JPH05307720A - Evaluation method for floating magnetic head device - Google Patents

Abstract

PURPOSE:To evaluate the stable and high reproductivity without any damage of a disk by a lifter of a thin side member at all and under alleviation of degree of collision between the magnetic head and the disk. CONSTITUTION:This is to evaluate dynamic characteristic performance of such a floating magnetic head device 10 that a magnetic head having a magnetic head core 2 for recording and reproducing a magnetic to/from recording medium is fitted with a suspension 3 as a supporting body. The floating magnetic head 10 under the state of being attracted by an attracting means 5 from an upper part of the suspension 3 is carried to be above the rotating disk 4, and this attraction is canceled, and then the dynamic characteristic performance is evaluated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for evaluating a floating magnetic head device used in a magnetic disk drive device, and more particularly to an evaluation method for stably raising and lowering a magnetic head with respect to a magnetic disk for evaluation.

[0002]

2. Description of the Related Art In recent years, magnetic disk drive devices have been rapidly reduced in size and thickness. In order to achieve the reduction in size and thickness, in a flying magnetic head device, the outer shape of a slider forming a magnetic head is used. It is necessary to make the dimensions smaller and thinner, and to make the suspension, which is a supporter, smaller and thinner. In addition, it is necessary to reduce the diameter and thickness of the magnetic recording medium and to reduce the gap between the magnetic disks when using a plurality of magnetic media.

In addition, in the floating magnetic head device, the dynamic characteristic performance evaluation of the floating magnetic head device, for example, the electromagnetic conversion characteristic, the flying height, and the flying posture, was evaluated at the end of manufacturing. The dynamic characteristic performance evaluation was performed by operating (loading) a magnetic head device on a rotating evaluation disk, for example, a magnetic disk or a glass disk.

FIG. 2 is a diagram showing a state in which the magnetic head device 10 is carried onto a disk during conventional evaluation.

In the figure, 1 is a slider, 2 is a magnetic head core, 3 is a suspension which is a support, 4 is an evaluation disk, and a magnetic head for recording / reproducing on / from a magnetic recording medium is constituted by the slider 1 and the magnetic head core 2. Was
Further, the suspension 3 is attached to the magnetic head to form the magnetic head device 10.

The slider 1 has a flying rail (not shown) formed on the surface facing the disk 4, and the disk 4
A core mounting groove is formed on the opposite surface of the magnetic head core 2 so that the gap portion of the magnetic head core 2 is exposed.

The magnetic head core 2 is formed by joining two ferrite core members, and is joined to the slider 1. A winding 21 is provided on the magnetic head core 2.

The suspension 3, which is a support, is attached to the surface of the slider 1 opposite to the surface facing the disk 4. The suspension 3 controls the flying posture and also has a gimbal portion 31 to which the slider 1 constituting the magnetic head is attached, a load beam portion 32 to control the flying height of the magnetic head, and a mount portion attached to the drive device. It is composed of 33.

Conventionally, a part of the evaluation device for evaluating the dynamic characteristic performance of the magnetic head device 10 includes the evaluation disk 4
And a mount portion 33 of the suspension 3 and an arm portion 41, which is a transport member for transporting the magnetic head device 10 to a predetermined position of the measurement disk 4, and an L-shaped lifter 42. ..

As a concrete evaluation method, first, the suspension 3 of the magnetic head device 10 is held on the arm portion 41, and then a part of the suspension 3, for example, the load beam portion 32 is fixed from the disk 4 side by the lifter 42. Lifted up from the surface of the disc 4 to a sufficient distance, then moved the arm portion 41 and the lifter 42 and conveyed to the measuring position of the rotating disc 4, and then rotated and translated the lifter 42. The slider 1 of the magnetic head device 10 is brought into contact with the surface of the disk 4. Then, the rotating airflow of the disk 4 acts on the flying rail of the slider 1 to generate a positive pressure, and the magnetic head device 1
The slider 1 of 0 floats above the disk 4 at a predetermined interval. In this state, the dynamic characteristic performance, that is, the electromagnetic conversion characteristic, the flying height, and the flying posture are evaluated.

After the evaluation is completed, the lifter 42 is inserted between the disk 4 and the load beam portion 32 of the suspension 3,
The magnetic head device 10 is lifted from the disk 4 and returned to a predetermined position, the rotation of the disk 4 is stopped, and the evaluation is completed.

[0012]

However, as described above, the gap between the disk 4 and the suspension 3 is narrowed due to the miniaturization of the magnetic disk drive device, the magnetic head, and the suspension. Therefore, in the evaluation device described above, the thickness of the lifter 42, which is an L-shaped or U-shaped thin side member, is further reduced, and the strength of the lifter 42 is significantly reduced.

Since the lifter 42 lifts up by supporting the load 3 to 9 g in the disc 4 direction by the load beam 32, the lifter 109 is deformed due to the decrease in strength of the lifter 42, and the lifter 42 is transported. In addition, there is a problem that the disk 4 is damaged by coming into contact with the rotating disk 4.

Further, when the lifter 42 is rotated / moved so that the slider 1 abuts on the disk 4 to release the lifted state, the slider 1 and the disk 4 suddenly contact with each other, that is, collide with each other, and the disk rotates. 4 will be damaged, and also the slider 1 will be damaged.

As a result, there is a possibility that stable dynamic characteristics and performance cannot be evaluated, or erroneous characteristics may be evaluated, and furthermore, there is a limit to reproduction and use of the evaluation disk.

The present invention has been devised in view of the above-mentioned problems, and an object thereof is to prevent the occurrence of scratches on the disk surface by the lifter and the collision between the slider and the disk when the lifted state is released by the lifter. Another object of the present invention is to provide a method for evaluating a flying magnetic head that enables stable evaluation of high reproducibility.

[0017]

According to the present invention, a floating magnetic head device having a magnetic head attached to a support is attached to a conveying member having an attachment by adsorbing the support from above by the attachment. Then, the magnetic head of the levitation magnetic head device held by the conveying member is conveyed so as to be above the rotating evaluation disk, and finally the adsorption of the levitation magnetic head device by the adsorbing means of the conveying member is performed. This is a method for evaluating a floating magnetic head device, characterized in that the dynamic characteristic performance of the floating magnetic head device is measured and evaluated by releasing the floating magnetic head device onto an evaluation disk.

[0018]

According to the above evaluation method, on a rotating magnetic disk or glass disk, the magnetic head is evaluated by loading or unloading a part of the suspension from the upper part of the suspension, that is, the opposite surface facing the disk. It is performed by evacuation or by controlling the attraction force of the magnetic force of the magnet. That is, first, the suspension is adsorbed by the adsorbing means so that the gap between the rotating disk and the magnetic head becomes sufficient, and by releasing this adsorption, the magnetic head can be lowered to the disk surface. In particular, when the adsorption is released, the adsorption force can be gradually attenuated from the upper part of the suspension, so that the magnetic head can be flexibly and horizontally lowered onto the disk, preventing the magnetic head from colliding with the disk. Therefore, it is possible to prevent damage to the magnetic head and damage to the disk surface due to collision.

Further, according to the evaluation method using this evaluation device, since the lifter of the thin side member is not used, the collision between the lifter and the disk and the contact with the load beam of the suspension, which have occurred conventionally, are caused. And so on.

As a result, stable and highly reproducible evaluation of dynamic characteristic performance becomes possible.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram for explaining an evaluation method for a floating magnetic head device according to the present invention. The same parts as in the conventional case are designated by the same reference numerals.

In the flying magnetic head device 10, a magnetic head core 2 is mounted on a slider 1 having a flying rail formed on the surface facing a disk 4, a winding 21 is further provided, and a suspension 3 for controlling the flying height and flying posture. It is attached to and configured. The magnetic head is the slider 1 and the magnetic head core 2 excluding the suspension 3.

A part of the evaluation device used in the present invention is the evaluation disk 4 and the mount portion 33 of the suspension 3.
Is held, and an arm portion 41, which is a carrying member for carrying the magnetic head device 10 to a predetermined position of the measuring disk 4, is vacuumed, or an attracting force is generated by a magnetic force by an electromagnet, and the arm portion is a carrying member. It is composed of the suction means 5 that moves in synchronization with 41.

Reference numeral 5 denotes an adsorbing means, specifically, an adsorbing nozzle by vacuuming, or an adsorbing iron core for generating a magnetic force of an electromagnet.

In the evaluation method, the attraction means 5 is provided so that the load beam 32 of the suspension 3 can be attracted from above when the slider 1 of the magnetic head device 10 is transported.

The arm portion 41 fixes the mount portion 33 of the suspension 3 and sets the slider 1 of the magnetic head at a predetermined measurement position on the disk 4, and moves simultaneously with the attraction means 5.

The magnetic head device 10 is evaluated by evaluating electromagnetic conversion characteristics, flying height, and flying attitude as dynamic characteristic performance. The electromagnetic conversion characteristics are evaluated by recording and reproducing using a magnetic disk for evaluation and measuring the conversion characteristics. Further, the flying height and the flying attitude are evaluated by measuring the flying clearance, attitude and the like of the slider 1 of the magnetic head using an evaluation magnetic disk or a glass disk.

As an evaluation method, first, the suspension 3 of the magnetic head device 10 is held on the arm portion 41, and the adsorption means 5 is further operated to adsorb a part of the suspension 3, for example, the load beam 32 from above. As a result, the slider 1 fixed to the gimbal 31 of the suspension 3 can be lifted up to a sufficient distance from the surface of the disk 4.

Next, while the suspension 3 is attracted by the attraction means 5, the slider 41 of the magnetic head device 10 is conveyed to the measurement position of the rotating disk 4 by the arm portion 41.

Next, the adsorption by the adsorption means 5 is released,
Switch to the released state. This switching is performed by evacuation that is generating an attraction force or by turning on the power supplied to the electromagnet. In particular, it is important to gradually release and stop the attraction force instead of releasing the attraction force at once. In this case, the suction force due to the evacuation is actually gradually attenuated even when the electromagnetic valve of the vacuum pump is closed, so that vacuum suction is extremely effective as the suction means 5. The attraction force by the magnetic force may be such that the electric power supplied to the electromagnet is gradually reduced.

As described above, by releasing the attraction, the slider 1 of the magnetic head device 10 descends toward the disk 4 so as to come into contact with the surface side of the disk 4, but the attraction force gradually decreases. Even if the slider 1 and the slider 1 collide with each other, the disk 4 and the slider 1 will not be damaged because they contact each other flexibly.

Next, a positive pressure is generated in the slider 1 of the magnetic head device 10 by the air flow generated in the rotating disk 4, and the magnetic head device 10 floats above the disk 4 with a predetermined gap. In this state, the dynamic characteristic performance is evaluated.

Upon completion of these evaluations, if necessary, the adsorption means 5 is operated again to sufficiently separate the slider 1 of the magnetic head from the disk 4, and the magnetic head device 10 is transported to the outside of the disk 4.

As described above, according to the present evaluation method, since the conventionally used lifter is completely unnecessary, problems such as breakage of the disk 4 due to the lifter can be solved at once.

Further, since the attraction can be released, that is, the attraction force can be gradually stopped, the magnetic head device 10 and the disk 4 are not violently collided with each other, and the magnetic head device 10 is thereby caused.
And the disk 4 are not damaged. Therefore, stable and highly reproducible evaluation becomes possible, and the evaluation disk 4
Extends the life of.

When a magnetic force is used as the attracting force generated from the attracting means 5, in the evaluation of electromagnetic conversion characteristics,
It is desirable to use it only for the evaluation of the flying height, considering the influence of the characteristics of the attraction force due to the magnetic force.

Further, in the above-mentioned embodiment, the description has been made by using the composite type flying magnetic head in which the slider 1 and the magnetic head core 2 are joined, but this evaluation method can be applied to various flying magnetic heads of monolithic type and thin film type. Can be used.

[0038]

According to the present invention, there is no damage to the disk due to the lifter as in the prior art, and the degree of collision between the magnetic head device and the disk is mitigated. Damage can be prevented, and as a result, stable and highly reproducible evaluation can be performed.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an evaluation method of the present invention.

FIG. 2 is a diagram for explaining a conventional evaluation method.

[Explanation of symbols]

 10 ... Levitating magnetic head 1 ... Slider 2 ... Magnetic head core 3 ... Suspension 4 ... Disk 41 ... Arm part 42 ... Lifter 5 ... Adsorption means

Claims (1)

[Claims] 1. A levitation magnetic head device having a magnetic head attached to a support is held by a carrying member having an attracting means by adsorbing the support from above by an attracting means, and then the carrying member. The magnetic head of the levitation magnetic head device is held so that the magnetic head is conveyed above the rotating evaluation disk, and finally the adsorption of the levitation magnetic head device by the adsorption means of the conveying member is released. A method for evaluating a floating magnetic head device, characterized in that the dynamic characteristic performance of the floating magnetic head device is measured by lowering it to an evaluation disk.