JPH0362373A - Carriage lock mechanism for magnetic disk device - Google Patents

Abstract

PURPOSE:To realize a simple and inexpensive carriage lock mechanism without much power consumption by bringing a permanent magnet provided to a head arm into contact with an electromagnet when a magnetic head stays in a stop zone of a recording medium and locking the permanent magnet. CONSTITUTION:A magnetic head 24 at non-drive stays on a CSS zone 25b of a disk 25 and a permanent magnet 26 fitted to a head arm 21 is in contact with an electromagnet 27. In this case, a switch 30 is turned off, the permanent magnet 26 is attracted by the electromagnet 27 to fix the movement of the head arm 21, then the stop state of the magnetic head 24 is locked. The switch 30 is turned on at driving, then the electromagnet 27 is excited to cause a magnetic force repulsive to the magnetic force of the permanent magnet 26. Thus, the permanent magnet 26 is released from the electromagnet 27 and the lock state is released.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a carriage lock mechanism of a magnetic disk drive for locking the stopped state of movement of a magnetic head.

(Conventional technology) The configuration of a conventional carriage mechanism is shown in FIG.

In FIG. 3, the head arm 11 is rotatably mounted around a shaft 12 as a fulcrum. This head arm 11 is rotated by the drive of a voice coil motor (VCM) 13, and moves a magnetic head 14 attached to its tip in the radial direction (in the direction of arrow A) of a disk (recording medium) 15.

In a magnetic disk drive that uses the contact start/stop (C35) method, when the magnetic head 14 starts or stops, the disk 15 is A CSS zone 15b is provided on the innermost periphery of the 15, separate from the data zone 15a. In the C8S method, when the power is turned off (when the disk is stopped), the magnetic head (1
is stopped (in contact) with the disk 15 in this CSS zone 15b, and when the power is turned on and the rotation of the disk t5 is increased, it floats up and moves toward the outer circumference of the disk 15, that is, to the data zone L5a.

In addition, when the power is off, the magnetic head 14 may move from the C3S zone L5b due to some force (vibration) and damage the data zone 15a, so the stopped state of movement of the magnetic head 14 is locked. A locking mechanism is required to do so.

Conventionally, a solenoid 16, a spring 17 and a pawl 18
A locking mechanism consisting of
The stop state of the movement is locked by engaging with the retaining portion 19 of. This locking mechanism is
Cleared via 0. Switch 20 energizes solenoid 16 when turned on. When the solenoid 16 is energized, the claw 18 is pulled in the direction of arrow B against the urging force of the spring 17, and the head arm 11 is released.

Incidentally, with the recent spread of magnetic disk devices, there is a demand for their compactness and cost reduction. Under these current circumstances, providing a locking mechanism that requires a large number of parts as shown in Figure 3 not only hinders compactness, but also increases processing costs when installing it.
There are also problems that hinder cost reduction.

In addition, in a compact magnetic disk device, there is extremely little free space, and when the device is driven, the head arm 11
In order to prevent collision between the
It is necessary to release the condition in which the icon is displayed. However, in the configuration shown in FIG. 3, in order to release the locking mechanism, the switch 20 must be turned on and the solenoid 20 must be energized. This results in high power consumption, which is a problem especially when the magnetic disk device is incorporated into a battery-type personal computer or word processor.

(Problems to be Solved by the Invention) As described above, the conventional locking mechanism is complicated and requires a large number of parts, which poses problems that hinder miniaturization and cost reduction.

Furthermore, in order to release the locked state, it is necessary to constantly supply current, which poses a problem of high power consumption.

The present invention has been made in view of the above points, and an object of the present invention is to provide a carriage lock mechanism for a magnetic disk device that has a simple and inexpensive configuration and consumes no power.

[Structure of the Invention] (Means for Solving the Problems) That is, the carriage lock mechanism of a magnetic disk device according to the present invention includes a permanent magnet provided in a head arm that moves a magnetic head, and a permanent magnet that moves the magnetic head in a stop zone of a recording medium. , the permanent magnet is brought into contact with an electromagnet, and when the magnetic head is moved from the stop zone of the recording medium to the data zone, the magnetic force is generated in a direction repulsive to the electromagnetic force of the permanent magnet. It is designed to excite an electromagnet.

(Function) According to the above configuration, the stopped state of movement of the magnetic head is locked by bringing the permanent magnet provided on the head arm into contact with the electromagnet. Further, at this time, by exciting the electromagnet, the permanent magnet is separated from the electromagnet, and the locked state is released.

In this way, by using magnets, a simple and inexpensive locking mechanism can be constructed because a large number of parts are not required. Furthermore, since power is required only when releasing the locked state, power consumption is also low.

(Embodiment) Hereinafter, a carriage lock mechanism of a magnetic disk device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a carriage lock mechanism of a disk device using the C8S method. The head arm 21 is rotatably mounted on a support 22 as a fulcrum, and is rotated by the drive of a voice coil motor (VCM) 23.

A magnetic head 24 is attached to the tip of the head arm 22. The magnetic head 24 moves in the radial direction (
(in the direction of arrow A) to record/reproduce data on the disk 25. This disk 25 has a data zone 25.
a and a CSS zone 25b. data zone 2
5a is an area where data is recorded. In the C8S system, the magnetic head 24 when not driven is stopped in this C5S zone 25b.

The head arm 21 is provided with a permanent magnet 26 as a mechanism for locking the movement of the magnetic head 24 in a stopped state. This permanent magnet 26 contacts the electromagnet 27 when the magnetic head 24 is in the C8S zone 25b of the disk 25. The electromagnet 27 has a metal part 28
and a solenoid 29 wound around this metal part 28. , solenoid 29 is energized via switch 30.

FIG. 2 is a block diagram showing the configuration of the control system of the same embodiment. The CPU 31 controls the entire magnetic disk device, and has the function of controlling the switch 30 on/off in this embodiment. The ROM 32 stores data such as programs for starting the CPU 31. A read/write circuit (R/W circuit) 33 reproduces/records data through the magnetic head 24. The VCM drive circuit 34 supplies current to the voice coil motor 23 to drive the voice coil motor 23. The spindle motor drive circuit 35 supplies current to the spindle motor 37 to drive the spindle motor 37. This spindle motor 37 is
This is a motor for rotating the disk 25.

Further, the relay drive circuit 36 drives the switch 30 under the control of the CPU 31.

Next, the operation of this embodiment will be explained.

When not driven, the magnetic head 24
Located in 8S zone 25b. When the magnetic head 24 is in the C8S zone 25b, the permanent magnet 26 attached to the head arm 21 is in contact with the electromagnet 27. At this time, the switch 3o is off.

Therefore, the permanent magnet 26 attracts the electromagnet 27 and fixes the movement of the head arm 21. As a result, C8S
The stopped state of movement of the magnetic head 24 in the zone 25b is locked.

On the other hand, when driving, the magnetic head 24 is connected to the disk 25.
When moving from the CSS zone 25b to the data zone 25a, the CPU 31 turns on the switch 30 through the relay drive circuit 36, and excites the electromagnet 27 to generate a magnetic force in a direction repelling the magnetic force of the permanent magnet 26.

That is, for example, if the N pole of the permanent magnet 2B comes into contact with the electromagnet 27, a current is passed through the solenoid 29 in a direction such that the N pole is generated on the permanent magnet 26 side of the electromagnet 27.

When the electromagnet 27 is excited in this way, due to the magnetic force of the electromagnet 27 at this time, the permanent magnet 26 is
Pushed away from 7. As a result, the locked state between the permanent magnet 26 and the electromagnet 27 is released. After this locked state is released, the switch 30 is turned off so that no current flows through the solenoid 29. In this case, it is assumed that the permanent magnet 26 does not interfere with the electromagnet 27 within the range in which the magnetic head 24 moves in the data zone 25a. That is, when the magnetic head 24 is in the data zone 25a, there is no attraction between the permanent magnet 2G and the electromagnet 27 that would affect its seek operation.

In this way, by using magnets, the number of parts can be reduced, making it possible to construct a simple and inexpensive locking mechanism.
The magnetic disk device can be made more compact and lower in cost. Furthermore, since power is required only when releasing the locked state, power consumption is also low. Therefore, it is advantageous when a magnetic disk drive is incorporated into a battery-type personal computer or word processor.

In addition, when releasing the locked state, the electromagnet 27
It is conceivable to use the force of the voice coil motor 23 to separate the permanent magnet 26 and the electromagnet 27 without energizing the permanent magnet 26 and the electromagnet 27. However, in this case, when releasing the locked state, the driving force of the voice coil motor 23 must be increased, which requires more electric power than when exciting the electromagnet 27, and also makes seek control difficult. There's a problem.

[Effects of the Invention] As described above, according to the present invention, since magnets are used, a simple and inexpensive locking mechanism can be constructed without requiring a large number of parts. Furthermore, since power is required only when releasing the locked state, power consumption is also low.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a carriage lock mechanism according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a control system of the same embodiment, and FIG. 3 is a diagram showing the configuration of a conventional carriage lock mechanism. FIG. 21...Head arm, 22...Axis, 23...Voice coil motor, 24...Magnetic head, 25...
Disk, 25a...Data zone, 25b...C
8S zone, 26... permanent magnet, 27... electromagnet,
28...Metal part, 29...Solenoid, 30...
switch. Diagram

Claims (1)

[Claims] A recording medium having a stop zone and a data zone; a magnetic head that seeks on this recording medium and records/reproduces data; and a magnetic head with the magnetic head attached to the tip thereof. a head arm for moving the recording medium in the radial direction; a permanent magnet attached to the head arm; and an electromagnet provided to contact the permanent magnet when the magnetic head is in the stop zone; A magnetic disk comprising excitation means for exciting the electromagnet so as to generate a magnetic force in a direction repelling the magnetic force of the permanent magnet when the magnetic head is moved from the stop zone to the data zone. Carriage locking mechanism of the device.