JP2005339737A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cool a heat generation part of an optical pickup whichever position the optical pickup is in. <P>SOLUTION: An optical disk device is provided with; a rotating part for rotating an optical disk medium; the optical pickup provided with a laser light emission part which generates laser light to be radiated to the optical disk medium; an air current generation part for generating an air current; and a flexible tube which guides the generated air current to the optical pickup in order to cool the laser light emission part. Gas is always intensively blown to the laser light emission part by using the flexible tube though the optical pickup is moved , so that the laser light emission part is efficiently cooled. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooling structure for an optical disc drive apparatus that executes at least one of recording information on an optical disc medium and reproducing information from the optical disc medium.

  FIG. 1 is a perspective view showing a main part of a conventional optical disc apparatus 100 (see Patent Document 1). FIG. 2 is a cross-sectional view showing a main part of the optical disc apparatus 100.

  An optical disk device 100 generates a motor 1 having a motor rotating shaft 2, a turntable 3, a disk-shaped optical disk medium 4, a clamper 5 for holding the optical disk medium 4, an optical pickup 6, and a laser beam 11. The laser light emitting unit 7 for rotating, the mirror 8 for changing the direction of the laser beam, the objective lens 9, the blade 13, the objective lens holder 14 for holding the objective lens 9, and the optical pickup 6 in the disk radial direction 10 And a guide shaft 15 for moving along. The laser light emitting unit 7 is, for example, a laser diode. The objective lens holder 14 is movable relative to the optical pickup 6 so that the focus control of the laser beam 11 can be performed. As the motor rotation shaft 2 rotates in the direction of rotation 12, the optical disk medium 4 also rotates in the direction of rotation 12. Arrow 16 indicates the flow of air.

  The direction of the laser beam 11 output from the laser emitting unit 7 is changed by the mirror 8, passes through the objective lens 9, and is irradiated onto the information recording surface of the optical disc medium 4. The reflected light reflected by the optical disk medium 4 is received by a light receiving element (not shown) inside the optical pickup 6 and converted into an electric signal. Information recorded on the optical disk medium 4 is read from the electric signal.

In the optical disc apparatus 100, a laser emission unit 7 is built in the optical pickup 6. The laser light emitting unit 7 has a problem that when the temperature becomes high, the life is shortened and the performance is remarkably deteriorated. Due to the temperature rise, performance problems such as a decrease in the irradiation intensity of the laser light 11 and a change in the optical axis due to thermal expansion of the lens occur. For this reason, it is necessary to cool the laser emission unit 7 so as not to reach a high temperature. In order to cool the laser emitting unit 7, it has been proposed that a blade unit 13 is provided at the lower part of the turntable 3 like the optical disc device 100 and the optical pickup 6 is blown by the blade unit 13.
JP-A-11-110959

  The optical pickup 6 moves in the disc radial direction. For this reason, when the optical pickup 6 leaves | separates from the blade | wing part 13, there existed a subject that an air cooling effect fell. Further, when the laser light emitting unit 7 is located inside the optical pickup 6, or when the laser light emitting unit 7 is located on the outer peripheral side of the optical pickup 6, air cannot be blown to the laser light emitting unit 7. The laser emitting part 7 could not be cooled efficiently.

  An object of the present invention is to provide an optical disc apparatus capable of suppressing a temperature rise of a laser light emitting unit incorporated in an optical pickup regardless of the position of the optical pickup and the laser light emitting unit.

  An optical disk apparatus according to the present invention includes a rotating unit that rotates an optical disk medium, an optical pickup that includes a laser light emitting unit that generates laser light to be irradiated onto the optical disk medium, an air flow generating unit that generates an air flow, and the laser light emitting unit. In order to cool the battery, a flexible tube that guides the generated airflow to the optical pickup is provided, thereby achieving the object.

  The optical pickup may have means for guiding the airflow to the laser light emitting unit.

  The optical pickup may include a connection portion connected to one end of the flexible tube and a flow path formed inside the optical pickup.

  A means for providing one end of the flexible tube inside the optical pickup may be further provided.

  The rotating unit further includes a turntable for loading the optical disk medium, and a clamper for detachably holding the optical disk medium, and the airflow generation unit includes the optical disk medium of the turntable. A blade portion provided on a surface opposite to the opposite surface, and a wall portion surrounding at least a part of the blade portion, and the blade portion receives a rotational motion of a motor that rotates the turntable. The wall portion may have an exhaust port to which one end of the flexible tube is connected.

  The turntable is formed with at least one through-hole for moving the gas on the second surface side of the optical disk medium opposite to the first surface facing the optical pickup to the first surface side. The gas on the second surface side may move to the first surface side through the at least one through hole by the rotation of the blade portion.

  A heat radiating member in contact with the laser light emitting unit may be further provided, and the gas output from the flexible tube may be blown onto the heat radiating member.

  You may further provide the dustproof filter provided in the said flow path.

  You may further provide the at least 1 dustproof filter provided in at least one of the said exhaust port and the said flexible tube.

  The flexible tube may be stretchable.

  The flexible tube may have a bellows shape.

  The flexible tube may have a rubber member.

  The optical disc apparatus of the present invention includes an air flow generating unit that generates an air flow and a flexible tube that guides the generated air flow to an optical pickup in order to cool the laser light emitting unit. The gas moving along the airflow passes through the flexible tube, is collected in the optical pickup, and is blown to the laser light emitting unit (and / or the heat radiating member in contact with the laser light emitting unit). By concentrating the moving gas in the optical pickup using the flexible tube, it is possible to prevent the moving gas from diffusing around the optical pickup. Thereby, the laser emission part can be efficiently cooled. Furthermore, since the tube has flexibility, even if the optical pickup moves to any position in the radial direction of the disk, it can be freely bent in accordance with the movement and always blown to the laser emitting section.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the embodiment of the present invention, the same reference numerals are given to the same components, and the detailed description is omitted.

(Embodiment 1)
FIG. 3 is a cross-sectional view of the main part of the optical disc apparatus 300 according to Embodiment 1 of the present invention. FIG. 4 is a cross-sectional view of the components of the optical disc apparatus 300 taken along line AA in FIG.

  An optical disk device 300 generates a motor 1 having a motor rotating shaft 2, a turntable 3, a disk-shaped optical disk medium 4, a clamper 5 for holding the optical disk medium 4, an optical pickup 6, and a laser beam 11. A laser emitting unit 7 for performing the operation, a mirror 8 for changing the direction of the laser beam 11, an objective lens 9, a blade unit 13, an objective lens holder 14 for holding the objective lens 9, and the optical pickup 6 in the disk radial direction 10 , A flexible tube 17, and an outer peripheral wall portion 18 that surrounds at least a part of the blade portion 13.

  The turntable 3 is loaded with a disk-shaped optical disk medium 4. The clamper 5 holds the optical disk medium 4 in a detachable manner. The optical pickup 6 includes a laser light emitting unit 7 that generates a laser beam 11 to be irradiated to the optical disk medium 4, and executes at least one of recording information on the optical disk medium 4 and reproducing information from the optical disk medium 4. . The laser light emitting unit 7 is a laser diode, for example. The objective lens holder 14 is movable relative to the optical pickup 6 so that the focus control of the laser beam 11 can be performed. The optical pickup 6 further includes a base, a light receiving element (not shown), and the like.

  The optical pickup 6 moves along the radial direction 10 of the optical disk medium 4. The direction of the laser beam 11 output from the laser emitting unit 7 is changed by the mirror 8, passes through the objective lens 9, and is irradiated onto the information recording surface of the optical disc medium 4. The optical pickup 6 reproduces information recorded on the optical disk medium 4 by converting reflected light when the optical disk medium 4 is irradiated with the laser light 11 into an electric signal. Further, the optical pickup 6 records information on the optical disk medium 4 by irradiating the optical disk medium 4 with the laser beam 11 to cause phase transition of the optical disk medium 4.

  The clamper 5 is fixed on the turntable 3 so as to be concentric with the turntable 3. A hole is formed in the vicinity of the center of rotation of the optical disk medium 4, and the optical disk medium 4 is held on the turntable 3 by engaging the clamper 5 with the hole. The turntable 3 and the clamper 5 form a rotating unit that holds and rotates the optical disc medium 4. The motor rotating shaft 2 is fixed to the motor 1. The turntable 3 and the clamper 5 are fixed to the motor rotation shaft 2 and rotate in the direction of the rotation direction 12 when the rotation motion of the motor 1 is transmitted. The optical disk medium 4 held on the turntable 3 and the clamper 5 also rotates in the direction of the rotation direction 12.

  The blade portion 13 is provided on the surface of the turntable 3 opposite to the surface facing the optical disk medium 4. The blade portion 13 is provided so as to be concentric with the turntable 3. The blade portion 13 is rotated by transmission of the rotational motion of the motor 1 that rotates the turntable 3 to generate an air flow. An airflow generating portion that generates an airflow is formed by the blade portion 13 and the outer peripheral wall portion 18 surrounding at least a part of the blade portion 13. An exhaust port 19 is formed in the outer peripheral wall portion 18, and one end of the flexible tube 17 is connected to the exhaust port 19. The other end of the flexible tube 17 is connected to the vicinity of the laser light emitting unit 7 in the optical pickup 6.

  The flexible tube 17 guides the airflow generated by the rotational movement of the blade portion 13 to the optical pickup. Arrow 16 indicates the flow of air. Almost all of the air moving along the airflow is collected in the optical pickup through the flexible tube and blown to the laser emitting section. Thereby, the laser emission part 7 is air-cooled.

  In the present embodiment, almost all of the air moving along the airflow is concentrated in the optical pickup using the flexible tube, so that the moving air is prevented from diffusing around the optical pickup 6. I can do it. Thereby, the laser emission part 7 can be cooled efficiently. Further, since the tube has flexibility, even if the optical pickup 6 moves to any position in the radial direction of the disk, the tube can be freely bent in accordance with the movement and always blown to the laser emitting unit 7.

  According to the present embodiment, the laser light emitting unit 7 can be air-cooled even if the position of the laser light emitting unit 7 in the optical pickup 6 is leeward, and the optical pickup 6 can be located at any position in the disk radial direction. The same air volume can be supplied, and the air cooling of the laser emitting unit 7 can be performed stably.

  Moreover, since the turntable 3 and the blade | wing part 13 are rotated with the same one motor 1, the cost and space required in order to rotate the blade | wing part 13 can be reduced.

(Embodiment 2)
FIG. 5 is a cross-sectional view of an optical pickup 506 that is a modified example of the optical pickup 6. The optical pickup 506 includes a connection part 21 to which the end of the flexible tube 17 is connected, and a flow path 20 for guiding the airflow to the laser light emitting part 7.

  In the present embodiment, a flow path 20 for passing air through the optical pickup 506 is provided. The air output from the flexible tube 17 is guided to the laser emission unit 7 from the connection unit 21 through the flow path 20. Thereby, the laser emission part 7 can be directly air-cooled. Furthermore, even if the inside of the optical pickup 506 is heated by the laser light emitting unit 7, the air passing through the flow path 20 can cool the inside of the optical pickup 506 as well. For this reason, the temperature rise of the laser light emission part 7 and the optical pick-up 506 can be suppressed highly efficiently. The flexible tube 17 and the optical pickup 506 can be connected by use of an adhesive, heat welding between the tube and the connection portion, or the like.

(Embodiment 3)
FIG. 6 is a cross-sectional view of an optical pickup 606 that is a modification of the optical pickup 506. The optical pickup 606 includes a groove 22 for providing the end of the flexible tube 17 inside the optical pickup 606. The end of the flexible tube 17 inserted into the groove 22 is located in the vicinity of the laser light emitting unit 7.

  In the present embodiment, the laser emission unit 7 can be directly air-cooled by the air output from the flexible tube 17. Furthermore, even if the inside of the optical pickup 606 is heated by the laser emitting unit 7, the air passing through the flexible tube 17 inserted into the groove 22 can cool the inside of the optical pickup 606. For this reason, the temperature rise of the laser light emission part 7 and the optical pick-up 606 can be suppressed highly efficiently.

  The flexible tube 17 and the groove 22 can be fixed easily by applying an adhesive to the flexible tube 17 and the groove 22.

(Embodiment 4)
FIG. 7 is a cross-sectional view of the main part of an optical disc apparatus 700 according to Embodiment 4 of the present invention. The optical disc apparatus 700 further includes a dustproof filter 23 provided at the exhaust port 19 in addition to the components of the optical disc apparatus 300.

  The optical disc apparatus 700 includes a clamper 705, a turntable 703, and an outer peripheral wall portion 718 instead of the clamper 5, the turntable 3, and the outer peripheral wall portion 18. At least one through-hole 710 is formed in each of the clamper 705 and the turntable 703. In the present embodiment, a plurality of through holes 710 are formed. The through hole 710 functions as means for moving the gas on the second surface side of the optical disk medium 4 opposite to the first surface facing the optical pickup 6 to the first surface side. In the present embodiment, the first surface is the lower surface of the optical disk medium 4 and the second surface is the upper surface of the optical disk medium 4. In the embodiment in which the rotation axis of the optical disk medium 4 is in the horizontal direction, the first surface and the second surface are the left and right surfaces.

  The outer peripheral wall portion 718 also surrounds the side of the blade portion 13 that faces the motor 1. As the blade portion 13 rotates, the air near the blade portion 13 moves to the flexible tube 17. However, since the air pressure in the vicinity of the blade portion 13 becomes negative pressure as it is, air on the upper surface of the clamper 705 (that is, air on the upper surface side of the optical disk medium 4) passes through the through-hole 710 in order to compensate for the negative pressure. Suction is performed in the vicinity of the blade 13 on the lower surface. The sucked air moves to the flexible tube 17 by the blade portion 13.

  While the optical disk device 700 is being driven, the temperature of the air on the upper surface side of the optical disk medium 4 is lower than the air on the lower surface side of the optical disk medium 4. Since the air on the upper surface side having a low temperature is supplied to the optical pickup 6, the temperature rise of the optical pickup 6 and the laser light emitting unit 7 can be suppressed stably even if time passes.

  In the present embodiment, since the through holes 710 formed in the clamper 705 and the turntable 703 serve as an intake hole, it is not necessary to add a component for intake of air on the upper surface side of the optical disc medium 4. For this reason, cost and space can be reduced.

  Further, according to the present embodiment, the dustproof filter 23 is provided at the exhaust port 19, so that dust in the air is not blown onto the laser emitting unit 7. As a result, it is possible to prevent dust from adhering to the laser light emitting unit 7 and to continuously output laser light having a stable light emission intensity.

  In addition, the dustproof filter 23 may be provided in the flexible tube 17, and may be provided in the flow path 20 (FIG. 5). At least one dustproof filter 23 may be provided in at least one of the exhaust port 19, the flexible tube 17, and the flow path 20.

(Embodiment 5)
FIG. 8 is a cross-sectional view of an optical pickup 806 and a flexible tube 24 which are modifications of the optical pickup 506 and the flexible tube 17. The flexible tube 24 has a bellows shape that can be expanded and contracted.

  In the present embodiment, the flexible tube 24 is connected to the lower part of the optical pickup 806. The optical pickup 806 is formed with an air hole 25 for guiding an air flow to the surface of the laser light emitting unit 7. When the air flows through the air hole 25 from the bottom to the top, the laser emission unit 7 is air-cooled.

  Further, by providing the flexible tube 24 with elasticity, the flexible tube 24 is always the minimum length regardless of the position of the optical pickup 6. For this reason, it is possible to prevent the flexible tube 24 from being entangled with peripheral components.

  In this embodiment, the bellows shape is used to provide stretchability. However, the flexible tube 24 may have elasticity by providing the rubber member with the flexible tube 24.

  In the present embodiment, the optical pickup 806 further includes a heat radiating member 26 in contact with the laser light emitting unit 7. The heat dissipating member 26 includes a material having high thermal conductivity (for example, copper, aluminum, etc.), and diffuses the heat of the laser emitting unit 7 to the outside. The air output from the flexible tube 24 is also blown to the heat radiating member 26. Thereby, the laser emission part 7 can be cooled more efficiently.

  The optical disc apparatus according to the present invention includes an air flow generation unit that generates an air flow and a flexible tube that guides the generated air flow to an optical pickup in order to cool the laser light emitting unit. By concentrating the moving gas in the optical pickup using a flexible tube, the laser emitting section can be efficiently cooled. Furthermore, since the tube has flexibility, even if the optical pickup moves to any position in the radial direction of the disk, it can be freely bent in accordance with the movement and always blown to the laser emitting section.

  As described above, the present invention is useful in the field of an optical disc apparatus provided with an optical pickup.

The perspective view which shows the principal part of the conventional optical disk apparatus Sectional drawing which shows the principal part of the conventional optical disk apparatus Sectional drawing which shows the principal part of the optical disk apparatus of Embodiment 1 of this invention Sectional drawing which shows the principal part of the optical disk apparatus of Embodiment 1 of this invention Sectional drawing of the optical pick-up of Embodiment 2 of this invention Sectional drawing of the optical pick-up of Embodiment 3 of this invention Sectional drawing which shows the principal part of the optical disk apparatus of Embodiment 4 of this invention. Sectional drawing which shows the principal part of the optical disk apparatus of Embodiment 5 of this invention Sectional drawing of the optical pick-up of Embodiment 5 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Motor shaft 3 Turntable 4 Optical disk medium 5 Clamper 6 Optical pick-up 7 Laser emission part 8 Mirror 9 Objective lens 10 Moving direction 11 Laser light 12 Rotating direction 13 Blade part 14 Objective lens holder 15 Guide shaft 16 Airflow 17 Flexibility Tube 18 Outer peripheral wall portion 19 Exhaust port 20 Flow path 21 Connection portion 22 Groove 23 Dustproof filter 24 Bellows tube 25 Air hole

Claims (12)

A rotating unit for rotating the optical disk medium;
An optical pickup including a laser light emitting unit for generating laser light to be irradiated onto the optical disc medium;
An airflow generating section for generating an airflow;
An optical disc apparatus comprising: a flexible tube for guiding the generated airflow to the optical pickup in order to cool the laser light emitting unit.   The optical disk apparatus according to claim 1, wherein the optical pickup includes means for guiding the airflow to the laser light emitting unit. The optical pickup is
A connecting portion connected to one end of the flexible tube;
The optical disk apparatus according to claim 1, further comprising: a flow path formed inside the optical pickup.   The optical disc apparatus according to claim 1, further comprising means for providing one end of the flexible tube inside the optical pickup. The rotating part is
A turntable for loading the optical disc medium;
A clamper for detachably holding the optical disk medium,
The air flow generation unit is
A blade portion provided on the surface of the turntable opposite to the surface facing the optical disc medium;
A wall portion surrounding at least a part of the blade portion, and
The blade part is rotated by transmitting a rotational motion of a motor that rotates the turntable,
The optical disk apparatus according to claim 1, wherein the wall portion has an exhaust port to which one end of the flexible tube is connected. The turntable is formed with at least one through-hole for moving the gas on the second surface side of the optical disk medium opposite to the first surface facing the optical pickup to the first surface side. And
The optical disc apparatus according to claim 5, wherein the gas on the second surface side moves to the first surface side through the at least one through hole by the rotation of the blade portion. A heat dissipating member in contact with the laser light emitting unit;
The optical disk apparatus according to claim 1, wherein the gas output from the flexible tube is blown onto the heat radiating member.   The optical disc apparatus according to claim 3, further comprising a dustproof filter provided in the flow path.   The optical disc apparatus according to claim 5, further comprising at least one dustproof filter provided in at least one of the exhaust port and the flexible tube.   The optical disc apparatus according to claim 1, wherein the flexible tube is extendable.   The optical disk apparatus according to claim 10, wherein the flexible tube has a bellows shape.   The optical disk apparatus according to claim 10, wherein the flexible tube includes a rubber member.

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