JPH01251407A - Magnetic head device for floppy disk device - Google Patents

Abstract

PURPOSE:To reduce an adverse effect applied on a reproducing signal by a false signal by forming a false gap having an azimuth for a read/write gap by an alloy magnetic material forming the gap and a bonding part on one side of the gap confronting plane of a read/write core. CONSTITUTION:In a magnetic head consisting of the read/write core 31 and an erase core 32, the read/write gap 35 is formed by a core 33 comprising the read/write core 31 on one side and the alloy magnetic material 40. The alloy magnetic material 40 is attached on a core 34 on the other side, and the false gap 36 can be formed by the alloy magnetic material 40 and the core 34 on the other side by the existence of the alloy magnetic material 40. The false gap 36 is provided with the azimuth for the read/write gap 35 by performing the groove working of the bonding part of the core 34 and attaching the alloy magnetic material 40 on the part. Therefore, the false signal obtained by the false gap 36 is not affected adversely on the reproducing signal obtained by the read/write gap 35.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) The present invention relates to a magnetic head device for a floppy disk drive equipped with a metal-in-gap type magnetic head.

(Prior Art) Conventionally, in floppy disk drives, metal-in-gap type magnetic heads have been known as magnetic heads for reading and writing data to and from disks, which are magnetic recording media. A metal-in-gap type magnetic head has an alloy magnetic material adhered to one side of the gap-facing surface of a read/write core that constitutes the gap.

FIG. 3 is a plan view showing the structure of a conventional metal-in-gap type magnetic head, and this magnetic head consists of a read/write core 11 and an erase core 12. The read/write core 11 has two cores 13.1 facing each other.
4, with a read/write gap 1 approximately in the center.
5 and has a pseudo gap IB. Further, the erase core 12 is composed of two opposing cores 17 and 18, and an erase gap I9 is provided at both ends thereof. In the tunnel erase method, the erase gap 19 is arranged at a position temporally delayed with respect to the read/write gear amplifier 15 in the disk running direction (in the direction of the arrow).

Here, the read/write gap 15 is between one core 13 and the alloy magnetic material 20 constituting the read/write core 11.
It is formed from. This alloy magnetic material 20 is made of Zendust alloy, for example, and is attached to the other core 14 of the read/write core 11 made of ferrite. On the other hand, due to the presence of this alloy magnetic material 20, the alloy magnetic material 20
A pseudo gap 16 is formed between the bonded portion of the other core 14 constituting the read/write core 11 (the portion to which the alloy magnetic material 20 is attached).

By the way, in the conventional metal-in-gear knob type magnetic head, the adhesive part of the core 14 was flat, so the fourth
As shown in the figure, the read/write gap 15 and the pseudo gap 16 were parallel. Generally, the azimuth between the magnetization direction of the disk and the read/write gap 15 is 0°.
If the read/write gap 15 and the pseudo gap 16 are parallel as described above, the azimuth between the disk magnetization direction and the pseudo gap 16 is also 0''. .

When the azimuth between the magnetization direction of the disk and the pseudo gap 16 is Oe, the azimuth loss in the pseudo gap 16 is OdB. Due to the cloudiness, the pseudo signal obtained by the pseudo gap 16 is superimposed on the reproduced signal obtained by the read/write gap 15, which increases the noise component and causes a deterioration of the S/N ratio.

In addition, in the frequency characteristics of the reproduced output, if the azimuth loss in the pseudo gap 16 is OdB, the lead/
The reproduction output level of the write gap 15 decreases or increases depending on the frequency, and attenuates to the gap loss dip point. The problem here is that, depending on the frequency used for the recording signal, the resolution changes greatly due to the waviness in the frequency characteristics of the reproduced output. That is, if there is undulation in the frequency characteristics, the resolution may be high and a large shoulder may appear in the reproduced waveform. The large shoulders indicate that the phenomenon of output change amount/time change amount -0, which can be seen at the peak point of the reproduced waveform, also occurs near the reproduction car Ov. For this reason, spurious pulses are likely to be generated, resulting in an increased error rate. On the other hand, the resolution may be low, and in this case, the WM (write margin) will decrease.

Furthermore, in order to increase the linear density recording by high-density recording, it is necessary to narrow the gap length Gw of the read/write gap 15 shown in FIG. 3.

As such density increases, the ratio of the length relationship between the read/write gap 15 and the pseudo gap 16 tends to decrease. This indicates that the undulations of the frequency characteristics tend to become thicker, which leads to the above-mentioned adverse effects.

(Problems to be Solved by the Invention) As mentioned above, in the conventional metal-in-gap type magnetic head, the read/write gap and the pseudo gap are parallel, so the pseudo signal obtained by the pseudo gap is The read/write gap had a large negative effect on the reproduced signal.

The present invention has been made in view of the above-mentioned points, and provides a magnetic head device for a floppy disk device that can reduce the adverse effect of a pseudo signal obtained by a pseudo gap on a reproduced signal obtained by a read/write gap. The purpose is to

[Structure of the Invention] (Means for Solving the Problems) That is, the magnetic head device of the floppy disk drive according to the present invention has an alloy magnetic material attached to one of the gap-opposing surfaces of the read/write core that constitutes the gap. A magnetic head device for a floppy disk device comprising: a read/write gap formed by the other gap-opposed surface of the read/write core and the alloy magnetic material;
Further, a pseudo gap is formed by the alloy magnetic material and an adhesive portion of one of the gap-opposing surfaces of the read/write core so as to have an azimuth with respect to the read/write gap.

(Function) According to the above configuration, the pseudo gap is formed to have an azimuth with respect to the linear/write gap. Therefore, the pseudo signal obtained by this pseudo gap is reduced compared to the case where the read/write gap and the pseudo gap are parallel, and does not adversely affect the reproduced signal obtained by the read/write gap.

(Embodiment) Hereinafter, a magnetic head device for a floppy disk device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing the structure of a metal-in-gap type magnetic head, and this magnetic head consists of a read/write core 31 and an erase core 32. Lead/
The write core 31 consists of two cores 33 and 34, and has a read/write gap 35 and a pseudo gap 36 approximately in the center thereof. Further, the erase core 32 is composed of two cores 37 and 38, and has an erase gap 39 at both ends thereof. In addition, in the tunnel erase method,
In the disk running direction (arrow A direction), the erase gap 39 is arranged at a position temporally delayed with respect to the read/write gap 35.

The read/write gap 35 is the read/write core 3
1 and an alloy magnetic material 40. This alloy magnetic body 40 is made of, for example, an industrial alloy, and the hard/write core 3 is made of ferrite.
It is attached to the other core 34 constituting 1. On the other hand, due to the presence of this alloy magnetic material 40, the adhesive portion (
A pseudo gap 3 is formed between the part to which the alloy magnetic material 40 is attached.
G will be formed.

In this case, the pseudo gap 36 is formed to have an azimuth with respect to the read/write gap 35 by grooving the contact portion of the core 34 and attaching the alloy magnetic material 40 thereon.

Here, the manufacturing process of the magnetic head in this embodiment will be explained with reference to FIG.

That is, first, the gap facing surface 34a of the core 34 shown in FIG. 2(a) is grooved as shown in FIG. 2(b).

This core 34 is made of ferrite, for example. and,
As shown in FIG. 3C, an alloy magnetic material 40 made of, for example, an industrial alloy is attached to the grooved gap facing surface 34a. In this case, the thickness of the deposited film of the alloy magnetic material 40 needs to be made thicker than the film thickness in the final shape, taking into consideration the amount of polishing of the alloy magnetic material 40, which will be described later.

Next, in order to form the read/write gap 35, the gap-facing surface 40a of the alloy magnetic material 40 is polished to make it planar, as shown in FIG. 2D. After completing the flattening in this way, as shown in FIG. Gap length Gw
Determine.

The pseudo gap 36 formed by such a process is
It will be curved. When pseudo gap 3B curves,
The pseudo gap 3G is non-parallel to the read/write gap 35. Generally, the azimuth between the magnetization direction of the disk and the read/write gap 35 is set to be 0°, and when the read/write gap 35 and the pseudo gap 1G are non-parallel as described above. A predetermined azimuth filter is provided between the magnetization direction of the disk and the pseudo gap 36. That is, the pseudo gap 36 has an azimuth (an angle other than 0°) with respect to the read/write gap 35.

If the pseudo gap 36 has an azimuth, the azimuth loss in this pseudo gap 36 will be OdB or more.

Therefore, due to this azimuth loss, the pseudo signal obtained at the pseudo gap 36 is reduced compared to the case where the pseudo gap 3B and the read/write gap 35 are parallel.
The read/write gap 35 does not adversely affect the reproduced signal obtained.

Although this embodiment has been described as a tunnel erase type magnetic head, the present invention is not limited to this.
The present invention can also be applied to a magnetic helad of the advance wide erase method, and in this case as well, the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, there is provided a magnetic head device for a floppy disk drive in which an alloy magnetic material is attached to one side of the gap facing surface of the linear read/write core constituting the gap. A read/write gap is formed by the other gap facing surface of the read/write core and the alloy magnetic material, and a read/write gap is formed by the alloy magnetic material and an adhesive part of one of the gap facing surfaces of the read/write core. Since the pseudo gap is formed so as to have an azimuth with respect to the read/write gap, it is possible to reduce the effect of the pseudo signal obtained by the pseudo gap on the reproduced signal obtained by the read/write gap.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the configuration of a magnetic head according to an embodiment of the present invention, FIGS. 2(a) to 2(e) are diagrams for explaining the manufacturing process of the magnetic head of the embodiment, FIG. 3 is a plan view showing the structure of a conventional magnetic head, and FIG. 4 is a diagram showing the structure of the main parts of the magnetic head shown in FIG. 3. 31... Read/write core, 32... Erase core, 33 and 34... Core, 35... Read/write gap, 36... Pseudo gap, 37 and 3
8... Core, 39... Erase gap, 40...
・Alloy magnetic material. Applicant's agent Patent attorney Takehiko Suzue (a) (d)
L Busy) Figure 2-1 Figure 3-100 Figure 4

Claims (1)

[Scope of Claims] A magnetic head device for a floppy disk drive in which an alloy magnetic material is attached to one of the gap-opposing surfaces of read/write cores constituting the gap, wherein the other gap-opposing surface of the read/write cores and a read/write gap formed from the above-mentioned alloy magnetic material; and an adhesive part of one of the gap-opposing surfaces of the above-mentioned alloy magnetic material and the above-mentioned read/write core, and has an azimuth with respect to the above-mentioned read/write gap. 1. A magnetic head device for a floppy disk device, comprising a pseudo gap.