JPH0744836A - Rotary magnetic head and recording method for magnetic recording pattern - Google Patents

Abstract

PURPOSE:To prevent degradation of a signal caused by editing and to secure interchangeability between devices in multi-channel recording. CONSTITUTION:Four magnetic heads Ha1-Ha4 (Hb1-Hb4) are arranged adjacently on a rotary cylinder 1. The magnetic head is constituted with magnetic heads Ha1 (Hb1), Ha4 (Hb4) having a wide track width and magnetic heads Ha2 (Hb2), Ha3 (Hb3) having a narrow track width, and magnetic heads are arranged so that width of tracks Ta1, Ta4 placed at both ends out of plural tracks recorded by the magnetic heads adjacently arranged is wider than width of tracks Ta2, Ta3 placed at the inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head in a VTR or the like, and more particularly to a multi head in which a plurality of magnetic heads are arranged close to each other.

[0002]

2. Description of the Related Art In recent years, with the progress of magnetic recording technology, development of a high-definition VTR or a digital VTR that handles a lot of information has been advanced. In order to record and reproduce such a large amount of information, multi-channel recording in which a signal is divided into a plurality of channels and recorded and reproduced is effective. In multi-channel recording, for divided signals,
A magnetic head for recording / reproducing the data is required, and the number of magnetic heads increases as the number of channels increases. On the other hand, in a rotary magnetic head typified by a VTR, since a space for mounting the magnetic head is limited, a magnetic head in which a plurality of magnetic heads are arranged close to each other (hereinafter, referred to as a multi-head) is mainstream. ing.

Conventionally, as an example of a technique in such a field, a magnetic recording / reproducing head (actually developed No. 2-42205) in which a protrusion amount of a magnetic head from a rotary cylinder is different in a multi-head configuration is known. .

The structure of the conventional rotary magnetic head and its problems will be described below with reference to FIGS. FIG. 7 is a front view of a conventional rotary magnetic head. FIG. 8 is a diagram showing a magnetic recording pattern of a magnetic tape in a conventional rotary magnetic head. FIG. 9 is a front view showing a cylinder structure of a conventional rotary magnetic head, and FIG. 10 is a plan view thereof. FIG. 11 shows the second part of the magnetic tape in the conventional rotary magnetic head.
3 is a diagram showing a magnetic recording pattern of FIG.

In this example, a rotary magnetic head for recording and reproducing by dividing a video signal and an audio signal into four channels will be described. The head structure is a four-channel multi-head in which four magnetic heads as shown in FIG. 7 are arranged close to each other.

As shown in FIG. 7, a conventional general rotary magnetic head for multi-channel recording is constructed by arranging a plurality of magnetic heads close to each other. Magnetic heads ha1 to ha
4, hb1 to hb4 are fixed to the head base b1, and the erasing heads fe1 and fe2 are fixed to the head base b2. The head bases b1 and b2 are fixed to the rotary cylinder 101. Further, the magnetic heads ha1 to ha
4, hb1 to hb4 (fe1, fe2) are attached at positions where their tips are slightly projected from the outer peripheral surface of the rotary cylinder 101 and at a predetermined height. The track widths g1 to g4 of the magnetic heads ha1 to ha4 and hb1 to hb4 are almost the same.

As shown in FIGS. 9 and 10, the rotary cylinder 101 is attached to a rotary shaft 102, and the rotary shaft 102 is rotatably supported by a fixed cylinder 103.
A head window V for mounting the magnetic head at a predetermined position is provided at the lower end of the rotary cylinder 101. The rotating cylinder 101 is rotationally balanced so that the height of the magnetic head does not change due to vibration during rotation.

The fixed cylinder 103 supports the rotating shaft 102, and a lead 106 for guiding the traveling of the magnetic tape 107 is spirally formed on the outer peripheral surface thereof. Since the lead 106 largely controls the linearity of the running of the magnetic tape 107, it is processed accurately.

Next, the magnetic head arranged in the rotary cylinder 101 will be described. As shown in FIG. 10, the magnetic head attached to the rotary cylinder 101 is a pair of 4-channel multi-heads with 180 ° phase shift, and two pairs, and an erasing head fe1 capable of erasing four tracks recorded by the multi-head simultaneously. , Fe2 are provided 180 degrees out of phase with each other. The 4-channel multi-head and the erasing heads fe1 and fe2 are arranged with their phases shifted by 90 °. The magnetic heads constituting each multi-head are h
a1 (hb1), ha2 (hb2), ha3 (hb
3) and ha4 (hb4).

The magnetic tape 107 is a rotary cylinder 101.
Also, it is obliquely wound around the fixed cylinder 103, and the lower end thereof is regulated by the lead 106. In this example, the magnetic tape 107 is wound in a range of about 190 °, of which 180 ° is the effective winding angle (the range of the angle at which a signal is actually recorded / reproduced).

FIG. 8 is a diagram showing a magnetic recording pattern recorded on the magnetic tape 107 by the rotary magnetic head having the above structure. In order to perform high density recording, the format is such that no recording area (hereinafter referred to as guard band) is provided between the recording tracks. Tracks ta1, ta2, t
a3 and ta4 are magnetic heads ha1, ha2, respectively.
tracks ha3, ha4, tb1, tb2, t
b3 and tb4 are magnetic heads hb1, hb2, respectively.
It is a track recorded by hb3 and hb4. The tracks ta1 to ta4 and tb1 to tb4 are formed with substantially the same width.

The four tracks ta1 to ta4 (t
b1 to tb4), one set of information (for example, one frame of a TV screen).

Here, the track width g1 of the magnetic heads ha1 to ha4 (hb1 to hb4) forming the multi-head.
To g4 and recorded tracks ta1 to ta4
The total widths of (tb1 to tb4) are not the same. This is because the recording tracks ta1 to ta4 (tb1 to t4) are formed so that an extra guard band is not formed between the recording tracks.
The width of the magnetic heads ha1 to ha4 (hb1)
This is because the track widths g1 to g4 in (1 to hb4) are made slightly larger so that a small number of overwritten portions occur between adjacent tracks. The width of the overwritten portion is sufficiently smaller than the width of the recording tracks ta1 to ta4 (tb1 to tb4).

The operation of the rotary magnetic head having the above structure will be described below. As shown in FIG. 10, the magnetic tape 107 travels in the direction of arrow D in the figure, while the rotary cylinder 101 rotates at high speed in the direction of arrow C in the figure. The magnetic tape 107
The traveling is accurately adjusted so that the vehicle travels along the lead 106 formed on the fixed cylinder 103. In this state, the magnetic head ha1 fixed to the rotary cylinder 101
~ Ha4, hb1 to hb4 contact-scan on the magnetic tape 107 to record / reproduce signals.

Since the track width is set as narrow as possible in order to realize high-density recording, the bending of the track recorded by the magnetic head on the magnetic tape 107 by about several μm is a serious problem. The factors that deteriorate the linearity of the track are that the linearity of the leads 106 formed on the fixed cylinder 103 is poor, the regulation force of the magnetic tape 107 in the width direction is not uniform, and the rotating shaft 102 of the rotating cylinder 101 is inclined. There are The bend of the track recorded on the magnetic tape 107 is called the linearity of the track, and the amount thereof is called linearity hereinafter.

The shape of the track bend is between magnetic heads in the same multi-head, for example, magnetic heads ha1 and ha.
2 is relatively similar, but is slightly different between magnetic heads that are 180 ° out of phase, for example between magnetic heads ha1 and hb1. This is physical,
This is because if the time gap is larger, the degree of influence of factors that bend the track changes. In addition, when operating with the same device, even if a serious problem does not occur, since the influence degrees of the above factors are different between different devices, the shape of the track bend may be further different. .

The bending of the track is greatly deteriorated by uncertain factors such as changes in the environment in addition to the above factors. Therefore, the curved shape of the track recorded by the same magnetic head is not always constant.

[0018]

The problems of the conventional rotary magnetic head will be described below.

As shown in FIG. 8, the tracks ta1 to ta are shown.
4 and the tracks tb1 to tb4 have different bends, the track ta4 has a problem that a part x1 of the track is scraped off by the track tb1 recorded later.

When editing is performed, since four tracks ta1 to ta4 (tb1 to tb4) recorded by the multi-head are one set, the erasing head fe1 (fe2) for erasing the tracks has four tracks ta1 to ta4 (tb1 to tb4). Tracks ta1 to ta4
(Tb1 to tb4) can be erased at the same time. In the case of erasing only a part of the already recorded tracks, erasing tb1 to tb4 by the erasing head fe2 causes tracks ta1 and t1 to be erased.
There is a problem that parts x2 and x3 of a4 are scraped off.

As described above, among the tracks recorded by the multi-head, the tracks ta1 on both sides are located.
For the above reason, the ta4 (tb1, tb4) is located inside the tracks ta2, ta3 (tb2, tb3).
Compared with the above, there are many cases where the track is scraped off, and there is a problem that the output cannot be secured sufficiently stably. In particular, when the editing is repeated using the erasing heads fe1 and fe2, there is a big problem.

Further, in the case of repeatedly editing with a device different from the recorded device, if the linearity of the two devices is greatly different, this problem becomes more serious.

As described above, in the conventional rotary magnetic head for multi-channel recording, the magnetic heads ha1 to ha are included.
Since the track widths g1 to g4 of 4 and hb1 to hb4 are the same, the widths of the tracks ta1 and ta4 (tb1 and tb4) on both sides recorded by the multi-head are reduced and a sufficient output cannot be obtained. was there.

The problem of the conventional rotary magnetic head in which the guard band is not provided has been described above. On the other hand, in the conventional rotary magnetic head, there is a method of providing a guard band between each recording track.

FIG. 11 is a diagram showing a second magnetic recording pattern recorded on the magnetic tape 107 by the conventional rotary magnetic head. As shown in FIG. 11, in the method in which the guard band is provided, even if the curved shape of each track is different, a part of the previously recorded track is not scraped off. It's rare to erase extra tracks. However, as is clear from comparison between FIG. 8 and FIG. 11, since a non-recorded portion called a guard band is formed, a large area is required to record information. Therefore, the guard band recording method is a disadvantageous method for high density recording.

The present invention has been made in order to solve the above problems, and it is possible to prevent deterioration of signals due to editing and to ensure compatibility between a plurality of devices. And a magnetic recording pattern.

[0027]

In order to solve the above problems, the present invention arranges three or more magnetic heads close to a rotary cylinder, and the magnetic heads have different track widths for recording on a magnetic medium. Thus, the track width of the magnetic head is set to at least two types of values.

The closely arranged magnetic heads are composed of a first magnetic head having a wide track width and a second magnetic head having a narrow track width. A plurality of magnetic heads recorded by the closely arranged magnetic heads are used. Among the tracks, the magnetic heads are arranged so that the tracks located at both ends are recorded by the first magnetic head and the tracks located inside are recorded by the second magnetic head.

Further, if three or more magnetic heads are arranged close to the rotary cylinder and the number of magnetic heads arranged close to each other is n, then n tracks recorded on the magnetic medium by the n magnetic heads. , One of the tracks located at both ends is set as track 1, and as the distance from track 1 increases, track 2, track 3, ..., Track n
Then, the magnetic head for recording the track 1 follows the magnetic head for recording the track 2 and the track n
The magnetic head is arranged such that the magnetic head for recording the track n follows the magnetic head for recording the track n-1.

A magnetic recording pattern for recording / reproducing information on / from a magnetic medium using a rotary cylinder having three or more magnetic heads, and recording the information by dividing the information into three or more channels. If the number of divisions of is equal to m, the width of tracks located at both ends of the recorded m tracks can be made wider than the width of tracks located inside.

[0031]

According to the present invention, the magnetic heads having different track widths are multi-headed, and the tracks located on both sides of the tracks recorded by the multi-heads are arranged to be recorded by the magnetic head having a wide track width. Even when editing is performed, the track width is not significantly reduced, and sufficient reproduction output can be obtained on all channels.

[0032]

EXAMPLES Examples of the present invention will be described below with reference to FIGS.
Will be described with reference to.

FIG. 1 is a front view of a rotary magnetic head showing a first embodiment of the present invention. FIG. 2 is a diagram showing a magnetic recording pattern of a magnetic tape in the rotary magnetic head according to the first embodiment of the present invention. FIG. 3 is a front view showing a cylinder structure of a rotary magnetic head showing a first embodiment of the present invention, and FIG. 4 is a plan view thereof.

In the first embodiment, a rotary magnetic head for dividing a video signal and an audio signal into four channels for recording and reproducing will be described below. The head structure is a four-channel multi-head in which four magnetic heads are arranged close to each other.

The first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the rotary magnetic head of the first embodiment of the present invention for performing multi-channel recording is configured by arranging a plurality of magnetic heads close to each other. The magnetic heads Ha1 to Ha4 and Hb1 to Hb4 are fixed to the head base B1, and the erasing heads FE1 and FE2 are fixed to the head base B2. The head bases B1 and B2 are fixed in phase with the head window W provided in the lower portion of the rotary cylinder 1.

The magnetic head has a rotary cylinder 1 at its tip.
It is attached at a position that slightly protrudes from the outer peripheral surface of the and is adjusted to a predetermined height. These magnetic heads Ha1 to Ha
The track widths G1 to G4 of 4 and (Hb1 to Hb4) are not the same, and the magnetic heads Ha1 and Ha4 at both ends are located.
The track widths G1 and G4 of (Hb1, Hb4) are the magnetic heads Ha2, Ha3, (Hb2, Hb) located inside.
It is set wider than the track widths G2 and G3 in 3).

As shown in FIGS. 3 and 4, the rotary cylinder 1 is attached to a rotary shaft 2, and the rotary shaft 2 is rotatably supported by a fixed cylinder 3. At the lower end of the rotary cylinder 1, a rectangular notch called a head window W for mounting the magnetic head at a predetermined position is provided. The rotating cylinder 1 is rotationally balanced so that vibration does not occur during rotation and the height of the magnetic head does not change.

The fixed cylinder 3 supports the rotating shaft 2 and has leads 6 spirally formed on its outer peripheral surface for guiding the running of the magnetic tape 7. Lead 6
Since the running linearity of the magnetic tape 7 is largely controlled, it is processed with high accuracy.

Next, the magnetic head arranged in the rotary cylinder 1 will be described. As shown in FIG. 4, the magnetic head mounted on the rotary cylinder 1 is a pair of 4-channel multi-heads which are 180 degrees out of phase with each other, and an erasing head FE1 capable of simultaneously erasing four tracks recorded by the multi-head. The FE2 is provided 180 degrees out of phase. 4-channel multi head and erasing head FE
1 and FE2 are arranged with their phases shifted by 90 °.

The erasing head FE1 is composed of the magnetic heads Ha1 to Ha1.
The tracks Ta1 to Ta4 recorded by Ha4 are erased, and the erasing head FE2 is adjusted to a predetermined height so that the tracks Tb1 to Tb4 recorded by the magnetic heads Hb1 to Hb4 can be erased.

The magnetic heads constituting each multi-head are
From the side that enters the magnetic tape 7 in advance, Ha1 (Hb
1), Ha2 (Hb2), Ha3 (Hb3), Ha4
(Hb4).

The magnetic tape 7 is wound obliquely around the rotary cylinder 1 and the fixed cylinder 3, and the lower end of the magnetic tape 7 is regulated by the lead 6. In this example,
The magnetic tape 7 is wound in the range of about 190 °,
Of these, 180 ° is the effective winding angle.

FIG. 2 is a diagram showing a magnetic recording pattern recorded on a magnetic tape by the rotary magnetic head of the present invention. The rotary magnetic head of the present invention has a format in which a guard band is not provided between recording tracks in order to realize higher density recording. Tracks Ta1, Ta2, Ta
3 and Ta4 are magnetic heads Ha1, Ha2 and H, respectively.
tracks Tb1, Tb2, Tb by a3, Ha4
3 and Tb4 are magnetic heads Hb1, Hb2 and H, respectively.
It is a track recorded by b3 and Hb4.

As shown in FIG. 2, the widths of the tracks are not the same. Of the four tracks recorded by the multi-head, the tracks Ta1 (Tb1) and Ta4 (Tb4) are wider than the tracks Ta2 (Tb2) and Ta3 (Tb3). In addition, four tracks Ta1 to T
a4 (Tb1 to Tb4) is one set of information (for example, one frame of a TV screen).

Here, the total of the track widths G1 to G4 of the magnetic heads forming the multi-head and the total of the widths of the recorded tracks Ta1 to Ta4 (Tb1 to Tb4) are not the same. This is because the recording tracks Ta1 to Ta are formed so that an extra guard band is not formed between the recording tracks.
4, (Tb1 to Tb4) width, the magnetic head Ha1
To Ha4, (Hb1 to Hb4) track widths G1 to G4
This is because a little is made large so that a little overwritten portion occurs between adjacent tracks. Since the width of the overwritten portion is sufficiently smaller than the width of the track to be recorded, the track Ta1 is overwritten by overwriting.
Does not become smaller than the width of the track Ta2.

The operation of the rotary magnetic head of the present embodiment constructed as above will be described below.

As shown in FIG. 4, the magnetic tape 7 runs in the direction of the arrow D in the figure, while the rotary cylinder 1 is
It rotates at high speed in the direction indicated by arrow C in the figure. Magnetic tape 7
Accurately adjusts the traveling so that the vehicle travels along the lead 6 formed on the fixed cylinder 3. In this state, the magnetic head fixed to the rotary cylinder 1 makes contact scanning on the magnetic tape 7 to record / reproduce signals. The track recorded on the magnetic tape 7 in this manner is formed in a substantially linear shape.

However, it is usually recorded due to factors such as the linearity of the leads 6 formed on the fixed cylinder 3, the nonuniformity of the regulation force of the magnetic tape 7 in the width direction, and the inclination of the rotary shaft 2 of the rotary cylinder 1. The track is bent by several μm. The bend of the track is adjusted to be as small as possible, but in reality, there is a certain limit, and it is almost impossible to improve the linearity further.

As shown in FIG. 2, the tracks Ta1 to Ta are provided.
4 and the tracks Tb1 to Tb4 have different curved shapes, the track Ta4 has a problem that a part X1 of the track is scraped off by the track Tb1 recorded later.

When editing is performed, four tracks Ta1 to Ta4 (Tb1 to Tb) recorded by the multi-head are recorded.
Since 4) is one set, the erasing head FE1 (FE2) for erasing the same has four tracks Ta1 to T1.
a4 (Tb1 to Tb4) can be erased at the same time. As described above, in the case of erasing only a part of the already-recorded tracks, when Tb1 to Tb4 are erased by the erase head FE2, there is a problem that parts X2 and X3 of the tracks Ta1 and Ta4 are scraped off.

In contrast, the rotary magnetic head of the present invention has tracks Ta1 and Ta4 (Tb1,
The width of the inner track Ta2, Ta3 (Tb4)
Since the magnetic head is configured to be wider than the width of (2, Tb3), the tracks Ta1, Ta4 (Tb
1, Tb4), even if a part of the track is scraped off for the above reason, the inner tracks Ta2, Ta3 (Tb
2, Tb3) can be ensured.

Therefore, there is no problem that the output is reduced even when the editing is repeated using the erasing heads FE1 and FE2, and it is possible to deal with the case where the curve of the track is changed due to a change in the environment. Further, the compatibility between two devices having different track bending shapes becomes more reliable.

Moreover, the following can be said when the viewpoint is changed. The conventional multi-head has a wider track width with a slight margin on the assumption that the track widths at both ends will be scraped off, and the inner track width is the same width, so the track width as a whole Was widened by a margin. On the other hand, in the rotary magnetic head of the present invention, the tracks Ta1 and Ta4 at both ends are
Only (Tb1, Tb4) is widened and the inner track Ta is
Since the width of 2, Ta3 (Tb2, Tb3) eliminates unnecessary margin, it is possible to reduce the track width as a whole of the multi-head and realize a format with high recording density.

As described above, according to the first embodiment of the present invention, in a multi-head structure for performing multi-channel recording, deterioration of signals due to editing is prevented and compatibility between a plurality of devices is further ensured. Can be

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a front view of a rotary magnetic head showing a second embodiment of the present invention, and FIG. 6 is a second view of the present invention.
FIG. 6 is a diagram showing a magnetic recording pattern of a magnetic tape in the rotary magnetic head showing the example of FIG.

In the following, also in the second embodiment, a rotary magnetic head for dividing a video signal and an audio signal into four channels for recording and reproduction will be described. The head structure is a four-channel multi-head in which four magnetic heads are arranged close to each other.

As shown in FIG. 5, the rotary magnetic head of the second embodiment of the present invention for performing multi-channel recording comprises a plurality of magnetic heads arranged close to each other. The magnetic head is fixed to the head base BB, and the head base BB is fixed to the rotary cylinder 21. The magnetic heads that compose the multi-head are J
1, J2, J3 and J4.

The height of the magnetic head is as shown in FIG.
The magnetic head J2 is set higher than the magnetic head J1, and the magnetic head J3 is set higher than the magnetic head J4. The track widths g1 to g4 of these magnetic heads are almost the same.

The rotary cylinder 21 and other components are the same as those in the first embodiment and will not be described.

FIG. 6 is a diagram showing a magnetic recording pattern recorded on a magnetic tape by the rotary magnetic head according to the second embodiment of the present invention. The rotary magnetic head of the present invention has a format in which a guard band is not provided between recording tracks in order to realize higher density recording. As shown in FIG. 5, since the multi-head magnetic head is set to the above-described height, the track T1 is recorded by the magnetic head J2, the track T2 is the magnetic head J1, and the track T3 is the magnetic head. The track T4 is recorded by the magnetic head J4 at J3.

Here, the total of the track widths g1 to g4 of the magnetic heads constituting the multi-head and the total of the widths of the recorded tracks T1 to T4 are not the same. This is because the track widths g1 to g4 of the magnetic head are set slightly larger than the width of the recording tracks so that an extra guard band is not formed between the recording tracks, and a small amount of overwriting is performed between adjacent tracks. This is because some parts are generated.

On the other hand, in the conventional rotary magnetic head,
The magnetic head J1 records the track T1, and the magnetic head J1
2 was configured to record track T2. Since the magnetic head J2 follows (records later) than the magnetic head J1, there is a problem in that the track T1 is always scraped off by the track T2.

Next, the bending of the track will be described. The curved shape of the tracks is the tracks T1 to T4 recorded by the magnetic heads J1 to J4 in the same multi-head.
Are relatively similar. This is because the magnetic heads J1 to J4 forming the multi-head are arranged close to each other. However, the track T1 ′ recorded by another head (including the erasing head after one revolution of the same multi-head)
T4 '(head scanning locus in case of erasing head) is
The shape of the track bend is slightly different. This is because the physical and temporal gaps are large, and the factors that bend the track differ accordingly.

For this reason, the track T4 is more likely to be scraped off than the other tracks T1 to T3, and the amount thereof is also large. Further, when editing is performed, since four tracks T1 to T4 are erased at the same time, a part of the adjacent tracks T1 and T4 is scraped off.

As described above, in the conventional rotary magnetic head,
The tracks T1 and T4 have a problem that they have more opportunities to be scraped off than the tracks T2 and T3.

Therefore, the rotary magnetic head of the present invention is shown in FIG.
As shown in FIG. 7, the magnetic head J2 is configured to record after the magnetic head J1. Therefore, there is no problem that the end of the track T1 is scraped off by the magnetic head J1. Strictly speaking, the shapes of the tracks T1 and T2 are different from each other, and there is no problem that a part of the track T1 is scraped off due to the difference in the curves.

Similarly, with respect to the tracks T3 and T4, there is no problem that the track T4 is scraped off by the track T3.

As a result, it is possible to reduce the reduction in the track width of the tracks T1 and T4, which are frequently scraped off.

As described above, according to the second embodiment of the present invention, in a high density VTR having a small track width,
It is possible to prevent signal deterioration due to editing and to ensure compatibility between a plurality of devices.

As described above, according to the first and second embodiments of the present invention, even when repetitive editing is performed, the track width is not significantly reduced, and sufficient reproduction output can be obtained for all channels. Therefore, compatibility between a plurality of devices can be further ensured. Further, as is clear from comparison between FIG. 2 and FIG. 11, according to the embodiment of the present invention, since it is not necessary to provide a guard band, a tape format having a higher recording density can be realized.

In the present embodiment, the 4-channel multi-head which records and reproduces information by dividing it into four channels has been described. However, the number of divided channels and the number of magnetic heads constituting the multi-head are independent. Also, the number is not limited.

Further, the multi-head structure in which the magnetic heads are arranged close to each other has been described as an example. However, even if the multi-head structure is not used, it is a magnetic recording pattern for recording a signal by dividing it into three or more channels, If the number of channel divisions is m, the width of the tracks located at both ends of the recorded tracks may be wider than the width of the tracks located inside the magnetic recording pattern.

It is also conceivable to perform signal division according to the function and record the video signal with a magnetic head having a wide track width and the audio signal with a magnetic head having a narrow track width.

[0074]

As described above, according to the rotary magnetic head of the present invention, among the plurality of tracks recorded by the multi-head, the width of the tracks located at both ends is wider than the width of the tracks located inside. By arranging the heads as described above, it is possible to prevent deterioration of signals due to editing and to ensure compatibility between a plurality of devices.

In addition, the above-mentioned effect is obtained particularly in the tape format without the guard band, and in this case, the recording density can be further improved.

[Brief description of drawings]

FIG. 1 is a front view of a rotary magnetic head showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a magnetic recording pattern of a magnetic tape in the rotary magnetic head showing the first embodiment of the invention.

FIG. 3 is a front view showing a cylinder configuration of the rotary magnetic head showing the first embodiment of the invention.

FIG. 4 is a plan view showing a cylinder configuration of a rotary magnetic head showing a first embodiment of the invention.

FIG. 5 is a front view of a rotary magnetic head showing a second embodiment of the present invention.

FIG. 6 is a diagram showing a magnetic recording pattern of a magnetic tape in a rotary magnetic head showing a second embodiment of the invention.

FIG. 7 is a front view of a conventional rotary magnetic head.

FIG. 8 is a diagram showing a magnetic recording pattern of a magnetic tape in a conventional rotary magnetic head.

FIG. 9 is a front view showing a cylinder configuration of a conventional rotary magnetic head.

FIG. 10 is a plan view showing a cylinder configuration of a conventional rotary magnetic head.

FIG. 11 is a diagram showing a second magnetic recording pattern of a magnetic tape in a conventional rotary magnetic head.

[Explanation of symbols]

 1 rotary cylinder 2 rotary shaft 3 fixed cylinder 7 magnetic tape Ha1 to Ha4, Hb1 to Hb4 magnetic head FE1, FE2 erasing head

Claims (4)

[Claims] 1. A head width of the magnetic head is at least 2 so that three or more magnetic heads are arranged close to a rotary cylinder and the widths of tracks recorded on a magnetic recording medium by the magnetic heads are different. A rotary magnetic head characterized in that the value is equal to or greater than the types. 2. The closely arranged magnetic heads are composed of a first magnetic head having a wide head width and a second magnetic head having a narrow head width, and the magnetic heads arranged close to each other. Of the plurality of recorded tracks, the magnetic head is arranged so that the tracks located at both ends are recorded by the first magnetic head and the tracks located inside are recorded by the second magnetic head. The rotary magnetic head according to claim 1, wherein the magnetic head is arranged. 3. When three or more magnetic heads are arranged close to a rotating cylinder and the number of magnetic heads arranged close to each other is n, a magnetic recording medium is composed of n magnetic heads. Of the n tracks to be recorded, one of the tracks located at both ends is set as track 1, and the track 1
Away from track 2, track 3, ...
············································································································· A rotary magnetic head characterized in that a magnetic head is arranged so as to follow. 4. Recording of a magnetic recording pattern for recording / reproducing information on / from a magnetic recording medium using a rotary cylinder having three or more magnetic heads, and recording the information by dividing the information into three or more channels. In the method, when the number of divisions of the channel is m, the width of tracks located at both ends of the recorded m tracks is wider than the width of tracks located inside. A magnetic recording pattern recording method characterized by recording a magnetic recording pattern thereon.