JPS6070567A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To improve the reliability of a small-sized magnetic disc device by using a floating height and the difference of contact state between a disc and a head when the mounting state of any magnetic head is changed in the most inner periphery (where the floating height is minimized) of the magnetic disc device. CONSTITUTION:The magnetic disc device consisting of a magnetic recording medium and a CSS type magnetic head fitted to a rotary arm is constituted so that an inflow end 7 of a core slider of the head is turned to the inner peripheral side when the magnetic head 2 is located on the most inner periphery where the turning speed is reduced to the most lowest level at the driving of the magnetic head 2 on the magnetic recording medium. Said constitution makes it possible to keep satisfactorily the contact state between the magnetic recording medium and the magnetic head of the small-sized magnetic disc device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic disk drive device, and in particular to improvements in the mounting arrangement of a magnetic head as the diameter of a magnetic recording medium is reduced.

[Prior art and problems]

In general, magnetic recording media and C, sr s, (contact start/stop) attached to a rotating arm are used.
In a magnetic disk device configured with a 3-shaped head, the flying characteristic of the head is such that the flying height for the same circumferential speed is the highest when the inlet end direction (longitudinal direction of the core) of the magnetic Rad slider overlaps the tangential direction of the medium. becomes larger. If the head slider is tilted at the same angle toward the inner or outer circumference of the disk from this state, and if the tilt angle is small, the flying height of the head will be greater than that in the tangential direction, regardless of which side the head slider is tilted to. becomes smaller. Conventionally, magnetic recording media with an inner diameter of 100φ or more,
In magnetic disk drives using such large magnetic recording media, there is no need to pay special attention to the angle of the core slider with respect to the tangential direction of the disk.

disk devices have come into use, and in such small magnetic disk devices, υ depends on the mounting state of the head.
, the flying characteristics during C8S and the flying characteristics during rotation are affected, and problems such as head crashes occur that do not affect the reliability of the device.

[Purpose of the invention]

In view of the problems of the prior art described above, the object of the present invention is to
By utilizing the difference in the flying height and the contact state between the disk and the head when changing the mounting state of the magnetic head at the innermost circumference (the position where the floating bone is the smallest) in a small magnetic disk device. Another object of the present invention is to provide a magnetic disk device in which the mounting position of the head is determined so as to increase the reliability of the device.

[Structure of the invention]

In order to achieve the above object, the present invention provides a magnetic disk drive comprising a magnetic recording medium and a C8S type magnetic head attached to a rotating arm, in which the magnetic head is driven on the magnetic recording medium. Provided is a magnetic disk drive, characterized in that the slider inlet end of the magnetic head is located on the inner circumferential side of the magnetic recording medium when the head is at a position where the flying height of the head is the smallest. be done.

[Embodiments of the invention]

Before explaining the present invention in detail, the relationship between the mounting state of the magnetic head and the flying characteristics in a magnetic disk drive will be explained. FIG. 1 shows the state of a magnetic head placed on a magnetic recording medium. In FIG. 1, 1 is the rotation center of the magnetic recording medium, 2 is the magnetic head, 3 is the rotation direction of the magnetic recording medium, and 4 is the tangential direction of the magnetic recording medium. As shown in FIG. 1, the state in which the tangent 4 of the magnetic recording medium and the longitudinal direction of the core slider of the magnetic head overlap is defined by the angle YA (YawAn).
gle)=O°. Also, when the inflow end of the core slider faces toward the inner circumference (rotation center side), the argument YA is negative, and conversely, when the inflow end of the core slider points toward the outer circumference, the argument YA is negative. Assume that it is positive.

The relationship between the declination angle YA and the flying height of the magnetic head is shown in FIG. The flying height of the magnetic head is maximum when YA=0°, and the flying height decreases as the declination angle YA shifts toward the negative or positive side. The side shown in FIG. 2 is the recording medium position: R33.
, rotation speed: 3600 rpm. In FIG. 2, when comparing the case where YA=-15° and the case where YA=+15°, the reduction in flying height is smaller in the case where YA=-15°. Next, let the case of YA=O'O be A, the case of YA=-15° as B, and the case of YA=+15° as C, and calculate the rotational speed of the magnetic recording medium and the contact between the magnetic head and the magnetic recording medium for each case. Indicates the relationship with the state. Figure 3 (4) is A
This is a measurement result of the contact state using an E (Acoustic Emergence) element, and the contact start points of AS B and C are indicated by A', B', and C'. Further, FIG. 3(B) shows the relationship between the rotation speed and the flying height. Figure 3 (4
) and (B), there is a large difference in the contact state between case B and case C, and state B is more desirable in order to obtain reliability of the device.

An embodiment of a magnetic disk device according to the present invention is shown in FIG. In the magnetic disk device shown in FIG. 4, when the magnetic head 2 is located on the innermost circumference 5 where the rotational speed is the lowest, the inflow end 7 of the core slider of the head is configured to face the inner circumference side. . Note that in FIG. 4, 6 indicates the outermost circumference of the magnetic recording medium. By configuring it like this,
Good contact between the magnetic recording medium and the magnetic head in a small magnetic disk device can be maintained.

〔Effect of the invention〕

According to the present invention, by appropriately selecting the mounting state of the magnetic head in a small magnetic disk device, the reliability of the device can be improved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the general configuration of a magnetic disk device. FIG. 2 is a diagram showing the flying characteristics of the magnetic head of the magnetic disk device. FIGS. A diagram showing the relationship between the number of rotations and the contact state. FIG. 4 is a diagram showing a magnetic disk device as an embodiment of the present invention. (Explanation of symbols) 1...Rotation center, 2...Magnetic head, 3...Rotation direction, 4...Tangential direction, 5...Innermost circumference, 6...Outermost circumference, 7... ...The inflow end of the magnetic field. Figure 1: Declination angle ('/aw Angi'e) Figure 3

Claims (1)

[Claims] In a magnetic disk drive configured by a magnetic recording medium and a C8S type magnet attached to a rotary arm, when driving the magnetic head over the magnetic recording medium, the flying height of the head is the highest. 1. A magnetic disk drive, characterized in that a slider inlet end of the magnetic head is located on the inner circumferential side of the magnetic recording medium when the magnetic head is at a position where the magnetic head becomes smaller.