JPH0991643A - Magnetic head moving mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize a float amount of a magnetic head from a disk surface and a recording/reproducing characteristic by loading the magnetic head on a central part of a head support plate. SOLUTION: A magnetic head moving mechanism 10 is provided with an arm part 4 holding the magnetic head 6 by one end part and making the other end part a turn fulcrum and a drive means 3 driving the magnetic head 6 reciprocally along the radial direction of a magnetic disk 20. The arm part 4 is constituted of two pieces of arm members 4a, 4b arranged in parallel at a prescribed interval and a head support plate 7 loaded on the turn end parts A, B of the members 4a, 4b rotatably and in parallel in the radial direction of the magnetic disk 20. The magnetic head 6 is loaded on the central part of the head support plate 7 in the direction that a mean of skew angles for respective tracks becomes minimum to be arranged on the magnetic disk 20. Further, the magnetic head 6 is loaded between the turn end parts A, B of the arm members 4a, 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head moving mechanism, and more particularly to a magnetic head moving mechanism using a rotary actuator.

[0002]

2. Description of the Related Art In a disk device, it is desirable that the relative angle (skew) between the head direction for recording and reproducing and the data track direction is as small as possible. In order to achieve such an object, a conventional head moving mechanism has been roughly classified into a linear type and a rotary type.

Of these, the linear actuator has a sliding arm on which a head is mounted. This arm is arranged along the radial direction of the disk (that is, perpendicular to the data track), and the slider can slide to move the head in the radial direction of the disk without causing a change in skew.

On the other hand, the rotary actuator is provided with a single rotatable arm 54, as shown in FIG.
A rotating shaft 53 driven by a motor is provided at one end of the arm 54.
Is connected, and the head holder 55 and the head 56 are attached to the other end.
Is attached. This head 56 has an arm 54
By the rotation of the
A, 51b or 51c is moved to and a desired recording / reproducing operation is performed. The rotary actuator shown in FIG. 3 has the advantages that it has a simple structure, is much lighter in weight than a linear actuator, and can move a track at high speed.

[0005]

However, among the above-mentioned conventional examples, the linear actuator requires a plurality of roller bearings or the like to hold the arm, and these bearings cause undesired inertia in the drive device. There was the inconvenience of giving a frictional force. In addition to the inconvenience of increasing the inertial mass and the inconvenience of shortening the access time, there is also the inconvenience of increasing the size of the device.

On the other hand, in the rotary actuator,
As the arm 54 rotates, the head 56 and the recording track 51
The skew angle between a, 51b, and 51c changes greatly. Therefore, for example, in a plural type head in which a reproducing operation is performed by a magnetoresistive effect element and a recording operation is performed by an inductive head, the positions of both heads on the track are deviated due to the fluctuation of the skew angle, and the recording / reproducing signal of the track data is generated. Alternatively, there is an inconvenience that causes deterioration of recording / reproducing characteristics of the device such as deterioration of servo characteristics. Further, since the fluctuation of the skew angle is closely related to the fluctuation of the flying posture of the head (particularly the roll angle), there is also a disadvantage that the head and the disk come into contact with each other and cause damage due to a large deterioration of the flying height.

Here, Japanese Patent Laid-Open No. 59-28216 discloses a head moving mechanism for suppressing the fluctuation of the skew angle. The invention described in this publication adopts a configuration in which a linear movement mechanism is formed in the ring mechanism. However, in reality, since a relatively large number of additional components are required, there is a disadvantage that the actuator is correspondingly increased in size and access time is increased.

Further, although the change in skew angle can be reduced by optimizing the position of the head 56 and the size of the arm 54, a large capacity which is required to improve the track density and narrow the head / disk spacing. In the disk device, it is necessary to further reduce the fluctuation range of the skew angle.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic head moving mechanism for improving the disadvantages of the above conventional example, and more particularly, for providing a magnetic head moving mechanism having a small change width of the skew angle between the head and the data track.

[0010]

According to a first aspect of the present invention, there is provided an arm portion for holding the magnetic head at one end and having the other end as a rotation fulcrum, and the magnetic head is arranged along the radial direction of the magnetic disk. It is equipped with a drive means that drives the motor to reciprocate freely. Of these, at least two arm members arranged parallel to each other at a predetermined interval and arm portions are rotatably mounted parallel to the radial direction of the magnetic disk at the rotating end of each arm member. In addition to the head supporting plate, the other end of each arm member is rotatably mounted on the magnetic disk apparatus main body in parallel with the radial direction of the magnetic disk.

For this reason, in the present invention, the figure in which each rotating end portion and each other end portion of at least two arm members mounted in the radial direction of the magnetic disk are connected by a line is always parallel four sides regardless of the skew angle. Take shape.

According to a second aspect of the invention, the magnetic head comprises:
The head support plate is equipped in the center of the structure.

According to the third aspect of the invention, the driving means is connected to the end of one arm member.

The above aims to achieve the above-mentioned object.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.
It will be described with reference to FIG.

The magnetic head moving mechanism 10 shown in FIG. 1 is provided with an arm portion 4 which holds the magnetic head 6 at one end and uses the other end as a rotation fulcrum, and moves the magnetic head 6 in the radial direction of the magnetic disk 20. A driving means 3 is provided for driving so as to reciprocate along the driving means 3. The arm portion 4 includes at least two arm members 4a and 4b arranged in parallel at a predetermined interval.
And a head support plate 7 rotatably mounted on the rotating ends A and B of the arm members 4a and 4b and parallel to the radial direction of the magnetic disk 20. Also,
The other end portions O and C of the arm members 4a and 4b are mounted on the main body of the magnetic disk 20 rotatably in parallel with the radial direction of the magnetic disk 20.

More specifically, in the present embodiment, the magnetic head 6 is mounted on the magnetic disk 20 in such a direction that the average skew angle for each track is minimized in the central portion of the head support plate 7. ing. The magnetic head 6 is mounted between the rotating ends A and B of the arm members 4a and 4b.

The arm members 4a and 4b are set to have the same length. Of these, the arm member 4a
The other end O of is connected to the rotating shaft of the driving means 3.
Here, the drive means 3 is a stepping motor or the like that rotates the other end O of the arm member 4a. On the other hand, the other end portion C of the arm member 4b is freely rotatable at a position where the line segment connecting the rotating end portions A and B and the line segment connecting the other end portions O and C are parallel and at the same distance. It is fixed. For this reason, as shown in FIG. 2, the figure connecting the rotating ends A and B and the other ends O and C forms a parallelogram regardless of the rotating angle of the arm 4.

On the other hand, the magnetic disk 20 is rotatably driven by the drive shaft 2 located at the center of the magnetic disk 20. Reference numeral 1a indicates the outermost track, and reference numeral 1c indicates the innermost track.

Next, the overall operation of this embodiment will be described with reference to FIG. In the following description of the operation, the arm member 4
The other end O of a is the origin, and the straight line connecting the other end O and the other end C of the arm 4b is the X axis. Further, the axis passing through the origin O and perpendicular to the X axis is defined as the Y axis. Each axis is positive in the upward and rightward directions in the figure.

When performing an operation such as recording / reproducing, the arm member 4a is biased by the rotation of the driving means 3 and is rotated about the origin O. Here, for example, when the arm member 4a rotates counterclockwise in the drawing, the head support plate 7 on which the magnetic head 6 is arranged is moved in the -X direction. At this time, the movement of the head support plate 7 is restricted by the arm member 4b, and the quadrangle OABC always maintains the parallelogram. Therefore, the head support plate 7 is always moved in the -X direction while being kept parallel to the X axis.

As described above, according to this embodiment, the two arm members 4 mounted in the radial direction of the magnetic disk 20 are provided.
The figures in which the rotating ends A and B of the a and 4b and the other ends O and C are connected by a line always form a parallelogram regardless of the rotating angle, and the head support plate 7 is always oriented toward the magnetic disk. Since it is maintained in the specific radial direction of 20, it is possible to effectively suppress the inconvenience that the skew angle largely changes according to the rotation angle as in the conventional rotary actuator composed of a single arm. As a result, it is possible to improve the recording / reproducing characteristics and the servo characteristics without increasing the size of the actuator and increasing the access time, suppressing the occurrence of recording / reproducing errors and improving the reliability of the magnetic disk device. it can.

Further, since the magnetic head 6 is mounted on the central portion of the head support plate 7, the flying height of the magnetic head 6 from the disk surface can be stabilized, and the recording / reproducing characteristics can be further stabilized.

Further, the driving means 3 is connected to one arm member 4a.
Since it is connected to the end O of the actuator, the necessary driving means can be integrated, and the actuator can be prevented from increasing in size.

Here, in the present embodiment, the case where the magnetic head 6 is provided between the rotating ends A and B has been described, but the magnetic head 6 is provided outside the rotating ends A and B. It may be equipped. In particular, when the magnetic head 6 is mounted on the inner peripheral side of the head support plate 7, the recordable and reproducible area of the magnetic disk 20 can be widely used. Further, the magnetic head moving mechanism 10 of the present embodiment is suitable not only for magnetic disks but also for recording / reproducing of optical disks by an optical head. Furthermore, three or more parallel arm members may be provided. In addition, it is preferable that the arm member is as long as possible, considering only the aspect of suppressing the skew angle variation. The driving means 3 may be connected to the other end C of the arm member 4b.

[0026]

Since the present invention is constructed and functions as described above, according to the present invention, each rotating end and each other end of at least two arm members mounted in the radial direction of the magnetic disk are lined. The shape connected by is always parallelogram regardless of the skew angle, and the head support plate is always maintained in the specified radial direction of the magnetic disk, so it can be rotated like a conventional single-arm rotary actuator. It is possible to effectively suppress the inconvenience that the skew angle largely changes depending on the moving angle, and thereby improve the recording / reproducing characteristics and the servo characteristics without increasing the size of the actuator and increasing the access time. Therefore, it is possible to suppress the occurrence of a recording / reproducing error and improve the reliability of the magnetic disk device.

According to the second aspect of the present invention, since the magnetic head is provided at the center of the head support plate, the flying height of the magnetic head from the disk surface can be stabilized and the recording / reproducing characteristics can be further stabilized. it can.

According to the third aspect of the invention, since the driving means is connected to the end of one arm member, the necessary driving means is integrated, and it is possible to prevent the actuator from becoming large. An excellent magnetic head moving mechanism can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the magnetic head moving mechanism shown in FIG.

FIG. 3 is a schematic configuration diagram showing a conventional example.

[Explanation of symbols]

 3 Drive Means 4 Arms 4a, 4b Arm Members 6 Magnetic Head 7 Head Support Plate 10 Magnetic Head Moving Mechanism 20 Magnetic Disks A, B Rotating Ends O of Arm Members C, Other Ends of Arm Members

Claims (3)

[Claims] 1. An arm portion having one end for holding a magnetic head and the other end serving as a rotation fulcrum, and drive means for driving the magnetic head so as to be reciprocally movable in a radial direction of a magnetic disk. In the magnetic head moving mechanism, the arm portion includes at least two arm members arranged in parallel with each other at a predetermined interval, and the arm portion is rotatably attached to a rotating end portion of each arm member and in a radial direction of the magnetic disk. And a head support plate mounted parallel to the magnetic disk, and the other end of each arm member is rotatably mounted parallel to the radial direction of the magnetic disk on the main body of the magnetic disk. A magnetic head moving mechanism characterized by. 2. The magnetic head moving mechanism according to claim 1, wherein the magnetic head is mounted on a central portion of the head support plate. 3. The magnetic head moving mechanism according to claim 1, wherein the driving means is connected to an end of one arm member.