JPH09161358A - Recording and playback device - Google Patents

Abstract

(57) [Abstract] [Problem] Inclination angle of recording track in FWD direction and REV
The recording track in the REV direction is accurately formed between the recording tracks in the FWD direction by matching the inclination angles of the recording tracks in the direction, and reciprocal recording can be performed. A head records on a magnetic tape.
The system controller 12 that controls the rotation speed of the rotating drum 8 and the tape running speed so as to scan at intervals of the number of lines, the head scanning locus in the FWD direction, and the REV
Of the reference voltage generating circuit 13 and the piezoelectric actuators 10A and 10B, which are adjusted so that the scanning loci of the heads in the FWD direction are not parallel and overlap with each other, and a recording track formed with an interval of one recording track in the FWD direction. To
A servo head that scans in the REV direction, and uses the servo signal from the servo head to rotate the rotating drum 8
It controls the rotation speed and tape running speed and adjusts the running path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus capable of reciprocating recording / reproducing with respect to a magnetic tape by controlling a tilt angle of a rotary head.

[0002]

2. Description of the Related Art Conventionally, a digital video tape recorder device (hereinafter referred to as a digital VTR) for recording / reproducing data such as audio and video as digital information on a magnetic tape.
Is known). Such a digital VTR
In order to improve both the frequency characteristics by improving the relative speed of the magnetic head and the magnetic tape and reduce the usage of the magnetic tape at the time of recording / reproducing, a rotating drum that rotates the magnetic head is used. Data recording / recording is performed by performing a so-called helical scan in which the surface of a magnetic tape wound obliquely around
Playback is performed.

As an example of a rotary drum used in such a digital VTR, there is one as shown in FIG. That is, the rotary drum shown in FIG.
A rotating drum 91 to which the magnetic head 90 is attached, and guide rollers 93 and 94 for restricting the running of the magnetic tape 92.
The magnetic tape 92 is wound around the rotating drum 91 while being inclined by the guide rollers 93 and 94. Further, as another example of the rotary drum, as shown in FIG. 19, for example, there is a rotary drum in which two magnetic heads 95 and 96 are provided at opposite positions.
In the case of the rotary drum of FIG. 19, the winding angle of the magnetic tape 92 with respect to the rotary drum 91 is about half that in the case where one magnetic head 90 is provided on the rotary drum 91 as shown in FIG.

In the above digital VTR, when data is recorded using these rotary drums, the magnetic tape 92 is run at a constant speed by the capstan servo system and the rotary drum 91 is run by the head rotation speed control system. Is rotated at a constant speed.

The relationship between the rotational speed of the rotary drum and the running speed of the magnetic tape is determined so that the magnetic tape runs by one track pitch while the rotary drum makes one rotation. Therefore, when n recording heads are provided on the rotating drum, n recording tracks are formed while the rotating drum makes one rotation and the magnetic tape runs for n track pitches. .

With the traveling speed of the magnetic tape and the rotation speed of the rotating drum 91 controlled as described above, the magnetic head 90 or 9 attached to the rotating drum 91.
Recording is performed on the magnetic tape by using Nos. 5 and 96, and as shown in FIG. 20, recording tracks 97 inclined by a predetermined angle are formed on the magnetic tape 92 without a gap.

[0007]

In such a digital VTR, after recording / reproducing in the tape forward direction (hereinafter referred to as FWD direction) is completed, the magnetic tape is rewound in order to perform further recording / reproducing. Is required. For this reason, for example, in order to perform recording again, it is necessary to rewind the entire magnetic tape before recording, and there is a problem that it takes time to restart recording. Particularly in a portable video camera device or the like, rewinding speed is very slow because of power saving, and the rewinding time cannot be ignored. Further, during the rewinding, even if the video needs to be recorded, the recording cannot be performed.

Here, in order to eliminate such an inconvenience, in recent years, when the recording in one direction of the magnetic tape is completed, the running direction of the magnetic tape is reversed to perform recording in the other direction. Such round-trip recording is considered. Of course, also in the case of reproduction corresponding to this, when the reproduction in one direction of the magnetic tape is completed, the reciprocal reproduction is performed in which the traveling direction of the magnetic tape is reversed and the reproduction in the other direction is performed.

However, in the above-described digital VTR, if the recording is performed only with the magnetic tape feeding direction being the reverse feeding direction (hereinafter referred to as REV direction), as shown in FIG. The inclination angle of the recording track 98R formed on the recording track 98R is different from the inclination angle of the recording track 98F formed in the forward feed direction (FWD direction). Further, since the recording track 97 formed in the FWD direction is formed without a gap, when recording in the REV direction, the recording track 97 in the FWD direction is overwritten for recording.

From the above, the above digital V
In order to perform reciprocal recording using TR, the forward direction (F
When performing recording in the WD direction) or the reverse feed direction (REV direction), it is necessary to form recording tracks every other track, for example.

In order to form such alternate recording tracks, first, in FIG. 18, for example, the running speed of the magnetic tape 92 is formed without changing the rotational speed of the rotating drum 91 so that the recording tracks are formed without any gap. Twice as much as when
Recording is performed by moving the magnetic tape 92 in the FWD direction.
That is, the magnetic tape 9 is attached to the magnetic tape 9 by the magnetic head 90 mounted on the rotating drum 91 that rotates at a constant rotation speed.
After one recording track is formed on the second magnetic tape 92, the magnetic tape 92 has two recording tracks before the magnetic head 90 reaches the next magnetic tape 92 as the rotary drum 91 rotates. By being moved by the amount in the FWD direction, every other recording track 99F in the FWD direction is formed on the magnetic tape 92 as shown in FIG.

Next, in order to perform recording in the REV direction on the magnetic tape 92, after the magnetic tape 92 has run to the end, for example, the running direction of the magnetic tape 92 is changed without changing the running speed of the magnetic tape 92. Then, the data is recorded in the same manner as above. As a result, as shown in FIG.
Every other recording track 99R in the direction is formed.

However, in the conventional digital VTR, since the inclination angle of the rotary drum is fixed to the inclination angle when recording in the FWD direction, the recording tracks 99F formed in the FWD direction and the REV direction are formed. The inclination angle is different from that of the recording track 99R that is formed at some times. Therefore, after recording in the FWD direction, the RE
When recording in the V direction, as shown in FIG.
There is a problem that the recording track 99R in the REV direction is partially overlapped and recorded on the recording track 99F in the FWD direction, which is previously recorded, and reciprocal recording cannot be performed.

Even if the inclination angle of the recording track formed in the FWD direction and the inclination angle of the recording track formed in the REV direction can be matched with each other, for example, the inclination angle of the recording track is already formed in the FWD direction. It is very difficult to accurately form the recording tracks in the REV direction between every other recording tracks.

Therefore, the present invention has been made in view of the above-mentioned problems, and it is possible to match the inclination angle of the recording track in the forward direction with the inclination angle of the recording track in the reverse direction. An object of the present invention is to provide a recording / reproducing apparatus capable of accurately forming a recording track in the reverse direction between recording tracks in the forward direction and performing reciprocal recording.

[0016]

In the recording / reproducing apparatus of the present invention, the recording and / or reproducing head on the rotating drum scans the magnetic tape at intervals of one recording track. A means for controlling the rotational speed and the tape running speed, and a second running direction which is the opposite direction of the scanning path of the recording and / or reproducing head on the magnetic tape running in the first running direction and the first running direction. Means for adjusting so that the scanning loci of the recording and / or reproducing heads on the magnetic tape traveling in the above direction are not parallel and do not overlap, and a recording track formed on the magnetic tape traveling in the first traveling direction is And a servo head on a rotating drum that scans on a magnetic tape traveling in the traveling direction of the rotating drum, and controls the rotating speed of the rotating drum and the tape traveling speed by using a servo signal from the servo head. By performing the trajectory adjustment, to solve the problems described above.

That is, according to the recording / reproducing apparatus of the present invention, a servo signal is generated from the previously formed recording track, and another recording track is formed between the previously formed recording tracks based on the servo signal. I am trying to form.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

First, as shown in FIG. 1, the recording / reproducing apparatus according to the first embodiment of the present invention is a digital video tape recorder (digital VTR) for recording / reproducing video and audio as digital data on a magnetic tape. Can be applied to.

The digital VTR shown in FIG. 1 forms recording data based on a rotary head unit 1 for digitally recording and reproducing recorded data and an analog video signal or digital video data supplied from the outside. The rotary head unit 1 is provided with a recording system 2 and a reproducing system 3 for restoring and outputting video data from a reproduction signal read from the magnetic tape by the rotary head unit 1.

The rotary head unit 1 forms a diagonal recording track on a magnetic tape, records recording data on the recording track, and a rotating drum 1a for reproducing the data recorded on the recording track, and the rotating drum 1a. A reel and capstan control unit 4 for controlling the traveling direction and traveling speed of the magnetic tape wound around the drum 1a, a support unit 5 to which the rotating drum 1a is fixed, and a servo control described below. A system controller 12 including a servo signal processing circuit 18 for controlling the entire apparatus, a reference voltage generating circuit 13 for generating a reference voltage for tilt angle control, which will be described later, in accordance with control from the system controller 12, and the like. ing.

The rotary drum 1a is composed of a cylindrical fixed lower drum 6, a cylindrical fixed upper drum 7 and a disk-shaped rotating drum 8 rotatably provided on the fixed upper drum 7. Has been done.

On the peripheral side of the rotating drum 8, as shown in FIG. 2A, four recording heads H _{RE1 to} H _RE4 corresponding to four channels and these four recording heads H _{RE
RE1 to HRE4} are placed 180 degrees opposite to each other 4
One of the reproducing head H _PB1 ~H _{PB 4,} described later forward (FW
The servo head (hereinafter referred to as the FWD servo head H _FS ) for the D direction) and the FWD servo head H _FS have 18
Servo heads in the opposite direction (REV direction), which will be described later, are arranged facing each other by 0 degree (hereinafter, REV servo head H).
Called _RS ) and is provided. This rotating drum 8
Is rotationally driven at a constant rotational speed by a drive motor 59 that operates under the control of the servo signal processing circuit 18 in the system controller 12.

The support portion 5 is composed of a lower drum fixing portion 5F for fixing the fixed lower drum 6 and an upper drum fixing portion 5E for fixing the fixed upper drum 7. The lower drum fixing portion 5F and the upper drum fixing portion 5E are connected to each other at their central portions, and have a structure in which H is laid sideways when viewed from the side.

In addition, the supporting portion 5 has piezoelectric actuators 10A and 10B which expand and contract in accordance with the supplied voltage.
Are provided over the lower drum fixing portion 5F and the upper drum fixing portion 5E, respectively.

The rotary head unit 1 further includes distance sensors 11A and 11B for detecting the distance between the fixed lower drum 6 and the rotating drum 8, the reference voltage from the reference voltage generating circuit 13, and the distance sensor. Based on the detection outputs of 11A and 11B, the piezoelectric actuators 10A and 10
Differential amplifiers 14A, 14B, 15 for driving B
A, 15B and, at the time of reproduction supplies a reproduced signal reproduced from the magnetic tape by the reproducing head H _PB1 to H _PB4 the reproducing system 3, the recording data during recording is supplied from the recording system 2 recording head H _RE1 to H _And a switching circuit 16 for supplying a signal for servo, which is supplied to _RE4 and reproduced by the servo head H _FS or H _{RS as} described later, to the servo signal processing circuit 18 of the system controller 12.

The recording system 2 is an analog / digital conversion (hereinafter referred to as A / D conversion) circuit 2 for converting an analog video signal supplied from the outside into digital video data.
1, a switching circuit 22 for switching and outputting video data from the A / D conversion circuit 21 and digital video data supplied from the outside, and a buffer memory 23 to which the video data from the switching circuit 22 is supplied. An encoding circuit 24 that reads out the video data from the buffer memory 23, encodes the video data, adds an error correction code and outputs the video data.
And a synchronization generating circuit 25 for adding synchronization information to the output of the encoding circuit 24 and outputting the same, and an output of the synchronization generating circuit 25 is, for example, a so-called 8-14 modulation (Eight-Forteen Modurati).
and a modulation circuit 26 which is modulated by the on) method and is supplied to the switching circuit 16.

The reproduction system 3 includes a demodulation circuit 31 for reproducing the reproduction signal reproduced from the magnetic tape by the rotary head unit 1 and supplied through the switching circuit 16 to perform demodulation processing corresponding to the 8-14 modulation. A memory 32 for temporarily holding the reproduction data demodulated by the demodulation circuit 31 for use in the subsequent decoding processing, and error correction processing and decoding processing for the reproduction data read from the memory 32. And a decoding circuit 33 for performing the above.
Buffer memory 34 for holding the decoded output from 3 for use in subsequent process processing, and process processing circuit 3 for performing process processing on the output of the buffer memory 34.
5 and D for digital / analog conversion (hereinafter referred to as D / A conversion) of the output of the process processing circuit 35
A / A conversion circuit 36. The output of the process processing circuit 35 can be directly output as digital video data.

Now, the structure of the rotary drum 1a will be described in more detail. As shown in FIG. 3, the fixed lower drum 6 and the fixed upper drum 7 are attached to the support portion 5 by screws 41A and 42A, respectively. It is fixed.

A cylindrical bearing holder 7A is formed on the fixed upper drum 7, and a rotary shaft 44 is rotatably supported by bearings 45A and 45B held by the bearing holder 7A. There is.

A cylindrical fitting portion 46B formed at the center of the flange 46 is fitted and fixed to the lower end of the rotary shaft 44. Mounting surface (top surface) of this flange 46
The rotating drum 8 is fixed to 46A. Head substrates 56 corresponding to the magnetic heads H _{RE1 to} H _RE4 , H _{PB1 to} HP _B4 , H _FS , and H _RS shown in FIG. 2 are fastened to the peripheral side of the rotating drum 8. Each of the magnetic heads described above is fixed via the head substrate 56 so as to slightly project from the peripheral portion of the rotating drum 8. The height of each of these magnetic heads can be finely adjusted by a corresponding adjusting screw 57. As a result, each magnetic head attached to the rotating drum 8 can be rotated integrally with the rotating shaft 44. It should be noted that FIG. 2B schematically shows the height relationship of the magnetic heads attached to the rotating drum 8 (the adjusting screw and the head substrate are not shown).
Details of the height relationship of each magnetic head shown in FIG. 2B will be described later.

A bearing holder 6B is formed on the lower fixed drum 6, and the rotary shaft 54 is rotatably supported by bearings 55A and 55B held by the bearing holder 6B. There is. This rotating shaft 54
And the rotary shaft 4 provided on the fixed upper drum 7 side.
4 are connected to each other by a flexible joint 47, and when the drive motor 59 is rotationally driven to rotate the rotary shaft 54, the rotary shaft 44 can be rotated integrally with this. Thus, by driving the drive motor 59, each magnetic head can be rotated via the rotating shafts 54, 44 and the rotating drum 8.

The rotor 53B of the rotary transformer 53 is fixed to the lower end of the flexible joint 47.
It can rotate together with 7. The stator 53A of the rotary transformer 53 is fixed to the surface of the bearing holding portion 6B of the fixed lower drum 6.

In the rotary drum 1a, when the magnetic head is replaced, the rotating drum 8 is replaced with the fixed upper drum 7. At this time, the parallelism of the mounting surface 46A of the flange 46 fixed to the rotating shaft 44 (that is, the perpendicularity of the mounting surface 46A of the flange 46 to the rotating shaft 44) and the plane of the mounting surface of the rotating drum 8 to the flange 46. Are assembled so that the degree and the angle are within a preset error range, and the error of the rotation trajectory of each magnetic head with respect to the fixed upper drum 7 is within the allowable range. Therefore, by replacing the fixed upper drum 7 in which the rotating drum 8 is incorporated as described above, it is possible to eliminate the mounting error of the rotating drum 8 that occurs when only the rotating drum 8 is replaced. Further, when a plurality of magnetic heads are attached to the rotating drum 8 as described above, if only the rotating drum 8 is replaced,
With the rotating drum 8 attached to the rotating drum 1a,
It is necessary to adjust the rotation loci of a plurality of magnetic heads. However, if the fixed upper drum 7 in which the rotating drum 8 is incorporated as described above is replaced, the magnetic force is reduced in the state where the rotating shaft 44, the flange 46 and the rotating drum 8 are attached to the fixed upper drum 7 in advance. The rotation trajectory of the head can be adjusted. Then, by incorporating the rotating drum 8 in advance and replacing the fixed upper drum 7 in which the rotation locus of the magnetic head has been adjusted, the rotation locus of the magnetic head can be easily adjusted.

By the way, two slits 5C and 5 are formed in the supporting portion 5 for supporting the upper fixed drum 7 and the lower fixed drum 6.
D is formed, and as shown in FIG. 4, notches 5A and 5B are formed so as to communicate with the slit 5C.

Therefore, the supporting portion 5 is divided into an upper drum fixing portion 5E for supporting the fixed upper drum 7 and a lower drum fixing portion 5F for supporting the fixed lower drum 6 by the slit 5C, and the upper drum fixing portion 5E and the lower drum fixing portion 5E. The drum fixing portion 5F is connected by a coupling portion 69 formed between the cutout portions 5A and 5B.

A support hole 70A is formed in the vertical direction on the upper surface of the cutout portion 5A.
A cylindrical piezoelectric actuator 10A is provided inside. This piezoelectric actuator 10A has its lower end abutted on the bottom surface of the cutout portion 5A, and its upper end abutted on the screw 68A screwed into the screw hole 65A.
It is fixed to the bottom surface of the cutout portion 5A and the screw 68A.

A support hole 70B is formed in the vertical direction on the upper surface of the cutout portion 5B.
A cylindrical piezoelectric actuator 10B is provided in B. The piezoelectric actuator 10B has its lower end in contact with the bottom surface of the cutout portion 5B, and has its upper end in contact with the screw 68B screwed into the screw hole 65B, whereby the bottom surface of the cutout portion 5B and the screw 68B are contacted. It is fixed.

The piezoelectric actuators 10A and 10B are
It expands and contracts in the longitudinal direction, that is, in the direction of arrow d in FIG. Therefore, the piezoelectric actuator 1
By controlling the voltage values applied to 0A and 10B, for example, by contracting the piezoelectric actuator 10A and extending the piezoelectric actuator 10B, as shown in FIG. 5B, the fulcrum O ₂ of the coupling portion 69 is centered. The upper drum fixing portion 5E tilts in the direction indicated by the arrow a in FIG. On the contrary, for example, by extending the piezoelectric actuator 10A and contracting the piezoelectric actuator 10B, the upper drum fixing portion 5E is centered on the fulcrum O ₂ of the coupling portion 69, and the upper drum fixing portion 5E shown in FIG.
During (B) of, tilts in the direction opposite to the arrow a.

As a result, as shown in FIG. 6A, in which the supporting portion 5 in FIG. 5B is viewed as the rotary drum 1a from the side opposite to the paper surface, the fixed upper drum 7 is in a horizontal state, for example, a piezoelectric actuator. When the piezoelectric actuator 10B is driven so as to be contracted and the piezoelectric actuator 10B is extended, the fixed upper drum 7 fixed to the upper drum fixing portion 5E accordingly moves in the direction indicated by the arrow a, as shown in FIG. Lean. Therefore, the rotating drum 8 integrated with the upper drum fixing portion 5E together with the fixed upper drum 7 is indicated by an arrow a in FIG.
As a result, the trajectory of the magnetic head fixed to the rotating drum 8 can be inclined with respect to the magnetic tape slidingly contacting the peripheral side surfaces of the fixed upper drum 7 and the fixed lower drum 6.

When the fixed upper drum 7 is driven in a horizontal state as shown in FIG. 6A so that the piezoelectric actuator 10A is extended and the piezoelectric actuator 10B is contracted, as shown in FIG. 6C. Accordingly, the fixed upper drum 7 fixed to the upper drum fixing portion 5E accordingly tilts in the direction of arrow a in FIG. 6C. Therefore, the rotating drum 8 integrated with the upper drum fixing portion 5E is also tilted together with the fixed upper drum 7 in the direction of the arrow a in FIG. 6C, and as a result, the magnetic force fixed to the rotating drum 8 is fixed. The trajectory of the head can be tilted with respect to the magnetic tape that is in sliding contact with the peripheral side surfaces of the fixed upper drum 7 and the fixed lower drum 6.

As described above, the piezoelectric actuator 10
By adjusting the expansion and contraction amounts of A and 10B according to the voltage value applied thereto, the scanning locus of the magnetic head with respect to the magnetic tape can be tilted in the azimuth direction. Hereinafter, such adjustment in the azimuth direction is referred to as horizontality adjustment.

Further, in FIG. 4, the supporting portion 5 includes a lower drum fixing portion 5F for fixing the fixed lower drum 6 and an upper drum fixing portion 5E for fixing the fixed upper drum 7 by means of slits 5D formed in the vertical direction. Aori adjustment unit 5 connected to
It is divided into G and G via a connecting portion 75.

The lower drum fixing portion 5F is provided in the tilt adjusting portion 5G.
Is formed with a support hole 70C that communicates with the piezoelectric actuator 62. The support hole 70C holds the piezoelectric actuator 62 by a screw 63 screwed into the screw hole 71. By adjusting the voltage value applied to the piezoelectric actuator 62, the piezoelectric actuator 62 can be expanded and contracted.

Therefore, by extending the piezoelectric actuator 62, it is possible to displace the tilt adjusting portion 5G in the direction closer to the lower drum fixing portion 5F, that is, in the direction shown by the arrow b in FIG. By contracting, the tilt adjusting portion 5G can be displaced in the direction away from the lower drum fixing portion 5F, that is, in the direction opposite to the arrow b in the figure.

Therefore, as shown in FIG. 3, when the piezoelectric actuator 62 displaces the tilt adjusting portion 5G with respect to the lower drum fixing portion 5F in the direction shown by the arrow b in FIG. 3, the tilt adjusting portion 5G is moved. The fixed upper drum 7 can be displaced through the upper drum fixing portion 5E coupled to the fixed upper drum 7. The displacement direction of the fixed upper drum 7 becomes the direction indicated about a fulcrum O ₁ of the coupling portion 75 of the support 5 by the arrow c in FIG.

On the contrary, when the tilt adjusting portion 5G is displaced by the piezoelectric actuator 62 in the direction opposite to the arrow b in FIG. 3 with respect to the lower drum fixing portion 5F, the tilt adjusting portion 5G is connected to the tilt adjusting portion 5G. The fixed upper drum 7 can be displaced via the upper drum fixing portion 5E. The displacement direction of the fixed upper drum 7 is the fulcrum O ₁ of the connecting portion 75 of the supporting portion 5.
The direction is opposite to the arrow c in FIG.

As a result, as shown in FIG. 7A, in which the supporting portion 5 of FIG. 5B is viewed as the rotary drum 1a from the opposite side of the paper surface, the fixed upper drum 7 is in a horizontal state, for example, as shown in FIG.
When the fixed upper drum 7 is displaced by the piezoelectric actuator 62 in the direction indicated by the arrow c in FIG. 6B, the rotating drum 8 integrated with the rotary shaft 44 of the fixed upper drum 7 is also correspondingly moved. The fixed upper drum 7 and the fixed upper drum 7 are inclined in the direction shown by the arrow c in FIG. 7B, and as a result, the loci of the magnetic head fixed to the rotating drum 8 are transferred to the peripheral side surfaces of the fixed upper drum 7 and the fixed lower drum 6. It can be displaced upward with respect to the magnetic tape in sliding contact.

Further, as shown in FIG. 7A, the fixed upper drum 7 is in a horizontal state, and for example, as shown in FIG. 7C, the fixed upper drum 7 is fixed by the piezoelectric actuator 62.
7 is displaced in the direction of arrow c in FIG. 7C, the rotating drum 8 integrated with the rotary shaft 44 of the fixed upper drum 7 is also moved to the fixed upper drum 7 in FIG. C)
Inclining in the direction of the arrow c in the middle, as a result, the locus of the magnetic head fixed to the rotating drum 8 is displaced downward with respect to the magnetic tape slidingly contacting the peripheral side surfaces of the fixed upper drum 7 and the fixed lower drum 6. Can be made.

By adjusting the expansion / contraction amount of the piezoelectric actuator 62 in this manner, the scanning locus of each magnetic head with respect to the magnetic tape can be moved in parallel in the vertical direction (tilt direction). Hereinafter, such adjustment in the tilt direction will be referred to as vertical displacement degree adjustment.

In the lower surface 8C of the rotating drum 1a of the rotating drum 1a, a region where each magnetic head is not provided is mirror-finished, and the lower surface 8C of the fixed lower drum 6 is processed.
As shown in FIG. 8, the distance sensor 11B described above is fixed at a position opposite to. This distance sensor 11B
Is composed of a laser diode for irradiating the lower surface 8C of the rotating drum 8 with laser light and a light receiving portion for receiving the reflected laser light reflected by the lower surface 8C. The distance sensor 11B and the lower surface 8C at the light receiving position. The distance is detected. The distance sensor 11B outputs a voltage level corresponding to the light receiving position of the reflected laser light, that is, the distance between the distance sensor 11B and the lower surface 8C as a detection output.

Similarly, the rotary drum 1a has distance sensors 11A, 11 having the same structure as the distance sensor 11B.
C is provided. The distance sensors 11A to 11C are arranged on a straight line passing through the rotation center of the rotating drum 8, that is, the rotation axis 44, as shown in FIG. 5A showing the upper surface of the rotating drum 1a. Placed,
The distance sensor 11A is arranged at a position 90 degrees apart from the distance sensors 11B and 11C.

Further, on the straight line passing through the distance sensors 11B and 11C, there is the connecting portion 69 of the supporting portion 5 shown in FIG. 4, which allows the azimuth adjustment of the rotating drum 8 by the piezoelectric actuators 10A and 10B. When the rotating drum 8 is displaced in the azimuth direction, the detection outputs of the distance sensors 11B and 11C do not change, and when the rotating drum 8 is tilt-adjusted (vertical displacement degree adjustment) by the piezoelectric actuator 62, When displaced in the tilt direction, the detection outputs of the distance sensors 11B and 11C change.

The detection output of the distance sensor 11A changes when the rotating drum 8 is adjusted by the piezoelectric actuator 62 for azimuth adjustment (horizontal degree adjustment) and when the rotating drum 8 is displaced in the azimuth direction. .

Therefore, only the displacement of the rotating drum 8 in the tilt direction can be detected by the detection outputs of the distance sensors 11B and 11C, and the displacement of the rotating drum 8 in the azimuth direction, that is, the horizontal displacement can be detected by the detection output of the distance sensor 11A. Only the degree can be detected.

Next, the basic operation of the digital VTR according to this configuration example will be described together with the operation of the rotary drum 1a.

Returning to FIG. 1, when recording an image, digital image data or an analog image signal is externally supplied to the recording system 2. When an analog video signal is supplied from the outside, the analog video signal is A / D converted by the A / D conversion circuit 21, and the obtained video data is sent to the switching circuit 22. On the other hand, when digital video data is supplied from the outside, the video data is supplied to the switching circuit 22.

The switching circuit 22 switches the video data from the A / D conversion circuit 21 and the video data from the outside and supplies it to the buffer memory 23. As a result, the buffer memory 23 stores the analog video signal
The D / D converted video data or the digital video data supplied from the outside is stored.

The system synchronization generating circuit 27 extracts the synchronization information from the externally supplied digital video data or analog video signal and generates a system synchronization signal for controlling the entire apparatus according to the synchronization information. This system synchronization signal is used, for example, by the system controller 12 or the like described above to control the rotation speed of the rotating drum 8.

The encoding circuit 24 encodes the video data of a predetermined recording unit read from the buffer memory 23 at predetermined time intervals in synchronization with the system synchronization signal from the system synchronization generation circuit 26, and outputs an error. A parity for correction is added and supplied to the synchronization generation circuit 25. The synchronization generation circuit 25 adds synchronization information and the like to the encoded video data from the encoding circuit 24, and supplies it to the modulation circuit 26 for each predetermined recording unit.

When a predetermined unit of video data is supplied from the synchronization generating circuit 25, the modulation circuit 26 modulates the supplied video data by, for example, 8-14 to form recording data, and the formed recording data is recorded. It is supplied to the switching circuit 16. The switching circuit 16 sequentially supplies the recording data from the modulation circuit 26 to the recording heads H _{RE1 to} H _RE4 shown in FIG.

On the other hand, the system controller 12 uses the reel and capstan control unit 4 when recording the image.
Is controlled to drive the magnetic tape in a forward (FWD) direction or a reverse (REV) direction at a constant speed. At the same time, the system controller 12 causes the drive motor 59
Is controlled to rotate the rotating drum 8 at a constant rotation speed.

Here, the arrangement relationship of the four recording heads H _{RE1 to} H _RE4 shown in FIG. 2 is, for example, that the magnetic tape is run at a constant speed and the rotating drum 8 is rotated once to make the four recording heads. When four recording tracks are formed on the magnetic tape by H _{RE1 to} H _RE4 , the _space between the recording tracks is one recording track (one track pitch).
They are arranged so that they are separated from each other. The relationship between the number of rotations of the rotating drum 8 and the running speed of the magnetic tape is set so that the magnetic tape runs for eight recording tracks during one rotation of the rotating drum 8. With the above relationship, the above four recording heads H _RE1
~ When recording with H _RE4 , FW will _appear on the magnetic tape.
Recording tracks for four channels in the D direction or the REV direction are formed every one recording track.

Further, the system controller 1 at this time
Reference numeral 2 instructs the reference voltage generation circuit 13 to generate a reference voltage corresponding to a predetermined inclination angle corresponding to the traveling direction of the magnetic tape.

The reference voltage generating circuit 13 responds to a control signal for tilt angle control instructed by the system controller 12, and outputs a first reference voltage for controlling the driving of the piezoelectric actuator 10A and the piezoelectric actuator 10B. Generate a second reference voltage for drive control,
Is supplied to the non-inverting input of the differential amplifier 14A, and the second reference voltage is supplied to the non-inverting input of the differential amplifier 14B.

The differential amplifier 14A finds the difference between the first reference voltage and the detection output of the distance sensor 11A. This difference signal is amplified via the differential amplifier 15A and sent to the piezoelectric actuator 10A as a drive voltage. On the other hand, the differential amplifier 14B calculates the difference between the second reference voltage and the detection output of the distance sensor 11B. This difference signal is
The voltage is amplified via the differential amplifier 15B and supplied to the piezoelectric actuator 10B as a drive voltage.

These piezoelectric actuators 10A and 10B
Expands and contracts according to the supplied drive voltage. As the piezoelectric actuators 10A and 10B expand and contract, the tilt angle between the upper drum fixing portion 5E and the lower drum fixing portion 5F changes. Since the inclination angle corresponds to the difference between the detection output of the distance sensors 11A and 11B and the first and second reference voltages, the detection output of the distance sensors 11A and 11B and the first and second reference voltages. When the difference from the reference voltage becomes 0, the desired tilt angle is obtained, and when the desired tilt angle is reached, the driving of the piezoelectric actuators 10A, 10B ends.

In this way, the inclination angle of the upper drum fixing portion 5E is controlled according to the first and second reference voltages, and the inclination angle of the fixed upper drum 7 fixed to the upper drum fixing portion 5E is controlled. It As a result, the tilt angle of the rotating drum 8 rotatably attached to the fixed upper drum 7 is controlled.

That is, when performing recording in the FWD direction on the magnetic tape, the system controller 12 controls the reel and capstan control unit 4 to perform FWD recording on the magnetic tape.
In addition to traveling at the traveling speed described above, the reference voltage generating circuit 13 is controlled to record, for example, the fixed upper drum 7 in a horizontal state as shown in FIG. At this time, each magnetic head scans the magnetic tape along a trajectory Tr1 having a predetermined inclination angle. Therefore, by performing such recording, as shown in FIG. 10A, every other recording track having a predetermined inclination angle is formed on the magnetic tape.

Further, when recording (still recording) is performed by stopping the running of the magnetic tape, the system controller 12 controls the reference voltage generating circuit 13 so that the piezoelectric actuator 10A is turned on as shown in FIG. Recording is performed by contracting and extending the piezoelectric actuator 10B and inclining the fixed upper drum 7 in the direction of arrow a. At this time, each magnetic head scans the magnetic tape along a trajectory Tr2 having the same inclination angle as that in the recording in the FWD direction. As a result, a recording track having the same inclination angle as the recording track in the FWD direction is formed on the magnetic tape.

When recording in the REV direction on the magnetic tape, the system controller 12 controls the reel and capstan control unit 4 to run the magnetic tape in the REV direction at the above-mentioned running speed and at the same time the reference voltage is applied. By controlling the generation circuit 13, as shown in FIG. 9, the fixed upper drum 7 is further tilted in the direction of arrow a to perform recording as compared with the case of performing still recording. At this time, each magnetic head scans the magnetic tape along the locus Tr3 having the same inclination angle as that at the time of recording in the FWD direction. Therefore, by performing such recording, as shown in FIG.
Every other recording track having the same inclination angle as the recording track in the FWD direction is formed on the magnetic tape.

That is, after recording in the FWD direction or REV direction as described above, the reel and capstan controller 4 reverses the running direction of the magnetic tape to perform recording in the other direction. As shown in C), F
A recording track in the other direction is formed between recording tracks in the WD direction or the REV direction.

Thus, in this digital VTR, F
When recording in the WD direction and the REV direction, every other recording track is formed, and the inclination angles of the recording tracks in the FWD direction and the REV direction are made equal to each other.
Overlapping of recording tracks in the WD and REV directions is prevented, and video data can be recorded in a reciprocating manner.

Since reciprocal recording can be performed in this digital VTR, recording can be started from anywhere on the magnetic tape without the need for rewinding. Also,
After the recording in one direction is completed, by reversing the running direction of the magnetic tape, the recording in the other direction can be continuously performed, and the recording for a predetermined recording time determined by the tape length can be performed.

Next, when reproducing the magnetic tape on which the video data is recorded as described above, the system controller 12 controls the reel and capstan control unit 4 to move the magnetic tape in the FWD direction or the REV direction. The drum 8 is rotated at the same speed as during recording, and the rotating drum 8 is rotated at the same speed as during recording.

[0076] That is, even during the reproduction, positional relationship of the four reproducing heads H _PB1 to H _PB4 shown in FIG. 2, for example, the rotating drum 8 is rotated once in conjunction with driving the magnetic tape at a constant speed The above four reproducing heads H
If you trace the magnetic tape by _PB1 to H _PB4, each scan trajectory is being made and arranged relationship spaced apart from the respective recording tracks one roll. Further, the relationship between the rotational speed of the rotating drum and the running speed of the magnetic tape during the reproduction is set so that the magnetic tape runs for eight recording tracks while the rotating drum 8 makes one rotation. In a state in which no such relationship, when traces the magnetic tape by the four playback heads H _PB1 to H _PB4,
FWD direction or RE formed on the magnetic tape
Recording tracks of four channels in the V direction becomes possible to scan each at the four reproducing heads H _PB1 to H _PB4.

That is, the system controller 12
Similar to the time of recording, the inclination of the fixed upper drum 7 is changed as shown in FIG. 9 above according to the running direction of the tape. Thus, the reproducing head H _PB1 to H _PB4 scans each recording track of the four channels of every other formed during the above-described recording. Each reproducing head H _PB1 to H _PB4 is, F
The recording track in the WD direction or the REV direction is selectively reproduced, and the reproduction signal of the recording track is sequentially switched.
To supply.

The switching circuit 16 _controls each reproducing head _HPB1.
When the reproduction signals are supplied from ~ _HPB4 , the reproduction signals are sequentially supplied to the demodulation circuit 31. The demodulation circuit 31
A reproduction signal from the reproducing head H _PB1 to H _PB4 binarized,
Further, processing such as demodulation corresponding to 8-14 modulation is performed to form reproduction data, and the reproduction data is sent to the memory 32.

The reproduced data stored in the memory 32 is sent to the decoding circuit 33, where it is subjected to error correction processing and decoding processing.

The reproduced data output from the decoding circuit 33 is stored in the buffer memory 34, then read out and sent to the process processing circuit 35. The process processing circuit 35 reads the reproduction data held in the buffer memory 34 so that the reproduction data is output at the same rate as at the time of recording, performs process processing on the reproduction data, and outputs the reproduction data as video data. D / A video data
It is supplied to the conversion circuit 36. The D / A conversion circuit 36 D / A converts the video data from the process processing circuit 35 to form a video signal and outputs it.

Thus, the data recorded on the recording track in the FWD direction or the REV direction of the magnetic tape is reproduced, and the video data and the video signal based on the reproduced data are output.

In the above configuration example, in order to match the inclination angles of the recording tracks in the FWD direction and the REV direction, the inclination angle of the scanning locus Tr3 of each magnetic head during tape running in the REV direction shown in FIG. 9 is set. , The inclination angle of the fixed upper drum 7 when recording in the FWD direction is made to match the inclination angle of the scanning locus Tr1 of the magnetic head during tape running in the FWD direction with respect to the fixed lower drum 6. Therefore, the fixed upper drum 7 has a large inclination angle when the tape is running in the REV direction.

Therefore, the inclination angle of the fixed upper drum 7 is controlled only in one direction, and the symmetry of the inclination angle of the fixed upper drum 7 between the tape running in the FWD direction and the tape running in the REV direction becomes poor. As a result, there is a possibility that it may become an obstacle in designing the mechanism of the support portion 5, the piezoelectric actuators 10A, 10B, and the like. Further, when the tape runs in the REV direction, the inclination angle of the fixed upper drum 7 becomes too large, so that the contact between the magnetic tape and the magnetic head becomes non-uniform, and the recording / reproducing characteristics in the FWD direction and the REV direction may differ.

Therefore, in the digital VTR according to the second configuration example of the present invention, when the tape is running in the FWD direction and when the RE is running.
The inclination angle of the fixed upper drum 7 is set to be symmetrical when the tape is running in the V direction. The digital VTR of the second configuration example has the same configuration as the digital VTR of the first configuration example shown in FIG. 1 described above except for the rotary head section. Therefore, the digital VT of the first configuration example
The description of the part overlapping with R is omitted, and the first
The part different from the digital VTR in the configuration example will be described.

Digital VTR according to the second configuration example
Then, as shown in FIG. 11, when the recording head scans the recording head on the magnetic tape when recording in the FWD direction, the magnetic tape travels with the fixed upper drum 7 being horizontal with respect to the fixed lower drum 6. The locus Tr4 has the same inclination angle as the inclination angle of the recording track (hereinafter, simply referred to as the still recording angle) when stopped and still recording is performed.
When recording is performed in the FWD direction by rotating the rotating drum 8 at the same number of revolutions as in the first configuration example in such a state, as shown in FIG. Recording channels for four channels are formed on the magnetic tape at intervals of every other book.

In this state, the fixed upper drum 7
When the tape running angle is fixed or the tape running is set to the REV direction, the scanning loci of the recording head on the magnetic tape are loci each having a smaller tilt angle than the still recording angle, as shown in FIG. It becomes Tr5 and Tr6.

Therefore, in this digital VTR, the FW is the same as in the digital VTR according to the first configuration example.
The tilt angle of the fixed drum is changed when recording in the D direction and when recording in the REV direction so that the tilt angles of the recording tracks to be formed match.

That is, when recording on the magnetic tape in the FWD direction, the system controller 12 controls the reference voltage generating circuit 13 to cause the piezoelectric actuator 10 to operate.
By extending A and contracting the piezoelectric actuator 10B, as shown in FIG. 13, recording is performed with the fixed upper drum 7 tilted in the direction opposite to the arrow a in the drawing.
At this time, the magnetic head scans the magnetic tape along the locus Tr7 having the same inclination angle as the still recording angle.
Therefore, by performing such recording, FIG.
As shown in FIG. 5, recording tracks for four channels having a still recording angle and every other interval in the FWD direction are formed in the same manner as in the first configuration example described above.

When performing the above-mentioned still recording on the magnetic tape, the system controller 12 controls the reference voltage generating circuit 13 to move the fixed upper drum 7 to the fixed lower drum 6 as shown in FIG. And record as horizontal. At this time, the recording head scans the magnetic tape along a locus Tr8 having a still recording angle. As a result, four channels of recording tracks having a still recording angle are formed on the magnetic tape similarly to the recording tracks in the FWD direction.

Further, when recording in the REV direction on the magnetic tape, the system controller 12 controls the reference voltage generating circuit 13 to contract the piezoelectric actuator 10A and extend the piezoelectric actuator 10B. As shown, recording is performed with the fixed upper drum 7 tilted in the direction of arrow a in the figure. At this time, at this time, the recording head scans the magnetic tape along the locus Tr9 having the still recording angle. As a result, the recording tracks for four channels are formed on the magnetic tape at intervals of every other line having a still recording angle like the recording tracks in the FWD direction.

After recording in the FWD direction as described above, by recording in the REV direction as described above, as shown in FIG. 15, between the recording tracks of four channels in the FWD direction. Thus, recording channels of four channels in the REV direction are formed.

Thus, in this digital VTR, F
When performing recording in the WD direction and the REV direction, recording tracks having an interval between every other are formed, and the inclination angles of the recording tracks in the FWD direction and the REV direction are matched to each other, and
It is possible to prevent the recording tracks in the WD direction and the REV direction from overlapping each other, and it is possible to record the video data in a reciprocating manner. It should be noted that the same applies to the case of reproduction, and therefore description thereof will be omitted.

In the digital VTR, as described above, the fixed upper drum 7 is set to be horizontal with respect to the fixed lower drum 6 when performing still recording. The state in which the fixed upper drum 7 is horizontal to the fixed lower drum 6 is the center of the tilt angle control range. When recording in the FWD direction, the inclination angle of the fixed upper drum 7 is inclined in the opposite direction to the arrow a in FIG. 13, and when recording in the REV direction, the fixed upper drum 7 is recorded. The recording is performed by inclining the inclination angle of the arrow mark in the direction of arrow a in FIG. Therefore, this digital VT
In R, the inclination angle of the fixed upper drum 7 when recording in the FWD direction and the fixed upper drum 7 when recording in the REV direction
The inclination angle of is symmetrical.

The mechanical load applied to the connecting portion 69 of the upper drum fixing portion 5E to which the fixed upper drum 7 is fixed and the lower drum fixing portion 5F to which the fixed lower drum 6 is fixed is equal to the inclination angle of the fixed upper drum 7. Depends on. Therefore, as described above, by making the inclination angle of the fixed upper drum 7 at the time of recording in the FWD direction and the REV direction symmetrical, the mechanical load of the support portion 5 can be made symmetrical, and the mechanical design Can be facilitated.

Further, in this digital VTR, by making the inclination angles when recording in the FWD direction and the REV direction symmetrical as described above, it is possible to make the contact between the magnetic tape and each magnetic head uniform. The recording / reproducing characteristics in the FWD direction and the REV direction can be made uniform, and stable recording / reproducing can be performed.

In the digital VTR having the configuration example of the present invention as described above, in order to accurately form the recording track in the REV direction between the recording tracks formed in the FWD direction, the servo in the FWD direction is formed. A head (FWD servo head H _FS ) and a servo head (REV servo head H _RS ) for the REV direction, which is arranged 180 degrees opposite to the FWD servo head H _FS , on the rotating drum 8. I am trying to provide it.

Here, the positional relationship between the FWD servo head H _FS and each recording head H _{RE1 to} H _RE4 is as shown in FIG. 2 (A). That is, the FWD servo head H
_{The FS} is arranged, for example, next to the recording head H _RE4 , and, for example, the rotating drum 8 is rotated once while the magnetic tape is running at a constant speed in the FWD direction so that the recording head H _RE4 moves on the magnetic tape. 16A, the FWD servo head H _FS is arranged so as to travel first on the traveling locus along which the recording head H _RE4 travels, as shown in FIG. It Therefore, the FWD servo head H _FS is arranged at a position higher than the other recording heads on the rotating drum 8 as shown in FIG. 2B.

The REV servo head H _RS and the recording heads H _{RE1 to} H _RE4 are arranged as shown in FIG. 2 (A). That is, REV servo head H _RS
For example, the recording head H _RE1 is arranged next to the recording head H _RE1 and the rotating drum 8 is rotated once while the magnetic tape is running at a constant speed in the REV direction to trace the recording head H _RE1 on the magnetic tape. In this case, as shown in FIG. 16B, the recording head next to the track on which the recording head H _RE1 will travel, that is, the FWD
On the adjacent recording track previously formed in the direction
It is arranged so that the V servo head H _RS will run. Therefore, the REV servo head H _RS is arranged at a position higher than the other recording heads on the rotating drum 8 as shown in FIG. 2B.

Here, the digital VTR of the configuration example of the present invention
Is the FWD servo head H _FS arranged as described above.
Alternatively, by using the output signal from the REV servo head H _RS , for example, R between the recording tracks formed in the FWD direction
As a specific structure for accurately forming a recording track in the EV direction, the structure shown in FIG. 17 is provided. Note that the configuration of FIG. 17 shows details of the corresponding portions of FIG.

In FIG. 17, the magnetic tape 40 is used by the FWD servo head H _FS or the REV servo head H _RS .
The signals read from are sent to the switching circuit 101 via the corresponding rotary transformers 100 _F and 100 _R. The switching circuit 101 is F
The output signal from the FWD servo head H _FS is selected in the WD direction, and the output signal from the REV servo head H _RS is selected in the REV direction.

The signal passed through the switching circuit 101 is
After being amplified to a predetermined amplitude by the PB amplifier 102, it is sent to the tracking error detection circuit 104 and the ID detection circuit 105 provided in the servo signal processing circuit 18 of the system controller 12 in the example of FIG.

The tracking error detection circuit 104
Generates tracking information using, for example, a reproduction RF signal reproduced from the magnetic tape 40 by the FWD servo head H _FS or the REV servo head H _RS , and the ID detection circuit 105 records the ID recorded on the recording track.
Detect information. The ID information is recorded in the header portion of the recording track or the like. Further, instead of generating the tracking information by using the reproduction RF signal, it is possible to record predetermined tracking information in the recording track in advance and reproduce it for use. As the tracking information and ID information recorded on these recording tracks, for example, information supplied from the outside may be used, or a tracking information generating means or an ID information generating means may be separately provided, The ID information can be used. Such tracking information and ID information are added to the recording data and recorded on the recording track.

The detected tracking information and ID information are sent to the servo control circuit 107 also provided in the servo signal processing circuit 18. In the servo control circuit 107, a target recording track is confirmed based on the tracking information and the ID information, and recording is performed at a necessary position on the magnetic tape 40 with a necessary angle and phase. A capstan control signal for controlling the rotation of the capstan motor 111 that drives the capstan roller 112, a rotation control signal for the drive motor 59, and a control signal for the reference voltage generation circuit 13 are generated to respectively correspond to the capstan. Output to the motor 111 and the rotary head unit 1.

This makes it possible to accurately form the recording tracks in the REV direction between the recording tracks formed in the FWD direction, for example. Therefore, the recording tracks do not overlap each other, and the reliability of the data can be improved. Further, since the configuration for performing such tracking servo can be realized only by adding or changing a simple and small-scale configuration, it is possible to avoid cost increase.

Further, since the tracking servo and the formation of the recording track can be performed at the same time at the time of recording, the transfer rate can be increased to the transfer rate of the limit value which the digital VTR originally has. If the tracking servo and the recording track cannot be simultaneously formed at the time of recording, the tracking servo and the recording track must be alternately formed, and therefore the transfer rate is 1/2 of the originally usable transfer rate. It will be the limit.

In the digital VTR of the configuration example of the present invention, tracking servo is performed in the same manner as described above at the time of reproduction.
Tracking servo can be performed by using the reproduction output of either the FWD servo head H _FS or the REV servo head H _RS .

In the above description, as shown in FIG. 2B, the FWD servo head H _FS on the rotating drum 8 is used.
Alternatively, an example in which the REV servo head H _RS is arranged at a position higher than other recording heads and the like is given, but if the traces shown in FIGS. 16A and 16B can be performed, other recording will be performed. It is also possible to arrange it at the same height as the head or the like.

Furthermore, the winding angle of the magnetic tape with respect to the rotating drum 1a, the number of rotations of the drum, and the position of each magnetic head arranged on the rotating drum 8 (the angle division of each magnetic head with respect to the center of the rotating drum 8 and the effective position). The angle) is not limited to the above example.

In addition, the number of channels is not limited to four and can be increased or decreased.

[0110]

According to the present invention, the rotational speed of the rotary drum and the tape running so that the recording and / or reproducing head provided on the rotary drum scans the magnetic tape at intervals of one recording track. A speed adjusting means for controlling the speed, and a magnetic field in a second running direction which is the opposite direction of the first running direction from the scanning locus of the recording and / or reproducing head when the magnetic tape is run in the first running direction. Running track adjusting means for adjusting the scanning track of the recording and / or reproducing head when the tape is run so as not to be parallel and to each other, and a recording track formed when the magnetic tape is run in the first running direction. And a servo head provided on the rotary drum that scans when the magnetic tape is run in the second running direction, and the rotary drum is provided using a servo signal from the servo head. By controlling the rotational speed and the tape running speed and adjusting the running locus, it is possible to match the tilt angle of the recording track in the forward direction and the tilt angle of the recording track in the reverse direction, and at the same time, adjust the recording track in the forward direction. A recording track in the reverse direction can be accurately formed between them, and reciprocal recording can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a recording / reproducing apparatus according to the present invention as a digital VTR.
It is a block diagram which shows the schematic structure of the 1st structural example applied to.

FIG. 2 is a diagram for explaining the arrangement of magnetic heads on a rotating drum.

FIG. 3 is a cross-sectional view showing a specific configuration of a rotary drum that constitutes the digital VTR of this configuration example.

FIG. 4 is a perspective view showing a specific shape of a support portion that constitutes a rotary drum.

FIG. 5 is a diagram showing a specific shape of a rotary drum.

FIG. 6 is a diagram for explaining adjustment of the rotating drum in the azimuth direction.

FIG. 7 is a diagram for explaining adjustment of the rotary drum in the tilt direction.

FIG. 8 is a diagram showing a configuration of a distance sensor that constitutes a rotary drum.

FIG. 9 is a diagram for explaining a control operation of a tilt angle of a rotary head unit in a digital VTR.

FIG. 10 is a diagram showing a recording track formed by a digital VTR having a configuration example of the present invention.

FIG. 11 shows a recording / reproducing apparatus according to the present invention, which is a digital VT.
It is a figure for explaining operation of the 2nd example of composition applied to R.

FIG. 12 is a diagram showing a recording format of a digital VTR of a second configuration example.

FIG. 13 is a diagram for explaining a control operation of a tilt angle of the rotary head unit in the digital VTR of the second configuration example.

FIG. 14 is a diagram showing a recording operation in a FWD direction of a digital VTR of a second configuration example.

FIG. 15 is a diagram showing a recording operation in a REV direction of the digital VTR of the second configuration example.

FIG. 16 is a diagram for explaining a relationship between scanning loci of the recording head and the servo head in the configuration example of the present invention.

FIG. 17 is a diagram showing a specific configuration for performing tracking servo using a servo signal from the servo head of the configuration example of the present invention.

FIG. 18 is a diagram showing a configuration of a rotary drum that constitutes a conventional digital VTR.

FIG. 19 is a diagram showing another configuration of a rotary drum which constitutes a conventional digital VTR.

FIG. 20 is a diagram showing a recording format of a conventional digital VTR.

FIG. 21 is a diagram for explaining a recording operation of a conventional digital VTR.

FIG. 22 is a diagram for explaining a recording operation of a conventional digital VTR.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 rotary head part 1a rotary drum 2 recording system 3 reproduction system 4 reel and capstan control part 5 support part 6 fixed lower drum 7 fixed upper drum 8 rotating middle drum 9 magnetic head 10A, 10B piezoelectric actuator 11A, 11B distance sensor 12 system Controller 13 Reference voltage generation circuit 14A, 14B, 15A, 15B Differential amplifier 16 Switching circuit 18 Servo signal processing circuit 104 Tracking error detection circuit 105 ID detection circuit 107 Servo control circuit H _FS FWD Servo head H _RS REV Servo head _HPB1 ~ _HPB4 playback head H _{RE1 to} H _RE4 recording head

Claims (4)

[Claims] 1. A rotation speed and a tape running speed of a rotating drum are controlled so that a recording and / or reproducing head provided on the rotating drum scans a magnetic tape at intervals of one recording track. Speed control means, a scanning locus of the recording and / or reproducing head when the magnetic tape is run in the first running direction, and a magnetic field in the second running direction which is the opposite direction to the first running direction. Scan locus adjusting means for adjusting the scanning loci of the recording and / or reproducing head when the tape is run so as not to be parallel and overlap with each other, and the recording when the magnetic tape is run in the first running direction. Servo provided on the rotating drum for scanning the recording tracks formed on the magnetic tape at intervals of one track when the magnetic tape is run in the second running direction. And a head, using a servo signal from the servo head, a recording and reproducing apparatus which is characterized in that the adjustment of the control and the travel locus of the rotational speed and the tape running speed of the rotary drum. 2. A recording track which is formed on the magnetic tape at an interval of one recording track when the magnetic tape is run in the first running direction in the first running direction. A first traveling direction servo head that is provided on the rotating drum and that scans when the magnetic tape is traveling in the first traveling direction. 2. The recording / reproducing apparatus according to claim 1, wherein a servo signal from the head is used to control the rotational speed of the rotary drum and the tape running speed and to adjust the running locus. 3. A detection means for detecting tracking information and track position information using a servo signal from the servo head is provided, and based on the tracking information and the track position information, a rotation speed of the rotary drum. 2. The recording / reproducing apparatus according to claim 1, wherein the tape traveling speed is controlled and the traveling locus is adjusted. 4. The recording / reproducing apparatus according to claim 1, wherein a plurality of the recording and / or reproducing heads are provided corresponding to a plurality of channels.