JPS5877056A - Magnetic head - Google Patents

Abstract

PURPOSE:To avoid the displacement of a magnetic converting element, by providing a member which encloses an arm containing a magnetic converting element at the tip of a flexible cantilever in order to prevent the vibrations due to the air current of the cantilever. CONSTITUTION:A supporter 2 made of a flexible cantilever member is attached to a guide arm 1 of a rigid material, and a magnetic converting element 3 is set at the tip of the supporter 2. When a disk (not shown in figure) has high-speed revolutions in the direction of an arrow 6, the element 3 floats up and at the same time balances by receiving the force going toward the disk by means of a load mechanism part 4 unified with the supporter 2 owing to a function of air dynamics produced between the disk and the converting element 3. However, the balance is lost at the resonance point of the supporter 2, and therefore the vibrations are produced. A cover member 7 is provided to enclose the support 2, and as a result the direct wind from directions a-d can be prevented to the supporter 2 and the element 3. Thus the vibrations of the supporter 2 can be avoided, and this can prevent a tracking shift of the element 3.

Description

[Detailed description of the invention] The present invention relates to a magnetic field used in a magnetic disk device.

Regarding the head.

In a magnetic disk drive, information is recorded/reproduced by bringing a magnetic transducer element of a magnetic head close to the surface of a magnetic disk that is rotating at high speed. The gap between the magnetic transducer and the magnetic disk surface needs to become narrower as the recording density increases.Currently, in order to keep the gap between the magnetic transducer and the magnetic disk surface narrow and stable, Widely adopted magnetic heads have a configuration in which the magnetic transducer is supported by a flexible cantilever member, and the magnetic transducer is lifted above the magnetic disk surface by aerodynamic action between the surface of the magnetic disk and the magnetic transducer. has been done. FIG. 1 shows such a magnetic head.

In FIG. 1, reference numeral 1 denotes a rigid guide arm, and a magnetic transducer element 3 is attached to the distal end of a support 2 whose base end is fixed to the guide arm l. The support body 2 acts as a flexible cantilever member, and is usually made of a spring material with a thickness of about .mu.m.

When the magnetic disk 5 rotates at high speed in the direction of the arrow 6, an aerodynamic action between the magnetic disk surface and the magnetic transducer 3 acts to force the magnetic converter 3 away from the magnetic disk surface. On the other hand, the magnetic transducer element 3 also receives a force directed toward the magnetic disk surface by the load mechanism section 4 provided integrally with the support body 2 . The magnetic transducer element 3 floats above the magnetic disk surface until the height at which both of these forces are balanced.

Therefore, the magnetic transducer 3 also moves up and down following the minute vertical movement of the magnetic disk surface, and the minute floating gap can be maintained stably.

Now, the above-mentioned support 2 generally has a first support near 400H2.
There is a next resonance point. Therefore, the air flow generated by the high speed rotation of the magnetic disk 5 (usually 3000 to 3600 rpm) tends to cause vibration in the support 2 in a mode shown by the broken line 8 in FIG. When this vibration occurs, the magnetic transducer element 3 moves in the direction of arrow 9 (track direction). The amount of movement in the direction of arrow 9 is usually about 2 to 4 μm.

When the width of the track on the magnetic disk was as wide as 40 μmQ, the above-mentioned displacement of the magnetic transducer 3 did not pose a serious problem. However, as the track width has recently become narrower to 301 Im or less in order to increase the recording density, the above-mentioned positional deviation cannot be ignored.

Therefore, an object of the present invention is to reduce the vibration caused by the vibration of the cantilever member in a magnetic head having a structure in which a magnetic transducer element is supported by a flexible cantilever member.

However, in view of the fact that the above-mentioned cantilever member vibrates due to wind disturbance caused by the rotation of the magnetic disk, the present invention provides a cover that surrounds the magnetic transducer element and the cantilever member that supports it. By providing the member, the vibration of the cantilever member is reduced as much as possible, thereby suppressing the displacement of the magnetic transducer element in the track direction.

FIG. 3 shows an example of a magnetic head according to the present invention.
Parts equivalent to those in the figure are given the same reference numerals.

Further, the positional relationship between the magnetic head and the magnetic disk is schematically shown in FIG.

In FIGS. 3 and 4, 7 is a newly provided cover member, which is fixed to the tip of the guide arm l. This cover 7 has four surfaces that surround the magnetic transducer element 3 and the support body 2 from the outside so that the wind from the direction of arrow 3-d does not directly hit the magnetic conversion element 3 and the support body 2. Needless to say, the cover member 7 is separated from the support body 2 and the magnetic transducer element 3. As shown in FIG. 4, the dimensions are such that it does not come into contact with the magnetic disk 5.

Now, due to the high speed rotation of the magnetic disk 5, 60rrV/
The air flow lasts for about a second, and turbulence occurs. Conventionally, the action of this turbulent flow caused one vibration of the support 2, which caused a displacement of the magnetic transducer element 3 in the track direction. However, in this embodiment, by installing the cover member 7, neither the support body 2 nor the magnetic transducer element 3 are directly exposed to the flow. As a result, Support 2
The vibration of the magnetic transducer 3 is suppressed, and the amount of displacement of the magnetic transducer 3 in the track direction is also sufficiently reduced.
, -The cover member, which is the main feature of the present invention, is
It is not necessarily limited to the shapes shown in the above embodiments. As long as the amount of displacement of the magnetic transducer in the track direction can be kept within an allowable range, it is permissible to increase or decrease the area covered by the cover member, or to make it into a semi-cylindrical shape.

As described above, according to the present invention, tran.

This makes it possible to realize a magnetic head that can be applied to magnetic disk drives with a narrow arm width, and the effect is significant.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of a conventional magnetic head, Fig. 2 is a diagram for explaining the problems of the conventional magnetic head, and Fig. 3 is a perspective view showing an embodiment of the magnetic head according to the present invention. , 4th
The figure is a diagram showing the positional relationship between the magnetic head and the magnetic disk in FIG. 3. *, 7", 15-... Magnetic disk, 7-... Cover part. - Fang 1 Figure 2 Section 3 Figure 4

Claims (1)

[Scope of Claims] A magnetic head in which a magnetic transducer element is suspended and supported from a magnetic surface by a flexible cantilever member, and a cover member surrounding the magnetic transducer element and the cantilever member is provided. A magnetic head characterized in that vibration of the cantilever member due to airflow caused by rotation of the magnetic disk is reduced.