JPH0384715A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a good head touch and to allow the stable execution of recording and reproducing by providing a recessed part on the slider gliding surfaces of the magnetic heads and decreasing the air bearing pressure generated between magnetic cores and sliders. CONSTITUTION:The recessed parts 25, 35 are provided on the sections of the other magnetic heads facing the magnetic cores 24, 34 of one of the magnetic heads 20, 30. Accordingly, the recessed parts 25, 35 formed on the respective sliders 22, 32 on the side facing the sliders 23, 33 provided with the magnetic cores 24, 34, allow the air bearing pressure generated between the magnetic cores and the sliders to escape therefrom and to lower the pressure. Consequently, the deformed layer of a magnetic recording medium 40 is decreased and the spacing between the magnetic gap surface and the magnetic recording medium 40 is diminished. The recorded and reproduced outputs are increased. Thus, the magnetic head with which the good head touch with the magnetic recording medium is obtained and the sufficient reproduced output is assured is obtd..

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a double-sided recording/reproducing type magnetic head that records and reproduces information by contacting a flexible magnetic recording medium.

(Prior Art) Conventionally, as a magnetic recording and reproducing device for recording and reproducing information,
Various floppy disk devices are used.

FIG. 12 is an explanatory diagram showing a magnetic head used in a general floppy disk device.

The magnetic head 50 is composed of two sliders 51 and 52, one of which has a magnetic core 53 formed therein. Further, the magnetic recording medium facing surface 54 of the magnetic head 50 has a planar shape.

The magnetic gap 55 is located approximately at the center of the length of the flat portion of the magnetic core 53 in the running direction of the magnetic recording medium.

Floppy disk drives come in single-sided and double-sided types, but double-sided floppy disks are more advantageous in terms of recording capacity, and double-sided floppy disk drives have a magnetic head 5 of the above structure.
13 and 14, a flexible magnetic recording medium 40, such as a floppy disk, is held between the front and back sides, and information is recorded and reproduced in this state.

As shown in FIG. 14, the magnetic cores 53 are arranged so as not to face each other in order to prevent magnetic interference between the upper and lower magnetic heads 50.

Also, the flat parts of the upper and lower magnetic heads 50 are connected to the magnetic recording medium 4.
15, both or one of the magnetic heads 50 is elastically supported to ensure contact with the magnetic head 50. That is, the magnetic head 50 is connected to the gimbal spring 91.
The gimbal spring 91 is attached to the carriage 9.
It is fixed at 2. The carriage 92 has a pivot 93
This pivot 93 acts on the center of the length of the flat portion of the magnetic head in the direction in which the magnetic recording medium runs, and applies a pressing force to the magnetic head 5o via the gimbal spring 91.

By supporting the magnetic head 50 in this way, the magnetic head 50 has a degree of freedom of rotation around the point of action of the pivot 93, and the mounting prevents uneven contact caused by errors and secures the flat surface of the magnetic head 50. magnetic recording medium 4
I try to make it touch 0.

(Problems to be Solved by the Invention) By the way, points that must be taken into consideration when designing the shape of the magnetic head and the magnetic head support structure are as follows:
The following can be considered.

(1) Regarding the contact between the magnetic gap and the magnetic recording medium, the tolerance for manufacturing and installation errors must be maximized.

(2) Considering the durability of the magnetic recording medium, reduce the FJ friction force, that is, the contact pressure between the head and the recording medium.

(3) Various magnetic recording media from different manufacturers, or
To be able to obtain a good contact condition (head touch) even when using magnetic recording media with different rigidities.

(4) Items (+), (2), and (3) above are satisfied even under a wide range of rotational conditions, such as changes in head load, rotational speed of the medium, and speed differences between the inner and outer circumferences of the medium. Something.

Particularly in recent years, with the development of information processing technology, CO-Cr media and Ba
-F media and other media are being actively developed, and there is a need to establish tribology technology for magnetic heads and magnetic recording media so that a variety of magnetic recording media can be used.

However, in the past, two magnetic heads 5 facing each other
0, as shown in FIGS. 13 and 14, the magnetic recording medium facing surfaces 54 are formed symmetrically to each other and are flat.

Therefore, when the magnetic recording medium 40 runs at high speed, a large air bearing effect occurs between the upper and lower magnetic heads 50.
This air bearing effect creates a large gap between the magnetic head 50 and the magnetic recording medium 40, resulting in poor head touch and a tendency for the reproduction output of the magnetic head 50 to decrease.

If the contact pressure between the magnetic head 50 and the magnetic recording medium 40 is increased in order to improve this head touch, a new problem arises in that the durability of the magnetic recording medium 40 is impaired.

Particularly recently, there has been a strong demand for higher running speeds of the magnetic recording medium 40, and the problem of the air bearing effect due to higher speeds has become more important.

This invention is proposed to solve these problems, and its purpose is to obtain a good head touch on various magnetic recording media without reducing the durability of the magnetic recording media, and to provide a sufficient head touch. An object of the present invention is to provide a magnetic head that ensures reproduction output.

[Structure of the Invention] (Means for Solving the Problems) In a magnetic head that is arranged substantially facing both sides of a flexible recording medium and records and reproduces information on the recording medium, one Four parts are provided at the part of the other magnetic head that faces the magnetic core of the magnetic helad.

Furthermore, the radial widths of the opposing portions of the magnetic heads disposed opposite to each other may be different from each other.

(Function) The recesses formed in each slider on the side facing the slider provided with the magnetic core release and reduce the air bearing pressure generated between the magnetic core and the slider that face each other, As a result, the amount of deformation of the magnetic recording medium is reduced, the gap between the magnetic gap surface and the magnetic recording medium is reduced, and the recording and reproducing output is increased.

Furthermore, since the first head and the second head are arranged with the side end surfaces of the opposing sliders shifted in the radial direction of the magnetic recording medium, the air bearing horns acting on the magnetic recording medium held between each slider are reduced.

(Example> Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a partial vertical sectional view showing a double-sided recording type magnetic head 10 according to a first embodiment of the present invention.

The double-sided recording type magnetic head 10 has a first magnetic head 20
(hereinafter referred to as the first magnetic head) and the second magnetic head 30
(hereinafter referred to as a second dedicated head), and a flexible disk magnetic recording medium 40 is interposed in the gap formed between each head 20, 30 to perform recording and reproduction. The first head 20 and the second head 30 have slider grooves 21 and 31, respectively, and sliders 22, 23 and 32, 33, which are sliding surfaces for the magnetic recording medium 40, are formed on both sides of the slider grooves 21 and 31, respectively. The slider 22 of the first head 20 and the second
The slider 32 of the head 30 is formed with a width A in the radial direction of the magnetic recording medium 40, and the slider 23 of the first head 20 and the slider 33 of the second head 30 are formed with a width B (A) in the radial direction.
>8).

Then, the first head 20 and the second head 30 align the slider grooves 21.31 in the same position, and the slider 22 of the first head 20, the slider 33 of the second head 30, and the slider 23 of the first head 20. The sliders 32 of the second head 30 are arranged to face each other. Slider 2
Since the width A of the slider 2.32 is wider than the width B of the slider 23.33, the side end surfaces of the sliders 22.32 protrude from the side end surfaces of the sliders 33.23, respectively, and the first head 20 and the second head of the magnetic recording medium 40 Both side portions sandwiched between the heads 30 are not constrained and are therefore deformable.

Also, the sliders 23 of the first head 20 and the second head 30
．． A magnetic core 24.34 with a magnetic gap (not shown) is formed in each of the magnetic cores 24.33.
4 is a magnetic recording medium 40 of each slider 23.33
It is arranged approximately at the center in the rotation direction (direction perpendicular to the plane of the paper in FIG. 1).

Slider 32.34 at a position opposite magnetic core 24.34.
22 is provided with a hole 35.25 as a recess that passes through the second head 30 and the first head 20, respectively. Hole 35
．． 25 should have at least one each, but the second
As shown in the figure, the first head 20 is provided with three holes 25 along the medium running direction.

Instead of such a hole 35.25, a slider 2, such as the first head 20 illustrated in the second embodiment in FIG.
2 as a recess (groove 36 in the second head 30)
may be formed. Like the hole 25, this groove 26 is disposed at a position facing the magnetic core 34, and is formed along the entire length of the slider 22 along the medium running direction.

Next, the action will be explained.

During recording and reproduction, the magnetic recording medium 40 rotates at high speed in a direction perpendicular to the plane of the paper in FIG.

Since both side portions of the magnetic recording medium 40 located on the side end surfaces of the slider 22.32 are not restrained by the opposing second head 30 and first head 20, the slider 22.32 is moved by high-speed running of the magnetic recording medium 40. A floating blade acts from the sliding surface due to air bearing action, and a minute deformation occurs in the magnetic recording medium 40 according to its rigidity. That is, as shown in FIG.
The portion of the first head 20 that is removed from the slider 23 is slightly bent downward, and the portion of the first head 20 that is removed from the slider 23 is bent slightly upward.

The air bearing effect that occurs in the gap between the first head 20 and the second head 30 due to the high-speed running of the magnetic recording medium 40 causes the side end surfaces of the sliders 22 and 32 to move toward the opposing slider 3.
3.23, it is smaller than in the case of the conventional magnetic head 50 with no deviation.

A hole 35. is located at a position facing the magnetic core 24.34.
25 or grooves 36.26, these magnetic cores 24.34
Slider 32.2 opposite slider 23.33 with
2, the air bearing pressure generated between the magnetic core 24 and the slider 32 and between the magnetic core 34 and the slider 22 is released into the hole 35.25 or the groove 36.26 and is further reduced. As illustrated in FIG. 1, the amount of deformation of the magnetic recording medium 40 is reduced and the magnetic recording medium 40 approaches the magnetic core 24.34 sufficiently, and the gap between the magnetic gap surface (not shown) and the magnetic recording medium 40 is sufficiently small. This improves recording and playback output.

In the embodiment illustrated in FIG. 1, holes 25, 35 are provided in both the first head 20 and the second head 30.
For example, one head may have a hole and the other head may have a groove, such as the first head 20 having a hole 25 and the second head 30 having a groove 36 as shown in FIG. Furthermore, these holes do not need to pass through the slider, and the shapes of the holes and grooves may be simply recessed portions 27 as shown in FIG. 4 as the third embodiment, for example. Or the fifth example shown as the fourth example.
As shown in the figure, a recess 2 is formed continuously with the slider groove 21.
8 may be provided. In this way, the recesses referred to in the present invention may be of various types as long as they have the above-mentioned function of reducing the air bearing force. Further, as shown in FIG. 6 shown as the fifth embodiment, the slider 22.3
2 magnetic core 24.34, slider 23.33 hole 2
5.35 and so on magnetic core 24.34 and hole 25.3
Of course, the same effect can be expected even if the formation position of 5 is reversed.

Next, the results of an information recording and reproducing experiment using two types of magnetic recording media 40 with different rigidities are shown in FIGS.
An example is shown in Figure 0.

FIG. 7 shows the results of measuring the reproduction output under the condition that the pressing force of the magnetic head against the recording medium is the load and the running speed of the magnetic recording medium is 5 m/s. The deformed state of the magnetic recording medium 40 assumed from the results shown in FIG. 7 is shown in FIGS. 8 and 9 when a conventional head without holes or grooves is used. FIG. 8 shows the thickness T of the magnetic recording medium 40.
Figure 9 shows the case where the thickness t is thin and the rigidity is small. That is, since pressure is generated in the magnetic recording medium 40 facing the sliders 22 and 32 due to the air bearing action, the magnetic recording medium 40 is deformed according to its rigidity.

The gap between the magnetic gap and the magnetic recording medium 40 is determined by the amount of this deformation. Since the reproduction output of the signal is inversely proportional to the gap between the magnetic gap of the magnetic head and the magnetic recording medium 40, the amount of deformation of the magnetic recording medium 40 is estimated from the value of the reproduction output, and the results shown in Figs. 8 and 9 are obtained, respectively. became.

That is, the magnetic recording medium 40 with low rigidity deforms too much and the head load area where the maximum output can be obtained is small as shown in FIG. The resulting head load area is large. As described above, the deformation of the magnetic recording medium 40 affects the recording and reproducing output, but this deformation can be reduced by providing holes or grooves in the slider (sliding surface) of the magnetic head to release pressure. I can do it.

FIG. 10 schematically shows a deformed state of a magnetic recording medium 40 having a thickness ↑ and high rigidity in an embodiment in which holes 25.35 are provided.

The deformation of the magnetic recording medium 40 becomes sufficiently small, and a good head touch can be obtained.

FIG. 11 is a partial vertical sectional view, not showing a double-sided recording type magnetic head 110, showing a sixth embodiment of the present invention. Here, the first magnetic head 120 and the second magnetic head 130 have a tapered structure in which the gap becomes larger as they approach the side end surfaces, and the side end surfaces are arranged in a state where they are substantially aligned.

Therefore, here, the sliders 123 and 133 are formed from a flat part B and a tapered part C, and B+C=A. Further, the gaps H and h shown in the figure are set so that the gap h is sufficiently larger than the gap H. This is to obtain the same effect as the air bearing force reduction effect due to the deviation of the magnetic head 20, 30 itself shown in the first embodiment.

Even in such an embodiment, as in the first embodiment,
Due to the influence of the holes 125 and 135 as concave portions, the magnetic recording medium 140 approaches the magnetic core sufficiently, and the gap between the magnetic gap surface (not shown) and the magnetic recording medium 140 becomes sufficiently small, so that the recording/reproduction output is reduced. improves. Of course, this embodiment can also be modified in the various ways described above, such as providing grooves instead of holes.

[Effect of the invention] As is clear from the above, according to the structure of the invention,
By providing a recess on the slider sliding surface of the magnetic head, the air bearing pressure generated between the magnetic core and the slider is reduced, reducing deformation of the magnetic recording medium and achieving good head touch, even during high-speed running. Stable recording and playback can be performed.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view showing a first embodiment of a double-sided recording type magnetic head of the present invention, FIG. 2 is a perspective view of the main part of FIG. 1, and FIG. FIG. 4 is an fApA diagram corresponding to FIG. 2 showing the third embodiment of the magnetic head, and FIG. 5 is a second diagram showing the fourth embodiment of the magnetic head. 6 is a partial vertical sectional view showing the fifth embodiment of the magnetic head, FIG. 7 is a reproduction output characteristic diagram of a double-sided recording type magnetic head, and FIGS. 8 and 9 are FIG. 7 is an explanatory diagram showing the deformation state of the magnetic recording medium by the conventional head used in the experimental example; FIG. 10 is an explanatory diagram showing the deformation state of the magnetic recording medium by the magnetic head of the present invention;
The figure is a partial vertical sectional view showing a sixth embodiment of the present invention.
Fig. 2 is an explanatory diagram of a conventional double-sided recording magnetic head, Fig. 13 is an explanatory diagram showing a state in which a magnetic recording medium is sandwiched between the upper and lower two magnetic heads of Fig. 12, and Fig. 14 is a side view of Fig. 12. 15 are explanatory diagrams showing a support structure for the magnetic head shown in FIG. 12. 10...Magnetic head 20...First head 30...Second head 22.23, 32.33...Slider 24.34...
・Magnetic core 25.35...hole (recess) 26.36...groove (recess) 40...magnetic recording medium

Claims (6)

[Claims] (1) In a magnetic head that is arranged substantially facing both sides of a flexible recording medium and records and reproduces information on the recording medium, the magnetic head of the other magnetic head faces the magnetic core of one magnetic head. A magnetic head characterized in that a recess is provided in a portion of the head. (2) The magnetic head according to claim 1, wherein the recess extends through the magnetic head. (3) The magnetic head according to claim 1, wherein the recess is formed in the shape of a groove. (4) The magnetic head according to claim 1, wherein the opposing portions of the magnetic heads arranged to face each other have different radial widths. (5) The side end surfaces of the magnetic heads arranged to face each other are shifted in the radial direction of the recording medium.
The magnetic head described. (6) The magnetic head according to claim 1, wherein the opposing portions of the magnetic heads arranged to face each other are formed in a tapered shape toward a side end surface.