JPH0240124A - Magnetic head for floppy disk device - Google Patents

Abstract

PURPOSE:To improve traceability and to suppress a stick-slip phenomenon by forming the width of a magnetic core on a first sliding plane having the magnetic core of a magnetic head in a direction perpendicular to the longitudinal direction less than that of a second sliding plane at the opposite side of a groove in a center part. CONSTITUTION:The magnetic head is provided with a pressure point in the center of the groove formed by being sandwiched between the first and second sliding planes brought into contact with a medium 6, and also, provided with the magnetic cores 3a and 3b on the first sliding plane. Here, the area of the first sliding plane is formed less than that of the second sliding plane. Therefore, it is possible to stabilize the contact state of the magnetic recording medium 6 with the magnetic head in a satisfactory state. In such a way, the traceability can be improved even when the stick-slip phenomenon due to the shaking of the plane of the magnetic recording medium or the height of bearing is generated, and stick-slip can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a magnetic head used in a floppy disk drive.

[Conventional technology]

In recent years, as the recording density of floppy disk drives has increased, the quality of contact between the magnetic head and the magnetic recording medium has become a problem. That is, due to narrower recording tracks and higher linear recording densities, slight variations in the contact state between the magnetic head and the magnetic recording medium have a large adverse effect on the reproduction output.

The magnetic head conventionally used in floppy disk drives has a magnetic core 17 sandwiched between a slider A15 and a slider B16, as shown in FIG. The structure of the sliding surface does not have an appropriate solution to the above-mentioned problems.

[Problem to be solved by the invention]

There are two causes for the deterioration of the contact state between the conventional magnetic head and the magnetic recording medium described above.

The first cause is (1) long-period output fluctuations due to a phenomenon in which the entire magnetic head rides on a wave due to the surface runout of the magnetic recording medium.

The second cause is (2) the stick-slip phenomenon due to high surface pressure (flat surfaces stick together when pressed together at a certain high pressure, and by moving them, they separate and stick in short cycles). ), which causes short-term output fluctuations.

Conventional magnetic heads have no solution to these problems in their structure. Therefore, in order to solve the first cause, there is a method of simply strengthening the contact of the magnetic head with the recording medium. However, if the contact is made with strong pressure, the recording medium deteriorates significantly and directly causes the second cause. In order to solve only the second cause, lowering the load on the magnetic head causes the first cause, and also tends to create a space between the medium surface and the magnetic head, resulting in a decrease in output and a decrease in frequency. There is a tendency for characteristics to deteriorate and become unstable.

An object of the present invention is to provide a magnetic head that can maintain a good and stable contact state between the magnetic recording medium and the magnetic head due to the first and second causes.

[Means to solve the problem]

The magnetic head of the present invention includes a pressure point at the center of a groove formed between first and second sliding surfaces that contact a medium, and a magnetic core on the first sliding surface. The magnetic head is characterized in that the area of the first sliding surface is smaller than the area of the second sliding surface.

FIG. 1 is a perspective view of an embodiment of the present invention.

The configuration is the same as the conventional example, but the areas on both sides of the central groove are not symmetrical as in the conventional example, but are equal to the width S1 of the magnetic recording medium contact surface on the side where the magnetic core 3 is not present. On the other hand, the width S2 of the contact surface portion on the side where the magnetic core 3 is located is narrow;
For example, it is processed so that S+:52=1:2.

FIG. 2 is a side view of a magnetic head assembly for a floppy disk drive using the magnetic head described above on both sides. The magnetic head is fixed to gimbals 4a and 4b,
It can tilt while being supported by a weak restoring force around the pivots 5a and 5b. The magnetic recording medium 6 is sandwiched between upper and lower magnetic heads as shown in the figure, and its running direction is vertical in the figure.

The magnetic heads on both the upper and lower surfaces are fl, by the corners of the sides without and with the magnetic cores 3a and 3b, respectively.

It is chamfered by ρ2.

Next, the operation will be explained with reference to FIG.

First, regarding (1) vibration of the magnetic recording medium surface, which is one of the causes of deterioration of the contact state between the magnetic head and the magnetic recording medium, a perpendicular force F due to the above cause is applied to the sliding surface of the magnetic head.
+, F 2 (F + IwaF 2 ) is applied, the distance from pivot) 5a to the point of application of that force is d+, d
2, a counterclockwise moment is generated around the pivot 5a as shown by the arrow in the figure.

Therefore, the magnetic core 3a is attached to the magnetic recording medium 4a, and no reduction in output occurs. F in the diagram, ,F
2 and the opposite force (that is, the reaction force that causes the medium to move away is the force F in the figure)
Since it acts in the direction in which the magnetic head 1 is applied, the magnetic heads on both sides rotate, and the tracking performance is improved compared to the conventional one.

In addition, regarding the second cause (2) stick-slip phenomenon due to high surface pressure, this magnetic head is able to reduce the contact area with the magnetic recording medium regardless of the deflection of the magnetic recording medium surface, as described above. Since it is possible to reduce the load on the magnetic head without reducing the pressure per unit area of the sliding surface of the magnetic head. As a result, the total load is reduced compared to the conventional one, and stick-slip, which acts as an excitation force on the entire magnetic head, can be suppressed.

〔Effect of the invention〕

As explained above, in the present invention, the width in the direction perpendicular to the longitudinal force of the magnetic core of the first sliding surface having the magnetic core of the magnetic head ＼, By making the width smaller than the width of the second sliding surface on the side, it may cause deterioration of the contact condition between the magnetic recording medium and the magnetic head (1)
Even if there is a stick-slip phenomenon due to vibration of the magnetic recording medium surface or (2) high surface pressure, the followability can be improved and the stick-slip phenomenon can be suppressed.

Further, the magnetic head of the present invention has a simple structure,
Since it can be manufactured using the same technology as conventional products, there are no problems such as increased costs.

Cymbal, 5a, 5b... Pivot, 6...
...Magnetic recording medium.

Claims (1)

[Claims] In a magnetic head of a floppy disk device, a pressure point is provided at the center of a groove formed between first and second sliding surfaces that contact a medium, and a magnetic core is provided on the first sliding surface. . A magnetic head, wherein the width of the first sliding surface in a direction perpendicular to the longitudinal direction of the magnetic core is smaller than the width of the second sliding surface.