JPS5992418A - Multi-element magnetic head - Google Patents

Abstract

PURPOSE:To attain the reciprocating azimuth record and reproduction by setting the number of tracks of two of erasing, recording and reproducing magnetic heads larger than the desired number by >=2 tracks and unifying these heads with a prescribed space secured among those heads. CONSTITUTION:A recording head 1, a reproducing head 2 and an erasing head 3 have azimuth angle theta and track pitch P, and at the same time spaces A and B among gap surfaces of those magnetic heads are set as A=P.Tantheta and B= P.Tantheta, respectively. Then the magnetic head is tilted by a mechanical means by an azimuth angle theta to the traveling directin of a magnetic tape 3. Thus the correspondence is secured between tracks (b), (c), (d) and (e) of the head 1 and tracks (a), (b), (c) and (d) of the head 2 with no shift. The tape 3 is removed in its coming-back route and then loaded again to a tape driving mechanism to be set the tape upside down. Then the head 2 is reversed by 2 to perform the reverse azimuth recording. Thus a track shift due to the azimuth angles of those three magnetic heads is not produced. As a result, the record/reproduction is possible after the assured erasion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a multi-element magnetic head that integrates erasing, recording, and reproducing magnetic heads to realize a reciprocating azimuth recording method.

[Prior art]

In recent years, with the improvement of e-recording standards, digital recording (PC)
Is M@) popular? This has been developed especially.

cassette anchor, fixed head using tape
The CM tape L/Koda has a paper-cutting property of 1. It is attracting attention because of the merits of downsizing the drive mechanism.

The above fixed head methods can be roughly divided into 1. Two types of magnetic heads are used: a magnetic head for both recording and reproduction (1 head) 2 and a magnetic head for recording and reproduction only (2 hects). In the former one-head system, a conventional bulk magnetic head with a winding wire is arranged in a number of tracks. This method has the disadvantage that sufficient playback sensitivity cannot be obtained when the tape speed becomes slow because the number of windings is greater than the space limit between adjacent tracks.On the other hand, the latter two-head method In this case, there is an advantage that the playback head has a degree of freedom and, for example, if a magnetic flux response type magnetoresistive head is used, sufficient playback sensitivity can be obtained even when the tape speed is slow.Advantages of recording density The latter two-head system is becoming more mainstream.

A conventional example of a two-head system will be described below.

FIG. 1 is a plan view of a conventional multi-element magnetic head. l
2 is a recording magnetic head, 2 is a reproducing magnetic head, 3 is a magnetic tape, and 4 is a running direction of the magnetic tape.

In the figure, a, b, c, . . . , g correspond to the magnetic gap of each track of each magnetic helad 1, 2. As the magnetic heads 1 and 2, thin film inductive heads and magnetoresistive heads, which are formed on a substrate by a thin film forming process, are generally used. In the conventional example configured in this way, each track (track width T
) A guard band (G) is required to prevent crosstalk between the tracks of the recording magnetic head 1 and fringing between the tracks of the recorded magnetic tape, so the magnetic tape cannot be used effectively. There is a problem that this results in a decrease in recording density.

On the other hand, as a method for eliminating such a guard band G, an azimuth method, which has already been adopted in VTRs and the like, can be considered, in which an azimuth angle is set for each track. One way to achieve the azimuth system with a two-head system is to use separate azimuth angle adjustment mechanisms for the magnetic head 1 for recording and the magnetic head 2 for reproduction, but the adjustment mechanism is complicated and requires high accuracy. There is a drawback that adjustment is required. Another method is to implement the azimuth method using integrated recording and reproducing magnetic heads, but this method also has the disadvantage of causing track misalignment due to the azimuth angle between the recording and reproducing magnetic heads. .

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-element magnetic head that integrates erasing, recording, and reproducing magnetic heads, which eliminates the drawbacks of the prior art described above and realizes a reciprocating azimuth recording method that does not reduce recording density. It is in.

[Summary of the invention]

A feature of the present invention is that the number of tracks of at least two of the integrated erasing, recording, and reproducing magnetic heads is at least two more than the number of tracks on the recording medium. This means that the distance between the erasing and recording magnetic heads and the distance between the recording and erasing magnetic heads are added to predetermined values based on the track pitch (P) and the azimuth angle (θ).

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a recording magnetic hectare 1 for explaining the present invention in detail.
FIG. 2 is a plan view of a multi-element magnetic head in which a magnetic head 2 and a reproducing magnetic head 2 are integrated. 1 corresponds to the recording magnetic head, 2 corresponds to the reproducing magnetic head, and a, b, c, d, e, f correspond to each magnetic helium cap (or track). The recording magnetic head 1 is a thin film inductive head using a thin film forming process, and the reproducing magnetic head 2 is a magnetoresistive magnetic head using the same process. The number of tracks of the recording magnetic head 1 is 4 tracks, c, d, and e, and the number of tracks of the writing head 2 is aib,
There are 6 tracks, which is 2 tracks more than the number of tracks in the magnetic head 1 for recording c, d, e, and f, and the track pitch P
1. The two air blowing heads 1 and 2 are configured so that the distance between the gap surfaces is equal to one another.

Further, the track width of the recording magnetic head 1 is half the track pitch P.

Next, the principle of operation of the reciprocating azimuth system will be explained. FIG. 3 is an explanatory diagram of one-way (outbound) azimuth recording on the magnetic tape 3 using a multi-element magnetic head. In this configuration, the relationship A=P@tanθ holds between the azimuth angle θ, the track pitch P, and the gap surface spacing A of both magnetic heads 1.2, so that the integrated multi-element magnetic By tilting the head by an azimuth angle θ with respect to the running direction of the magnetic tape 3 using a mechanical adjustment means, the track b l C1d of the recording magnetic head 1 is adjusted.
tracks a, b, c', of the reproducing magnetic head 2 on l e;
d can be handled without any track error.

At this time, if a means for detecting that it is the outward path 1 is provided, the recorded signal can be faithfully reproduced by switching and controlling the connection between the tracks of the reproducing magnetic head 2 and the reproducing circuit so that the tracks correspond. can be played. The tracks recorded at the azimuth angle θ on the outward path are b', e', d', and e' in FIG.

Next, the operating principle for the return trip will be explained. For the return trip, various methods are possible.

In the first method, as shown in FIG. 4, when the magnetic tape 3 reaches the end point of the forward path, the magnetic tape 3 is rewound and recorded at an opposite azimuth angle θ from the starting point. In this method, by setting a reverse azimuth angle θ and using the same operating means as in the above-mentioned outward path, tracks b, c, d, and e of the recording magnetic head 1 and tracks C1dl el f of the reproducing magnetic head 2 are % Tracks can be edited without any problems, and faithful recording and playback can be achieved. In the second method, as shown in FIG. 5, when the magnetic tape reaches the end point of the forward path, the magnetic tape is run in the opposite direction 4 on the return path. When it is determined that it is the return trip, the multi-element magnetic head of this embodiment is rotated (180°-20).
By rotating the magnetic head by 300 degrees, recording can be performed at a reverse azimuth angle θ, and tracks e and d of the recording magnetic head can be recorded.

c, b and tracks f, e of the reproducing magnetic head.

Since d and c correspond, faithful recording and reproduction is possible.

The third method, as shown in Figure 6, is to remove the magnetic tape from the tape running mechanism when it reaches the end of its outward path and reinsert it into the tape running mechanism with the magnetic tape upside down. After mounting, the magnetic tape is run again in the same direction as the outward path. At this time, reverse azimuth recording can be performed by rotating the multi-element magnetic head of this configuration in the opposite direction by 20 degrees, and the recording magnetic head 1 tracks b
, c, d, e and tracks c, d, of the reproducing magnetic head 2.
Since e and f correspond, faithful recording and reproduction is possible.

In a multi-element magnetic head configured in this manner, overwriting is a prerequisite for recording. In order to reliably erase the old signal that has already been recorded and record/reproduce it, a magnetic head for erasing is required.

FIG. 7 shows an embodiment of the present invention in which erasing, recording, and recording magnetic heads are integrated using the principles of the present invention described above. 5 is an erasing head, and the gap distance between the erasing and recording magnetic heads is B, and the value of B is B==P@tanθ. The number of tracks of the recording magnetic head 1 is 4, which is 2 tracks less than the 6 tracks of the other reproducing and erasing magnetic heads. 7th
In contrast to the outward route shown in the figure, FIG. 8 shows an example of the backward route of this embodiment.

In either case, there is no track deviation due to the azimuth angle of the erasing, recording, and reproducing magnetic heads, and recording and reproduction can be performed after reliable erasing.

By performing reciprocating azimuth recording using a multi-element magnetic head with the above configuration, it is possible to prevent the decrease in recording density caused by the card band G, which was seen in the past, and also to avoid the drawback of the two-head system. FA wall alignment mechanism Problem 46: There are two sets of complicated azimuth angle adjustment mechanisms, and the problem of track misalignment between the recording magnetic head 1 and the reproducing magnetic head 2 can be solved.

In this embodiment, the number of tracks of the recording magnetic head is 4, but it is also possible to have 4 or more tracks.
Although we have taken up an example in which the number of tracks of the erasing and reproducing aperture heads is two more than the number of tracks of the recording magnetic head, the effects of the present invention do not change at all even if the number of tracks is two or more. Although a magnetoresistive head is used as the reproducing magnetic head 2, the effect of this special edition remains the same even if a bulk reproducing head with a short magnetic cap length is used.

Furthermore, even if the track width of the reproducing magnetic head 2 is larger than the track width of the recording magnetic head 1, fringing due to the adjoining track force can be prevented due to the radial mass effect, so that the magnetic recording characteristics are not deteriorated. Needless to say, there is no such thing. Furthermore, the effects of the present invention remain even in a configuration in which the number of tracks of at least two of the magnetic heads for erasing, recording, and reproduction is two or more more than the desired number of tracks of the recording medium. That is self-evident.

〔Effect of the invention〕

According to the present invention, the number of tracks of at least two of the erasing, recording, and reproducing magnetic heads is two or more tracks greater than the desired number of tracks of the recording medium. By separating the magnetic heads and the recording and reproducing magnetic heads by a predetermined distance and integrating them, a multi-element magnetic head capable of reciprocating azimuth recording and reproducing can be obtained.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional multi-element magnetic head, and FIG. 2 is a plan view of a multi-element magnetic head for explaining the operation of the present invention.
FIG. 3 is an explanatory diagram of azimuth recording on the outward path, FIGS. 4, 5, and 6 are explanatory diagrams of azimuth recording on the return path, and FIG. 7 is a diagram of the outgoing path of the multi-element magnetic head according to the embodiment of the present invention. FIG. 8 is also a return trip map. 1...Magnetic head for recording 2...Magnetic head for reproduction 3...Magnetic tape 5...Magnetic spatula for erasing 1
．． Yo sheep l Zuto 2 Figure sheep y Figure 86 eyes

Claims (1)

[Claims] 1. Multi-track erasing magnetic head, recording magnetic head.
In a magnetic head that integrates a magnetic head and a magnetic head for reproduction, the number of tracks of at least two of the magnetic heads for erasing, recording, and reproduction, or the number of tracks of the recording medium. A multi-element magnetic head characterized by having two or more tracks. 2. The track pitch (P) of the magnetic head for erasing, dC recording ε and erasing, the azimuth angle (θ) formed between the running direction of the recording medium and the gap surface of the magnetic head, and the magnetic helad for recording and reproduction. It is configured so that the following equation holds between the gap surface spacing (A), and A = 1"J IIP ・tanθ ・(1)(
N=1.2,3. ...) 7 ") Gap distance between recording and recording magnetic heads (B)
BwL e P a tanθ ・(2)(Lmaro1
, 2, 3. ...) A multi-element magnetic head according to claim 1, characterized in that: 3.Track of magnetic head for recording and erasing
(T) is half the track pitch (P).
A multi-element magnetic head according to claim 1 or 2.