JPH09180108A - Rotary head device and recording / reproducing device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To enable bidirectional recording on a magnetic tape. SOLUTION: The rotating drum 8 including a plurality of recording heads having a plurality of gaps, and the FWD direction and the REV direction of the magnetic tape running direction have the same inclination angle with respect to the magnetic tape. From the system controller 12 to the piezoelectric actuators 10A and 10B
And the switching circuit 16 for switching between the recording head that first scans the magnetic tape when recording in the FWD and the recording head that first scans the magnetic tape when recording in the REV direction.

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
As shown in FIG. 20, recording tracks 97 inclined by a predetermined angle are formed on the upper surface 2 without any gap.

[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-mentioned digital VTR, as shown in FIG. 21, 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 from each other. 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
22A, 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. 22A, and then recording is performed in the REV direction. 22B, even if the recording tracks 99R are formed on the magnetic tape 92 at intervals of one track as shown in FIG. 22B, As shown in FIG. 22C, the recording tracks are partially overlapped with each other, which makes it difficult to reproduce the signal. That is, FIG.
In the case of (C) of 2, 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.

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

[0012]

A rotary head device and a recording / reproducing device according to the present invention include a rotary drum having a plurality of recording heads having a plurality of gaps, and a first magnetic tape.
And a second traveling direction which is the opposite direction to the magnetic tape, the inclination angle drive means for making the inclination angle of the rotating drum the same with respect to the magnetic tape, and the magnetic tape is first recorded at the time of recording in the first traveling direction. The above problem is solved by switching between the recording head that scans upwards and the recording head that scans first on the magnetic tape during recording in the second traveling direction.

That is, according to the present invention, the inclination angles of the recording tracks formed on the magnetic tape are the same in the first traveling direction and the second traveling direction, and in the first traveling direction. By switching the recording head that first scans the magnetic tape during recording and during recording in the second traveling direction, it is possible to prevent overlapping of recording tracks during reciprocal recording.

[0014]

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 section 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 supporting 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 which expand and contract in accordance with the supplied voltage, extend over the lower drum fixing portion 5F and the upper drum fixing portion 5E, respectively. It is provided.

Further, the rotary head unit 1 has 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 to the switching circuit 16 for demodulation 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 more specifically. 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 in 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.
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 upper fixed drum 7 and the lower fixed 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 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 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 supporting portion 5 of 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.

Further, when the fixed upper drum 7 is driven in a horizontal state as shown in FIG. 5A so that the piezoelectric actuator 10A is extended and the piezoelectric actuator 10B is contracted, 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 of approaching the lower drum fixing portion 5F, that is, in the direction indicated 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 by the piezoelectric actuator 62 in the direction indicated by the arrow b in FIG. 2 with respect to the lower drum fixing portion 5F, it is coupled 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, from the state where the fixed upper drum 7 is horizontal as shown in (A) of FIG. 6 in which the support portion 5 of 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.

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 and 1A 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.

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 level 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 section 1a.

Returning to FIG. 1, when recording a video image, digital video data or an analog video 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 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 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 reverses the traveling direction of the tape from the FWD direction to the REV direction (or vice versa) based on the tape inversion signal generated by the system controller 12 itself or the tape inversion signal from the control panel 19. Is sent to the reel and capstan control circuit 4. Also, the servo control circuit 1 at this time
Reference numeral 8 indicates the rotational phase of the rotating drum 8 from the drum PG, and the read rotational phase and the control signal (CTL signal) recorded on the control track in the longitudinal direction of the magnetic tape during recording in the FWD direction, for example. Based on, the recording timing in the REV direction is adjusted. 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 control signal of the control track can be read by an audio head which is a fixed head, for example.

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 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 a 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, 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 running in the REV direction at the same speed as when running 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, the rotating drum
8 has a pair of recording heads, as shown in FIG.
De H_R1And H_R2Are placed 180 ° opposite each other and the same
A pair of reproducing heads H_P1And H_P2180 ° opposite each other
It is arranged in the position. Also, record tracks on the magnetic tape.
Recording head H for forming and recording signals_R1Over
And H_R2Playhead H_P1And H_P2Signal crossed to
The playback head H_P1And H_P2To the above record
Dead H_R1And H_R2Should not be placed close to
Therefore, these playback heads H_P1And H_P2Is a spinning Dora
The recording head H as shown in FIG._R1And H_R2
At a predetermined angle θ from the
Direction that is delayed with respect to the rotation direction of the ram 8, that is, the rotation direction
In the opposite direction to the recording head H_R1And H_R2From angle θ
It is located in a distant position). Further shown in FIG.
So that these recording heads H_R1, H_R2And playback head
H _P1, H_P2Each has a head substrate (head base)
56 is attached on the head substrate 56 and is attached to the head substrate 56.
The screw 57 shown in FIG.
And is mounted on the rotating drum 8.

Each of the recording heads H _R1 and H _R2 has a plurality of gaps, as shown in FIG. 12 which enlarges the magnetic tape and the head sliding surface as seen from the direction of arrow A in FIG. Therefore, in this configuration example, the recording head H _R1
Shows three gaps G ₁ , G ₂ , G ₃ and the recording head H _R2 also has three gaps G ₄ , G ₅ , G ₆ . Each of the gaps G ₁ , G ₂ , G of the recording head H _R1
3 all have the same azimuth direction, each has a width corresponding to one track, and each gap G ₁ , G ₂ ,
The center lines of G ₃ (center lines in the scanning direction) are arranged so as to be separated by a distance of 2 × Δh (Δh is a track pitch between adjacent tracks) corresponding to approximately two tracks.
Similarly, the gaps G ₄ , G ₅ , and G of the recording head H _R2 are the same.
₆ also have the same azimuth direction, each has a width corresponding to one track, and each gap G ₄ ,
The intervals between the center lines of G ₅ and G ₆ are also separated by a distance of 2 × Δh, which corresponds to approximately 2 tracks. That is, the pitch between the gaps of these recording heads corresponds to the 2-track pitch 2Δh in the format of the recording tracks formed on the magnetic tape. However, the azimuth direction of the gaps G ₁ , G ₂ , and G ₃ of the recording head H _R1 and the azimuth direction of the gaps G ₄ , G ₅ , and G ₆ of the recording head H _R2 are different from each other, and this configuration is adopted. In the example, for example, the gaps G ₁ , G ₂ , and G _{3 of the} recording head H _R1 are +, and the gaps G ₄ , G ₅ , and G ₆ of the recording head H _R2 are −.
It has azimuth.

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 rotational speed of the rotating drum 8 and the running speed of the magnetic tape is such that the magnetic tape runs a distance (6 × Δh) corresponding to the width of 6 tracks during one rotation of the rotating drum 8. Controlled by. That is, during the half rotation of the rotating drum 8, a distance (3 × Δ
Only h) the magnetic tape will run.

When the magnetic head _HR1 is the preceding recording head in a state where there is such a relationship between the number of revolutions and the tape traveling speed and the magnetic tape is traveling in the FWD direction, first, the gap G _1, G _2, each recording by G ₃ on the magnetic tape pattern PT _a recording head H _R1, PT _C, PT _E is formed. Next, the recording head H _R2
Has reached the magnetic tape, the magnetic tape has traveled a distance corresponding to the width of three tracks from the time when the magnetic head H _R1 reached the magnetic tape earlier. 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, the recording head H _R2 that scans on the magnetic tape next to the recording head H _R1 . The recording pattern formed by the gap G ₄ of each gap is the recording pattern P formed by the gaps G ₂ and G ₃ of the recording head H _R1.
T _C, will be formed between the PT _E. In other words, assuming that the recording head H _R1 and the recording head H _R2 are arranged at the same height on the rotating drum 8, of the gaps G ₁ , G ₂ , G ₃ of the recording head H _R1. First, the gap G ₁ that reaches the magnetic tape and the recording head H
_R2 in the gap G ₄ to first reach the magnetic tape out of the gap G _4, G _5, G ₆ is a, than the gap G ₁ of the recording head H _R2 of the gap G ₄ towards the recording head H _R1,
It will run on the magnetic tape at a position relatively lower by three tracks. However, in this case, the recording pattern PT _A formed by the gaps G ₁ and G ₂ of the recording head H _R1.
No pattern will be formed between PT _C and PT _C.

Therefore, in the case where the magnetic tape is run in the FWD direction as described above, and the magnetic head H _R1 is the preceding recording head, as shown in FIG. 12, first, the magnetic head H _R1. Each gap G ₁ , G ₂ ,
Recording pattern PT _A by G _3, PT _C, after the formation of the PT _E, the gap G ₄ of the rotating drum 8 the recording head H _R2 by a half turn, G _5, each recording pattern PT formed by G _{6 B} , PT _D and PT _F are recorded patterns P formed by the gaps G ₁ , G ₂ and G ₃ of the recording head H _R1.
In order to realize such a structure as formed between T _A , P T _C and P T _E , the arrangement height of the recording head H _{R2 on} the rotating drum 8 is set to be twice the recording track pitch ΔH. It is necessary to make the height corresponding to 2 × ΔH higher than the arrangement height of the recording head H _R1 .

In this way, the recording head H _R2 is arranged on the rotating drum 8 with a height corresponding to 2 × ΔH higher than the arrangement height of the recording head H _R1.
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. In the case where the magnetic tape is run in the FWD direction to form a recording track in the state where the above-described relationship between the number of rotations and the tape running speed is provided, the rotating drum 8 is rotated once to record six tracks. After the track is formed, during the next rotation of the drum 8 during the next rotation, the formation of the recording track is paused, for example. By doing so, as shown in FIG. 14, on the magnetic tape 40, the six recording tracks TR _FA , TR _FB , formed in order during the FWD running,
An FWD recording section composed of TR _FC , TR _FD , TR _FE , and TR _FF and a section corresponding to six recording tracks in which no recording track is formed during the FWD running are alternately arranged. The recording tracks TR _FA , T shown in FIG.
R _FB , TR _FC , TR _FD , TR _FE , and TR _FF are the recording patterns PT _A , PT _FB , PT _C , PT _D , and P of FIG. 12, respectively.
Corresponds to T _E and _P T _F.

On the other hand, the recording heads H _R1 and H _R2 are arranged as shown in FIG. 10, and the relationship between the rotational speed of the rotating drum 8 and the tape running speed of the magnetic tape has the above relationship. Then, let us consider recording when the magnetic tape is run in the REV direction, assuming that the recording head H _R1 and the recording head H _R2 are arranged at the same height on the rotating drum 8.

Here, also in the case of this REV direction, the above-mentioned F
Similar to the case of the WD direction, when the magnetic head H _R1 is the preceding recording head, for example, first, the recording head H
Each gap G ₁ of _R1, G _2, each recording by G ₃ on the magnetic tape pattern PT _A, PT _C, PT _E is formed. Next, when the recording head H _R2 arrives on the magnetic tape due to the half-rotation of the drum 8 during rotation, the recording head H _R2 is 3 times shorter than the time when the magnetic head H _R1 previously arrived on the magnetic tape.
The magnetic tape is running for a distance corresponding to the width of a track. At this time, for example, _assuming that the recording head H _R1 and the recording head H _R2 on the rotating drum 8 have the same height, the running direction of the magnetic tape in the REV direction is opposite to that in the FWD direction. _Therefore , among the gaps G ₁ , G ₂ , and G ₃ of the recording head H _R1 , the gap G ₁ that reaches the magnetic tape _first and the gaps G ₄ , G ₅ , and G ₆ of the recording head H _R2 are the same. among the in gap G ₄ to first reach the magnetic tape, than the gap G ₁ of the recording head H _R2 of the gap G ₄ towards the recording head H _R1, relatively three tracks on the magnetic tape (3 X Δh)), and the vehicle travels at a higher position.

However, as described in the description of the FWD direction, when the arrangement height of the recording head H _{R2 on} the rotating drum 8 is arranged higher than that of the recording head H _R1 by 2 × Δh. As shown in FIG. 14 in which the magnetic tape and the head sliding surface are viewed from the direction of arrow A in FIG. 11, the gap G ₄ of the recording head H _R2 is, for example,
The magnetic head travels at a position higher than the gap G ₁ of the recording head H _R1 by 5 × Δh (the sum of 3 × Δh and 2 × Δh) on the magnetic tape.

In this way, the recording head H _R2 is arranged on the rotating drum 8 with a height corresponding to 2 × Δh higher than the arrangement height of the recording head H _R1.
When recording on a magnetic tape traveling in the REV direction by using, when the recording is performed as described above with respect to the relationship between the traveling speed of the magnetic tape and the rotation speed of the rotating drum 8,
Six recording tracks are sequentially formed on the magnetic tape in the REV direction. In addition, in the state where the relationship between the number of revolutions and the tape running speed is provided, the magnetic tape is rotated
Even when the recording track is formed by traveling in the EV direction, the rotating drum 8 is rotated once to form six recording tracks, and then the recording track is formed during the next rotation of the rotating drum 8. For example, make it pause. By doing so, as shown in FIG. 15, on the magnetic tape 40, the six recording tracks TR _RE , TR _RC , TR _RA , TR _RF , TR _RD , TR formed in sequence during the REV running.
_It consists of _RB and between the recording tracks TR _RE and TR _RC ,
Between TR _RC and TR _RA , between TR _RF and TR _RD , TR _RD
REV with one recording track between TR _RB and TR _RB
The recording portions and the portions corresponding to the six recording tracks in which the recording tracks are not formed during the REV traveling are alternately arranged. The recording track TR of FIG.
_{RE, TR RC, TR RA,} TR RF, TR RD, TR RB is recording pattern PT _E, respectively, in FIG _{14, PT C, PT A,} P
It corresponds to _TF , PT _D , and PT _B.

Therefore, for example, when recording is performed in the REV direction by reversing the running direction of the magnetic tape 40 after recording as shown in FIG. 13 in the FWD direction, the recording on the magnetic tape 40 is performed. In this case, as shown in FIG. 16, there is a portion where the recording track is overwritten at the boundary between the FWD recording portion and the REV recording portion. That is, in FIG. 16, the recording track T formed in the FWD direction
_{R FA, TR FB, TR FC} , TR FD, TR FE, onto the recording track TR _FB and TR _FD and TR _FF of the TR _FF, recording tracks TR _RE formed during REV direction, TR _RC, T
Recording track T of R _RA , TR _RF , TR _RD , and TR _RB
It is recorded so that R _RF , TR _RD, and TR _RB overlap. When such overlapping of recording tracks occurs, it becomes impossible to correctly take out the signal recorded on the overlapping recording tracks during reproduction.

From the above, in the configuration example of the present invention,
As described with reference to FIGS. 12 and 13, the recording head H _R1 is used as the leading head and the recording head H _R2 is used as the trailing head when recording in the FWD direction. 11, the recording head _HR2 is used as a leading head and the recording head _HR1 is used as a trailing head, as shown in FIG.

That is, according to the example of FIG. 17, first, the recording patterns PT _B , PT _D , PT _F are formed on the magnetic tape by the gaps G ₄ , G ₅ , G _{6 of} the recording head H _R2.
Is formed. Next, when the recording head H _R1 reaches the magnetic tape due to the half-rotation of the rotating drum 8, the width becomes three tracks wider than the time when the magnetic head H _R2 reaches the magnetic tape first. The magnetic tape is running for a corresponding distance. At this time, for example, _assuming that the recording head H _R1 and the recording head H _R2 on the rotating drum 8 have the same height, the running direction of the magnetic tape in the REV direction is opposite to that in the FWD direction. in which for a gap G ₄ to first reach the magnetic tape out of the gap G _4, G _5, G ₆ of the recording head H _R2, for each gap G _1, G _2, G ₃ of the recording head H _R1 among the in gap G ₁ to first reach the magnetic tape, than the gap G ₄ towards the gap G ₁ of the recording head H _R1 recording head H _R2, relatively three tracks on the magnetic tape (3 X Δh)), and the vehicle travels at a higher position.

However, as described in the description for the FWD direction, in this configuration example, the arrangement height of the recording head H _{R2 on} the rotating drum 8 is 2 × Δh higher than that of the recording head H _R1.
In other words, the height of the trailing recording head H _{R1 on} the rotating drum 8 is 2 × Δh lower than that of the preceding recording head H _R2. Therefore, as shown in FIG. 17, 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 magnetic head H _R2 , the rotating drum 8 rotates half a turn. The recording head H _R1 with each gap G ₁ ,
Recording patterns PT _A and P formed by G ₂ and G ₃
T _C, the PT _E, the gap G ₄ of the recording head H _R2, G _5,
Each recording pattern PT _B , PT _D , P formed by G ₆
Can be formed during T _F.

As described above, in the configuration example of the present invention, the arrangement height of the recording head H _{R2 on} the rotating drum 8 is set higher than that of the recording head H _R1 by 2 × Δh, and the FW is increased.
When recording in the D direction, the recording head H _R1 is used as the preceding head, while when recording in the REV direction, the recording head H _R2 is used as the preceding head, and when recording in the FWD direction and R
By maintaining the relationship between the rotational speed of the rotating drum and the tape traveling speed as described above during recording in the EV direction,
As shown in FIG. 8, overwriting of the recording track does not occur at the boundary portion between the FWD recording portion and the REV recording portion on the magnetic tape 40, and therefore the recording signal can be accurately read during reproduction. .

In the above description, an example in which two recording heads each have three gaps has been described, but the number of recording heads and the number of gaps are not limited to these. Further, the reproducing heads have the same configuration and arrangement height as the corresponding recording heads.

Returning to FIG. 1, 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 section 4 to load the magnetic tape. FWD direction or REV
The direction is run at the same speed as during recording, 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 causes the inclination of the fixed upper drum 7 to be the same as during recording, depending on the running direction of the tape. 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 includes the reproducing heads 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.

The reproduced 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.

[0091]

According to the present invention, the rotating drum provided with a plurality of recording heads having a plurality of gaps, and the magnetic tape having the first running direction of the magnetic tape and the second running direction opposite thereto, A recording head having an inclination angle drive means for making the inclination angle of the rotary drum the same with respect to the tape, which scans the magnetic tape first during recording in the first traveling direction, and during recording in the second traveling direction. By switching between the recording head that scans the magnetic tape first, reciprocal recording on the magnetic tape is possible.

[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 showing recording tracks formed in the FWD direction.

FIG. 14 is a diagram for explaining a print head gap and a print pattern in the REV direction.

15 is a diagram showing recording tracks formed when recording in the REV direction is performed by the recording head of FIG.

FIG. 16 is a diagram for explaining a defect when a recording pattern is formed as in FIGS. 12 and 14.

FIG. 17 is a gap of the recording head and RE of the configuration example of the present invention.
FIG. 6 is a diagram for explaining a recording pattern in the V direction.

18 is a diagram showing recording tracks on a magnetic tape when a recording pattern is formed as shown in FIG.

FIG. 19 is a diagram showing a configuration example 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 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. 22 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

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H04N 5/93 H04N 5/93 D

Claims (8)

[Claims] 1. A rotary head device for obliquely scanning a magnetic tape, comprising a rotary drum comprising a plurality of recording heads having a plurality of gaps, a first running direction of the magnetic tape and the first running. A second traveling direction which is the opposite direction to the second traveling direction, and an inclination angle driving means for making the inclination angle of the rotating drum the same with respect to the magnetic tape. And a recording head which first scans on the magnetic tape at the time of recording in the second traveling direction. 2. The plurality of recording heads are provided with the plurality of gaps separated from each other by a distance corresponding to a recording track width of one less than the total number of recording heads. Rotary head device. 3. The relationship between the running speed of the magnetic tape and the number of rotations of the rotating drum is as follows:
When the magnetic tape runs for a distance corresponding to the number of recording tracks corresponding to the total number of gaps of all the recording heads, the height of the pair of magnetic heads arranged on the rotating drum so as to face each other by 180 ° is set. 3. The rotary head device according to claim 2, wherein the height is such that the recording track formed by the preceding magnetic head and the recording track formed by the following magnetic head are adjacent to each other. 4. The rotary drum is provided with a plurality of reproducing heads corresponding to the plurality of recording heads, the reproducing heads having a plurality of gaps arranged at positions separated by a predetermined angle in a direction opposite to the drum rotating direction. The rotary head device according to claim 1, wherein the rotary head device comprises: 5. A rotary drum comprising a plurality of recording heads having a plurality of gaps and a plurality of reproducing heads having a plurality of gaps, and a recording signal for generating a recording signal supplied to the recording heads on the rotating drum. Generating means, reproducing signal generating means for generating a reproducing signal from a signal read from the magnetic tape by the reproducing head on the rotating drum, tape running control means for controlling the running direction and running speed of the magnetic tape, The rotational speed control means for controlling the rotational speed of the rotating drum, and the inclination angle of the rotating drum with respect to the magnetic tape, between the first traveling direction of the magnetic tape and the second traveling direction that is the opposite direction of the first traveling direction. And a recording head which first scans the magnetic tape during recording in the first traveling direction, and a recording direction in the second traveling direction. And a head switching means for switching between a recording head that first scans the magnetic tape and a head. 6. The plurality of recording heads are provided with the plurality of gaps separated from each other by a distance corresponding to a recording track width of one less than the total number of recording heads. Recording and reproducing device. 7. The magnetic tape has a relationship between the running speed of the magnetic tape and the number of rotations of the rotary drum, which is equivalent to the number of recording tracks corresponding to the total number of gaps of all recording heads per one rotation of the rotary drum. In a traveling relationship, the height of the pair of magnetic heads arranged on the rotating drum so as to face each other by 180 ° is the same as that of the recording track formed by the preceding magnetic head and the recording height formed by the following magnetic head. 7. The recording / reproducing apparatus according to claim 6, wherein the height is set so as to be adjacent to the track. 8. A plurality of reproducing heads arranged on the rotary drum are arranged at positions respectively separated by a predetermined angle in a direction opposite to the drum rotating direction, corresponding to the plurality of recording heads. The recording / reproducing apparatus according to claim 5, which is characterized in that.