JPH0620417A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent an adsorption phenomenon of a magnetic head to a medium at the start-up time and a damaging accident of the magnetic head, which is apt to occur at the start-up time. CONSTITUTION:The device is provided with the medium 1 to be energized to rotate by a driving motor, a magnetic head 2 for recording and reproducing information and a suspension 3 for holding this magnetic head and giving it a load, where the suspension 3 is supported via an actuator arm 4. Then, the device is composed of a positioning mechanism for positioning the magnetic head 2 into a prescribed position on the medium 1 by turning this suspension on a circular arc, a stranding table 6 disposed in the vicinity of the outer periphery of the medium 1 for the purpose of separating the magnetic head from the medium 1 at the time of withdrawing the magnetic head 2 and a block 5 for stranding the actuator arm 4 on the stranding table 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to a retracting mechanism for a magnetic head used in the magnetic disk device.

[0002]

2. Description of the Related Art Generally, in a magnetic disk device, when a magnetic recording medium (hereinafter referred to as medium) is stopped, a magnetic head is pressed against the surface of the magnetic recording medium by pressing a suspension. Therefore, the medium and the magnetic head are in contact with each other until the magnetic disk drive operates and the medium starts to rotate until the number of rotations of the medium reaches the speed at which the medium generates a sufficient supporting force of the air bearing for the magnetic head. . Also, when the magnetic disk device stops and the rotation speed of the medium drops below the rotation speed that generates the air bearing,
The magnetic head and the medium come into contact again.

In such a magnetic disk device, in order to prevent damage to the magnetic head and the medium at the time of starting and stopping,
The liquid lubricant is applied to the medium surface, has high medium surface accuracy and magnetic head slider surface accuracy, and the surface lubricant is applied to the medium surface. Therefore, an adsorption phenomenon occurs between the medium and the magnetic head.

Conventionally, with respect to the attraction between the medium and the magnetic head, the peeling is forcibly performed by applying a large current to the drive motor for rotating the medium. in this way,
Since a large amount of current is applied, power consumption is large, and the medium and the magnetic head may be damaged due to forcible peeling, resulting in damage.

In order to solve these problems, as shown in FIG. 3, a magnetic head 2 in which a medium 1 is attached to an actuator arm 4 via a suspension 3a.
In order to avoid contact between the medium 1 and the magnetic head 2 until the rotation to generate a sufficient air bearing levitation force is reached, the horizontal portion of the suspension that applies the pressing force is placed near the outer periphery of the medium 1. There is also a magnetic disk device provided with a mechanism for riding on a riding platform 6 having an inclination angle provided.

[0006]

However, in the above-mentioned method, the friction between the suspension and the riding platform is large, and a large force is required for the suspension to climb up to a predetermined position. In particular, a plurality of discs are used. In this case, there is a drawback that the magnetic head cannot be retracted.

[0007]

According to the present invention, there is provided a magnetic recording medium which is rotated by being biased by a drive motor, a magnetic head which records and reproduces information, and a suspension which holds the magnetic head and applies a load thereto. A positioning mechanism for supporting the suspension via an arm and rotating the arm in an arc shape to position the magnetic head at a predetermined position on the magnetic recording medium; and a positioning mechanism disposed near the outer periphery of the magnetic recording medium. In a magnetic disk device, wherein the arm includes a riding platform for separating the magnetic head from the magnetic recording medium when the magnetic head is retracted, the arm has a pulley for riding on the riding platform. .

Further, the pulley may be a gear, and the arm may have a rack that engages with the gear. Further, a part of the pulley may be flat.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIGS. 2A to 2C are sectional views showing the operating states of the magnetic heads of the first to third inventions. 1 and 2
An embodiment of the first invention shown in (a) is a medium 1 that is rotated by being biased by a drive motor, a magnetic head 2 that records and reproduces information, and a suspension 3 that holds the medium and applies a load. And a positioning mechanism (not shown) for supporting the suspension 3 via the actuator arm 4 and rotating the suspension 3 in an arc shape to position the magnetic head 2 at a predetermined position on the medium 1, and an outer periphery of the medium 1. The riding platform 6 arranged in the vicinity and the pulley 5 for the actuator arm 4 to ride on the riding platform 6 are configured.

As a result, when the magnetic disk device is stopped, the actuator arm 4 rides on the carriage 6 and separates the magnetic head 2 from the medium 1. And
When the magnetic disk device operates, the actuator arm 4 is detached from the riding table 6 and levitated and positioned on the surface of the medium 1. At this time, since the pulley 5 is attached to the actuator arm 4, the movement to the platform 6 becomes easy.

Next, in one embodiment of the second invention shown in FIG. 2 (b), the pulley 5 shown in FIG. 2 (a) is used as a pulley (gear) 5a, and the carriage 6a is provided with this pulley. (Gear) 5a
A rack (gear) provided with a rack for engaging with
This is to prevent the sliding of 5a when it moves (mounts) to the platform 6.

Further, an embodiment of the third invention shown in FIG. 2 (c) comprises a pulley 5c shown in FIG. 2 (a) in which a flat portion is provided on a part of the pulley 5. The flat portion of the pulley 5c of the actuator arm 4 is brought into contact with the platform 6 so that the actuator arm 4 can be stopped at a predetermined position on the platform 6.

These will be described in more detail. The magnetic head 2
Is placed between the suspensions 3 in order to enable recording / reproduction on the surface of the medium 1 rotating at a speed that generates a sufficient supporting force of the air bearing without contact between the medium 1 and the magnetic head 2. The pulley 5 mounted on the suspension 3 is mounted on the mounted carriage 6, and the magnetic head 2 is mounted on the suspension 3 on the outer circumference of the medium at a certain distance from the surface of the medium at this time. The pulley 5 is fixed by being mounted on the carriage 6.

Next, when the medium 1 starts to rotate and reaches a speed at which the magnetic head 2 generates a sufficient supporting force of the air bearing, the magnetic head 2 and the actuator arm 4 having the suspension 3 move to the medium 1. Pulley 5 mounted on suspension 3 by rotating inward
Rolls on the platform 6, the magnetic head 2 is at a predetermined position on the medium surface, and the pulley 5 mounted on the suspension 3 descends from the platform 6, so that the magnetic head 2 attached to the suspension 3 has a small pressing force. Is loaded on the medium surface by. At this time, since the medium 1 has already reached the rotational speed at which a sufficient supporting force of the air bearing is generated, the magnetic head 2 is in a recordable / reproducible state without contacting the medium 1.

[0016]

As described above, according to the present invention, the pulley is arranged on the suspension, and the pulley moves up and down the platform to damage the medium and the magnetic head at the time of starting and stopping the magnetic disk device, There is an effect that the adsorption phenomenon can be avoided.

[Brief description of drawings]

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

2A to 2C are sectional views showing an operating state of the magnetic head 2 in the first to third inventions.

FIG. 3 is a perspective view showing a conventional example.

[Explanation of symbols]

 1 Medium 2 Magnetic Head 3,3a Suspension 4 Actuator Arm 5,5a-5c Pulley 6,6a Riding Platform

Claims (3)

[Claims] 1. A magnetic recording medium which is rotated by being driven by a drive motor, a magnetic head which records and reproduces information, a suspension which holds this magnetic head and applies a load thereto, and an arm via the arm. A positioning mechanism for supporting the position of the magnetic recording medium and positioning the magnetic head at a predetermined position on the magnetic recording medium by rotating the arm in an arc shape, and the magnetic head retracts near the outer periphery of the magnetic recording medium. At this time, in the magnetic disk device, wherein the arm includes a riding platform for separating the magnetic head from the magnetic recording medium, the arm has a pulley for riding on the riding platform. 2. The magnetic disk drive according to claim 1, wherein the pulley is a gear, and the arm has a rack that engages with the gear. 3. The magnetic disk drive according to claim 1, wherein a part of the pulley is flat.