KR100468757B1 - Disc clamping apparatus and optical disc drive having the same - Google Patents

Abstract

Disc clamping device for clamping the disk mounted on the boss of a predetermined height inserted into the mounting hole in the center of the disk and seated on the turntable, and an optical disk drive having the same. Disc clamping device disclosed is a clamper, one end of which is hinged to the boss and the other end is rotated by the centrifugal force generated by the rotation of the turntable to extend outwardly of the boss to clamp the disk, and the other end of the clamper And a first spring coupled to elastically bias the other end of the clamper to enter the outer circumference of the boss. According to this configuration, it is possible to more firmly clamp the disk seated on the turntable by using the centrifugal force by the rotation of the turntable, it is possible to prevent the disk from being separated by an external impact.

Description

Disc clamping apparatus and optical disc drive having the same

The present invention relates to an optical disk drive, and more particularly, to a disk clamping device for clamping a disk seated on a turntable rotated by a spindle motor and an optical disk drive having the same.

In general, an optical disc drive is a device for recording data or reproducing recorded data by irradiating light onto a recording medium such as a compact disc (CD) or a digital video disc (DVD). A spindle motor for rotating the turntable, and an optical pickup for irradiating light to the recording surface of the disk to record and reproduce data.

1 shows a pickup deck of an optical disk drive employing a conventional disk clamping device.

Referring to FIG. 1, an optical disk drive includes a spindle motor 20 for rotating a disk D and an optical pickup 30 for irradiating light onto a recording surface of the disk D to record and reproduce data. do. The spindle motor 20 and the optical pickup 30 are assembled to the pickup deck 10 of the optical disk drive, and the hollow 12 is formed in the pickup deck 10 so that the optical pickup 30 can move. have.

The optical pickup 30 moves in the radial direction of the disk D and irradiates light onto the recording surface of the disk D. To this end, the pickup deck 10 is provided with an optical pickup transfer device 40. The optical pickup transfer device 40 transmits the power of the lead screw 46, the drive motor 42, and the drive motor 42 to the lead screw 46 to linearly move the optical pickup 30 by the rotation thereof. It is composed of a connecting gear group 44. In addition, two guide shafts 51 and 52 are provided at both sides of the optical pickup 30 to guide the reciprocating linear movement of the optical pickup 30 by the optical pickup transfer device 40.

In the optical disk drive having such a configuration, as described above, the turntable 60 on which the disk D is mounted is provided on the upper portion of the spindle motor 20. In particular, in a slim optical disk drive employed in a portable computer such as a notebook computer, the height thereof needs to be reduced, so that the upper surface of the spindle motor 20 serves as a turntable 60 directly as shown.

The turntable 60 is provided with a boss 62 having a predetermined height inserted into the mounting hole in the center of the disk D around the rotating shaft 22 of the spindle motor 20. The boss 62 has a turntable 60. There is provided a clamping device for clamping the disk D seated on the head). The conventional disk clamping device is composed of three protrusions 64 coupled to the outer circumference of the boss 62 and three springs 66 which elastically bias each of the three protrusions 64 outward.

On the other hand, reference numeral 68 denotes a pad which prevents the disk D from sliding during the rotation of the turntable 60.

2A and 2B are partial cross-sectional views illustrating a process of seating a disk on a turntable provided with the conventional disk clamping device illustrated in FIG. 1.

Referring first to FIG. 2A, in a state where the disk D is not seated on the turntable 60, the protrusion 64 protrudes outward from the outer circumferential surface of the boss 62 by the elastic force of the spring 66. When the disc D is pressed by a human hand to seat the disc D on the turntable 60, the protrusion 64 is inside the boss 62 because the inner circumference of the disc D interferes with the protrusion 64. Will be pushed in. Subsequently, as shown in FIG. 2B, when the disk D is fully seated on the turntable 60, that is, when the disk D is in close contact with the pad 68, the projection 64 is applied to the elastic force of the spring 66. It presses against the inner periphery of the disk D by this. Thus, the disk D is clamped by the spring 66 and the projection 64 while seated on the turntable 60 to rotate with the turntable 60.

By the way, in the conventional disk clamping device having the above-described configuration, the spring 66 has a relatively weak elastic force so that the disk (D) can be easily attached and detached by a human hand. Therefore, the clamping force of the disk D may not be sufficient, and if an external impact is applied to the disk drive, a problem arises in that the disk D is easily detached from the protrusion 64 of the disk clamping device. May cause an error during operation. In particular, since the slim optical disk drive is adopted in a portable computer, it is susceptible to shock from the outside, and also means for bringing the disk D into close contact with the turntable 60 at the top of the disk D to clamp the disk D. Since it is difficult to provide the separation phenomenon of the disk (D) is more easily generated.

Further, in the recent trend in which the disk drive is gradually increasing in speed for fast data access and recording, when the clamping force of the disk D becomes weak, the vibration of the disk D during high-speed rotation of the disk D is reduced. Since it increases the performance of the disk drive, it is difficult to increase the speed of the disk drive as a conventional disk clamping device.

The present invention was created in order to solve the problems of the prior art as described above, in particular, it is possible to more firmly clamp the disk seated on the turntable by using the centrifugal force by the rotation of the turntable and to prevent the disk from being separated by an external impact. Disclosure of the Invention It is an object of the present invention to provide a disk clamping device having a structure that can be used and an optical disk drive having the same.

1 is a perspective view showing a pickup deck of an optical disk drive employing a conventional disk clamping device.

2A and 2B are partial cross-sectional views illustrating a process of seating a disk on a turntable provided with the conventional disk clamping device illustrated in FIG. 1.

3 is a plan view illustrating a disk clamping apparatus of the optical disk drive according to the first embodiment of the present invention.

4 is a partially enlarged perspective view of the disk clamping device shown in FIG. 3.

5A and 5B are partial cross-sectional views illustrating a process of clamping a disk in the disk clamping device shown in FIG. 3.

6 is a perspective view illustrating a disk clamping device of an optical disk drive according to a second embodiment of the present invention.

7 is a perspective view illustrating a disk clamping device of an optical disk drive according to a third embodiment of the present invention.

FIG. 8 is a partial cross-sectional view illustrating a state in which a disk is clamped to the disk clamping device shown in FIG. 7.

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

110 ... spindle motor 112 ... spindle

120 ... turntable 122 ... pad

130,230,330 ... Boss 132,232,332 ... Installation groove

140,240,340 ... Clamper 150,250,350 ... First spring

160 ... protrusion 170 ... second spring

342 ... Cover part 344 ... Pressure part

The present invention to achieve the above object,

In the disk clamping device of the optical disk drive installed in the boss of a predetermined height inserted into the mounting hole in the center of the disk clamping the disk seated on the turntable,

A clamper, one end of which is hinged to the boss, the other end of which is rotated by a centrifugal force generated by the rotation of the turntable to extend outward of the boss to clamp the disc; And

And a first spring coupled to the other end of the clamper to elastically bias the other end of the clamper to enter the outer circumference of the boss.

According to the first embodiment of the present invention, the other end of the clamper may be configured to cover the upper surface of the disk when the turntable is rotated. In this case, the clamper and the first spring may be installed at least one.

According to the second embodiment of the present invention, the other end of the clamper may be configured to be in close contact with the inner circumference of the disk when the turntable is rotated.

According to the third embodiment of the present invention, the other end portion of the clamper includes a cover portion which covers the upper surface of the disk when the turntable rotates, and pressurized to be in close contact with the inner circumference of the disk when the turntable rotates. An additional may be provided.

In the second and third embodiments, it is preferable that at least three clampers and the first springs are installed at equal intervals along the outer circumference of the boss.

In addition, the disk clamping device according to the present invention is a projection installed on the outer periphery of the boss to move a predetermined distance in the radial direction of the boss, and is installed in the boss to be seated on the turntable by elastically biasing the projection to the outside A second spring may be further provided on the inner circumference of the disk to close the protrusion. In this case, it is preferable that at least three projections and the second springs are installed at equal intervals along the outer circumference of the boss.

Preferably, the clamper and the first spring are installed in an installation groove formed at a predetermined depth on the boss.

The disk clamping device according to the present invention described above is preferably applied to a slim optical disk drive used in a portable computer.

In addition, the present invention provides an optical disk drive including the disk clamping device.

According to this configuration, it is possible to more firmly clamp the disk seated on the turntable by using the centrifugal force by the rotation of the turntable, it is possible to prevent the disk from being separated by an external impact.

Hereinafter, with reference to the accompanying drawings will be described in detail preferred embodiments of the disk clamping device and an optical disk drive having the same according to the present invention. Like reference numerals in the following drawings indicate like elements.

FIG. 3 is a plan view showing a disk clamping device of the optical disk drive according to the first embodiment of the present invention, and FIG. 4 is a partially enlarged perspective view of the disk clamping device shown in FIG.

3 and 4 together, the disk clamping device according to the present invention is for clamping the disk (D) seated on the turntable 120, it is installed on the boss 130 of a predetermined height installed on the turntable 120 do. The turntable 120 on which the disk D is seated is provided at the top of the spindle motor 110. In particular, in a slim optical disk drive employed in a portable computer such as a notebook computer, the height thereof needs to be reduced, so that the upper surface of the spindle motor 110 serves as a turntable 120 directly as shown. A pad 122 is attached to the upper surface of the outer circumferential side of the turntable 120 to prevent the disk D from sliding during the rotation of the turntable 120. On the other hand, although not shown, the turntable 120 may be installed in close contact with the upper surface of the spindle motor 110 as a disc-shaped member separate from the spindle motor 110. The boss 130 is installed around the rotating shaft 112 of the spindle motor 110, and is inserted into the mounting hole H in the center of the disk D when the disk D is seated on the turntable 120.

The disk clamping device according to the present invention installed in the boss 130 includes a clamper 140 covering the upper surface of the disk D, and a first spring 150 connected to the clamper 140. .

One end of the clamper 140 is hinged to a hinge pin 141 installed at the boss 130, and the other end thereof is installed to rotate at a predetermined angle about the hinge pin 141. The first spring 150 is coupled to the other end of the clamper 140 to elastically bias the other end of the clamper 140 to enter the outer circumference of the boss 130. Any kind of spring may be used as the first spring 150 as long as it can perform the above function, but it is preferable to use a tension coil spring in consideration of the simplicity of structure and convenience of installation. Therefore, when the turntable 120 does not rotate, the clamper 140 is pulled into the outer circumference of the boss 130 by the elastic force of the first spring 150 so as not to protrude outward of the outer circumference of the boss 130. .

On the other hand, when the turntable 120 rotates, centrifugal force is generated, and by the centrifugal force, the other end of the clamper 140 overcomes the elastic force of the first spring 150 and rotates a predetermined angle to rotate the outer periphery of the boss 130. It extends outward to cover the top surface of the disk D seated on the turntable 120. On the other hand, the centrifugal force F that is applied to the clamper 140 is represented by the formula of mrω ^2. In this equation, m is the mass of the clamper 140, r is the radius of rotation, ie the distance from the center of rotation to the clamper 140, ω is the rotation of the clamper 140 to rotate with the turntable 120 and the boss 130 Indicates angular velocity. Therefore, the centrifugal force F acting on the clamper 140 is proportional to the mass m and the radius of rotation r and proportional to the square of the rotational angular velocity ω. Here, the clamper 140 is installed as close to the outer circumference of the boss 130 as possible to increase the rotation radius r. However, since the outer diameter of the boss 130 is determined, it is limited to increase the rotation radius r. Since the rotational angular velocity ω is determined by the speed of the disk drive, it cannot be arbitrarily increased. As a result, in order to increase the centrifugal force F, it is most preferable to increase the mass of the clamper 140. Therefore, in the present invention, it is preferable that the clamper 140 is made of a metal material having a high density.

In addition, the clamper 140 and the first spring 150 may be installed on the upper surface of the boss 130, but in general, considering the height of the boss 130 is higher than the height of the disk (D) boss ( It is installed in the installation groove 132 formed to a predetermined depth on the upper surface of 130. This is to allow the bottom surface of the clamper 140 to slide while being in contact with the top surface of the disk D. In addition, when the clamper 140 is installed on the upper surface of the boss 130, the overall height of the disk drive is increased, but as described above, the clamper 140 is disposed on the bottom surface of the installation groove 132 having a predetermined depth. In this case, the overall height of the disk drive does not increase.

On the other hand, the clamper 140 and the first spring 150 may be installed only one in its function, it may be installed two by 180 ° intervals. However, as shown, it is preferable that three are installed at equal intervals along the outer circumference of the boss 130. This can prevent the disadvantage that the center of gravity of the boss 130 is rotated to one side during the rotation of the turntable 120, the vibration is generated, when the clamper 140 covers the upper surface of the disk (D) only in one place from the outside This is because the possibility that the disk D is tilted when an impact is applied can also be excluded.

The disk clamping device further includes a protrusion 160 installed at an outer circumference of the boss 130 and a second spring 170 installed inside the boss 130.

The protrusion 160 is installed to move a predetermined distance in the radial direction of the boss 130 in the protrusion coupling groove 134 formed on the outer circumference of the boss 130. The second spring 170 is installed inside the boss 130 to elastically bias the protrusion 160 to the outside. Therefore, since the protrusion 160 protrudes out of the outer circumference of the boss 130 by the elastic force of the second spring 170, when the disk D is seated on the turntable 120, the protrusion 160 is in close contact with the inner circumference of the disk D. Various types of springs may also be used for the second spring 170, but it is preferable to use a compression coil spring for the reasons described above.

At least three protrusions 160 and two springs 170 are installed along the outer circumference of the boss 130 at equal intervals. In addition, when the protrusions 160 and three clampers 140 are each installed, it is preferable that the protrusions 160 and the clampers 140 are alternately arranged along the outer circumference of the boss 130 as shown. As a result, the force for clamping the disk D can be balanced, and vibration of the disk D can be reduced.

5A and 5B illustrate a process in which a disk is clamped to the disk clamping apparatus shown in FIG. 3.

First, referring to FIG. 5A, when the disk D is not seated on the turntable 120, the protrusion 160 protrudes outward from the outer circumferential surface of the boss 130 by the elastic force of the second spring 170. . When the disk D is pressed by a human hand to seat the disk D on the turntable 120, the protrusion 160 is inside the boss 130 because the inner circumference of the disk D interferes with the protrusion 160. Will be pushed in. At this time, since the clamper 140 is pulled into the outer circumference of the boss 130 by the elastic force of the first spring 150, the clamper 140 does not interfere with the inner circumference of the disk D. Therefore, the disk D is connected to the disk clamping device. Easy to install

For example, as shown in FIG. 5B, when the disk D is completely seated on the turntable 120, that is, when the disk D is in close contact with the pad 122, the protrusion 160 may be connected to the second spring 170. It presses against the inner periphery of the disk D by elastic force. Accordingly, the disk D is clamped by the spring 170 and the protrusion 160 while being seated on the turntable 120 to rotate together with the turntable 120. When the disk D rotates in this state, the other end of the clamper 140 extends to the outer circumference of the boss 130 by centrifugal force, and the bottom of the other end of the clamper 140 is the upper surface of the disk D. It comes in contact with and slides. At this time, in order to prevent the other end of the clamper 140 from being caught by the inner circumference of the disk D, the outer edge portion of the bottom of the other end of the clamper 140 is preferably an inclined surface 143.

As described above, according to the first embodiment of the present invention, when the disk D rotates, the other end of the clamper 140 extends outward of the boss 130 to cover the upper surface of the disk D, Even if an external shock is applied to the disk drive, the disk D is not separated from the protrusion 160. Therefore, it is possible to ensure stable operation of the disk drive. In addition, since the other end of the clamper 140 does not cover the upper surface of the disk D in the state where the turntable 120 does not rotate, the disk D can be easily attached and detached.

6 is a perspective view illustrating a disk clamping device of an optical disk drive according to a second embodiment of the present invention. Since the second embodiment of the present invention is much the same as the above-described first embodiment, it will be described based on the difference.

Referring to FIG. 6, the disk clamping device according to the second embodiment of the present invention is also installed in the boss 230 installed on the turntable 120, and includes a clamper 240 and a first connector connected to the clamper 240. A spring 250 is provided.

The clamper 240 has an installation groove 232 having a predetermined depth formed at the boss 230 so that one end thereof is hinged to the hinge pin 241 so that the other end thereof can rotate at a predetermined angle about the hinge pin 241. It is installed in. The first spring 250 is coupled to the other end of the clamper 240 to elastically bias the other end of the clamper 240 to enter the outer circumference of the boss 230. Therefore, when the turntable 120 does not rotate, the clamper 240 is pulled into the outer circumference of the boss 230 by the elastic force of the first spring 250 as in the first embodiment described above. However, unlike the first embodiment described above, when the turntable 120 is rotated, the other end of the clamper 240 is rotated to the outer circumference of the boss 230 by centrifugal force and pressed close to the inner circumference of the disk D. do. To this end, the other end of the clamper 240 is formed long downward to be in contact with the inner circumference of the disk (D).

In addition, in the second embodiment of the present invention, at least three clampers 240 and first springs 250 are installed. However, the number of clampers 240 and the first spring 250 is not limited to three, each may be provided more. However, considering the narrowness of the clamp 240 installation area according to the size of the boss 230 and the uniform distribution of the force applied to the inner circumference of the disk (D) by the clamp 240 is the three most preferred.

As described above, according to the second embodiment of the present invention, when the disk D rotates, the other end of the clamper 140 extends to the outer circumference of the boss 130 so that the disk D is press-contacted to the inner circumference of the disk D. The disk D can be clamped more firmly. Therefore, the disk can be stably rotated even at high speed. In particular, the faster the rotational speed of the disk D, the greater the centrifugal force acting on the clamper 240, so that the clamping force of the disk D becomes larger, thereby reducing the vibration of the disk D and increasing the high speed. The implementation of the disk drive becomes easy. Moreover, when the clamper 240 is made of a metallic material, the centrifugal force becomes larger, and the force for clamping the disk D becomes larger.

Meanwhile, in the second embodiment of the present invention, as in the above-described first embodiment, the protrusion (160 in FIG. 3) and the second spring (170 in FIG. 3) may be provided. Detailed descriptions of the respective structures and operations are the same as in the above-described first embodiment, and will be omitted. In this case, since the disk D is clamped by the clamper 240 and the protrusions 160 of FIG. 3, the force for clamping the disk D becomes larger.

FIG. 7 is a perspective view illustrating a disk clamping device of an optical disk drive according to a third embodiment of the present invention, and FIG. 8 is a partial cross-sectional view illustrating a disk clamped to the disk clamping device of FIG. 7. Since the third embodiment of the present invention combines the configurations of the first and second embodiments described above, it will be briefly described.

7 and 8, the disk clamping apparatus according to the third embodiment of the present invention includes a clamper 340 and a first spring 350 connected to the clamper 340.

In this embodiment, the cover end 342 and the pressing portion 344 is provided at the other end of the clamper 340. The cover part 342 is rotated by a predetermined angle by the centrifugal force at the time of rotation of the turntable 120 to cover the upper surface of the disk (D), the outer edge portion of the bottom of the disk without being caught in the inner circumference of the disk (D) The inclined surface 343 is formed to be in contact with the upper surface of (D) and to slide. The pressing part 344 is formed to be long downward, and when the turntable 120 rotates, the pressing part 344 rotates to the outer circumference of the boss 330 by centrifugal force and is pressed against the inner circumference of the disk D. Such a clamper 340 is also preferably made of a metal material in order to increase the centrifugal force. Configuration and operation of the first spring 350 is the same as the above-described embodiments.

Meanwhile, reference numeral 341 denotes a hinge pin at which one end of the clamper 340 is hinged, and reference numeral 332 denotes an installation groove in which the clamper 340 and the first spring 350 are installed.

And, in the third embodiment of the present invention, it is preferable that at least three clampers 340 and first springs 350 are installed for the same reason as described above.

Also, in the third embodiment of the present invention, as in the above-described first embodiment, the protrusion (160 in FIG. 3) and the second spring (170 in FIG. 3) may be provided. Detailed descriptions of the respective structures and operations are the same as in the above-described first and second embodiments, and thus will be omitted.

As described above, according to the third embodiment of the present invention, when the disk D rotates, the cover part 342 of the clamper 340 covers the upper surface of the disk D, so that an external shock is applied to the disk drive. Since the disk D is not separated and the pressing portion 344 of the clamper 340 is pressed against the inner circumference of the disk D, the disk D can be clamped more firmly. Therefore, even in the high speed disk drive, the vibration of the disk D is reduced and more stable rotation is possible.

Although the present invention has been described with reference to the disclosed embodiments, these are merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

As described above, the disk clamping device and the optical disk drive having the same according to the present invention have the following effects.

First, since the clamper rotated by the centrifugal force generated by the rotation of the turntable covers the upper surface of the disk when the disk is rotated, it is possible to prevent the disk from being separated by an impact from the outside.

Secondly, since the clamper is firmly pressed against the inner circumference of the disk by the centrifugal force at the time of rotation of the turntable, it is possible to clamp the disk more firmly. Therefore, the disk can be stably rotated even at high speed.

Third, when the turntable is not rotated, the clamper is pulled into the outer circumference of the boss by a spring, so that the disk can be easily attached and detached.

Claims (20)

In the disk clamping apparatus of the optical disk drive is installed in the boss formed at a predetermined height in the center of the turntable to be inserted into the mounting hole in the center of the disk clamping the disk seated on the turntable, A clamper, one end of which is hinged to the boss of the turntable, the other end of which is rotated by a centrifugal force generated by the rotation of the turntable to extend outward of the boss to clamp the disk; And And a first spring coupled to the other end of the clamper and elastically biased to allow the other end of the clamper to enter the outer circumference of the boss. The method of claim 1, And the other end of the clamper to cover the upper surface of the disk when the turntable is rotated. The method of claim 2, And at least one of the clamper and the first spring is installed. The method of claim 2, And an outer edge portion of the bottom surface of the other end of the clamper is inclined. The method of claim 1, And the other end of the clamper is pressed against the inner circumference of the disk at the time of rotation of the turntable. The method of claim 1, The other end of the clamper is provided with a cover portion which covers the upper surface of the disk when the turntable is rotated, and a pressing portion which is pressed against the inner circumference of the disk when the turntable is rotated. Disc clamping device. The method of claim 6, And an outer edge portion of the bottom surface of the cover portion is inclined. The method according to claim 5 or 6, At least three clampers and the first springs are installed along the outer circumference of the boss at equal intervals. The method of claim 1, An installation groove having a predetermined depth is formed in an upper portion of the boss, and the clamper and the first spring are installed in the installation groove. The method of claim 1, The clamper is a disk clamping device of an optical disk drive, characterized in that made of a metallic material. The method of claim 1, And the first spring is a tension coil spring. The method of claim 1, A protrusion installed on the outer circumference of the boss to move a predetermined distance in the radial direction of the boss, and a protrusion installed inside the boss to elastically bias the protrusion to the outside so that the protrusion adheres to the inner circumference of the disk seated on the turntable. And a second spring configured to clamp the disk of the optical disk drive. The method of claim 12, And at least three protrusions and the second springs are disposed along the outer circumference of the boss at equal intervals. The method of claim 12, And the clamper and the protrusion are alternately arranged along the outer circumference of the boss. The method of claim 12, And the second spring is a compression coil spring. The method of claim 1, And the disk clamping device is applied to a slim optical disk drive used in a portable computer. A spindle motor for rotating the disc, a turntable provided at the top of the spindle motor, an optical pickup for recording and reproducing data by irradiating light onto the recording surface of the disc, and a central portion of the turntable to be inserted into a mounting hole in the center of the disc. An optical disk drive having a disk clamping device for clamping a disk mounted on a boss formed at a predetermined height on a turntable, The disk clamping device, A clamper, one end of which is hinged to the boss of the bullet table, the other end of which is rotated by a centrifugal force generated by the rotation of the turntable to extend outward of the boss to clamp the disk; And And a first spring coupled to the other end of the clamper to elastically bias the other end of the clamper to enter the outer circumference of the boss. The method of claim 17, And the other end of the clamper to cover an upper surface of the disk when the turntable rotates. The method of claim 17, And the other end of the clamper is pressed against the inner circumference of the disk when the turntable is rotated. The method of claim 17, The other end of the clamper is provided with a cover portion which covers the upper surface of the disk when the turntable is rotated, and a pressing portion which is pressed against the inner circumference of the disk when the turntable is rotated.