JPH0457211A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To accelerate a data transfer speed by arranging plural recording head gaps for recording a track in synchronization and plural reproducing head gaps for scanning simultaneously but for the time without overlapping with the former group on a rotary drum. CONSTITUTION:The rotary drum 1 is provided with four combination heads arranged at anguler intervals of 90 deg.. The heads of A1 and B1 are both for recording, while the heads of A2 and B2 in angular positions of 180 deg. with the above group are both for recording as well. Then, the heads of A1' and B1' are both for reproducing, and the heads of A2' and B2' in angular positions of 180 deg. with the above group are both for reproducing as well. Then, a magnetic tape T is wound around the rotary drum 1 at approximately 90 deg. to travel. Thus, since recording or reproducing is performed by every plural tracks, the transfer time of a data at the time of recording or reproducing is shortened, and also since the scanning is not overlapped by time, no cross talk takes place between a recording system and a reproducing system.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a magnetic recording/reproducing device used for backing up computer data or recording/reproducing music information, and particularly relates to a magnetic recording/reproducing device used for backing up computer data or recording/reproducing music information. death,
Moreover, the present invention relates to a magnetic recording/reproducing device that prevents crosstalk between recorded signals and reproduced signals.

[Prior Art] FIG. 7 shows a rotary head device mounted on a conventional magnetic recording/reproducing device for DAT.

This conventional example is used for backing up computer data, and has a verify function for performing read-after-write operations. Of the four magnetic heads, A and B are recording magnetic heads, and A'
and B' are magnetic heads for reproduction. Figure 8 shows the recording signals (A) and A which are written by heads A and B.
Reproduction signals (B) from the 'head and the B' head are shown along the time axis.

FIG. 8 shows a situation in which a lead aft write is performed. In the magnetic recording and reproducing apparatus for DAT, as shown in FIG. 7, the magnetic tape T is wound around the rotating drum 1 at an angle of approximately 90 degrees. Therefore, the recording signals produced by the recording heads A and B arranged at an interval of 180° become temporally intermittent as shown in FIG. 8(A).

Furthermore, the playback heads A' and B' are connected to the above-mentioned A, B heads and 9.
Since it is provided with a phase of 0°, the reproduced signal becomes an intermittent signal that does not overlap with the recorded signal on the time axis, as shown in FIG. 8(B). In read-after-write, this reproduction signal is used to confirm whether or not the signal has been reliably recorded on the tape.

[Problems to be Solved by the Invention] However, as shown in FIG. 8, this type of magnetic recording/reproducing device for DAT has intermittent portions of the signal along the time axis. I can't shorten the time. When used for backing up computer data, the processing speed of computers has improved year by year, so the recording or reproducing processing speed of the magnetic recording/reproducing device for DAT with the above structure can keep up with the data transfer time from the convenience store. It's becoming impossible. Therefore, it is necessary to put the computer in a standby state until writing of a predetermined amount of data is completed.

Therefore, as shown in FIG. 9, it is conceivable to use a rotary head device equipped with an eight-channel head. In this device, A1. Ax and BIB2 are magnetic heads for recording;

The Ax', BI', and Bz' heads are playback heads. Head A and head B and ' are combination heads, and the heads of other parts are also combination heads. FIG. 10 shows a recording signal (A) and a reproduction signal (B) produced by the rotary head device shown in FIG. 9. The winding angle of the magnetic tape is 90°, and A
,,A1. Bl.

The B2 head allows continuous recording without any intermittent sections. Also, A,',Aa'+ B,',B.

The head allows reproduction without providing any intermittent sections, making it possible to speed up the transfer time for data recording and reproduction.

However, in the above device, in the read-after-write operation, the recorded signal and the reproduced signal overlap on the time axis, so the recording signal system and the reproduced signal system are separated in the low retransformer provided in the rotary head device. The problem of crosstalk between Therefore, in order to eliminate this crosstalk, it is necessary to consider the structure of the low retransistor or take measures against crosstalk in the electric circuit. Recently, this type of device has become smaller, and the rotating drum 1 has also become smaller in diameter, so it is necessary to use a small-diameter low retrans. The signal transmission paths of the system become closer,
It has become even more difficult to eliminate crosstalk than with conventional methods.

The present invention solves the above-mentioned conventional problems, and aims to provide a magnetic recording and reproducing device that can increase the data transfer speed and prevent crosstalk between recorded signals and reproduced signals. .

[Means for Solving the Problems] A magnetic recording and reproducing device according to the present invention is a magnetic recording and reproducing device that is provided with a rotating drum on which a magnetic head is mounted, and in which a magnetic tape is wound around the rotating drum and runs. The rotating drum has a plurality of recording head gaps having different azimuth angles for simultaneously recording signals on adjacent tracks on the tape, and recording head gaps on the tape at times that do not overlap with the scanning of the recording head gaps. The apparatus is characterized by being provided with a plurality of reproduction head gaps that simultaneously scan a plurality of tracks.

[For Use] In the above means, a combination head or the like is used to simultaneously record on a plurality of tracks, for example, two adjacent tracks, using a recording head gap. In addition, a plurality of reproduction head gaps are provided, so that, for example, two adjacent tracks can be reproduced at the same time. At this time, the recording operation and the playback operation do not overlap in time, so when performing read-after-write,
There is no crosstalk between the recording signal system and the reproduction signal system via a low retransistor or the like. Further, the data transfer time for recording and reproducing is the same as that of the apparatus shown in FIG. 9, and higher speed and higher density can be achieved.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings of FIGS. 1 to 8.

FIG. 1 is a plan view showing a rotary head device used in a magnetic recording/reproducing apparatus according to the present invention.

In this device, four
Two combination heads are provided. The heads A1 and B1 are both for recording, and the heads A2 and B2, which are located at an angular position of 180 degrees, are also for recording.

Further, the heads A1 and B+' are both for reproduction, and the heads A2' and B2' located at angular positions of 180 degrees from these are also for reproduction. In addition, the magnetic tape T is connected to the rotating drum 1.
It travels while being wrapped at an angle of approximately 90° to the vehicle.

Fig. 2 is an enlarged front view showing the combination heads A and B1 from the outside of the drum (the side viewed from arrow II in Fig. 1), and Fig. 3 shows the state in which the head gap of this combination head is scanning the tape T. 1 from the tape recording surface side, that is, from the rotary drum 1 side (the side opposite to the direction of arrow II in FIG. 1).

As shown in FIG. 2, in the combination head, recording heads A, B are mounted on a head base 2 fixed to a rotating drum 1 by adhesive or other means. The rotary head device shown in Fig. 1 is of a helical scan type, and the head is (
b), the head scans the tape diagonally.

Here, the head gap GAl of the A1 head and the gap GBI of the B head have opposite azimuth angles with respect to the scanning direction (b). and A, the head gap G of the head
Al slightly precedes, and the gap G+z of the B+ head follows, but both gaps GAl and G□ are in a positional relationship such that an overlap amount δ is formed in the width direction with respect to the scanning direction. This amount of overlap δ is the gap GA
This is an override area when GBI performs recording after recording by I. Also, the width of the recorded track is the dimension a
It can be determined by This a is approximately 13.6 um. To explain in more detail in FIG. 3, the head gap GAI of the A head and the gap G Bl of the B1 head scan the tape T almost simultaneously at a short time interval. FIG. 3 shows a state in which gap G Al is recording track T Al, and Gll is recording track Tal+. In the recording operation using gap G Al,
The adjacent part of the track T12 recorded before that is δ
Override by the width of . Then, in the recording operation of <6.1 at a minute interval from G Al, the adjacent portion of track T Al is overwritten by a width of δ. Head Gap G of A1 Head Gap G1 of Al and B1 heads starts scanning the tape T almost simultaneously and completes the scanning. A2', which is arranged at 90° intervals with this recording head.
The head and the B2' head are also combination heads as shown in FIG. Then, during the next 90° rotation time after the A1 head and the B head complete scanning, the gap of the At' head scans the track T Am, the gap of the B2' head scans the track T, □, and these The recording status is checked by playing back the signal recorded on the track. During the next 90° rotation period, the recording head A,
The next two tracks are recorded almost simultaneously by the head and the B2 head (a combination head having the same configuration as in FIG. 2). Furthermore, during the next 90° rotation time, A1'
Tracks TAl and TII are scanned by the heads B1' and B1', respectively, and reproduced to check the recording state.

FIG. 4(A) shows the recorded signal in the above operation on the time axis, and FIG. 4(B) shows the reproduced signal by read-after-write. Each of the combination heads is arranged at 90 degrees, and the recording signal by the recording head and the reproduction signal by the reproduction head do not overlap in time. Therefore, the problem of crosstalk between recording system and reproduction system signals does not occur in a signal transmission path such as a rotary transformer. Furthermore, as can be seen by comparing FIG. 4 and FIG. 10, the transfer speed in data recording and reproduction is equivalent to that of a conventional rotary head device with an 8-channel configuration.

Next, FIG. 5 shows the reproduction operation.

The playback operation is performed by A, ', B, ' heads and A2', B2.
'It is carried out by the head. Figure 5 shows A,',B,'
The head gaps G Al' and GBl' are shown scanning the tracks T Al and T at. This reproducing head is a combination head having almost the same configuration as the recording head shown in FIG.
Al′ and G Bl′ are track TAI almost simultaneously.
and 711.

FIG. 6 shows another embodiment of the head configuration. This head is, for example, a thin film head, and the gap G Al of the recording head A and the gap G of the head B1 are formed on the same surface. In this case, each head gap G Al
The width dimensions of and Gel match the track width dimension a,
An override region as shown in FIGS. 2 and 3 is not formed.

Alternatively, it is also possible to make the width of the gap G Ml slightly larger than G A l so that it is overridden every two tracks.

[Effects] As described above, according to the present invention, since recording or playback is performed for each of a plurality of tracks, the data transfer time during recording or playback can be shortened, making it possible to keep up with the processing time of a computer, etc. . Furthermore, since the scans of the recording head and the reproducing head do not overlap in time, crosstalk does not occur between the recording system and the reproducing system when performing read-after-write.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a rotary head device used in the magnetic recording and reproducing apparatus of the present invention, and FIG. 2 is an enlarged front view showing the recording combination head from the side shown by the arrow.
Fig. 3 is a plan view showing the scanning state of the head from the recording surface side of the tape, Figs. 4 (A) and (B) are explanatory diagrams showing the recording signal and the reproduced signal on the time axis, and Fig. 5 is the reproduction 6 is a plan view showing the head scanning state in operation; FIG. 6 is a front view showing another configuration of the magnetic head; FIG. 7 is a plan view showing a rotary head device used in a conventional magnetic recording/reproducing device; FIG. figure(
A) and CB) are explanatory diagrams showing recording signals and reproduction signals in the conventional example of FIG. 7 on a time axis, and FIG. 9 is a plan view showing a rotary head device used in a conventional magnetic recording and reproducing apparatus. 10(A) and CB) are explanatory diagrams showing recording signals and reproduction signals in the conventional example of FIG. 9 on the time axis. A, B,,A,,B,... Recording head, A,
',B,',A2',B,'... Playback head, l.
...Rotating drum. □(a) 4th 5th 6th

Claims (1)

[Claims] 1. A magnetic recording and reproducing device that is provided with a rotating drum on which a magnetic head is mounted, and in which a magnetic tape is wound around the rotating drum and runs, and the rotating drum includes:
A plurality of recording head gaps that simultaneously record signals on adjacent tracks on the tape with different azimuth angles, and a plurality of recording head gaps that simultaneously scan the plurality of tracks on the tape at times that do not overlap with the scanning of the recording head gaps. A magnetic recording and reproducing device characterized in that a reproducing head gap is provided.