JPH03214476A - Locking mechanism for actuator - Google Patents

Abstract

PURPOSE:To prevent metal powder occurring by moving the movable part of an actuator to a stopping area when a magnetic disk device is stopped, and locking the movable part with non-contact by a magnetic attractive force between the magnetic field of a permanent magnet. CONSTITUTION:A magnetic locking part 8 is provided at a yoke part 9 on which a coil 6 is mounted, and a magnetic head 3 is mounted at the movable part 4 via a head arm 10, and the movable part 4 fixes the field 5 of the permanent magnet outside an almost semi-circular range. When the head 3 is moved to the stopping area of a magnetic disk 1, the tip of the locking part 8 approaches the terminal part of the field 5. Since the magnetic attractive force is proportional to the square of distance, an attractive force can be increased by reducing the distance between the locking part 8 and the field 5 even when the former is not brought into contact with the latter. Thereby, the head 3 can be locked at the stopping area of the disk 1. Since lock is performed with non-contact, no metal powder, etc., occurs, and the inside of the magnetic disk device is prevented from being contaminated.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a locking mechanism for an actuator when the operation of a magnetic disk drive is stopped, and the purpose is to lock the actuator in a simple and non-contact manner, and the magnetic disk is rotated by a spindle motor. and,
In a magnetic disk drive including a magnetic head positioned on a command cylinder on the magnetic disk by a movable part of an actuator, and a motor part of the actuator consisting of a permanent magnet field and a coil, the operation of the magnetic disk drive includes: A magnetic lock part is provided that moves the movable part of the actuator to a stop area when stopped, and locks the movable part in a non-contact manner by a magnetic attraction force between the actuator and the permanent magnet field.

[Industrial application field]

The present invention relates to an actuator locking mechanism when the operation of a magnetic disk device is stopped.

In recent years, information processing systems have been widely used in various fields, and it has become necessary to store large amounts of disks. For this purpose, the importance of magnetic disk devices as storage devices is increasing, and it is desired to prevent scratches and unnecessary pressure from being applied to the magnetic disk surface of the storage medium. ing.

Also, start up the magnetic disk device. A contact start strike method is adopted in which the magnetic head directly contacts the magnetic disk when stopped, and the magnetic head aerodynamically levitates a small distance relative to the Louis 1 disk during operation.

In this type of magnetic disk drive, when the operation is stopped, the magnetic head is in contact with the magnetic disk and is stationary, so even if external vibrations are applied, the magnetic head can transfer data from the stopped area on the magnetic disk. It must be locked to prevent it from being moved to the storage area.

[Conventional technology]

The magnetic disk and magnetic head of the magnetic disk device have, for example, the configuration shown in the top view of main parts in FIG. 4, where 21 is a magnetic disk, 22 is an actuator section,
3 is a magnetic head, 24 is a carriage, 25 is a permanent magnet field, 26 is a coil, 27 is a motor section, 29 is a yoke, 3
0 is a head arm, 3l is a stop area, 32 is a data area, 33 is a spindle, 34 is a stopper, and 35 is a case.

A permanent magnet field 25 magnetized in the N and S directions in the radial direction is fixed within a substantially semicircular range of the outer circumference of the carriage body 24 of the actuator section 22, and a substantially semicircular yoke is placed on the outside with a gap. A coil 26 is fixed inside the magnetic head 29 to constitute a rotating permanent magnet field type motor section 27, a magnetic head 23 is provided on the carriage 24 via a head arm 30, and the motor 27 is driven by a drive signal. As a result, the magnetic head 23 is positioned on a designated track in the data area 32 of the magnetic disk 21, and data is written or read.

The stopper 34 is made of hard rubber or the like, and the movement range of the magnetic head 23 is defined by the projection of the carriage 24 coming into contact with the stopper 34. Also, when the magnetic disk device stops operating, the magnetic disk 21
The magnetic head 23 is moved to the stop area 31 of .

FIG. 5 is a schematic sectional view of the magnetic disk device, and the same reference numerals as in FIG. 4 indicate corresponding parts, 36 is a fixed shaft of the actuator section 22, 37 is a fixed shaft, 38 is a stator of the spindle motor, 39 The rotor 40 is a base, 4l is a spindle cover, and 42 is an actuator cover.

Fixing the fixed shafts 36 and 37 to the base 40, assembling the spindle part and the actuator part 22, and attaching the spindle part cover 41 and the actuator part cover 42,
The structure is configured to prevent dust from entering the inside of the magnetic disk device.

Also, although the case is shown in which three magnetic disks 2l are fixed, a larger number of magnetic disks can be attached depending on the storage capacity. The stator 38 and the rotor 39 constitute a spindle built-in motor, but a configuration in which a spindle motor rotates a shaft to which the magnetic disk 21 is fixed is also known.

FIG. 6 is a top view of the main parts of the conventional example, in which a solenoid part 51, a lock part 52 and a carriage lock part are used to lock the magnetic head 23 to the stop area 3l of the magnetic disk 2l when the operation of the magnetic disk device is stopped. 53 are provided. The carriage long section 53 is fixed to the carriage 24, and the solenoid section 5l is fixed to the yoke 29 side.

When the magnetic disk drive is in operation, the solenoid section 5l is energized from a power source (not shown), the lock section 52 is retracted from the carriage lock section 53, and the permanent magnet field 2 is energized.
The magnetic head 23 is positioned on a designated track on the magnetic disk 2l by a motor section 27 comprising a magnetic head 5 and a coil 26.

Also, when the magnetic disk device stops operating, the solenoid section 51
Since the excitation of is cut off, the lock portion 52 returns to the illustrated position and engages with the carriage lock portion 53, thereby locking the magnetic head 23 so that it does not move from the stop area 3l of the magnetic disk 2l.

[Problems to be Solved by the Invention] As mentioned above, when the magnetic disk drive stops operating, the magnetic head 23 can be locked in the stop area 3l of the magnetic disk 2l, but when the magnetic disk drive is in operation, the solenoid Since it is necessary to continuously excite the section 5l, there is a drawback that power consumption increases.

In addition, since the lock portion 52 and the carriage lock portion 53 are mechanically engaged, the metals slide against each other, so that metal powder is generated due to wear and contaminates the inside of the magnetic disk device.

or! With the miniaturization of n-air disk devices, the solenoid section 5
It has become difficult to secure space to install the L.

An object of the present invention is to lock an actuator with a simple structure and without contact.

[Means to solve the problem]

The actuator locking mechanism of the present invention uses a permanent magnet field for locking, and will be described with reference to FIG. 1.

The magnetic disk l rotated by the spindle motor and the magnetic disk l rotated by the movable part 4 of the actuator 2.
In a magnetic disk drive equipped with a magnetic head 3 positioned on an upper command cylinder and a motor section 7 consisting of a permanent magnet field ifi 5 and a coil 6, when the magnetic disk drive stops operating, the movable part of the actuator 2 4 is moved to a stop area, and a magnetic locking section 8 is provided which locks the movable section 4 without contact by the magnetic attraction force between it and the permanent magnet field 5.

[Effect]

When the magnetic disk device stops operating, the magnetic head 3 is moved to the stop area of the magnetic disk l, and at that time, the space between the magnetic locking part 8 and the permanent magnet field 5 is made to be very small. By configuring this, the magnetic field between the permanent magnet 5 and the magnetic body locking part 8 becomes large, and the movable part 4 can be locked in a non-contact manner by the magnetic attraction force.

Moreover, since it is non-contact, when the operation of the magnetic disk drive starts, the drive power of the motor section 7 of the actuator 2 increases only slightly, and the lock can be easily released, and the operation of the magnetic disk drive starts. Inside, the distance between the permanent magnet field 5 and the coil 6 is the same as that between the permanent magnet field 5 and the magnetic lock part 8.
The influence of the magnetic lock portion 8 can be ignored because the distance is small compared to the distance between the magnetic lock portion 8 and the magnetic lock portion 8.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a top view of essential parts of an embodiment of the present invention, showing a case where a magnetic body lock portion 8 is provided on a yoke 9 to which a coil 6 is attached, and the magnetic head 3 is connected via a head arm lO. A permanent magnet field 5 is attached to the movable part (carriage) 4 and is fixed outside a substantially semicircular range of the movable part 4, which is magnetized in N and S directions in the radial direction. Also, almost semicircular yoke 9
A coil 6 is fixed inside, and the permanent magnet field 5 and the coil 6 constitute a rotating permanent magnet field type motor section 7. Note that the stopper 34 and the like that restrict the operating range in FIG. 4 are omitted from illustration.

The coil 6 is excited by a drive signal to position the magnetic head 3 on the command cylinder of the magnetic disk l, and the movement range of the magnetic head 3 during operation of the magnetic disk device is the data area 32 shown in FIG. Further, when the operation of the magnetic disk device is stopped, the magnetic head 3 is electrically or mechanically moved to the stop area 3l.

When the magnetic head 3 is moved to the stop area of the magnetic disk 1, the tip of the magnetic lock portion 8 and the end of the permanent magnet field 5 come close to each other. For example, the magnetic attraction force is proportional to the square of the distance, so even if the magnetic lock part 8 and the permanent magnet field 5 do not contact each other, the attraction force decreases as the distance between them becomes smaller. growing. Thereby,
The magnetic head 3 can be locked to the stop area of the magnetic disk l.

When operating the magnetic disk device, the driving power is only slightly increased compared to the conventional example in which the magnetic lock part 8 is not provided, and the permanent magnet field 5 moves away from the magnetic lock part 8 during operation. Therefore, the influence of the magnetic lock portion 8 can be ignored. That is, the actuator 2 is driven in the same way as in the conventional example.

FIG. 2 is a top view of main parts of another embodiment of the present invention;
The same reference numerals as in the figure indicate the same parts. In this embodiment, an adjustable magnetic locking portion 8a is provided on the yoke 9, and by pulling the tip of the magnetic locking portion 8a toward the yoke 9, the permanent magnet field 5 and the magnetic locking portion can be connected to each other. The suction force between the part 8a and the part 8a becomes small, and no locking action occurs.

Therefore, by adjusting the protruding length of the magnetic locking portion 8a when assembling the magnetic disk device, it is also possible to realize a configuration that does not require a locking action.

FIG. 3 is a block diagram of the main part of the embodiment of the present invention when the operation is stopped. The spindle motor l1 rotates the magnetic disk l, and the actuator 2 positions the magnetic head 3 at the command cylinder of the magnetic disk l. This drive signal for the actuator 2 is applied via the switch section 14, and when the operation of the magnetic disk device is stopped, the switch section 14 enters the switching state shown.

Further, the spindle motor 11 is supplied with power from a power source via the drive control unit l2, and rotates the magnetic disk l at a constant rotation speed such as 360 rpm. The switch is in the switching state shown.

Therefore, when the magnetic disk drive stops operating, the spindle motor 11 continues to rotate due to inertia, and an electromotive force is generated in its coil. This electromotive force is rectified by the rectifier of the drive control unit l2, and the current limiter 13 limits the flow of an extremely large current, and drives the actuator 2 via the switch section 14. As a result, the magnetic head 3 is moved to the stop area of the magnetic disk 1, and when the magnetic head 3 is moved to the stop area, the actuator is locked according to each of the embodiments described above.

In the above embodiment, when the rotating permanent magnet field type motor section 7 is used, the magnetic lock sections 8, 8a are provided on the yoke 9 on the stator side. 5 is fixed and the coil 6 is fixed to the movable part 5 to form a rotating coil type motor part. In this case, the movable portion 5 is provided with magnetic lock portions 8, 8a. In addition, the stop zone of the magnetic disk l is not limited to the inner side.
Although it may be formed on the outside, the present invention is applicable to either case. Further, since the magnetic head 3 is moved to the stop area of the magnetic disk l when the operation of the magnetic disk device is stopped, the embodiment shown in FIG. 3 has the advantage that no extra power is consumed. It is also possible to move the magnetic head 3 to the stopping area of the magnetic disk 1 by using a mechanical return force such as a spring.

〔Effect of the invention〕

As explained above, the present invention has a motor section 7 consisting of a permanent magnet field 5 and a coil 6, and moves the magnetic head 3 to the stop area of the magnetic disk l when the operation of the magnetic disk device is stopped. Sometimes, magnetic locking parts 8, 8a are provided for locking with the magnetic attraction force between the permanent magnet field 5, and the locking is performed without contact.
Metal powder, etc. will not be generated. Therefore, there is an advantage that the inside of the magnetic disk device is not contaminated.

Also, since it does not use a solenoid part, it has the advantage of not consuming excess power. Also, magnetic lock part 8.8a
Since only the following is provided, there is an advantage that there is a large degree of freedom in design when downsizing the magnetic disk device.

[Brief explanation of drawings]

1 and 2 are top views of main parts of different embodiments of the present invention, FIG. 3 is a block diagram of main parts of the embodiment of the present invention when the operation is stopped, and FIG. 4 is a main part of a magnetic disk device. top view,
FIG. 5 is a schematic cross-sectional view of a magnetic disk device, and FIG. 6 is a top view of essential parts of a conventional example. ■Hamoi 1 disk, 2 actuator, 3 magnetic head, 4 moving part, 5 permanent magnet field, 6 coil,
7 is a motor section, 8 and 8a are magnetic lock sections, 9 is a yoke, and IO is a head arm.

Claims (1)

[Claims] A magnetic disk (1
), a magnetic head (3) positioned on the command cylinder on the magnetic disk (1) by the movable part (4) of the actuator (2), a permanent magnet field (5), and a coil (6). In a magnetic disk drive including a motor section (7) of the actuator (2), when the operation of the magnetic disk drive is stopped, the movable section (4) of the actuator (2) is moved to a stop area; A locking mechanism for an actuator, characterized in that a magnetic locking part (8) is provided that locks the movable part (4) without contact by a magnetic attraction force between it and the permanent magnet field (5).