JPH05128772A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To stabilize the levitating operation on the magnetic disk of a slider by effectively relieving the adverse influence by a difference in the coefft. of thermal expansion between a slider and a gimbal spring. CONSTITUTION:The magnetic disk device has the slider 2 which reads out and writes information and a slider supporting mechanism 1 which impresses the specified pressing force toward the magnetic disk side on this slider 2. The slider supporting mechanism 1 has the gimbal spring 3 for supporting the slider 2 at one end and a load spring 4 for supporting the other end of the gimbal spring 3. The slider 2 is adhered and fixed to the gimbal spring 3 by an adhesive 6 and an adhesive having >=40% elongation rate is also used as the adhesive 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device having an improved fixing method for a magnetic head slider and a magnetic head slider supporting mechanism.

[0002]

2. Description of the Related Art A magnetic disk device contains a magnetic disk medium and a magnetic head, and the magnetic head writes / reads information to / from a magnetic disk medium rotating at a high speed. The magnetic head is typically 0.2μ from the magnetic disk medium.
It takes the form of a magnetic head slider that floats while maintaining a minute gap (flying height) of m or less. The magnetic disk device is in the direction of higher density and larger capacity, and accordingly, the flying height is being further narrowed. In order to stably maintain such a small flying height, it is necessary to maintain the magnetic disk medium facing surface (floating surface) of the magnetic head slider as a highly accurate flat surface. Therefore, the air bearing surface of the magnetic head slider is finished by precise lapping.

A typical magnetic head assembly using such a magnetic head slider supports the magnetic head slider using a magnetic head slider support mechanism composed of a gimbal spring, a load spring and a spacer, and A predetermined load is applied to the magnetic disk medium.

Conventionally, this type of magnetic head assembly uses an adhesive having an elongation of 40% or less for fixing the magnetic head slider and the gimbal spring, and the adhesive is dried at a temperature of 80 ° C. or more. Then, the method of curing was adopted.

[0005]

In the above conventional example,
When the adhesive that bonds the magnetic head slider and the gimbal spring to fix the magnetic head slider to the gimbal spring is cured, bending stress is applied to the magnetic head slider because the thermal expansion coefficient of the magnetic head slider differs from that of the gimbal spring. Occur. In the conventional magnetic head assembly, the adhesive that bonds the magnetic head slider and the gimbal spring is cured at a high temperature of 80 ° C. or higher.
Therefore, the bending stress was large. Further, since the adhesive in the above-mentioned conventional example has a small elongation rate of 30% or less, it cannot absorb this bending stress, and there is a problem that the shape of the air bearing surface of the magnetic head slider is deformed. It was

Therefore, in the magnetic disk device using the conventional magnetic head assembly, a minute gap between the magnetic disk medium rotating at a high speed and the magnetic head slider floating above it cannot be stably maintained, and the magnetic disk cannot be maintained. There is a disadvantage that the reliability of the device is poor.

[0007]

It is an object of the present invention to improve the disadvantages of the conventional example, and in particular, to effectively mitigate the adverse effects due to the difference in the coefficient of thermal expansion between the slider and the gimbal spring, thereby stabilizing the floating operation of the slider on the magnetic disk. It is an object of the present invention to provide a magnetic disk device aiming at the above.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a slider which is arranged so as to face a magnetic disk and which reads and writes information, and a slider which supports the slider and which has a constant pressing force toward the magnetic disk, are provided. A slider supporting mechanism for applying a magnetic field to the slider, wherein the slider supporting mechanism includes a gimbal spring supporting one end of the slider and a load spring supporting the other end of the gimbal spring. The spring is adhered and fixed to the spring with an adhesive, and an adhesive having an elongation rate of 40% or more is used. This aims to achieve the above-mentioned object.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, the same reference numerals are used for the same constituent members as those in the conventional example described above. The embodiment shown in FIGS. 1 to 3 is a slider 2 serving as a magnetic head slider which is arranged so as to face a magnetic disk 8 and reads and writes information, and the slider 2.
And a slider supporting mechanism 1 for supporting the slider 2 and applying a constant pressing force toward the magnetic disk 8 side. The slider supporting mechanism 1 supports the slider 2 at one end and the gimbal spring 3 and the gimbal spring. 3 and a load spring 4 that supports the other end of the load spring 3. The slider 2 is fixed to the gimbal spring 3 with an adhesive 6. The adhesive 6 has an elongation of 40% or more. In this case, the slider 2 and the gimbal spring 3 have a relatively low temperature (70
What has been subjected to the bonding process in an atmosphere of about (° C.) Is used.

This will be described in more detail. First, the magnetic head assembly will be described. The magnetic head assembly according to the present embodiment is a magnetic head slider 2 and a magnetic head slider which float on a magnetic disk medium rotating at high speed by a principle of a dynamic pressure type air bearing with a minute gap therebetween to read / write information. It is composed of the support mechanism 1.

This magnetic head slider support mechanism 1 has a gimbal spring 3 for mounting the magnetic head slider 2 at one end, and is mounted on a magnetic head arm and a load spring 4 for applying a predetermined load to the magnetic disk medium. And a spacer 5 having rigidity that is coupled to the load spring 4. To fix the gimbal spring 3 of the magnetic head slider support mechanism 1 to the magnetic head slider 2, an adhesive 6 having an elongation rate of 40% or more is used and drying is performed at a temperature of 70 ° C. or less.

As a result, the bending stress caused by the difference in the coefficient of thermal expansion between the magnetic head slider 2 and the gimbal spring 3 can be relaxed and the deformation of the air bearing surface of the magnetic head slider 2 can be prevented.

Next, an embodiment of a magnetic disk device using the magnetic head assembly 1 according to the above embodiment will be described with reference to FIG. The magnetic disk device shown in FIG. 3 has one spindle motor (not shown) on the base 7.
A magnetic head arm 1 in which two magnetic disk media 8 are stacked on each other and fixed by a disk clamp 9 and mounted.
Four magnetic head assemblies 11 of the present invention are mounted at the tip of 0 corresponding to the storage surface of the magnetic disk medium 8. These magnetic head assemblies 11 are mounted on the magnetic head arm 10. The magnetic head arm 10 is attached to a carriage 13 and also has a voice coil motor 12
It is connected to the. The magnetic head assembly 11 is driven by the voice coil motor 12 and moves in an arc shape on the surface of the magnetic disk medium 8 around the fixed axis of the carriage 13 to position it on a designated track of the magnetic disk medium 8. Then, writing / reading of information is performed.

In this magnetic disk device, the flying height of the magnetic head slider 2 mounted on the magnetic head assembly 11 is set to 0.12 [μm]. Since the magnetic head slider 2 and the gimbal spring 3 of the magnetic head assembly 11 are bonded to each other with an adhesive having an elongation rate of 50% or more as described above, the air bearing surface of the magnetic head slider 2 is a flat surface during processing. Precision is maintained after assembly. Therefore, the above 0.
It is possible to stably fly even at a low flying height of 12 [μm]. As described above, the magnetic disk device of the present invention uses the magnetic head assembly in which the magnetic head slider and the gimbal spring are bonded by an adhesive having an elongation rate of 40% or more, thereby ensuring stable flying and high reliability. Can be maintained.

[0015]

Since the present invention is constructed and functions as described above, according to the present invention, an adhesive having an elongation rate of 40% or more used for fixing the magnetic head slider and the gimbal spring of the magnetic head slider support mechanism to each other. Due to the action of the agent, the bending stress on the magnetic head slider, which occurs due to the different thermal expansion coefficients of the magnetic head slider and the gimbal spring, can be relaxed and deformation of the air bearing surface shape of the magnetic head slider can be prevented. It is possible to provide an unprecedented and highly reliable magnetic disk device in which the minute gap between the magnetic disk medium rotating at and the magnetic head slider flying above it can be stably maintained.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a magnetic head assembly forming a part of this embodiment.

FIG. 2 is a front view of FIG.

FIG. 3 is an enlarged partial plan view showing a slider portion in FIG.

FIG. 4 is a front view of FIG.

FIG. 5 is an overall perspective view of a magnetic disk device showing an embodiment of the present invention.

[Explanation of symbols]

 1 Magnetic Head Slider Support Mechanism 2 Slider as a Magnetic Head Slider 3 Gimbal Spring 4 Load Spring 5 Spacer 6 Adhesive 8 Magnetic Disk 10 Magnetic Head Arm 11 Magnetic Head Assembly

Claims (3)

[Claims] 1. A slider provided to face a magnetic disk for reading and writing information, and a slider support mechanism for supporting the slider and applying a constant pressing force toward the magnetic disk to the slider. In this magnetic disk device, the slider support mechanism includes a gimbal spring that supports the slider at one end and a load spring that supports the other end of the gimbal spring. The adhesive has an elongation of 40
% Or more are used in the magnetic disk device. 2. The magnetic disk drive according to claim 1, wherein the slider and the gimbal spring are used after being subjected to a bonding process in a relatively low temperature atmosphere. 3. The magnetic disk drive according to claim 2, wherein the temperature in the atmosphere in the bonding step is set to about 70 ° C. or lower.