KR19990024491A - Noise reduction method and device in hard disk drive - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs:

It is about a hard disk drive.

I. The technical problem the invention is trying to solve:

Reduces noise generated by hard disk drives.

All. The gist of the solution of the invention:

The present invention attaches a liquid-type voile coil motor damper to the site where the voice coil motor is located on the inner side of the hard disk drive cover in order to absorb vibration generated when the actuator is flying on the disc.

la. Important uses of the invention:

Hard disk drive

Description

Noise reduction method and device in hard disk drive

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disk drives, and more particularly, to a method and apparatus for reducing noise generated in a hard disk drive (hereinafter referred to as HDD).

In general, HDD is widely used as a secondary storage device of a computer, and unlike FDD (Floop Disk Drive), disks are embedded in a sealed container as in the example of FIG. 1. 1 is a view showing the mechanical configuration of a typical HDD. Referring to FIG. 1, the conventional disks 2 are clamped by fitting clamp holes stacked on the shaft of the spindle motor 1. Spacers (not shown in Fig. 1) are provided with spaces in which the magnetic head 3 and the like can be moved in a horizontal position between the disks 2 stacked in a stack. The magnetic heads 3 correspond to each disk of the disks 2 which rotate at high speed by the spindle motor 1, and maintain a certain flight altitude on each disk, and read data recorded in a track formed in the circumferential direction of the disk. Record the data. The magnetic head 3 is provided at the tip of the actuator 4. The actuator 4 causes the magnetic head 3 to move in the radial direction of the disk by servo control and to be positioned on a specific track. The actuator 4 is mounted with an arm 6, which is a metal gimbal of the head gimbal 5 including the magnetic head 3. In addition, a pivot 8 fixed to the base 7 is installed at an intermediate portion of the actuator 4, and the actuator 4 is rotated left and right about the pivot 8. At the rear of the actuator 4 is a bobbin 9 wound around a coil coil motor (VCM) coil. VCM is composed of the VCM coil and the magnets in the VCM yoke 10 and the VCM yoke 10 shown in FIG. The servo driver, which operates according to the servo control command of the HDD controller, applies a drive current to the VCM coil, which causes the actuator 4 to rotate left and right in accordance with the direction and magnitude of the drive current. The rear portion of actuator 4 also has a latch portion that allows latching actuator 4 when head 3 is in the parking zone of disk 2. Since the base 7 of the HDD is covered with a cover 12 to be sealed, external devices such as dust or foreign matter cannot enter the mechanisms and circuit components on the base 2.

In FIG. 1, a VCM consisting of an actuator 4, a spindle motor 1, a VCM yoke 10 and a VCM coil and an internal magnet corresponds to a drive unit of the HDD, and a main noise source generated from the HDD is generated in the drive unit. The noise produced by spindle motor 1, which rotates discs 2, is usually about 27 dB, which represents a small percentage of the total noise produced by the drive. Therefore, most of the noise generated by the drive is generated when arm 6 of actuator 4 with heads 3 moves on the target track of the disc to read / write data to any one disc. In the past, active measures against noise generated by the drive unit were not necessary, but as the drive becomes larger and the data access time becomes faster, the noise can be further increased, and consumers can be sensitive. In addition, since noise generated from HDD is recognized as one of environmental pollution, it can act as a measure of reliability of HDD when compared with other products.

For these reasons, active anti-noise measures of HDD are required to satisfy consumer's needs.

Accordingly, an object of the present invention is to provide a noise reduction method and apparatus for reducing the noise generated in the HDD.

Another object of the present invention to provide a HDD noise reduction device that can satisfy the needs of consumers according to the high capacity HDD implementation.

According to the above object, the present invention, in the noise reduction method of the hard disk drive, when the liquid material is attached to the site where the voice coil motor on the inner surface of the hard disk drive cover when assembling the cover and the base The liquid material is in close contact with the upper surface of the upper yoke of the voice coil motor seated on the base.

In addition, the present invention, in the hard disk drive, in order to absorb the vibration generated when the actuator attached to the front end of the head for recording and reading information flying on the disk, the voice coil motor on the inner surface of the hard disk drive cover The liquid damper to be in close contact with the upper surface of the voice coil motor yoke is characterized in that the attachment portion.

1 is a view showing the mechanical configuration of a typical hard disk drive,

2 is a view showing a state in which a liquid VCM (Voice Coil Motor) damper is attached to an inner surface of a hard disk drive cover according to an embodiment of the present invention;

Figure 3 is a partial cross-sectional view showing a state in which the cover as shown in Figure 2 assembled to the base.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are denoted by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

2 is a view showing the inner surface of the HDD cover according to an embodiment of the present invention, the liquid damper 20 is attached to the portion where the inner surface VCM of the cover 12 is located. As shown in FIG. 2, the structure of the liquid damper 20 attached to the cover 12 is thin and is gradually wound inwardly along the outline of the VCM yoke (10 of FIG. 1) and a planar shape. In other words, it has a spiral structure similar to the VCD yoke plane outline.

3 is a partial cross-sectional view illustrating a state in which a cover 12 as illustrated in FIG. 2 is assembled to a base (7 of FIG. 1). When assembling the cover 12 with the liquid damper 20 attached to the base as shown in Figure 2, the liquid damper 20 is in close contact with the upper surface of the VCM upper yoke 22-1 seated on the base 7, as shown in FIG. . The structure of the liquid damper 20 acts as a damping material between the cover 12 and the upper yoke 22-1 of the VCM to absorb vibrations generated by the actuator (4 in FIG. 1) during the search and eventually reduce noise. Reference numeral 22-2, which is not described in FIG. 2, is a lower yoke of the VCM yoke, and reference numerals 24-1 and 24-2 are magnets attached to the upper VCM yoke 22-1 and the VCM lower yoke 22-2.

The liquid damper described above can be used in other models as the manufacturer can make any shape, thickness and width as desired. Accordingly, the present invention may be practiced without departing from the scope of the present invention as well as the specific embodiments in the foregoing description. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be defined by the equivalent of claims and claims.

As described above, the present invention attaches a liquid-type voice coil motor damper to a portion where the voice coil motor is located on the inner side of the hard disk drive cover, thereby absorbing vibration generated when the actuator is flying on the disk, and ultimately, the hard disk drive. Reduce the address sound source of.

Claims (2)

In the noise reduction method of the hard disk drive, The liquid material is in close contact with the upper surface of the upper yoke of the voice coil motor seated on the base when attaching the liquid material to the portion where the voice coil motor is located on the inner surface of the hard disk drive cover. Noise reduction method characterized in that. In the hard disk drive, In order to absorb the vibration generated when the actuator attached to the tip of the head for recording and reading the information is flying on the disk, the voice coil motor yoke is placed at the position where the voice coil motor is located on the inner side of the hard disk drive cover. Noise reduction device, characterized in that for attaching the liquid damper to be in close contact with the upper surface.