JPS61210511A - Thin-film magnetic head for flexible medium and magnetic storage device using magnetic head - Google Patents

Abstract

PURPOSE:To improve the state of contacting with a flexible disk without providing any guide plate and to prevent magnetic characteristics from deteriorating owing to high-speed processing by working the contacted-side edge of the protection film of an element formation part arcuately. CONSTITUTION:A magnetic head has the element formation part 1A provided to the rear edge part of the base body 1 and a magnetic head element 4 for reading and writing provided to the element formation part 1A. In this case, the corner part of the base body 1 corresponding to a surface which contacts a disk is worked arcuately. Namely, a couple of side edges R1 and R1 and the rear edge R2 of the element formation part 1A are rounded, lower edges R3 and R3are rounded, and front edges R4 and R4 of a rail arerounded. Further, those front edge parts are tapered. Therefore, when the head is used for a flexible magnetic disk, the contacting state of the contacting surface is improved and deterioration in magnetic characteristics due to high-speed processing is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an A-film magnetic head for writing to and reading from flexible media such as floppy disks, and a magnetic storage device using the same.

[Technical Background of the Invention and Problems Thereof 1 For example, a structure shown in FIG. 5 can be considered as a thin film magnetic head used for a disk (such as a floppy disk) as a flexible medium.

That is, a magnetic head element PH with a gap G is formed on the base Be, a protective film PS is formed thereon,
Further, a glass or epoxy resin GB is formed, and then a guide plate GD is formed. Here, the reason why the guide plate GO is provided is to improve the contact condition since the object to be contacted is a flexible disk, and for this reason, the surface from the guide plate GO to the substrate BB is shaped into a spherical shape. It is processed to meet the above purpose.

However, in this structure, since the guide plate Gr) is bonded, there is a problem that, for example, in the case of glass welding, magnetic properties may deteriorate due to high temperature treatment. Further, in a thin film magnetic head, the length of the magnetic head element (ball hide) can be controlled by 149, but the presence of the guide plate makes it difficult to control.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a thin film magnetic head that can improve the contact state with a flexible medium without providing a guide plate, and a magnetic head using the same. The purpose is to provide a magnetic storage device.

[Summary of the Invention 1 To achieve the above object, the present invention provides a 1111 air head in which a magnetic head element and a retention layer are formed on an element forming portion formed on an end surface of a block-shaped base. Preservation of the forming part! ! It is characterized in that the edge of the film on the contact surface side is processed into an arc shape, and it is also characterized in that it constitutes a magnetic storage device using such a magnetic head.

[Embodiments of the Invention] FIG. 1 shows a magnetic head according to the present invention, which includes a block-shaped base 1 with a rectangular cross section, an element forming portion 1Δ provided at the rear edge of the base 1, and a block-shaped base 1 having a rectangular cross section. Magnetic head element 4 for old reading provided in the forming section 1A
It has Note that 2 is an electrode section.

In addition, here, the length in the longitudinal direction of the block-shaped substrate 1 is 1.
mm or more is shown.

In the present invention, in particular, the corners of the base 1 corresponding to the contact surface with the disk are processed into an arc shape (hereinafter referred to as FR processing).

That is, the pair of side edges Rz of the element forming portion 1Δ,
Rt and the rear edge R2 are rounded, the lower edges R3 and R3 are rounded, and the leading edge R4 and Ra of the rail are rounded. Note that this front edge portion is formed in a tapered shape.

In this way, for example, a structure as shown in FIG. 3, which is a sectional view taken along line 1--2 in FIG. 1, is obtained.

In the figure, 1 is a base, on which a protection 11111+)S constituting the J-ment forming part 1A is formed,
A magnetic core IB is provided within this element forming portion 1A.

A magnetic head element P having a coil 1C is formed, and an edge R2 of the element forming portion 1A in the disk contact direction is rounded. G is a gap.

In this example, the thickness W of the protective film layer PS is 100 μm.
and the protective film PS has a Vickers hardness of 80.
It is formed of an alumina film of 0 or more. Further, the radius r of the arc-shaped portion of the edge was set to be 10 μm or more.

With the M-film magnetic head configured as above, all the corners of the contact surface of the disk except the element forming surface are removed,
Since this is processed into an arc shape, when used for flexible magnetic disks (such as floppy disks),
The contact condition on the contact surface is improved.

In the above embodiment, all the corners on the magnetic disk contact surface side are rounded, but the present invention is not limited to this configuration, and at least the corners on the magnetic disk contact surface side of the element forming portion 1A are rounded. It's fine just by itself.

A thin film magnetic head having such a structure can provide the following effects.

(1) Since no guide plate is required, the manufacturing process can be greatly simplified.

(Difficult processing such as bringing the 21 magnetic head element to the center point of spherical polishing is not required.

(3) Since the contact part with the guide plate is unnecessary, there is no need to enter and exit the contact surface during processing.

(4) Deterioration of the magnetic properties of the magnetic film does not occur due to heat treatment when contacting the guide plate.

FIG. 2 is a perspective view showing an embodiment of a magnetic storage device using the thin film magnetic head having the above structure.

This device mainly consists of a disc-shaped magnetic disk 6 rotatably placed at a rotation center 9, and a magnetic head 10 that comes into contact with the surface of the magnetic disk. The magnetic head 10 is composed of a block-shaped base 1 and a magnetic head element 4, and is arranged on a track 6A of a magnetic disk 6. The magnetic head 10 is attached to an arm 7, and the tip of the arm 7 is connected to a voice coil motor actuating device 8 in a well-known manner.

Such a magnetic storage device uses a thin-film magnetic head with a micro structure, so it is possible to increase the storage capacity on the medium surface, and it is also possible to achieve high-speed data processing even at the same rotation speed as in the past.

FIG. 4 is a sectional view showing another structure of the floppy disk. This floppy disk has a frame 1 for holding both the front and back sides.
The storage capacity is doubled by storing data on the surface of each disk. By installing magnetic heads of the present invention on the front and back surfaces of such a disk, smooth data processing can be performed.

FIG. 6 shows experimental data for investigating the state of head touch of a magnetic head on a floppy disk surface in a storage device, and is an envelope of a reproduced waveform around the disk.

If the figure (a) is according to the embodiment of the present invention, the figure (b) is
) is the case of the conventional example. It can be seen that the case of the present invention is much better. Note that the maintenance 5i of the magnetic head 10
If the ps was less than 500 Vickers hardness, the contact wear on the disk surface would be large, making it unsuitable for practical use.

Further, when the radius r of the arc-shaped portion was less than 10 μm, the elastic deformation limit of the flexible medium was exceeded, resulting in poor head touch.

[Effects of the Invention] According to the present invention described in detail above, it is possible to improve the contact state with the flexible disk without providing a guide plate.
l! A J magnetic head and a magnetic storage device using the same can be provided.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the thin film magnetic head of the present invention, FIG. 2 is a perspective view showing an example of a magnetic disk device using the above thin film magnetic head, and FIG. 3 is a perspective view showing the structure of the magnetic head. 4 is a sectional view showing another type of magnetic disk to which the present invention is applied, and FIG. 5 is a sectional view showing an example of a conventionally considered magnetic disk. FIG. 6 shows data showing the state of contact between the disk and the magnetic head, where (a) shows the case of the present invention and FIG. 6 (b) shows the conventional case. DESCRIPTION OF SYMBOLS 1... Block-shaped body, 1A... Element forming part, 4... Magnetic head element, 6... Magnetic disk, 7... Arm, 8... Actuating device, Fig. 1, Fig. 6 Figure (b)

Claims (4)

[Claims] (1) In a thin film magnetic head in which a magnetic head element and a protective film layer are formed on an element forming part formed on an end surface of a block-shaped substrate, an edge of the protective film of the element forming part on the contact surface side. A thin film magnetic head for flexible media, characterized in that it is formed by processing into an arc shape. (2) The thickness of the magnetic head element protective film layer is 100 μm.
2. The thin film magnetic head for flexible media according to claim 1, wherein the magnetic head is less than or equal to m. (3) Magnetic head element protective film has a Vickers hardness of 8
2. A thin film magnetic head for a flexible medium according to claim 1, characterized in that the thin film magnetic head is made of an alumina film of 0.00 or more. (4) In a thin film magnetic head in which a magnetic head element and a protective film layer are formed on an element forming portion formed on an end surface of a block-shaped base, the end edge of the protective film of the element forming portion on the contact surface side. A magnetic storage device using a thin-film magnetic head for flexible media formed by processing into an arc shape.