JPH10320935A - Magnetic disk apparatus and method for starting the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic disk apparatus and a method for starting the same, whereby a floating posture of a head at a CSS(contact start stop) time is stabilized and a start torque can be reduced. SOLUTION: A slider 3 is positioned at a CSS zone set at an innermost circumference of a magnetic disk 2. Simultaneously when the magnetic disk 2 is started rotating, a position of a rotational arm 5 is regulated by an arm stopper 7 to move the slider 3 to a position R0 where a YAW (yaw) angle becomes 0 deg.. The slider 3 is confined at the position until the magnetic disk 2 makes a stationary rotation. Since the YAW angle of the slider 3 is held at 0 deg. until the stationary rotation of the magnetic disk 2, a float posture of the slider 3 is stabilized. Since the CSS zone is located at the innermost circumference, a start torque is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly, to stabilizing the flying attitude of a magnetic head slider,
The present invention relates to a magnetic disk drive capable of reducing a starting torque and a starting method thereof.

[0002]

2. Description of the Related Art In a conventional magnetic disk drive, as shown in FIG. 4, a magnetic head slider (hereinafter, referred to as slider) 3 mounted on a rotating arm 5 performs contact start / stop (hereinafter, referred to as CSS). A radial position (hereinafter, referred to as a CSS zone) needs to be set at a radial position on the magnetic disk 2, but is generally set at the innermost circumference Rin of the magnetic disk 2. One of the reasons is that the starting torque at the time of starting the magnetic head is small because the distance from the center of the spindle shaft to the CSS zone where the head is stopped is smaller at the innermost circumference.

However, when the CSS zone is set at the innermost position, as shown in FIG.
Performs the CSS in a state having the innermost YAW (yaw) angle θin of the magnetic disk 2. For this reason, until the magnetic disk 2 reaches the steady rotation, the air bearing of the slider 3 has a poor balance due to the fluctuation of the air flow caused by the fluctuation of the rotation speed of the magnetic disk 2 and the flying posture of the slider 3 is unstable. Therefore, there is a problem that damage is caused by contact between the slider 3 and the magnetic disk 2. Although this differs depending on the shape of the air bearing surface, usually when designing the air inflow end of the slider 3, the slider YAW which is perpendicularly opposed to the rotation direction of the magnetic disk 2 is used.
Since a method is adopted in which the conditions are optimized on the inner and outer circumferential sides from the position R0 of the angle 0, the flying condition of the slider 3 at the innermost circumference where the YAW angle is the largest is the YAW angle 0. This is because it is worse than the state.

For this reason, conventionally, a technique has been proposed in which a CSS zone is set at a position R0 at which the YAW angle becomes 0 degrees. For example, there are JP-A-4-248176 and JP-A-4-212765. According to these techniques, since the YAW angle is 0, the instability of the flying attitude as described above is reduced, and damage due to contact between the slider and the magnetic disk can be reduced.

[0005]

However, on the other hand, the CSS zone is set at a position near the middle of the magnetic disk in the radial direction, so that the distance from the center of the spindle shaft to the CSS zone is increased as described above. And the starting torque when starting the magnetic head is increased. Further, if the position of the YAW angle 0 is set to the innermost peripheral position, the YAW angle on the outer peripheral side becomes large, and a problem occurs in the balance between the inner peripheral region and the outer peripheral region. Thus, in the conventional magnetic disk drive,
There has been a problem that stabilization of the flying attitude of the slider and reduction of the starting torque cannot be simultaneously satisfied.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk drive and a method of starting the same, which stabilize the head flying attitude during CSS and reduce the starting torque.

[0007]

According to the magnetic disk drive of the present invention, the CSS zone of the slider is set at the innermost position of the magnetic disk, and the magnetic disk drive is rotated from the start of rotation to the steady rotation. Means is provided for restraining the slider at a position where the YAW angle becomes 0 degrees. For example, the position restricting means is disposed at a position near the slider, and controls the rotation of the rotating arm on which the slider is mounted so that the YAW angle becomes 0 from the start of rotation of the magnetic disk to the steady rotation.
It is composed of an arm stopper that locks at a position where it is in the right position.

Further, according to the starting method of the present invention, the slider is positioned in a CSS zone set at the innermost peripheral position of the magnetic disk, and the YAW angle of the slider becomes zero at the same time when the magnetic disk starts rotating. And the magnetic disk is constrained to the moving position until the magnetic disk reaches a steady rotation. For this reason, the YAW angle of the slider is maintained at 0 degrees until the magnetic disk rotates steadily, so that the flying posture of the slider can be stabilized, and the starting torque is reduced because the CSS zone is the innermost circumference.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a magnetic disk drive according to an embodiment of the present invention. This magnetic disk drive is rotated at a high speed by a schematically shown spindle motor 1 to record information on the magnetic disk 2, and is moved in a radial direction with respect to the magnetic disk 2 to record information on the magnetic disk 2. A slider (air bleeding head slider) 3 for reproduction; The slider 3 is mounted on the tip of a rotary arm 5 that swings in the radial direction of the magnetic disk 2 about a rotary shaft 4. The rotation arm 5 is provided with a rotation positioning mechanism 6 for rotating the rotation arm 5 in the above-described radial direction. As the rotation positioning mechanism 6, for example, a known means such as a voice coil motor is used.

The rotary arm 5 is provided on the magnetic disk 2.
An arm stopper 7 for regulating the rotational position is provided on the device base on the side that is turned in the outer diameter direction.
Here, the arm stopper 7 is formed of a solenoid plunger, and is configured such that when the solenoid coil 7a is energized, the plunger 7b projects toward the inner diameter direction of the magnetic disk 2. And
When the plunger 7b is protruded by energization, the tip end of the plunger 7b is opposed to the outer surface of the rotating arm 5, and the arm stopper 7 comes into contact with the rotating arm 5 that has been rotated in the outer diameter direction. It can contact and be fixed at that position.

The spindle motor 1, the rotation positioning mechanism 6 and the arm stopper 7 are electrically connected to a control circuit 8, and the control signal output from the control circuit 8 drives the spindle motor 1 to rotate. The arm 5 is rotated, and the energization of the arm stopper 7 is controlled. The control circuit 8 includes the spindle motor 1 or the magnetic disk 2.
The rotation speed sensor 9 for detecting the rotation speed of the magnetic disk 2 is connected, and a detection signal of the rotation speed of the magnetic disk 2 is input.

Here, the rotating arm 5 includes a slider 3
Are set at the innermost peripheral position of the magnetic disk 2. The position of the arm stopper 7 at which the rotary arm 5 is stopped when the plunger 7b is protruded is the position of the slider 3 mounted on the rotary arm 5.
Is the radius R at which the YAW angle is 0 degree with respect to the magnetic disk 2.
It is set to 0.

The operation of the magnetic disk drive having the above configuration will be described with reference to FIGS. FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a timing chart for explaining the operation. In the initial state, as shown by the line A in FIG. 2, the spindle motor 1 is stopped, and at this time, the slider 3 is at the CSS position. When the rotation of the spindle motor 1 is started by a start signal from the control circuit 8, power is simultaneously supplied to the arm stopper 7 by a control signal from the control circuit 8, and the plunger 7b is protruded. In addition, the rotation positioning mechanism 6 is driven by a control signal from the control circuit 8, whereby a force is applied to the rotating arm 5 in the outer circumferential direction about 0.1 to 2 seconds immediately after the spindle motor 1 is started, and the outer circumferential direction is applied. Is rotated. When the outer surface of the rotary arm 5 comes into contact with the tip of the plunger 7b of the arm stopper 7, the rotary arm 5 is stopped at the position B. This stop position is a position where the YAW angle of the slider 3 is 0 degrees as described above.

Next, the control circuit 8 to which the detection output of the rotation speed sensor 9 is input monitors the rotation speed of the magnetic disk 2 and holds the above-mentioned state until the magnetic disk 2 reaches a steady rotation state. Then, the slider 3 is restrained at the position described above. When the control circuit 8 confirms that the magnetic disk 2 has reached the steady rotation, the control circuit 8 stops energizing the arm stopper 7. As a result, the plunger 7b is retracted from the arm stopper 7, and the restraint of the rotating arm 5 is released, so that the rotating arm 5 is in a free state.

As described above, in this embodiment, the rotation of the rotary arm 5 is restrained by the arm stopper 7 and the slider 3 is moved to the YAW angle 0 until the magnetic disk 2 reaches the steady rotation.
, The flying attitude of the slider 3 can be stably maintained, and damage due to contact between the slider 3 and the magnetic disk 2 can be effectively prevented. On the other hand, since the CSS position of the slider 3 is set to the innermost position of the magnetic disk 2, the starting torque can be reduced, and the slider 3 is positioned at a position where the YAW angle becomes zero. In this case, since the magnetic disk 2 has already reached the steady rotation, the starting torque is hardly affected.

Here, in the above-described embodiment, the solenoid plunger is used as the arm stopper, but a stopper mechanism having another configuration may be used. In the above embodiment, the rotation arm is moved to YA using the arm stopper.
Although it is constrained to the position of W angle 0, it is also possible to use the positioning function of the rotation positioning mechanism to rotate the rotation arm and to fix the rotation arm to the position of YAW angle 0 at startup. It is. It should be noted that a rotary solenoid, a stepping motor, or the like may be used as the rotary positioning mechanism in addition to the voice coil described above.

[0017]

As described above, according to the present invention, the slider is kept at a YAW angle of 0 until the magnetic disk reaches a steady rotation.
, The balance of the air bearing is improved, and the flying attitude of the slider can be stabilized. On the other hand, since the CSS is set at the innermost circumference of the magnetic disk, the starting torque can be reduced. As a result, it is possible to simultaneously stabilize the flying attitude of the slider and reduce the starting torque.

[Brief description of the drawings]

FIG. 1 is a plan view showing the overall configuration of an embodiment of a magnetic disk drive according to the present invention.

FIG. 2 is a plan view of a main part for explaining the operation of the magnetic disk drive of FIG. 1;

FIG. 3 is a timing chart for explaining the operation of the magnetic disk shown in FIG. 1;

FIG. 4 is a plan view for explaining a conventional magnetic disk drive.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle motor 2 Magnetic disk 3 Slider 5 Rotating arm 6 Rotation positioning mechanism 7 Arm stopper 8 Control circuit 9 Rotation speed sensor

Claims (4)

[Claims] 1. A magnetic disk drive comprising: a magnetic disk rotated at a high speed; and a magnetic head slider moved in a radial direction of the magnetic disk to record / reproduce information on / from the magnetic disk. The contact start / stop position is set to the innermost position of the magnetic disk, and the YAW (yaw) angle of the magnetic head slider is set to 0 between the start of rotation of the magnetic disk and the steady rotation. A magnetic disk drive comprising means for restraining the magnetic disk device at a position where the magnetic disk device is at a desired position. 2. The rotary arm according to claim 1, wherein the position restricting means is disposed at a position near the magnetic head slider, and includes a rotary arm on which the magnetic head slider is mounted during a period from a start of rotation of the magnetic disk to a steady rotation. 2. The magnetic disk drive according to claim 1, further comprising an arm stopper that locks rotation at a position where the YAW angle becomes 0 degree. 3. The position restricting means comprises a rotation positioning mechanism for controlling a rotation position of a rotation arm on which the magnetic head slider is mounted, and the rotation from a start of rotation of the magnetic disk to a steady rotation. 2. The magnetic disk drive according to claim 1, wherein control is performed such that the magnetic head slider is positioned at a position where the YAW angle becomes zero. 4. A magnetic disk drive comprising: a magnetic disk rotated at a high speed; and a magnetic head slider moved in a radial direction of the magnetic disk to record / reproduce information on / from the magnetic disk. Is set to the innermost position of the magnetic disk, and at the same time as the magnetic disk starts rotating, the magnetic head slider is moved to a position where the YAW angle becomes 0 degree, and the magnetic disk reaches a steady rotation. A method for starting the magnetic disk drive, wherein the magnetic disk drive is constrained to the movement position until the movement is completed.