JPH0325768A - Transducer loading method - Google Patents

Abstract

PURPOSE:To shorten the time until the recording and reproducing are ready by separating a transducer from a recording disk upon stopping the rotation and releasing the transducer from the separation until the rotating state is effective to receive a fluid bearing effect after starting the rotation. CONSTITUTION:A magnetic head is constituted in such a way that when a magnetic disk 1 is rotated, the head is slightly floated off from the surface of the disk 1 to be separated. The head 3 is separated from the surface of the disk 1 by a head supporting means 5 in raising suspensions 7 and 9 by a loading arm 31 when the disk 1 is under the state of stopping its rotation. Then, before reaching the steady rotation after starting the disk 1 to rotate, i.e. before becoming such a rotating state that the head 3 can slightly be floated above the surface of the disk 1 after starting the rotation, the separation by the arm 31 supporting the suspensions 7 and 9 is released. By this method, the head 3 is slid on the surface of the disk 1 under rotation. In this case, no sucking phenomenon takes place because of the rotation at low speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method of loading a transducer for recording and reproducing information on a recording disk, which is a magnetic recording medium.

(Prior Art) As shown in FIGS. 6 and 7, a Winchester type magnetic disk device supports suspensions 7 and 9 having a magnetic head 3 at their tips with a carriage arm 11. The structure is such that the magnetic disk is loaded onto one surface of a magnetic disk, which is a recording disk, by one rotation.

A fixed shaft 7 extending in the vertical direction is installed between the tips of the connecting plates 15, 15 fixed above and below the drive motor 13, and a pair of upper and lower ball bearings is connected around the fixed shaft 17 The carriage boss 21 is rotatably provided,
The carriage arm 11 is rotated around a fixed shaft 17 by the drive motor 13.

Each carriage arm 11 is arranged at regular intervals along the axial direction of the carriage boss 21.
A pair of upper and lower suspensions 7 and 9 are provided at the tip of the magnetic disk 1 to face the upper and lower surfaces of each magnetic disk 1. 23 is a preload spring that presses the outer ring of one of the upper bearings upward on the outer periphery of the fixed shaft 17; 25 is a spring for preloading the drive motor 13, carriage boss 21, and magnetic disk 1;
This is a housing provided to cover the outer periphery of.

In this Winchester type magnetic disk device, when the magnetic disk 1 is not rotating, the magnetic head 3 is in contact with one surface of the magnetic disk, and when the magnetic disk 1 starts rotating, the magnetic head 3 is in contact with one surface of the magnetic disk. When the magnetic head 3 begins to slide on the surface of the magnetic disk and reaches a steady rotation speed of about 173, the magnetic head 3 begins to levitate from the surface of the magnetic disk due to the fluid bearing effect (dynamic pressure effect). When the rotation of the magnetic disk 1 stops,
As the rotational speed decreases, the flying height of the magnetic head 3 decreases, and finally it lands on the surface of the magnetic disk.

The flying and landing of the magnetic head 3 on the magnetic disk 1 is generally referred to as CSS (Contact S).
tartstop). While the magnetic head 3 is sliding over the surface of the magnetic disk, the magnetic disk 1 suffers some damage, but by employing an appropriate protective film, etc., the damage can be reduced to a non-problematic level, and this method has become popular.

(Problems to be Solved by the Invention) In recent years, in order to increase the recording density, the flying height of magnetic heads has become smaller and smaller, and some models have appeared that are less than 0.2 microns. For this reason, magnetic disks are required to have even better surface precision. However, if the surface precision is too good, the magnetic head will stick to the magnetic disk surface when the magnetic disk stops rotating, and the magnetic disk and magnetic head will be damaged when the rotation starts.

To solve this problem, a system has been proposed in which the magnetic head is kept away from the disk surface when the magnetic disk stops rotating, and the magnetic head is loaded onto the magnetic disk after the magnetic disk reaches steady rotation. However, since this is a two-step operation in which the magnetic head is loaded after the magnetic disk has completely started rotating, it has the disadvantage that it takes extra time to record and reproduce. In addition, since the magnetic head is loaded onto the surface of the magnetic disk that is rotating at a relatively high speed in steady rotation, the magnetic head is subject to the dynamic pressure effect, and unstable vibrations that occur in the pitching direction of the magnetic disk Interacts with the rotational speed of the magnetic disk, causing a resonance phenomenon that causes significant damage to the magnetic disk surface.

On the other hand, there is a method in which the magnetic head is loaded onto the magnetic disk while the rotation of the magnetic disk is stopped, and then the magnetic disk is rotated, but this method still requires time due to the two-stage operation, and the magnetic head is not loaded. There is also a risk of adsorption occurring.

This invention solves these conventional drawbacks.
To provide a loading method in a high-density, low-flying-height magnetic disk device that prevents a magnetic head from adhering to a magnetic disk surface without requiring extra time from starting rotation of the magnetic disk to recording and reproducing.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a transducer that records and reproduces information while floating on a recording disk due to a fluid bearing effect. When the rotation of the recording disk is stopped, the front recording disk is separated from the recording disk, and after the rotation of the recording disk is started, the front recording disk is moved away from the recording disk before the recording disk is in a rotating state where it is subjected to a dynamic pressure effect. The transducer loading method involves releasing the separation of the recording disk before loading.

It became law.

(Operation) While the magnetic disk, which is a recording disk, is not rotating, the magnetic head, which is a transducer, is supported at a position away from the surface of the magnetic disk. In this state, the magnetic disk begins to rotate, and before the magnetic head reaches a rotational state in which it can float slightly above the magnetic disk, the magnetic head is released from support and loading is performed. As a result, the magnetic head is released and slides on the surface of the rotating magnetic disk. When the rotation of the magnetic disk increases and reaches steady rotation, the magnetic head floats a small amount from the surface of the magnetic disk due to the hydrodynamic bearing effect (dynamic pressure effect), making it possible to perform recording and reproduction. In this way, when the magnetic head is loaded, it slides in contact with the surface of the magnetic disk rotating at a low speed, so that adsorption to the surface of the magnetic disk is prevented. Furthermore, since the magnetic disk rotates at a low speed, it does not resonate with vibrations in the pitching direction of the magnetic head, and damage to the magnetic disk surface is also prevented.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5.

1 to 3 show a multi-stage magnetic disk drive, and FIG. 4 shows a single unit form. The suspensions 7 and 9 having the magnetic head 3 are supported by a carriage arm 11, and the carriage arm 11 is arranged along the axial direction of the carriage boss 21 at the same interval as the magnetic disk 1. magnetic head 3
are arranged opposite to each other on both the upper and lower sides of the magnetic disk 1.

The carriage boss 21 is rotatably provided around a fixed shaft 17 by a bearing, and is rotated together with the carriage arm 11 by a driving motor 13. On a disk shaft 27 that can be supported parallel to the fixed shaft l7, magnetic disks 1 are arranged in multiple stages at regular intervals in the axial direction, and are provided corresponding to each carriage arm 11. Each gear ridge arm 11 is rotated integrally by a drive motor 13, and the magnetic head 3 at the tip thereof is moved and positioned relative to the magnetic disk 1 to record and reproduce information.

The magnetic head 3 is urged toward the upper and lower opposing surfaces of the magnetic disk 1 during recording and reproduction by suspensions 7 and 9. Further, when the magnetic disk 1 rotates, the magnetic head 3 is configured to levitate a small amount and separate from the surface of the magnetic disk 1 due to the hydrodynamic bearing effect.

Next, the head support means 5 for supporting the magnetic head 3 away from the magnetic disk 1 and releasing it will be explained. A load arm 31 that rotates around a load shaft 29 parallel to the fixed shaft 17 is provided on the outer peripheral side of the magnetic disk 1 where the magnetic head 3 is located. The tip of the load arm 31 has tapered surfaces 33 and 35 that can lift the suspensions 7 and 9, and each load arm 31 is rotated toward the suspensions 7 and 9 using a stepping motor or the like. By lifting the magnetic head 9 with the tapered surfaces 33 and 35, the magnetic head 3 is attached to the magnetic disk 1.
The structure is such that it is separated from the surface (Fig. 3). Furthermore, by rotating the load arm 31 outward around the load shaft 29 and releasing it from the suspensions 7 and 9, the magnetic head 3 can be loaded onto one surface of the magnetic disk (FIG. 2). . Reference numeral 37 denotes a bracket for pivotally supporting the two load shafts, and is attached to the housing.

In the head support means 5, when the rotation of the magnetic disk 1 is stopped, the load arm 31 lifts the suspensions 7 and 9 to support the magnetic head 3 away from the surface of the magnetic disk 1, as shown in FIG. operate to achieve the state. At this time, the magnetic head 3 is at position A in FIG. 5, where it is separated from the surface of the magnetic disk.

Next, the magnetic disk 1 starts to rotate, and before it reaches steady rotation, that is, before the magnetic head 3 reaches a rotating state in which it can fly a small amount over the surface of the magnetic disk 1, the suspension on the load arm 31 is activated. Support for defections on 7 and 9 will be lifted.

As a result, the magnetic head 3 comes into contact with the surface of the magnetic disk, and the magnetic head 3 slides on the surface of the rotating magnetic disk. At this time, the magnetic head 3 falls onto the surface of the magnetic disk that is rotating at a low speed, but since it is rotating at a low speed, no attraction phenomenon occurs, and the rotational speed of the magnetic disk 1 is also not that high. Since the speed is not high, unstable vibrations of the magnetic head 3 in the pitching direction cause resonance and do not damage the magnetic disk 1 or the surface of the magnetic head 3.

Note that a magnetic disk normally requires about 20 seconds from the time it starts rotating until it reaches steady rotation.

During this time, the magnetic head slides on the magnetic disk surface and does not fly for about 1/3 of the time, 6 to 7 seconds. Therefore, in this embodiment, the magnetic head 3 may be brought into contact with the surface of the magnetic disk 1 within 6 to 7 seconds after the rotation of the magnetic disk 1 is started.

Thereafter, until the magnetic disk 1 reaches steady rotation, the magnetic head 3 gradually levitates due to the fluid bearing effect.
When the rotation becomes steady, the magnetic head 3 reaches position B where recording and reproduction can be performed.

Next, when the rotation of the magnetic disk 1 is stopped, the load arm 31 is moved from the outside to the magnetic disk 1 while the magnetic head 3 is floating above the surface of the magnetic disk 1 at position B.
The suspensions 7 and 9 are lifted up by the tapered surfaces 33 and 35, and the magnetic head 3 is supported at position A, which is separated from the surface of the magnetic disk 1 (FIG. 3). Therefore, even if the rotation of the magnetic disk 1 stops and the floating force of the magnetic head 3 due to the hydrodynamic bearing effect disappears, the magnetic head 1 is supported by the load arm 31 and the distance A from the surface of the magnetic disk 1 is maintained.

In this way, since the magnetic head 3 is separated from the magnetic disk 1 when the magnetic disk 1 stops rotating, the magnetic head 3 does not stick to the magnetic disk 1, and the rotation can be started without any problem. be exposed. Furthermore, when the rotation of the magnetic disk 1 is stopped, the load arm 31 supports the suspensions 7 and 9 while the magnetic head 3 is floating, so there is no contact between the magnetic head 3 and the magnetic disk 1, and this contact state This occurs only when the rotation starts, and the amount of sliding of the magnetic head 3 is reduced, making it possible to further improve the reliability of the device.

Further, since the magnetic head 3 can quickly load onto the surface of the magnetic disk 1 after rotation of the magnetic disk 1, the time required for recording and reproduction is shortened.

Note that if the magnetic head 3 is moved away from the magnetic disk 1 by operating the head support means 5 using the back electromotive force generated when the drive motor 13 that rotates the magnetic disk 1 decelerates, it is possible to move the magnetic head 3 away from the magnetic disk 1 in an emergency such as a power outage. It is possible to create a mechanism that operates even when the magnetic head 3 is operated even when the magnetic head 3 is in a power outage state, thereby preventing damage to the magnetic head 3 in the event of a power outage, etc., and reducing power consumption.

Since the voltage of the back electromotive force is proportional to the motor rotational speed, the back electromotive force can be effectively utilized by providing a mechanism in which the head support means 5 is operated while the magnetic head is flying at a high rotational speed as in this embodiment.

[Effects of the Invention] As explained above, according to the present invention, the magnetic head is supported in a state separated from the surface of the recording disk while the recording disk is stopped rotating, and after the rotation starts, the magnetic head is moved away from the recording disk. Since the separating support is released before the magnetic head enters a rotational state in which a small amount of air can float on the surface, it is possible to prevent the magnetic head from adhering to the recording disk when the recording disk starts to rotate. The time required for recording and reproduction can be shortened.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic disk device showing one embodiment of the present invention, FIGS. 2 and 3 are enlarged side views showing the functions of main parts, and FIG. 4 is a partial perspective view of another embodiment. FIG. 5 is an operational diagram of a magnetic head with respect to a magnetic disk, FIG. 6 is a sectional view of a conventional magnetic disk device, and FIG. 7 is a perspective view of the conventional magnetic disk device. 1... Magnetic disk (recording disk) 3... Magnetic head 5... Head support means

Claims (1)

[Scope of Claims] A transducer that records and reproduces information while floating above the surface of a recording disk due to a fluid bearing effect, and when the recording disk stops rotating, the transducer is separated from the recording disk, and the recording A method for loading a transducer, characterized in that after the rotation of the disk is started, the separation of the transducer is released and loading is performed before the transducer reaches a rotational state where it is subjected to a hydrodynamic bearing effect.