JP3116745B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus having a plurality of heads.

[0002]

2. Description of the Related Art In recent years, recording / reproducing apparatuses utilizing magnetic recording have been widely used for VTRs and the like. Short-wavelength recording, narrowing of tracks, and thinning of magnetic tape are progressing. Under such circumstances, one of the mechanical problems is to ensure the width accuracy of the recorded track and to accurately trace the magnetic head.

Conventionally, this type of device has the following structure. FIG. 7 is an arrangement diagram of a magnetic head of a magnetic recording / reproducing apparatus showing a conventional example described in Japanese Patent Publication No. Hei 2-13368. In FIG. 7, reference numeral 4 denotes a first magnetic head, 3 denotes a second magnetic head, 2 denotes a third magnetic head, 32 denotes a fourth magnetic head, and 41 denotes a first magnetic head from the lower end reference of the first magnetic head 4. 2 is the height mounting dimension of the lower end of the magnetic head 3, 40 is the height mounting dimension of the lower end of the third magnetic head 2 from the lower end of the second magnetic head 3, and 39 is the height mounting dimension of the lower end of the third magnetic head 2. The height of the lower end of the fourth magnetic head 32 is 38 mm.
, Vt is the running direction of the magnetic tape (not shown), Vh
Indicates the scanning direction of the magnetic head.

The arrangement of each magnetic head is mounted as follows. (1) The second magnetic head 3 is attached with reference to the lower end 8 of the first magnetic head 4.
(2) The third magnetic head 2 is attached with reference to the lower end 7 of the second magnetic head 3. (3) The third magnetic head 2
The fourth magnetic head 32 is mounted on the basis of the lower end 44 of the fourth magnetic head. Generally, the mounting always includes an error. Therefore, the mounting error is set to ± Δh, and the mounting dimensions 41, 40, and 39 are each set to ± Δh.
The second magnetic head 3 is ± Δh with respect to the first magnetic head 4, the third magnetic head 2 is ± 2Δh with respect to the first magnetic head 4, and the fourth magnetic head 32 Includes a maximum error of ± 3Δh with respect to the first magnetic head 4.

FIG. 8 is a schematic diagram of recording tracks in the magnetic head arrangement of FIG. In FIG. 8, reference numeral 22 denotes a fifth magnetic head of a second pair of magnetic head groups mounted 180 degrees opposite to the first magnetic head 4, and 39a denotes a track pattern drawn by the first magnetic head 4. , 40a are track patterns drawn by the second magnetic head 3, 41a are track patterns drawn by the third magnetic head 2, 42 are track patterns drawn by the fourth magnetic head 32, and 25 is drawn by the fifth magnetic head 22. Track pattern, 7, 4
4, 33, 34 are lower end positions of the magnetic heads 3, 2, 32, 22.

[0006] A part of the track pattern 39a recorded by the first magnetic head 4 is erased to the lower end position 7 of the second magnetic head 3, leaving the track pattern 19 and the track recorded by the second magnetic head 3. A part of the pattern 40a is erased to the lower end position 44 of the third magnetic head 2, leaving the track pattern 18, and a part of the track pattern 41a recorded by the third magnetic head 2 is removed from the fourth magnetic head 32. Of the track pattern 1
7, a part of the track pattern 42 recorded by the fourth magnetic head 32 is erased to the lower end position 34 of the fifth magnetic head 22, and the track pattern 36 is recorded by the fifth magnetic head 22 while remaining. Since the next magnetic head does not pass through the track pattern 25, the width of the magnetic head 22 still remains. Track pattern 19, 1
Tracks 8 and 17 have the track width determined by the recording format.

The width of the track patterns 19, 18, 17 is determined by the mounting error ± Δh of the lower end positions 7, 44, 33 of the magnetic heads 3, 2, 32.
In the worst case, when the mounting error of the magnetic heads 3, 2, 32 is + Δh and the mounting error of the magnetic head 22 is −Δh, the width of 6 may be reduced by 4Δh due to the addition of all the errors Δh. There is a possibility that a narrow track width is formed. Furthermore, the upper end of the track pattern 42 drawn by the fourth magnetic head 32 is usually overwritten at the lower end of the fifth magnetic head 22 by overwriting, leaving a regular track pattern 36. The pattern 42 remains.
That is, since the magnetic head gap width tolerance ± Δw cannot be avoided, the error at the upper end of the track pattern 42 drawn by the fourth magnetic head 32 is smaller than that of the second to fourth magnetic heads 3, 2, 32. Cumulative mounting tolerance (3Δh)
And the gap width tolerance (Δw) of the fourth magnetic head 32. On the other hand, due to these shifts, the relative height of the tracks shifts, and the accuracy of tracking deteriorates.

When insert editing is performed in such a magnetic head arrangement, there is no particular problem in the first insert editing except that the adjacent old track pattern is thinned, but the second and subsequent insert edits are performed in the same place. This causes the following problems. FIG. 9 shows a magnetic recording / reproducing apparatus having a rotary erasing head for performing insert editing by two.
FIG. 26 is a first rotating erase head, and 30 is a second rotating erase head.

For example, recording is performed by a combination of a group of magnetic heads capable of recording with a reference track width, and a track pattern 1 is recorded.
Leave 9, 18, 17, 34. Into this, insert recording is performed by the same group of magnetic heads. First, in order to reduce the occurrence of unerased data, the old tracks 19 and 1 are rotated by a rotary erase head 26 slightly wider than four track widths.
8, 17, and 34 are erased, and then track patterns 19a, 18a, 17a, and 42 are inserted. The width of the track pattern 42 becomes the width of the magnetic head 22 and becomes wider than the reference track pattern width, and the track pattern 42 and the adjacent track 43 are adjacent or overwritten. On the other hand, a guard band 28 is formed between the adjacent track pattern 35 and the track pattern 19a, and no unerased portion is generated. This track 17a, 18a, 19
When the second insert editing is performed again on a and 42, for example, when the width of the fourth magnetic head overlaps with the tolerance + Δw and the mounting overlaps with the accumulation of the tolerance + 3Δh, or when the width of the rotary erase head 30 is slightly narrower For example, there may be a case where a track pattern 37 is left unerased from the old track pattern 42 of the first insert. That is, the accuracy of the track is determined as a result of the accumulation of the height error and the width error between the heads.

[0010]

However, in the above-mentioned conventional configuration, the track width is partially narrowed with respect to the reference recording track width, and the output is reduced, so that it is difficult to obtain a good signal output. Also, at the edit point, an unerased portion in the same azimuth direction occurs, the output of which is taken out by the magnetic head, the output of the old track during the main output becomes large, and the error rate becomes poor, or the width of the magnetic head is wider than the reference track. In addition, there is a problem that accurate tracking is difficult to obtain because of the large variation in the width of the formed track pattern.

The present invention solves the above-mentioned various problems of the prior art, and provides a magnetic recording / reproducing apparatus capable of performing accurate tracking with a small variation in the width and relative position of a track pattern to be formed and an accurate insert. Editing
It is an object of the present invention to provide a possible magnetic recording / reproducing apparatus .

[0012]

In order to achieve this object, a magnetic recording and reproducing apparatus according to the present invention comprises an even number of helical tracks.
Magnetic recording is performed using a magnetic recording method that records a group of signals
A magnetic recording and reproducing apparatus, comprising: a plurality of magnetic recording devices for recording signals;
A head drum equipped with a magnetic recording head;
Of the helical track,
Of the helical tracks recorded last in time
The magnetic recording head for recording
Specify the mounting tolerance of the recording head or magnetic recording
The lower end of each magnetic head is
Specify mounting tolerances or under magnetic recording head
The lower end of each magnetic head and fly
It has a configuration that defines the mounting tolerance of the upper end of the grease head .

[0013]

According to the present invention, with the above construction, the mounting reference of the group of heads coincides with the last track of the group of helical tracks on the tape pattern, and the width error and the mounting height error of the magnetic head are large. A helical track can be recorded under such a condition, and a tape pattern in which the width error and the mounting height error of the flying erase head are minimized at the editing point and the influence of the mounting error and the width error of the recording head can be left.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic side view of a magnetic head arrangement in a height direction of a head drum device of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention, the height of which is set in the direction of the rotation axis. In FIG. 1, 10Rb is a reference magnetic head, B is a mounting reference at the lower end of the magnetic head 10Rb, 10Ra is a magnetic head, and 9Eb is a flying erase head (hereinafter referred to as FE).
9Ea is the FE head, W1 is the track width of the magnetic heads 10Ra and 10Rb, W2 is the track width of the FE heads 9Ea and 9Eb, and h1 is the magnetic head 10R.
The mounting height of a, h2 and h3 are FE heads 9Eb and 9Ea
Is the tolerance between the track widths W1, W2 and the mounting heights h1, h2, h3.

The magnetic heads 10Ra and 10Rb have a function of recording on a magnetic tape, and record helical tracks on the magnetic tape. The FE heads 9Ea and 9Eb erase the recorded helical tracks. The arrangement of the magnetic heads 10Ra, 10Rb and the FE head will be described. The arrangement of all the magnetic heads is the magnetic head 10Rb.
The lower end 5 is the mounting reference B. The position of the magnetic head 10Ra is defined by the mounting height h1 from the mounting reference B to the lower end 6 of the magnetic head 10Ra. On the other hand, the FE heads 9Ea and 9E
The position of “b” is from the mounting reference B to the FE heads 9Ea and 9Eb.
Are defined by h3 and h2.

FIG. 2 is a schematic plan view showing the relative positional relationship of the magnetic recording and reproducing apparatus according to the first embodiment of the present invention with respect to the rotation direction of the magnetic head. In FIG. 2, 1 is a rotary drum, 10Rb is a reference magnetic head, 10Rb.
Ra is a magnetic head, 9Ea and 9Eb are FE heads. FIG. 3 is a side view showing the mounting of the magnetic head 10Rb and the FE head 9Eb of the magnetic recording and reproducing apparatus according to the first embodiment of the present invention. Windows 3 and 4 are formed in the rotating drum 1, and a magnetic head 10Rb and an FE head 9Eb protrude therefrom. The magnetic head 10Ra and the FE head 9Ea protrude from the back side of the figure shown in FIG.

FIG. 4 is a schematic diagram of a magnetic recording pattern used in the magnetic recording and reproducing apparatus according to the first embodiment of the present invention. In FIG. 4, T1 to T12 are helical tracks on which signals for one frame are recorded, and 2 is a magnetic tape.
Helical trucks T1, T3, T5, T7, T9, T1
Reference numeral 1 denotes a helical track T by a magnetic head 10Ra.
2, T4, T6, T8, T10 and T12 are magnetic heads 1
0Rb is recorded on the magnetic tape 2. Where 1
Considering frame insert editing, the in point and the out point are determined by the lower end position of the magnetic head 10Ra and the upper end position of the magnetic head 10Rb for recording T1 and T12, respectively.
That is, at the in point, the lower end 6 of the magnetic head 10Ra erodes the T1 side of the helical track T12. At this time, the mounting error of the magnetic head 10Ra is h1 ± Δ, and is usually set to h1 = 0.
Δ.

FIG. 5 shows the positional relationship between the helical track near the out point and the magnetic head of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention. At the out point, the upper end of the magnetic head 10Rb for recording T12 erodes the lower end of the helical track T1 for the width tolerance ± Δ of the width W1 of the magnetic head 10Rb. That is, the mounting tolerance ± Δ and the width tolerance ± Δ of the magnetic heads 10Ra and 10Rb do not overlap at the in-point and out-point, and do not become ± 2Δ.

FIG. 6 is a schematic diagram of a helical track and a magnetic head during insert editing of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention. In FIG. 6, helical tracks T1, T3, T5 drawn by a magnetic head 10Ra.
Helical tracks T2, T4, T6 drawn with FE head 11Fb and magnetic head 10Rb with T7, T9, T11.
T8, T10, and T12 are erased by the FE head 11Fa.

At this time, since the upper end of the helical track T1 coincides with the lower end of the magnetic head 10Rb at the out point, the lower end of T1 is eroded by ± Δ of the mounting height error of the upper end of the FE head 11Fa and the magnetic head. This is ± 3Δ, the sum of the mounting error ± Δ and the width error ± Δ of 10Ra. On the other hand, at the in-point, the erosion on the helical track T12 is ± 2Δ, which is the sum of ± Δ of the mounting height error and ± Δ of the width error of the FE head 11Fb. The lower end of the helical track T12 is the lower end 1 of the magnetic head 10Rb itself. And the error is ± 2
Δ.

Therefore, the erosion of the FE head is 2Δ at the maximum.
It is. On the other hand, since data is constantly rewritten between 10Ra and 10Rb, there is no influence of an error. In the present invention, FE
Although the upper end of the head 11Fb is specified, it goes without saying that the lower end of the FE head may be used.

[0023]

As described above, according to the present invention, the width of the helical track is determined by using the magnetic recording head that records the last helical track in time of the even number of helical tracks as a group of signals as the mounting reference head. Helical tracks can be formed stably, and the practical effect is great. Also, when editing inserts,
And out point positioning is accurate,
This allows insert editing without any leftovers.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a magnetic head arrangement of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic plan view showing a magnetic head arrangement of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 3 is a side view of a magnetic head mounted in a magnetic head arrangement of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram of a magnetic recording pattern used in the magnetic recording and reproducing apparatus according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a helical track and a magnetic head of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram of a helical track and a magnetic head during insert editing of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 7 is a schematic diagram of a head arrangement of a conventional magnetic recording / reproducing apparatus.

FIG. 8 is a schematic diagram of a recording track in a head arrangement of a conventional magnetic recording / reproducing apparatus.

FIG. 9 is a schematic diagram of a helical track at the time of insertion in a head arrangement of a magnetic recording / reproducing apparatus of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 rotating drum 2 magnetic tape 3, 4 window 9Ea, 9Eb FE head 10Ra, 10Rb recording head

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Yoda 1006 Kazuma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-3-254415 (JP, A) JP-A-6-600 243409 (JP, A) JP-A-1-182914 (JP, A) JP-A-62-264417 (JP, A) JP-A-57-210490 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 5/53

Claims (3)

(57) [Claims] An even helical device having a plurality of magnetic recording heads and inclined with respect to a longitudinal direction of a magnetic tape.
A track is provided with a group of signals using the magnetic recording head.
The magnetic recording format for recording as a signal
A magnetic recording / reproducing device that records signals on tape
And tracing the helical truck while the group of signals
Last in time, and
The last recorded magnetic field at the edit-out point
Other magnetic recording with the lower end of the recording head as the mounting reference
Magnetic head characterized by head tolerance
Recording and playback device . 2. An even-numbered helical having a plurality of magnetic recording heads and being inclined with respect to a longitudinal direction of a magnetic tape.
A signal is put on a track by using the magnetic head as a group of signals.
The magnetic tape in a magnetic recording format for recording as
A magnetic recording / reproducing apparatus for recording signals to a group of signals while tracing the helical track.
Record the last time in the
The last recorded magnetic field at the edit point
The lower end of the magnetic recording head is
The lower end of the recording head to a predetermined height, including mounting tolerances.
A magnetic recording / reproducing apparatus characterized in that: 3. An even-numbered helical having a plurality of magnetic recording heads and being inclined with respect to the longitudinal direction of the magnetic tape.
A track is provided with a group of signals using the magnetic recording head.
The magnetic recording format for recording as a signal
A magnetic recording / reproducing device that records signals on tape
And tracing the helical truck while the group of signals
Last in time, and
The last recorded magnetic field at the edit-out point
Other magnetic recording with the lower end of the recording head as the mounting reference
Of the flying erase head
It is characterized in that it has been specified to a predetermined height including mounting tolerances
Magnetic recording and reproducing device .