JPS6318512A - Magnetic head device - Google Patents

Abstract

PURPOSE:To prevent damage on the surface of a magnetic disk at the medium sliding face ridge of a magnetic head core by displacing the head gap of the magnetic head core so as to be arranged to a 2nd leg side from the breadthwise center of the magnetic head core so as to obtain an excellent characteristic. CONSTITUTION:The track breadthwise direction center of the head gap 7 of the recording/reproducing head core 5 in the magnetic head core is displaced toward the slot 10 side from the breadthwise center of the core 3 and had gaps 6a, 6b of the erasure head core 4 are displaced toward the slot 10 so as to be placed at both ridges of the head gap 7. The ridge of the medium sliding face at the opposite side to the slit 10 is chamfered, and since a sufficient wide space is produced to the magnetic head core 3 at the opposite side to the slot 10 of the medium slide face, the radius of chamfering is increased and the width of chamber margin 11 is widened. As a result, the damage of surface due to flexture is prevented in using the titled head for a disk device and since the head gaps 6a, 6b, 7 are displaced from being parted from the chamber margin 11, the intimate contact of the magnetic disk is excellent and the characteristic of the magnetic head core 3 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head device suitable for a device using a disk capable of double-sided recording and playback, such as a floppy disk device.

[Conventional technology]

A disk device using an FFF disk capable of double-sided recording and reproduction is provided with a pair of magnetic head devices, which sandwich the magnetic disk so that recording and reproduction can be performed on both sides. In such a magnetic head device, when the magnetic disk is visible such as a floppy disk, conventionally, one leg (
Hereinafter, this is referred to as the first leg, and the other leg is referred to as the second leg), and a magnetic head 7 in which a recording/reproducing head core and an erasing head core are integrated is fixed. There is. The end surfaces of these first and second leg portions lie within a common plane and form a medium sliding surface. Further, the medium sliding surface of the magnetic head core fixed to the first leg is also within this common plane.

Two magnetic head devices having such a configuration are attached to a disk device so as to sandwich a magnetic disk, but in this case, the first leg of one (d) head device is connected to the second leg of the other magnetic head device. The magnetic disk is sandwiched between a first leg of one magnetic head device and a second leg of the other magnetic head device. The legs are just sliders, but
It has the effect of bringing the magnetic disk into stable contact with the magnetic head core.

By the way, in order to improve the recording and reproducing characteristics of a disk device, it is sufficient to increase the pressing force of each magnetic head device against the magnetic disk and increase the adhesion between the magnetic head core and the magnetic disk. The load will increase and the surface of the magnetic disk will rapidly wear out. To deal with this, the width of the first leg to which the magnetic head controller 7 is fixed is made narrower, and the area of the medium sliding surface of the first leg is made smaller than the area of the medium sliding surface of the second leg. , and 2
A magnetic head device has been proposed in which, when two magnetic head devices are arranged, the inner side of the first leg portion on the negative side matches the inner side of the second leg portion on the other side.

According to such a magnetic head device, even if the pressing force of the magnetic head device to the magnetic disk is increased, the load and surface wear on the magnetic disk are reduced. however,
If the two magnetic head devices are even slightly deviated from the above arrangement, the pressing force of the magnetic head devices causes the magnetic disk to bend, causing a problem in that the surface of the disk is damaged.

In addition, as a finishing process for such a magnetic head device, after the magnetic head core is fixed, the end surfaces of the first and second legs are polished to form a medium sliding surface. Since the head core is made of ferrite and these materials are different, it is extremely difficult to include the medium sliding surfaces of the magnetic head core part and other parts in the first leg in a common plane, and usually, The medium sliding surface of the magnetic head core is recessed more than the other portions of the medium sliding surface. For this reason, there was a problem in that the adhesion between the magnetic disk and the magnetic head core deteriorated, and the recording and reproducing characteristics deteriorated.

Therefore, in order to solve this problem, the present inventors have
proposed a magnetic head device in which a magnetic head core is fixed to a core holder having only two legs, this magnetic head core is used as a first leg, and the legs of the core holder are used as a second leg (patent application (Sho 59-165566). This magnetic head device will be explained below with reference to FIG. In addition, the same figure (A)
CB) is a plan view thereof, and CB) is a sectional view thereof, in which l is a core holder, 2 is a second leg, 3 is a magnetic head core, and 4 is a sectional view.
5 is an erasing head core, 5 is a recording/reproducing head core, 5a,
6b and 7 are head gaps, and 8a to 8e are glasses.

In the figure, a core holder 1 made of ceramics etc.
has a protruding second leg 2, and a magnetic head core 3 is fixed to an end of the core holder 1 on the opposite side from the second leg 2.

The magnetic head core 3 forms a first leg with respect to the second leg 2. The end faces of the second m portion 2 and the magnetic head core 3 each form a medium sliding surface and are included in the same plane.

The magnetic head core 3 is constructed by integrating the erasing head core 4 and a recording/reproducing head 75. These are arranged so that the erase head core 4 scans the portion of the magnetic disk scanned by the recording head core 5 afterwards. The recording head core 5 has one head gap 7 and is covered with glass 8a.

The track width is regulated to a predetermined value by 8b.

In addition, the erasing head core 4 has two spacing gaps 5a.
, 5b, and are separated from each other by approximately the track width of the head gap 7 by a glass 8c. These head gaps 6a.

The track width of 6b is regulated by glasses 8d and 8e on both sides.

The width of the magnetic head core 3 is made narrower than the width of the second leg portion 2, so that the medium sliding surface of the former is smaller than the medium sliding surface of the latter. When a magnetic head device having such a configuration is provided in a disk device, as shown in FIG. As if facing the
The distance between the magnetic head core 3 and the second leg is set, and the magnetic head core 3 is placed in a disk device.

According to the magnetic head device having such a configuration, the magnetic head core 3 clamps the magnetic disk 9 with its medium sliding surface always facing the medium sliding surface of the second leg.
The deflection of the magnetic head core 3 and the second leg portion 2 can be reduced and the occurrence of scratches on the surface can be suppressed, and the medium sliding surfaces of the magnetic head core 3 and the second leg portion 2 can be easily included in the same plane.

[Problem that the invention seeks to solve]

In such a magnetic head core 3, the adhesiveness with the magnetic disk is the best at the center in the width direction of the medium sliding surface. Therefore, in order to optimize the recording and reproducing characteristics, the head gap 7 of the recording and reproducing head core 5 in FIG. It is located in .

By the way, although it was explained earlier that the magnetic disk 9 is reduced in deflection according to such a magnetic head device, in reality, the magnetic disk 9 is slightly deflected at the edge of the medium sliding surface of the magnetic head core 3. This is because the outer part of the medium sliding surface of the magnetic disk 9 is formed by an air layer to form the second leg 2.
This is due to the media trying to separate from the sliding surface. In FIG. 6, this deflection is relatively large on the side opposite to the groove 10 between the second tab 2 and the magnetic head core 3 with respect to the medium sliding surface of the magnetic head core 3.

On the groove 10 side, the air flow in the groove 10 causes a pressing force on the magnetic disk 9 against the medium sliding surface of the second leg portion 2, so that the magnetic disk 9 hardly bends.

On the other hand, the edge of the medium sliding surface of the magnetic head core 3 is angular, and as a result, when the magnetic disk 9 bends, there is a problem in that the surface of the magnetic disk 9 is scratched at this edge. . Therefore, it is conceivable to round the edge of the medium sliding surface on the side opposite to the groove 10.

However, in order to prevent an increase in the load on the magnetic disk 9 and abrasion of the surface of the magnetic disk 9, the width of the magnetic head core 3 is narrowed, and for this purpose, the width of the rounded area (rounding margin) is reduced. If it is made wider, this radius will reach the vicinity of the head gaps 6b and 7 of the magnetic head core 3. If a rounding allowance is provided, the adhesion of the magnetic disk 9 to the medium sliding surface of the magnetic head core 3 on the side where the rounding allowance is provided deteriorates, but when this rounding allowance reaches the vicinity of the head gaps 6b and 7, The adhesion of the magnetic disk 9 in these head gaps 6b and 7 deteriorates, resulting in deterioration of erasing characteristics and recording/reproducing characteristics. So, in reality,
The width of the rounding margin cannot be made very wide, and for this reason, the effect of rounding the medium sliding surface line portion of the magnetic head core 3 cannot be sufficiently obtained, and the surface of the magnetic disk 9 may be damaged. It was inevitable that it would happen.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head device that eliminates such problems, provides good characteristics, and prevents damage to the magnetic disk surface at the edge of the medium sliding surface of the magnetic head core. be.

[Means for solving problems]

In order to achieve the above object, the present invention displaces the head gab of the magnetic head core so that it is disposed closer to the second leg than the widthwise center of the magnetic head core.

〔Example〕

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

FIG. 1(A) is a plan view showing an embodiment of a magnetic head device according to the present invention, and FIG. 1(B) is a cross-sectional view thereof.
is a rounding margin, and parts corresponding to those in FIG. 5 are given the same reference numerals and redundant explanations will be omitted.

In FIG. 1, in the magnetic head core 3, the head gap 7 of the recording/reproducing head core 5 is displaced so that the center in the track width direction is closer to the groove 10 than the center in the width direction of the magnetic head core 3, and accordingly Then, the blade gaps 5a and 5b of the erasing head core 4 are also displaced toward the groove 10 so as to be located at both edges of the head gap 7.

The edge of the media sliding surface opposite to the grooves 10 is rounded, but since a sufficiently wide margin is created on the opposite side of the media sliding surface of the magnetic head core 3 to the grooves 10, the radius of this rounding is can be made larger, and the width of the rounding allowance 11 can be made wider.

As a result, as shown in FIG. 2, when this embodiment is used in a disk device, the effect of this rounding becomes noticeable, and surface damage due to bending of the magnetic disk 9 can be prevented. In addition, in FIG. 1, each head gap 5a,
Since 6b and 7 are displaced away from the rounding margin 11, the adhesion of the magnetic disk at these points is good, and the characteristics of the magnetic head core 3 are improved.

FIG. 3 is a characteristic diagram showing the reproduction output according to the amount of deviation of the center of the head gap 7 in the track width direction with respect to the width direction center of the portion of the medium sliding surface of the magnetic head core excluding the radius. As is clear from Fig. 3, the magnetic head core 3
On the medium sliding surface of , the adhesion of the magnetic medium is best at the center in the width direction excluding the rounding allowance 11, so each head is Most preferably, gaps 6a, 6b, 7 are located.

FIG. 4 is a perspective view showing the overall configuration of the embodiment shown in FIG. 1.

〔Effect of the invention〕

As explained above, according to the present invention, even if the edge of the medium sliding surface of the magnetic head core is rounded with a large radius, the adhesion of the magnetic disk to the head gap is good, and therefore the characteristics of the magnetic head core are improved. It is possible to prevent surface damage due to deflection of the magnetic head while maintaining the magnetic head in good condition.

[Brief explanation of drawings]

FIG. 1(A) is a plan view showing an embodiment of a magnetic head device according to the present invention, FIG. 1(B) is a sectional view thereof, and FIG. , 3rd
The figure is a characteristic diagram showing the reproduction output according to the position of the head gap of this embodiment, FIG. 4 is a perspective view showing the overall configuration of the embodiment shown in FIG. 1, and FIG. FIG. 6 is a plan view showing the magnetic head device proposed by the inventors, FIG. 6B is a sectional view thereof, and FIG. DESCRIPTION OF SYMBOLS 1... Core holding body, 2... Second leg part, 3... First leg part (magnetic head core), 4...
... Erasing head core, 5 ... Recording and reproducing head core, 5a. 6b, 7...Head gap, 9...
Magnetic disk, 11...Rounding allowance. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] First and second legs are provided with a medium sliding surface in a common plane and are spaced apart from each other by a predetermined distance, the first leg is made of a magnetic head core, and the second leg is made of a magnetic head core. In a magnetic head device that acts as a slider and has a medium sliding surface area of the first leg smaller than an area of a medium sliding surface of the second leg, 1. A magnetic head device characterized in that a head gap in a magnetic head core is displaced from the widthwise center of the first leg toward the second leg.