JPH01229418A - Rotary head for magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To improve the attachment accuracy of a magnetic head to a rotary drum by specifying the distance between gaps of two magnetic heads as well as the error of the height position of said gap. CONSTITUTION:The distance between gaps 5 and 5 of two magnetic heads 2a and 2b is set at the value approximately equal to an odd multiple of the folding value between the adjacent tracks on a tape. At the same time, the shift of the height position said gaps 5 and 5 is set at the value approximately equal to an odd multiple of the track pitch P. Thus it is possible to set the paired heads 2a and 2b extremely close to each other on a rotary drum 1 and therefore to fix both heads on the same head base or to form these heads in a single body. As a result, the magnetic heads can be easily attached to a rotary drum with high accuracy.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to R-D AT [rotary head
digital audio tape record
The present invention relates to a rotary head used in a magnetic recording/reproducing device using an oblique scanning method, such as a magnetic recording/reproducing device using an oblique scanning method.

[Conventional technology]

R-DAT and home VTR [video tape
re-corder], two magnetic heads are combined into one
The magnetic tape is attached to a rotating drum at 800-degree intervals, and recording is performed on the magnetic tape using a diagonal scanning method while alternating between these.

FIG. 7 shows an outline of the tape formant of R-DAT.

The specifications of this R-DAT in standard mode are as follows.

Tape width A: 3.81 mm Tape speed v: 8.15 mm 1/s Rotating drum diameter: 3011 m Rotating drum rotation speed N:
2000 rpm Relative speed VH of magnetic head: 3. 1
33 m/s Stationary trunk angle: Approximately 6 degrees 22' Track length L: 23.501 mm Track pitch P: 13.591 mm Here, each trunk is equally divided into 196 blocks. Therefore, the block length B per block is approximately 0.
．． 120mm ('; 23.501÷196). Further, the amount of bend α8, which is the distance of deviation along the longitudinal direction between adjacent tracks, is determined from the rotation speed N of the rotating drum, the tape speed 7, the diameter of the rotating drum, and the stationary track angle, and is approximately 0.1215 m. becomes. Therefore, the bending amount α8 and the block length B almost match.

Next, a conventional R-DAT recording method for satisfying the above specifications will be described with reference to FIGS. 8 to 11.

As shown in FIG. 8, the rotating drum 11 rotates at a rotation speed N. Two magnetic heads 1 are mounted on this rotating drum 11.
2a and 12b are attached at the same height at 180° intervals. Further, the tape 13 is wound around the rotating drum 11 by an angle of 906, and runs in the forward direction of rotation of the rotating drum 11 at a tape speed of 1. At this time, the rotary drum 11 is disposed obliquely to the slave 13 by the angle of the stationary track. Therefore, each magnetic head 12a.
12b will scan diagonally over this slave 13 at a relative speed of 8.

The magnetic heads 12a and 12b are made by bonding two pieces of magnetic material 14 and 14, respectively, as shown in FIGS. 9 and 10. And these two magnetic pieces 1
A gap 15 is formed at the junction between the parts 4 and 14. Further, glass 16 made of non-magnetic material is provided at the upper and lower portions of the gap 15 so that a predetermined gap width is formed.
16 is filled. Furthermore, this magnetic head 12a
・Each gap 15 of 12b has a different ±
An azimuth angle of 20° is provided.

Therefore, as shown in FIG. 11, on the tape 13,
Trucks T1, T2, T3... based on the above specifications
are formed sequentially. And the odd-numbered track T,
T3... are recorded by the magnetic head 12a, and even-numbered trunks T2, T4... are recorded by the magnetic head 12b.
will be recorded alternately. Furthermore, there is a difference in azimuth angle of ±20° between adjacent tracks T. Each track T recorded in this way is recorded by each magnetic head 1 having the same azimuth angle.
2a and 12b are alternately reproduced.

[Problem to be solved by the invention]

However, in such a conventional R-DAT, two magnetic heads 12 are installed on the rotating drum 11 in order to form each track T1, T2, T3, and perform a series of recordings.
It was necessary to provide a and 12b at 180° intervals. Attachment of the magnetic heads 12a and 12b requires extremely high precision. For example, the track pitch P of R-DAT is 13.591- as described above. On the other hand, VH3 type VTRs have 58
-, and even in the 3x mode it is 19-. From this, it can be seen that the height positions of the magnetic heads 12a and 12b on the rotating drum 11 in the R-DAT must be mounted with higher precision than in the VH3 system VTR, which inherently requires high precision.

Therefore, the conventional R-DAT rotary head requires extremely high precision in attaching the magnetic head to the rotary drum, which poses a problem in that it impedes productivity improvement.

In addition, this problem is solved by using the diagonal scanning method to form diagonal tracks alternately on the tape to make a series of recordings, and in order to alternately reproduce this series of recordings, two tracks are placed on a rotating drum. This is common to magnetic recording and reproducing apparatuses in which magnetic heads of 180' are attached at intervals of 180'.

[Means to solve the problem]

In order to solve the above problems, the rotary head of the magnetic recording and reproducing apparatus according to the present invention is designed to perform a series of recordings by alternately forming a large number of diagonal tracks on a tape using a diagonal scanning method, and/or In order to scan this track alternately and reproduce a series of recordings, in a rotating head of a magnetic recording/reproducing device in which a set of two magnetic heads are attached to a rotating drum, the gap between the two magnetic heads is The distance is set to be approximately equal to an odd multiple of the bend amount between adjacent tracks on the tape, and the height position deviation between the gaps of these magnetic heads is the track bias.

It is characterized in that it is set approximately equal to the same odd number multiple of the above.

[For production]

In the diagonal scanning method, a large number of diagonal tracks are continuously formed in parallel on the tape. These trucks are
Each consecutively constitutes a series of records. Examples of magnetic recording/reproducing apparatuses that alternately scan these trunks with two magnetic heads on a rotating drum include R-DATs and home VTRs. Note that this magnetic recording and reproducing device may be used not only for recording and reproducing, but also for recording only or reproducing only.

The distance between the gear knobs of the two magnetic heads is set approximately equal to an odd multiple of the amount of bending between adjacent tracks on the tape. The distance between the gaps is a distance along the rotation direction on the circumferential surface of the rotating drum. Normally, these two magnetic heads have different azimuth angles set for each gap, but for example, the average distance may be set approximately equal to an odd multiple of the amount of bending. In addition, the amount of folding is
It is the longitudinal offset distance between adjacent tracks in a tape format. If this track has an override portion, this is the distance of deviation from the recording start portion of the original signal. In the case of R-DAT, the seventh
As explained based on the figure, since this amount of break α□ and the block length B almost match, it is sufficient to set the distance to an odd number multiple of one block. The reason for making the distance between the gaps an odd number multiple of this bending amount is that when one magnetic head scans a certain track, the other magnetic head always scans the first (adjacent trunk), third, or fifth track from this track.
This is because odd-numbered tracks will be scanned. In practice, an odd number multiple of this amount of bending is 1
It is set up to about twice or three times. Therefore, the actual gap distance usually does not reach 11 m.

Further, the height positional deviation between the gaps between the two magnetic heads is set to be approximately equal to an odd number times the length of the tape formant. The height difference between the gaps is a step on the circumferential surface of the rotating drum in the direction along the rotation axis. Further, this odd number multiple needs to be the same as the odd number multiple of the bending amount. Incidentally, in a conventional rotary head in which two magnetic heads are attached at an interval of 180 degrees, there is no deviation in the height position between the gaps of these magnetic heads.

A tape is wound around the rotary head to which the two magnetic heads are attached in the same manner as in the prior art.

However, during recording, recording signals for two tracks are simultaneously sent to these magnetic heads. For this reason, when ordered signals such as audio signals and video signals are sent one after another, compared to a conventional rotating head in which magnetic heads are installed at 1806 intervals, the signal sent to the previous magnetic head is approximately It is necessary to delay the time by an odd number of half revolutions in the rotating drum. If the magnetic recording/reproducing device records digital signals, this delay can be created using a memory element or the like.

Furthermore, if the magnetic recording/reproducing device records analog signals, a delay element or the like may be used. However, when recording digital information without order, it is not necessarily necessary to create such a delay time.

Also, during playback, two magnetic heads are used.
Tracks of signals are played simultaneously.

The signal processing in this case may be performed in the opposite manner to that in the case of recording.

As described above, the pair of magnetic heads of the present invention can perform recording in the same tape format as conventional tape formats, and can perform playback from there. Since these magnetic heads can be placed close to each other, they can be fixed on the same head base when forming the magnetic core, and both magnetic cores can be formed integrally. can.

Note that in order to perform different series of recordings on the same tape or to perform recording in different modes, 2 (I) of the present invention is required.
Of course, a plurality of liI-sets of magnetic heads or a set of conventional two-piece magnetic heads can be mounted on the rotating drum.

[Embodiment 1] The first embodiment of the present invention will be described as follows based on FIGS. 1 to 3.

This embodiment shows a case in which an "odd multiple" in the positional relationship between two magnetic heads is set to 1 in a rotary head of an R-DAT. The tape format of R-DAT is as described above in No. 70.

As shown in FIG. 1, the rotary drum 1 is driven to rotate at a rotational speed N by a rotary head drive device (not shown). Two magnetic heads 2a and 2b are attached adjacently to the rotating drum 1 to form a rotating head. Also, the tape 3 is placed on this rotating drum 1 at 9
The tape is wound by an angle of 0°, and is run in the forward direction of the rotation of the rotary drum 1 at a tape speed of {circumflex over (2)} by a tape feeding device (not shown). At this time, the rotary drum 1 is arranged obliquely to the child drum 3 by the stationary track angle. Therefore, each of the magnetic heads 2a and 2b moves on this child disk 3 at a relative speed of {circumflex over (2)}. This will scan diagonally.

The magnetic heads 2a and 2b are arranged close to each other, as shown in FIG. 2(a). The magnetic core of one magnetic head 2a is formed by pasting together two pieces of magnetic material 4. A gap 5 is formed at the joint between the magnetic pieces 4 . Further, in the upper and lower parts of this gap 5, the magnetic pieces 4 are cut out so that a predetermined gap width is formed, and these parts are filled with glass 6 made of a non-magnetic material. By winding a winding (not shown) around this magnetic core, the magnetic head 2a
is configured. The other magnetic head 2b also has the same configuration as this magnetic head 2a.

However, each gap 5, 5 of this magnetic head 2a, 2b
are provided with different azimuth angles of ±20°. The magnetic nozzles 2a and 2b are arranged so that the distance between the gaps 5 and 5 on the rotating drum 1 corresponds to the block length B of one block. This block length B is about 0.120 m, which almost matches the fold amount α□ on the tape format. Therefore, the opposing magnetic pieces 4, 4 in each of the magnetic heads 2a, 2b are made of extremely thin magnetic pieces so that they do not overlap. Further, in the magnetic heads 2a and 2b, a height position between each gap 5 on the rotary drum 1 is provided with a deviation that matches the trunk pitch P on the tape format. This trunk pitch P is 13.591-. For these reasons, the positional relationship between the gaps 5 requires extremely high accuracy. However, this precision can be easily achieved by fixing each magnetic core of the magnetic heads 2a and 2b on the same helad base during the manufacturing process of the magnetic head.

FIG. 2(b) shows another embodiment of the magnetic heads 2a and 2b. In this case, the magnetic heads 2a and 2b have opposing magnetic pieces 4 and 4 joined together through a glass 6. It is integrated. As in the case of FIG. 2(a), the distances and heights between the gaps 5 and 5 are made to match the block length B and the trunk pitch P, respectively. Therefore, the accuracy of the positional relationship between the gaps 5 can also be easily achieved in the magnetic head manufacturing process.

Therefore, the two magnetic heads 2a and 2b can be attached to the rotary drum 1 with the positional relationship set in advance with high accuracy, which facilitates assembly.

When recording is performed on the tape 3 using the rotary head configured as described above, as shown in FIG. 3, the trunks T, -T2, T3, and
... are formed sequentially. At this time, during the first quarter rotation of the rotating drum 1, the magnetic head 2a records the trunk T, and at the same time, the magnetic head 2b records the trunk T2. Then, at one-quarter rotation after further three-quarter rotation, the magnetic head 2a records track T3, and at the same time, the magnetic head 2b records track T4. Thereafter, two tracks are simultaneously recorded for each revolution of the rotary drum 1. Also, in the case of playback, the 2nd
Tracks are played simultaneously. In this case, although no guard band is formed between each track TT, the azimuth angles are different, so the influence of crosstalk can be eliminated.

In this way, in the R-DAT of this embodiment, two tracks are simultaneously recorded by the two magnetic heads 2a and 2b.

Therefore, the audio signal sent for recording is
It is necessary to temporarily wait for a track's worth of signals and send them to the rotary head at the same time as the next track's worth of signals.

However, since R-DAT converts audio signals into digital signals and records them, such processing can be easily performed using a memory element or the like. Also, in the case of reproduction, by performing the reverse process, the original continuous audio signal can be obtained.

Incidentally, since the R-DAT of this embodiment performs recording based on the R-DAT tape format, it is of course possible to reproduce the tape 3 recorded thereby with the conventional R-DAT. Furthermore, it goes without saying that the tape 3 recorded with the conventional R-DAT can be played back with the R-DAT of this embodiment.

[Embodiment 2] A second embodiment of the present invention will be described based on FIGS. 4 to 6.

This embodiment shows a case in which the "odd number multiple" in the positional relationship between two magnetic heads is tripled in a rotary head of an R-DAT. Components having the same functions as those in the first embodiment are denoted by the same reference numerals, and their explanations will be omitted.

As shown in FIG. 4, the rotating drum 1 rotates at the number of rotations N, and the tape 3 is wound around the rotating drum 1 and travels in the forward direction of rotation of the rotating drum 1 at a tape speed of A. , is the same as in the first embodiment. Furthermore, magnetic nozzles 2a and 2b configured similarly to the first embodiment are also attached adjacent to the rotating drum 1.

However, as shown in FIG.
a and 2b are respective gaps 5 and 5 on the rotating drum 1
They are arranged so that the distance between them corresponds to three times the block length B of 1-pro and 7-ri. Correspondingly, a shift corresponding to three times the length of the tiger/nokubifuchi P is provided in the height position between each gap 5. This positional relationship between the gaps 5 can be easily achieved with high precision by fixing each magnetic core on the same hendo base during the manufacturing process of the magnetic head. Therefore, the two magnetic heads 2a and 2b can be attached to the rotary drum 1 with the positional relationship set in advance with high accuracy, which facilitates the assembly work.

When recording is performed on the tape 3 using the rotary head configured as described above, as shown in FIG.
... is formed. At this time, the first four
At the same time as the magnetic head 2a records the track T in one-quarter rotation, the magnetic head 2b records the third track T4. Then, at one-quarter rotation after further three-quarter rotation, the magnetic head 2a records track T3, and at the same time, the magnetic head 2b records the third track T6. Thereafter, two tracks separated by three tracks are simultaneously recorded for each revolution of the rotary drum 1. In the case of reproduction, two tracks separated by three tracks are similarly reproduced simultaneously in this order. Note that in such recording and reproduction, scanning of track T2 will be missing. However, since such omission is only for one track at the beginning of recording and reproduction, it has almost no effect. Furthermore, in order to eliminate such omissions, the trunk T2 may be scanned in advance by only the magnetic head 2b during the first revolution of the rotary drum 1.

In this way, in the R-DAT of this embodiment as well, two tracks are simultaneously recorded by the two magnetic heads 2a and 2b. For the audio signals sent for recording, the signals for the previous 3 tracks and 7 tracks are temporarily put on standby, and then the signals for the first track are sent to the rotating head at the same time as the signals for the next 1 track. It is necessary to send it to Therefore, the memory element etc. for performing such processing is
This requires a larger capacity than the example. however,
In this embodiment, the gap 5; 5 between the magnetic heads 2a and 2b is
The distance between them can be approximately 0.360 m, which is three times the block length B. When the distance between the gaps 5 and 5 is widened in this way, it is possible to increase the size of the opposing magnetic pieces 4 and 4, which has the advantage that manufacturing of the respective magnetic heads 2a and 2b becomes easier. For playback, the reverse process is performed to obtain the original continuous audio signal.

Note that since the R-DAT of this embodiment is also based on the tape format of R-DAT, it is similar to the first embodiment in that it is compatible with the conventional R-DAT.

〔Effect of the invention〕

As described above, the rotary head of the magnetic recording and reproducing apparatus according to the present invention is used to perform a series of recordings by alternately forming a large number of diagonal tracks on a tape by the diagonal scanning method, and/or to perform a series of recordings on the tape by the diagonal scanning method. In order to reproduce a series of recordings by alternately scanning, a rotating head of a magnetic recording/reproducing device has a set of two magnetic heads attached to a rotating drum.
The distance between the gaps of these magnetic heads is set to be approximately equal to an odd multiple of the amount of bending between adjacent tracks on the tape, and the height position deviation between the gaps of these magnetic heads is set to be equal to the above-mentioned track pitch. The configuration is set almost equally to the same odd number multiple.

This makes it possible to arrange two sets of magnetic heads on the rotating drum extremely close to each other, although it is possible to perform recording and reproduction in the same tape format as in the past.

Therefore, since the rotating nozzle of the present invention allows these two magnetic heads to be fixed on the same Radbase or formed integrally, it is easy to attach them to the rotating drum, and High mounting has the effect that precision can be obtained.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a plan view showing the arrangement of a magnetic head on a rotating drum, and FIG. 2(b) is a directional view of the magnetic head at arrow H, FIG. 2(b) is a directional view of another embodiment of the magnetic head at arrow ■ in FIG. 1, and FIG. It is a front view. Fourth
6 to 6 show a second embodiment of the present invention, FIG. 4 is a plan view showing the arrangement of the magnetic head on the rotating drum, and FIG. 5 is the magnetic head indicated by the arrow ■ in FIG. FIG. 6 is a partial front view showing the track pattern on the tape. FIG. 7 shows the tape format of R-DAT, FIGS. 8 to 11 show conventional examples, FIG. 8 is a plan view showing the arrangement of the magnetic head on the rotating drum, and FIG. The figure is a view of the magnetic head at arrow ■ in Figure 8, Figure 10 is a view of the magnetic head at arrow X in Figure 1, and Figure 11 is a partial front view showing the trunk pattern on the tape. It is a diagram. 1 is a rotating drum, 2a and 2b are magnetic heads, 3 is a tape, 5 is a gap, α8 is a fold amount, B is a block length, and P is a track pitch. Patent applicant Sharp Corporation Figure 1 Figure 2 (a) Figure 2 (b)

Claims (1)

[Claims] 1. To perform a series of recordings by alternately forming a large number of diagonal tracks on a tape using a diagonal scanning method, and/
Alternatively, in a rotating head of a magnetic recording/reproducing device in which a set of two magnetic heads are attached to a rotating drum in order to alternately scan this track and reproduce a series of recordings, the gap between the two magnetic heads is The distance is set approximately equal to an odd multiple of the fold amount between each adjacent track on the tape,
A rotary head for a magnetic recording and reproducing device, characterized in that the height positional deviation between the gaps of these magnetic heads is set to be approximately equal to the same odd number multiple of the track pitch.