JPH06180923A - Magnetic head - Google Patents

Abstract

PURPOSE:To stabilize sliding state between a magnetic head and a magnetic disc regardless of distortion of slider surface or waving of the magnetic disc. CONSTITUTION:A pair of rail parts 11, 12 are provided on the surface of a slider 10 and a core part 16 having a magnetic recording/playing gap 15 is provided for one rail part 11. A recess 17 is made substantially in the center of the other rail part 12 having no core part 16 and a pad 18 having predetermined elasticity is placed in the recess 17. In this regard, top surface 18A of the pad 18 projects by a predetermined amount above the top surface of the rail part 12 contiguous thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device, and more particularly to a magnetic head device used in a double-sided magnetic disk device.

[0002]

2. Description of the Related Art In a conventional double-sided magnetic disk device, a magnetic head is arranged so as to sandwich a magnetic disk, which is a recording medium, from the upper and lower sides.

FIG. 7 and FIG. 8 show a schematic structure of such a magnetic head. Here, FIG. 7 shows the magnetic head 51, when the magnetic disk 50 moves in the direction orthogonal to the paper surface.
FIG. 8 shows a schematic configuration of the magnetic disk 51, and FIG. 8 shows a schematic configuration of the magnetic heads 51 and 52 when the magnetic disk 50 moves laterally. In these figures, the magnetic disk 50
Magnetic heads 51 and 52, which are made of a non-magnetic ceramic material and have a twin-barrel shape, are relatively disposed at upper and lower positions with respect to each other.

As shown in FIG. 7, the upper magnetic head 51 is provided with a pair of rail portions 51A and 51B on the left and right, and one rail portion 51A has a magnetic field (not shown) for magnetic recording and reproduction. Core part 5 having a gap
3 is provided. On the other hand, the lower magnetic head 52
Like the upper magnetic head 51, a pair of rail portions 52
A and 52B are provided, and one rail portion 52 is provided.
A is provided with a core portion 54.

The core portions 53 and 54 are exposed so as to face the magnetic disk 50, and the upper magnetic head 51 is exposed.
The core portion 53 provided on the lower magnetic head 52 corresponds to the rail portion 52B of the lower magnetic head 52, while the core portion 54 provided on the lower magnetic head 52 corresponds to the rail portion 51B of the upper magnetic head 51. It is provided to be arranged.

The lower magnetic head 52 is mechanically fixed, and the upper magnetic head 51 is provided with a leaf spring 55 called a gimbal spring for allowing tilting in the front-back and left-right directions. There is. As a result, the upper magnetic head 5 with respect to the lower magnetic head 52 is
The followability that 1 can be pressed in parallel is secured.

[0007]

In such a conventional structure, since the magnetic heads 51 and 52 are made of hard ceramic, the rail portions 51A, 51B and 52 are formed.
It is difficult to machine the surfaces of A and 52B with high precision with high precision, and in recent years, when the high speed and the high recording density have been more and more advanced, the gap between the magnetic disk 50 and the magnetic disk 50 which occurs at the uneven flatness is present. Has become a major factor that deteriorates the recording / reproducing characteristics.

Therefore, it is required to improve the flatness of the rail portion, but this is not technically easy. Also, match the upper and lower rail surfaces exactly to each core part 5
Ensuring sufficient adhesion between the gaps 3, 54 and the magnetic disk 50 is difficult to achieve as the magnetic disk 50 rotates at high speed.

By the way, Japanese Patent Publication No. Sho 63-31872 proposes a structure for reducing the gap between the magnetic disk 50 and the gap when the flatness of the rail portion is not uniform.

9 and 10 show a structure equivalent to the structure described in the above publication. Here, the same components as those shown in FIG. 7 are designated by the same reference numerals and the description thereof will be omitted. 9 and 10, each magnetic head 5
The rails 1, 52 have only one rail 51A, 5
2A, pads 56 and 57 made of an elastic member are arranged on the opposite sides of the rails 51A and 52A with the magnetic disk 50 in between. Then, the magnetic disk 50 is pressed by these pads 56 and 57, and the magnetic disk 5 and the gap between the core portions 53 and 54 are pressed.
The gap with 0 can be reduced.

However, in such a structure, when the lower magnetic head 52 is tilted due to a manufacturing error, the distribution of the compressive stress in the entire pad 56 becomes non-uniform, which is shown in FIG. As described above, there is an inconvenience that the magnetic disk 50 cannot be concentrated and pressed in the gap. This is because the rail portion 51A on one side is supported only by the pad.

Further, since the pad 57 supports the pressing load of the upper magnetic head 51, the pad 57 is supported.
Due to the contact between the pad 57 and the magnetic disk 50, the wear of the pad 57 becomes large.

In short, such a structure is merely intended to prevent vibration when the head is loaded, which occurs when the gimbal method is not adopted.

[0014]

It is an object of the present invention to improve the disadvantages of the conventional example, and particularly when the surface of the magnetic head facing the magnetic disk has undulations, the gap and the magnetic field are not affected by the undulation. It is an object of the present invention to provide a magnetic head device capable of stabilizing a sliding state with a disk and performing high density recording / reproducing.

[0015]

SUMMARY OF THE INVENTION According to the present invention, there is provided a core portion having a pair of rail portions positioned at a predetermined interval on a slider surface facing a magnetic disk and having a gap for magnetic recording / reproducing on one rail portion. In a magnetic head device for a double-sided magnetic disk device, in which a pair of twin-barrel type sliders are provided, and the sliders are arranged relative to each other with the magnetic disk sandwiched between them, the core portion is A method is adopted in which a recess is provided in the substantially central portion of the other rail portion not provided, and a pad having a predetermined elasticity is arranged in this recess. This is intended to achieve the above-mentioned object.

Further, in the present invention, the pad top surface facing the magnetic disk protrudes from the top surface of the rail portion, and the pad top surface and the rail portion top surface in the state in which the magnetic disk is pressed. Is used on the substantially same plane.

Further, the top surface of each rail portion is provided in an arcuate surface shape along the running direction of the magnetic disk, and the substantially center of the pad is a gap portion of the magnetic head which is relatively arranged via the magnetic disk. Can be adopted corresponding to the above.

[0018]

In the present invention, since the pad is provided at the center of the rail portion, the contact state between the upper and lower magnetic heads and the magnetic disk can always be stabilized, and high density recording / reproducing can be performed well.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a magnetic head 1 according to this embodiment.
FIG. 2 is a perspective view thereof, and FIG. 2 is a side view thereof. In these figures, a pair of rail portions 11 and 12 are formed at a predetermined interval on a slider 10 formed of a non-magnetic ceramic material. One of the rail portions 11 and 12 is equipped with a core portion 16 having a gap 15 exposed to the magnetic disk 20 (see FIG. 3) on one rail portion 11.

Further, the other rail portion 12 not provided with the core portion 16 is provided with a recessed portion 17 substantially in the center thereof, and a pad 18 having an appropriate elasticity is attached to the recessed portion 17. There is. An example of the material of the pad 18 is a felt material used in audio equipment,
It is easily available. Also, this pad 18
Does not require high dimensional accuracy. This is because the strict dimensional accuracy is determined by the top surfaces of the rail portions 12 located on both sides of the pad 18.

The top surface 18A of the pad 18 is the rail portion 12
The size of the protrusion H is 0.2 to 0.5 mm in this embodiment.
It is said that.

3 and 4 show examples of actual use arrangements. Here, FIG. 3 is a side view of the magnetic disk 20 as viewed from a position where the magnetic disk 20 travels in a direction orthogonal to the plane of FIG.
Shows a side view seen from the position where the magnetic disk 20 travels in the lateral direction. In these figures, a magnetic disk 20 is interposed between a pair of upper and lower magnetic heads 1A and 1B. The lower magnetic head 1B is mechanically fixed, but the upper magnetic head 1A is supported by the gimbal spring 21 so as to be tiltable back and forth and left and right, and thereby the lower magnetic head 1B is tilted. On the other hand, the upper magnetic head 1A can follow.

The arrangement of the upper and lower magnetic heads 1A and 1B is as follows.
The core portions 16 and 16 are oriented in opposite directions so that they are not located on the same vertical line. That is, the upper core portion 1
6 is arranged so as to be opposed to the rail portion 12 of the lower magnetic head 1B. When the magnetic disk 20 is running, the pad 18 is crushed by the downward load applied to the upper magnetic head 1A, and the top surface 1 of the pad 18 is crushed.
8A is substantially aligned with the top surface of the rail portion 12.

FIG. 5 shows the relative positional relationship between the pad 18 and the core portion 16. As is clear from this figure, the pad 18 crushed by the downward load applied to the upper magnetic head 1A presses the magnetic disk 20 near the gap 15 in the center of the core 16 by its reaction force. Has become. Similarly to this,
The pad 18 of the upper magnetic head 1A also presses the magnetic disk 20 against the core portion 16 of the lower magnetic head 1B, whereby the undulation of the magnetic disk 20 and the inclination or flatness of each magnetic head 1A, 1B. Even if there are disturbance factors such as fluctuations, the magnetic disk 2
The contact state between 0 and the gap 15 can always be stably ensured, and high-density recording / reproduction can be performed.

Next, a second embodiment of the present invention will be described with reference to FIG. In this second embodiment, each rail portion 11, 1
The top surface shape of No. 2 is formed as circular arc surfaces 11A and 12A, and is characterized by points. That is, each rail part 11,
The top surface of 12 has arcuate surfaces 11A and 12A whose both ends are located closer to the anti-magnetic disk 20 side than the central part along the running direction of the magnetic disk 20.

According to such a configuration, the magnetic disk 2
A more smooth movement of 0 is possible, and the effect that more stable recording and reproduction can be performed is added.

[0028]

Since the present invention is constructed and operates as described above, according to this, since a pad having appropriate elasticity is arranged in the concave portion provided at the substantially center of the rail portion, this pad is used. It is possible to stably secure the contact state between the core gap and the magnetic disk by the prescribed elastic deformation of the above. Moreover, when the top surface shape of the rail part is an arc surface, this contact state is even better. Therefore, it is possible to provide a magnetic head device which is excellent in the conventional art and which is expected to greatly contribute to high density recording / reproduction in the double-sided magnetic disk device.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic head showing a first embodiment of the invention.

FIG. 2 is a side view of the magnetic head.

FIG. 3 is a side view showing an actual arrangement example of the magnetic heads.

FIG. 4 is a side view of FIG.

FIG. 5 is a side view showing a positional relationship between the pad and the gap of the core portion in the embodiment.

FIG. 6 is a side view showing a second embodiment of the present invention.

FIG. 7 is a side view showing a conventional magnetic head.

FIG. 8 is a side view of FIG. 7.

FIG. 9 is a side view for explaining a conventional magnetic head having a pad.

FIG. 10 is a side view of FIG. 9.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 magnetic head 1A magnetic head 1B magnetic head 10 slider 11 rail part 11A arc surface 12 rail part 12A arc surface 15 gap 16 core part 17 recess 18 pad 18A top surface 20 magnetic disk

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takayuki Masuda 5-7-1, Shiba, Minato-ku, Tokyo NEC Corporation (72) Inventor Makoto Miyazaki 32 Nishiyajima, Ota-shi, Gunma Gunma NEC Within the corporation

Claims (5)

[Claims] 1. A pair of rails having a pair of rails positioned at a predetermined interval on a slider surface facing a magnetic disk, and a core having a gap for magnetic recording and reproduction on one rail. In a magnetic head device for a double-sided magnetic disk device in which a twin-body slider is provided, and the sliders are relatively arranged with the magnetic disk sandwiched therebetween to perform predetermined recording / reproduction, the other rail without the core portion is provided. A magnetic head device, characterized in that a recess is provided substantially in the center of the portion, and a pad having a predetermined elasticity is disposed in the recess. 2. The magnetic head device according to claim 1, wherein a top surface of the pad facing the magnetic disk extends beyond a top surface of the rail portion. 3. The magnetic head according to claim 2, wherein the pad top surface and the rail portion top surface are located on substantially the same plane when the magnetic disk is pressed against the pad top surface side. apparatus. 4. The magnetic head device according to claim 1, wherein a top surface of each rail portion is provided in an arcuate surface along a traveling direction of the magnetic disk. 5. The magnetic head device according to claim 1, wherein a substantially central portion of the pad is positioned corresponding to a gap of the other magnetic head which is relatively arranged with the magnetic disk interposed therebetween.