JPH0644768A - Disk device - Google Patents

Abstract

PURPOSE:To improve heat radiation and dustproof functions and to greatly improve MTBF by sealing an optical head together with other elements and providing a heat pipe. CONSTITUTION:The optical head is sealed together with a disk inserting and discharging mechanism 10 and a unit mechanism 13 by cases 1, 2 and caps 8, 9 so as to prevent the infiltration of the dust deposited on the objective lens of the optical head. If a disk motor 12, an electronic element, the laser diode of an optical head, a linear motor, etc., generate heat, the heat thereof is transmitted through the rear surface of the unit mechanism 13 to the heat input part 14a of a heat pipe 14, by which the liquid in a pipe 14 is changed to vapor. The vapor is condensed to liquid in the part of the heat radiation part 14b where the temp. of the pipe is min. The latent heat is moved to the pipe walls and is radiated. The motor 12, the electronic element, the laser diode of the optical head, etc., are cooled and are kept at the performance assurance temp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust-proof and heat-dissipating device in an optical or magneto-optical disk recording / reproducing device.

[0002]

2. Description of the Related Art An optical disk recording / reproducing apparatus is an apparatus for recording and reproducing high density information on an optical disk which is an optical recording medium, and has a feature that the recording medium can be easily replaced. On the other hand, because it handles light, the accumulation of dust in the air for long-term use may interfere with the laser light output or reflected and condensed from the objective lens of the optical head, resulting in poor performance such as poor access. was there.

A linear motor for driving a laser diode, a disk rotating motor, and an optical head mounting mechanism.
The tor heats up during reading and writing of the disk, and the temperature exceeds the temperature range that guarantees the performance of electronic and electric parts that are densely arranged in a narrow space inside the device, which shortens the life of the device.

For this reason, conventional devices include a device for determining a flow path of air so as to prevent dust that enters with air from coming close to the optical head, and a device for providing an air filter at an air inlet as a dustproof. It was A device related to this type of device is disclosed in, for example, Japanese Patent Application Laid-Open No. 62-52785.
-298074, 63-293783, 64-5
No. 2279 ”and the like. In addition, for heat dissipation, there is a method of circulating air in the device. A device related to this kind of device is disclosed in, for example, JP-A-64-43888.
Etc.

[0005]

The above-mentioned prior art does not deal with heat dissipation and dust prevention at the same time, and in order to exert the heat dissipation effect, if air circulation in the device is improved, dust will enter along with air and the dustproof performance will be improved. If the inside of the device is partitioned by a partition wall or the part including the optical head is wrapped with a case in order to improve the dustproof performance, the heat dissipation effect will deteriorate and the service life of the device will be shortened. It was

It is an object of the present invention to provide a device in which the optical head is sealed with other elements and a heat pipe is provided to improve the heat radiation and dustproof functions and greatly improve the MTBF. .

[0007]

In order to achieve the above object, a unit including a pickup drive unit, a disc motor, a disc insertion / ejection mechanism, etc. is substantially sealed with a case and a lid for opening / closing the disc insertion / ejection port. However, a power source such as a transformer is installed in the upper part, and a working fluid consisting of a liquid such as water is placed in a metallic tubular container equipped with a gold net, a groove, etc. with a capillary action on the inner wall surface. The heat input part of the heat pipe is hermetically sealed with a heat input part on one side and a heat dissipation part on the other side with fins if necessary, and the heat input part on the bottom side of the disk motor or the top or bottom side of the case. Abutting against. Further, an electronic element for controlling the rotational speed of the disk motor is provided outside the case.

[0008]

Since the optical head is almost sealed by the case and the lid, dust is unlikely to enter, and since the power source is located above the case, warmed air flows to the upper part to keep the temperature of the case high. It does not rise.

Further, the heat generated by the disk motor and the electronic element inside the case is such that the liquid inside the heat pipe that has been depressurized evaporates at a lower temperature than the steady state due to the heat input from the heat input section. , It moves to the heat dissipation part, vapor condenses in the lowest temperature part of the heat dissipation part to become a liquid, and returns to the original heat input part. It can be kept within the guaranteed temperature range. Further, since the electronic element for controlling the rotation speed of the disk motor is provided outside the case, the temperature inside the case can be suppressed.

[0010]

Embodiments of the present invention will be described below with reference to FIGS. 2 to 6 are sectional views of the first, second, third, fourth, fifth and sixth embodiments of the disk device according to the present invention.

1 to 3, 1 and 2 are cases and 3
Is a power supply unit such as a power transformer or a switching power supply, 4 is a printed circuit board, 5 is a chassis, 6 is a cover, 7 is a front panel, and 8 and 9 are first opening / closing disc insertion / ejection ports.
The second lid 10 is a disc insertion and ejection mechanism for inserting and ejecting a disc.

Reference numeral 11 is a turntable, and 12 is a disk motor, which is a unit mechanism 13 in which an optical head is mounted and an optical head driving mechanism for driving in the radial direction of the disk is mounted.
Built into. The disk insertion / ejection mechanism 10 and the unit mechanism 13 are both sealed in the cases 1 and 2 and supported by rubber or a spring 17.

Next, the working fluid, which is a liquid such as water, is sealed in a tubular container made of metal, and gold ridges, grooves, etc. having a capillary action are provided on the inner wall surface of the pipe, and the above is placed in the container. It is hermetically sealed in a highly decompressed state, one of which is a heat input portion 14a and the other is a heat radiation portion 14b.
Since the liquid is decompressed by the heat input from the heat input unit 14a, the liquid evaporates at a temperature lower than the steady evaporation temperature, moves to the heat radiating unit 14b, and vapor condenses in the low temperature portion of the heat radiating unit pipe. As a liquid, the latent heat at the time of condensation moves to the wall of the tube, the heat goes out, and the liquid returns to the original heat input part. Further, the heat input portion 14a of the heat pipe 14 is arranged so as to be directly or indirectly fixed to the lower surface of the disk motor 12 or the heat generating portion of the rotation speed control electronic element.

The operation of the heat radiation function of the optical disk device having the above configuration will be described below.

In the optical head of the optical disk device, the disk insertion / ejection mechanism 10 is composed of the cases 1 and 2, the first lid 8 and the second lid 9 so as to prevent the dust accumulated on the objective lens from entering. It is sealed together with the unit mechanism 13. The disk motor 12, the electronic element, the laser diode of the optical head, the linear motor, etc. generate heat, and this heat passes through the back surface of the unit mechanism 13 and the heat input portion 14 of the heat pipe 14
is transmitted to a. The heat transferred to the heat input part 14a changes the liquid in the heat pipe 14 to steam, and in the heat dissipation part 14b, when the steam condenses into liquid at the lowest temperature part of the pipe, latent heat is generated on the wall of the pipe. Moves to and is radiated. The disk motor 12, the electronic device, the laser diode of the optical head, etc. are cooled and kept at a temperature for ensuring performance. In addition, the heat input portion 14a of the heat pipe 14 is provided in the second and third embodiments shown in FIG.
There is also a method of fixing to the case 1 or 2 as shown in FIG.

Next, FIG. 4 will be described below as a fourth embodiment.

In the figure, the same parts as those in the previous section are designated by the same reference numerals. In addition, 20 is a thick flat cooling pillow in which a fluorine-based inert liquid 19 containing no hydrogen or chlorine such as perfluorocarbon liquid is sealed with a thin sheet material 18. The cooling pillow 20 is in contact with the upper surface of the case 1 and the inner surface of the cover 6, and is fixed by an angle 21 fixed to the case 1. Similar to the above example,
The heat of the rotor 12 and the electronic device for controlling the number of revolutions is transferred by the air inside the cases 1 and 2 and the cases 1 and 2, and the heat is dissipated to the cover 6 by the cooling pillow 20 and the disk motor. 12, the electronic device, the laser diode of the optical head, etc. are cooled.

Next, FIG. 5 will be described below as a fifth embodiment.

In the figure, the same parts as those in the previous section are designated by the same reference numerals. The inner side surface of the cover 6 and the upper surface of the case 1 are fixed in contact with each other by a screw 22, and a viscous body 23 may be applied to improve the contact. Cases 1 and 2 are made of copper, aluminum, or iron, which has a particularly high heat transfer coefficient, as a part or all of them, and similarly to the above, the heat of the disk motor 12 and the rotational speed control electronic element is the case. The air and case inside the boots 1 and 2
The heat is transmitted to the cover 6 by the spaces 1 and 2, and the heat is dissipated, and the disk motor 12, the electronic element, the laser diode of the optical head, etc. are cooled.

Next, FIG. 6 will be described below as a sixth embodiment.

In the figure, the same parts as those in the previous part are designated by the same reference numerals, 24 is an electronic element for controlling the number of revolutions of the disk motor 12, 25 is a lead wire, and 26 is another heat radiating plate. . The operation of the optical disk device having the above configuration will be described below.

The rotation speed control electronic element 24 of the disk motor 12 is connected to the disk motor 12 by a lead wire 25 and is fixed to the printed circuit board 4 outside the cases 1 and 2, so that the heat radiation is eliminated. Is performed more sufficiently than in the cases 1 and 2, and also has an effect of suppressing the temperature in the cases 1 and 2. Further, since the optical head exists in the cases 1 and 2, it is possible to prevent dust from entering. Further, it goes without saying that the sixth embodiment may be applied to the optical disk device shown in the first to fifth embodiments.

[0023]

According to the present invention, since the insertion / ejection port is closed by the lid except when the disc is inserted / ejected and the inside of the case is substantially sealed, the disc insertion / ejection mechanism, the disc rotation motor, and A case for housing the optical head drive mechanism, etc.
It is possible to reduce the intrusion of dust into the space and improve the dustproof function.

Further, according to the present invention, the heat input portion of the heat pipe for radiating heat by utilizing latent heat due to condensation of liquid is brought into contact with the upper surface or the lower surface of the case or near the lower portion of the disk motor. Therefore, the heat generated from this part is radiated from the heat radiating part, and the temperature of the electronic element for controlling the rotation speed of the disk motor and the parts inside the case are kept within the performance guarantee temperature range with the inside of the case sealed. This can be suppressed and the life of the optical disk device can be extended. In addition,
Since the electronic element for controlling the rotational speed of the tor is taken out of the case, the temperature inside the case can be further suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of a disk device of the present invention.

FIG. 2 is a sectional view of a second embodiment of the disk device of the present invention.

FIG. 3 is a sectional view of a third embodiment of the disk device of the present invention.

FIG. 4 is a sectional view of a disk device according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a disk device according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view of a disk device according to a sixth embodiment of the present invention.

[Explanation of symbols]

 1. Case, 2. Case, 3. Power supply, 4. Printed circuit board, 5. Chassis, 6. Cover, 7. Front panel, 8. First lid, 9. Second lid, 10. Disk, 11. Turntable, 12. Disc motor, 13. Unit mechanism, 14． Heat pipe, 14a. Heat input part of heat pipe, 14b. Heatsink of heat pipe, 15. Heat dissipation fin, 16. Metal piece, 17. Rubber or spring, 18. Thin sheet material, 19. Inert liquid, 20. Cooling pillow, 21. Angle, 22. Screws, 23. Viscous body, 24. Electronic device for controlling rotation speed of disk motor, 25. Lead wire, 26. Heat sink,

Claims (5)

[Claims] 1. A turntable for rotating a disc,
In an information device configured by connecting a disk device used as a storage device to a personal computer used as a host computer, which has a head for recording and reproducing information on the disk, recording the disk in the disk device. Then, a disc insertion / ejection mechanism having a function of locating on the reproducing means and a function of ejecting to the outside of the disc device, a head drive mechanism for moving the head to a designated track position in the radial direction of the disc, and the disc A drive unit, which is formed by assembling a unit mechanism composed of a rotating disk motor, is supported by a viscoelastic body or an elastic body, and the drive unit is sealed with a lid for opening and closing a disk insertion / exhaust port and a case made of a metal or plastic material. Connect the power supply of the device to the rear of the case or Parts provided above or upper part, along with dissipating drilled blind hole in the housing to cover the periphery of the disk device of the periphery of the power supply unit if necessary, heat -
A disk device, characterized in that the heat input part of the heat pipe is brought into contact with the upper surface or the lower surface of the case, or near the lower part of the disk motor. 2. The apparatus according to claim 1, wherein instead of the heat pipe, the upper surface of the case and the inner side surface of the cover of the disk device contain hydrogen and chlorine such as perfluorocarbon liquid. A disk device characterized in that an upper surface and a lower surface of a flat cooling pillow having a thickness in which a fluorine-based inert liquid is sealed with a thin material are brought into contact with each other. 3. The apparatus according to claim 1, wherein instead of said heat pipe, part or all of said case is made of an aluminum material having good thermal conductivity, copper or iron, and the upper surface of said case. And an inner surface of a cover of the optical disk device abutting against each other. 4. A turntable for rotating a disc,
In an information device configured by connecting a disk device used as a storage device to a personal computer used as a host computer, which has a head for recording and reproducing information on the disk, recording the disk in the disk device. Then, a disc insertion / ejection mechanism having a function of locating on the reproducing means and a function of ejecting to the outside of the disc device, a head drive mechanism for moving the head to a designated track position in the radial direction of the disc, and the disc A drive unit, which is formed by assembling a unit mechanism composed of a rotating disk motor, is supported by a viscoelastic body or an elastic body, and the drive unit is sealed with a lid for opening and closing a disk insertion / exhaust port and a case made of a metal or plastic material. Connect the power supply of the device to the rear of the case or Parts provided above or upper part, along with dissipating drilled blind hole in the housing to cover the periphery of the disk device of the periphery of the power supply unit if necessary, the Disukumo - the torque of the rotational speed control for electronic devices, said Ke -
A disk device characterized in that it is pulled out to the outside of the case by a lead wire or the like and provided on a printed circuit board outside the case, and if necessary, radiation fins are provided and fixed to the electronic element for controlling the number of revolutions. 5. The apparatus according to claim 1, 2 or 3, wherein the electronic element for controlling the rotation speed of the disk motor is pulled out to the outside of the case by a lead wire or the like and is attached to a printed circuit board outside the case. A disk device characterized in that a radiation fin is provided and fixed if necessary.