JPS6313112A - Inductive multi-track magnetic head - Google Patents

Abstract

PURPOSE:To easily realize a multi-head track for high density processing by stacking each core of plural thin film head blocks in multi-stage and assembling them on a slider so as to be at the same position as plural track widths. CONSTITUTION:Magnetic units 3a-3c adjacent to each other at the same interval (n) as the width between prescribed tracks are formed and they are overlapped as one thin film magnetic head block 3. Since the thin film magnetic head units 3a-3c have only one core (a) and there is no limitation in number of turns of a coil (b) wound thereupon, the cores are matched with the width between optional tracks.

Description

[Detailed Description of the Invention] [Summary] An inductive multi-track magnetic head that magnetically records/reproduces data, and a magnetic storage device that uses the inductive multi-track magnetic head to record/reproduce data. In order to increase the recording density (track density), multiple magnetic heads with single-turn coils were arranged in parallel, which limited the improvement in recording density. By stacking magnetic heads in multiple stages with widths corresponding to a plurality of track positions on the surface of a data recording medium, it is possible to further improve recording density with a multi-turn inductive type multi-track magnetic head.

[Industrial application field]

The present invention relates to an inductive multi-track magnetic head that magnetically records/reproduces data.

Floating type magnetic heads are often used for magnetic disk devices used as external storage devices for information processing systems.

Broadly speaking, this floating magnetic head consists of a slider section for floating the magnetic head over a data recording medium surface with a predetermined width, and a head section consisting of a coil and a core.

On the other hand, a large number of tracks are usually set on a data recording medium, and in order to record/reproduce data on these tracks, current must be passed through the coil connected to the core at -S. Inductive type magnetic heads, which generate magnetic flux by a large amount of magnetic flux, are often used.

Conventionally, the goal of development of external storage devices for information processing systems has been how much data can be recorded in one external storage device, and to achieve this, it has been necessary to increase the trunk density on the data storage medium. This was one of the measures.

Therefore, one of the major challenges has been to realize a magnetic head that can efficiently record/reproduce data on such a data recording medium with a high track density.

[Conventional technology]

Figure 3 is a diagram explaining a conventional example, Figure 4 is a diagram explaining an example of the external configuration of a thin film magnetic head, Figure 5 is a diagram explaining the manufacturing process of a thin film magnetic head, and Figure 6 is a diagram explaining the formation of a thin film pattern. FIG. 7 is a diagram explaining the process, and FIG. 7 is a diagram explaining the data recording situation of the floating magnetic head.

FIG. 4 is a diagram showing an example of the external configuration of the thin-film magnetic head 1. This three-film magnetic head 1 receives the hydrodynamic floating blades exerted by the airflow that flows as the data recording medium rotates, and becomes magnetic. It consists of a slider section 2 for floating the radar 1 at a predetermined distance above the data recording medium surface, and a thin film magnetic hand block 3 installed on one side of the rectangle of the slider section 2.

The thin film magnetic head block 3 is composed of a core (fa) having opposing poles with a predetermined gap, and a coil (fbl) that magnetizes the opposing poles of the core (a) by passing a current to generate magnetic flux. There is.

This thin film magnetic head block 3 is used to
The method for recording/reproducing data on the disc is performed as shown in FIG. 7(A).

That is, when a recording current based on the data shown in the upper row of FIG. 7(B) is applied to the coil (b) wound around the core (a), the core ( An S pole is generated on one side of Al, and an N pole is generated on the other side, and a magnetic flux is generated between them. Magnetize as shown.

Incidentally, the lower part of FIG. 7(B) shows the reproduced signal waveform when the data recorded as described above is reproduced.

In addition, the magnetic flux density (corresponding to the magnetization level for the data recording medium (1)) passing over the data recording medium (1) surface and the magnitude of the reproduction signal are determined by the distance between the data recording medium Tl1 surface and the core Ta), It is proportional to the magnitude of the recording current.

Further, when the recording current is the same and the interval is the same, the number of turns of the coil (b) wound around the core (a) becomes approximately proportional to the number of turns.

In addition, FIGS. 7(C) to (E) show the magnetic flux density B with respect to the recording current and the state of the reproduced signal E, and the symbols d, 2 in the figure
g and δ indicate width and spacing, and symbols i and ±1 indicate current.

FIG. 5 shows the manufacturing process of the thin film magnetic head 1. As shown in FIG. First, in the first manufacturing step (11), a thin film pattern is formed on the wafer substrate +dl, and a plurality of thin film magnetic head units are fabricated based on the thin film pattern.

Next is the second manufacturing process (2) in which the plurality of thin magnetic films fabricated on the wafer substrate (al) are cut into a predetermined number of blocks.The third manufacturing process (3) is as follows:
This is the step of processing the plurality of blocks into one thin film magnetic head block 3.

In the final 40th mold manufacturing step (4), one processed thin film magnetic head block 3 is attached to a support spring (I4) to complete the thin film magnetic head 1.

Incidentally, the process of forming a thin film pattern on the wafer substrate (d) includes, for example, five steps ■ to ■, as shown in FIG.
It is formed by

That is, a conductive layer (fl) and a resist (g) are stacked on a wafer substrate (d), and the pattern Vi (bl) is exposed to ultraviolet rays to develop the pattern.

Copper (coil (corresponding to BL)) is embedded and plated in the area where the pattern has been developed by exposure to ultraviolet light (the open area in step ①).

Next, remove the copper (the first resist other than the part where the coil (corresponding to BL) is embedded) (g) and the conductive layer (f), apply the resist (g) again, and solidify it. , polish its surface. In this way, a pattern is formed and the fourth
A thin film magnetic head block 3 as shown in the figure is prepared.

[Problem that the invention seeks to solve]

In order to make the thin film magnetic head 3 produced by the above manufacturing process into an inductive multi-track magnetic head, the following method is used.

That is, as shown in FIG. 3(A), a plurality of cores (al) are installed in parallel on one thin film magnetic hend block 3.

In the case of the thin film magnetic head block 3 shown in FIG. 3(A), a plurality of cores (al) can be made to correspond to each track. However, there is a restriction on the width between the cores [81].

That is, if the track density is narrower than the width between the cores (a), it cannot be handled. Therefore, in order to accommodate this, the number of turns of the coil (bl) wound around each core (a) is restricted (for example, one turn).

On the other hand, in the case of the conventional single thin film magnetic head block 3 shown in FIG. 3(B), the number of turns of the coil (bl) is not restricted.

However, in this case, when used as a multi-track magnetic head, its control becomes complicated.

In general, the recording/reproducing level can be processed more accurately when the number of turns of the coil (b) is larger.

[Means for solving problems]

FIG. 1 shows a detailed illustration of the invention. The principle shown in FIG. A plurality of thin film magnetic head blocks 3 are created, which are shifted by a predetermined interval d so as to be stacked with a width of n. They are stacked in multiple stages so that they look like this, and then built into a slider.

[Effect]

By stacking a plurality of thin film magnetic head blocks 3 in multiple stages at a predetermined interval d in the direction of rotation of the track and having a width n corresponding to a plurality of track positions on the surface of the data recording medium, it is possible to increase the A winding inductive multi-track magnetic head can be easily realized for higher density processing.

〔Example〕

The gist of the present invention will be specifically explained below with reference to an embodiment shown in FIG.

FIG. 2 shows a detailed explanation of the present invention, and the same reference numerals indicate the same objects throughout the drawings.

The embodiment shown in FIG. 2 shows an inductive multi-track thin film magnetic head block 3 for three tracks.

In this method, adjacent thin film magnetic head blocks 3a to 3c are created with the same interval n as the width between the predetermined trunks using the same method as the manufacturing process shown in FIG. It is superimposed as .

In the case of this embodiment, the distance n between each core (a) is the width d of one thin film magnetic head unit 3a to 3c, and the width d of each thin film magnetic head unit 3a to 3c is
It is unrelated to the number of turns of l.

That is, since each thin film magnetic head unit) 3a to 3c has only one core (a), there is a coil pile to be wound there.
Since there is no restriction on the number of turns, it becomes possible to arbitrarily adjust the width between the tracks.

Furthermore, since the width d between the cores (81) is independent of the width between tracks, this can also be set arbitrarily.
This makes it possible to read data from multiple trunks at once.

〔Effect of the invention〕

According to the present invention as described above, an inductive multi-track magnetic head with multiple turns can be easily realized.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the present invention in detail, FIG. 2 is a diagram explaining the invention in detail, FIG. 3 is a diagram explaining a conventional example, and FIG. 4 is a diagram explaining an example of the external configuration of a thin film magnetic head. Figure 5 is a diagram explaining the manufacturing process of the thin film magnetic head, Figure 6 is a diagram explaining the process of forming a thin film pattern, and Figure 7 is a diagram explaining the data recording situation of the floating magnetic head. Each is shown below. In the figure, 1 is a thin film magnetic head, 2 is a slider, 3 is a thin film magnetic head block, and 3a to 3e are thin film magnetic head units, respectively. , Kiigorou/l Frochichiri achu F-pI 工U2 1st figure %? Diagram a) Blooming A row ゛ 2nd day, beginning of the month β % 3 Figure 6 ゛ lj) Shapeishi hri ka - to the positive theme! Rina's current situation i
Figure 7

Claims (1)

[Scope of Claims] An inductive multi-track magnetic head that magnetically records/reproduces data by floating at a predetermined gap with respect to the surface of a data recording medium having multi-tracks, said data recording medium. Blocks each having cores ((a)) that are magnetized by the generated magnetic flux are stacked in multiple stages on the surface, and the plurality of cores ((a)) are arranged at predetermined intervals in the direction of rotation of the track on the surface of the data recording medium. (d) and installed so as to have a width (n) corresponding to a plurality of track positions on the surface of the data recording medium, and as the data recording medium rotates. The inductive multi-track is characterized in that the thin-film magnetic head block (3) is incorporated into a slider (2) that receives the force of floating above the data recording medium surface at a predetermined interval due to an air flow flowing through the slider. magnetic head.