KR100464423B1 - Disc tray of disc drive decreasing vibration and noise, and disc drive comprising the same - Google Patents

Abstract

Disc trays for disc drives for vibration and noise reduction are disclosed. The disc tray for a disc drive according to the present invention, which is installed in a disc drive to mount a disc, allows the air flow generated at the top of the disc tray to flow into the bottom of the disc tray by rotation of the disc. At least one through hole formed through the upper and lower surfaces of the tray; And a guide plate disposed to be adjacent to a lower surface of the disc tray, the air flow flowing into the lower portion of the disc tray from the upper portion of the disc tray through the through hole does not flow out to the lower portion of the guide plate. And move to a center portion of the lower surface of the disk tray along a space between the lower surface of the disk tray and the upper surface of the guide plate. Therefore, there is an effect of reducing the vibration and noise generated by the flow introduced into the lower portion of the disk drive.

Description

Disc tray of disc drive decreasing vibration and noise, and disc drive comprising the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc drive, and more particularly to a disc drive disc tray for reducing vibration and noise generated when the disc is rotated.

In general, a disc drive is a device for recording information to or reading information from a recording surface consisting of concentric tracks on a disk. An optical pickup device that slides in a radial direction of a disk on a recording surface of a disk rotating in a linear speed manner. A device for recording data onto or reading data from a recording surface of a disc by irradiating a laser beam from the disk.

1 is a schematic perspective view of a conventional disk drive.

Referring to FIG. 1, a disc drive typically includes a disc tray 10 for mounting and loading a disc 60, a disc drive unit 20 for rotationally driving the disc 60, a chuck plate 31, and a disc chuck 32. And a disk chucking device 30 having an optical pickup device 40 for data recording / reproducing.

In order to accurately read the data recorded on the recording surface of the disc or to record the data accurately on the disc in the disc drive, the beam emitted from the optical pickup device 40 must enter the track of the recording surface of the disc accurately, The optical axis of the beam emitted from the optical pickup device 40 should always maintain a constant angle. However, when vibration occurs due to the rotating disk, recording and reproducing characteristics of the disk drive deteriorate. Moreover, as the disk drive becomes higher and higher, vibrations generated when the disk is rotated have a great influence on the reliability of data recording and reproducing. In addition, the noise generated when using most office equipment is directly related to the user's working environment and work efficiency. Therefore, it is very important to reduce or eliminate such noise and vibration.

Noise and vibration generated when the disc is rotating include friction between the surface of the disc and the surrounding air, pressure difference around the disc, the inner surface of the disc and the disc tray 10 and the disc drive being rotated. Air collisions in the doctor, perturbations caused by them, and turbulent flow around the rotating disks.

2 is a view for explaining the rotating flow of the upper portion of the rotating disk.

The turbulent flow caused by the rotation of the disc rotates in the same direction as the disc rotation direction between the top of the disc and the cover of the disc drive. That is, when the disk rotates clockwise, the flow also rotates clockwise. At this time, the rotating turbulent flow not only rotates around the disk but also passes through the disk tray 10, the window portion 11, the optical pickup device 40, and the gear portion (not shown) located below the disk tray 10. Perturbations are formed when they collide with the surrounding structure, which causes vibration and noise inside the disk drive. In particular, the vibration and noise due to the flow that collides with the disk drive front part are the greatest, and the noise emitted through the disk drive front part is most recognized by the user.

Conventionally, in order to reduce noise and vibration generated in the disk drive, a through hole having a predetermined size is provided in the front surface of the disk tray.

The through-holes are provided at the site where the turbulent flow, which is generated due to the rotation of the disk, rotates in the same clockwise direction as the disk rotational direction and returns to the outer circumferential direction of the disk, collides particularly strongly at the front surface of the disk. Thus, the rotating turbulent flow enters the bottom of the disc tray through the through-holes before it impinges on the front of the disc drive and is released outward. This reduces the noise emitted from the front of the disk drive to the outside.

However, the flow introduced into the lower part of the disk drive has a problem of generating new vibrations and noises by colliding with components and structures such as a gear device provided under the disk drive.

Accordingly, an object of the present invention is to provide a disk drive that reduces vibration and noise caused by a flow flowing into a lower portion of a disk drive.

1 is a schematic perspective view of a conventional disk drive.

2 is a view for explaining the rotating flow of the upper portion of the rotating disk.

3 is a schematic perspective view for explaining the configuration of the disk drive and the flow of airflow according to the present invention.

Figure 4a schematically shows the velocity distribution of the flow in the disk rotation direction (theta direction) on the top of the rotating disk.

4B is a view for explaining turbulent flow on the rotating disk surface caused by the rotation of the disk.

4C is a diagram for explaining turbulent flow in the free fluidized bed caused by the rotation of the disk.

FIG. 4D is a view for explaining turbulent flow in the upper cover surface of the disk drive caused by the rotation of the disk. FIG.

5 is a view showing a flow caused by the rotation of the disk and the position where the noise intensity according to the flow is large.

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

10,110 ...... Disc tray 112 ...... Through hole

114 ... Guide Plate 116 ... Guide Vane

118 ...... Airflow entering the bottom of the disc tray

20,120 ...... Disc drive 30,130 ...... Chucking device

40,140 ... optical pickup device 60,160 ... disc

70,170 ...... Top cover 80,180 ...... Rotating turbulence

90,190 ...... Disc Tray Loading Unit

In order to achieve the above object, the disc tray for a disc drive according to the present invention, which is installed in a disc drive and mounts a disc, the airflow generated at an upper portion of the disc tray by the rotation of the disc. At least one through hole formed through the upper and lower surfaces of the disc tray to be introduced into the lower portion; And a guide plate disposed to be adjacent to a lower surface of the disc tray, the air flow flowing into the lower portion of the disc tray from the upper portion of the disc tray through the through hole does not flow out to the lower portion of the guide plate. And move to a center portion of the lower surface of the disk tray along a space between the lower surface of the disk tray and the upper surface of the guide plate.

A disk tray loading unit and a disk tray loading unit which are installed to be accessible to the disk drive to mount the disk, and a disk tray loading unit provided below the disk tray in the front portion of the disk drive to allow the disk tray to enter and exit the disk drive at a predetermined speed. The disc drive according to the present invention has a disc drive unit for rotating, a disc chucking device for chucking the disc, and a data recording / reproducing unit for recording data to or reading data from the disc, by rotating the disc. At least one through hole formed through the top and bottom surfaces of the disc tray such that air flow generated at the top of the disc tray flows into the bottom of the disc tray; And a side of the disk tray disposed adjacent to the lower surface of the disk tray so that airflow flowing from the upper portion of the disk tray to the lower portion of the disk tray through the through hole does not flow out to the disk tray loading unit provided at the lower portion of the guide plate. And a guide plate to prevent the air flow flowing through the through hole from being moved to the center portion of the bottom surface of the disc tray along a space between the bottom surface of the disc tray and the top surface of the guide plate.

In the present invention, the guide plate, characterized in that it comprises a guide vane for guiding the air flow introduced from the upper portion of the disk tray through the through hole to the center portion of the lower surface of the disk tray;

According to such a disk drive disk tray and a disk drive having the same according to the present invention, there is an effect of reducing the vibration and noise caused by the flow flowing into the lower portion of the disk drive.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The disc drive according to the present invention includes a disc tray 110, a disc drive unit 120, a disc chucking device 130, a data recording / reproducing unit such as an optical pickup device 140, and a recording / reproducing unit driver 150. .

The disk tray 110 is installed to be accessible to the front of the disk drive, and mounts the disk to enable loading or unloading of the disk.

The disc tray loading unit 190 is provided below the disc tray of the front portion of the disc drive, and is composed of a motor, a gear, a belt, and the like, and makes the disc tray 110 accessible.

The disk drive unit 120 includes a turntable on which the disk is seated and a spindle motor for rotationally driving the turntable to rotate the disk seated on the turntable at a predetermined speed.

In addition, the disk chucking device 130 has a magnetic material that is selectively attached to the magnet provided in the center of the turntable serves to fix the disk 160 to the rotating shaft.

The data recording / reproducing unit 140 serves to record data on the recording surface of the disk or to reproduce data from the recording surface of the disk. In particular, in the optical disk drive, the data recording / reproducing unit may be implemented by the optical pickup device 140. The optical pickup device 140 includes a laser diode as a light source, a collimating lens for parallelizing the emitted light, a polarizing prism, a mirror, and an objective lens, and radially slides the laser about a rotating disk. The beam is irradiated to record data on or read from the disk recording surface.

In addition, the optical pickup device driver 150 slides the optical pickup device 140 in the radial direction with respect to the rotating disk having a motor, gear or belt.

The mechanism by which the airflow caused by the rotation of the disk returns to the outer circumferential direction of the disk 160 will be described as follows. The equation governing the flow on the rotating disk can be expressed as Equation 1 below.

Where u is the radial flow rate and v is the disk rotation speed. At this time, the viscous term is ignored and the pressure gradient term in the radial direction r Is assumed to be constant. FIG. 4A is a view for explaining the distribution of the speed v of the disk rotation direction between the inner wall of the top cover plate 170 and the rotating disk 160. On the inner wall of the top cover plate 170, v = 0. Disc rotational angular velocity In the radial direction from the center of rotation of the disc The disk rotational linear velocity at the position Becomes The velocity distribution between the rotating disk 160 from the inner wall of the non-rotating top cover plate 170 is the area A, the boundary layer near the inner wall of the top cover plate 170, and the area C, the boundary layer near the rotating disk, and the freedom therebetween. There is a B zone, which is a fluidized bed. In other words, the areas A and C are boundary layers, and the air flow is markedly affected by the frictional resistance of the boundary surface, that is, the inner wall of the top cover plate 170 or the disk 160, and the zone B is a free fluidized layer separated from the boundary surface to some extent. It is a region and free flow velocity away from the influence of the interface.

4B shows the flow on the rotating disk 160 plane. On the rotating disk 160 plane Since the speed square term is relatively larger than the pressure gradient term, the right side of Equation 1 is positive. Therefore, on the rotating disk surface the outer diameter ( Airflow in the) direction is caused. In the inner wall of the upper cover plate 170, since v = 0, only the pressure gradient term remains, and the right side of Equation 1 becomes negative. Therefore, referring to FIG. 4D, the inner diameter of the inner cover plate 170 may be Direction is induced. In addition, referring to FIG. 4C, since the velocity square term on the right side of Equation 1 is relatively large in the free fluidized bed, the outer diameter ( Direction is induced.

The disk drive according to the present invention is provided with at least one through hole 112 formed through the upper and lower surfaces of the disk tray 110. The through hole 112 is provided in a predetermined size in the front portion of the disc tray to reduce noise and vibration generated in the disc drive.

The through hole 112 is generated due to the rotation of the disk, rotates in the same clockwise direction as the rotational direction of the disk, and is provided at a portion where the turbulent flow that returns to the outer circumferential direction of the disk collides particularly strongly at the front surface of the disk. Thus, the rotating turbulent flow enters the bottom of the disc tray through the through-holes before it impinges on the front of the disc drive and is released outward. This reduces the noise emitted from the front of the disk drive to the outside.

5 is a diagram showing a position caused by the disk rotation and the noise intensity according to the flow is large. Here, the noise intensity is greatest at the M position of the front part and the N position of the rear part.

Referring to FIG. 5, the flow in the boundary layer and the free fluid layer near the disc and directed toward the disc circumferential direction by the rotation of the disc is rotated clockwise by the clockwise rotation and flows out in the circumferential direction. Rotate on the inner wall of the. Therefore, the overall air flow in the disk drive is formed to rotate in the shape of an ellipse with a large curvature to the front of the disk drive and a small curvature to the rear of the disk drive. In terms of noise intensity, it is as follows. That is, the airflow flowing in the circumferential direction clockwise from the rotating disk of the disk drive impinges on the side of the disk drive to form a perturbation, turbulence, etc. and faces the front part. Therefore, the strongest airflow in the M position is emitted outside the disk drive, causing a loud noise. Similarly, at position A and at position N, which is symmetrical to the center of rotation of the disk, strong airflow is emitted and a loud noise is generated.

However, the flow introduced into the lower part of the disk drive has a problem of generating new vibrations and noises by colliding with components and structures such as a gear device provided under the disk drive. In other words, the airflow 118 introduced into the lower portion of the disc tray through the through hole 112 collides with the structure of the disc tray loading unit 190 and the components of the disc tray loading unit 190 provided under the disc tray, thereby causing noise. It is to generate a perturbation component.

The guide plate 114 is inserted and provided to prevent perturbation caused by collision of the airflow introduced into the through hole 112 with the structure of the disc tray loading unit 190 and the motors, gears, and the like. .

In the disk drive according to the present invention, the guide plate 114 is installed adjacent to the lower surface of the disk tray 110 side by side.

When the through hole 112 and the guide plate 114 are provided in the disc tray 110 as described above, the airflow introduced into the lower portion of the disc tray 110 from the top of the disc tray 110 through the through hole 112 ( 118 does not flow out to the bottom of the guide plate 114. Therefore, the disk tray loading unit 190 positioned below the disk tray 110 and the introduced airflow 180 do not collide, and thus there is no perturbation. Then, the introduced airflow 118 is moved to the center portion of the disc tray along the space between the bottom surface of the disc tray 110 and the top surface of the guide plate 114.

On the other hand, the airflow flowing from the upper portion of the disk tray to the lower portion through the through hole 112 is moved to the center portion of the disk tray, the strength of the perturbation component and turbulence is weakened by the frictional force of the wall surface.

In the disc drive according to the present invention, the air flow guides the airflow to effectively reduce the perturbation component and turbulence intensity of the airflow induced by the guide plate 114 at the bottom of the disc tray and prevent the generation of new perturbation components. An optional guide vane may be further provided to more effectively reduce noise generated by the disk drive.

As described above, according to the disk drive disk tray and the disk drive having the same according to the present invention, there is an effect of reducing the vibration and noise generated due to the flow introduced into the lower portion of the disk drive.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.

Claims (4)

In the disk tray for a disk drive that is installed in the disk drive to mount the disk, At least one through hole formed in a front portion of the disc tray and penetrating through the top and bottom surfaces of the disc tray such that air flow generated at the top of the disc tray by the rotation of the disc flows into the bottom of the disc tray; And And a guide plate installed adjacent to the bottom surface of the disc tray in parallel with each other. The airflow flowing from the upper part of the disk tray to the lower part of the disk tray through the through hole does not flow out to the lower part of the guide plate, but along the space between the lower surface of the disk tray and the upper surface of the guide plate. A disk tray for a disk drive, characterized in that moved to the center of the lower surface. The method of claim 1, wherein the guide plate, And a guide vane for guiding the air flow introduced from the upper portion of the disk tray to the lower portion of the disk tray to move to the center portion of the lower surface of the disk tray. A disc tray loading unit installed in the disc drive to mount the disc and a disc tray loading unit provided below the disc tray in the front part of the disc drive to rotate the disc at a predetermined speed; A disk drive having a disk drive unit, a disk chucking device for chucking the disk, and a data recording / reproducing unit for recording data to or reading data from the disk, At least one through hole formed in a front portion of the disc tray and penetrating through the top and bottom surfaces of the disc tray such that air flow generated at the top of the disc tray by the rotation of the disc flows into the bottom of the disc tray; And It is installed adjacent to the lower surface of the disk tray side by side, so that air flow flowing from the upper portion of the disk tray to the lower portion of the disk tray through the through hole does not flow out to the disk tray loading unit provided in the lower portion of the guide plate. A guide plate to be provided, And a stream of air flowing through the through hole is moved to a central portion of the lower surface of the disk tray along a space between the lower surface of the disk tray and the upper surface of the guide plate. The method of claim 3, wherein the guide plate, And a guide vane for guiding the airflow flowing from the upper portion of the disk tray to the lower portion through the through hole to move to the center portion of the lower surface of the disk tray.