JPH04206012A - Multichannel thin film magnetic head and multichannel thin film magnetic head device - Google Patents

Abstract

PURPOSE:To obtain a small-sized multi-channel thin-film head having high performance by displacing and arranging each two head to the head forming layers of two layers. CONSTITUTION:The head forming layers of two layers are formed, each two head 2, 4 is formed to each head forming layer so that the track of the head 4 on one side of an upper layer is positioned at the center of the track of the two heads 2 of a lower layer and the coil of the tracks of all heads of upper and lower two layers are not superposed, and the coils of each head are disposed so as to be extended outside each two arranged head. Consequently, the spaces of the heads 2, 4 of each layer can be expanded only by size, in which guard band width is added to track width, even when azimuth recording is not conducted, and the coils having the number of turns, from which a sufficient regenerative output is acquired, can be shaped even when the track width of the heads is narrow. Accordingly, a small-sized multi-channel thin-film magnetic head having high performance can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a multichannel thin film magnetic head and a multichannel 11m magnetic head device used in digital VTRs and the like.

Conventional technology In magnetic recording and reproducing equipment that handles a large amount of information, such as digital VTRs, large amounts of information can be recorded and reproduced by methods such as increasing the relative speed between the magnetic head and the tape, or configuring the magnetic head in a multi-channel configuration to simultaneously record and reproduce multiple signals. For example, in an NTSC D2 standard digital VTR, two channels are simultaneously recorded and reproduced at a relative speed of 27 m/s.

Problems to be Solved by the Invention However, especially when a magnetic head (hereinafter simply referred to as a head) has a multi-channel configuration, when a large number of heads are mounted on one cylinder, it is difficult to adjust the height between each head. This is becoming more and more difficult as recording becomes more dense and the track width of the head becomes narrower.Therefore, thin-film magnetic heads that can create many heads at the same time are attracting attention, but as the recording track width becomes narrower. In this case, it is difficult to form adjacent heads on one plane, so they have to be divided into multiple Herad chips, making it difficult to obtain the advantage of thin film heads that can form heads with high precision on one substrate. Also, considering the case of azimuth recording, it is difficult to form heads with different azimuths on one substrate with a thin film head, so at least two chips are required.Moreover, the width occupied by the coil of the thin film head is Since it is large compared to the track width, if the track width is narrow, it is difficult to form a head every other track.Therefore, for example, for simultaneous recording/reproduction of 8 tracks, 4 head chips are required, so that heads of the same azimuth are used. On the other hand, multiple Herad chips are required, and the advantage of being able to simultaneously form many thin film heads on one substrate cannot be utilized.

The present invention is a multi-channel thin film that can record and reproduce multiple tracks in one half-fold even when the track width is extremely small, and can easily handle azimuth recording. The purpose is to provide a magnetic head.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a structure of a multi-channel thin film magnetic head by providing two head forming layers,
Each head forming layer has two layers.

The coils of each head are arranged so that the tracks of one head of the upper layer are located in the center of the tracks of the two heads of the lower layer, and the tracks of all the heads of the upper and lower layers do not overlap. The two heads are arranged so as to spread outward from each other.

In the multi-channel thin film magnetic head according to the above means, two heads are arranged in each of the upper and lower layers, and the track of one head in the upper layer is located in the center of the tracks of the two heads in the lower layer. Even in the case of azimuth recording, the spacing between the heads of each layer can be increased by the sum of the track width and the guard band width. Furthermore, the coils of each two heads in each layer are formed so as to spread outside of the two coils arranged side by side, so even if the track width of the head is narrow, sufficient reproduction can be achieved. It is possible to form a coil with a sufficient number of turns to obtain an output, and it is possible to realize a compact, high-performance multi-channel thin film magnetic head.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing the surface of the thin film head as the upper layer of the head of the present invention. On a substrate l made of crystallized glass, calcium titanate, or the like, a lower layer Lad 2 having the same structure as an upper layer Lad 4 is formed. An upper layer head 4 is formed thereon via a nonmagnetic insulating layer 3 made of quartz, alumina, or the like. In an actual head, a cover made of the same material as the substrate is adhered thereon via a nonmagnetic insulating layer, but this is omitted in FIG. The head formed in each layer consists of a lower core 5 and an upper core 7 made of an amorphous magnetic material such as sendust or CoNbZr, which are in close contact at the back gap 8 and made of quartz or the like which forms a magnetic gap at the front gap 9. are opposed to each other with a non-magnetic film interposed therebetween. A copper or aluminum coil 6 is formed interlinked with the back gap 8. The dimensions of these heads are, for example, a track width TW-6 .mu.m, a distance between the lower layer and the upper layer of 15 .mu.m, and a gap length at the front gap 9 of 0.22 .mu.m.

FIG. 2 is a diagram of the head shown in FIG. 1 viewed from the sliding surface. In this figure, the non-magnetic insulating section and the non-magnetic cover are shown as one unit. One track of the upper head 14 is located between two tracks of the lower head 12. Therefore, when the head of each layer has a guard band as shown in Figure 2, the distance HD between the heads is HD-) rack width + guard band width x 2, and if the guard band width is 2 μm, the HD is 10 μm. 9 In the head of the present invention, the head formed in each layer has a structure in which a coil is formed extending outside the two henodic tips as shown in Fig. 1, so the track width of the head is very large. Even if the space is narrow, two heads can be formed side by side on the same plane. In addition, since each head is formed on one substrate, the track positions between each head are precisely aligned, and when the tracks of two separate head chips are used for staggering (arranging one track at a time alternately). There is no need for alignment between each Herad chip.

Next, an embodiment of a magnetic head device to which the above invention is applied will be described with reference to FIG. Figure 3 is similar to Figure 2,
The head is shown as seen from the sliding surface, and the non-magnetic parts are not distinguished as in FIG. 2.

The head chips 21 and 22, which have two heads in two layers on one substrate, a total of four heads, are close to one window of a rotating cylinder of a VTR, and each gap line has a positive and negative azimuth AZ. It is arranged like this. The respective tracks are arranged such that the height of each head chip is set so that the respective recording trajectories are staggered. In this case, the head chips 21 and 22 may be glued on one head head with adjustable height, or they may be glued on separate helad bases and mounted on cylinders with adjustable height. The head spacing in one layer of the invention is - for example, if the track width is 5 μm, then 1
The distance is 5 μm, which is sufficient to form one head. According to the head device of the present invention, compared to a case where each hent chip is individually made of a material such as ferrite, only two hent chips are required and they can be arranged close to each other, so the track height can be easily adjusted. Good accuracy.

Effects of the Invention As is clear from the above explanation, the present invention provides a high-performance multi-channel thin film head that is capable of recording and reproducing a plurality of tracks in one hendo chip even in the case of a head with a very small track width. can be made. With such a multi-channel thin film head, a plurality of heads can be arranged close to each other, so it is easier to obtain a good sliding condition between the head and the tape than when bulk-type heads are installed individually. In addition, when performing azimuth recording, eight tracks can be recorded and reproduced with two hem tips, so the track height of the head only needs to be set between adjacent hentochini, which is much faster than when using four or more thin film heads. ,
It is possible to easily and accurately install the head.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the multi-channel magnetic head of the present invention with the upper cover of the thin film head in the upper layer removed;
2 is a front view of the multichannel magnetic head shown in FIG. 1, and FIG. 3 is a front view of a multichannel thin film magnetic head device to which the multichannel magnetic head shown in FIGS. 1 and 2 is applied. 1... Board, 2... Lower head, 4...
・Song・Upper head, 5...Lower core, 6...
...Coil, 7...Upper core, 8...
・Back gap, 9...Front gap. Name of agent: Patent attorney Haruaki Ogata (2 persons) Figure 1 Figure 2 A Figure 3

Claims (2)

[Claims] (1) Consisting of two head forming layers, each head forming layer has two heads, one head track of the upper layer is installed in the center of the track of the two heads of the lower layer, and two heads are placed above and below.
A multi-channel device characterized in that the track trajectories of all heads in the layer are formed so that they do not overlap, and the coils of each head are arranged so as to spread outside of each of the two heads arranged side by side. Thin film magnetic head. (2) Two head chips with four heads formed on two layers on one substrate, two on each layer, so that their track trajectories become staggered and their gaps have positive and negative azimuths. A multi-channel thin film magnetic head device characterized by the following arrangement.