KR100469963B1 - Disc Driving Apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a disk vibration preventing device in which a disk drive device having a tray for transporting a disk to an access position in the disk drive device is made to equalize the pressure difference between the upper space and the lower space around the disk.

The disc drive device according to the present invention is provided with a pressure equalizing member for equalizing the pressure in the tray by the rotation of the disc.

According to this configuration, the disk vibration preventing device according to the present invention is the upper side relative to the disk by making the upper space equal to the lower space by the pressure equalizing member for adjusting the spatial degree of the upper space relative to the disk. The pressure difference in the space and the lower space can be equalized.

Description

Disk Driving Apparatus}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc drive device for recording and / or playing a disc medium, and more particularly to a disc drive device having a tray for transferring a disc to an access position in the disc drive device. A disk drive device is provided so as to equalize the pressure difference.

Usually, the disc drive device is provided with a tray for transferring the disc to the access position by the power of the motor so that the disc is loaded correctly. Referring to FIG. 1, a disc drive device includes a tray 2 for transferring a disc 1 to an access position, a spindle motor 6 for rotating the disc 1, and a clamp for clamping the disc 1. The clamper 8 is provided. When the tray 2 in which the disk 1 is accommodated is transferred to an access position in the disk drive and reaches a load completion point, the spindle motor 6 is lifted to a certain height. Then, the central cone 6b of the spindle motor 6 is fitted into the hole of the disk 1 and the disk 1 is seated on the turntable 6a. As the spindle motor 6 is lifted up, the disk 1 is brought into close contact with the turntable 6a by the mutual magnetic force between the clamper 8 installed on the deck housing 4 and the central cone 6b. . At this time, the space δ1 (hereinafter referred to as “upper space”) from the upper surface of the disk 1 to the inner upper wall of the deck housing 4 and the space δ2 (hereinafter referred to as “upper space”) from the lower surface of the disk 1 to the storage surface of the tray 2 "Lower space" is different. That is, as can be seen from the figure, the upper space δ1 becomes a significantly larger space δ1 >> δ2 than the lower space δ2. When the disk 1 is rotated by the drive of the spindle motor 6 according to the command of the recording mode or the reproducing mode, air flow that flows from the upper side of the disk 1 to the lower side of the disk is generated. The pressure gradient according to the air flow in the upper space δ1 and the lower space δ2 is P1 << P2 when the pressure in the upper space δ1 is P1 and the pressure in the lower space δ2 is P2 due to the difference between the upper space δ1 and the lower space δ2. do. This pressure difference causes the disk 1 to vibrate and oscillate and is a direct cause of noise. In fact, when there is no tray 2 (that is, when the pressure difference between the upper space δ1 and the lower space δ2 is small with respect to the disk) and when the tray 2 is present (that is, with the upper space δ1 and lower relative to the disk) The experimentally measured noise level when the disk 1 is rotated at 6500 rpm in different driving environments in the case of a large pressure difference in the space δ2 is as follows. In the disk drive without the tray 2, 74 dB of noise was measured, while in the disk drive with the tray 2, 81 dB of noise was measured.

On the other hand, the vibration of the disc 1 due to the pressure difference between the upper and lower surfaces makes the servo control such as focusing and tracking difficult during recording or playback, resulting in a problem of unstable recording or playback. This difficulty of servo control becomes more problematic when recording or reproducing a disc having a high density recording capacity.

Accordingly, it is an object of the present invention to provide a disk drive device that equalizes the pressure difference between the upper space and the lower space with respect to the disk.

Another object of the present invention is to provide a disk drive device for minimizing vibration and swing of a disk.

It is another object of the present invention to provide a disk drive device for minimizing noise.

A further object of the present invention is to provide a disk drive device which ensures reliability in recording or reproducing.

In order to achieve the above objects, the disc drive device according to the present invention has a pressure equalizing member for equalizing the pressure in the tray by the rotation of the disc.

Other objects and advantages of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3.

2 is an exploded perspective view of a disc drive device according to an embodiment of the present invention. 3 is a longitudinal cross-sectional view for illustrating a fastening structure when the disc driving device shown in FIG. 2 is assembled.

In the configuration of FIGS. 2 and 3, the disc drive device according to the present invention includes a tray 12 in which the disc 1 is accommodated, and a pressure equalizing member for adjusting the space degree of the upper space based on the disc 1. And a clamp holder 18 on which the pressure equalizing member 16 is provided. The tray 12 is installed in the deck housing 14 to be linearly driven to serve to transfer the disk 1 to the access position in the deck housing 14. The tray 12 is provided with an accommodating surface 12a in which the disk 1 is accommodated and a stepped surface 12b for supporting the pressure equalizing member 16. The pressure equalizing member 16 minimizes the pressure difference in the upper space δ1 and the lower space δ2 by setting the upper space δ1 to the disk 1 to be equal to or less than the lower space δ2 (δ1 ≦ δ2). Minimize the vibration and noise of the. The pressure equalizing member 16 is supported by the step surface 12b of the tray 12 so as to be located on the opposite side of the receiving surface 12a of the tray 12 with the disk 1 interposed therebetween. The pressure equalizing member 16 is formed in an annular plate shape having an annular hole 16a formed at the center thereof and having a diameter larger than the diameter of the disk 1. The pressure equalizing member 16 is injection molded from an elastic material (for example, a polymer composite such as polycarbonate). According to the experimental results, in the relationship between the vertical axis position of the disk 1 and the swing amount of the disk, the larger the upper space δ1 than the lower space δ2 relative to the disk 1, the larger the swing amount of the disk 1 becomes. That is, when the upper space δ1 between the lower surface of the pressure equalizing member 16 and the upper surface of the disk 1 is equal to or smaller than the lower space δ2 between the receiving surface 12a of the tray 1 and the lower surface of the disk 1, the disk ( The amount of swing of 1) is reduced, and the amount of swing of the disk 1 is reduced. In particular, when the rotational speed of the disk 1 increases at a higher speed, the amount of swing of the disk 1 is minimized when the position of the disk 1 is designed such that the upper space δ 1 is smaller than the lower space δ 2. The relationship between the upper space δ1 and the lower space δ2 can be easily adjusted by adjusting the height of the step surface 12b supporting the pressure equalizing member 16. The clamp holder 18 is formed with an annular projection 18a and a support wing 18b protruding horizontally from the annular projection 18a. The pressure equalizing member 16 is fitted to the annular projection 18a of the clamp holder 18 and is restrained by the support blades 18b so as not to be separated from the annular projection 18a. Thus, the pressure equalizing member 16 is fastened to the clamp holder 18 in a flowable manner. Alternatively, the pressure equalizing member 16 may be fastened to be fixed to the clamp holder 18.

The disk drive device according to the present invention further includes a clamper 20 for clamping the disk 1 and a spindle motor 22 for rotating the disk 1. The clamper 20 clamps the disk 1 on the turntable 22a by a force that magnetically attaches to the spindle motor 22. This clamper 20 is movably fastened to a space inside the annular projection 18a of the clamp holder 18. The spindle motor 22 is supported on a sled base (not shown) along with the optical pickup. The sled base is driven up when the tray 12 is linearly driven and reaches the rod completion point, thereby lifting the spindle motor 22 so that the disk 1 is seated in the turntable 22a and at the same time the central cone is in the disk 1 hole. Make sure 22b is fitted. When the driving of the sled base is stopped, the clamper 20 is brought into close contact with the disk 1 with the magnetic force to the turntable 22a, thereby bringing the state as shown in FIG. 2. At this time, the pressure equalizing member 16 is placed on the stepped surface 12b of the tray 12.

When the disk 1 rotates at an arbitrary angular velocity Ω, the air flow presses the pressure equalizing member 16 to the step surface 12b of the tray 12 by adsorbing the pressure equalizing member 16 toward the disk 1. Let's do it. Then, the upper space δ1 between the lower surface of the pressure equalizing member 16 and the upper surface of the disk 1 is equal to or less than the lower space δ2 between the receiving surface of the tray 12 and the lower surface of the disk 1.

On the other hand, an opening window for securing an access space and a clamping space is formed in the storage surface of the tray 12. Asymmetric airflow occurs in this opening. In order to reduce the asymmetrical air flow, the pressure equalizing member 16 may be provided with at least one air flow guide hole for guiding the air flow to the outside (that is, above the pressure equalizing member). In this case, the air flow guide hole formed in the pressure equalizing member 16 may be formed to face the opening formed in the tray 12. The disk drive apparatus according to the present invention is provided with a conventional driving environment without the pressure equalizing member 16 (that is, a large pressure difference between the upper space δ1 and the lower space δ2 relative to the disk) and the pressure equalizing member 16. When the disk 1 is rotated at 6500 rpm in a driving environment, the measuring point is 15 points on the disk 1 and the tray 2 as shown in FIG. 4 (a, b, c, d, e, f, g, h, The noise level difference experimentally obtained in I, j, k, l, m, n, p) is shown in FIG. 5.

Referring to FIG. 5, the noise in the driving environment in which the pressure equalizing member 16 is present at all of the measurement points of 15 points is less noise than the conventional driving environment in which the pressure equalizing member 16 is not present. In particular, the measurement points of a, c, d, f, n, g and the like shows a significantly large noise level difference depending on the presence or absence of the pressure equalizing member 16. As can be seen in FIG. 5, in the driving environment in which the pressure in the upper space δ1 and the lower space δ2 is equalized with respect to the disk 1 by the pressure equalizing member 16, the noise in the driving environment does not have the pressure equalizing member 16. The noise in the driving environment will be less at all of the surrounding measuring points, including the disc 1.

As described above, the disk drive apparatus according to the present invention is the upper space on the basis of the disk by equalizing the upper space to the lower space by the pressure equalizing member for adjusting the spatial degree of the upper space on the basis of the disk. The pressure difference in the lower space can be equalized. Disc drive device according to the present invention can minimize the vibration and vibration of the disk and the noise due to the vibration and vibration of the disk by making the upper space to the lower space equal to or less than the disk by the pressure equalizing member Will be. Furthermore, the disc drive device according to the present invention can facilitate servo control by minimizing vibration and fluctuation of the disc, thereby ensuring reliability during recording or reproducing.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a longitudinal sectional view showing a conventional disc drive device.

Figure 2 is an exploded perspective view showing a disk drive apparatus according to an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view when the disk drive shown in FIG. 2 is assembled;

4 is a view showing measurement points for measuring noise in a disc drive device of the present invention and a conventional disc drive device.

FIG. 5 is a diagram illustrating noise levels measured in different driving environments at the measurement points of FIG. 4. FIG.

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

1: disc 2,12: tray

4,14: deck housing 6,22: spindle motor

8,20: clamper 16: pressure equalizing member

18: clamp holder

Claims (12)

In the disk drive device having a tray for storing a disk, And a pressure equalizing member for equalizing the pressure in the tray by the rotation of the disk. The method of claim 1, And the pressure equalizing member is positioned on the opposite side of the tray with the disk interposed therebetween. The method of claim 1, And the distance between the pressure equalizing member and the disk is approximately equal to the distance between the tray and the disk. The method of claim 1, The pressure equalizing member is a disk drive, characterized in that the annular plate shape. The method of claim 1, The pressure equalizing member is a disk drive device, characterized in that the high elastic material. The method of claim 1, The pressure equalizing member is a disk drive, characterized in that the polymer composite. The method of claim 1, And a stepped surface for supporting the pressure equalizing member is formed in the tray. The method of claim 1, And a support member for supporting the pressure equalizing member. The method of claim 8, The support member is a disk drive, characterized in that the clamp holder for supporting the clamper. The method according to claim 8 or 9, The pressure equalizing member is a disk drive device, characterized in that installed in the support member to flow. The method of claim 1, The pressure equalizing member is a disk drive device characterized in that the inner hole is formed during the at least one air oil to guide the air flow. The method of claim 11, And the inner hole during the air oil is formed in the pressure equalizing member to face the opening formed in the tray.