JPS5833617B2 - floating magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a floating magnetic head that reads and writes information to a magnetic recording medium while the magnetic head is floating above the surface of the magnetic recording medium, such as a magnetic disk device or a magnetic drum device. In this regard, it is an object of the present invention to provide a mechanically robust floating magnetic head that can cope with the increase in track density of recording media.

FIG. 1A is a side view of a conventional magnetic head of this type in use, with a front gap 1 facing a magnetic recording medium 3 of a magnetic disk 2.

The first figure is a perspective view of the magnetic head seen from the front gap side, and the second figure is a sectional view of the same magnetic head taken along the gap.

This magnetic head is a monolithi
c) It is called a type magnetic head, and the slider 4 and core 5, which control floating, are made of the same ferrite.
The core 5 is fixed to the slider 4 at a front gap 1 and a back gap 6 through glass.

13 is a read/write coil.

The front gap 1 has a convex track rail 7
On both sides of the track rail 7, similarly convex slider rails 10 and 1 are provided with grooves 8 and 9 in between.
1 is provided.

At the end of each convex shape 7, 10, 11, there are inclinations 7', 10, 7 for aerodynamically floating the head.
11' is formed.

The slider 4 is supported by the Ginopal 12 and pressurized toward the disk 2 by spring pressure, but when the disk 2 rotates in the direction of the arrow, the airflow between the slider 4 and the disk 2 causes the slider to float several μm, and the front Gap 1 faces recording medium 3 via an air gap.

In this state, the coil 13 reads and writes information.

By the way, in order to increase the recording density per unit area on a recording medium, in addition to the so-called bit density in the traveling direction of the recording medium, the track density in the track width direction: IPI (
One technological effort is being made to improve Track Per Inch).

In order to enable the above-mentioned magnetic head to face a magnetic track with a width as small as possible with high precision, both edges of the track rail 7 are chamfered to form inclined surfaces 7a and 7b, and the tip surface 1c is finished flat. , the gear horn width d is obtained.

However, when both sides of the track rail are cut into a sharp shape, the mechanical strength naturally decreases, making it more susceptible to damage.

In particular, magnetic ferrite is a brittle and easily chipped material, so a slight external force during handling or operation can cause the track rail part to break off, and furthermore, fragments can become stuck between the head and the recording medium surface, causing damage to both. This may cause irreparable damage.

This kind of failure is more likely to occur in a floating magnetic head of the C85 (Contact Start Stop) type in which the magnetic head comes into contact with the disk surface when the rotation of the magnetic disk is started or stopped.

Therefore, 1. In terms of strength, it is desirable that the angle θ formed by the track rail 7 is large, but if the angle θ becomes narrower, the distance between the track rail 7 and the adjacent track of the recording medium becomes shorter, so that the angle θ between the adjacent tracks becomes smaller. Crosstalk occurs, reducing reading and writing reliability.

To prevent this, the track spacing must be increased,
This goes against increasing track density.

An object of the present invention is to solve all of these contradictory problems in floating magnetic heads at once.

In order to achieve this object distantly, the present invention provides a floating magnetic head that has a slider that controls floating and a core, and that forms a magnetic gap between the end surface of the track rail of the slider and the core. By gluing a magnetic material and a non-magnetic material together along the plane that bisects the shaped track rail part in the width direction, the magnetic material and non-magnetic material form a track rail. The core is adhered to the end surface of the track rail portion on the magnetic material side to form a gap.

FIG. 2 is a cross-sectional view showing an embodiment of the magnetic head according to the present invention, and similarly to FIG.

FIG. 3 is a plan view of the magnetic head viewed from the front gap side.

In the case of the present invention, a part of the slider has a structure in which a magnetic material 14 such as ferrite and a non-magnetic material 15 are bonded together, and a core 16 is attached to the magnetic material 14 side through gaps 1/ and 6/. It is fixed.

The boundary surface 11 between the magnetic material 14 and the non-magnetic material 15 is provided at a position that bisects the track rail 18 in its width direction.
A track rail 18 having one convex strip is formed by a track rail portion 18a made of a magnetic material and a track rail portion 18b made of a non-magnetic material.

An inclined surface 18c for determining the dimensions of the front gap 1' is formed on the magnetic track rail 18a side, but there is no slope on the non-magnetic track rail 18b side.

To read and write information with this magnetic head, the boundary surface 17 is made to correspond to one edge of the track 3a as shown in FIG.

In the conventional magnetic head, since the position 1 of the chain line is made of magnetic material, the distance S to the adjacent track 3b is short, and crosstalk during reading and writing is unavoidable.

In contrast, in the present invention, since the right side of the boundary surface 17 is the track rail 18b made of non-magnetic material, the magnetic material track rail portion 18a forming the magnetic circuit and the adjacent track 3
The distance from b increases, and the ripple a stalk during reading and writing decreases significantly.

Further, the non-magnetic track rail 18b side does not need to be sloped to have a sharp tip, and therefore has increased mechanical strength, thereby reinforcing the magnetic track rail portion 18a.

Therefore, the inclination angle θ′ of the magnetic track rail portion 18a
It is possible to further reduce the gap width d at the tip, and to increase the distance between the inclined surface 18e side and the adjacent track 30, thereby reducing crosstalk.

As described above, by forming one side of the magnetic track rail that constitutes the magnetic circuit perpendicular to the recording medium and reinforcing this side by adhering a non-magnetic material, it is possible to connect adjacent tracks on both sides. It is possible to reduce the cross-stiffness between the two, improving the reliability of reading and writing information.

Furthermore, by reducing inter-track crosstalk, it is also possible to improve track density by reducing track width and track spacing.

Even if the ferrite track rail part, which is highly magnetic but lacks brittleness, is made wide and sharp, it is reinforced with a non-magnetic track rail part and prevents head crashes, so it is especially suitable for C8S type floating type. Effective for magnetic heads.

The material of the core 16 and the magnetic part 14 of the slider is preferably a magnetic ferrite, and the non-magnetic part 15 of the slider is preferably made of non-magnetic ferrite, glass, or the like.

The magnetic body part 14 and the non-magnetic body part 15 are bonded using glass having a high melting point to prevent the glass on the boundary surface 17 from melting when bonding the core 16 and forming the gaps f and 6'.

[Brief explanation of the drawing]

Figure 1 shows a conventional floating magnetic head. Figure A is a side view in use, the opening is a perspective view seen from the front gap side, and Figure F is a sectional view taken along the gap surface. . 2 to F show an embodiment of a floating magnetic head according to the present invention, in which FIG. 2 is a sectional view taken along the gap plane, FIG. 3 is a plan view as seen from the front gap direction, and FIG. The figure is an enlarged cross-sectional view of the front gap facing the magnetic recording medium. In the figure, L1' is a front gap, 3a. 3b and 3c are storage tracks of the magnetic disk, 14 is a magnetic part of the slider, 15 is a non-magnetic part of the slider,
16v'i core, 17 is a boundary surface, 18 is a rack rail, 18a is a magnetic part of the track rail, 18b is a non-magnetic part of the track rail, and 18c is an inclined surface for dimensioning.

Claims (1)

[Claims] 1. A moving magnetic head that has a slider that controls flying and a core, and that forms a magnetic gap between the end surface of the track rail of the slider and the core. By gluing a magnetic material and a non-magnetic material together with the surface dividing the track rail section into two in the width direction, a track rail is constructed from the magnetic material and the non-magnetic material, and the magnetic material side A floating magnetic head characterized in that a gap is formed by bonding a core to the end face of a track rail section.