KR100532491B1 - Ramp loading type head parking apparatus for disk drive - Google Patents

Abstract

Disclosed is a ramp-loading head parking apparatus of a disc drive. The disclosed head parking device is for parking a read / write head mounted to an actuator when the disk stops rotating, an end-tab extending from the suspension end of the actuator and disposed adjacent to the outer edge of the disk. And a lamp having a support for supporting the end-tab when the rotation is stopped. And, each of the end-tab and the support of the lamp is provided with a magnet to generate a repulsive force with each other, the loading and unloading of the head is made in the state that the end-tab and the support does not contact. According to such a head parking device, since the end-tab and the lamp do not come into contact with the repulsive force between magnets having the same polarity when loading and unloading the head, particle generation and mechanical properties due to friction between the end-tab and the lamp are caused. Instability is eliminated.

Description

Ramp loading type head parking apparatus for disk drive}

The present invention relates to a disk drive, and more particularly, to a ramp-loading head parking device for safely parking a read / write head when the disk stops rotating.

A hard disk drive (HDD), which is one of information storage devices of a computer, is a device for reproducing data stored on a disk or using a read / write head. In such a hard disk drive, the head performs its function while being moved to a desired position by an actuator in a state in which the head rises a predetermined height from the recording surface of the rotating disk.

1 is a plan view schematically illustrating a structure of a conventional hard disk drive, and FIG. 2 is an enlarged perspective view of a suspension portion of a lamp and an actuator illustrated in FIG. 1.

1 and 2 together, the hard disk drive includes a spindle motor 12 installed on the base member 10, one or more disks 20 mounted on the spindle motor 12, and data of the data. An actuator 30 is provided for moving a read / write head (not shown) for reproduction and recording to a predetermined position on the disc 20.

The actuator 30 includes a swing arm 32 rotatably coupled to the pivot bearing 31 installed on the base member 10, and a slider mounted at one end of the swing arm 32 to mount the head ( It has a suspension 33 supporting elastically biased toward the surface of the disk 20. The slider 35 is generally supported by the suspension 33 in a state of being attached to the flexure 34.

The actuator 30 is provided with a voice coil motor (VCM) for rotating the swing arm 32. The voice coil motor has a VCM coil 37 coupled to the other end of the swing arm 32 and a magnet 38 disposed to face the VCM coil 37. The voice coil motor having such a configuration is controlled by a servo control system, and swing arm in a direction complying with Fleming's left hand law by the interaction of a current input to the VCM coil 37 and a magnetic field formed by the magnet 38. Will rotate (32). That is, when the power of the hard disk drive is turned on and the disk 20 starts to rotate in the direction of arrow D, the voice coil motor rotates the swing arm 32 in the counterclockwise direction (arrow A direction) to read / write. The slider 35 on which the write head is mounted is moved over the recording surface of the disc 20. The slider 35 rises a predetermined height from the surface of the disk 20 by the lifting force generated by the rotating disk 20, and the head mounted on the slider 35 in this state is A function of reproducing or recording data is performed on the recording surface.

On the other hand, when the hard disk drive is not operated, that is, when the rotation of the disk 20 is stopped, the head is parked at a position off the recording surface of the disk 20 so that the head does not hit the recording surface of the disk 20. . The head parking device provided for this purpose can be largely divided into a contact start stop (CSS) method and a ramp loading method. The CSS method is a method in which a parking zone in which no data is recorded is provided on the inner circumferential side of the disc, and the parking zone is contacted with the parking zone. However, according to the CSS-type head parking apparatus, a parking zone must be provided on the inner circumferential side of the disk, thereby reducing the data storage space. Therefore, in recent years, in response to the trend of increasingly high data recording density, a ramp-loading head parking device capable of securing a wider data storage space has been widely adopted.

The lamp loading method is to install a lamp 40 on the outside of the disk 20, and to park the head on the lamp 40. To this end, an end-tab 36 is provided at the end of the suspension 33 supported by the ramp 40. When the power of the hard disk drive is turned off and the rotation of the disk 20 stops, the voice coil motor rotates the swing arm 32 clockwise (arrow B direction), and thus the end-tap 36 ) Moves along the support surface 41 of the lamp 40 from the disk 20 and rests on the support surface 41.

In the state where the read / write head is parked on the lamp 40 as described above, the actuator 30 is arbitrarily rotated by an external shock or vibration applied to the disk drive so that the head leaves the lamp 40 and the disc 20 ) Can be moved to the recording surface. In such a case, the head may be in contact with the recording surface of the disk 20 and the head and the recording surface of the disk 20 may be damaged. Therefore, when the rotation of the disk 20 is stopped and the head is parked by the lamp 40, it is necessary to lock the actuator 30 at a predetermined position so as not to rotate arbitrarily. For this purpose, the actuator latch 60 is provided. .

However, in the conventional ramp-loading head parking apparatus as described above, when the end-tab 36 moves toward the disk 20 or moves over the support surface 41 of the lamp 40, the end-tab ( Sliding friction occurs between 36 and the support surface 41 of the lamp 40. When this friction is repeated, the support surface 41 of the lamp 40, which is generally made of plastic, is worn and particles are generated. 3 shows the particles attached to the end-tab 36. The particles generated as described above contaminate the surface of the disk 20, and thus, the particles and the head attached to the surface of the disk 20 collide with each other while the disk 20 rotates. ) Will be damaged. And, when the friction between the end-tab 36 and the support surface 41 of the lamp 40 is severe, the resistance to the movement of the end-tab 36 is increased, thereby loading and unloading the head. There is a problem that the loading operation becomes unstable. In addition, since the end-tab 36 is in strong contact with the lamp 40 during unloading of the head, the end-tab 36 is likely to be twisted or damaged.

In recent years, hard disk drives have been developed for ultra-light weight, high capacity, and miniaturization, and have greatly increased track per inch (TPI) for increasing storage capacity of disks, and head injuries have gradually decreased. Accordingly, the problems caused by the friction between the end-tab and the lamp are becoming more serious.

Disclosure of Invention The present invention was created to solve the above-mentioned problems of the prior art, and in particular, a disk capable of loading and unloading a head in a state in which an end-tab and a lamp are not contacted by using a repulsive force between magnets having the same polarity. It is an object of the present invention to provide a ramp-loading head parking device of a drive.

The present invention to achieve the above technical problem,

A head parking device of a disk drive for parking a read / write head mounted on an actuator when a disk is stopped rotating,

An end-tab extending from the suspension end of the actuator; And

A lamp disposed adjacent the outer edge of the disk and having a support for supporting the end-tab when the disk stops rotating;

Each of the end-tab and the support of the lamp is provided with a magnet for generating a repulsive force, so that the disk is loaded and unloaded without the end-tab and the support is in contact with each other Provides a head parking device.

Here, a first magnet may be installed on a surface of the end-tab facing the support part, and a second magnet may be installed on a surface of the end-tab facing the end-tab, wherein the first magnet and the second magnet may be installed. The magnets are arranged so that the same polarities face each other.

Meanwhile, a first magnet may be installed on a surface of the end-tab facing the support, and the support may be a second magnet, and the first magnet and the second magnet may be disposed to face the same polarity.

The first magnet and the second magnet may be made of a permanent magnet.

On the other hand, the first magnet and the second magnet may be made of a soft plastic magnet or a rubber magnet.

On the other hand, a coating film having a buffer property may be formed on the surfaces of the first magnet and the second magnet, respectively.

The end-tab is preferably bent in a direction away from the surface of the disk.

According to such a head parking device, since the end-tab and the lamp do not come into contact with the repulsive force between magnets having the same polarity when loading and unloading the head, particle generation and mechanical properties due to friction between the end-tab and the lamp are caused. Instability is eliminated.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the head parking device of the disk drive according to the present invention. Like reference numerals in the following drawings indicate like elements.

4 is a perspective view illustrating a lamp-loading head parking device of a disk drive according to a preferred embodiment of the present invention, and FIG. 5 is a side view of the head parking device shown in FIG. 4.

4 and 5 together, the head parking apparatus according to the present invention is employed in a disk drive for reproducing data stored in the disk 120 or recording data in the disk 120, the rotation of the disk 120 A device for parking a read / write head mounted on the actuator 130 at a certain place when stopped.

The actuator 130 is used to move a read / write head for recording and reproducing data to a predetermined position on the disc 120, and a swing arm 132 rotatably installed on a base member of the disc drive. The head has a slider 135 and a suspension 133 installed at an end of the swing arm 132 to support the slider 135 to be elastically biased toward the surface of the disk 120. The slider 135 is generally supported by the suspension 133 while attached to the flexure 134. In addition, a dimple 136 protruding toward the flexure 134 is formed in the suspension 133, and a predetermined elastic force is provided to the flexure 134 by the dimple 136.

The actuator 130 configured as described above is rotated clockwise or counterclockwise by a voice coil motor (not shown). The voice coil motor rotates the swing arm 132 counterclockwise when the disk drive is turned on and the disk 120 starts to rotate to move the head over the recording surface of the disk 120. When the disk drive is turned off and the rotation of the disk 120 stops, the swing arm 132 is rotated clockwise to park the head in the head parking apparatus according to the present invention.

The head parking device according to the present invention includes an end-tab 137 provided on the suspension 133 of the actuator 130 and a lamp 140 disposed adjacent to an outer edge of the disk 120. And magnets 138 and 142 provided on each of the end-tab 137 and the lamp 140 to generate a repulsive force from each other.

The end-tab 137 is formed to extend from the end of the suspension 133 of the actuator 130, and when the head parking, as described above, by the clockwise rotation of the swing arm 132 by the voice coil motor, 140) is moved up.

The lamp 140 has a support 141 for supporting the end-tab 137 moved above the lamp 140 when the disk 120 stops rotating. This lamp 140 is typically made of plastic injection molding.

The magnets 138 and 142 are features of the present invention and include a first magnet 138 installed in the end-tab 137 and a second magnet 142 provided in the support 141 of the lamp 140. Is done. Specifically, the first magnet 138 and the second magnet 142 may be made of a permanent magnet. In addition, the first magnet 138 is installed on a surface of the end-tab 137 facing the support part 141, and the second magnet 142 is the end-tab of the support part 141. 138 is provided on a surface opposite to the predetermined thickness. In particular, the first magnet 138 and the second magnet 142 are arranged such that the same polarities face each other. Thus, when the end-tab 137 moves over the support 141 of the lamp 140 during head parking, a repulsive force acts between the first magnet 138 and the second magnet 142, thus the end -The tab 138 and the support 141 of the lamp 140 are not in contact and a predetermined distance is maintained between them.

Meanwhile, although the second magnet 142 is illustrated and described as being installed on the surface of the support part 141 of the lamp 140 at a predetermined thickness, the second magnet 142 may have a different configuration. For example, the entire support part 141 may be made of a second magnet. In this case, the first magnet 138 installed on the end-tab 137 and the second magnet constituting the support part 141 have the same polarity. It is arranged to face.

However, if the first magnet 138 is installed in the end-tab 137 as described above, when the end-tab 137 is located on the recording surface of the disc 120, it is generated from the first magnet 138. There is a possibility that data written magnetically on the surface of the disc 120 may be damaged by the magnetic field. To prevent this, it is preferable to bend the end-tab 137 away from the surface of the disk 120 as shown. As a result, the distance between the first magnet 138 and the disk 120 increases, so that the strength of the magnetic field from the first magnet 138 affecting the surface of the disk 120 may be much weaker. For reference, the strength of the magnetic field is inversely proportional to the square of the distance.

Hereinafter, the operation of the head parking device according to the present invention having the above configuration will be described.

FIG. 6 is a diagram for describing a head parking process by the head parking apparatus shown in FIG. 4.

Referring to FIG. 6, when the operation of the disc drive is completed and the rotational speed of the disc 120 begins to decrease, the head-mounted slider 135 and the end-tab 137 are driven by the rotation of the swing arm 132. This moves to the edge portion of the disk 120. In the unloading of the head, a repulsive force is generated between the first magnet 138 attached to the bottom surface of the end-tab 137 and the second magnet 142 attached to the upper surface of the support part 141 of the lamp 140. As a result, the end-tab 137 is raised to a position spaced apart from the support 141 by a predetermined distance. In addition, the repulsive force continuously acts on the end-tab 137, and thus the end-tab 137 is parked on the support 141 while maintaining a predetermined distance from the support 141. In this case, the gap between the end-tab 137 and the support 141 can be adjusted by changing the strength of the first magnet 138 and the second magnet 142.

On the other hand, when the disk 120 starts to rotate to operate the disk drive, while the predetermined distance is maintained between the end-tab 137 and the support 141, the loading of the head is performed in the reverse process as described above. Will be done.

As described above, according to the head parking apparatus according to the present invention, the end-tab 137 and the support 141 by the repulsive force of the first magnet 138 and the second magnet 142 during the loading and unloading of the head. Predetermined spacing is maintained between them so that they do not touch each other. Accordingly, since particles are not generated due to friction between the support 141 and the end-tab 137 of the lamp 140, damage to the surface of the disc 120 and the head due to the particles is reduced. In addition, since friction does not occur between the end-tab 137 and the lamp 140, the loading and unloading operations of the head can be performed stably. In addition, since the end-tab 137 does not collide with the lamp 140 when the head is unloaded, the problem that the end-tab 137 is twisted or damaged due to such a collision is also solved.

On the other hand, even if a predetermined distance is maintained between the end-tab 137 and the support portion 141 of the lamp 140, when a strong impact is applied to the disk drive, the first magnet 138 installed in the end-tab 137. ) And the second magnets 142 installed on the support part 141 may collide with each other, and thus, the first and second magnets 138 and 142 may be damaged or particles may be generated.

Therefore, in order to prevent this in advance, as the first and second magnets 138 and 142, for example, a soft plastic magnet or a rubber magnet manufactured by mixing magnetic particles in a buffer material such as soft plastic or rubber. Can be used.

In addition, as another method for preventing the above problem, as shown in FIG. 7, the coating film 139 having buffering properties such as soft plastic or rubber on the surfaces of the first and second magnets 138 and 142, respectively. 143 may be formed.

As described above, when the first and second magnets 138 and 142 are made of a soft plastic magnet or a rubber magnet, or when the buffer coating layers 139 and 143 are formed on the surface thereof, a strong impact is applied to the disk drive. Even when the first and second magnets 138 and 142 collide with each other, the first and second magnets 138 and 142 are hardly damaged and little particles are generated.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

As described above, according to the head parking apparatus of the disk drive according to the present invention, the end-tab and the lamp are not contacted by the repulsive force between magnets having the same polarity during loading and unloading of the head so as to maintain a constant distance. do. Therefore, no particles are generated due to friction between the end-tab and the lamp, thereby reducing damage to the disk surface and the head. In addition, since friction does not occur between the end-tab and the ramp, the loading and unloading operations of the head can be performed stably.

In addition, when the magnet is made of a soft plastic magnet or a rubber magnet, or when a buffer coating is formed on the surface of the magnet, the magnet may be damaged or particles may be damaged due to collision between the magnets, which may occur when a strong impact is applied to the disk drive. It can be prevented from occurring.

1 is a plan view schematically showing the structure of a conventional hard disk drive.

FIG. 2 is an enlarged perspective view illustrating a suspension portion of the lamp and the actuator shown in FIG. 1.

FIG. 3 is a micrograph showing particles of the end-tab region shown in FIG. 2.

4 is a perspective view illustrating a ramp-loading head parking device of a disk drive according to an exemplary embodiment of the present invention.

5 is a side view of the head parking apparatus shown in FIG. 4.

FIG. 6 is a diagram for describing a head parking process by the head parking apparatus shown in FIG. 4.

7 is a partial cross-sectional view showing a state in which a coating film is formed on a surface of a magnet in a lamp-loading head parking device of a disk drive according to the present invention.

<Explanation of symbols for the main parts of the drawings>

120 ... disk 130 ... actuator

132 ... swing arm 133 ... suspension

134 ... Flexer 135 ... Slider

136 Dimples 137 End-Tap

138 ... first magnet 139 ... first coating

140 ... lamp 141 ... support

142 ... 2nd magnet 143 ... 2nd coating film

Claims (7)

A head parking device of a disk drive for parking a read / write head mounted on an actuator when a disk is stopped rotating, An end-tab extending from the suspension end of the actuator; And A lamp disposed adjacent the outer edge of the disk and having a support for supporting the end-tab when the disk stops rotating; Each of the end-tab and the support of the lamp is provided with a magnet for generating a repulsive force, so that the disk is loaded and unloaded without the end-tab and the support is in contact with each other Head parking device. The method of claim 1, A first magnet is installed on a surface of the end-tab facing the support part, and a second magnet is installed on a surface of the end-tab opposite the end-tab, and the first magnet and the second magnet have the same polarity. A head parking device of a disk drive, characterized in that arranged to face each other. The method of claim 1, A first magnet is installed on a surface of the end-tab facing the support part, the support part is formed of a second magnet, and the first magnet and the second magnet are disposed so that the same polarities face each other. Head parking unit of the disk drive. The method of claim 2 or 3, And the first magnet and the second magnet are permanent magnets. The method of claim 2 or 3, And the first magnet and the second magnet are made of a soft plastic magnet or a rubber magnet. The method of claim 2 or 3, Head parking device of the disk drive, characterized in that the coating film is formed on each of the surface of the first magnet and the second magnet having a buffer. The method of claim 2 or 3, And the end-tab is bent in a direction away from the surface of the disk.