JPH09180107A - Rotary head device and recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the reciprocating recording and reproducing with respect to a magnetic tape and to enable performing the recording and simultaneously the reproducing at the time of a reciprocating recording. SOLUTION: This device is constituted of recording heads HR1 , HR2 respectively provided with three gaps and reproducing heads HP1 , HP2 respectively provided with four gaps and a rotary mid-drum 8 in which the reproducing heads HP1 , HP2 are arranged at positions separated by the amount equivalent to the angle θ being one sixth of 360 deg. in the direction reverse to a drum rotational direction with respect to respective corresponding recording heads HR1 , HR2 and the heads are arranged lower than the height of the recording heads HR1 , HR2 by the amount equivalent to the width of the one line of a recording track. In this case, the inclined angle of the rotary mid-drum 8 with respect to the magnetic tape is made the same in an FWD (a tape forwarding) direction and an REV (a reversal) direction and at the time of the recording in the FWD direction and the REV direction, scanning loci of the recording heads HR1 , HR2 are made to be scanned by following reproducing heads HP1 , HP2 .

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 an inclination angle of a rotating drum, and a rotary head apparatus used in this recording / reproducing apparatus.

[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.

An example of a rotary drum used in such a digital VTR is 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.

In the digital VTR, when data is recorded using the rotary drum 91, the magnetic tape 92 is run at a constant speed by the capstan servo system, and the rotary drum 91 is controlled by the head rotation speed control system. Is rotated at a constant speed. That is, the relationship between the number of revolutions of the rotating drum 91 and the traveling speed of the magnetic tape 92 is such that the magnetic head 90 provided on the rotating drum 91 makes one The relationship is such that a recording track of a book is formed.

The magnetic head 90 mounted on the rotating drum 91 controls the traveling speed of the magnetic tape and the number of rotations of the rotating drum 91 as described above.
By recording on the magnetic tape 92, the magnetic tape 9
Recording tracks 97 inclined by a certain angle as shown in FIG.

[0006]

By the way, in such a digital VTR, the tape forward direction (hereinafter, FW) is used.
After recording / playback in the D direction)
Rewinding of the magnetic tape is required for reproduction. 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.

In order to eliminate such an inconvenience, in recent years, when the recording in one direction of the magnetic tape is completed, the traveling direction of the magnetic tape is reversed to perform recording in the other direction. Records are being considered.

That is, when performing the reciprocal recording, first, when recording is performed in the FWD direction, recording tracks are formed on the magnetic tape by, for example, spacing one track at a time. After traveling to the end of the tape, the traveling direction of the magnetic tape was reversed in the opposite direction (hereinafter referred to as REV direction) without changing the traveling speed of the magnetic tape, and the magnetic tape was formed every one track in the previous FWD direction. The RE that fills the space between recording tracks
Recording is performed in the V direction. Note that in the case of reproduction in the FWD direction, only the recording track formed at the time of recording in the previous FWD direction is reproduced, while in the case of reproduction in the REV direction, it is formed at the time of recording in the previous REV direction. Only recorded tracks will be played.

However, in the above digital VTR, as shown in FIG. 26, the inclination angle of the recording track 98F formed in the FWD direction and the inclination angle of the recording track 98R formed in the REV direction are different. It will be different.
That is, in the conventional digital VTR, since the inclination angle of the rotary drum with respect to the magnetic tape is fixed to the inclination angle when recording in the FWD direction, the recording track 98F formed in the FWD direction and the REV direction are formed. The inclination angle is different from that of the recording track 98R that is formed at some times.

Therefore, as described above, for example, FWD
27A, when recording is performed in the recording direction, recording tracks 99F are formed on the magnetic tape 92 at intervals of one track as shown in FIG. 27A, and then recording is performed in the REV direction. 27B, even if the recording tracks 99R are formed on the magnetic tape 92 at intervals of one track as shown in FIG. 27B, As shown in FIG. 27C, the recording tracks are partially overlapped with each other, which makes it difficult to reproduce the signal. That is, FIG.
In the example of (C) of 7, since the recording track in the REV direction is overwritten on the recording track in the FWD direction that was previously recorded, the signal cannot be reproduced from the recording track in the FWD direction.

Further, in the conventional VTR, at the time of recording in the tape forward direction, at the same time as the track is formed by the recording head, the formed recording track is reproduced by the reproducing head (hereinafter referred to as CONFI reproduction). There is a case to be seen. This is performed, for example, for the purpose of determining whether or not accurate recording is performed by performing reproduction simultaneously with recording. Therefore,
It is desired that the CONFI reproduction can be performed even when the above-described VTR capable of performing the reciprocal recording / reproduction is realized.

Therefore, the present invention has been made in view of the above problems, and a rotary head device capable of reciprocating recording / reproducing with respect to a magnetic tape and simultaneously reproducing at the same time. An object is to provide a recording / reproducing device.

[0013]

A rotary head device and a recording / reproducing apparatus of the present invention have a recording head having N gaps and a reproducing head having N + 1 gaps,
A rotating drum in which the reproducing head is arranged at a position separated from the recording head in the direction opposite to the drum rotation direction by a predetermined angle and lower than the recording head by a predetermined height, and a first running direction of the magnetic tape. And a second traveling direction which is the opposite direction to the magnetic tape, and an inclination angle driving means for making the inclination angle of the rotary drum the same with respect to the magnetic tape, and the first traveling direction and the second traveling direction of the magnetic tape. At the time of recording, the traveling locus of the preceding recording head is scanned by the following reproducing head, thereby solving the above problem.

That is, according to the present invention, the inclination angle of the recording track formed on the magnetic tape in the first traveling direction and the inclination angle of the recording track formed on the magnetic tape in the second traveling direction are the same. This prevents the recording tracks from overlapping during reciprocal recording of the magnetic tape, and provides a plurality of gaps on the rotary drum for the recording head and one more gap for the reproducing head than the recording head. By providing the reproducing head at a position separated from the recording head in the direction opposite to the drum rotation direction by a predetermined angle and lower than the recording head by a predetermined height, it is possible to perform CONFI reproduction at the time of reciprocal recording. I am trying.

[0015]

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 of the configuration example according to the present invention is applied to a digital video tape recorder (digital VTR) for recording / reproducing video and audio as digital data on a magnetic tape. be able 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 rotary drum unit 1a for reproducing the data recorded on the recording track, and the rotary drum unit 1a. Rotating drum part 1a
A reel and capstan control unit 4 for controlling the traveling direction and traveling speed of the magnetic tape wound around, a supporting unit 5 to which the rotating drum unit 1a is fixed, and a system controller 12 for controlling the entire apparatus. And a reference voltage generation circuit 13 for generating a reference voltage for tilt angle control, which will be described later, according to control from the system controller 12.

The rotary drum 1a comprises 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.

The rotary drum portion 1a includes 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. It is configured. A recording head and a reproducing head, which will be described later, are attached to the rotating drum 8 and the rotating drum 8 is driven at a constant rotation speed by a drive motor 59 that operates under the control of the system controller 12. It is driven to rotate.

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.

Further, piezoelectric actuators 10A and 10B, which are composed of, for example, piezo elements and expand and contract in accordance with the voltage supplied, are provided on the support portion 5 across the lower drum fixing portion 5F and the upper drum fixing portion 5E, respectively. It is provided.

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 a reproducing signal reproduced from a magnetic tape by a reproducing head provided on the rotating drum 8 during reproduction are supplied to the reproducing system 3, and recording data supplied from the recording system 2 is rotating during recording. And a switching circuit 16 for supplying the recording head provided on the drum 8.

The recording system 2 is an analog / digital conversion (hereinafter referred to as A / D conversion) circuit 2 for converting an externally supplied analog video signal 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.

Here, the structure of the rotary drum portion 1a will be described in more detail. As shown in FIG. 2, the fixed lower drum 6 and the fixed upper drum 7 are provided with screws 41A, respectively.
And is fixed to the support portion 5 by screws 42A.

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 respectively corresponding to the recording head and the reproducing head are fastened to the circumferential side portion of the rotating drum 8,
The recording head and the reproducing head are fixed via the head substrate 56 so as to slightly project from the peripheral portion of the rotating drum 8. The heights of the recording head and the reproducing head can be finely adjusted by the corresponding adjusting screws 57. As a result, the recording head and the reproducing head attached to the rotating drum 8 can rotate together with the rotating shaft 44. The recording head and the reproducing head provided on the rotating drum 8 and their positional relationship will be described later.

A bearing holder 6B is formed on the fixed lower 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, the recording head and the reproducing head can be rotated via the rotating shafts 54 and 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, and this rotor 53B is used for the flexible joint 4.
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 rotating drum unit 1a, for example, when the recording head or the reproducing head is replaced, the rotating drum 8 is replaced with the fixed upper drum 7. At this time,
Mounting surface 46 of flange 46 fixed to rotating shaft 44
A parallelism (ie, mounting surface 46 of flange 46)
The perpendicularity of A to the rotary shaft 44) and the flatness of the mounting surface of the rotating drum 8 with respect to the flange 46 are assembled within a preset error range. The error of the rotation locus of 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, in the case where the recording head and the reproducing head are attached to the rotating drum 8 as described above, when only the rotating drum 8 is replaced, recording is performed with the rotating drum 8 attached to the rotating drum portion 1a. It is necessary to adjust the rotation trajectory of the head and the reproducing head. However, if the fixed upper drum 7 in which the rotating drum 8 is incorporated as described above is replaced, recording is performed with the rotating shaft 44, the flange 46 and the rotating drum 8 attached to the fixed upper drum 7 in advance. It is possible to adjust the rotational trajectory of the head or the reproducing head. Then, by incorporating the rotating drum 8 in advance and replacing the fixed upper drum 7, which has adjusted the rotational loci of the recording head and the reproducing head, the rotational loci of these heads can be easily adjusted.

By the way, two slits 5C and 5 are formed in the supporting portion 5 for supporting the fixed upper drum 7 and the fixed lower drum 6.
D is formed and, as shown in FIG. 3, notches 5A and 5B are formed so as to communicate with the slit 5C.

Therefore, the supporting portion 5 is divided into the upper drum fixing portion 5E for supporting the fixed upper drum 7 and the 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 are divided. 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. 3 and in the direction opposite to the arrow d in accordance with the applied voltage value. Thus, by controlling the voltage applied to the piezoelectric actuator 10A and 10B, respectively, for example by expanding the piezoelectric actuator 10B with reducing the piezoelectric actuator 10A, as shown in FIG. 4 (B), the fulcrum of the coupling portion 69 O ₂ The upper drum fixing portion 5E inclines 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 5 is centered on the fulcrum O ₂ of the connecting portion 69.
E inclines in the direction opposite to the arrow a in FIG.

As a result, as shown in FIG. 5A, in which the support portion 5 in FIG. 4B is viewed as the rotary drum portion 1a from the opposite side of the paper surface, the fixed upper drum 7 is in a horizontal state, for example, piezoelectric. When the actuator 10A 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 is correspondingly moved in the direction indicated by the arrow a, as shown in FIG. Lean on. 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 indicated by the arrow a in FIG. 2B, and as a result, the head fixed to the rotating drum 8 is fixed. 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.

When the fixed upper drum 7 is driven horizontally so that the piezoelectric actuator 10A is extended and the piezoelectric actuator 10B is contracted as shown in FIG. 5A, as shown in FIG. 5C. In response to this, the fixed upper drum 7 fixed to the upper drum fixing portion 5E inclines in the direction of arrow a in FIG. 5C. 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 arrow a in FIG. 5C, and as a result, the head fixed to the rotating drum 8 is fixed. 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 amount of expansion and contraction of A and 10B by the voltage value applied thereto, the scanning locus of the 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. 3, 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 in which it comes close 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 tilt adjusting portion 5G is displaced with respect to the lower drum fixing portion 5F by the piezoelectric actuator 62 in the direction indicated by the arrow b in FIG. 2, the tilt adjusting portion 5G is connected to the tilt adjusting portion 5G. The fixed upper drum 7 can be displaced via the fixed upper drum fixing portion 5E. The displacement direction of the fixed upper drum 7 is the direction indicated by the arrow c in FIG. 2 centering on the fulcrum O ₁ of the connecting portion 75 of the support portion 5.

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. 2 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 (A) of FIG. 6 in which the support section 5 of FIG. 4B is viewed as the rotary drum section 1a from the opposite side of the drawing, from the state in which the fixed upper drum 7 is horizontal, 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 in response thereto. 6B together with the fixed upper drum 7
Tilt in the direction indicated by the middle arrow c, and as a result, the rotating drum 8
The locus of the head fixed to can be displaced upward 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.

Further, from the horizontal state of the fixed upper drum 7 as shown in FIG. 6A, for example, as shown in FIG. 6C, the fixed upper drum 7 is moved by the piezoelectric actuator 62.
6 is displaced in the direction of arrow c in FIG. 6C, 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 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. be able to.

By adjusting the expansion / contraction amount of the piezoelectric actuator 62 in this way, the scanning locus of each 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.

The rotating drum 8 of the rotating drum portion 1a
An area of the lower surface 8C where each head is not provided is mirror-finished, and the above-described distance sensor 11B is fixed at a position of the fixed lower drum 6 facing the lower surface 8C, as shown in FIG. There is. This distance sensor 11B is
A laser diode that irradiates the lower surface 8C of the rotating drum 8 with laser light, and a light receiving portion that receives the reflected laser light reflected by the lower surface 8C, and the distance between the distance sensor 11B and the lower surface 8C at this light receiving position. Is to detect. 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 unit 1a has distance sensors 11A, 1 having the same structure as the distance sensor 11B.
1C 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 shaft 44, as shown in FIG. 4A showing the upper surface of the rotating drum portion 1a. 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. 3, 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.

Further, 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 the present configuration example will be described together with the operation of the rotary drum section 1a.

Returning to FIG. 1, when recording an image, digital image data or 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 between 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 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 generating circuit 26, for example, and also makes 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 generation 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 each head provided on the rotating drum 8.

On the other hand, the system controller 12 controls the reel and capstan control unit 4 when recording an 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 system controller 12 is provided with a servo control circuit 18. The servo control circuit 18 is a control for inverting the tape running direction from the FWD direction to the REV direction based on a tape inversion signal generated by the system control 2 itself or a tape inversion signal from a control panel (not shown). The signal is sent to the reel and capstan control circuit 4. In addition, the servo control circuit 18 at this time reads the rotation phase of the rotating drum 8 from the drum PG, and the read rotation phase and the read rotation phase are recorded on the control track in the longitudinal direction of the magnetic tape during recording in the FWD direction, for example. Based on the control signal (CTL signal),
Match the recording timing in the REV direction. The system controller 12 controls the switching by the switching circuit 16 based on the recording timing by the servo control circuit 18. The relationship between the number of rotations of the rotating drum 8 and the running speed of the magnetic tape, and the recording pattern formed on the magnetic tape according to the switching by the switching circuit 16 will be described later.

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

The reference voltage generation 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 drive 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.

As described above, 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 recording is performed on the magnetic tape 40 running in the FWD direction, the system controller 12 controls the reference voltage generating circuit 13 to extend one piezoelectric actuator and contract the other piezoelectric actuator. Thus, as shown in FIG. 8, recording is performed with the fixed upper drum 7 being inclined in the direction of arrow a in FIG. As a result, the head provided on the rotating drum 8 scans the magnetic tape 40 at a predetermined inclination angle, so that the recording track TR _{F in the} FWD direction is formed on the magnetic tape 40. .

On the other hand, when recording is performed on the magnetic tape 40 traveling in the REV direction at the same speed as traveling in the FWD direction, the system controller 12 controls the reference voltage generating circuit 13 to make the FWD direction. In contrast to time, by contracting one piezoelectric actuator and extending the other piezoelectric actuator, recording is performed with the fixed upper drum 7 tilted in the direction of arrow a in FIG. 9 as shown in FIG. As a result, the head provided on the rotating drum 8 scans the magnetic tape 40 at a predetermined inclination angle, that is, the same inclination angle as in the FWD direction, and therefore, the recording track in the REV direction on the magnetic tape 40. TR _R will be formed.

When the magnetic tape is stopped to stop running, the system controller 12 controls the reference voltage generating circuit 13 to move the fixed upper drum 7 to the fixed lower position as shown in FIG. 5 (A). It is horizontal with the drum 6. As a result, the head provided on the rotating drum 8 causes the magnetic tape 40 to move on the magnetic tape 40 at a predetermined inclination angle, that is, FWD.
The scanning is performed at the same inclination angle as the direction and the REV direction.

Thus, the digital VTR of this configuration example
It is possible to match the tilt angles of the recording tracks in the FWD direction, the REV direction, and the still state.

As described above, the digital V of the configuration example of the present invention is
According to TR, it is possible to match the inclination angles of the recording tracks in the FWD direction and the REV direction when performing reciprocal recording. Therefore, when recording is performed in the FWD direction, for example, an interval of one track is provided. In this way, a recording track is formed on the magnetic tape, for example, after traveling to the end of the tape, it is reversed in the REV direction without changing the traveling speed of the magnetic tape. The RE that fills the space between recording tracks
If recording is performed in the V direction, good reciprocal recording can be performed without the recording track in the FWD direction and the recording track in the REV direction overlapping. Of course, also in the case of reproduction, when reproducing in the FWD direction, only the recording track formed at the time of recording in the FWD direction can be reproduced.
Even during reproduction in the EV direction, it is possible to reproduce only the recording track formed during recording in the REV direction.

In this configuration example, a pair of recording heads H _R1 and H _R2 are arranged on the rotating drum 8 at 180 ° opposite to each other as shown in FIG. The reproducing heads H _P1 and H _P2 are arranged at 180 ° opposite positions. Further, in terms of signal crosstalk from the recording heads H _R1 and H _R2 to the reproducing heads H _P1 and H _P2 when recording signals are formed by forming recording tracks on the magnetic tape, the reproducing heads H _P1 and H _{P2 are considered.} the so it is not preferable to place in proximity to the recording head H _R1 and H _R2, these reproducing head H _P1 and H _P2, the recording head H _R1 and H _R2 as shown in Figure 10 on the rotating drum 8
From the recording heads H _R1 and H _{R2 at} a position separated by a predetermined angle θ from the recording heads H _R1 and H _{R2 in a} direction delayed from the rotation direction of the rotating drum 8, that is, a direction opposite to the rotation direction. ing. Further, as shown in FIG. 11, the recording heads H _R1 and H _R2 and the reproducing heads H _P1 and H _P2 are respectively head substrates (head bases).
It is bonded to the rotary drum 8 with a screw 57 shown in FIG. 10 through a hole 300 provided in the head substrate 56.

As shown in FIGS. 12 and 13, the recording heads H _R1 and H _R2 are each provided with a plurality of gaps. In this configuration example, the recording heads H _R1 have three gaps.
An example is shown in which one gap G ₁ , G ₂ , G ₃ is provided, and the recording head H _R2 is also provided with three gaps G ₄ , G ₅ , G ₆ . The gaps G ₁ , G ₂ , G ₃ of the recording head H _R1 all have the same azimuth direction, each has a width corresponding to one track, and the gaps G ₁ , G ₂ , G _{3 are the same.}
Are arranged so that the center lines (center lines in the scanning direction) are separated by a distance corresponding to approximately two tracks. Similarly, the gaps G ₄ , G ₅ , and G _{6 of} the recording head H _R2 are
All have the same azimuth direction, each has a width corresponding to one track, and each gap G ₄ , G ₅ , G ₆
The center lines are also separated by a distance corresponding to about two tracks. That is, the pitch between the gaps of these recording heads corresponds to the two track pitches in the format of the recording tracks formed on the magnetic tape. However, each gap G ₁ of the recording head H _R1 ,
The azimuth direction of G ₂ and G _{3 and} the azimuth directions of the gaps G ₄ , G ₅ and G ₆ of the recording head H _R2 are different from each other, and in this configuration example, for example, each gap G of the recording head H _{R1. 1} , G ₂ , G ₃ have azimuths in the counterclockwise (CCW) direction, and the gaps G ₄ , G ₅ , G ₆ of the recording head H _R2 have azimuths in the clockwise (CW) direction. Note that F
Strictly speaking, the distance between tracks formed by the same azimuth gap in the WD direction (track pitch) and the distance between tracks formed by the same azimuth gap in the REV direction (track pitch) are different, The physical distance gl between the gaps provided in one head is about 300 μm, and the difference in the track pitch is 0.1 μm, which is very small and can be ignored. There is.

When the above-described rotating drum 8 is rotated and the magnetic tape is run in the FWD direction or the REV direction and the recording heads H _R1 and H _R2 form diagonal recording tracks on the magnetic tape, The relationship between the number of rotations of the rotating drum 8 and the running speed of the magnetic tape is controlled so that the magnetic tape runs a distance corresponding to a width of 6 tracks during one rotation of the rotating drum 8. That is, while the drum 8 is rotating half a revolution,
The magnetic tape travels a distance corresponding to the width of three tracks.

With the relationship between the rotational speed and the tape running speed as described above and the magnetic tape running in the FWD direction, the magnetic tape and the head sliding surface viewed from the direction of arrow A in FIG. As shown in the enlarged view of FIG. 12, first, the gaps G ₁ , G ₂ , and G of the preceding recording head H _R1 are _{first formed} .
Each recording pattern PT _A , P on the magnetic tape by ₃
T _C, after the PT _E is formed, the rotating drum 8 is a magnetic tape by a distance corresponding to the width of three tracks is when half turn travels. Here, for example, _assuming that the recording head H _R1 and the recording head H _R2 on the rotating drum 8 have the same disposition height, the gap among the gaps of the recording head H _R2 that scans next on the magnetic tape. The recording pattern formed by G ₄ is the gap G of the recording head H _R1 .
₂ and the recording pattern PT _C formed by G _3, will be formed between the PT _E. However, in this case, no pattern is formed between the recording patterns PT _A and PT _C formed by the gaps G ₁ and G ₂ of the recording head H _R1 . Therefore, in this configuration example, the rotation during placement height on the drum 8 of the recording head H _R2, only twice ie 2 × Delta] h of height Delta] h, which corresponds to the width of the recording track, the recording head H _R1 It is designed to be higher than the placement height. As a result, on the magnetic tape running in the FWD direction, first, as shown in FIG. 12, each gap G of the recording head H _R1.
Recording patterns PT _A , PT _C , PT _E depending on ₁ , G ₂ , G ₃
After the formation of the recording heads, the rotating drum 8 makes a half rotation and the recording patterns PT _B , PT _D , and PT _F formed by the gaps G ₄ , G ₅ , and G ₆ of the recording head H _R2 are _R1
Each gap G _1, G _2, the recording pattern formed by G ₃ PT _A of, PT _C, will be formed between the PT _E.

On the other hand, when the magnetic tape is run in the REV direction, the preceding recording head is the recording head H _R2 , which is opposite to the above FWD direction. Here, in the state in which the magnetic tape has a relationship between the rotational speed and the tape running speed and the magnetic tape is running in the REV direction, an arrow A in the drawing of FIG.
Fig. 1 Enlarging the magnetic tape and the sliding surface of the head when viewed from the direction.
As shown in FIG. 3, first, after the recording patterns PT _B , PT _D , and PT _F are formed on the magnetic tape by the gaps G ₄ , G ₅ , and G _{6 of the} preceding recording head H _R2 ,
When the rotating drum 8 makes a half rotation, the magnetic tape runs for a distance corresponding to the width of three tracks. Here, for example, if the recording head H _R1 and the recording head H _R2 on the rotating drum 8 have the same arrangement height, for example, the gaps among the respective gaps of the recording head H _R1 which is the following head. The recording pattern formed by G ₃ comes to be formed between the recording patterns PT _B and PT _D formed by the gaps G ₄ and G ₅ of the recording head H _R2 . However, as described above with reference to FIG. 12, in the present configuration example, the arrangement height of the recording head H _{R2 on} the rotating drum 8 is set to be 2 × Δh higher than the arrangement height of the recording head H _R1 . In other words, the arrangement height of the recording head H _R 1 on the rotating drum 8 is set to be 2 × Δh lower than the arrangement height of the recording head H _R2 . Therefore, RE
Even when traveling in the V direction, first, after the recording patterns PT _B , PT _D , and PT _F are formed by the gaps G ₄ , G ₅ , and G _{6 of the} preceding recording head H _R2 , the rotating drum 8 is formed.
The recording pattern PT _A formed by the gaps G ₁ , G ₂ and G ₃ of the recording head H _R1 which is rotated by a half turn.
As shown in FIG. 13, PT _C and PT _E are recording heads H _R2
Are formed between the recording patterns PT _B , PT _D , and PT _F formed by the respective gaps G ₄ , G ₅ , and G ₆ .

From the above, according to this configuration example, the rotating drum 8 having the recording heads H _R1 and H _R2 is provided.
When recording is performed on a magnetic tape by using the above-mentioned method, if the relation between the traveling speed of the magnetic tape and the rotation speed of the rotating drum 8 is recorded as described above, the FW is recorded on the magnetic tape.
Six recording tracks are sequentially formed in the D direction or the REV direction.

When the magnetic tape is run in one running direction to form a recording track in the above-described relationship between the number of rotations and the tape running speed, the rotating drum 8 is rotated once. After the six recording tracks are formed, the formation of the recording tracks is stopped, for example, during the next one rotation of the rotating drum 8. By doing so, the magnetic tape has a portion composed of six recording tracks formed when the tape is running and a portion corresponding to six recording tracks where no recording tracks are formed when the tape is running. It will be arranged alternately.

Therefore, for example, as shown in FIG.
The magnetic tape 40 is made to run in the FWD direction, and the magnetic tape 40 has a portion composed of six recording tracks TR _F.
After recording such that the recording tracks are not formed and the portions corresponding to the six recording tracks are alternately arranged,
When recording is performed in the REV direction by reversing the running direction of the magnetic tape 40, similarly, a portion of the magnetic tape 40 which is composed of six recording tracks TR _R and six recording tracks in which no recording tracks are formed. If the recording is performed such that the portions corresponding to are alternately arranged, as shown in FIG. 15, 6 in the FWD direction is recorded on the magnetic tape 40.
The recording tracks TR _F for the number of lines and the recording tracks TR _R for the number of six in the REV direction having the same inclination angle as the recording track TR _{F in the} FWD direction are alternately arranged. However, when the recording track TR _F is first formed in the FWD direction as described above, the six recording tracks TR _F formed in the REV direction are inserted between the six recording tracks TR _F formed in the FWD direction. To be,
The traveling speed of the magnetic tape 40 and the rotational speed of the rotating drum 8 are controlled, and the tilt angle of the recording track TR _R formed in the REV direction is set to the FWD as described above.
Control is performed so as to match the tilt angle of the recording track TR _F formed in the direction.

Thus, in this digital VTR, F
It is possible to perform reciprocal recording in the WD direction and the REV direction.

Next, in the digital VTR of the configuration example of the present invention, the reciprocal recording as described above can be realized, and
At the time of recording, the above-mentioned CONFI reproduction can be performed.

Here, first, before describing the structure of a reproducing head capable of realizing CONFI reproduction at the time of reciprocal recording in the digital VTR of the structural example of the present invention, a general CONFI reproduction at the time of reciprocal recording is explained. Explain the problem.

For example, as shown in FIG.
0 while located at a distance by an angle θ reproducing head H _P from the recording head H _R for the same reason, the recording head H _R and rotating the same arrangement height of the reproducing head H _P drum 2
The case where 08 is used is taken as an example.

For example, as shown in FIG. 17, when the recording track TR _F is formed by the gap G _R of the recording head H _{R on} the magnetic tape 240 running in the FWD direction,
Gap G _P of the reproducing head H _P is to reach to a position where the leading edge of the recording track on the magnetic tape 240 is formed, the gap of the recording head H _R G _R recording track TR
It will be delayed by the time Δt from the time when the formation of _F is started. Note that the alternate long and short dash line in the drawing of FIG. 17 indicates the center line of the traveling locus of the gap. Also, during the time Δt,
The magnetic tape 240 moves by a distance Δt × V _t (V _t is a tape running speed), compared with when the gap G _R of the recording head H _R starts forming the recording track TR _F. This moving amount (Δt × V _t ) is used as the rotating drum 208.
When expressed as the difference in the height direction with respect to the upper recording head H _R, it can be expressed as the height indicated by Δh in the drawing of FIG.

On the other hand, as shown in FIG. 18, for example, REV
Tape running in the same direction as in the FWD direction 2
Against 40, when the form of the recording track TR _R by a gap G _R of the recording head H _R, the gap G _P of the reproducing head H _P is the leading edge of the recording track on the magnetic tape 240 is formed to reach to a position where there, the gap G _R of the recording head H _R is delayed by the time Δt than the time of starting to form a recording track TR _R in the REV direction. Similarly, during the time Δt, the magnetic tape 240 moves by the distance Δt × V _t , compared with when the gap G _R of the recording head H _R forms the recording track TR _R , and this movement. If the amount (Δt × V _t ) is represented as a difference in the height direction with respect to the recording head H _R on the rotating drum 208, it can be represented as Δh in the drawing of FIG. 18.

Thus, the rotating drum 208 of FIG.
In order to realize CONFI reproduction at the time of reciprocal recording using, the arrangement height of the reproducing head H _P1 arranged on the rotating drum 208 is set to be Δh above or below the recording head H _R. I have to adjust. That is, for example, at the time of FWD direction was adjusted to be lower by Δh than the arrangement height of the reproducing head H _P arranged height recording head H _R, and the time REV direction reverse playback head H arranged height of _P recording head H _R It will be adjusted so as to be higher than the arrangement height of by Δh.

[0085] However, in VTR capable of reciprocal printing, the placement height of the reproducing head H _P being arranged on the rotating drum 208 as described above, by changing each time the running direction of the magnetic tape is reversed, It is very difficult in terms of configuration complexity and cost. Further, if the arrangement height of the reproducing head H _P is adjusted to be either Δh above or below the recording head H _R , CONFI reproduction cannot be performed during the reciprocal recording. That is,
As shown in FIG. 19, the locus SC _F of scanning the gap G _P of the reproducing head H _P is the time of FWD direction, the distance between the locus SC _R for scanning gap G _P of the reproducing head H _P is at REV direction, during rotation When expressed as a difference in the height direction with respect to the recording head H _R on the drum 208, it corresponds to 2 × Δh, and from the deviation of the scanning locus of the reproducing head H _P in the FWD direction and the REV direction, Play head H _P
If the arrangement height of C is adjusted only to one of the upper and lower sides with respect to the recording head H _R , the
ONFI playback cannot be performed.

On the other hand, in the digital VTR of the configuration example of the present invention, when the recording head is provided with a plurality of gaps as described above, the reproducing head is provided with a plurality of gaps which is one more than the number of gaps of the recording head. By being provided, the CONFI reproduction at the time of reciprocal recording is realized. That is, as described above, there are three gaps G ₁ , G ₂ , and G ₃ in the recording head H _R1 and the recording head H _R2 , respectively.
And the gaps G ₄ , G ₅ , and G ₆ are provided, the reproducing head H corresponding to these recording heads H _R1 and H _R2.
The _P1 and reproducing head H _P2, one more gap G ₁₀ than the number of gaps of the recording _{head, G 11, G 12, G} 13 and the gap G
By providing ₁₄ , G ₁₅ , G ₁₆ , and G ₁₇ , CONFI reproduction at the time of reciprocal recording is realized. Here, the gaps G ₁₀ , G ₁₁ , and G of the reproducing head H _P1 are
₁₂ and G ₁₃ all have the same azimuth direction as the respective gaps of the recording head H _R1 , each has a width corresponding to one track, and each of the gaps G ₁₀ , G ₁₁ , G ₁₂ , and G ₁₃ The center lines (center lines in the scanning direction) are arranged so that the distance between them is approximately two tracks. Similarly, the gaps G ₁₄ , G ₁₅ , G ₁₆ , and G of the reproducing head H _P2 are the same.
Reference numeral ₁₇ has all the same azimuth directions as the gaps of the recording head H _R2 , each has a width corresponding to one track, and the center lines of the gaps G ₁₄ , G ₁₅ , G ₁₆ , G ₁₇ are the same. Are also separated by a distance corresponding to approximately two tracks.

First, the positional relationship between the reproducing head and the recording head in the case of performing CONFI reproduction during recording in the FWD direction in the digital VTR of the configuration example of the present invention will be described. In the following description, of the recording heads H _R1 and H _R2 and the reproducing heads H _P1 and H _P2 provided on the rotating drum 8 shown in FIG. 10, the recording head H _R1 and the reproducing head H _{P1 are representatively shown.} The relationship between the recording head H _R2 and the reproducing head H _P2 is the same and will be omitted.

On the rotating drum 8, a position separated from the recording head H _R1 by a predetermined angle θ as described above (the recording head is separated from the recording head by an angle θ in a direction delayed from the rotating direction of the rotating drum 8). The reproducing head H _P1 is located at the position). Further, as described above, the rotating drum 8 is set to 1
With each rotation, the recording heads H _R1 and H _R2 form six recording tracks. Therefore, the amount of movement of the magnetic tape 40 during the rotation of the rotating drum 8 by the angle θ is θ / 360 ° × 6. Therefore, the arrangement height of the reproducing head H _P1 is θ / θ relative to the recording head H _R1 . If the recording heads formed by the recording heads H _R1 are installed by changing the positions by 360 ° × 6 tracks, the reproducing heads H _R1
P1 enables CONFI reproduction.

For example, when θ = 60 ° (360 ° / 6 (total recording gap)), as shown in FIG. 20, the recording head H _{R1 is} lowered by a height Δh corresponding to one track. If the reproducing head H _P1 is installed, the CONFI reproduction at the time of recording in the FWD direction becomes possible. That is, when recording in the FWD direction, as shown in FIG. 21, the gap G _1, G _2, the recording pattern formed by G ₃ PT _A recording head H _R1, PT _C, over PT _E, gap G _10, G _11, G ₁₂ of the reproducing head H each gap G _10, G ₁₁ of _P1, G _12, G ₁₃ is able to trace. More specifically, during recording in the FWD direction, the signal of the recording track formed in the gap G ₁ of the recording head H _R1 is reproduced in the gap G ₁₀ of the reproducing head H _P1 and the recording head H _R1 The signal of the recording track formed by the gap G ₂ of the read head is the gap G of the reproducing head H _P1 .
The signal of the recording track reproduced at _{11 and} formed at the gap G ₃ of the recording head H _R1 is reproduced at the gap G ₁₂ of the reproducing head H _P1 . At this time, no signal is reproduced in the gap G ₁₃ of the reproducing head.

On the other hand, as described above, the reproducing head H _P1 is arranged on the rotating drum 8 with its height lower than that of the recording head H _R1 by Δh, so that the magnetic tape runs in the REV direction. when brought into, as shown in FIG. 22, each gap G _1, G _2, the recording pattern formed by G ₃ PT _a recording head H _R1, PT _C, on PT _E, the reproducing head H _P1
It is possible to trace the gaps G ₁₁ , G ₁₂ , and G ₁₃ among the respective gaps G ₁₀ , G ₁₁ , G ₁₂ , and G ₁₃ . More specifically, during recording in the FWD direction, the signal of the recording track formed in the gap G ₁ of the recording head H _R1 is reproduced in the gap G ₁₁ of the reproducing head H _P1 and the recording head H _R1 Of the recording track formed by the gap G ₂ of the reproducing head H _P1 is reproduced by the gap G ₁₂ of the reproducing head H _P1 , and the signal of the recording track formed by the gap G ₃ of the recording head H _R1 of the reproducing head H _P1 . Played at gap G ₁₃ . At this time, no signal is reproduced in the gap G ₁₀ of the reproducing head.

In the case of the recording head H _R2 and the reproducing head H _P2 , the recording head H _R1 and its gaps G ₁ , G ₂ , G ₃ are referred to as the recording head H _{R2 in} the above description of FIGS. 20 to 22. Instead of the gaps G ₃ , G ₄ , and G ₅ , the reproducing head H _P1 and its gaps G ₁₀ , G ₁₁ , G ₁₂ , and G ₁₃ are _replaced with the reproducing head H _P2 and its gaps G ₁₄ , G ₁₅ , G ₁₆ , and G _17. If changed to, the CONFI reproduction can be performed as described above.

As described above, the digital V of the configuration example of the present invention is
The TR is capable of reciprocal recording, and the number of gaps of the reproducing head is 1 more than the number of gaps of the corresponding recording head.
By increasing the number by one and arranging it on the rotating drum at a position delayed by an angle θ (360 ° / total number of gaps of the recording head) from the recording head, the FWD direction and the REV are increased.
It enables CONFI reproduction in both directions. That is, in a digital VTR capable of reciprocal recording, C
When realizing ONFI reproduction, it is not necessary to provide a dedicated reproduction head for each of the forward and backward paths in the FWD direction and the REV direction. Therefore, it is possible to reduce the cost by reducing the number of reproduction heads and the number of reproduction circuits. ing.

In the above description, an example in which two recording heads each have three gaps and two reproducing heads each have four gaps has been described, but the number of recording heads and the number of gaps are also described. Is not limited to these, and when the recording head has N gaps, the reproducing head has N + 1 gaps, and the reproducing head on the rotating drum and the recording head on the rotating drum. On the other hand, 36
It is arranged at a position separated by an angle of 0 ° / (the total number of gaps of the recording head) and lower than the height of the recording head by an amount corresponding to one recording track width. When the number of recording heads is M and the number of reproducing heads corresponding to each recording head is M, the N gaps of each recording head are separated by a distance corresponding to the recording track width of M−1. At the same time, the N + 1 gaps of the reproducing heads are separated by a distance corresponding to the recording track width of M-1 lines. At the same time, on the rotating drum at this time, the reproducing heads are arranged lower than the arrangement height of the corresponding recording heads by an amount corresponding to one recording track width.

Returning to FIG. 1, when reproducing (including CONFI reproducing) the magnetic tape on which the video data is recorded as described above, the system controller 12 is
The reel and capstan control unit 4 is controlled to run the magnetic tape at the same speed as during recording in the FWD direction or the REV direction, and the rotating drum 8 is rotated at the same speed as during recording.

That is, also during this reproduction, the rotating drum 8 of FIG. 10 is used, and the system controller 12 determines the inclination of the fixed upper drum 7 according to the running direction of the tape as in the case of recording. It is variable as shown in FIG. 8 or FIG. As a result, the reproducing heads H _P1 and H _P2 provided on the rotating drum 8 can scan the respective recording tracks formed during the above-described recording. These respective reproducing heads H _P1, H _P2, obtained by the reproduced recording tracks of the FWD direction or REV direction, the reproduction signal of the recording track is sequentially supplied to the switching circuit 16.

The switching circuit 16 controls each reproducing head H _P1 ,
When playback signals are supplied from _HP2 , these playback signals are
The signals are sequentially supplied to the demodulation circuit 31. Demodulation circuit 31, a reproduction signal from the reproducing head H _P1, H _P2 binarized, further 8-14 performs processing such as demodulation corresponding to the modulation form reproduced data, the reproduction data to the memory 32 send.

Here, the switching unit 300, which is a configuration in the switching circuit 16 necessary for performing CONFI reproduction.
Is as shown in FIG. Note that this FIG.
However, for example, only the reproduction signal from the reproduction head H _P1 will be described, and the reproduction head H _P2 is the same, and will be omitted.

That is, in FIG. 23, the terminal 34
0 is supplied with the reproduction signal from the rotating drum 8, and the switching terminal 311 in the switching unit 300 is supplied with the reproduction head HP ₁
Reproduction signal from the gap G ₁₀ of the reproduction signal from gap G ₁₁ of the reproducing head H _P1 to the switching terminal 312, the reproduced signal from gap G ₁₂ of the reproducing head H _P1 to the switching terminal 313, A reproduced signal from the gap G ₁₃ of the reproducing head H _P1 is supplied to the switched terminal 313. Further, a switching control signal from the system controller 12 is supplied to the terminal 340. When the tape running direction is the FWD direction, the switching control signal is the switched terminal 31.
0 and common terminal 301, switched terminal 311 and common terminal 30
2. Instructing connection between the switched terminal 312 and the common terminal 303. As a result, a signal reproduced from the recording track formed in the gap G ₁ of the recording head H _R1 in the gap G ₁₀ of the reproducing head H _P1 and the recording track formed in the gap G ₂ of the recording head H _R1 are recorded. Playhead H _P1
Signal reproduced in the gap G _{11 of} the recording head H _R1 and a signal reproduced in the gap G _{12 of} the recording head H _P1 of the recording track formed in the gap G ₃ of the recording head H _R1 in the CONFI reproduction in the FWD direction. The output of the switching unit 300 is sent from the terminal 341 to the demodulation circuit 31.

On the other hand, in FIG. 23, when the tape running direction is the REV direction, the switching control signal is
Switched terminal 311, common terminal 301, switched terminal 312
, Common terminal 302, switched terminal 313, and common terminal 303
Will be instructed to connect. As a result, the signal reproduced from the recording track formed in the gap G ₁ of the recording head H _R1 in the gap G ₁₁ of the reproducing head H _P1 and the recording track formed in the gap G ₂ of the recording head H _R1 are recorded. a signal reproduced by the gap G ₁₂ of the reproducing head H _P1, the signal obtained by reproducing the recording tracks formed by the gap G ₃ of the recording head H _R1 in the gap G ₁₄ of the reproducing head H _P1 is, when the REV direction The output of the switching unit 300 in the CONFI reproduction from the terminal 341 to the demodulation circuit 3
Will be sent to 1.

In the case of the recording head H _R2 and the reproducing head H _P2 , the recording head H _{R1 will be} described in the explanation with reference to FIG.
And the gaps G ₁ , G ₂ and G ₃ thereof are changed to the recording head H _R2 and the gaps G ₃ , G ₄ and G ₅ thereof, and the reproducing head H _P1 and the gaps G ₁₀ , G ₁₁ , G ₁₂ and G ₁₃ thereof are reproduced. in other head H _P2 and its gap _{G 14, G 15, G 16} , G 17, the above description similarly CONFI play.

The reproduction data demodulated by the demodulation circuit 31 as described above and stored in the memory 32 is sent to the decoding circuit 33, where it is subjected to error correction processing and decoding processing.

The reproduction 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.

[0104]

According to the present invention, the recording head having N gaps and the reproducing head having N + 1 gaps are arranged, and the reproducing head is 360 ° in the direction opposite to the drum rotation direction with respect to the recording head. A rotary drum arranged at a position separated by an angle of / (total gap of recording heads) and lower than the height of the recording head by a width corresponding to one recording track; And a second traveling direction which is the opposite direction to the magnetic tape, the inclination angle driving means for making the inclination angle of the rotary drum the same, the first traveling direction of the magnetic tape and the second traveling direction.
At the time of recording in the traveling direction, the traveling locus of the preceding recording head is scanned by the following reproducing head to enable reciprocal recording / reproduction with respect to the magnetic tape, and it is also possible to perform reproduction simultaneously with recording.

[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 structural example applied to.

FIG. 2 is a cross-sectional view showing a specific configuration of a rotary drum that constitutes the digital VTR of this configuration example.

FIG. 3 is a perspective view showing a specific shape of a support portion that constitutes a rotary drum.

FIG. 4 is a diagram showing a specific shape of a rotary drum.

FIG. 5 is a diagram for explaining adjustment of the rotating drum in the azimuth direction.

FIG. 6 is a diagram for explaining the adjustment of the rotary drum in the tilt direction.

FIG. 7 is a diagram showing a configuration of a distance sensor that constitutes a rotary drum.

FIG. 8 is a diagram for explaining a control operation of a tilt angle of a rotary head portion in a FWD direction and a recording track formed on a magnetic tape.

FIG. 9 is a diagram for explaining a control operation of a tilt angle of a rotary head portion in a REV direction and a recording track formed on a magnetic tape.

FIG. 10 is a diagram showing an arrangement example of a recording head and a reproducing head on a rotating drum of a configuration example of the present invention.

FIG. 11 is a perspective view of a head body.

FIG. 12 is a diagram for explaining a print head gap and a print pattern in the FWD direction.

FIG. 13 is a diagram for explaining a print head gap and a print pattern in the REV direction.

FIG. 14 is a diagram showing recording tracks formed in the FWD direction.

FIG. 15 is a diagram showing recording tracks formed in the FWD direction and the REV direction.

FIG. 16 is a diagram used for explaining a general problem in CONFI reproduction during reciprocal recording.

FIG. 17 is a diagram used for explaining the traveling locus of the reproducing head during CONFI reproduction in the FWD direction.

FIG. 18 is a diagram used for explaining the traveling locus of the reproducing head during CONFI reproduction in the REV direction.

FIG. 19 is a diagram used for explaining the difference in the traveling locus of the reproducing head during CONFI reproduction in the FWD direction and the REV direction.

FIG. 20 is a diagram for explaining an arrangement height of a recording head and a reproducing head.

FIG. 21 is a diagram for explaining an arrangement height of a recording head and a reproducing head for realizing CONFI reproduction in the FWD direction.

FIG. 22 is a diagram for explaining an arrangement height of a recording head and a reproducing head for realizing CONFI reproduction in the REV direction.

FIG. 23 is a diagram showing a configuration of a main part in a switching circuit.

FIG. 24 is a diagram showing a configuration example of a rotary drum that constitutes a conventional digital VTR.

FIG. 25 is a diagram showing a recording format of a conventional digital VTR.

FIG. 26 is a diagram for explaining the difference between 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 in the conventional digital VTR.

FIG. 27 is a diagram for explaining a defect due to a difference between a tilt angle of a recording track formed in the FWD direction and a tilt angle of a recording track formed in the REV direction in a conventional digital VTR.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 rotary head part 1a rotary drum part 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 _HR1 , _HR2 recording head _HP1 , _HP2 reproducing head

Claims (8)

[Claims] 1. A rotary head device for obliquely scanning a magnetic tape, comprising: a recording head having N gaps; a reproducing head having N + 1 gaps; and the reproducing head with respect to the recording head. A rotary drum disposed at a position separated by a predetermined angle in a direction opposite to the drum rotation direction and lower than the recording head by a predetermined height; and a first running direction of the magnetic tape and a first running direction of the magnetic tape. A second traveling direction which is the opposite direction, and an inclination angle drive means for making the inclination angle of the rotary drum the same with respect to the magnetic tape, the first traveling direction of the magnetic tape and the second traveling direction of the magnetic tape. A rotary head device characterized in that, during recording, a traveling locus of a preceding recording head is scanned by a following reproducing head. 2. The predetermined angle is 360 ° when the running speed of the magnetic tape and the rotating speed of the rotating drum have such a relationship that the magnetic tape runs for N recording tracks per one rotation of the rotating drum. 2. The rotary head device according to claim 1, wherein the predetermined height corresponds to a recording track width of one line. 3. The M recording heads and the M reproducing heads corresponding to the recording heads are provided, and the recording heads respectively have the N gaps.
-1 is provided with a distance corresponding to the recording track width of one line, and each of the reproducing heads is provided with the N + 1 gaps with a distance corresponding to the recording track width of M-1 lines. The rotary head device according to claim 1, which is characterized in that: 4. When the relationship between the running speed of the magnetic tape and the number of rotations of the rotary drum is such that the magnetic tape runs for N × M recording tracks per rotation of the rotary drum, the predetermined angle is 4. The rotary head device according to claim 3, wherein the predetermined height is 360 [deg.] / (Total number of recording head gaps), and the predetermined height corresponds to one recording track width. 5. A recording head having N gaps and N.
And a reproducing head having a +1 gap, and the reproducing head is arranged at a position separated from the recording head in a direction opposite to the drum rotation direction by a predetermined angle and lower than the recording head by a predetermined height. And a recording signal generating means for generating a recording signal to be supplied to the recording head on the rotating drum, and a reproducing signal from a signal read from the magnetic tape by the reproducing head on the rotating drum. Reproduction signal generation means, tape running control means for controlling the running direction and running speed of the magnetic tape, rotation speed control means for controlling the number of rotations of the rotating drum, first running direction of the magnetic tape, and the first running direction. And a second traveling direction that is the opposite direction to the traveling direction of the magnetic tape. During the first running direction and the second direction of travel recording, the recording and reproducing apparatus, characterized by reproducing by the reproducing head to the succeeding recording track preceding recording head is formed. 6. The predetermined angle is 360 ° when the relationship between the running speed of the magnetic tape and the number of rotations of the rotary drum is such that the magnetic tape runs for N recording tracks per rotation of the rotary drum. 6. The recording / reproducing apparatus according to claim 5, wherein the predetermined height corresponds to a recording track width for one line. 7. A rotary drum is provided with M recording heads and M reproducing heads corresponding to the recording heads, and each recording head has M-1 gaps corresponding to M-1 gaps. And the reproducing heads are provided with the N + 1 gaps separated by a distance corresponding to the recording track width of M-1. The recording / reproducing apparatus according to claim 5. 8. The predetermined angle when the relationship between the running speed of the magnetic tape and the number of rotations of the rotating drum is such that the magnetic tape runs by N × M recording tracks per one rotation of the rotating drum. 8. The recording / reproducing apparatus according to claim 7, wherein the recording height is 360 [deg.] / (Total number of recording head gaps), and the predetermined height corresponds to a recording track width of one line.