KR100353719B1 - Device for controlling lifting height of hard disc drive head by using blade panel - Google Patents

Abstract

PURPOSE: A device for controlling a lifting height of a head of a hard disc drive by using a blade panel is provided to realize the non-contact start/stop by attaching a blade panel to a lower part of a suspension, thereby extending the lifespan of a hard disc drive and controlling an error of the lifting height of the head due to the manufacturing clearance. CONSTITUTION: A device for controlling a lifting height of a head of a hard disc drive by using a blade panel includes a suspension(16) attached to a swing arm(14) of an actuator for keeping a uniform interval from a disc(28) to a head, a blade panel(24) positioned at a lower part of the suspension for lowering the suspension to a predetermined height on the disc by air pressure generated by the rotation of the disc, a piezo-electric element(22) positioned at a lower part of the suspension and coupled with the blade panel for compensating fine displacement caused by the extension and compression of the suspension, a piezo-electric element control circuit(30) connected to the piezo-electric element for applying a power control signal to the piezo-electric element for recovering an error resulted from the comparison between a signal read from the disc and a preset reference read signal, gimbals(18) attached to an end of the suspension, and the head(20) connected to the gimbals for accessing the data from the disc.

Description

Head lift height control device of hard disk drive using wing plate.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk drive, and more particularly, to a head lift height control apparatus of a hard disk drive for controlling a height of head lift using a vane plate.

A hard disk drive is a device that magnetically writes / reads data on a rotating magnetic disk and is widely used as a secondary storage device of a computer system because it can access a large amount of data at high speed. Recent trends in technology for hard disk drives have gradually increased TPI (Track Per Inch) to maximize data storage capacity, while increasing the head height to improve data access as TPI increases. Techniques for keeping low and constant have been actively studied. In general, a hard disk drive is in a state in which the disk surface and head are in contact with each other. When the power is turned on, the disk is rotated by the spindle motor, and the head maintains a certain level of injury due to the air pressure on the disk. Lose. On the other hand, when the drive power is "off" or the drive power is "off" due to an accident while the hard disk drive is operating normally, the hard disk drive moves the head located in the data area to the parking area. Then stop the spindle motor slowly. This causes the air pressure on the disk to decrease gradually, thereby lowering the lift height of the head, thereby bringing the head and disk surfaces into contact with each other.

As described above, the conventional hard disk drive has contact friction between the head and the disk surface when the driving power is switched from the "off" state to the "on" state or when the driving power of the driving hard disk drive is switched to the "off" state. A microscopic crash occurs (called a contact start stop (CSS)). This can be a major cause of hard disk drive life as it continues to damage the head or disk as it continues to be used. On the other hand, after manufacturing the actuator of the conventional hard disk drive, there is a disadvantage in that the height of the head cannot be controlled. In other words, the error of the height of the lift caused by the manufacturing tolerances of the entire head including the manufacturing tolerances such as the head slider and the suspension cannot be controlled differently. The head slider means a main body to which a head can be attached, and the head and the head slider are generally named as the case may be.

As described above, the conventional hard disk drive has a problem that the life of the hard disk drive is shortened due to the collision of the head and the disk due to the contact start stop method, and at the same time, it is not possible to control the error of the head injury height due to manufacturing tolerances. There was this.

Accordingly, an object of the present invention is to provide a head lift height control apparatus of a hard disk drive that can prevent the head height and the disc height from being lost due to manufacturing tolerances while preventing contact between the head and the disc at the start and stop of the spindle motor.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In the following description of the present invention, detailed descriptions of related known functions or configurations will be omitted if it is determined that the detailed descriptions may unnecessarily obscure the subject matter of the present invention.

1 shows a perspective view of a head actuator according to the invention. In FIG. 1 the head 20 is attached to the gimbal 18 at the end of the suspension 16 of the swing arm 14. The swing arm 14 rotates on the disk about the pivot bearing shaft 12 through the current control of the VCM 10, and the head 20 moves to a specific position on the disk (not shown) according to the rotational motion. Navigate to to read or write data. At this time, in order to prevent data damage due to contact between the head 20 and the disk, the head 20 has a certain height of rise 26 on the disk 28 as shown in FIG. The head 20 is attached by the gimbal 18 to the end of the stainless steel leaf spring (hereinafter referred to as "suspension") as shown in Figure 2, the suspension 16 is again attached to the swing arm 14 do.

2 is a front view of the head actuator according to the present invention seen in the direction A of FIG. The head actuator shown in FIG. 2 is a swing arm 14, a suspension 16 fastened to the swing arm 14, a lower portion of the suspension 16, and a disk 28 positioned on the disk 28. FIG. Wing plate 24 for lowering the suspension 16 to the disk 28 surface by the flow of fluid generated during startup, and is located in the lower portion of the suspension 16 and coupled with the wing plate 24 suspension The piezoelectric element 22 for compensating for the micro displacement due to the tension and compression of the 16 and the lead signal connected to the piezoelectric element 22 and read from the disk 28 are compared with the reference lead signal. Piezoelectric element control circuit 30 for controlling the power applied to the piezoelectric element 22 to recover the error generated, the gimbal 18 attached to the end of the suspension 16, and the gimbal 18 And a head 20 connected to and accessing data from the disk 28.

FIG. 3 shows that when the disk 28 rotates at the normal speed, the height of the lift 26 of the head is lowered by the force of the fluid acting on the wing plate 24 of the head actuator having the structure of FIG. 2 described above. 4 is a lead signal read from the disk 28 when the head plate height 26 is to be controlled by changing the position, size, and shape of the vane 24 using the piezoelectric element 22. The block diagram of the piezoelectric element control circuit 30 for controlling the power applied to the piezoelectric element 22 according to the size of FIG.

Hereinafter, operation examples of the present invention will be described in detail with reference to FIGS. 2 to 4.

First, the position, size, shape, and attachment angle of the wing plate 24 in FIG. 2 should be designed differently depending on the height of the head 20 and the shape of the head slider to be implemented. When the disk 28 is stopped, the head 20 is sufficiently largely isolated from the surface of the disk 28 so that the head 20 has a constant floating height 26 as shown in FIG. The floating height of the head 20 by the force that the fluid flow exerts on the wing plate 24 is equal to the floating height 26a as shown in FIG. In other words, the force of the fluid acting on the wing plate 24 lowers the suspension 16 vertically to maintain the desired head 20 and the disk 28. At this time, the suspension 16 serves to cancel the force lowered by the force of the fluid in order to prevent the impingement of the head 20 and the disk 28. In addition, the shape of the head slider is not limited according to the design of the wing plate 24 and the suspension 16 and may be designed to help the role of the wing plate 24 or suspension 16 as necessary. On the other hand, the schematic block diagram of the piezoelectric element control circuit 30 for feedback control of the error of the head floating height caused by manufacturing tolerances by minutely controlling the attachment position, attachment angle, shape, etc. of the wing plate 24 is shown. 4 is shown. If an error in the height of the head rises due to the manufacturing tolerances of the vane 24 or the suspension 16, the read signal read out from the head 20 is changed in accordance with the error of the height. Therefore, in order to finely control the error of the head floating height 26a caused by the manufacturing tolerance, the controller 32 compares the predetermined reference read signal with the read signal read from the head 20. Thereafter, the control unit 32 transmits a power control signal to the piezoelectric element 22 to tension or compress the suspension 16 in response to a comparison error between the reference lead signal and the read signal read from the head 20. (Hereinafter referred to as PCS). The piezoelectric element 22 is tensioned or compressed in response to the power control signal PCS applied from the control unit 34 to change the position, angle, shape, and the like of the wing plate 24 so as to finely displace the head floating height on the disk 28. Can be controlled.

As described above, the present invention can extend the life of the hard disk drive by implementing the non-contact start stop by attaching only the wing plate to the bottom of the suspension, and using the piezoelectric element and the piezoelectric element control circuit to raise the head height due to manufacturing tolerances. This has the advantage of controlling the error.

Meanwhile, in one embodiment of the present invention, the non-contact start stop hard disk drive is implemented by placing the wing plate under the suspension, but the non-contact start stop hard disk drive is attached to the gimbal or the head slider without any modification. It can also be implemented.

1 is a perspective view of an actuator according to the present invention.

2 is a front view of the actuator seen from the direction A of FIG.

Figure 3 is a front view of the actuator for explaining the cause of having a certain height of injury due to the flow of fluid acting on the blade plate during the constant speed rotation of the disk.

4 is a configuration diagram of the generator control circuit of FIG.

Explanation of symbols for main parts of the drawings

10: Voice Coil Motor (VCM) 12: Pivot Bearing

14: Swing arm 16: Suspension

18: Gimbal 20: Head

22: piezoelectric element 24: wing plate

26: Head Float Height (HFH) 28: Disc

Claims (2)

In the head lift height control device of a hard disk drive using a wing plate, A head support mechanism attached to a fixed support arm of an actuator arranged to maintain a predetermined distance from the disk on which the head is stationary; A head slider capable of floatingly supporting the head on a rotating disk; A gimbal for attaching the head slider to the support mechanism; A wing plate positioned below the support mechanism and lowering the support mechanism to a predetermined height on the disk by air pressure generated when the disk is rotated; Support mechanism control means for applying a power control signal to the piezoelectric element for compensating for errors caused by manufacturing tolerances of the support mechanism in response to a comparison error between the read signal read from the head and a predetermined reference lead signal during the constant speed of the disc rotation; , And a piezoelectric element connected to the vane and configured to tension or compress the support mechanism in response to a power control signal applied from the support mechanism control means. The apparatus of claim 1, wherein the vane is attached to the gimbal.