JPS61198480A - Head-attraction releasing system - Google Patents

Abstract

PURPOSE:To secure a sufficiently long length of attraction-releasing moving extent by releasing the head from attraction by moving a carriage to a crush- stop position after unlocking the lock of an autolock lever at the time of start. CONSTITUTION:The position of the autolock lever 16 is moved from a conventional crush-stop position 12 for a length of L necessary for the attraction- releasing, and is set. In order not to move a carriage 13 during transportation, it is automatically locked by the autolock lever 16. The locking is automatically released when the power supply is turned on, and likewise locked when the supply is turned off. During stopping time of the system, the autolock lever 16 is made apart from a crush-stop 12 for a distance of L. When the power supply is turned on for driving, a pin 14 is disengaged from the lever 16, and a VCM 9 is driven so that a carriage 13 contacts the crush-stop 12. Moving the carriage 13 can be executed with a small force, and its length can be made sufficiently long by optionally setting the position of the autolock lever 16. As a result, the reliable releasing of attraction can be attained with a small force.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a method of
The present invention relates to a head attraction release method for a magnetic disk device that drives a head.

For example, as shown in FIG. 3, a magnetic disk device includes a plurality of disks 3 rotated by a spindle 2 having a motor 1, a carriage 4 for driving a head, and the carriage 4.
The head 7 is composed of an arm 5 attached to the arm 5, a pressure spring 6 fixed to the arm 5, and a head 7 attached to the pressure spring 6 via a gimbal (not shown). Note that 8 is the device base and 9 is the VCM.

When stopped, the head 7 is in contact with the disk 3 and is stopped. The disk surface is coated with lubricant to resist wear.

FIG. 4 shows the head slider 10, and the head slider surface has two rails 11. Since this rail 11 surface is very clean, lubricant collects on the rail 11 surface when stopped, and the head slider IO and disk 3 stick together.

If the head 7 is started in the sticky state, the gimbal will deform because the head 7 is held by the gimbal, and the head will no longer fly. Therefore, in order to prevent the gimbal from deforming, there is a need for a system that releases the adsorption of the head and starts it up.

[Conventional technology]

FIG. 5 is a plan view illustrating the attraction release method of a conventional magnetic disk device.

In FIG. 5, the head 7 is attached to a carriage 4 via a gimbal (not shown), a pressure spring 6, and an arm 5, and as the carriage 4 moves, the head 7 seeks and reads/writes.

In order to restrict the movement range of the carriage 4, and to restrict the movement range of the carriage 4,
In order to stop the head when the head goes out of control due to a failure in the circuit, a crash stop 12 (with a tip made of rubber) is provided across the carriage 4.

When stopped, the carriage 4 is in contact with the crash stop 12, and the head 7 is in contact with the disk 3. In order to release the adsorption of the head at startup, apply current to the VCM 9 and move the carriage 4 slightly in the direction of the stumper, bending the rubber of the crash stop 12 (width C or more of the rail 11 of the head slider 10 shown in Fig. 4). At this time, the head is released from adsorption due to the distortion of the crash stop 12.

Next, a current is applied in the opposite direction to VCM9, and the disk 3
Move the head 7 to the home position (cylinder 0.1) and enter the read/write state.

[Problem that the invention seeks to solve]

At startup, the head is released from adsorption by applying current to the VCM 9, moving the carriage 4 slightly in the direction of the crash stop 12, and bending the rubber of the crash stop 12. At this time, the rubber bends with a weak force. It is necessary.

The crash stop 12 is originally intended to stop the head from running out of control, and is therefore subjected to a strong force, so it requires a fairly high spring constant.

Therefore, in order to sufficiently bend the material when the adsorption is released, it is necessary to divide the stress strain characteristics into two stages: soft and hard. As a result, the structure becomes complicated, and furthermore, there are problems such as the rubber hardness changes due to temperature changes, and the stopping position of the carriage 4 changes, resulting in a lack of reliability.

[Means for solving problems]

The above problem is solved by providing the carriage with an auto-lock lever that fixes it in the stopped position, and by shifting the head holding position by the auto-lock lever from the position of the crash stop that restricts the range of movement of the carriage. This problem is solved by the head suction release method of the present invention, which moves the carriage to the crash stop position to release the head suction after unlocking the auto-lock lever.

[Effect]

The carriage is provided with an auto-lock lever that locks the carriage in a stopped position, and the auto-lock lever changes the carriage's fixing position from the crash stop position that restricts the range of movement of the carriage to the position required to release the head from suction. By shifting the distance by the same distance, and when starting the disc, the auto-lock lever is first unlocked, and then the adsorption is released by the distance. This eliminates the need for the conventional crash stop to have a complicated two-stage structure. , the adsorption release movement amount can be made sufficiently large.

〔Example〕

Hereinafter, the gist of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a plan view illustrating one embodiment of the present invention, and FIG.
The figure is a perspective view illustrating the auto-lock lever of the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 1, reference numeral 13 denotes a carriage, which has a pin 14 as shown in FIG. 2 on the underside of the conventional carriage 4 shown in FIG. Match.

The position of the auto-lock lever 16 is set to be offset from the conventional crash stop lever 12 position shown in FIG. 5 by a distance necessary for releasing the suction. In the example, the distance L (see Fig. 4) is set to the width of the head slider 10 of 3.2 mm.
Shifted by half 1.2 volts. Note that the other parts are exactly the same as the conventional structure shown in FIG.

The carriage 13 is automatically locked by an auto-lock lever 16 so that it does not move during transportation. This autorotator is automatically released when the power is turned on, and automatically locked when the power is turned off.

In the stopped state, Autorottuta crash stop 12
The farther away you are. When the power is turned on during driving, the auto-lock lever 16 and the pin 14 are disengaged, and the V
The CM9 is driven and the carriage 13 hits the crash stop 12. Since this movement of the carriage 13 moves a free carriage, only a weak force is required. Further, the moving distance of the carriage 13 can be made sufficiently large by arbitrarily setting the auto-lock lever 16 to an arbitrary setting position.

Note that the head 7 whose adsorption is released moves the carriage 13 to the home position (cylinder O of the disk).

Crash stop 1 that restricts the movement range of the carriage
2 requires only a high spring constant, which is originally required, and there is no need to have a structure in which the rubber hardness is divided into two levels as in the past, which simplifies the structure.

In addition, when the carriage 13 is stopped, the auto lock lever 1
6, there is no fluctuation in the stopping position as would occur with rubber.

〔Effect of the invention〕

As described above, according to the present invention, by shifting the head holding position by the auto-lock lever and the position of the crash stop, a large amount of suction release movement can be achieved, and reliable suction release can be performed with a small force.

[Brief explanation of drawings]

FIG. 1 is a plan view illustrating an embodiment of the present invention, FIG. 2 is a perspective view illustrating an auto-lock lever of the present invention, FIG. 3 is a diagram illustrating a magnetic disk device, and FIG. 4 is a diagram illustrating a magnetic disk device. 5 is a diagram illustrating the slider 10 of the magnetic head, and FIG.
be. In the figure, 3 is a disk, 5 is an arm, 6 is a pressure spring, 7 is a head, 12 is a crash stop, 13 is a carriage, 14 is a bottle, 15 is a solenoid, and 16 is an auto-lock lever. Grass I

Claims (1)

[Claims] In a magnetic disk drive having a spindle for holding a disk and a carriage mounted on a base and moved by a drive source, the carriage is provided with an auto-lock lever for fixing the carriage at a stop position, and the head is held by the auto-lock lever. The position is shifted from the position of a crash stop that regulates the movement range of the carriage, and after unlocking the auto-lock lever at startup, the head is released from adsorption by moving the carriage to the crash stop position. The head adsorption release method is characterized by: