JPS59188818A - Multi-element thin film magnetic head - Google Patents

Abstract

PURPOSE:To obtain a multi-element thin film magnetic head which can increase the track density of a magnetic tape by putting a part of each of adjacent conductor coils on the width direction of a magnetic tape via an insulated layer. CONSTITUTION:Each unit magnetic head is formed on a substrate 20 made of ceramics, ferrite, etc. A protecting film 22 is formed on the substrate 20 generally by a sputtering process, and a magnetic matter 24 is provided on the film 22 by a sputtering, vapor deposition or a plating process, etc. in an optional pattern. An insulated layer 28 is formed on the matter 24 via a gap 26, and a spiral conductor coil 30 is buried into the layer 28. The adjacent conductor coils 30 and 36 are buried with a partial overlap given in the width direction of the magnetic head via the layer 28. Therefore the coil 36 is set higher than the coil 30 to the substrate 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a so-called multi-element thin film magnetic head in which a plurality of unit magnetic heads are provided according to the number of tracks on a magnetic tape.

[Background of the invention]

A magnetic head is a device that writes information on a magnetic surface such as a magnetic tape, and reads and erases the written information.Recently, in order to increase storage capacity, the number of tracks on magnetic tape has been increased. The practical application of thin-film magnetic heads as multi-element magnetic heads to meet these demands is being considered.

In addition, in this type of magnetic head, a coil is provided for each unit magnetic head so that signals for each unit magnetic head can be controlled arbitrarily. Furthermore, in order to prevent the current capacity during information recording from increasing when all the unit magnetic heads are driven* simultaneously, means are employed to increase the number of turns of the coil in each unit magnetic head.

As a method for forming such a multi-turn coil using a thin film head, two methods have been proposed: a laminated type and a planar spiral type, and the latter is often used because of the ease of the process.

A planar spiral type multi-element thin film magnetic head is shown in FIG. 1, and FIG. 2 is an enlarged cross-sectional view taken along line AA' in FIG. Each unit magnetic head consists of an independent spiral conductor coil 10, an insulating layer 12, a gap 14, a magnetic material 16, and a protective film 18 formed on a substrate 11. However, as can be seen from Figure 1, in this type of magnetic head, a certain distance is required between adjacent conductor coils/I/10, so the overall width W of the magnetic head is inevitably large. This has led to the problem that the track density of the magnetic tape cannot be increased.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its object is to provide a multi-element thin film magnetic head that can increase the track density of a magnetic tape.

[Summary of the invention]

In order to achieve the above object, in the present invention, adjacent conductor coils are partially overlapped in the width direction of the magnetic tape with an insulating layer interposed therebetween, thereby reducing the overall width of the magnetic head. This configuration makes it possible to increase the track density of the magnetic tape.

[Embodiment of the Invention] FIG. 3 is a cross-sectional plan view showing a preferred embodiment of the multi-element thin film magnetic head according to the present invention, and FIG. 4 (B) and (C)
are shown on line A-A', line B-B', and line c-c' in Figure 3, respectively.

FIG.

Each unit magnetic head is formed on a substrate 20 made of ceramic, ferrite, etc., as shown in FIG. 4(5). Board 2
A protective film 22 is generally formed on the protective film 22 by a sputtering method, and a magnetic material 24 is provided on the protective film 22. The magnetic material 24 can be formed by sputtering, vapor deposition, plating, or the like, and is patterned into an arbitrary shape.

An insulating layer 28 is formed on the magnetic body 24 with a gap 26 in between, and a spiral conductor coil 3 is formed in the insulating layer 28.
0 is embedded. The gap 26 connects the non-magnetic material to the magnetic material 2.
4 and an insulating layer 28. Insulating layer 2
The magnetic material 32 is again formed on the magnetic material 8 , and the magnetic material 62 is covered with a protective film 34 . The configuration up to this point is almost the same as the conventional product.

Next, the characteristic portion of the present invention will be explained based on FIG. 4(B). As can be seen from this figure, adjacent conductor coils 30
, 3rs are partially overlapped and buried with an insulating layer 28 in between in the width direction of the magnetic head (W in FIG. 6). Therefore, the conductor coil 36 is located above the substrate 20, as shown in FIG. 4 (q). The conductor coils 38 are also superimposed in exactly the same manner as in FIG. 4(B).

In this way, by sequentially constructing a unit magnetic head by overlapping adjacent conductor coils, the width W (FIG. 3) of the magnetic head can be significantly reduced. Along with this, it becomes possible to increase the track density on the magnetic tape (not shown) side.

Each unit magnetic head is provided with a pair of terminals 40, 42, and current is supplied to the unit magnetic head via these terminals 40, 42. As is well known, each unit magnetic head is
Writing information to each magnetic surface of a running magnetic tape,
Read or erase information.

〔Effect of the invention〕

As shown above, in the present invention, adjacent conductor coils are partially overlapped in the width direction of the magnetic tape via an insulating layer, so the overall width of the magnetic head is small, and the track density of the magnetic tape can be reduced. Can be made larger.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view showing a conventional multi-element thin film magnetic head, FIG. 2 is a cross-sectional view taken along the line A-A' in FIG. 1, and FIG. 3 is a preferred implementation of the multi-element thin film magnetic head according to the present invention. A cross-sectional plan view showing an example, FIG. 4(5). (B) and (C) are lines A-A' and B'- in Figure 3, respectively.
It is a sectional view along the B' line and the c-c' line. 20・Substrate, 24.52 Magnetic material 1.2
8... Insulating layer, 30, 36.38 Conductor coil, W. Width of magnetic head.

Claims (1)

[Claims] A multi-element device in which a unit magnetic head is a thin-film element that forms one magnetic circuit by laminating a magnetic film serving as a magnetic core, a conductor coil, an insulating layer, etc. on a substrate, and a plurality of these are arranged in parallel in the width direction of a magnetic tape. A multi-element thin film magnetic head characterized in that adjacent conductor coils are partially overlapped in the width direction of a magnetic tape with an insulating layer interposed therebetween.