tape usually starts at the winding start end of the magnetic tape. Each time the recording operation on the magnetic tape is completed, another magnetic tape, a tape cassette, or the like is successively mounted on the magnetic recording / reproducing apparatus so that the recording operation is continued. Or rewind the magnetic tape recorded from the beginning of the winding to the end of the winding to the beginning of the winding and continue the recording operation from the beginning of the winding of the magnetic tape again. It is necessary to do.

As a helical scan type magnetic recording / reproducing apparatus capable of performing a reciprocating recording / reproducing operation without performing the above-mentioned complicated operations, a helical scan type magnetic recording / reproducing apparatus of the Philips V2000 type has conventionally been used. As described above, the recording area of the magnetic tape is divided into upper and lower stages in the width direction of the tape so that the signal recording operation for the two divided recording areas is performed in series on the time axis. , Japanese Patent Laid-Open No. 50-853
As in the helical scan type magnetic recording / reproducing apparatus disclosed in Japanese Patent Application Publication No. 16-216, each of the forward and backward paths of the magnetic tape reciprocatingly traveling for reciprocal recording corresponds to the rotational locus of the rotating magnetic head. Various proposals have been made such that a recording mark recorded on a magnetic tape is formed in a comb shape on a running magnetic tape.

[0009]

SUMMARY OF THE INVENTION By the way, helical
When the reciprocating recording operation is performed by the scan type magnetic recording / reproducing apparatus, the magnetic tape is traveling at a predetermined traveling speed in the forward direction (forward direction) under the control of the capstan control system during the outward recording. Also, at the time of return travel recording, under the control of the capstan control system, after the traveling direction is changed in the reverse direction (the traveling direction is reversed), the vehicle is driven in the reverse direction at a predetermined traveling speed. Thus, the traveling direction of the magnetic tape at the time of forward pass recording and at the time of backward pass recording is sequentially changed (reversed) alternately in the forward direction and the reverse direction.

The reversing operation of the running direction of the magnetic tape at the time of the reciprocal recording operation is performed by first detecting the reversal position information of the running direction from the magnetic tape, and operating the capstan control system to operate the magnetic tape. After the running is stopped, the running direction of the magnetic tape is reversed, and the magnetic tape is run in the running direction opposite to the running direction up to that time. The operation of reversing the running direction of the magnetic tape, which is performed when changing between the reciprocating recording operation and the returning recording operation, is performed instantaneously, and the magnetic tape always runs at a predetermined running speed even if the running direction is reversed. In this state, even when the reciprocating recording operation is performed, the recording can be performed on the magnetic tape in a state where the signal to be recorded does not drop.

However, the operation of the mechanical components such as the capstan motor provided in the capstan control system used for the running operation of the magnetic tape is performed due to the inertia of the mechanical components. For example, the operation of reversing the running direction of the magnetic tape requires about 0.5 seconds. Also, even if the running direction of the magnetic tape is changed, the mechanism used to control the angle between the rotation locus of the rotary magnetic head and the reference edge of the magnetic tape to be the same predetermined angle. For the operation, for example, a time of about 0.5 seconds is required. Then, even if the control operations described above are performed simultaneously, the magnetic tape is reversed from the specific one direction from the point of the recording operation in the running state of the magnetic tape in one specific direction. It takes about 0.5 to 1 second to change to the traveling state in the traveling direction and start the recording operation.

Since it is impossible to record a recording signal on the magnetic tape during the above-mentioned time, the recording signal is lost during the period required for the reversal operation of the running direction of the magnetic tape. Will be. As a means for solving the above problem, Japanese Patent Application Laid-Open No. 9-63153 discloses a helical scan type magnetic recording / reproducing apparatus configured to perform a reciprocal recording operation, even during a reversal period of a running direction of a magnetic tape. Although a technical matter has been disclosed in which recording can be performed on a magnetic tape in a state where a recording signal is not lost, the technical means disclosed in this publication discloses a reversing operation of a running direction of a magnetic tape during reciprocal recording. In order to record / reproduce the signal during the period during which the signal cannot be recorded via the memory, the signal at a fixed interval of the input data is compressed and recorded / reproduced on the time axis. And the recording operation can be continued continuously. However, in order to implement the above solution, there is a problem in that a circuit configuration for performing the time axis compression / expansion of the signal becomes complicated and the frequency band of the recording signal is widened.

[0013]

According to the present invention, 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 attached to the upper drum. In the helical scan type magnetic recording / reproducing apparatus which performs recording / reproducing operation of the information signal to be recorded by the rotating magnetic head, the azimuth angle is 90 ° or less clockwise with respect to the width direction of the recording trace. A first rotating magnetic head having a magnetic air gap set at a predetermined angle, and a second rotating magnetic head having a magnetic air gap having the same azimuth angle as the first rotating magnetic head described above, At the same mounting height on the drum, they are arranged at 180-degree symmetrical positions about the center axis of the drum, and the azimuth angle is 90 degrees counterclockwise with respect to the width direction of the recording mark.
A third rotating magnetic head having a magnetic air gap set at a predetermined angle equal to or less than a degree is positioned at a predetermined minute interval in the circumferential direction of the drum with the first rotating magnetic head, In addition to the mounting height of the first rotary magnetic head, the mounting height is set so as to have a height difference corresponding to the interval between adjacent recording marks on the recorded magnetic tape, and the third magnetic head is mounted on the magnetic tape. A fourth rotating magnetic head having a magnetic gap of the same azimuth angle as the third rotating magnetic head at a position symmetrical with respect to the rotating magnetic head by 180 degrees about the center axis of the drum. ,
The third rotating magnetic head is provided at the same mounting height as that of the third rotating magnetic head, and the first rotating magnetic head is separated from the first rotating magnetic head by a predetermined distance in the circumferential direction of the drum. The head track has an azimuth angle different from the azimuth angle of any magnetic gap in the first to fourth rotating magnetic heads, and is 1/2 to 1/3 of the head track width of the first to fourth rotating magnetic heads. A mounting height such that a fifth rotating magnetic head having a magnetic gap of a width can be positioned so that the rotation trajectory can be positioned in a recording mark which is to be overwritten by the fifth rotating magnetic head. In addition,
With respect to the fifth rotating magnetic head, the fifth rotating magnetic head is located at a position symmetrical with respect to the center axis of the drum by 180 degrees.
An upper drum provided with a sixth rotating magnetic head having a magnetic gap having the same azimuth angle and head track width as the rotating magnetic head of the above-described fifth rotating magnetic head at the same mounting height as the fifth rotating magnetic head. Means for rotating at a specific rotation speed only in a predetermined specific rotation direction, and the angle between the rotation trajectory of each rotary magnetic head and the reference edge of the magnetic tape is such that the running direction of the magnetic tape is a forward direction. Means for controlling the same angle in the opposite direction even in the opposite direction,
While the magnetic tape is running in one specific direction, the first (or third) rotating magnetic head and the second (or fourth) rotating magnetic head sequentially record and form the magnetic tape. The magnetic tape is caused to travel at a predetermined traveling speed such that an unrecorded area having at least one recording mark width is formed between adjacent recording marks, and the magnetic tape is moved in a direction opposite to the specific direction. In the state in which the magnetic tape is traveling in the above-described specific direction, the first (or third) rotating magnetic head and the second (or fourth) rotating The third (or first) rotating magnetic head and the fourth (or fourth) magnetic head are positioned at an unrecorded area of at least one recording mark width formed between adjacent recording marks sequentially recorded by the magnetic head. 2) With the rotating magnetic head Means for running the magnetic tape at a predetermined running speed and running phase such that sequential recording marks are formed, and a tape reversing period of a predetermined time length set in advance for a reversing operation of the running direction of the magnetic tape. As for the input information signal, a signal having a time length corresponding to one recording trace period on the magnetic tape is taken as a unit information signal, and information of an odd-numbered unit in the information unit of a sequential unit serially arranged on the time axis Storing the signals sequentially in a first memory,
The information signals of the even-numbered units in the information signals of the sequential units serially arranged on the time axis are sequentially converted to second signals.
A signal switching means for switching between the input information signal and the information signal read from the first and second memories and outputting the signal, and a driving direction in the tape reversal period. At the time when the magnetic tape with the reversed is running at a predetermined running speed and the recording operation can be resumed, the information signal of the unit stored in the first memory and the information signal stored in the second memory are stored. Means for starting a read operation of reading the information signal in the unit having the predetermined time difference and causing the signal switching means to output the information signal read from each of the memories; and The first or third (or second or fourth) rotating magnetic head records the information signal of the unit read from the first memory on the magnetic tape and the second information signal.
Means for recording a unit of information signal read out from the memory on the magnetic tape by the fifth (or sixth) rotating magnetic head, and said means after a lapse of a predetermined time from the point in time when the recording operation is resumed during the tape reversal period. Means for using an input information signal as a recording signal by means of the signal switching means.

[0014]

FIG. 1 is a block diagram showing a schematic configuration of an example of a magnetic recording / reproducing apparatus according to the present invention. FIG.
In the magnetic recording / reproducing apparatus shown in FIG. 1, reference numeral 1 denotes an input terminal of a recording target signal such as an image signal and an audio signal to be recorded. Reference numeral 3 denotes a signal processing unit of a recording system and a reproduction system. The signal processing unit 3 of the recording system and the reproduction system includes a signal processing unit 37 for a tape running direction inversion period and a recording and reproduction signal processing unit 45. Have. The signal processing unit 37 in the tape running direction reversal period in the signal processing unit 3 of the recording system and the reproduction system includes, for example, a recording / reproduction switch 38, a timing signal generator 39, and the like as shown in FIG. ,
Memories 40 and 41 and signal path changeover switches 42 and 4
3 and a reproduction signal selection switch 44.

Signal processing unit 37 during the tape running direction reversal period
When the magnetic recording / reproducing apparatus performs a reciprocal recording operation, the switching control signal generated from the timing signal generator 39 is changed based on a control signal supplied from the main control unit (system control) 5 to perform recording / reproducing switching. The switch 38, the signal path changeover switches 42 and 43, and the reproduction signal selection switch 44, and the memory write / read timing signals generated by the timing signal generator 39 are supplied to the memories 40 and 41. I do. Accordingly, the signal processing unit 37 in the tape running direction inversion period, when the running direction of the magnetic tape is changed from the forward direction to the reverse direction, or when the running direction of the magnetic tape is changed from the reverse direction to the forward direction,
During a preset tape running direction reversal period, a signal processing operation as described below is performed so that a signal drop substantially does not occur in a recording signal recorded on the magnetic tape.

When the recording signal to be recorded on the magnetic tape T by the rotary magnetic head H is an analog signal, the recording / reproducing signal processing section 45 in the recording / reproducing signal processing section 3 is, for example, a frequency-reproduced signal. Generates and outputs a recording signal in the form of an analog signal of a modulated wave signal, and
When the recording signal to be recorded on the magnetic tape by the rotating magnetic head is a digital signal, the recording target signal supplied to the input terminal 1 during the recording operation is converted into a digital signal, and then a DCT block is formed and a DCT operation is performed. , Quantization and variable-length coding, addition of an error correction code, and other necessary signal processing to perform
Record information for each book has an insert information area, audio signal area,
The recording data is output as a recording signal as recording data of a signal format in a state of being divided into respective areas such as a video signal area and a subcode area. The recording signal is supplied to the rotating magnetic head via a head switch.

The main control unit (system controller) 5
For example, a microprocessor, a read-only memory (R
AM), a memory including a read only memory (ROM) and the like can be used. The main control unit 5 controls various components of the magnetic recording / reproducing apparatus, for example, the drum rotation control unit 6, a magnetic tape traveling speed and a traveling phase control system (capacity) in accordance with input information from an operation unit (not shown). A control signal is supplied to the stun control system 32, the drum tilt control unit 8, and the like to control the operation of each of the components described above. The main controller (system controller) 5 causes the magnetic tape T to record an inversion signal of the running direction of the magnetic tape at the time of the first outward recording operation.

The reverse signal of the running direction of the magnetic tape is the control head 4 illustrated in FIG.
7, the pulse width (or duty cycle) of the control signal CTL recorded on the control track of the magnetic tape T is different from other control signals CTL, such as CTLa and CTLb in FIG. You may. Note that, as in the above example, a reverse signal of the running direction of the magnetic tape may be recorded in a recording mark formed by the rotating magnetic head without using a fixed control head.

The drum rotation control unit 6 includes a drum rotation signal DFG generated by a drum frequency generator in a signal generator 11 mounted on a rotation shaft of a drum motor 7;
Based on the drum rotation phase signal DPG generated by the drum rotation phase signal generator, the rotating magnetic head (upper drum) is controlled to rotate at a predetermined rotation speed and rotation phase.
Further, the capstan control system 32 operates so as to cause the magnetic tape to run at a predetermined tape running speed in a predetermined running direction in accordance with forward and backward recording.

A drum tilt control unit (drum tilt control mechanism) 8 to which a control signal is supplied from the main control unit 5 is provided.
A magnetic tape running at a predetermined magnetic tape traveling speed in a forward direction (for example, the direction of arrow b shown in FIG. 1) or in a reverse direction (for example, the direction of arrow -b shown in FIG. 1) is provided with a rotating magnetic tape. The drum tilt control unit (drum tilt control mechanism unit) so that the angle formed between the rotation locus of the head H and the reference edge of the magnetic tape is the same as the reference track angle of the recording mark formed on the magnetic tape. (8) The center angle of the drum is inclined by the operation of (8).

A reproduced signal reproduced by the rotary magnetic head H during the reproducing operation is transmitted to a signal processing unit 3 of a recording system and a reproducing system.
Given to. When the reproduction signal reproduced from the rotating magnetic head H is an analog signal, the recording / reproduction signal processing unit 4 provided in the signal processing unit 3 of the recording system and the reproduction system described above.
5, after the demodulation operation and other predetermined signal processing are performed, the reproduction signal is sent to the output terminal 2 via the fixed contact Pa and the movable contact v of the reproduction signal selection switch 44, or the recording / reproduction switching is performed. Fixed contact P of switch 38 →
The movable contact v → fixed contact of the signal path changeover switch 42
T2 → the same movable contact v2 → the movable contact v2 of the recording / reproducing switch 43 → the same fixed contact R2 → the fixed contact Pb of the reproduction signal selection switch 44 and the movable contact v and are sent to the output terminal 2. The above-mentioned reproduction signal selection switch 4
The switching control signal 4 may be supplied from the main control unit 5 to the reproduction signal selection switch 44.

When the reproduced signal reproduced by the rotary magnetic head H is a digital signal, the recording / reproducing signal processing unit 45 provided in the signal processing unit 3 of the recording system and the reproducing system performs the above-described operation. After the reproduced signal is equalized in waveform by the waveform equivalent circuit, the digital data is stored in the memory via the code detection circuit and the phase locked loop (PLL). The digital data of the digital memory is
After being read at the read permission signal timing supplied from the main control unit 5, the bit stream is formed into a serial bit stream on the time axis, and the error correction circuit performs error correction signal processing. Next, the digital data output after the variable-length code has been decoded by the variable-length decoding unit,
The inverse DCT circuit performs the inverse DCT and stores the digital data in the frame memory. The digital data read from the frame memory is output to the output terminal 2 via the fixed contact Pa of the reproduction signal selection switch 44 and the movable contact v. Or the fixed contact P of the recording / reproducing changeover switch 38 → the same movable contact v → the fixed contact T2 of the signal path changeover switch 42 →
The movable contact v2 → the movable contact v2 of the recording / playback switch 43 →
It is sent to the output terminal 2 via the fixed contact Pb of the fixed contact R2 → the reproduction signal selection switch 44 and the movable contact v.

The frequency dividing circuit 33 of the control system (capstan control system) 32 for controlling the running speed and running phase of the magnetic tape, when the magnetic recording / reproducing apparatus performs the reciprocating recording / reproducing operation, makes the magnetic tape T operate at the normal running speed. (The same recording trace pattern as that recorded on the recorded magnetic tape in the state where the reciprocating recording operation has been performed,
A traveling speed that can be recorded and formed on the magnetic tape T by two rotating magnetic heads provided at 0-degree symmetric positions, for example, the rotating magnetic heads H1 and H2 in FIG. Output signal C of the frequency generator 10 attached to the rotating shaft of the capstan motor 9 for driving the capstan 30 to rotate.
The APFG is frequency-divided and supplied to the frequency-voltage converter 34.

The output signal from the frequency-to-voltage converter 34 is a speed control signal, and the tracking control signal supplied from the main control unit 5 is added to the speed control signal by an adding circuit 35 to form a driving circuit. The output signal from the drive circuit 36 is supplied to the capstan motor 9. As a result, the magnetic tape T sandwiched between the capstan 30 and the pinch roller 31
Is controlled so as to run at a predetermined running speed and running phase. Thus, the rotation locus of the rotary magnetic head H can form a recording trace pattern as shown in FIG. 5 (FIGS. 7 and 9) on the magnetic tape T. In FIG. 5 (FIGS. 9 and 7), A1, A2, B1, B2, C1,
C2... Indicate recording marks sequentially formed on the magnetic tape by the rotating magnetic heads having different azimuth angles of the magnetic gaps (note that A1, A2.
.., C1, C2,... Are also used in the following description to indicate the recording signals recorded on each of the recording traces described above).

As described above, the rotational locus of the rotary magnetic head H when the magnetic tape T is traveling in the forward direction and the rotational locus of the rotary magnetic head H when the magnetic tape is traveling in the reverse direction. 11 is completely different from that shown in FIG. 11, and the reciprocal recording / reproducing operation cannot be performed satisfactorily as it is. Therefore, the angle between the rotation locus of the rotary magnetic head H when the magnetic tape T is traveling in the forward direction and the reference edge of the magnetic tape, and the rotational magnetic head when the magnetic tape is traveling in the reverse direction. The angle formed between the rotation locus of H and the reference edge of the magnetic tape is controlled so as to always coincide with the predetermined track angle regardless of whether the running direction of the magnetic tape T is the forward direction or the reverse direction. Must be.

As described above, even when the running direction of the magnetic tape T is changed, the angle between the rotation locus of the rotary magnetic head H and the reference edge of the magnetic tape always coincides with the predetermined track angle. The components that perform the operation are:
The main controller (system controller) 5 and the drum tilt controller 8 in FIG. 1 are illustrated, and the system controller 5, the drum tilt controller 8 and the tilt correction mechanism in FIG. 3, and the mechanism shown in FIG. 4 are illustrated. I have. First, referring to FIG. 3, the rotation locus drawn on the magnetic tape T by the rotating magnetic head is controlled to be at an arbitrary predetermined angle with respect to the reference edge Te of the magnetic tape T, or the lead ring L
An outline of the configuration principle and operation principle of the tilt correction mechanism for making the position regulating surface G of r coincide with the movement locus of the running magnetic tape T will be described.

In FIG. 3, DB is a drum base, and a drum structure DA including an upper drum Du, a lower drum Dd, and a lead ring Lr is supported by the drum base DB. The upper drum Du is a drum structure D
A lower bearing Dd is fixed to the center axis of the drum assembly DA by a bearing (not shown) mounted on the center axis 12 of A in a rotatable manner with respect to the center axis of the drum assembly DA. Have been. The lead ring Lr, which functions as a guide for the reference edge Te (see FIG. 1) of the magnetic tape T, is formed separately from the lower drum Dd and is close to the outer peripheral portion 13 below the lower drum Dd. Further, the knife ring E (see FIG. 4) provided on the inner periphery of the lead ring Lr coaxially fits (not shown) with the lower protrusion of the lower drum Dd.

As illustrated in FIG. 3 (an exploded perspective view of a specific structure is shown in FIG. 4), the drum tilt control unit 8 includes a tilt drive motor (DD in FIG. 3) as a power source. Motor) 14, and reduction mechanisms 15, 16 including a plurality of gears,
It includes a rotary encoder 17, a position detector (preset sensor) 18, and the like. The tilt drive motor 14 shown by a block 14 in FIG.
It also includes a motor drive control circuit. As the above-described position detector 18, for example, one having a configuration in which an arc-shaped light shielding plate is moved in an optical path in which a light emitting element and a light receiving element are arranged to face each other may be used. The position detector 18 is configured such that the signal output from the position detector 18 at the moment when the arc-shaped light shielding plate is removed from the optical path in which the light emitting element and the light receiving element are arranged to face each other is the drum described above. It is used as information indicating the reference position of the center axis 12 of the structure DA and the reference position of the lead ring Lr.

Further, by knowing the amount of rotation of the light shielding plate from the reference position in the position detector 18 by measuring the number of output pulses from the rotary encoder 17, the reference position of the center axis 12 of the drum structure DA is determined. Direction and the amount of deviation from the reference position of the lead ring Lr can be obtained. The running direction and running speed of the magnetic tape T are controlled by the main control unit 5 according to various operation modes set in the main control unit (system controller) 5 of the magnetic recording / reproducing apparatus. The drum inclination control unit 8 to which the information is given,
The central axis 1 of the drum structure DA including the upper drum Du, the lower drum Dd, and the lead ring Lr in the drum structure DA.
2 in the direction of arrow 12a (or 12b) in FIG.
The screw 2 is tilted by a predetermined amount.
A control operation is performed so as to advance and retreat 6, 28.

The lead ring Lr is also tilted by a predetermined amount in a predetermined direction under the control of the drum tilt control unit 8, whereby the running direction of the magnetic tape is set to either the forward or reverse direction. Even in this case, the pattern of the rotation locus drawn on the magnetic tape T by the rotation locus of the rotating magnetic head is set to a state in which the track angle is determined, that is, the inclination is corrected, and the reference edge Te of the magnetic tape is moved. The guide portion G (position regulating surface) of the lead ring coincides with the trajectory.

First, in a state where the magnetic tape T is run in the forward direction (the direction of the arrow b in FIG. 1) at a predetermined running speed during a normal recording / reproducing operation, a predetermined rotation direction (see FIG. The lower drum Dd has a bottom surface protruding from the drum base DB when a rotating magnetic head driven and rotated at a predetermined number of rotations in the direction indicated by an arrow a in FIG. The four supporting points (see the supporting points 20, 20, 21, 21 in FIG. 4) are supported. Further, the lead ring Lr is formed to project from the lead ring Lr.
The rotation fulcrums (the rotation fulcrums 22, 22, 23, 2 in FIG. 4)
3 (see FIG. 3). Springs (springs 19, 24 and 25 in FIGS. 3 and 4) are mounted between the lead ring Lr and the drum base DB and between the lower drum Dd and the drum base DB, respectively. Are connected to each other in a predetermined connection state.

For example, when fast-forward playback (FF) is performed in the same running direction as the running direction of the magnetic tape during the recording operation, the screw 26 is driven so as to push up the bottom surface of the lower drum Dd. , The screw 28 is driven in a direction away from the bottom surface of the lower drum Dd, and two of the four rotation fulcrums (rotation fulcrums 20, 20) projecting from the drum base DB are rotated. The center axis of the upper drum Du and the lower drum Dd is rotated in the direction of the arrow 12a in FIG. 3 using the two rotation fulcrums as the rotation fulcrum in contact with the bottom surface of the lower drum Dd. You. When recording / reproduction is performed with the running direction of the magnetic tape reversed, the screw 2
8 is driven so as to push up the bottom surface of the lower drum Dd, and the screw 26 is driven in a direction away from the bottom surface of the lower drum Dd. Of two rotation fulcrums (rotation fulcrums 21, 21)
Is in contact with the bottom surface of the lower drum Dd, and the central axes of the upper drum Du and the lower drum Dd rotate in the direction of the arrow 12b in FIG. Is done.

The above-mentioned driving operation for the screws 26 and 28 is performed by the operation of the driving mechanism. The drive mechanism includes a motor 14 as a power source, a speed reduction mechanism including a plurality of gears, a position detector 18, a rotary encoder 17, and the like as shown in the exploded perspective view of FIG. ing. The traveling direction and traveling speed of the magnetic tape T correspond to various operation modes, and the main control unit 5 provided in the magnetic recording / reproducing apparatus.
In response to the setting, the drum inclination control unit 8 to which the control information is given from the main control unit 5,
, The center axis of the drum structure DA including the upper drum Du, the lower drum Dd (see FIG. 3), and the lead ring Lr,
The drive mechanism is controlled to advance and retreat the screws 26 and 28 so as to incline by a predetermined amount in the direction of the arrow 12a (or 12b) in FIG.

For example, fast forward reproduction (FF) in the same running direction as the running direction of the magnetic tape during the recording operation
Is performed, two of the four pivots protruding from the lead ring Lr (the pivots 2).
2, 22) are in contact with the bottom surface of the lower drum Dd, and the center axis of the lead ring Lr is rotated by a predetermined amount in the direction of the arrow 12a in FIG. The two screws 27 and 29, which are screwed into the lead ring Lr and are provided in such a state that their tips abut against the bottom surface of the lower drum Dd, are rotated in opposite directions.

Further, when recording and reproduction are performed by reversing the running direction of the magnetic tape, the read ring Lr
Of the four turning fulcrums protruding from the lower drum Dd, the two turning fulcrums of the four turning fulcrums come into contact with the bottom surface of the lower drum Dd. As a fulcrum, the lead ring Lr is screwed into the lead ring Lr so that the central axis of the lead ring Lr is turned by a predetermined amount in the direction of arrow 12b in FIG. The two screws 27 and 29 provided in contact with the bottom surface are rotated in opposite directions.

The above-mentioned driving operation for the screws 27 and 29 is also performed by the operation of the above-mentioned driving mechanism which operates under the control of the drum inclination control unit. In response to the traveling speed being set in the main control unit 5 provided in the VTR in accordance with various operation modes, the drum inclination control unit 8 to which the control information is given from the main control unit 5 , Lead Ring Lr
The drive mechanism is controlled so as to tilt by a predetermined amount in the direction of arrow 12a (or 12b) in FIG. 3, and the screws 27 and 29 are advanced and retracted. In the above description, in order to facilitate understanding of the operation, in order to facilitate the understanding of the operation, the tilting operation of the center axis of the drum assembly by the forward and backward operations of the screws 26 and 28 and the tilting operation of the central axis of the lead ring Lr by the forward and backward operations of the screws 27 and 29 are described. Were explained as if they were performed independently. However, the screws 26 to 29 described above are
The screw 28 and the screw 27 are simultaneously driven and rotated by a common power transmission mechanism, and the screw 28 and the screw 29 are simultaneously driven and rotated by a common power transmission mechanism. The operation of tilting the center axis of the drum structure by the operation and the operation of tilting the center axis of the lead ring Lr by the advancing and retreating of the screws 27 and 29 may be performed simultaneously.

In the magnetic recording / reproducing apparatus described with reference to FIGS. 3 and 4, the rotation trace surface of the rotary magnetic head coincides with the recording trace formed on the magnetic tape by a predetermined angle. The first tilt drive means for tilting the central axes of the upper and lower drums and the rotary magnetic head is provided separately from the upper and lower drums and at the lower portion of the lower drum. A position-regulating guide member (lead ring) Lr for a magnetic tape having a restricting surface G at a position of a reference edge of the magnetic tape, which is disposed close to the outer peripheral surface of the small diameter portion 13 (see FIG. 4); A second inclination driving means for inclining the position regulating guide member of the magnetic tape so as to coincide with the reference edge position of the magnetic tape,
By inclining the lower drum and the lead ring Lr having the position regulating surface G of the reference edge of the magnetic tape as required according to various operation modes, the recording formed on the magnetic tape is performed. The track of rotation of the rotary magnetic head is made to coincide with the trace, and the reference edge Te of the magnetic tape T can be guided well by the position regulating surface G of the lead ring Lr.

When the magnetic recording / reproducing apparatus performs a reciprocating recording / reproducing operation, a predetermined control signal is supplied from the main control unit 5 to the drum inclination control unit 8, so that the drum inclination control unit 8 Regardless of whether the magnetic tape is running in the forward direction or the magnetic tape is running in the reverse direction, the angle between the rotation trajectory of the rotating magnetic head and the reference edge of the magnetic tape is always the reference track. It can be made to match the angle.

Next, FIG. 2 is a diagram illustrating the arrangement of the rotary magnetic heads H1 to H6 which can be used in the magnetic recording / reproducing apparatus of the present invention. In FIG. A first rotating magnetic head having a magnetic gap having a predetermined angle of 90 degrees or less clockwise with respect to a width direction. H2 is a second rotating magnetic head H2 having a magnetic air gap of the same azimuth angle as the first rotating magnetic head H1, and the first and second rotating magnetic heads H1 and H2 are different from the upper drum. At the same mounting height, and at 180-degree symmetrical positions about the center axis of the drum.

H3 is a third rotary magnetic head having a magnetic gap whose azimuth angle is set to a predetermined angle of 90 degrees or less counterclockwise with respect to the width direction of the recording mark. The third magnetic head H3 is similar to the first magnetic head H3.
The recording marks adjacent to the recorded magnetic tape with respect to the mounting height of the first rotating magnetic head H1 are positioned at a predetermined minute interval in the circumferential direction between the rotating magnetic head H1 and the upper drum Du. Interval (1 recording trace interval ... 1
The mounting height is set so as to have a height difference corresponding to the track pitch Tp). With respect to the third rotating magnetic head H3, the center axis of the drum is symmetrical with respect to 1
At the symmetrical position of 80 degrees, there is provided a fourth air gap having the same azimuth angle as that of the third rotating magnetic head H3.
Is provided at the same mounting height as the third rotating magnetic head H3.

Further, the first rotating magnetic head H
The first to fourth positions described above are located at positions spaced apart from each other by a predetermined distance in the circumferential direction of the upper drum Du.
Of the rotating magnetic heads H1 to H4 have an azimuth angle different from the azimuth angle of any magnetic gap, and the first to fourth rotating magnetic heads H1 to H4 described above.
A fifth rotating magnetic head having a magnetic air gap having a head track width of about 1/2 of the head track width of the fifth rotating magnetic head H5 moves the rotation track of the fifth rotating magnetic head H5 to the first rotating magnetic head described above. The mounting height is set so as to be adjacent to the rotation locus of H1. H6 has the same azimuth angle and head track width as the fifth rotary magnetic head H5 at a position 180 degrees symmetric about the center axis of the drum with respect to the fifth rotary magnetic head H5. The sixth rotating magnetic head H6 is provided with the same mounting height as that of the fifth rotating magnetic head H5. The rotating magnetic heads H1 to H6 illustrated in FIG.
In the arrangement mode of the fifth aspect, the fifth and sixth rotating magnetic heads
On a straight line that is orthogonal to a straight line connecting the intermediate position between the first and third rotating magnetic heads H1 and H3 and the intermediate position between the second and fourth rotating magnetic heads H2 and H4 and that passes through the center of the drum. It is arranged in.

Now, the magnetic recording / reproducing apparatus of the present invention will be described with reference to FIG.
When a forward magnetic recording (reproducing) operation is performed using a rotating magnetic head having an arrangement mode as exemplified in the following example, the capstan control system operates according to a control signal from the main control unit 5.
A predetermined traveling speed at the time of reciprocal recording (reproducing) operation of the magnetic tape T [only two rotating magnetic heads (for example, two rotating magnetic heads H1 and H2) provided at 180-degree symmetric positions of the upper drum Du]. Is used to form a track pattern in a state in which recording is performed in close contact with the magnetic tape, so that the running speed is twice the running speed of the magnetic tape. Control operation is performed so that

The main control unit 5 also provides the drum inclination control unit 8 with necessary control signals necessary for the outward recording (reproduction) operation. As a result, the drum inclination control unit 8 sets the reference edge Te of the magnetic tape T traveling at a predetermined traveling speed in the forward direction,
The position of the rotational trajectory of the rotary magnetic head is controlled so that the angle between the rotational trajectory of the rotary magnetic head and the rotational trajectory becomes a predetermined track angle.

In the magnetic recording / reproducing apparatus of the present invention,
At the time of the outward recording (reproducing) operation, the magnetic tape T moves from the forward traveling state during the outward recording (reproducing) operation to the reverse traveling state during the backward recording (reproducing) operation.
A predetermined period including a point at which the running direction is reversed is set as a tape running direction reversal period, and the first to sixth rotating magnetic heads H1 to H6 are used during the tape running direction reversal period. The recording / reproducing operation, which will be described later, is different from the recording / reproducing operation performed using the first to fourth rotating magnetic heads H1 to H4 during a period other than the tape running direction reversal period.

First, in the outward recording (reproducing) operation of the magnetic recording / reproducing apparatus of the present invention, during the recording / reproducing operation in a period other than the tape running direction reversal period, for example, the first rotating magnetic head H1 and the second rotating magnetic head H1, When a pair of rotating magnetic heads with the head H2 is used during the forward recording (reproducing) operation, the third rotating magnetic head H3 and the fourth rotating magnetic head H4 are used during the backward recording (reproducing) operation. 1
A pair of rotating magnetic heads are used, and conversely, a pair of rotating magnetic heads used in the outward recording operation are a third rotating magnetic head H3 and a fourth rotating magnetic head H4. , The pair of rotating magnetic heads used at the time of the backward recording operation are two rotating magnetic heads, a first rotating magnetic head H1 and a second rotating magnetic head H2. And the fifth and sixth rotating magnetic heads H
5, H6 is not used.

In the following description, in the forward path recording (reproducing) operation, a pair of rotating magnetic heads used in a recording / reproducing operation during a period other than the tape running direction reversal period are composed of a first rotating magnetic head H1 and a first rotating magnetic head. 2 rotating magnetic head H2
And a pair of rotating magnetic heads used at the time of the homeward recording operation is a pair of rotating magnetic heads H3 and H4. The description is given taking the case of a magnetic head as an example.

In the forward recording (reproducing) operation of the magnetic recording / reproducing apparatus of the present invention, the reciprocating recording (reproducing) operation in a period other than the tape running direction reversal period is performed as described above. 1) During the operation, the first rotary magnetic head H1 and the second rotary magnetic head H2 sequentially record marks A1, which are recorded on the magnetic tape T.
Of A2 and A3, the recording trace recorded on the magnetic tape T by the first rotating magnetic head H1 is A1 → A3 →, and the recording trace recorded on the magnetic tape T by the second rotating magnetic head H2 is A2, and the recording traces A1, A3,... Recorded on the magnetic tape T by the first rotating magnetic head H1, and the recording traces A2, recorded on the magnetic tape T by the second rotating magnetic head H2. Are arranged between the adjacent recording traces in the recording traces that are sequentially and alternately arranged, and an unrecorded area having a width of one recording trace is provided.

During the recording (reproducing) operation on the return path, the reciprocating recording (reproducing) operation in a period other than the tape running direction reversal period is performed by the third rotating magnetic head H3 and the fourth rotating magnetic head H3.
Of the sequential recording traces recorded on the magnetic tape T by the rotary magnetic head H4, the recording trace recorded on the magnetic tape T by the third rotating magnetic head H3 is B
1, B3..., And the recording trace recorded on the magnetic tape T by the fourth rotary magnetic head H4 is B2. 3. Fourth rotating magnetic head H
3 and H4, the recording traces B1, B2, B3,. The recording is performed at a location of an unrecorded area having a width of one recording trace provided between adjacent recording traces in the recording traces which are sequentially and alternately arranged.

In the reciprocating recording operation of the magnetic recording / reproducing apparatus of the present invention, the recording trace pattern formed on the magnetic tape T by the reciprocating recording operation during a period other than the tape running direction inversion period is, for example, as shown in FIG. It will be as illustrated. The recording marks A1, A2,... In FIG. 5 are recorded by the first and second rotating magnetic heads H1, H2 during the forward recording operation performed while the magnetic tape T is traveling in the forward direction (forward direction). The recording marks sequentially formed on the magnetic tape T are shown, and B1, B2,.
Are the recording marks sequentially formed on the magnetic tape T by the third and fourth rotating magnetic heads H3 and H4 during the backward recording operation performed while the magnetic tape T is running in the reverse direction. Is shown.

In the reciprocating recording operation of the magnetic recording / reproducing apparatus of the present invention, the magnetic tape T running in the forward and reverse directions
The recording trace pattern as exemplified in FIG. 5 can be formed by the control unit 5 from the capstan control system 32 during the forward printing operation and the backward printing operation.
The control signal supplied to the capstan control system 3
2 is the running state of the magnetic tape T (running direction, running speed,
A control operation is performed to bring the traveling phase) into a predetermined state, and a drum tilt control is performed by a control signal supplied from the control unit 5 to the drum tilt control unit 8 in each of the forward recording operation and the backward recording operation. This is because the unit 8 controls the position of the rotational trajectory of the rotary magnetic head so that the rotational trajectory of the rotary magnetic head always coincides with the predetermined track angle.

The operation of controlling the running state of the magnetic tape T by the capstan control system 32 under the control of the main controller 5 and the operation of controlling the position of the rotation locus of the rotary magnetic head by the drum inclination controller 8 are described. Is performed in the same manner as the recording operation when the magnetic recording / reproducing apparatus performs the reciprocating reproduction operation. In the reciprocating recording operation of the magnetic recording and reproducing apparatus of the present invention, the operation mode is changed from the forward recording (reproducing) operation mode to the backward recording (reproducing) operation mode, and the forward recording (reproducing) operation mode is switched to the forward recording (reproducing). The change of the operation mode to the operation mode is performed by detecting the turning point of the magnetic tape (not shown) (for example, detecting the turning point by optical detecting means, or detecting the turning point recorded in advance on the magnetic tape). The information of the turning point detected by the instruction signal detecting means) is supplied to the main control unit 5 to perform the control operation by the main control unit 5, and the main control unit 5 performs the above-described operation mode. In response to the change, a predetermined control signal is given to the capstan control system 32 and the drum tilt control unit 8, respectively. And a control unit 8, respectively to perform the control operation as described above.

In the reciprocating recording operation of the magnetic recording / reproducing apparatus, the outward recording operation performed with the magnetic tape T running in the forward direction and the return path performed with the magnetic tape T running in the reverse direction are performed. When the operation mode is changed to the recording operation, or from the backward recording operation performed while the magnetic tape T is running in the reverse direction, the operation is performed while the magnetic tape T is running in the forward direction. When the operation mode is changed to the forward recording operation, the magnetic tape T is temporarily stopped, and then is moved in the traveling direction opposite to the traveling direction up to that time.

Therefore, the state in which the magnetic tape T is traveling at a predetermined traveling speed required for the recording / reproducing operation in one specific direction and the direction necessary for the recording / reproducing operation in the direction opposite to the specific one direction is required. Until the vehicle travels at a predetermined traveling speed, a period in which the vehicle travels at a traveling speed (including a stop state) different from the predetermined traveling speed required for the above-described recording and reproducing operation is required. This period is a recording (reproduction) disabled period during which normal recording and reproduction operations cannot be performed. If the information signal to be recorded by the magnetic recording / reproducing apparatus is continuous on the time axis, the presence of the above-mentioned non-recordable period in the magnetic recording / reproducing apparatus may cause the magnetic tape to fail. In T, a part of the information signal to be recorded cannot be recorded, and the signal is lost.

FIG. 6A shows an information signal to be recorded by the magnetic recording / reproducing apparatus as an input signal, and A1, A2, A3,.
1, B2, B3,... Are information signals having a time length in which information signals in a continuous state on the time axis to be recorded are recorded in one recording mark formed on the magnetic tape T. (Information signals in units) are shown separately. FIG. 6 illustrates a state in which information signals A1, A2, and A3 in units are recorded by a forward recording operation on a magnetic tape traveling at a predetermined traveling speed required for recording and reproduction in the forward direction. Have been. In FIG. 6, it is assumed that the reversing operation of the running direction of the magnetic tape T has started at time t1.

In the non-recordable period from the time t1 to the time ta in FIG. 6B, when the recording operation of the magnetic recording / reproducing apparatus is changed from the state of the forward recording operation to the state of the backward recording operation. From the state in which the magnetic tape T is traveling at a predetermined traveling speed required for the recording / reproducing operation in the forward direction, after being stopped at the time t1, the traveling is started in the reverse direction to start the recording / reproducing operation. This is a period until time ta when the vehicle is traveling at a predetermined traveling speed, and as described above, the period is, for example, about 1 second. Further, the operation of the drum tilt control unit 8 performed in accordance with the operation of changing the running direction of the magnetic tape T is also performed during the above-mentioned recording disabled period from time t1 to time ta.

The input signals B1 and B supplied during the non-recordable period from the time t1 to the time ta.
2 and B3 cannot be recorded on the magnetic tape T as a matter of course, and the input signals B4, B5, B6... Therefore, the input signals B1, B2, and B3 supplied during the above-described non-recordable period are missing signals. Therefore, in the magnetic recording and reproducing apparatus of the present invention,
A tape reversal period (twice from time t1 to time t2) having a time length twice as long as the above-described non-recordable period from time t1 to time ta.
Until the reversal period), the information signals of successive units on the time axis in the tape reversal period are stored in memory, and the information signals in the tape reversal period stored in the memory are stored. By reading out the information signals of successive units on the time axis and recording the information signals on the magnetic tape T, the information signals during the above-mentioned non-recordable period can be recorded on the magnetic tape T without being lost. It is.

The above-described recording operation during the tape inversion period is performed by the signal processing unit 45 during the tape running direction inversion period provided in the signal processing unit 3 of the recording system and the reproduction system in FIG. It is performed by an appropriate operation. When the turning point of the magnetic tape (not shown) is detected by the detecting means of the turning point of the magnetic tape (the end of the magnetic tape T or another turning point) and the information is given to the main control unit 5, The control unit 5 gives a control signal to the drum inclination control unit 8 at time t1, and the operation of the drum inclination control unit 8 causes the rotation trajectory of the rotary magnetic head to move to a predetermined track angle during the recording (reproduction) operation on the outward path. The main control unit 5 supplies a predetermined control signal to a capstan control system (not shown) so as to change the position of the rotation trajectory of the rotary magnetic head. The control system performs an operation of causing the running direction of the magnetic tape T to run in a direction opposite to the running direction of the magnetic tape up to that time.

At time t 1, the tape reversal period starts, and the main control unit 5 sends a signal to the timing generator 39 in the signal processing unit 45 of the tape running direction reversal period provided in the signal processing unit 3 of the recording system and the reproduction system. When the control signal is supplied, FIG.
The memory generated by the timing signal generator 39 during the tape reversal period (the period from time t1 to time t2... Reversal period) having a time length twice as long as the non-recordable period from time t1 to time ta. The first memory 40 sequentially stores the odd-numbered unit information signals in the sequential unit information signals that are continuous on the time axis during the tape inversion period according to the write timing signal of The first memory 41 sequentially stores even-numbered unit information signals in the sequential unit information signals that are continuous on the time axis during the tape reversal period.

The information signals stored in the first and second memories 40 and 41 are sequentially read in a predetermined manner in accordance with a memory read timing signal generated by the timing signal generator 39. Is read out. As the first and second memories 40 and 41, a memory having a function of independently performing a write operation and a read operation is used. Further, instead of two individual memories, two storage areas set in one memory may be used as the first and second memories 40 and 41.

The changeover switch 42 in the signal path to which the changeover control signal from the timing signal generator 39 is supplied during the tape inversion period is the input terminal 1 → recording / playback changeover switch 3
8, the information signal supplied to the movable contact v of the recording / reproducing switch 38 through the path from the movable contact v to the fixed contact T1 and the movable contact v1 of the switch 42 in the signal path.
And the movable contact v1 and the fixed contact R1 of the recording / playback switch 43.
Through the fixed contact T2 and the movable contact v2 of the signal path changeover switch 42, and the movable contact v2 and the fixed contact R2 of the recording / reproducing changeover switch 43. Supply to the processing unit 45,
Alternatively, the information signal read from the memory 40 is transmitted to the fixed contact m1 and the movable contact v1 of the signal path changeover switch 42,
The information signal read from the memory 41 is supplied to the recording / reproducing signal processing unit 45 via the movable contact v1 and the fixed contact R1 of the recording / reproducing changeover switch 43, and is transmitted to the fixed contact m2 of the changeover switch 42 in the signal path. The switching operation of a signal path to be supplied to the recording / reproducing signal processing unit 45 is performed via the contact v2, the movable contact v2 of the recording / reproducing switch 43, and the fixed contact R2.

Next, the operation of the signal processing section 37 during the above-described tape running direction reversal period will be specifically described with reference to a signal arrangement on the time axis illustrated in FIG. 6B.
The inversion period starts at time t1 at which the traveling of the magnetic tape T is stopped after the outward recording operation is completed. The movable contacts v1 and v2 of the changeover switch 42 of the signal path that has been switched to the fixed contacts T1 and T2 during the forward path recording operation are controlled by the switching control signal supplied from the timing signal generator 39. At time t1, the contacts are switched to the fixed contacts m1 and m2. At the time point t1, the timing signal generator 3
The information signal B1 of the unit of the input information signal is stored in the first memory 40 according to the write signal supplied from 9. The information signal B2 of the unit next to the information signal B1 of the unit described above is stored in the second memory 41.

Next, the unit information signal B3 is changed to the first signal by the write signal supplied from the timing signal generator 39.
The information signal B4 of the next unit is stored in the second memory 41. Similarly, the odd-numbered unit information signal B5 in the input information signal is stored in the first memory 40, and the even-numbered unit information signal B6 in the input information signal is stored in the second memory 41 [FIG. 6 (c) and (d)]. In this manner, the first memory 40 and the second memory 41 receive the input information signal continuously supplied on the time axis during the inversion period by the write signal supplied from the timing signal generator 39. , The information signal of every other unit in the information signal of the next unit is sequentially stored.

Therefore, the first and second memories 4
As shown in (c) and (d) of FIG. 6, each of 0 and 41 stores an information signal of 入 力 of all input information signals in the inversion period. First
The second two memories 40 and 41 store all the information signals in the inversion period including the unit information signals B1 and B3 in the above-described non-recordable period. If the information signals stored in the first and second memories 40 and 41 are appropriately selected and sequentially read out from the end of the non-recordable period and recorded on the magnetic tape T, The input information signal including the input information signal during the above-mentioned non-recordable period can be recorded on the magnetic tape T satisfactorily without causing the signal to be lost.

Next, the recording disabled period within the reversal period ends, and the magnetic tape T is running at a predetermined running speed at which the backward recording operation can be performed. When the recording operation is started, a read signal is supplied from the timing signal generator 39 to the first memory 40 at the time ta described above, whereby the information signal B1 of the unit stored in the first memory 40 is output. Is read out and recorded on the magnetic tape by the fourth rotating magnetic head H4. [FIG. 6 (e) shows information signals B1, B3 and B5 of the unit stored in the first memory 40, The timing for reading from the first memory 40 is shown]. The information signal B1 of the unit read from the first memory 40 is recorded via the fixed contact m1 and the movable contact v1 of the signal path changeover switch 42 and the movable contact v1 and the fixed contact R1 of the recording / reproducing changeover switch 43. After being supplied to the reproduction signal processing unit 45 and subjected to the predetermined signal processing in the recording / reproduction signal processing unit 45 to become the recording signal B1, the sixth rotating magnetic head H4 applies the magnetic tape T on the magnetic tape T in FIG. B1
Is recorded in the recording trace indicated by.

While the unit information signal B1 is being recorded on the magnetic tape T by the fourth rotary magnetic head H4, the read signal supplied from the timing signal generator 39 to the second memory 41 causes Second memory 4
The information signal B2 of the unit stored in 1 is read out,
The read information signal B2 in the unit described above passes through the fixed contact m2 and the movable contact v2 of the signal path changeover switch 42 and the movable contact v2 and the fixed contact R2 of the recording / reproducing changeover switch 43.
After being supplied to the recording / reproducing signal processing section 45 and undergoing predetermined signal processing in the recording / reproducing signal processing section 45 to be a recording signal C2 (= B2), the sixth rotating magnetic head H
6 is recorded on the magnetic tape T in a recording mark shown as C2 in FIG. 7 [FIG.
The information signals B2, B4, B6 of the unit stored in
The timing for reading from the second memory 41 is shown]. The sixth rotating magnetic head H6 is 1/1 of the head track width of the fourth rotating magnetic head H4.
Since it has a head track width of 2/3 (an example is shown in the figure), recording on the magnetic tape T is performed by the fourth rotating magnetic head H4. In a state where overwriting has been performed on a portion １ ／ to １ ／ (an example of （is shown in the figure) of the formed recording trace, C2 in FIG. It is recorded in the indicated record.

Next, the information signal B3 of the unit stored in the first memory 40 is read out, and the read signal is transmitted to the signal path changeover switch 42 and the recording / reproduction changeover switch 43 as described above. Then, after being supplied to the recording / reproducing signal processing unit 45, it is converted into a third recording signal B3,
As a result, the data is recorded on the magnetic tape T as a recording mark indicated by B2 in FIG. During the period when the unit information signal B3 is being recorded on the magnetic tape T by the third rotating magnetic head H3, the second read signal supplied from the timing signal generator 39 to the second memory 41 causes the second read signal. The information signal B4 of the unit stored in the memory 41 is read.

The unit information signal B4 read from the second memory 41 is supplied to the recording / reproducing signal processing unit 45 via the signal path changeover switch 42 and the recording / reproducing changeover switch 43, and the recording / reproducing signal After the recording signal C4 (= B4) after being subjected to predetermined signal processing in the processing unit 45,
The fifth rotating magnetic head H5 applies the magnetic tape T to FIG.
It is recorded on a recording trace indicated as C4 in the middle. The fifth rotating magnetic head H5 has a head track width of ２〜 to ３ of the head track width of the third rotating magnetic head H3 (1/2 is shown in the drawing). The recording marks formed on the magnetic tape T by the fourth rotary magnetic head H4.
/ 3 (an example of 1/2 is shown in the figure), and the magnetic tape T is overwritten with C4 in FIG.
It is recorded in the record mark shown as.

Hereinafter, similarly, the information signal B5 of the unit stored in the first memory 40 is read out and converted into a recording signal B5 by the recording / reproducing signal processing section 45, and the information signal B5 is output by the fourth rotating magnetic head H4. The information signal B6 of the unit recorded on the magnetic tape T as the recording trace B5 and stored in the second memory 41 is read out and converted into the recording signal C6 (= B6) by the recording / reproducing signal processing unit 45. Is recorded on the magnetic tape T by the sixth rotating magnetic head H6 as a recording mark C6.

At the time point t2 when the reading of the information signal B6 (= B6) in the above-described unit is completed, the inversion period ends, and the timing signal generator 39 supplies the switching control signal to the switch 42 in the signal path. As a result, the movable contacts v1, v2 of the changeover switch 42 in the signal path are switched to the fixed contacts T1, T2. Then, the recording / reproducing signal processing unit 45 supplies the information signals B7, B8,...
8, the fixed contact R → the same movable contact v → the fixed contact T1 of the signal path changeover switch 42 → the same movable contact v1 → the movable contact v1 of the recording / reproducing switch 43 → the path of the same fixed contact R1 and the input terminal 1 → The fixed contact R of the recording / reproducing switch 38 → the movable contact v → the fixed contact T 2 of the signal path switching switch 42 → the movable contact v 2 → the movable contact v 2 of the recording / reproducing switch 43 → the path of the fixed contact R 2. After that, it is supplied to the recording / reproducing signal processing unit 45.

As described above, in the reciprocating recording operation of the magnetic recording / reproducing apparatus, a special signal processing operation is performed during the reversal period, so that in the example of FIG. As shown, the information signals A1, A2, A3, B1 (and B2 = C2), B
3 (and B4 = C4), B5 (and B6 = C6), B
7, B8, B9,... Are recorded on the magnetic tape T by the information signals of the above-described sequential units.
Record marks shown in B7, A1, C6, B5, A
2, C4, B3, A3, C2, B1,... Are recorded and formed. Therefore, as illustrated in FIG. 7, all of the information signals supplied to the magnetic recording / reproducing apparatus during the period set as the inversion period of the tape running direction can be recorded on the magnetic tape T. .

When changing from the forward recording operation performed on the magnetic tape traveling in the forward direction to the return recording operation performed while the magnetic tape is traveling in the reverse direction, the recording cannot be performed in the non-recordable period. In the tape running direction inversion period set to the double time length, the special signal processing operation performed by the signal processing unit 37 in the tape running direction inversion period as described with reference to FIG. From the return recording operation performed on the magnetic tape
The same applies to a change to the outward recording operation performed with the magnetic tape running in the forward direction.
8A to 8G show special signals performed by the signal processor 37 during the tape running direction reversal period during the tape running direction reversal period when the recording operation on the return path is changed to the recording operation on the forward path. FIGS. 8A to 8G illustrate the processing operation, and FIGS. 8A to 8G illustrate the processing operation.
(G).

In FIG. 8, when the backward recording operation is completed,
When the reversal period starts at the time t1 when the running of the magnetic tape T stops, the fixed contact T
1, the switch 42 of the signal path that has been switched to the T side
The movable contacts v1, V2 are switched to the fixed contacts m1, m2 at the time t1 by the switching control signal supplied from the timing signal generator 39. At the time point t1, the write signal supplied from the timing signal generator 39 causes the information signal A of the unit in the input information signal to be changed.
1 is stored in the first memory 40. The information signal A2 of the unit next to the information signal A1 of the unit described above is stored in the second memory 4
1 [see (c) and (d) of FIG. 8].

Next, the unit information signal A3 is changed to the first signal by the write signal supplied from the timing signal generator 39.
And the next unit information signal A4 is stored in the second memory 41. Similarly, the odd-numbered unit information signal A5 in the input information signal is stored in the first memory 40, and the even-numbered unit information signal A6 in the input information signal is stored in the second memory 41 [FIG. 8 (c) and (d)). In this manner, the first memory 40 and the second memory 41 receive the input information signal continuously supplied on the time axis during the inversion period by the write signal supplied from the timing signal generator 39. , The information signal of every other unit in the information signal of the next unit is sequentially stored.

Therefore, the first and second memories 4
As shown in (c) and (d) of FIG. 8, each of 0 and 41 stores an information signal of １ ／ of all input information signals in the inversion period. The first
The second two memories 40 and 41 store all the information signals in the inversion period including the unit information signals A1 to A3 in the above-described non-recordable period. If the information signals stored in the first and second memories 40 and 41 are appropriately selected and sequentially read out from the end of the non-recordable period and recorded on the magnetic tape T, The input information signal including the input information signal during the above-mentioned non-recordable period can be recorded on the magnetic tape T satisfactorily without causing the signal to be lost.

Next, the recording disable period in the reversal period ends, and the magnetic tape T is running at a predetermined running speed at which the backward recording operation can be performed. When the recording operation is started, a read signal is supplied from the timing signal generator 39 to the first memory 40 at the time ta described above, so that the unit information signal A1 stored in the first memory 40 is output. Is read out and recorded on the magnetic tape by the second rotating magnetic head H2 [FIG. 8 (e) shows information signals A1, A3 and A5 of the unit stored in the first memory 40, The timing for reading from the first memory 40 is shown]. The unit information signal A1 read from the first memory 40 is recorded via the fixed contact m1 and the movable contact v1 of the signal path changeover switch 42 and the movable contact v1 and the fixed contact R1 of the recording / reproducing changeover switch 43. After being supplied to the reproduction signal processing section 45 and subjected to the predetermined signal processing in the recording / reproduction signal processing section 45 to become the recording signal A1, the second rotating magnetic head H2 applies the recording signal A1 to the magnetic tape T in FIG. A1
Is recorded in the recording trace indicated by.

During the period when the unit information signal A1 is being recorded on the magnetic tape T by the second rotary magnetic head H2, the read signal supplied from the timing signal generator 39 to the second memory 41 causes Second memory 4
The information signal A2 of the unit stored in 1 is read out,
The read information signal A2 in the unit described above passes through the fixed contact m2 and the movable contact v2 of the signal path changeover switch 42 and the movable contact v2 and the fixed contact R2 of the recording / reproducing changeover switch 43,
After being supplied to the recording / reproducing signal processing unit 45 and undergoing predetermined signal processing in the recording / reproducing signal processing unit 45 to produce a recording signal C2 (= A2), the sixth rotating magnetic head H
6, the data is recorded on the magnetic tape T in a recording mark indicated by C2 in FIG. 8 [FIG. 8 (f) shows the second memory 41].
The information signals A2, A4, A6 of the unit stored in
The timing for reading from the second memory 41 is shown]. The sixth rotating magnetic head H6 is 1/1 of the head track width of the second rotating magnetic head H2.
Since it has a head track width of 2,
The magnetic tape T is shown as C2 in FIG. 9 on the magnetic tape T in a state where it is overwritten on a half of the recording mark B3 recorded on the magnetic tape T by the third rotary magnetic head H3 described above. It is recorded in the recording trace that is.

Next, the information signal A3 of the unit stored in the first memory 40 is read out, and the read signal is transmitted to the signal path changeover switch 42 and the recording / reproduction changeover switch 43 as described above. Then, after being supplied to the recording / reproducing signal processing unit 45, the recording / reproducing signal processing unit 45 converts the signal into a recording signal A3 and outputs the recording signal A3.
1 is recorded on the magnetic tape T as a recording mark indicated by A3 in FIG. The above-described first rotating magnetic head H1
During the period in which the unit information signal A3 is being recorded on the magnetic tape T, the timing signal generator 39 outputs the second information signal A3.
The information signal A4 of the unit stored in the second memory 41 is read by the read signal supplied to the memory 41.

The unit information signal A4 read from the second memory 41 is supplied to a recording / reproducing signal processing unit 45 via a signal path changeover switch 42 and a recording / reproducing changeover switch 43. After being subjected to predetermined signal processing in the processing unit 45 to be a recording signal C4 (= A4),
The fifth rotating magnetic head H5 applies a magnetic tape T to FIG.
It is recorded on a recording trace indicated as C4 in the middle. Since the fifth rotating magnetic head H5 has a head track width that is の of the head track width of the first rotating magnetic head H1, the fifth rotating magnetic head H1 has the same structure as the first rotating magnetic head H1. Of the recording mark recorded on the magnetic tape T by the
In a state where the data is overwritten on the portion of / 2, it is recorded on the magnetic tape T in a recording mark indicated by C4 in FIG.

Thereafter, similarly, the information signal A5 of the unit stored in the first memory 40 is read out and converted into a recording signal A5 by the recording / reproducing signal processing section 45, and the recording signal A5 is outputted by the second rotating magnetic head H2. The information signal A6 of the unit recorded on the magnetic tape T as the recording trace A5 and stored in the second memory 41 is read out and converted into a recording signal C6 (= A6) by the recording / reproducing signal processing unit 45. Is recorded on the magnetic tape T by the sixth rotating magnetic head H6 as a recording mark C6.

At the time point t2 when the reading of the information signal A6 (= C6) in the above-described unit is completed, the inversion period ends, and the timing signal generator 39 supplies the switching control signal to the switching switch 42 in the signal path. As a result, the movable contacts v1, v2 of the signal path changeover switch 42 are switched to the fixed contacts T1, T2. Therefore, the recording / reproducing signal processing unit 45 includes:
After time t2, the information signals A7, A8,... Of the input information signal in a sequential unit are input terminal 1 → fixed contact R of the recording / playback switch 38 → movable contact v → fixed contact T of the signal path changeover switch 42. 1 → the same movable contact v1 → the path of the movable contact v1 of the recording / reproducing switch 43 → the fixed contact R1 and the input terminal 1 → the fixed contact R of the recording / reproducing switch 38 → the same movable contact v → the signal path switch 42 Through the fixed contact T2 → the same movable contact v2 → the movable contact v2 of the recording / reproducing switch 43 → the same fixed contact R2.

As described above, in the reciprocating recording operation of the magnetic recording / reproducing apparatus, a special signal processing operation is performed during the reversal period, so that the example shown in FIG. As shown, the information signals B1, B2, B3, B1 (and A2 = C2), A
3 (and A4 = C4), A5 (and A6 = C6), A
7, A8, A9,... Are recorded on the magnetic tape T by the information signals of the above-described sequential units.
Record marks shown in ... A7, C2, B3, A3, C
4, B2, A5, C6, B1, A7,... Therefore, as illustrated in FIG. 9, all of the information signals supplied to the magnetic recording / reproducing apparatus during the period set as the inversion period of the tape running direction can be recorded on the magnetic tape T. .

As is apparent from the above description, in the magnetic recording / reproducing apparatus of the present invention, during the reciprocal recording operation, when changing from the forward recording operation to the backward recording operation, and when switching from the forward recording operation to the backward recording operation. All input information signals of the tape running direction reversal period are included in the tape running direction reversal period set to a time length twice as long as the above-mentioned recording disabled period, including the information signals of the recording non-period period which cannot be avoided at the time of change. Are stored in the first and second memories 40 and 41, and all of the information signals of the odd-numbered units in the input information signal stored in the first memory and the second memory 4 are stored.
1 to the first to sixth rotary magnetic heads H1.
Since the recording is performed on the magnetic tape T using the six rotating magnetic heads H6 to H6, according to the reciprocating recording operation by the magnetic recording / reproducing apparatus of the present invention, the input information signal without any missing portion is recorded. A recorded magnetic tape in a recorded state can be created.

Next, according to the reciprocating recording operation mode of the magnetic recording / reproducing apparatus of the present invention described above, the information signals are reciprocatedly reproduced from the recorded magnetic tape T in which all of the input information signals are recorded. The case will be described. When the magnetic recording / reproducing apparatus performs a reciprocating reproducing operation, the magnetic tape is moved in the reverse direction from the forward (or backward) reproducing operation performed on the magnetic tape running in the forward (or reverse) direction. At the time of changing to the reproduction operation of the return path (or the forward path) which is performed while the vehicle is traveling in the forward (or forward) direction, it is necessary to consider that there is a reproduction impossible period having substantially the same time length as the recording impossible period. It is necessary to perform a reproducing operation.

That is, on the recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus, all the input information signals including the information signals in the non-recordable period are recorded. Recorded magnetic tape by a special recording operation during the reversal period of the tape running direction set to a double time length (input information signal during the reversal period is recorded for half the reversal period). The recorded contents per unit time in the above-described tape running direction reversal period are twice as long as the recorded contents per unit time in periods other than the tape running direction reversal period.

If the magnetic recording / reproducing apparatus used for the reciprocating reproducing operation has such a configuration that the operation of changing between the reproducing operation on the outward path and the reproducing operation on the backward path can be performed instantaneously, All the information signals recorded on the used magnetic tape can be correctly reproduced. However, since the magnetic recording / reproducing apparatus used for the reciprocating reproduction operation necessarily has a non-reproducible period, Playback operation cannot be performed. Thus, of the sequential unit information signals recorded on the recorded magnetic tape, of the sequential unit information signals within the inversion period, only 1/2 of the unit information signal is selectively reproduced. So that The method of selecting the information signal of the unit within the inversion period can be arbitrarily determined according to the information content of the information signal of the sequential unit.

Next, according to the reciprocating recording operation mode of the magnetic recording / reproducing apparatus of the present invention described above with reference to FIG. 10, information is recorded from the recorded magnetic tape T on which all the information signals of the input information signal are recorded. An operation example when a signal is reciprocally reproduced will be described. FIG. 10A shows an original information signal to be recorded as an array of information signals in units. FIG. 10B shows a recording state (reproduction pattern) of a signal on a recorded magnetic tape on which an information signal of a sequential unit is recorded by the reciprocal recording operation described above.
It is. FIG. 10C shows a rotating magnetic head used during a reproducing operation. 10 (d) and 10 (e) show the case where the information signals of all the sequential units in the input information signal are recorded in the recording mode as shown in FIG. 10 (b) by the reciprocating recording operation. FIG. 3 is a diagram illustrating a state in which an information signal is reproduced from a recorded magnetic tape T in a different reproduction mode.

When the magnetic recording / reproducing apparatus shown in FIG. 1 performs the reproducing operation, the switching generated by the timing signal generator 39 is performed based on the control signal supplied from the main control unit 5 to the timing signal generator 39. The movable contacts v1, v2 of the recording / reproducing changeover switches 37, 42 are switched to the fixed contacts P1, P2 side by the control signal, and the changeover control signal generated from the timing signal generator 39 is changed to the changeover switch 42 of the signal path. , The movable contacts v1 and v2 of the changeover switch 42 in the signal path are switched to the fixed contacts T1 and T2.

When the magnetic recording / reproducing apparatus of the present invention performs a reproducing operation in a forward reproducing operation mode as exemplified in FIG. 10D, the first rotating magnetic head H1 and the second rotating magnetic head H1 With the rotary magnetic head H2, reproduction signals A1, A2, and A3 are obtained from the sequential recording marks A1, A2, and A3 recorded on the magnetic tape T, and the third rotary magnetic head is used during the reproduction operation on the return path. By the head H3 and the fourth rotating magnetic head H4, reproduction signals B1, B3, B5, and B7 are obtained from the sequential recording traces B1, B3, B5, and B7 recorded on the magnetic tape T.

Further, the magnetic recording / reproducing apparatus according to the present invention
In the case of performing the reproducing operation in the forward reproducing operation mode as exemplified in FIG.
1 and the second rotary magnetic head H2, the sequential recording marks A1, A2, A3 recorded and formed on the magnetic tape T.
Signals A1, A2, and A3 are obtained from the first and second magnetic heads T3 and H4 during the return operation. Reproduction signals B1, B2, B4, B6 are obtained from the traces B1, C2, C4, C6. It should be noted that the fifth and sixth rotating magnetic heads H5, H6
When the reproduction signal is obtained from the recording traces of C2, C4, and C6 by using, the timing of reading from the memory is adjusted to match the position of the reproduction signal on the time axis.

The reproduction signal selection switch 44 shown in FIG. 1 directly outputs the reproduction output signal from the recording / reproduction signal processing section 45 with its movable contact v switched to the fixed contact Pa side. The output can be output to the output terminal 2 via the fixed contact Pa and the movable contact v of the reproduction signal selection switch 44. Further, the above-mentioned reproduction signal selection switch 44
In the state where the movable contact v is switched to the fixed contact Pb side, the reproduction output signal from the recording / reproducing signal processing unit 45 is transmitted to the first and second contacts via the fixed contact P of the recording / reproducing switch 38 and the movable contact v. To the memories 40 and 41, and reproduces the reproduced output signal from the recording / reproduced signal processing unit 45.
Are temporarily stored in the memories 40 and 41, and the reading modes for the first and second memories 40 and 41 are variously changed, so that the information signals in a desired unit are arranged on the time axis. The reproduced signal is transferred to the signal path changeover switch 4
2 via the fixed contacts m1 and m2 and the movable contacts v1 and v2 to the movable contacts v1 and v2 of the recording / reproducing switch 43, and from the fixed contact P1 of the recording / reproducing switch 43 to the reproduction signal selecting switch 44. Output can be made to the output terminal 2 via the fixed contact Pb and the movable contact v.

In the state where the movable contact v of the reproduction signal selection switch 44 is switched to the fixed contact Pb as described above, a reproduction signal is generated using the first and second memories 40 and 41. In this case, for example, the information signals B1, B2, B3, B4, B of the unit recorded on the magnetic tape T already recorded during the inversion period in FIG.
5 and B6 are sequentially reproduced using the first to sixth rotating magnetic heads, and then the running of the magnetic tape is stopped.
The information signals B1, B3, and B5 of the above-described units are converted into the first signals described above.
And the information signals B2, B4, and B6 of the reproduced units are sequentially stored in the second memory 4.
1 sequentially stored in the first and second memories 4 described above.
0, 41, the information signals B1, B2, B
3, B4, B5, and B6 are sequentially read out on the time axis.

Immediately after the unit information signal B6 is read,
It is also possible to adopt a reproduction mode in which the information signals B7, B9, B9,... Of the unit reproduced from the recorded magnetic tape running at a predetermined traveling speed are continuous with the information signal B6 of the unit. When a reproduction operation mode in which reproduction signal processing is performed using the first and second memories 40 and 41 is performed, the switching mode of the signal path changeover switch 42 is also suitable for the reproduction operation mode described above. It is natural to be done.

The fifth and sixth rotating magnetic heads H5, H5
H6 records an information signal by overwriting a part of a recording mark recorded and formed by another rotating magnetic head, and at the time of reproducing operation, the overwritten portion is replaced by another rotating magnetic head. As described above, the fifth and sixth rotating magnetic heads H
By making the azimuth angle of the magnetic air gap at 5 and H6 largely different from the azimuth angles of the magnetic air gaps of the other rotating magnetic heads H1 to H4, the above point can be prevented from hindering the recording / reproducing operation. . In the magnetic recording and reproducing apparatus of the present invention, the information signal to be recorded and reproduced may be an analog signal or a digital signal.

[0094]

As is apparent from the above description, the magnetic recording / reproducing apparatus of the present invention is different from the magnetic recording / reproducing apparatus in which the reciprocating recording / reproducing operation is performed in the direction in which the magnetic tape runs. For an input information signal in a tape inversion period of a predetermined time length set in advance for the inversion operation, a signal having a time length corresponding to one recording trace period on a magnetic tape is used as a unit information signal, and is serially arranged on a time axis. The information signal of the odd-numbered unit in the information signal of the sequential unit arranged in the first memory is stored in the first memory, and the information signal of the even-numbered unit in the information signal of the sequential unit is stored in the second memory. When the magnetic tape is running at a predetermined running speed after the running direction is reversed and the recording operation is restarted, the first memory and the second memory are used. The read information signal is used as a recording signal, and the input information signal is used as a recording signal after a lapse of a predetermined time from the restart of the recording operation. The time length twice as long as the above-mentioned non-recording period, including the information signal of the non-recording period which cannot be avoided at the time of changing from the recording operation to the backward recording operation and at the time of changing from the forward recording operation to the backward recording operation. Since the recorded magnetic tape in which all the input information signals of the tape traveling direction reversal period are recorded can be created within the tape traveling direction reversal period set to, the magnetic recording / reproducing apparatus of the present invention performs the reciprocal recording operation. During the reversal operation of the running direction of the magnetic tape T at the time, the information signal of the unavoidable recording impossible period can be recorded on the magnetic tape without being lost. When recording information for security by the magnetic recording / reproducing apparatus for performing the operation, no signal is lost at the time of the reversal operation of the running direction of the magnetic tape T, so that it can be used very effectively. 1/2 of the inversion period for the memory
There is an advantage that the capacity may be small enough to store the signal of the time.

[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 for explaining an arrangement mode of a rotating magnetic head.

FIG. 3 is a view showing the relationship between the reference edge of the magnetic tape and the rotation trajectory of the rotary magnetic head even when the running state of the magnetic tape changes; FIG. 4 is a diagram for explaining a configuration example of a mechanism used to adjust and change the rotation trajectory of FIG.

FIG. 4 adjusts the rotation trajectory of the rotary magnetic head so that the angle formed between the reference edge of the magnetic tape and the rotation trajectory of the rotary magnetic head matches a specific track angle even when the running speed of the magnetic tape changes. It is a perspective view of a part of example of composition of a mechanism used for changing.

FIG. 5 is a diagram showing a recording trace pattern recorded and formed on a magnetic tape by a reciprocating recording and reproducing operation.

FIG. 6 is a diagram of a signal array used for describing a recording operation during an inversion period.

FIG. 7 is a diagram showing a recording trace pattern formed on a magnetic tape by a recording operation during a reversal period.

FIG. 8 is a diagram of a signal array used for describing a recording operation during an inversion period.

FIG. 9 is a diagram showing a recording trace pattern recorded and formed on a magnetic tape by a reciprocating recording and reproducing operation.

FIG. 10 is a diagram of a signal array used for describing a reproducing operation in an inversion period.

FIG. 11 is a diagram for explaining a track pattern.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Input terminal of the signal to be recorded, 2 ... Output terminal of a reproduction signal, 3 ... Signal processing unit of recording system and reproduction system, 4 ...
Control head, 5: main control unit, 6: drum control unit, 7: drum motor, 8: drum inclination control unit, 9: capstan motor, 10, 11: signal generator, 12: center axis of drum structure DA, 14 ... tilt drive motor, 15,
16: a speed reduction mechanism comprising a plurality of gears, 17: a rotary encoder, 18: a position detector (preset sensor), 2
0 to 23: fulcrum, 30: capstan, 31: pinch roller, 32: control system (capstan control system) for running speed and running phase of magnetic tape, 33: frequency divider, 34 ...
Frequency-voltage converter, 35 ... adder, 36 ... drive circuit,
38, 43: recording / playback switch, 39: timing generator, 40: first memory, 41: second memory, 42 ...
Path changeover switch, 44... Reproduced signal selection switch, 4
5: recording / reproduction signal processing unit, DB: drum base, T: magnetic tape, DA: drum structure, Du: upper drum, Dd ...
Lower drum, Lr: Lead ring, G: Lead ring guide, H1 to H4: Rotating magnetic head, Te: Reference edge of magnetic tape T,

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 31, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

The main control unit (system controller) 5
For example, a device including a microprocessor, a random access memory (RAM), a read only memory (ROM), and the like can be used. The main control unit 5 controls each component of the magnetic recording / reproducing apparatus, for example, the drum rotation control unit 6, a magnetic tape traveling speed and a traveling phase control system (capacity), according to input information from an operation unit (not shown). Stan control system) 32, drum tilt control unit 8
And the like to control the operation of each component described above. The main controller (system controller) 5 causes the magnetic tape T to record an inversion signal of the running direction of the magnetic tape at the time of the first outward recording operation.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0066

[Correction method] Change

[Correction contents]

Next, the information signal B3 of the unit stored in the first memory 40 is read out, and the read signal is transmitted to the signal path changeover switch 42 and the recording / reproduction changeover switch 43 as described above. Then, after being supplied to the recording / reproducing signal processing unit 45, it is converted into a third recording signal B3,
As a result, the data is recorded on the magnetic tape T as a recording mark indicated by B3 in FIG. During the period when the unit information signal B3 is being recorded on the magnetic tape T by the third rotating magnetic head H3, the second read signal supplied from the timing signal generator 39 to the second memory 41 causes the second read signal. The information signal B4 of the unit stored in the memory 41 is read.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0087

[Correction method] Change

[Correction contents]

When the magnetic recording / reproducing apparatus shown in FIG. 1 performs the reproducing operation, the switching generated by the timing signal generator 39 is performed based on the control signal supplied from the main control unit 5 to the timing signal generator 39. According to the control signal, the movable contacts v1, v2 of the recording / playback switch 43 are fixed contacts P1, P2.
2 and the switching control signal generated from the timing signal generator 39 is supplied to the switch 42 in the signal path, so that the movable contacts v1, v2 of the switch 42 in the signal path are fixed contacts. Switch to T1, T2 side. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 8, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

As described above, a running magnetic tape is helically scanned by a rotary magnetic head, so that analog signals can be recorded and reproduced on a magnetic tape by azimuth.
TR (VCR) is a V for recording and reproducing analog signals.
In addition to being widely used worldwide as HS (registered trademark) home VCRs (VCRs), home digital VTRs (VCRs) that enable azimuth recording and reproduction of digital data on magnetic tapes are also available worldwide. DVC standards established as a result of discussions at the "HD Digital VCR Council", in which many VTR-related manufacturers and laboratories from various countries participated, include discrete cosine transform (DCT), adaptive quantization, and variable-length coding. High-efficiency compression of image information by various techniques such as
High-efficiency compression mode, recording data configuration mode, predetermined tape pattern, physical characteristics of the magnetic tape, cassette configuration mode to be applied when recording and reproducing on a magnetic tape as a D mode signal or an HD mode signal, And so on, and its practical use is being promoted. In the helical scan type magnetic recording / reproducing apparatus described above, the position of the rotation locus of the rotary magnetic head drawn in the space by the rotary magnetic head is under the condition that the tilt angle of the rotary shaft of the rotary magnetic head does not change. Is always constant.

Claims (1)

[Claims] 1. 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 recording is performed by a rotating magnetic head mounted on the upper drum. In the helical scan type magnetic recording / reproducing apparatus which performs the recording / reproducing operation of the information signal targeted for the above, the azimuth angle is set to a predetermined angle of 90 degrees or less clockwise with respect to the width direction of the recording trace. A first rotating magnetic head having a magnetic air gap,
And a second rotating magnetic head having a magnetic air gap having the same azimuth angle are disposed on the upper drum at the same mounting height at 180-degree symmetrical positions about the center axis of the drum. A third rotating magnetic head having a magnetic gap whose azimuth angle is set to a predetermined angle of 90 degrees or less counterclockwise with respect to the width direction of the recording trace, At a position spaced apart from the magnetic head and the drum by a predetermined minute interval in the circumferential direction, the first
In the mounting height of the rotating magnetic head, the mounting height is set so as to have a height difference corresponding to the interval between adjacent recording marks on the recorded magnetic tape, and the third rotating magnetic head is mounted on the magnetic head. On the other hand, the fourth rotary magnetic head having a magnetic air gap having the same azimuth angle as the third rotary magnetic head at a position symmetrical with respect to the center axis of the drum by 180 degrees with respect to the center of symmetry, is provided. 3 is provided at the same mounting height as the rotating magnetic head, and
And a azimuth angle different from the azimuth angle of any of the magnetic gaps in the first to fourth rotating magnetic heads at a position spaced apart from the rotating magnetic head by a predetermined distance in the circumferential direction of the drum. A fifth rotating magnetic head having a magnetic gap having a head track width of 1/2 to 1/3 of the head track width of the first to fourth rotating magnetic heads; The mounting height is set so that the rotation trajectory can be positioned in the recording mark which is to be overwritten by the recording head. A magnetic gap having the same azimuth angle and head track width as the above-described fifth rotating magnetic head is provided at a position 180 degrees symmetrical with respect to the center of symmetry. Means for rotating the upper drum, which is provided with a magnetic transducing head at the same mounting height as the fifth rotary magnetic head, at a specific number of revolutions only in a predetermined specific rotational direction; Means for controlling the angle between the rotation locus of the rotary magnetic head and the reference edge of the magnetic tape so that the angle is the same whether the traveling direction of the magnetic tape is the forward direction or the reverse direction. In the state of traveling in the direction, the first (or third) rotating magnetic head and the second (or fourth) rotating magnetic head sequentially record and form information on the magnetic tape, so that adjacent recording marks are formed. At a predetermined traveling speed such that an unrecorded area having at least one recording mark width is formed, and the magnetic tape runs at a predetermined traveling speed in a direction opposite to the specific one direction. State In this case, while the magnetic tape is running in the above-described specific direction, the first (or third) rotating magnetic head and the second (or fourth) rotating magnetic head sequentially record and form. A third (or first) rotating magnetic head and a fourth (or second) rotating magnetic head at a position of an unrecorded area having at least one recording mark width formed between adjacent recorded marks. Means for running the magnetic tape at a predetermined running speed and running phase such that sequential recording marks are formed, and a tape reversing period of a predetermined time length set in advance for reversing the running direction of the magnetic tape. As for the input information signal, a signal having a time length corresponding to one recording trace period on the magnetic tape is taken as a unit information signal, and information of an odd-numbered unit in the information unit of a sequential unit serially arranged on the time axis Signal sequentially Means for storing, in the first memory, the information signals of even-numbered units in the sequential unit of information signals serially arranged on the time axis in the second memory; A signal switching means for switching and outputting an information signal and an information signal read from the first and second memories, and a magnetic tape whose traveling direction has been reversed within a predetermined traveling time during the tape reversal period. At a point in time when the vehicle is running at the speed and the recording operation can be resumed, the information signal of the unit stored in the first memory and the information signal of the unit stored in the second memory are converted to a predetermined signal. Means for starting a read operation for reading in a state having a time difference and outputting an information signal read from each of the memories by the signal switching means; and a unit for reading the unit read from the first memory. The information signal is recorded on the magnetic tape by the first or third (or second or fourth) rotating magnetic head, and the information signal of the unit read from the second memory is converted into the fifth (or sixth) signal. The input information signal is used as a recording signal by means for recording on the magnetic tape by the rotating magnetic head and by the signal switching means after a lapse of a predetermined time from the point of time when the recording operation is resumed during the tape reversal period. And a magnetic recording / reproducing apparatus.