KR100298553B1 - Disc driving device - Google Patents

Abstract

PURPOSE: A disc driving device is provided to dispose a supporting element for supporting a disc to position the disc at the center of a vertical shaft of the cartridge or higher in the cartridge, thereby minimizing the vibration of the disc when the disc rotates and stabilizing the rotation of the disc for the reliable recording or reproducing. CONSTITUTION: A disc driving device includes a disc supporting element such as a turn table(16b) for supporting a disc(12) at a height set to be higher than a supporting surface of a cartridge(10) by a certain degree for locating the disc at the center of a vertical shaft of the cartridge or higher, wherein a central surface of the disc is positioned higher than the center of the vertical shaft of the cartridge.

Description

Disc Driving Apparatus

The present invention relates to a disc drive device, and more particularly to a disc drive device capable of stably driving a disc housed in a cartridge.

In general, discs, especially recordable discs, are becoming more sensitive to contaminants such as dust, fingerprints, and physical damage such as scratches as they become denser. Accordingly, in order to protect the surface of the disk from the pollutant or the like, the disk is generally housed in a cartridge made of a material such as plastic.

The disc cartridge is usually provided with an opening for exposing a part of the information recording surface, which is opened and closed by a shutter fastened correspondingly. The shutter is opened by the shutter opener when the cartridge is inserted into the disc drive so that the disc is rotated with only a part of the disc exposed. As a result, in the cartridge in which the disk is rotated, air flow having an asymmetry about the rotation axis is generated. Due to this asymmetrical air flow, a pressure difference is generated in the cartridge, so that the disk rotated in the cartridge has to steadily swing at a predetermined amplitude. In particular, the rocking phenomenon of the disk is more severe as the disk rotation speed is faster and the thickness of the disk is thinner.

As described above, the disk rocking phenomenon occurring when the disk is rotated in the cartridge causes the information recording and reproducing operation of the disk driving apparatus to become unstable, resulting in a problem of lowering the reliability of the information. In addition, when the disk fluctuations intensify, a fatal problem arises in that the recording surface of the disk collides with the inner surface of the cartridge, causing physical damage such as scratches on the recording surface. Accordingly, there is a demand for a method capable of minimizing the fluctuation of the disk.

Accordingly, an object of the present invention is to provide a disk drive device capable of stably driving a disk in a cartridge to ensure the reliability of information recorded and reproduced.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a characteristic diagram showing the relationship between the position of a vertical disk in a cartridge and the swing amplitude of the disk.

2 is a cross-sectional view showing a conventional magneto-optical disk cartridge.

3 is a graph showing the relationship between the position of the vertical magneto-optical disk and the oscillation amplitude of the magneto-optical disk in the cartridge shown in FIG. 2 according to the disk rotation speed;

4 is a cross-sectional view showing a conventional DVD cartridge.

Fig. 5 is a graph showing the relationship between the vertical DVD position and the swing amplitude of the DVD in the cartridge shown in Fig. 4 in accordance with the disc rotation speed.

6 is a sectional view showing a disk drive device according to the present invention.

<Brief description of symbols for the main parts of the drawings>

10: magneto-optical disk cartridge 10a, 30a: X plane

12: magneto-optical disk 12a, 32a: Y plane

14 Tray 16: Spindle Motor

16a: center core 16b: turntable

18: sled base 20: sled support lever

22: hinge axis 24: deck

30: DVD cartridge 32: DVD

In order to achieve the above object, the disc drive device according to the present invention allows the vertical position of the disc to be set such that when the disc is rotated, the difference in air pressure in the cartridge occurs in the same direction as the direction of the force for clamping the disc. It is characterized by.

In addition, the disc drive device according to the present invention is characterized in that it comprises a disc support means for supporting the disc at a height set by an arbitrary height above the support surface of the cartridge such that the disc is located above the center of the vertical axis in the cartridge.

In addition, the disc drive device according to the present invention is characterized in that it comprises a cartridge support means for supporting the cartridge at a height set lower by an arbitrary height than the support surface of the disc such that the disc is located above the center of the vertical axis of the cartridge.

In addition, the disc drive device according to the invention is characterized in that the disc is rotated in a state located above the center of the vertical axis in the cartridge.

In addition, the disc drive device according to the present invention includes a disc accommodating means for accommodating the disc and a drive means for rotating the disc, and the positional relationship between the accommodating means and the drive means is such that the disc is located above the center of the vertical axis of the accommodating means. Characterized in that set.

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

Before describing the embodiments of the present invention, a background on which the technical spirit of the present invention is derived will be described. The technical idea of the present invention originates from the relationship between the position of the disk with respect to the vertical axis and the oscillation amplitude of the disk in the cartridge which is recognized while considering the magnitude and the tendency of the oscillation amplitude of the disk rotated in the cartridge. The relationship between the position of the disk with respect to the vertical axis in the cartridge and the swing amplitude of the disk is shown in FIG. FIG. 1 shows that the swing amplitude of the disc becomes smaller as the disc position moves from the position below the center of the vertical axis of the cartridge to the position above the center of the vertical axis of the cartridge.

In detail, Fig. 2 shows a longitudinal sectional view of a cartridge in which a conventional magneto-optical disk is accommodated.

In the magneto-optical cartridge shown in FIG. 2, it is assumed that the center plane of the magneto-optical disk 12 is the 'Y plane 12a', and the virtual plane corresponding to the center of the vertical axis inside the cartridge 10 is the 'X plane 10a'. The height of the cartridge 10 is W, the distance from the X plane 10a of the cartridge to the top and bottom surfaces of the cartridge 10 is W1 and W2, and the thickness of the disk 12 is t, The distance from the lower surface to the outer bottom surface of the cartridge 10 is referred to as u. Here, the Y plane 12a of the magneto-optical disk 12 is based on the center plane of the clamping region 12b formed relatively high on the inner circumference. Since the magneto-optical disk 12 typically needs to record with the magnetic head close to the upper surface of the disk, recording is set to a relatively thin thickness (ie 0.6 mm) compared to other optical disks (CD, DVD) in order to position the recording layer thereon. A region 12c and a clamping region 12b set equal to the thickness (ie, 1.2 mm) of another optical disk in consideration of compatibility with other optical disks are provided. As the magneto-optical disk 12 is rotated, as the Y plane 12a of the magneto-optical disk 12 is positioned above the X-plane 10a of the cartridge 10, the fluctuation of the magneto-optical disk 12 becomes more noticeable. On the other hand, as the Y plane 12a of the magneto-optical disc 12 is positioned below the cartridge 10 X plane 10a, the fluctuation of the magneto-optical disc 12 becomes larger gradually.

For example, the height W of the cartridge 10 is 8 mm, the distance W1, W2 from the X plane 10a of the cartridge to the outer surface of the cartridge 10 is 4 mm, and the thickness of the magneto-optical disk 12 is When (t) is 0.6 mm, the swing amplitude of the disk is reduced when the distance u between the lower surface of the magneto-optical disk 12 and the outer bottom surface of the cartridge 10 becomes 3.4 mm or more.

3 is a graph showing the relationship between the position of the magneto-optical disk 12 and the y-plane 12a and the oscillation amplitude with respect to the cartridge 10 X-plane 10a shown in FIG. FIG. 3 shows experimental data demonstrating that the relationship between the position of the magneto-optical disk 12 and the Y plane 12a and the oscillation amplitude with respect to the cartridge 10 X plane 10a is maintained irrespective of the rotational speed.

In FIG. 3, when the Y plane 12a of the magneto-optical disk 12 is positioned above the X plane 10a of the cartridge 10, the Y plane 12a is displayed as a positive offset value and is positioned below. In the case of the same position, it is indicated by a negative offset value, and in the same position, it is indicated by an offset value of '0'. Here, the oscillation amplitude of the magneto-optical disk 12 in the cartridge 10 is determined by the Y plane 12a of the magneto-optical disk 12 being changed to the X-plane of the cartridge 10 even if the rotational speed of the disk 12 varies. It can be seen that the smaller from the lower (-1mm) to the upper (+ 1mm) relative to 10a). In other words, the relationship between the position of the magneto-optical disk 12 and the y-plane 12a with respect to the X-plane 10a of the cartridge 10 and the oscillation amplitude is that the rotational speed of the magneto-optical disk 12 is 1500 rpm and 1800 rpm. The change remains at 2100 rpm, 2400 rpm, or 3000 rpm.

4 and 5, it can be seen that the relationship between the position of the disk and the oscillation amplitude with respect to the vertical axis in the cartridge is maintained even if the thickness t, the thickness W, etc. of the disk change.

FIG. 4 shows a longitudinal cross-sectional view of a cartridge 30 in which a conventional DVD 32 is housed, and FIG. 5 shows a DVD 32 Y plane for the X plane 30a of the cartridge 30 shown in FIG. The relationship between the position of 32a) and the oscillation amplitude is shown graphically as the rotational speed changes.

The DVD 32 shown in FIG. 4 has a thickness different from that of the magneto-optical disc 12 shown in FIG. 2 (that is, 1.2 mm) and is formed flat throughout. The Y plane 32a, which is the center plane in the DVD 32, is assumed to be the center plane with respect to the vertical axis of the DVD 32. Even in such a disc cartridge 30, the swing amplitude of the DVD 32 is equal to the Y plane 32a of the DVD 32, even if the rotational speed of the DVD 32 is changed as shown in FIG. It can be seen that the smaller from the bottom (-0.8mm) to the top (+ 0.8mm) relative to the plane (30a).

Thus, for example, one of the main reasons that the fluctuation of the disk is reduced as the disk in the cartridge is disposed above. In the drive of a disc, the disc in the cartridge is usually seated and fixed to the turntable by the clamper so that the clamping force acts from the top to the bottom of the disc. In this case, when the disk is placed upward, the direction of the force due to the pressure difference generated in the upper and lower sides of the disk due to air flow is added to the clamping force in the same direction to reduce the swing of the disk.

From the relationship between the position of the disk with respect to the vertical axis and the swing amplitude of the disk in the cartridge described above, the technical idea of the present invention has been derived that the swing of the disk can be significantly reduced when the position of the disk is located above the center of the vertical axis of the cartridge.

The technical idea of the present invention can be achieved by a method of increasing the height of the disk support and a method of relatively lowering the height of the cartridge support in the disc drive device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIG. 6.

FIG. 6 is a cross-sectional view of the disc drive device according to the present invention. The disc drive device of FIG. 6 includes a tray 14 supporting the disc cartridge 10 shown in FIG. 2 and a cartridge 10. The spindle 12 is provided with a spindle motor 16 for mounting, fixing and rotating the disk 12 housed therein.

In the disc drive device shown in FIG. 6, the tray 14 is installed in the drive device to enable linear movement in the front-rear direction of the ground, and transfers the cartridge 10 to the drive point or the outside of the drive device by a load or unloading operation. It plays a role. The spindle motor 16 includes a rotor part including a turntable 16b on which the disk 12 in the cartridge 10 is seated, and a stator part configured to generate a driving force by a magnetic circuit part. The turntable 16b is provided with an annular band-shaped rubber felt having a high coefficient of friction on its upper surface to prevent the disk 12 from slipping. The spindle motor 16 also includes a center core 16a integrated with the turntable 16b and inserted into the inner diameter of the disk 12. This center core 16a and turntable 16b are press-fitted to the rotating shaft which is not shown in figure. The spindle motor 16 is pivotally mounted up and down on the deck 24 so as not to interfere with the cartridge 10 mounted on the tray 14 during the loading or unloading operation of the tray 14.

To this end, the disc drive device shown in FIG. 6 supports the spindle motor 14 and the sled base 18 installed to enable the pivoting motion, and the sled support to the hinged area during the pivoting motion of the sled base 18. A lever 20 and a hinge shaft 22 serving as a hinge shaft of the sled support lever 20 are provided. The sled base 18 lifts the spindle motor 16 by pivoting about the hinge shaft 22 in conjunction with a driving force of a rod motor (not shown) during the transfer of the tray 14 on which the cartridge 10 is mounted. Descended.

In such a disk drive device, assuming that the bottom surface of the deck 24 is the reference plane A, the height from the reference plane A to the center of the hinge axis 22 is a, and the bottom surface of the cartridge 10 is the reference plane A. The height b to the height from the reference plane A to the Y plane 12a of the disk 12c, the height from the reference plane A to the top surface inside the cartridge 10 d, the height of the cartridge 10 It is assumed that the distance l between the upper surface inside and the Y plane 12a of the disk 12 is assumed. In addition, an implementation method of the present invention in which the Y plane 12a of the disk 12 is positioned above the X plane 10a of the cartridge 10 will be described in comparison with the related art.

In the first embodiment of the present invention, in the disc drive of FIG. 6, the disc support, i.e., the disc 12, is positioned such that the Y plane 12a of the disc 12 is located above the X plane 10a of the cartridge 10. The seating surface of the turntable 16b to be seated is raised.

In detail, the seating surface of the turntable 16a is raised so that the distance l between the upper surface of the inside of the cartridge 10 and the Y plane 12a of the disk 12 is reduced by Δa as compared with the prior art. One of the methods of raising the mounting surface of the turntable 16b by Δa is to increase the height a from the reference plane A to the center of the hinge axis 22 by Δa. This can be achieved by installing the sled base 18 supporting the spindle motor 16 as high as Δa. Alternatively, by thickly forming the first turntable 16b, the seating surface of the turntable 16b is increased by Δa. Alternatively, the turntable 16b has the same thickness as the conventional one, and the turntable 16b is lengthened by lengthening the rotation axis (not shown) of the spindle motor 16 that is press-fitted to the turntable 16b to support the turntable 16b. Raise the seating surface by Δa. Accordingly, the height d from the reference surface A to the inner upper surface of the cartridge 10 and the Y plane 12a of the disk 12 from the reference surface A in the state where the cartridge 10 is loaded in the related art are conventional. In the present invention, if the difference dc of the height c is equal to 1, the distance between the inner top surface of the cartridge 10 and the Y plane 12a of the disk 12 is set to 1-? A.

As a second embodiment of the present invention, in the disc drive of FIG. 6, a tray in which the cartridge 10 is seated so that the Y plane 12a of the disc 12 is located above the X plane 10a of the cartridge 10 ( The seating surface of 14) is relatively lowered.

In detail, in FIG. 6, the height b from the reference surface A to the lower surface of the cartridge 10 is decreased by Δb. To this end, the seating surface of the tray 14 on which the cartridge 10 is seated is lowered by Δb. Accordingly, the height from the reference surface A to the lower surface of the cartridge 10 becomes b-Δb, and the distance from the inner upper surface of the cartridge 10 to the Y plane 12a of the disk 12 becomes L-Δb. .

As a result, in the disc drive device of the present invention, the height of the support member for supporting the disc 12 or the support member for supporting the cartridge 10 is adjusted so that the Y plane of the disc 12 on the upper surface of the inside of the cartridge 10 ( By reducing the distance l to 12a, the Y plane 12a, which is the center plane of the disk 12, is positioned above the center plane X plane 10a of the cartridge 10. As shown in FIG.

On the other hand, when the disc drive device is an insertion method in which the user directly loads the cartridge into the disc drive device, unlike the tray load method shown in FIG. 6, the support member that supports the cartridge, that is, lowers the height of the chassis, or By raising the height of the turntable, spindle motor, sled base, or the like, the Y plane 12a of the disk 12 can be positioned above the X plane 10a of the cartridge 10.

As described above, when the cartridge is loaded in the disc drive device of the present invention, the Y plane, which is the center plane of the disc, is positioned above the X plane, which is the center plane of the cartridge, thereby reducing the fluctuations during rotation of the disc.

On the other hand, the present invention has been described only for a cartridge that can be attached and detached to the disk drive device, it is obvious that the technical idea of the present invention can be applied even when the storage device is accommodated in the drive device. In other words, when the disc holding device is fixed to the driving device, the positional relationship between the disc holding device and the driving means, that is, the spindle motor is set so that the disc is located above the center of the vertical axis of the disc holding device as described above. The same effect can be obtained.

As described above, according to the disc drive device according to the present invention, by arranging the support member for supporting the cartridge or the disc such that the disc in the cartridge is located above the center of the vertical axis of the cartridge, the swing of the disc during rotation can be minimized. Furthermore, according to the disk drive apparatus according to the present invention, the fluctuation of the disk can be minimized and rotated stably to ensure the reliability of information recorded and reproduced.

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.

Claims (14)

A drive device for driving a disc housed in a cartridge, the disc supporting means for supporting the disc at a height set to a height higher than a support surface of the cartridge such that the disc in the cartridge is located above a center of a vertical axis in the cartridge. Disc drive device comprising a. 2. The disk drive apparatus according to claim 1, wherein the center plane of the disk is located above the center of the vertical axis of the cartridge. The disk drive apparatus according to claim 1, wherein a lower surface of the disk is located at or above a center of a vertical axis of the cartridge. The disk drive apparatus according to claim 1, wherein an upper surface corresponding to the recording area of the disk is located at or above the center of the vertical axis of the cartridge. 5. The disk drive device according to claim 4, wherein the total thickness of the cartridge is about 8 mm and the distance from the bottom of the outside of the cartridge to the bottom surface of the disc is at least 3.4 mm. The disk drive apparatus according to claim 1, wherein the support means is a turntable of a spindle motor on which the disk is seated. 7. The disk drive apparatus according to claim 6, wherein the height of the base supporting the spindle motor is increased by an arbitrary height so as to increase the height of the turntable. 7. The disk drive apparatus according to claim 6, wherein the height of the rotating shaft of the spindle motor is increased by an arbitrary height to increase the height of the turntable. A device for driving a disc housed in a cartridge, the apparatus comprising: a cartridge support means for supporting the cartridge at a height set to a height lower than a support surface of the disc such that the disc in the cartridge is located above the center of the vertical axis of the cartridge; Disc drive device characterized in that it comprises. 10. The disk drive apparatus according to claim 9, wherein the center plane of the disk is located above the center of the vertical axis of the cartridge. 10. The disk drive apparatus according to claim 9, wherein a lower surface of the disk is located above a center of a vertical axis of the cartridge. 10. The disk drive apparatus according to claim 9, wherein an upper surface of the recording area of the disk is located at or above the center of the vertical axis of the cartridge. 13. The disk drive device according to claim 12, wherein the total thickness of the cartridge is about 8 mm and the distance from the bottom of the outside of the cartridge to the bottom surface of the disc is at least 3.4 mm. 10. The disk drive apparatus according to claim 9, wherein the support means is a tray for transporting the mounted cartridge.