JPH0417171A - Magnetic head support mechanism - Google Patents

Abstract

PURPOSE:To improve the recording density by containing a magnetic head slider in a recessed part of a support arm till a medium reaches a prescribed speed at starting and the medium drive speed is decreased to the prescribed speed at stopping. CONSTITUTION:When a magnetic disk 1 is at stand still, a magnetic head slider 2 is contained in a recessed part 6 of a support arm 4 and when the magnetic disk 1 starts driving, an air flow along with the driving direction is caused between the magnetic disk 1 and the support arm 4, the magnetic head slider 2 supported by a film 13 is depressed onto the surface of the magnetic disk 1 as a negative pressure is generated in the recessed part 6 and the magnetic head slider 2 is floated minutely by the balance between the floating force and the pressure from the film 13. At the stop of the magnetic disk 1, the air flow between the magnetic disk 1 and the support arm 4 is gradually lost and the magnetic head slider 2 is parted from the magnetic disk 1 while being drawn by the film 13. Thus, the low floating quantity of the magnetic head slider is attained and the recording density is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support mechanism for a magnetic head mounted on a magnetic disk device.

[Prior Art] FIG. 5 is a configuration diagram showing a conventional magnetic head support mechanism disclosed in, for example, Japanese Patent Laid-Open No. 108576/1983. In the figure, (1) is the medium, that is, a magnetic disk, and (2)
is a magnetic head slider, (3) is a head suspension, (4) is a head support 7-4, (5> is a magnetic disk (
1) is a spindle that rotates.

Next, the operation will be explained. A narrower gap between the surface of the magnetic disk (1) and the head is advantageous for increasing the recording density. In order to achieve this, the magnetic disk device maintains the gap between the head and the magnetic disk (1) to a submicron level through fluid lubrication using air flow generated by the running of the magnetic disk (1).

The head slider (2) generates this floating blade. Suspension (3) is this head slider (2)
) is held softly, the head slider (2) follows the undulations of the disk (1) surface, and an appropriate load is applied to the head slider (2) to maintain the gap between the head and the disk (1> (hereinafter referred to as the flying height)). Also, since the head slider (2) floats due to the dynamic pressure caused by the running of the magnetic disk (1), when the magnetic disk (1) stops running, the load from the suspension (3) is applied to the magnetic disk (1). Tail in contact.

The so-called contact start-stop (hereinafter abbreviated as C8S) method is adopted, in which the aircraft floats up while contacting and sliding when starting, and lands while contacting and sliding when stopped.

[Problem to be solved by the invention] Now, if the recording density on the magnetic disk (1) is increased,
It is necessary to lower the flying height of the head slider (2).However, the number of contact sliding passes in the C8S method is low (as the steady flying height of the head slider (2) increases), so friction and wear at this time are reduced. becomes a problem.For example, C8S
As the number of times the machine starts and stops increases, the friction coefficient increases and the starting torque becomes insufficient, and abrasion powder is deposited on the head slider (2).
) and prevent the head slider (2) from floating. In addition, when trying to lower the flying height of the head slider (2), the surface roughness of the magnetic disk (1) must be reduced in order to avoid contact with the magnetic disk (2). Small (then magnetic disk (
1) When stopped, the head slider (2) and magnetic disk <1
) adhesion occurred, which also caused the problem that the magnetic disk <1) stopped rotating.

Therefore, these problems have been a major obstacle to increasing the recording density of magnetic disk devices.

This invention was made to solve the above-mentioned problems, and makes it possible to reduce the flying height of the magnetic head slider while avoiding friction, wear, and adhesion when starting and stopping a magnetic disk device. An object of the present invention is to provide a magnetic head support mechanism that can improve the recording density of a magnetic disk.

[Means for Solving the Problems] A magnetic head support mechanism according to the present invention includes a support arm disposed with a gap between the medium and the magnetic head slider for moving the magnetic head slider, a recess formed in the support arm, and a recess provided in the recess. The magnetic head slider is provided with a mechanism that stores the magnetic head slider in the recess until the medium runs at a predetermined speed during startup and when the speed of the medium falls below a predetermined speed when stopped.

[Function] In the magnetic head support mechanism according to the present invention, the magnetic head slider and the medium do not come into contact with each other until the medium runs at a predetermined speed during startup and when the medium travel speed drops below a predetermined speed when stopped. Friction, abrasion, and adsorption between the media and the media can be avoided. Additionally, since the magnetic head slider is housed in a recess, the magnetic head slider does not vibrate due to the influence of airflow caused by the medium running and come into contact with the medium until the magnetic head slider gets close enough to the medium and the flying blades act on the magnetic head slider. do not have.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, (6> is a recess formed in the support arm (4), and (13) is a stretchable film that holds the magnetic head slider (2). This film (13) is made of, for example, silicone rubber. 2 and 3 are cross-sectional views illustrating the operation of the magnetic head support mechanism shown in FIG. 1 when the magnetic disk is stationary and running, respectively.

In the figure, (7) is an air reservoir, and a magnetic disk (
1) Expands due to airflow from driving.

Next, the operation will be explained. When the magnetic disk (1) is stationary, the magnetic head slider (2) is housed in the recess (6>) of the support arm (4). When the magnetic disk (1) starts running, the magnetic head slider (2) and support arm (4
), an air flow along the running direction is generated between the two. Since this airflow passes through the sides of the recess (6>), negative pressure is generated in the recess (6>).In order to make this negative pressure generation effective, support arm (4) and magnetic disk (1) The surfaces are placed as close together as possible.Now, when negative pressure is generated in the recess (6〉), the membrane (13) expands due to the air pressure in the air reservoir (7) inside. The magnetic head slider (2) is pressed against the surface of the magnetic disk (1).As a result, the magnetic head slider (2)
The magnetic disk (13) floats while maintaining a small floating amount due to the balance between the pressure from the membrane (13) and the floating blade from the floating surface.Next, when the magnetic disk (1) stops, the magnetic disk (1) and the support arm The air flow between (4) gradually becomes zero.
6), the negative pressure is no longer generated, the film (13) deflates, and the magnetic head slider (2) is pulled by the film (13) and separates from the magnetic disk (1).

Note that the film (13) may swell and the magnetic head slider (2) held by the film (13) is pressed against the surface of the magnetic disk (1), or the film (13) deflates and the magnetic head slider (2) is pressed against the surface of the magnetic disk (1). The traveling speed of the magnetic disk (1) when moving away from the disk (1) depends on the volume of the air reservoir (7), the material and thickness of the membrane (13), and the distance between the support arm (4) and the magnetic disk (1). Distance, film (13) and magnetic disk (
1) Determined by the distance between the two.

In the above embodiment, a case has been described in which a magnetic head slider (2) that generates only positive pressure is used, but a negative pressure type slider that generates negative pressure may also be used. A negative pressure slider has a recess that generates negative pressure on the flying surface. When the slider gets close enough to the magnetic disk, negative pressure is generated, and the flying height is determined by the balance between the positive pressure, negative pressure, and load. Ru. In a negative pressure slider, the influence of the load from the membrane (13) is reduced, so it is expected that the variation in flying height will be reduced.

FIG. 4 is a sectional view showing another embodiment of the invention. In the figure, (8> is the pin for determining the pivot position,
(9) is a protrusion, (10) is a plate spring that transmits force to the protrusion (9) and flexibly holds the magnetic head slider (2), (11)
> is a bimorph element for operating the leaf spring (10), (12a) and (12b) are gimbals, and a pin (8) is interposed between the two gimbals (12a) and (12b).

In a device having such a configuration, when the disk is stationary, no voltage is applied to the bimorph element (11), and the magnetic head slider (2) moves away from the magnetic disk (1) as shown in Fig. 4. Recess (6) in support arm (4)
) is stored in. When the magnetic disk (1〉) starts running, an airflow is generated on the disk surface, but the slider
2> is housed in the recess (6) and is isolated from the airflow, so it vibrates under the influence of the airflow and causes the magnetic disk (1
) have no contact with. When the magnetic disk (1) reaches a predetermined rotation speed, for example, a constant rotation speed, a force is applied to the bisulf element (11) to apply force to the leaf spring (lO), and the protrusion (9) +: ! Press the resin pulse (12a) and the gimbal (12b) with the pin (8>) and bring the magnetic head slider <2> closer to the magnetic disk (1).The leaf spring (lO) applies excessive force to the magnetic head slider (2> When force is applied, the magnetic head slider (2) deforms and has the role of releasing the force.
– pressed with a constant load. The floating amount is determined by the balance between this load and the generated dynamic pressure. When the disk is stopped, before the disk stops running, that is, when the rotational speed of the disk becomes below a predetermined value, the voltage of the bimorph element (11) is reduced to remove the load on the magnetic head slider (2), and the magnetic head slider (2) is stopped. ) to the position parallel to the leaf spring (lO) and pull it away from the magnetic disk (1).

In this way, in this embodiment as well, the magnetic head slider (2) does not come into contact with the magnetic disk (1) when the disk starts, stops, or stands still, so friction, wear, and adhesion can be avoided, and the magnetic head slider can be lowered. It is possible to increase the flying height and increase the recording density of the magnetic disk device [Effects of the Invention] As described above, according to the present invention, the support arm that is disposed with a gap between the medium and the support arm that moves the magnetic head slider;
A recess formed in this support arm, and a recess provided in this recess, and a
When the medium is stopped and the traveling speed of the medium falls below a predetermined value, the magnetic head slider is accommodated in the recess, so that the friction between the magnetic head slider and the medium is reduced when the medium is started, stopped, and stationary. Abrasion and adhesion can be avoided, the flying height of the magnetic head slider can be reduced, and the recording density of the magnetic disk device can be increased.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a magnetic head support mechanism according to an embodiment of the present invention, and FIGS. 2 and 3 show the operation of the magnetic head support mechanism shown in FIG. 1 when the magnetic disk is stationary and when it is running, respectively. FIG. 4 is a cross-sectional view showing a magnetic head support mechanism according to another embodiment of the present invention, and FIG. 5 is a configuration diagram showing a conventional magnetic head support mechanism. In the figure, (1) is a magnetic disk, <2) is a magnetic head slider, (3) is a suspension, (4) is a support arm, (6) is a recess, <7) is an air reservoir, (8) is a pin, (9> is a protrusion, 10) is a leaf spring, (11) is a bimorph element, (12a) and (12b) are gimbals, (
13) is a membrane. Note that the same reference numerals in each figure indicate the same or corresponding parts. Representative Masuo Iwa Figure 1 2: Head slider 4: Support 7-m 6: Recess 13: Membrane

Claims (1)

[Claims] a support arm disposed with a gap between the medium and the magnetic head slider for moving the magnetic head slider; a recess formed in the support arm;
and a magnetic head slider provided in the recess, which has a mechanism that stores the magnetic head slider in the recess until the medium runs at a predetermined speed when starting, and when the medium travels at a predetermined speed or less when stopped. Head support mechanism.