JPH0644530A - Magnetic head device - Google Patents

Abstract

PURPOSE:To provide the magnetic head device with which a characteristic test and the assembly operation to a magnetic disk device are easy. CONSTITUTION:This magnetic head 1 has a magnetic conversion element on a slider. Lead wires 2 are constituted by embedding conductor films 22, 23 into a high-polymer resin film 21. These conductor films 22, 23 are connected at one end to the taking out recordings of the magnetic conversion element and are formed as free ends at the other end and have exposed conductive film parts 24, 25 exposed with the conductor films 22, 23 by notching the high- polymer resin film 21 in the intermediate part between the one end and the other end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device, and more particularly to improvement of a lead wire connected to a lead electrode of a magnetic conversion element.

[0002]

2. Description of the Related Art In a conventional magnetic head device, a lead wire connected to an extraction electrode of a magnetic conversion element is composed of a twisted pair wire, a loop is formed by the twisted pair wire, and a tip portion thereof is taken out of the magnetic conversion element. It was common to connect to electrodes. However, for example, Japanese Patent Laid-Open No. 64-217
No. 13 (US Pat. No. 4,928,195), miniaturization of the magnetic head, reduction of load applied to the magnetic head from the head supporting device, reduction of peripheral speed due to reduction in diameter of the magnetic disk, reduction of flying height, Furthermore, it is difficult to deal with the increase in the number of extraction electrodes due to the increase in the number of elements with a lead wire using a twisted pair wire. The smaller the magnetic head, the lower the load, the lower the flying height, and the lower the peripheral speed, the more easily it is affected by the spring rigidity of the loop part due to the twisted pair wire.
This is because the flying height and flying characteristics of the magnetic head are adversely affected.

In order to reduce the influence of the spring rigidity of the loop portion of the twisted pair wire, an attempt has been made to make the wire diameter of the wire about 30 μm, for example. Therefore, together with the reduction in the area of the extraction electrode due to the miniaturization of the magnetic head, there arises a problem that the work of joining the extraction electrode becomes difficult. Further, in the case of a multi-element type magnetic head, a large number of strands are present in a small space, so that the joining work is extremely troublesome.

Japanese Patent Publication No. 59-31128, Japanese Patent Publication No. 6
Japanese Patent Publication No. 0-12686 and Japanese Patent Publication No. 60-19045 disclose a technique in which a flexible lead wire having a conductor film supported by a polymer resin film is used instead of the lead wire using a twisted pair wire. Also, US Pat. No. 4,761,699 and US Pat. No. 5,001,
No. 583 and U.S. Pat. No. 5,006,946, at least a part of the head supporting device is made of a polymer resin plate such as polyimide, and a conductor film embedded in the polymer resin plate is used. A technique used as a lead wire is disclosed.

[0005]

In this type of magnetic head device, after the lead wire connection to the magnetic head is completed, a tester is connected to the free end of the lead wire to perform a characteristic test. The length of the lead wire required to lead to the tester connection position is longer than the length required when incorporated in the magnetic disk device. Therefore, the product that has passed the test is supplied to the user after cutting the lead wire so as to have a length suitable for incorporation into the magnetic disk.

However, when a flexible lead wire having a conductor film supported by a polymer resin film is used, when the lead wire is cut to have a length suitable for incorporation in a magnetic disk, the end portion of the conductor film is made of polymer resin. Since it remains buried in the fill, the polymer resin film must be removed and the conductor film hidden inside must be exposed to the outside before being incorporated in the magnetic disk device. This work is extremely troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a magnetic head device which is easy to perform a characteristic test and a magnetic disk device.

[0008]

In order to solve the above-mentioned problems, the present invention is a magnetic head device including a magnetic head and a lead wire, wherein the magnetic head has a magnetic conversion element on a slider. The lead wire is formed by embedding a conductor film in a polymer resin film, one end of the conductor film is connected to the extraction electrode of the magnetic conversion element, and the other end is a free end. And a conductor film exposed portion where the conductor film is exposed by cutting out the polymer resin film in an intermediate portion between the other end and the other end.

[0009]

Since the lead wire is formed by embedding a conductor film in a polymer resin film, the spring rigidity of the lead wire is reduced by, for example, thinning the polymer resin film to reduce the spring rigidity of the lead wire. Can be made smaller. For this reason, the magnetic head can be downsized, the load can be reduced, the flying height can be reduced, and the peripheral speed can be reduced.

Since the lead wire has the conductor film embedded in the polymer resin film, the pattern at the tip of the conductor film can be enlarged to increase the joint area and increase the joint strength to the extraction electrode. it can. Further, not only solder connection but also ultrasonic bonding technology can be used, and the bonding work becomes easy.

Since one end of the conductor film of the lead wire is connected to the extraction electrode of the magnetic conversion element and the other end is a free end, a characteristic test can be conducted by connecting a tester to the other end. Since the position of the other end can be arbitrarily set according to the length of the lead wire, no trouble occurs when performing the characteristic test.

Since the lead wire has a conductor film exposed portion where the conductor film is exposed by cutting out the polymer resin film in the intermediate portion between one end and the other end, the conductor film exposed portion is used in the magnetic disk device. It can be used as an external wiring connection part when assembled. The portion before the exposed portion of the conductor film is cut and removed.

[0013]

1 is a perspective view of a magnetic head device using a magnetic head according to the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line A2-A2 of FIG. 1, and FIG. 3 is a view of the magnetic head device shown in FIG. It is an enlarged view of a magnetic head mounting portion. Reference numeral 1 is a magnetic head, 2 is a lead wire, and 3 is a head supporting device.

The magnetic head 1 has a slider 11 and a magnetic conversion element 12. FIG. 4 is a diagram showing an example of a magnetic head. The slider 11 has a medium facing surface 111 on one side and a supporting surface 112 on the opposite side. The medium facing surface 111 of the slider 11 may have one to three rail portions, and may be a flat surface having no rail portions. The most projecting surface of the medium facing surface 111 constitutes an air bearing surface having a high surface property. The illustrated slider 111 has two rail portions 113 and 114 on the medium facing surface 111,
The surfaces of the rail portions 113 and 114 are used as air bearing surfaces.

The magnetic conversion element 12 is disposed on the side surface 115 of the slider 11 and appears to the outside of the extraction electrodes 121 and 1.
22 (see FIG. 4). The side surface 115 of the slider 11 on which the magnetic conversion element 122 is arranged is located at the end in the medium traveling direction (air outflow direction) indicated by the arrow a. The magnetic conversion element 12 may be any of a thin film magnetic conversion element, a Winchester type magnetic conversion element, or a composite type magnetic conversion element manufactured according to the same process as the IC manufacturing technique. Further, it is not limited to the magnetic conversion element prepared for in-plane recording, it may be a magnetic conversion element for perpendicular recording, or it is not limited to an inductive type magnetic conversion element, but a magnetic conversion element utilizing a magnetoresistive effect. May be. Furthermore, not only the single element type,
It may be a multi-element type.

The lead wire 2 is formed by embedding conductor films 22 and 23 in a polymer resin film 21. A typical example of the lead wire 2 of this type is a tab tape (Ta
pe Automate Bonding tape), and an example using a tab tape is shown in the examples. In the tab tape, the polymer resin film 21 is in the form of a tape, and is made of a polymer resin material having excellent electric insulation, heat resistance and flexibility, such as polyimide. The polymer resin film 21 includes a support film 211 that supports the conductor films 22 and 23 and the conductor film 2
The protective film 212 covers the second and the second films 23. The total thickness T including the polymer resin film 21 and the conductor films 22 and 23 is selected to be 100 μm or less. The conductor films 22 and 23 are directly attached to the surface of the support film 211 forming the polymer resin film 21 without an adhesive layer. The conductor films 22 and 23 are copper films and are formed by using a thin film technique such as spatter and a high precision pattern forming technique such as photolithography. The film thickness of the conductor films 22 and 23 can be set to about several μm to several tens of μm. The number of conductor films 22 and 23 shown in the figure is two, but in the case of use in a multi-element magnetic head, for example, the number is more than that. The thicknesses t1, t2, and t3 (see FIG. 2) of the support film 211, the conductor films 22 and 23, and the protective film 212 are t1 = 10 μm when the total thickness T is set to, for example, 25 μm. t2 = 5 μm, t3
= 10 μm.

In the lead wire 2, one ends of the conductor films 22 and 23 are connected to the extraction electrodes 121 and 122 of the magnetic conversion element 12. Solder joining or ultrasonic joining can be adopted as the connecting means. From the viewpoint of joining workability, ultrasonic joining is desirable.

The other end of the lead wire 2 is a free end,
The polymer resin film 2 is provided on the intermediate portion between one end and the other end.
1 has conductor film exposed portions 24 and 25 which are cut out to expose the conductor films 22 and 23. The conductor film exposed portions 24 and 25 are
Support film 211 constituting the polymer resin film 21
Alternatively, any of the protective films 212 can be formed by partially cutting out. The portions of the conductor films 22 and 23 exposed on the conductor film exposed portions 24 and 25 have solder 26,
It is desirable to attach 27 (see FIG. 2).

As described above, since the lead wire 2 has the conductor films 22 and 23 embedded in the polymer resin film 21, its spring rigidity can be improved by, for example, thinning the polymer resin film 21. It is possible to reduce the spring rigidity of the lead wire 2 as a whole. Therefore, the magnetic head 1 can be downsized, the load can be reduced, the flying height can be reduced, and the peripheral speed can be reduced.

When the tab tape is used as the lead wire 2, the conductor films 22 and 23 are directly attached to the support film 211 constituting the polymer resin film 21 without an adhesive layer, and therefore, the whole structure. It is also easy to select the thickness T of 100 μm or less which could not be achieved conventionally. For this reason, flexibility is increased, bending is facilitated, and
Bending spring rigidity decreases. Therefore, in combination with the magnetic head, the tip of the lead wire 2 may be bent to bond the conductor films 22 and 23 to the extraction electrodes 121 and 122 provided in the magnetic conversion element 12 of the magnetic head 1. In addition, the bending spring rigidity with respect to the magnetic head 1 is reduced. These functions effectively as the magnetic head becomes smaller, the load is reduced, the flying height is reduced, and the peripheral speed is reduced.

In the lead wire 2, one ends of the conductor films 22 and 23 are connected to the extraction electrodes 121 and 122 of the magnetic conversion element 12, and the other end is a free end. The test can be conducted. Since the position of the other end can be arbitrarily set according to the length of the lead wire 2, no trouble occurs during the characteristic test.

The lead wire 2 is formed by cutting out the polymer resin film 21 at an intermediate portion between one end and the other end to form the conductor film 2.
Since the conductor film exposed portions 24 and 25 are formed by exposing the conductor film exposed portions 2 and 23, the conductor film exposed portions 24 and 25 can be used as external wiring connecting portions when incorporated in a magnetic disk device. When the solders 26 and 27 are attached to the surfaces of the conductor films 22 and 23 exposed in the conductor film exposed portions 24 and 25, the external wiring can be easily soldered in the conductor film exposed portions 24 and 25 when assembled in the magnetic disk device. Can be attached. In assembling into the magnetic disk device, the portions before the conductor film exposed portions 24 and 25 are partially cut at the position XX and removed (see FIG. 1).

The head support device 3 has a fixed end E on one end side in the longitudinal direction and a free end F on the other end side, and has a flexible support portion 31 on the free end F side. 31 is attached to the support surface 112 of the slider 11. The head supporting device 3 supports the magnetic head 1 so that the magnetic head 1 can follow the surface fluctuation of a magnetic disk (not shown). Conventionally, various types of head supporting devices of this type have been proposed and put to practical use. In the illustrated head support device 3, the flexible support portion 3
Reference numeral 1 denotes a gimbal that allows a roll movement about a first axis taken in the longitudinal direction and a pitch movement about a second axis orthogonal to the first axis. The supporting surface 112 of the slider 11 that is formed is joined by means such as adhesion.

[0024]

As described above, according to the present invention, the following effects can be obtained. (A) Since the lead wire is formed by embedding a conductor film in a polymer resin film, it is possible to provide a porcelain head device capable of coping with downsizing, load reduction, flying height reduction, and peripheral speed reduction. . (B) Since the lead wire has the conductor film embedded in the polymer resin film, it has a large bonding strength to the extraction electrode,
Moreover, not only solder connection but also ultrasonic bonding technology or the like can be used, and a magnetic head device with easy bonding work can be provided. (C) In the lead wire, one end of the conductor film is connected to the extraction electrode of the magnetic conversion element, and the other end is a free end. Therefore, a characteristic test can be performed by connecting a tester to the other end. Since the position of the other end can be arbitrarily set according to the length of the lead wire, it is possible to provide a magnetic head device that does not cause any trouble during the characteristic test. (D) Since the lead wire has a conductor film exposed portion where the conductor film is exposed by cutting out the polymer resin film in the intermediate portion between one end and the other end, the conductor film exposed portion is used in the magnetic disk device. It is used as an external wiring connection part when assembled, and the part before the exposed part of the conductor film is cut and removed.
It is possible to provide a magnetic head device that can be used by adjusting the lead wire length suitable for incorporation in a magnetic disk device.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic head device using a magnetic head according to the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line A2-A2 in FIG.

FIG. 3 is an enlarged view of a magnetic head mounting portion of the magnetic head device according to the present invention shown in FIG.

FIG. 4 is a perspective view showing an example of a magnetic head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 magnetic head 11 slider 12 magnetic conversion element 121,122 extraction electrode 2 lead wire 21 polymer resin film 22,23 conductor film 3 head support device

Claims (4)

[Claims] 1. A magnetic head device including a magnetic head and a lead wire, wherein the magnetic head includes a magnetic conversion element on a slider, and the lead wire has a conductor film in a polymer resin film. The embedded conductive film has one end connected to the extraction electrode of the magnetic conversion element, the other end being a free end, and the polymer in the intermediate portion between the one end and the other end. A magnetic head device having a conductor film exposed portion in which a resin film is cut out to expose the conductor film. 2. The conductor film exposed in the conductor film exposed portion,
The magnetic head device according to claim 1, wherein solder is attached to the surface. 3. The magnetic head according to claim 1, wherein the magnetic conversion element is a thin film magnetic conversion element. 4. A head supporting device is included, wherein the head supporting device has a fixed end on one end side in the longitudinal direction and a free end on the other end side, and has a flexible support portion on the free end side. The magnetic head device according to claim 1, 2 or 3, wherein the flexible support portion is attached to the support surface of the slider.