JPH06231438A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To easily reproduce magnetic tapes with formats different in the number of pieces of tracks from each other by controlling a distance between both ends of both end magnetic heads with the width of plural helical tracks in plural magnetic reproducing heads reproducing a first magnetic recording format. CONSTITUTION:First to fourth helical tracks of a group of helical tracks being four tracks in the first magnetic recording format are shown by 1-4 in a caption, and first to fourth magnetic reproducing heads reproducing the first to fourth helical tracks are shown by 5-8 in the caption. Both ends of each pair of heads 5 and 6 and heads 7 and 8 exist within the range of the helical tracks 1-4 of a group of the first format, and the head arrangement of first heads 11, 12 is taken. Further, the lower end of the first head 5 and the upper end of the fourth head 8 are matched with the width of the group of tracks 1-4 for removing the effect of the erase remainder 18 in a second format. Respective heads 5, 6 reproducing the second format by using the heads 5-8 selectively are put on-track on the tracks 9, 10, and reproducing is possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a magnetic head arrangement which is less affected by adjacent helical tracks in a magnetic recording / reproducing apparatus and an unerased portion at the time of editing, and mechanical compatibility between magnetic recording formats having different helical tracks. The present invention relates to a magnetic recording / reproducing device capable of maintaining the above.

[0002]

2. Description of the Related Art In recent years, a recording / reproducing apparatus utilizing magnetic recording has been widely used in VTRs and the like, and as a tendency thereof, a head drum device is mechanically mechanically compared with a conventional one due to an increase in signal amount due to digitization and the like. Is high speed rotation, short wavelength recording,
The track is becoming narrower. On the other hand, with regard to signals, the number of channels has been increased, and two-channel recording and further handling of signals of four or more channels are available. Some functions include those having a magnetic recording head and a magnetic reproducing head and capable of simultaneous reproduction. .

Generally, the arrangement of a plurality of magnetic reproducing heads has the magnetic head arrangement shown in FIG. 5 when four channels are taken as an example in the first magnetic recording format. In FIG. 5, 1, 2, 3, and 4 are the first and first groups
2, 3 and 4 helical tracks, 18 is the unerased part generated during editing, and 13, 14, 15, and 16 are the first, second, third, fourth
A magnetic reproducing head for reproducing the helical tracks 1, 2, 3, 4. The magnetic reproducing heads 13, 14, 15 and 16 are usually installed so as to be centered with respect to the helical tracks 1, 2, 3 and 4 for reproducing the magnetic reproducing heads. At the edit point, the unerased portion 18 may occur, and in the present example, the first unerased portion 18 may be reproduced by the first magnetic reproducing head 13.

On the other hand, in the magnetic recording / reproducing apparatus for reproducing the first magnetic recording format, the magnetic reproducing heads 13, 14, 1 for reproducing the second magnetic recording format.
The relationship between 5, 16 and the helical track is shown in FIG. Figure 6
Uses the magnetic reproducing heads 13 and 14 of these magnetic reproducing heads 13, 14, 15 and 16 to reproduce the helical tracks 9 and 10 of the second magnetic recording format. In the recording format, two helical tracks 9 and 10 are set as a group, and there is a possibility that an unerased track 18 has been generated at the editing point, so there is a possibility that the unerased track will be reproduced. The first magnetic recording format and the second magnetic recording format have a doubled magnetic tape speed, and the helical tracks 1, 2, 3, 4, 9 and 10 have the same track width. There is.

[0005]

However, in the above-mentioned conventional configuration, when reproducing the first or second magnetic recording format, the unerased portion of the adjacent helical track at the editing point is reproduced, and the adjacent recording track is reproduced. There is a problem that the reproduced signal is deteriorated due to mixing of the unerased signal with the reproduced signal.

The present invention is to solve the above-mentioned various problems of the related art. In the magnetic recording / reproducing apparatus of the first magnetic recording format, good reproduction output can be obtained, and in the magnetic recording / reproducing apparatus of the second aspect, It is an object of the present invention to provide a magnetic recording / reproducing apparatus capable of obtaining a good reproduction output even in reproduction of the magnetic recording format.

[0007]

To achieve this object, in a magnetic recording / reproducing apparatus of the present invention, both ends of a magnetic reproducing head forming a plurality of groups are regulated by both ends of a plurality of helical tracks forming a group. Alternatively, in a magnetic recording / reproducing apparatus for recording / reproducing the first magnetic recording format, in order to reproduce well the second magnetic recording format, in the magnetic reproducing head arrangement for reproducing the first magnetic recording format. , A magnetic reproducing head arrangement for reproducing the first magnetic format.

[0008]

According to the present invention, with the above construction, the plurality of magnetic reproducing heads for reproducing the first magnetic recording format are controlled by the width of the plurality of helical tracks between the both ends of the magnetic heads. Since the unerased portion at the point is not reproduced, and since the magnetic head arrangement for reproducing the second magnetic format is included in the magnetic reproducing heads, the first magnetic recording format and the second magnetic recording format are also included. It is possible to reduce the influence of adjacent helical tracks of the recording format and the reproduction of the unerased portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the first aspect of the present invention will be described with reference to FIG. FIG. 1 is a schematic view of a helical track and a magnetic reproducing head showing an embodiment of the present invention. In FIG. 1, reference numerals 1, 2, 3, and 4 denote four tracks in the first magnetic recording format, which form a group of helical tracks.
3,4 helical tracks, 5,6,7,8 are the first
The first, second, to play 2,3,4 helical tracks
3 and 4 magnetic reproducing heads.

FIG. 2 is a schematic view of a helical track and a magnetic reproducing head showing a second magnetic recording format. In FIG. 2, 9 and 10 are first and second helical tracks which are a group of helical tracks in the first magnetic recording format, and 11 and 12 are first and second helical tracks for reproducing the first and second helical tracks. It is a magnetic head. For example, in the present embodiment, the first magnetic heads 11 and 12 have a helical track adjacent to the pair of first and second helical tracks 9 and 10 in order to eliminate the influence of the unerased portion at the time of editing. In order not to scan, both ends are set so as to be within a group of tracks.

First for the second magnetic recording format
As described above, since the traveling speed of the magnetic tape is set to double, the magnetic recording format of the second magnetic recording format has four helical tracks for the two helical tracks of the first magnetic recording format. The helical tracks form one group, and the helical tracks have the same track width.

In the head arrangement shown in the schematic diagram of FIG. 1, the magnetic reproducing heads 5 and 6 and the magnetic reproducing heads 7 and 8 have a helical track range in which both ends are a group of the first magnetic recording format. And has the head arrangement of the first magnetic reproducing heads 11 and 12. Further, in order to eliminate the influence of the unerased portion 18 in the second magnetic recording format, the lower end of the first magnetic reproducing head 5 and the upper end of the fourth magnetic reproducing head 8 are provided with helical tracks 1, 2, 3, 4.
It fits the width of the group.

When the second magnetic recording format is reproduced by using the magnetic heads 5, 6, 7, 8 shown in FIG. 1 and selectively reproducing by the magnetic reproducing heads 5, 6, the respective magnetic reproducing heads 5, 6 are helical. Tracks 9 and 10 are on-track and can be reproduced. In addition, the magnetic reproducing heads 5 at both ends
Since 6 does not scan the outside of the helical tracks 9 and 10 of the first group, it does not scan the unerased portion at the time of editing.

Further, the magnetic reproducing heads 5, 6, shown in FIG.
Since the arrangement is provided in 7, 8, the pair of magnetic heads 5, 6 is selectively used to reproduce the second magnetic recording format as in the case of reproducing the first magnetic recording format. It is renewable. This state is shown in FIG. At this time,
The unerased portion 18 adjacent to it is outside the magnetic reproducing head 6,
Do not play the eraser 18.

The height calculation of the magnetic reproducing heads 1, 2, 3, 4 will be described with reference to FIG. In FIG. 4, X1, X
2, X3 is the horizontal distance from the first magnetic head 5 of the second, third and fourth magnetic reproducing heads 6, 7 and 8, and H1 is the lower end of the first magnetic reproducing head 5 to the second magnetic reproducing head. 6, H2 is the distance from the lower end of the first magnetic reproducing head 5 to the lower end of the third magnetic head 7, and H3 is the first distance.
From the lower end of the magnetic reproducing head 5 to the fourth magnetic reproducing head 8
To the upper end of the magnetic reproducing head, θ1 is the angular difference between the rotating direction (still direction) of the magnetic reproducing head and the helical tracks 9 and 10, and θ2 is the still direction and the helical tracks 1, 2, 3, 3.
It is an angle with 4.

The relational expression is shown below, where P is the helical track width. In order to reproduce the helical tracks 9 and 10 of the second magnetic reproduction format, the upper end of the second magnetic reproduction head 6 is aligned with the upper end of the helical track 10, so that the height of the upper end of the second magnetic reproduction head 6 is increased. H1 is H1 = 2xP-X1xtan (θ1) helical track 1 of the first magnetic recording format.
A fourth magnetic reproducing head 8 for reproducing 2, 3, 4
Since the upper end of is aligned with the upper end of the helical track 4,
The height H3 of the upper end of the fourth magnetic reproducing head 8 is H3 = 4xP-X3xtan (θ2). The height H2 of the third magnetic reproducing head 7 to the lower end is sufficient to reproduce only the helical track 3. H2 = 2 × P−X2xtan (θ2), respectively. If the positional relationship of the magnetic reproducing head is determined according to this equation, good reproduction output can be obtained for both of the two magnetic recording formats.

[0017]

As described above, according to the present invention, magnetic tapes of different magnetic recording formats having different numbers of helical tracks can be easily reproduced, and its practical effect is very large.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is a schematic view of the arrangement of magnetic heads in a second magnetic recording format which is the subject of the present invention.

FIG. 3 is a schematic diagram of reproduction of a second magnetic recording format in the embodiment of the present invention.

FIG. 4 is a schematic diagram showing a positional relationship in an embodiment of the present invention.

FIG. 5 is a schematic view of a magnetic head arrangement in a conventional first magnetic recording format.

FIG. 6 is a schematic view of reproduction of a second magnetic recording format in an arrangement example of magnetic heads in the conventional first magnetic recording format.

[Explanation of symbols]

1 1st helical track of 1st magnetic recording format 2 2nd helical track of 1st magnetic recording format 3 3rd helical track of 1st magnetic recording format 4 4th of 1st magnetic recording format Helical track 5 first magnetic head in first magnetic recording format 6 second magnetic head in first magnetic recording format 7 third magnetic head in first magnetic recording format 8 first in magnetic recording format 4 magnetic head 9 1st helical track of 2nd magnetic recording format 10 2nd helical track of 2nd magnetic recording format 11 1st magnetic head of 2nd magnetic recording format 12 2nd magnetic recording format Second magnetic head 13 first magnetic recording format first magnetic head 14th The second magnetic head 15 fourth magnetic head of the third magnetic head 16 first magnetic recording format of the first magnetic recording format of the magnetic recording format

Claims (2)

[Claims] 1. A magnetic reproducing head arrangement for reproducing a first magnetic recording format having a plurality of helical tracks as one group, wherein the arrangement of the plurality of magnetic reproducing heads is restricted at both ends of the helical track. Magnetic recording / reproducing device. 2. A second magnetic recording format having a plurality of adjacent helical tracks as one group, and a first magnetic recording format having one group of adjacent helical tracks that is an integral multiple of the second magnetic recording format. Of a plurality of magnetic head groups for reproducing the first magnetic recording format of the magnetic recording / reproducing apparatus capable of reproducing the data, a magnetic head arrangement for reproducing at least one second magnetic recording format is included. A magnetic recording / reproducing apparatus characterized in that