KR20000038344A - Disc driving device - Google Patents

Abstract

PURPOSE: A disc driving device is provided to record or play an information in a recording medium and to minimize a noise inside the disc driving device. CONSTITUTION: A disc driving device is equipped a tray(100), a sound absorbing member(40), a clamper(4), a holder of clamper(2) and a mechanism base(20). The tray(10) is formed a storing face of disc(11) formed a sill between a front end(11) and a rear end(12). A window(2) is formed between the rear end(12) and the storing face of disc(11). The sound absorbing member(40) is faced to a rear cut face of the window(2) generated many changes of current by sticking in a recessed face(14) formed between a sill portion(12a) on the rear end(12) of the tray(10). The sound absorbing member(40) reduces a noise by absorbing an air flowed in to reduce a ventilation and a diffusion of an airflow. A porous material such as a sponge is used to a material of the sound absorbing member(40). The sponge is economic because it is cheaper than other material and reduces the diffusion of airflow excellently.

Description

Disc Driving Apparatus

The present invention relates to a disc drive device for recording or reproducing information on a recording medium, and more particularly, to a disc drive device for reducing noise.

Discs such as DVDs, which have a higher recording density than CDs, have already been generalized. In addition, the disk has been developed in a large capacity and high density trend up to the MOD (Magneto-Optical Disk) which records information by magnetic field modulation recording method, irradiates light to the recording surface and reproduces the information. . Today, disks and hard disks can accommodate large amounts of data, ranging from gigabytes to tens of gigabytes.

Along with this, a disk drive device has been speeded up to enable high-speed data transfer, and a 40-speed product has been developed in the case of a CD-ROM drive device. However, the high speed of the disc drive device exposes a number of problems, and the higher the speed, the more serious the noise problem appears.

1 and 2, the CD-ROM drive includes a tray 10 for storing the disc 1 from the outside and transferring the disc 1 to a turntable of a spindle motor (not shown) installed inside the disc drive device. A clamper 4 for fixing (1) to the turntable, a mechanism base 20 on which the tray 10 is installed to be linearly movable, and a top case 30 for shielding the mechanism base 20 is provided. . The tray 10 is formed between the front end portion 11 and the rear end portion 12 and the stepped disc receiving surface 11. An access space is provided between the rear end portion 12 and the disk receiving surface 11 so that an optical pickup (not shown) can irradiate the disk 1 with light, and the clamper 4 is used to connect the turntable of the spindle motor. A window 2 for forming a clamping space for tightly fixing and fixing the disk 1 is formed.

The mechanism base 20 is provided with a tray 10, an optical pickup for irradiating light to the disk 1, and a spindle motor for rotating the disk. In addition, the mechanism base 20 is provided with a drive system for transporting the tray 10 and lifting the optical pickup and the spindle motor toward the disk. The top case 30 serves to shield the mechanism base 20 to protect the entire disk drive from external shock or contamination.

In the reproducing mode or the recording mode, when the disk 1 rotates, air flow is generated by the rotation of the disk 1 inside the mechanism base 20 shielded by the top case 30.

Figure 3 shows the stream of air flow generated inside the CD-ROM 32 double speed drive system. In Fig. 3, the difference in contrast indicates the magnitude of the flow velocity of the air flow and the level of the flow velocity is the same as the bar index on the right. The arrow representing the streamline indicates the direction of air flow and the length of the arrow also shows the magnitude of the flow velocity. As can be seen in FIG. 3, it can be seen that the flow velocity around the disk 1 is the fastest in the entire disk drive and the magnitude of the flow velocity decreases as the distance from the disk 1 increases. This asymmetrical flow rate of air flow increases the asymmetry of the air flow in the disc drive device in the area of the window 2, which is an access space for the optical pickup to irradiate light onto the disc 1. The presence of this window 2 acts as one of the major noise sources. In detail, the air generated from the upper surface side of the tray 2 when the disk rotates is discharged through the window 2, and noise is generated when the air is discharged from the narrow space to the large space. That is, the flow rate decreases while the air having a high flow rate spreads to a wide space, and some of the kinetic energy of the air is converted into heat and sound energy, thereby generating noise at the window 2 portion.

In particular, since the disc drive device has a wider rear side at the rear end 12 side than the front side at the front end 11 side with respect to the window 2, air generated while the disc 1 rotates is discharged to the rear side. And since it becomes easy to diffuse, it becomes the structure which a noise is easy to produce.

Accordingly, it is an object of the present invention to provide a tray having a sound absorption function for minimizing noise in a disc drive device.

1 is a perspective view schematically showing the appearance of a CD-ROM drive;

2 is a perspective view showing the configuration of the CD-ROM drive shown in FIG.

3 is a view showing a streamline of air flow generated inside the CD-ROM drive unit shown in FIG.

4 is a perspective view showing a disk drive according to an embodiment of the present invention.

5 is a view showing an air flow rate distribution inside the CD-ROM drive unit shown in FIG.

<Description of the code | symbol about the principal part of drawing>

1: disk 2: Windows

4: clamper 6: clamper holder

10 tray 11 shear portion

12: rear end 12a: step

12b: concave surface 13: disk storage surface

20: mechanism base 30: top case

40: sound absorption member

In order to achieve the above object, the disc drive device according to the present invention includes a tray for opening the disc to convey the disc, and a sound absorbing member for absorbing noise by being attached to the area around the opening.

Other objects and features 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, exemplary embodiments of the present invention will be described with reference to FIGS. 4 and 5.

4 is a perspective view showing a disc drive device according to an embodiment of the present invention.

In the configuration of FIG. 4, the disc drive device of the present invention includes a tray 10 for receiving the disc 1 from the outside and transferring the disc 1 to the turntable of the spindle motor installed inside the disc drive device, and the window 2 of the tray 10. ) A sound absorbing member 40 for absorbing and removing noise generated by air discharged and diffused to the rear side, a clamper 4 for fixing the disk 1 to the turntable, and a clamper 4 ) And a mechanism base (20) for supporting the clamper holder (6) and a tray (10) for linear movement. The tray 10 is formed between the front end portion 11 and the rear end portion 12 and the stepped disc receiving surface 11. A window 2 is formed between the rear end 12 and the disk receiving surface 11.

The sound absorbing member 40 is bonded to the concave surface 14 formed between the stepped portions 12a on the rear end portion 12 of the tray 10 so as to face the rear notched surface of the window 2. The sound absorbing member 40 is located at the rear side of the window 2 in which the air flow rate changes a lot and absorbs the air flowing into it, thereby reducing noise by reducing the discharge and diffusion of the air flow. As the material of the sound absorbing member 40, a porous material such as a sponge is used. In particular, since the sponge is cheaper than other materials used for sound absorption, it is not only economical but also excellent in reducing the diffusion effect of the air flow.

Figure 5 shows the distribution of air flow rate in the cross section and plane of the disk drive when the disk rotates. In Fig. 5, (A) shows the air velocity distribution observed at a point of 0.1 mm from the lower surface of the disk, and (B) is a longitudinal section of the disk drive cut along the line "A-A '" in (A). Air velocity distribution is shown.

As can be seen from Figs. 5A and 5B, it can be seen that the discharge and diffusion of air at the site of the window 2 is much larger than in other parts of the disc drive device. In this way, the sound absorbing member 40 is provided in the area where the air is largely discharged and diffused, that is, the rear side of the window 2, so that aerodynamic noise generated when the disk rotates at high speed can be reduced.

As described above, the disk drive device of the present invention can effectively reduce the noise generated in the disk drive device by attaching the sound absorbing member in a region where air discharge and diffusion are large, that is, a region where the air flow rate changes frequently. . Furthermore, the disk drive apparatus according to the present invention can effectively reduce the noise by using the minimum cost and the member by attaching the sound absorbing member made of inexpensive material only in the region where the air is largely discharged and diffused.

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 (5)

An opening is formed in the tray for conveying the disk, And a sound absorbing member attached to a region around the opening to absorb noise. The method of claim 1, The sound absorbing member is mounted on the rear side of the opening. The method of claim 1, The opening is formed between the disk receiving surface and the rear end formed in the tray, And the sound absorbing member is mounted on a concave surface formed between the stepped portions at the rear end portion. The method of claim 1, And the sound absorbing member is a porous material. The method of claim 1, The sound absorbing member is a disk drive, characterized in that the sponge.