KR100230257B1 - Damping device for optic disk driver - Google Patents

Abstract

A damping device for an optical disc drive is disclosed.

The damping apparatus for an optical disc drive according to the present invention is provided over a frame and a base of an optical disc drive and acts to mitigate vibration from the inside and outside of the drive. In the damping apparatus for an optical disc drive, Wherein the X-axis direction vibration absorbing portion and the Y-axis direction vibration absorbing portion are formed in an L-shaped integral structure, and the Z-axis direction vibration absorbing portion and the Y- The X-axis vibration absorber and the Z-axis vibration absorber are connected to each other by a connecting member. The height of the X-axis vibration absorber and the Y-axis vibration absorber is Z Is formed to be relatively higher than the height of the axial vibration absorbing portion.

According to the damping apparatus of the present invention, unlike the prior art, since the vibration absorbing portions capable of absorbing vibrations in three directions of the X axis, the Y axis, and the Z axis are provided, It can be absorbed smoothly, and can be fully layered.

Description

Damping device for optical disc drive

FIG. 1 is a plan view schematically showing a configuration of a general optical disc drive. FIG.

Figure 2 is a side cross-sectional view of the optical disc drive of Figure 1;

FIG. 3 is an enlarged cross-sectional view of a conventional damper employed in the optical disc drive of FIG. 1;

FIG. 4 is a perspective view showing a structure of a damping apparatus for an optical disc drive according to the present invention; FIG.

FIG. 5 is a partial exploded perspective view showing a state in which the damping device of FIG. 4 is installed in the optical disc drive; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

11: Frame 12: Base

13: Tentative 14: Damper

14a, 14b: vertical vibration absorbing space 14c: horizontal vibration absorbing space

14t, 14t ': (for coupling) projection 15: optical pickup unit

16: spindle motor 20: (eccentric) disk

40: Damping device (of the present invention) 41: X-axis vibration absorber

42: Y-axis direction vibration absorption part 43: Z-axis direction vibration absorption part

44: connecting member 42s, 43s: air space

43t, 43t ': Fixing projection

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc drive such as a CD-ROM drive, and more particularly, to an optical disc drive, such as a CD-ROM drive, To a damping device for an optical disc drive.

2. Description of the Related Art In general, an optical disk drive using an optical recording medium such as an LDP (Laser Disk Player) and a CDP (Compact Disk Player) includes an optical system for projecting a laser to a predetermined position of an optical disk and picking up the reflected light, And a signal operation system for processing the picked-up signal.

However, since such an optical disc rotates about 200 to 500 times per minute, the optical disk is very fast compared to a player of a conventional LP plate that rotates 33/1 per minute. Therefore, a large turn table such as an LP plate is not used, The spindle motor is directly mounted on a small turntable capable of clamping only a portion that does not include the signal of the spindle. Therefore, such an optical disc drive has inherent problems that it is susceptible to vibration and shock transmitted from the outside.

On the other hand, since the distance between tracks on which information is recorded is about 1.6 mu m, it is difficult to expect that the center axis of the motor and the center of rotation of these tracks exactly coincide with each other. This is usually due to the degree of machining of the center hole of the disk and the error in mounting the disk on the spindle motor drive shaft. This also causes a track error due to the roundness error of the track itself. These error components are combined with the vibration transmitted from the inside or the outside of the optical disc recording / reproducing apparatus, resulting in problems such as data reading error, skipping, and data installation incapability. Therefore, in the optical disk recording / reproducing apparatus, a tracking servo and a focusing servo, etc., which allow the optical beam to always follow one track and keep accurate focus even if a disturbance such as eccentricity or vibration occurs, Respectively.

However, since the tracking servo and the focusing servo must control the error that oscillates at a high frequency such as the eccentricity of the disk to the extent of +/- 1.0 mu m or less, the initial vibration condition is minimized as much as possible in consideration of the limit of control, It is necessary to install a device that absorbs the impact of the vehicle. Accordingly, conventionally, a damping device for absorbing external vibration is provided between the frame of the optical disc drive and the base on which the turntable is seated.

FIGS. 1 and 2 schematically show a general optical disc drive, wherein FIG. 1 is a plan view and FIG. 2 is a side sectional view.

Referring to FIGS. 1 and 2, the optical disc drive includes a frame 11 constituting a main body, a base 12 disposed on the upper portion of the frame 11 and having a turntable 13 rotatably installed therein, And a damper (14) coupled between the frame (11) and the base (12) by a predetermined coupling means to absorb the vibration transmitted to the turntable (13). As shown in FIG. 3, in the damper 14, vertical vibration absorbing spaces 14a and 14b for absorbing vertical vibration and horizontal vibration absorbing spaces (for absorbing horizontal vibration) 14c. In addition, protrusions 14t and 14t 'for coupling with the base 12 are formed on the bottom surface and one side surface of the body of the damper 14, respectively.

In FIGS. 1 and 2, reference numeral 15 denotes an optical pickup unit, and 16 denotes a spindle motor.

In the optical disc drive employing the conventional damper 14 having the above-described structure, when the vibration due to the high-speed rotation of the eccentric disc 20 is generated, the vibration is transmitted to the entire drive through the base 12 . At this time, the vibration is once buffered by the damper 14. That is, the vertical component of the vibration is absorbed by the damper 14 by the vertical vibration absorbing spaces 14a and 14b inside the damper 14 and the horizontal component of vibration is absorbed by the horizontal vibration absorbing And are absorbed and buffered by the space 14c, respectively.

However, the conventional damper 14 as described above can cope with vibrations in the vertical direction (Z-axis direction) and the horizontal direction (X-axis direction) It is pointed out that it is impossible to cope with the vibration in the forward and backward directions in the drawing. Here, when external vibration is added, the degree of the vibration is further increased, and access by the optical pickup may become impossible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and provides a damping device for an optical disk drive capable of mitigating vibrations due to rotation of an eccentric disk and vibrations from the outside in three axial directions of X, It has its purpose.

In order to achieve the above object, a damping apparatus for an optical disc drive according to the present invention is provided on a frame and a base of an optical disc drive to mitigate vibration from the inside and the outside of the drive, The damping device is provided with an X-axis direction vibration absorbing portion, a Y-axis direction vibration absorbing portion and a Z-axis direction vibration absorbing portion for relieving vibration in the X-axis, Y- Axis direction vibration absorbing portion and the Y-axis direction vibration absorbing portion are formed in an L-shaped integral structure, and the Z-axis direction vibration absorbing portion is composed of an eight- Axis vibration absorbers are connected to each other by a connecting member, and the heights of the X-axis vibration absorbers and the Y-axis vibration absorbers from the bottom surface are higher than the height of the Z- And is formed to be relatively higher by a predetermined height.

According to the damping apparatus of the present invention, unlike the prior art, since the vibration absorbing portions capable of absorbing vibrations in three directions of the X axis, the Y axis, and the Z axis are provided, It has the advantage of absorbing and buffering smoothly.

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

FIGS. 4 and 5 show a damping apparatus for an optical disc drive according to the present invention, wherein FIG. 4 is a perspective view showing the overall structure and FIG. 5 is a partial exploded perspective view in a state where the damping apparatus is installed in the optical disc drive.

Referring to FIGS. 4 and 5, the damping device 40 for an optical disc drive of the present invention includes an X-axis vibration absorber (not shown) for alleviating vibrations in X-, Y- and Z- 41, a Y-axis direction vibration absorbing portion 42, and a Z-axis direction vibration absorbing portion 43, respectively.

The X-axis direction vibration absorbing portion 41 and the Y-axis direction vibration absorbing portion 42 are formed as an L-shaped one-piece structure as shown in the figure, and vibrations in the X- and Y- An air space 42s is provided for absorbing and alleviating the foreign matter. The air spaces 42s may be connected to each other within the L-shaped body to form a space. The air spaces 42s may be formed in the X-axis vibration absorber 41 and the Y-axis vibration absorber 42, respectively And they may be formed as independent spaces. The height H of the X-axis and Y-axis vibration absorbers 41 and 42 from the bottom surface is relatively larger than the height h of the Z-axis vibration absorber 43 by a predetermined height . 5, the end portions of the base 12 in the X-axis and Y-axis directions correspond to the effective regions of the air spaces 42s in the X-axis and Y-axis vibration absorbing portions 41 and 42, So as to be able to cope with the vibrations of the base 12 in the X-axis and Y-axis directions.

On the other hand, the Z-axis direction vibration absorbing part 43 is formed as an eight-character integral structure, and an air space 43s for absorbing and absorbing vibration in the Z-axis direction is provided inside the body. Fixing protrusions 43t and 43t 'for fixing and fixing the base 12 of the optical disc drive to the frame 11 are formed on the upper and lower surfaces of the body, respectively. Therefore, through holes for fastening the protrusions 43t and 43t 'are provided on predetermined portions of the base 12 and the frame 11 of the optical disc drive, respectively. The Z-axis vibration absorber 43 is connected to the X-axis vibration absorber 41 by the connecting member 44, so that the damping device 40 of the present invention is integrally formed into a single body . Such a damping device 40 is made of a material having excellent shock absorbing characteristics, for example, natural rubber, polyurethane, synthetic resin, or the like.

When the damping device 40 of the present invention as described above is installed in the optical disc drive, the L-shaped X-axis and Y-axis vibration absorbers 41 and 42 are arranged at the corners of the frame 11 And is brought into close contact. In such a state, the fixing protrusion 43t 'formed on the bottom surface of the body of the Z-axis direction vibration absorbing part 43 is fastened to a through hole (not shown) formed on the bottom surface of the frame 11 The damping device 40 is fixed to the frame 11 once. By inserting through holes (not shown) formed in the base 12 into the fixing protrusions 43t formed on the upper surface of the body of the Z-axis direction vibration absorbing portion 43 in this state, the base 12 . Although the damping device 40 is provided at one corner of the frame 11 in the present embodiment, the damping device 40 may be provided at four corners of the frame 11, Respectively.

As described above, when the eccentric disc is mounted on the optical disc drive in which the damping unit 40 is installed, for example, the eccentric disc may eventually cause the eccentricity of the center of gravity of the disc to generate vibration corresponding to the degree of eccentricity, . At this time, the vibration is transmitted to the base 12 via the spindle motor 16 (second support), and is transmitted to the damping device 40 which is in contact with the base 12 again. Thus, the vibration is transmitted to the damping device 40, and the component of the vibration in the X-axis direction is absorbed and relaxed by the vibration absorbing portion 41 in the X-axis direction of the damping device 40. The components in the Y-axis and Z-axis directions of vibration are similarly absorbed by the Y-axis vibration absorber 42 and the Z-axis vibration absorber 43 of the damping device 40, respectively, to be relaxed.

When vibration from the outside is transmitted to the drive when the drive is driven, the vibration absorbing parts 41, 42 and 43 in the X, Y and Z axial directions of the damping device 40 absorb So that external vibration is not transmitted to the inside of the drive.

As described above, according to the damping apparatus of the present invention, since the vibration absorbing portions capable of absorbing the vibrations in the three directions of the X axis, Y axis and Z axis are provided, respectively, It is possible to smoothly absorb and vibrate the vibration of the vehicle.

Claims (1)

A damping device for an optical disc drive, which is installed across a frame and a base of an optical disc drive and mitigates vibrations from the inside and outside of the drive, characterized in that the damping device is provided with a damping device in the X-, Y- and Z- Axis vibration absorber, a Y-axis vibration absorber, and a Z-axis vibration absorber, the X-axis vibration absorber and the Y-axis vibration absorber having an L-shaped integral structure Axis vibration absorber is connected to the X-axis vibration absorber and the Y-axis vibration absorber, and the Z-axis vibration absorber is composed of an eight- And the height from the bottom surface of the axial vibration absorber is relatively higher than the height of the Z-axial vibration absorber by a predetermined height. Damping device for drive.