Optical disc drive using noise reducing unit

1. An optical disc drive, in which an optical disk is rotated so that information is readable therefrom and writable thereonto, comprising:

a main frame, in which a turntable is provided;

a tray, on which the optical disc is mounted and which is slidable in the main frame;

a cover, which covers a top surface of the main frame and includes a clamper to fix the optical disc in the turntable; and

a noise reducer, which is disposed in the cover and causes air that is generated by the rotation of the optical disc to circulate from an inner circumference to an outer circumference of the optical disc and from the outer circumference to the inner circumference thereof, to reduce a noise generated by the circulation of the air, wherein the noise reducer comprises:

a clamper mounting portion, on which the clamper is seated and which provides a path through which the circulation of the air flows;

a space portion, which has a predetermined concave area to surround the clamper mounting portion;

an extension portion adjacent to the space portion in which air density is decreased;

a plurality of first through holes formed in the cover at predetermined intervals so that the extension portion adjacent to the space portion and the space portion communicate with each other; and

a plurality of second through holes formed in the clamper mounting portion at predetermined intervals so that the space portion and the clamper mounting portion communicate with each other.

2. The optical disc drive of claim 1 , wherein the space portion is isolated from the outside by a sealing portion placed on a top surface of the space portion.

3. The optical disc drive of claim 1 , wherein the height of the space portion is larger than that of a gap between the optical disc and the cover.

4. The optical disc drive of claim 1 , wherein the space portion has a ring shape.

5. A noise reducer of an optical disk drive, in which an optical disk is rotated on a main frame so that information is readable therefrom and writable thereonto and such that sound energy is generated by a circulation of air caused by the rotation of the optical disk, the noise reducer comprising:

a cover, to cover a top surface of the main frame, including a clamper to fix the optical disc during the rotation;

a clamper mounting portion, on which the clamper is seated, to define a path of the circulation of air;

a noise reduction section to decrease the density of the circulated air to reduce the sound energy of the air; and

a plurality of first through holes to allow the noise reduction section and the clamper mounting portion to communicate with each other such that circulated air enters the noise reduction section, wherein the noise reduction section comprises:

a space portion, which has a predetermined concave area to surround the clamper mounting portion;

an extension portion adjacent to the space portion in which air density is decreased when the optical disk is rotated; and

a plurality of second through holes to allow the space portion and the extension portion to communicate with each other and to allow the space portion and the path of the circulation of air to communicate with each other.

6. The noise reducer according to claim 5 , further comprising a clamper supporting portion, to support the clamper and which is formed under the clamper mounting portion and to protrude from the clamper mounting portion.

7. The noise reducer according to claim 5 , further comprising a clamper cover to cover the clamper mounting portion after the clamper is mounted on the clamper mounting portion and which is formed on the surface of the clamper mounting portion.

8. The noise reducer according to claim 5 , further comprising a magnet in the clamper to fix the optical disk.

9. The noise reducer according to claim 5 , wherein the noise reduction section comprises a space portion having a concave area proximate to a top surface of the cover to surround the clamper mounting portion.

10. The noise reducer according to claim 9 , wherein the noise reduction section comprises an extension portion in which the density of the circulated air is decreased.

11. The noise reducer according to claim 10 , wherein the extension portion comprises an acoustic absorbent to absorb the sound energy and reduce noise.

12. A noise reducer of an optical disk drive, in which an optical disk is rotated on a main frame so that information is readable therefrom and writable thereonto and such that sound energy is generated by a circulation of air caused by the rotation of the optical disk, the noise reducer comprising:

a cover, to cover a top surface of the main frame, including a clamper to fix the optical disc during the rotation;

a clamper mounting portion, on which the clamper is seated, to define a path of the circulation of air;

a noise reduction section to decrease the density of the circulated air to reduce the sound energy of the air;

a plurality of first through holes to allow the noise reduction section and the clamper mounting portion to communicate with each other such that circulated air enters the noise reduction section,

wherein the noise reduction section comprises a space portion having a concave area proximate to a top surface of the cover to surround the clamper mounting portion; and a sealing portion to isolate the space portion.

13. A noise reducer of an optical disk drive, in which an optical disk is rotated on a main frame so that information is readable therefrom and writable thereonto and such that sound energy is generated by a circulation of air caused by the rotation of the optical disk, the noise reducer comprising:

a cover, to cover a top surface of the main frame, including a clamper to fix the optical disc during the rotation;

a clamper mounting portion, on which the clamper is seated, to define a path of the circulation of air;

a noise reduction section to decrease the density of the circulated air to reduce the sound energy of the air; and

a plurality of first through holes to allow the noise reduction section and the clamper mounting portion to communicate with each other such that circulated air enters the noise reduction section,

wherein the noise reduction section comprises a space portion having a concave area proximate to a top surface of the cover to surround the clamper mounting portion, and the space portion has a height which is greater than a height between a top surface of the optical disk and a lower surface of the clamper mounting portion.

14. A noise reducer of an optical disk drive, in which an optical disk is rotated on a main frame so that information is readable therefrom and writable thereonto and such that sound energy is generated by a circulation of air caused by the rotation of the optical disk, the noise reducer comprising:

a cover, to cover a top surface of the main frame, including a clamper to fix the optical disc during the rotation;

a clamper mounting portion, on which the clamper is seated, to define a path of the circulation of air;

a noise reduction section to decrease the density of the circulated air to reduce the sound energy of the air;

a plurality of first through holes to allow the noise reduction section and the clamper mounting portion to communicate with each other such that circulated air enters the noise reduction section, wherein the noise reduction section comprises a space portion having a concave area proximate to a top surface of the cover to surround the clamper mounting portion, wherein the noise reduction section comprises an extension portion in which the density of the circulated air is decreased; and

a plurality of second through holes to allow the extension portion and the space portion to communicate with each other.

15. A noise reducer of an optical disk drive, in which an optical disk is rotated on a main frame so that information is readable therefrom and writable thereonto and such that sound energy is generated by a circulation of air caused by the rotation of the optical disk, the noise reducer comprising:

a cover, to cover a top surface of the main frame, including a clamper to fix the optical disc during the rotation;

a clamper mounting portion, on which the clamper is seated, to define a path of the circulation of air;

a noise reduction section to decrease the density of the circulated air to reduce the sound energy of the air;

a plurality of first through holes to allow the noise reduction section and the clamper mounting portion to communicate with each other such that circulated air enters the noise reduction section, wherein the noise reduction section comprises a space portion having a concave area proximate to a top surface of the cover to surround the clamper mounting portion, wherein the noise reduction section comprises an extension portion in which the density of the circulated air is decreased; and

a plurality of second through holes to allow the extension portion and the space portion to communicate with each other, further comprising the second through holes to allow the space portion and the path of the circulation of air to communicate with each other.

16. A noise reducer of an optical disk drive, in which an optical disk is rotated on a main frame so that information is readable therefrom and writable thereonto such that sound energy is generated by a circulation of air caused by the rotation of the optical disk, the noise reducer comprising:

a cover, to cover a top surface of the main frame, including a clamper to fix the optical disc during the rotation;

a clamper mounting portion, on which the clamper is seated, to define a path of the circulation of air;

a noise reduction section to surround the clamper mounting portion and to decrease the density of the circulated air to reduce the sound energy of the air; and

first through holes to allow the noise reduction section and the clamper mounting portion to communicate with each other such that circulated air enters the noise reduction section, wherein the noise reduction section comprises:

a space portion, which has a predetermined concave area to allow the noise reduction section to surround the clamper mounting portion;

an extension portion adjacent to the space portion in which air density is decreased when the optical disk is rotated; and

second through holes to allow the space portion and the extension portion to communicate with each other and to allow the space portion and the path of the circulation of air to communicate with each other.

17. The noise reducer according to claim 16 , further comprising a clamper supporting portion, to support the clamper and which is formed under the clamper mounting portion and to protrude from the clamper mounting portion.

18. The noise reducer according to claim 16 , further comprising clamper cover to cover the clamper mounting portion after the clamper is mounted on the clamper mounting portion and which is formed on the surface of the clamper mounting portion.

19. The noise reducer according to claim 16 , further comprising a magnet in the clamper to fix the optical disk.

20. The noise reducer according to claim 16 , wherein the noise reduction section comprises a space portion having a concave area proximate to a top surface of the cover to surround the clamper mounting portion.

21. A noise reducer of an optical disk drive, in which an optical disk is rotated on a main frame so that information is readable therefrom and writable thereonto such that sound energy is generated by a circulation of air caused by the rotation of the optical disk, the noise reducer comprising:

a cover, to cover a top surface of the main frame, including a clamper to fix the optical disc during the rotation;

a clamper mounting portion, on which the clamper is seated, to define a path of the circulation of air;

a noise reduction section to surround the clamper mounting portion and to decrease the density of the circulated air to reduce the sound energy of the air;

first through holes to allow the noise reduction section and the clamper mounting portion to communicate with each other such that circulated air enters the noise reduction section, wherein the noise reduction section comprises a space portion having a concave area proximate to a top surface of the cover to surround the clamper mounting portion; and

a sealing portion to isolate the space portion.

22. A noise reducer of an optical disk drive, in which an optical disk is rotated on a main frame so that information is readable therefrom and writable thereonto such that sound energy is generated by a circulation of air caused by the rotation of the optical disk, the noise reducer comprising:

a cover, to cover a top surface of the main frame, including a clamper to fix the optical disc during the rotation;

a clamper mounting portion, on which the clamper is seated, to define a path of the circulation of air;

a noise reduction section to surround the clamper mounting portion and to decrease the density of the circulated air to reduce the sound energy of the air; and

first through holes to allow the noise reduction section and the clamper mounting portion to communicate with each other such that circulated air enters the noise reduction section, wherein the noise reduction section comprises a space portion having a concave area proximate to a top surface of the cover to surround the clamper mounting portion, wherein the space portion has a height which is greater than a height between a top surface of the optical disk and a lower surface of the clamper mounting portion.

23. A noise reducer of an optical disk drive, in which an optical disk is rotated on a main frame so that information is readable therefrom and writable thereonto such that sound energy is generated by a circulation of air caused by the rotation of the optical disk, the noise reducer comprising:

a cover, to cover a top surface of the main frame, including a clamper to fix the optical disc during the rotation;

a clamper mounting portion, on which the clamper is seated, to define a path of the circulation of air;

a noise reduction section to surround the clamper mounting portion and to decrease the density of the circulated air to reduce the sound energy of the air;

first through holes to allow the noise reduction section and the clamper mounting portion to communicate with each other such that circulated air enters the noise reduction section, wherein the noise reduction section comprises a space portion having a concave area proximate to a top surface of the cover to surround the clamper mounting portion, wherein the noise reduction section comprises an extension portion in which the density of the circulated air is decreased; and

second through holes to allow the extension portion and the space portion to communicate with each other.

24. An optical disc drive, in which an optical disk is rotated so that information is readable therefrom and writable thereonto, comprising:

a main frame, in which a turntable is provided;

a tray, on which the optical disc is mounted and which is slidable in the main frame;

a cover, which covers a top surface of the main frame and includes a clamper to fix the optical disc in the turntable;

a noise reducer, which is disposed in the cover and causes air that is generated by the rotation of the optical disc to circulate from an inner circumference to an outer circumference of the optical disc and from the outer circumference to the inner circumference thereof, to reduce a noise generated by the circulation of the air,

wherein the cover is above the disc, with the air passing between the cover and the disc from the inner circumference to the outer circumference;

a sealing portion above the cover defining a space between the sealing portion and the cover; and

a through hole formed in the cover in fluid communication with the space to pass air from between the disc and the cover into the space and from the outer circumference to the inner circumference via the space.