JPH03127388A - Magnetic head supporting device - Google Patents

Abstract

PURPOSE:To improve the following-up capacity to a disk surface by attaching a slider having a head part to a gimbals and elastically pressing the gimbals by an energizing means to displace the gimbals toward the slider. CONSTITUTION:A slider 9 having a head part 8 is attached to a gimbals 7, and the gimbals 7 is elastically pressed by energizing means 6 and 15 so that the gimbals 7 is displaced toward the slider 9. Consequently, the gimbals 7 is always pressed to the slider 9 by energizing means 6 and 15, and the gimbals 7 and energizing means 6 and 15 are not separated though the slider 9 is oscillated. Thus, a magnetic head supporting device is obtained which has a high following-up capacity to displacement of the disk surface regardless of oscillation of the disk or an arm.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a support device for a magnetic head that flies above a magnetic disk to record data on the magnetic disk or read data from the magnetic disk. .

2. Description of the Related Art Conventionally, magnetic heads used in hard disk drives generally have a structure in which a head portion for at least one of recording and reproducing data on a magnetic disk is attached to a flying slider. Then, the actuator positions the gap portion of the magnetic head over the target data track on the magnetic disk. A conventional magnetic head support device has a structure in which a flexure is fixed to the tip of an arm that is movable in the radial direction of the disk, and a floating slider is attached to the tip of the flexure. A case where a negative pressure type slider is used in a conventional magnetic head support device will be explained with reference to FIGS. 8 and 9. FIG. 8th
In the figure, 1 is a flexure fixing part, 2 is a flexure attached to the flexure fixing member 1, and is bent near the flexure fixing part 1. 3 is a gimbal fixed to the bottom surface of the end of flexure 2;
It is configured as shown in the figure. FIG. 9 is a perspective view of the gimbal 3. The gimbal 3 is made of a thin metal plate and has a frame portion 3b and a tongue portion 3C. A hemispherical protrusion 3a is formed near the tip of the tongue portion 3c. The frame portion 3b is joined to the flexure 2, and the protrusion 3a
is in contact with flexure 2. 4 is a negative pressure type slider joined to the tongue portion 3c.

The operation of the conventional magnetic head support device configured as described above will be described below. When the disk is at rest, the slider 4 is placed a certain distance away from the disk.

After the disc has reached steady rotation, press the flexure 2 against the disc with a haircut unit, etc., and bring it close to the disc until it reaches a predetermined distance, and the slider 4
A force that sticks to the disc, that is, negative pressure, acts on it. When the slider 4 is brought even closer to the disk, positive pressure is generated between the disk and the slider. When this negative pressure is in balance with the restoring force of the flexure 2 and the positive pressure, the slider 4 is maintained at a very small distance from the disk (hereinafter this state is referred to as floating). When undulation occurs in the disk during rotation, the protrusion 3a that is in contact with the flexure 2
The disc freely moves around the center and adapts to the undulations of the disc. When the rotational speed of the disk decreases, the flow velocity of air near the disk following the magnetic disk decreases, and the negative pressure weakens accordingly.When the restoring force of the flexure 2 overcomes the negative pressure of the slider 4, the slider moves toward the disk surface. Problems to be Solved by the Invention However, in the conventional configuration described above, when the magnetic head is floating above the disk, the flexure 2 receives a force that tends to move the slider 4 away from the disk surface. Also, since a force is acting on the slider 4 that attracts it toward the disk, the contact force between the protrusion 3a and the lower surface of the flexure 2 becomes small, and when the disk or flexure 2 vibrates, the protrusion 3a
may separate from or come into contact with the bottom surface of flexure 2, at which time the slider will be unable to follow the fluctuations of the disc and the slider and disc will collide.
There was a problem that the disc could be damaged in some cases.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a magnetic head support device that can highly follow the displacement of the disk surface even when disk vibration or arm vibration occurs.

Means for Solving the Problems In order to achieve this object, the slider has a configuration in which a gimbal is attached to a slider having a head portion, and the gimbal is pressed by a biasing means so as to move toward the slider.

Function: Due to this, the gimbal is always pressed toward the slider by the biasing means, and even if the slider vibrates, the gimbal and the biasing means will not separate.

Embodiment FIGS. 1 and 2 are a perspective view and a side view showing a magnetic head support device according to an embodiment of the present invention. In FIGS. 1 and 2, 5 is a flexure fixing part, 6 is a flexure which is fixed to the flexure fixing part 1 and is made of a leaf spring, and the flexure 6 is provided with a through hole 6a. A gimbal 7 has a protrusion 7a near the center and is provided on the flexure 6 so as to close the through hole 6a.A magnetic head 8 shown in FIG. 3 is attached to this gimbal 7. FIG. 3 is a perspective view showing the magnetic head 8.
In FIG. 3, 9 is a negative pressure type slider made of a magnetic material, 10.11 is a magnetic core, and magnetic core 10.
Gap fillers 12 and 13 serving as magnetic gaps are filled between the slider 11 and the negative pressure type slider 9, respectively.

The magnetic core 10 also has a winding 14 . The negative pressure type slider 9 has a recess 9a, and the recess 9a generates a negative pressure by the air flow generated on the surface of the disk rotating at high speed, and the slider is attracted to the disk surface by the negative pressure. Then, positive pressure is generated on the convex portion 9b. 15 is a flexure, and the flexure 15 is a flexure fixing member 5
The protrusion 7a is fixed to the magnetic head 8 and urges the protrusion 7a toward the magnetic head 8.

The flexure 6 is bent near the flexure fixing member 5. Further, the flexure 15 is bent near the flexure fixing member 5. The elastic coefficient of flexure 6 is set to be larger than that of flexure 15, and flexure 6 and flexure 15
When the magnetic head 4 is fixed with the 7 reflexion fixing part l, the magnetic head 4 is separated.

In the embodiment shown in FIGS. 1 and 2, the force applied to the magnetic head when the slider is floating will be explained. The flexure 6 is set to have a force of 10 gf in the direction of moving the magnetic head 8 away from the disk. In addition, the flexure 15 is oriented 7 in the direction of bringing the magnetic head 8 closer to the disk.
It is set to have the resiliency of gf. In other words, a force of 3 gf is applied to the magnetic head 8 from the flexure 6 in the direction away from the disk. Further, a negative pressure and a positive pressure are acting on the slider 9, and the resultant force of these two forces is the same in magnitude as 3gf generated by both flexures, and the direction of the resultant force is opposite. In such a case, the magnetic head 4 flies a predetermined distance from the disk, and during the flying, the protrusion 3a comes into contact with the flexure 15 with a force of 7 g. Even if vibration of the disk surface or vibration of the arm occurs due to this contact force, the protrusion 7a will always maintain approximately 7 gf.
The magnetic head 8 is in contact with the flexure 15 by force and does not separate from the flexure 6, and the magnetic head 8 can always perform rolling and pitching movements around the protrusion 7a. Head 8 follows well.

FIG. 4 is a perspective view showing another embodiment of the present invention. Fourth
In the figure, 16 is a flexure fixing part, 17 is a flexure fixed to the flexure fixing part 16, and made of a leaf spring, and the flexure 17 is provided with a through hole 17a. 18 has a protrusion 3a near the center, and the through hole 1
The gimbal is attached to the flexure 17 so as to close the flexure 7a, and a slider 8 shown in FIG. 4 is attached to one side of the gimbal 18. 19 is a biasing member, and the biasing member 19 is constructed as shown in FIG. FIG. 5 is a perspective view showing the biasing member 19, and in FIG.
9a is a joint portion, and the joint portion 19a is joined to the flexure 17 by spot welding or the like. 19b is a tongue portion having a protrusion 19c at its tip, and the tongue portion 19b is integrally bottom-shaped with the joint portion 19a. Biasing member 19 configured in this way
is attached to the side of the flexure 17 where the magnetic head 4 is not provided, so that the protrusion 19c is attached to the gimbal 1.
It abuts on the center part of 8. The flexure 17 is bent near the flexure fixing portion 16. With such a configuration, the magnetic head 8 is always pressed against the gimbal 1 by the biasing member 19.
Since the protrusion 19 is pushed toward the disk through the protrusion 8, even if the disk or flexure vibrates,
c never separates from the flexure 17, and the magnetic head 8 can always perform rolling and pitching movements around the protrusion 19c, so it can follow the waviness of the disk well.

FIG. 6 is a sectional view showing another embodiment of the present invention. 6th
In the figure, 5 is a flexure fixing part, 6 is a flexure, and 7 is a flexure fixing part.
1 is a gimbal, 7a is a protrusion, 8 is a magnetic head, and 15 is a flexure, which are the same as the embodiment shown in FIG.

Reference numeral 20 denotes a tongue-shaped flexure pressing member made of a shape memory alloy and fixed to the flexure fixing portion 5 . FIG. 7 is a perspective view of the flexure pressing member 20. The shape of the flexure pressing member 20 is memorized so as to displace the flexure 6 toward the disk when the flexure pressing member 20 returns. The shape is restored by passing an electric current through the shape memory alloy itself and generating heat due to this electric current. When the shape is restored, the flexure pressing member 20 is in contact with the flexure 6 at the contact point 20a, and is in contact with the flexure 15 at the contact point 20b. If flexure 15 is not present, flexure 6 is present at contact 20a.
At the same time, the repulsive force acts to move the 7 lever pressing member 2 toward the disk in the direction of arrow A shown in FIG.
0 itself transforms. Therefore, the force acting on the contact point 11a decreases, and the amount of displacement of the flexure 6 decreases. However, as in this embodiment, flexure 6 and flexure 1
When the flexure pressing member 20 is provided between the contact point 2 and the
It contacts the flexure 15 at 0b. By contacting the flexure 15, the flexure pressing member 20 becomes difficult to deform in the direction of the arrow.
It is possible to concentrate the force generated at the contact point 20a to bring the flexure closer to the disk, and the amount of displacement of the flexure 2 can be increased.

Effects of the Invention In the present invention, a gimbal is attached to a slider having a head portion, and the gimbal is pressed so as to be displaced toward the slider by a biasing means, so that the slider always moves toward the biasing means disk via the gimbal. Since the protrusion is pressed against the flexure, even if the disk or arm part vibrates during levitation, the protrusion will not separate from the flexure. Since the slider always performs rolling and pitching motions around the protrusions, it is possible to maintain high followability even with respect to surface runout and surface undulations of the disk surface.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the invention, FIG. 2 is a side view of the same, FIG. 3 is a perspective view showing a negative pressure magnetic head, and FIG. 4 is a perspective view showing another embodiment of the invention. 5 is a perspective view of the biasing member, and FIG. 6 is a side view showing another embodiment of the present invention.
FIG. 7 is a perspective view of a flexure pressing member, FIG. 8 is a side view of a conventional magnetic head support device, and FIG. 9 is a perspective view of a gimbal used in the conventional magnetic head support device. 5 ・・・・・・ 6 ・・・・・・ 6a・・・・・・ 7 ・・・・・・ 7 a・・・・・・ 8 ・・・・・・ 9 ・・・・・・11 ・・・・・・ 13 ・・・・・・ l 4 ・・・・・・ 15 ・・・・・・ 16 ・・・・・・ 17 ・・・・・・ 17a・・・・・・18 ...... l 9 ...... Flexure fixing part Flexure through hole Gimbal protrusion Magnetic head Negative pressure type slider Magnetic core Gap filler Winding Flexure Flexure fixing part Flexure through hole Gimbal biasing member 19a. ...... 19b... 19c... 20 ...... Joint tongue part projection flexure pressing member

Claims (6)

[Claims] (1) A flexure attached to a fixed member, a gimbal attached to the flexure, a slider attached to the gimbal and having a magnetic head, and a slider having a protrusion at its tip, and the gimbal being attached to the gimbal through the protrusion. A magnetic head support device characterized in that a biasing means is provided for pressing the slider so as to move it toward the slider. (2) The magnetic head support device according to claim 1, wherein the biasing means is attached to the fixed member. (3) The magnetic head support device according to claim 1, wherein the biasing means is attached to the flexure. (4) A flexure attached to a fixed member, a gimbal attached to the flexure and having a slider having a protrusion on one surface and a magnetic head section on the other surface, and a gimbal attached to the gimbal via the protrusion. 1. A magnetic head support device characterized in that a biasing means is provided for pressing the magnetic head so as to shift the magnetic head toward the slider. (5) The magnetic head support device according to claim 4, wherein the biasing means is attached to the fixed member. (6) The magnetic head support device according to claim 4, wherein the biasing means is attached to the flexure.