JPH04170711A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce spacing of a read/write gap and an erase gap from a medium without causing stick/slip and thereby to prevent lowering of a magnetic characteristic by a construction wherein the width of an air groove of a slider constructing a magnetic head is made larger on the medium outflow end side than on the medium inflow end side. CONSTITUTION:A magnetic core 1 having a read/write gap 4 and an erase gap 5 on the upper side is held from the opposite lateral sides by using two sliders 2 and 3. On the upper side of the slider 2, an air groove 6 is provided for preventing that the magnetic core 1 is separated from a medium 24 by the air getting in between a core slider assembly 8 and the medium 24 the assembly and the medium come into contact with each other and that a magnetic characteristic is thereby lowered. On the occasion, the width of the air groove 6 is made larger as shown by (a) on the medium outflow end 9 side than the width (b) thereof on the inflow end 10 side, and the air pressure in the groove 6 is made smaller on the outflow end 9 side than on the inflow end 10 side. At the same time, spacing of the gaps 4 and 5 from the medium 24 is also made smaller at the outflow end 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and particularly to a magnetic head used in a floppy disk device.

[Conventional technology]

FIG. 3 is a perspective view showing a core slider assembly of an example of a magnetic head of a conventional floppy disk device, and FIG. 4(a)
and (b) are side views showing different states of contact between the core slider assembly and the medium of the example of FIG. 3;

As shown in FIG. 3, in the core slider assembly of the magnetic head of a conventional floppy disk device, a magnetic core 11 having a read/write gap 14 and an erase gap 15 on its upper surface is inserted into two sliders 12 and 13 from both sides.
It is configured to be held between the two. When the core slider assembly 18 and the medium 24 (see FIG. 4) come into contact with each other on the upper surface of the slider 12, air enters between them, causing the magnetic core 11 to separate from the medium 24, thereby reducing the magnetic properties. In order to prevent this, an air groove 16 is provided. The width of this air groove 16 is constant, and the width on the medium inflow end 20 side and the width on the medium outflow end 19 side are equal.

[Problem to be solved by the invention]

As described above, in the conventional magnetic head, since the width of the air groove provided on the top surface of the slider is constant, the pressure caused by the air in the air groove is constant. Therefore, as shown in FIG. 4(a), the distance between the core slider assembly 18 and the medium 24 is constant, and as this distance increases, the magnetic core 11
There is a disadvantage that the magnetic properties are deteriorated because the magnetic field is separated from the medium 24. In order to improve this, by applying a load to the core slider assembly 18 or increasing the width of the air groove 16, the air pressure is reduced and the distance between the core slider assembly 18 and the medium 24 is reduced. Fourth
As shown in Figure (b), the core slider assembly 18 is tilted due to variations in the assembled state, and the medium inflow end 20 (the direction of movement of the medium is in the direction of arrow A) comes into contact with the medium 24,
In this state, after the medium 24 rotates by a small angle, the medium inlet end 20 separates from the medium 24. If this operation is repeated, abnormal vibrations occur in the core slider assembly 18 (this phenomenon is referred to as stick slip), resulting in a problem of deterioration of magnetic recording and reproduction characteristics.

[Means to solve the problem]

The magnetic head of the present invention includes a magnetic core having a read/write gap and an erase gap, two sliders that sandwich the correction magnetic core from both sides, and a top surface of one of the two sliders. In the magnetic head including a core slider assembly having an air groove provided therein, the width of the air groove on the medium inflow end side of the core slider assembly is made larger than the width on the medium outflow end side.

〔Example〕

Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
FIG. 3 is a side view showing the state of contact between the core slider assembly and the medium in the illustrated embodiment;

In FIG. 1, a magnetic core 1 having a read/write gap 4 and an erase gap 5 on the upper surface is viewed from both sides.
The structure is such that it is held between two sliders 2 and 3.

A core slider assembly 8 and a medium 2 are provided on the top surface of the slider 2.
The air groove 6 is provided in order to prevent the magnetic properties from being deteriorated due to the separation of the magnetic core 1 from the medium 24 due to air entering between them when they come into contact with each other (see FIG. 2).

The width a of the air groove 6 on the medium outlet end 9 side is larger than the width a on the medium inlet end 10 side. Therefore, the pressure of the air in the air groove 6 is such that the pressure at the medium outflow end 9Ws is smaller than the pressure at the medium inflow end Lofs, and the distance between the core slider assembly 8 and the medium 24 is adjusted as shown in FIG. In other words, it is small when the medium outlet end 9 is open, and becomes large when the medium inflow end 10 side is open.

Read/write gap 4 provided on the top surface of the magnetic core 1
The distance between the erase gap 5 and the medium 24 is also smaller than the distance at the medium inflow end 10. Further, at the medium inflow end 10, a core slider assembly 8
Since there is always a gap between the media 24 and the media 24, stick-slip never occurs.

〔Effect of the invention〕

As explained above, the magnetic head of the present invention is capable of reading and writing without causing stick-slip by making the width of the air groove of the slider larger on the media outlet end side than on the media inflow @ side. This has the effect that the gap and the distance between the erase gap and the medium can be reduced, and deterioration of magnetic properties can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
FIG. 3 is a perspective view showing an example of a conventional magnetic head, and FIGS. FIG. 3 is a side view illustrating different contact conditions between an example core slider assembly and media; In the figure, ■・11... Core, 2, 3, 12, 13...-
・・・-Slider, 4・14・・・Read/write gap, 5・15・・・Erase gap, 6・
16... Air groove, 8, 18... Core slider assembly, 9, 19... Medium outlet end, 1
0.20...Medium inflow end, 24...Medium.

Claims (1)

[Claims] A core slider having a magnetic core having a read/write gap and an erase gap, two sliders that sandwich the magnetic core from both sides, and an air groove provided on the upper surface of one of the two sliders. A magnetic head comprising a magnetic head assembly, characterized in that the width of the air groove on the medium inflow end side of the core slider assembly is larger than the width on the medium outflow end side.