JP2010055662A - Disk device and video recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk device wherein capable of air-cooling and dust-proofing the inside of a disk device body without using a dust collection filter. <P>SOLUTION: The disk device housing an optical pickup 24 for reproducing or recording information of a disk 7 in a casing has: a dust preventing space isolating the optical disk 7 and the optical pickup 24 to be a heat generating source to perform dust prevention; a mechanism base 16 partitioning the casing; and air cooling cylinders 35a and 35b penetrating the casing so that air can be made to flow and cooling the mechanism base 16. The air cooling cylinders 35a and 35b have at either part or both parts of one end part and the other end part, opening and closing plates 36a and 36b deformed by temperature change and opening and closing the air cooling cylinders 35a and 35b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a disk device that reproduces or records information on a disk, and a recording / reproducing apparatus including the disk device.

  2. Description of the Related Art Conventionally, disk devices that record or reproduce information on a disk that is a disk-shaped recording medium have been used. In an optical disk apparatus that uses laser light for recording and reproducing information, a spindle motor that rotates an optical disk chucked on a turntable, and the laser light is focused on the recording surface of the optical disk and horizontally moved to an arbitrary track on the optical disk. And an optical pickup. The optical pickup has an actuator that moves the objective lens up and down, left and right, and always focuses the light spot at a desired position on the optical disk.

In recent years, the recording density of optical discs has been rapidly increasing, and high-speed recording has been increasingly advanced. For this reason, the semiconductor laser that is the light source of the optical pickup needs to be controlled with higher power.
The drive LSI that drives the semiconductor laser creates a steep reflected light amount at the recorded / unrecorded edge of the optical disk with a miniaturized light spot, and performs write strategy control that switches the laser power at high speed within about 1 nanosecond during recording. Yes.

In order to avoid the influence of stray capacitance as much as possible, the driving LSI that performs such high-speed switching control needs to be arranged in the vicinity of the semiconductor laser. However, the driving LSI that drives the semiconductor laser generates heat, and the nearby laser stem Increase temperature.
Furthermore, there is a digital or analog LSI for high-speed processing mounted on a circuit board as a heat source of the optical disk device, which further raises the temperature of the atmosphere inside the housing.

  In general, semiconductor lasers are vulnerable to high temperatures, and there are several times the life difference between a normal temperature atmosphere and a high temperature atmosphere of 60 ° C. When the laser power of the optical disk device is low power during reproduction, the life of the semiconductor laser is hardly affected, but there is a life difference of several times or more between high power during recording and low power during reproduction.

  Further, the dust that adheres to the optical disk as the light spot becomes finer adversely affects the recording and reproduction of the optical disk device, and the reliability of the data is impaired.

There are the following proposals for this type of optical disk apparatus.
In the example shown in Patent Document 1, an air circulation path is formed in an optical disc apparatus provided with a fan via a duct, and air passing through a dust collection filter is circulated to cool the air while minimizing dust.

In the example shown in Patent Document 2, the inside of the optical disk apparatus is divided into a mechanical part such as an optical pickup and a spindle motor sealed with a partition plate, and a circuit part for driving the mechanical part.
Furthermore, in Patent Document 2, a fan is provided at the rear part of the optical disk device, and a hole for air intake is provided at the front part of the device. Air is introduced into the circuit unit side from the air intake hole by the fan and air-cooled. Dust-proofing of mechanical parts such as optical pickups is achieved by sealing with a partition plate.

In the example shown in Patent Document 3, a fan that allows air to flow into the optical disk device from the opening and a guide plate that adjusts the amount and direction of air flowing from the opening according to a temperature change in the optical disk device. The air cooling inside the device and the dust prevention are achieved.
JP-A-8-102180 JP 2000-348481 A JP 2006-79720 A

  However, in the example shown in the conventional patent document 1, since the air is cooled by the air passing through the dust collection filter, the dust collection filter needs to be replaced when the dust collection filter is clogged. In many cases, it is not known when to replace the dust collecting filter, and it is complicated for the user to replace the dust collecting filter.

In the example shown in Patent Document 2, in the case of a semiconductor laser controlled with high power, it is difficult to suppress the temperature rise of the semiconductor laser because the optical pickup including the semiconductor laser is in a sealed space. There is room for improvement in extending the life of semiconductor lasers.
In the examples shown in Patent Documents 1 to 3, since the optical disk device itself is provided with an air cooling fan, and a fan operation noise is generated, there is room for improvement in achieving noise reduction.

  By the way, a sealed structure is desirable for dust prevention, but air cooling is not possible with a sealed structure, and in the case of air cooling with a fan, the air cooling effect increases, but dust easily enters and a dust collection filter is required. There is nothing suitable for satisfying the contradictory functions of air cooling and dust prevention, and improvements are required.

  Therefore, in an optical disk apparatus, in order to realize a highly reliable recording / reproducing operation without using a dust collecting filter, the semiconductor laser has a long lifetime, and the sealing inside the housing of the optical disk apparatus is increased. The problem to be solved is how to keep the internal temperature of the housing near room temperature.

  The present invention has been made in view of such circumstances, and an object of the present invention is to form a dust-proof space for dust-proofing the disk and the optical pickup by a partition body that partitions the disk device main body. It is an object of the present invention to provide a disc device and a recording / playback device that can cool and prevent dust inside the disc device main body without using a dust collection filter.

  The disc device of the present invention is a disc device provided with an optical pickup for reproducing information recorded on the disc or recording information in the housing, and the dust compartment is partitioned to protect the disc and the optical pickup from dust. In the casing, and an air-cooled cylinder that allows air to pass through the casing and cools the partition.

In the disk device of the present invention having such a configuration, the disk and the optical pickup are isolated in a dust-proof space to be dust-proof. When air flows into the air-cooled cylinder, the flow-in air cools the partition that partitions the housing, and the temperature of the dust-proof space formed by the partition that partitions the housing is lowered.
Therefore, in the disk apparatus of the present invention, the housing is protected from dust without using a dust collecting filter, and the inside of the housing is air-cooled.

  The disk device according to the present invention is characterized in that an opening degree variable portion is provided at an end of the air-cooled cylinder to change the opening degree of the air-cooled cylinder by being deformed with a temperature change.

In the disk apparatus of the present invention having such a configuration, heat from the optical pickup or the like in the dustproof space is transferred to the partition body and the air cooling cylinder, and the temperature of the opening variable portion of the air cooling cylinder changes. The opening variable part is deformed with temperature change to change the opening of the air-cooled cylinder, and the amount of air flowing into the air-cooled cylinder is increased or decreased.
For example, if the opening of the air-cooled cylinder is widened by deformation due to the high temperature of the opening variable part, when the temperature of the opening variable part becomes high due to heat transfer, the opening of the air-cooled cylinder increases, The amount of air flowing in increases, and the air cooling effect is enhanced corresponding to the temperature due to heat transfer from a heat source such as an optical pickup.

  The disk device according to the present invention is characterized in that the air cooling cylinder is formed integrally with the partition.

  In the disk device of the present invention having such a configuration, heat from the optical pickup or the like in the dust-proof space is quickly transmitted to the air-cooled cylinder, and the thermal response of the opening variable portion of the air-cooled cylinder is accelerated. When air flows into the air-cooled cylinder, the air that flows in cools the peripheral surface of the air-cooled cylinder that is integral with the partition, and the cooling effect of the partition is enhanced.

  In the disk device of the present invention, either or both of the partition body and the air-cooled cylinder have a large number of fine holes that allow the air-cooled cylinder to communicate with the dust-proof space.

In the disk apparatus of the present invention having such a configuration, the dust-proof space becomes an imperfect substantially sealed space due to a large number of fine holes communicating with the air-cooled cylinder. However, when a heat source such as an optical pickup is generating heat, the dust sealed space is substantially sealed. Since the air pressure in the space is positive, dust does not enter, and the substantially sealed space is a dust-proof space where dust does not enter.
When air is flowing into the air-cooled cylinder, the inside of the air-cooled cylinder is negative due to the dynamic pressure of the air, and warm air in the positive pressure dustproof space flows into the negative-pressure air-cooled cylinder from the fine holes. The air-cooled cylinder into which air is flowing effectively lowers the temperature of the dust-proof space by exhausting hot air from the dust-proof space and cooling the partition.

  In the disk device of the present invention, the air-cooled cylinder has a large number of fine holes on the peripheral surface.

  In the disk device of the present invention having such a configuration, when air flows into the air-cooled cylinder, the inside of the air-cooled cylinder is negative due to the dynamic pressure of the air, and the warm air and the outside air in the dust-proof space are fine. It flows into the air-cooled cylinder from the hole. The air-cooled cylinder into which air flows in effectively cools the dust-proof space by exhausting warm air from the dust-proof space and cooling the partition.

  The disk device according to the present invention is characterized in that the partition and the air-cooled cylinder are made of a member having a higher thermal conductivity than the casing.

  In the disk device of the present invention having such a structure, the partition body and the air cooling cylinder have higher thermal conductivity than the housing, so that the heat transfer efficiency in the dustproof space is good, and the dustproof space having the heat source inside is cooled quickly. To do.

  The disk device of the present invention is characterized in that a heat generating source is provided in the dust-proof space, and the air-cooled cylinder is formed to be narrower than an end portion of the air-cooled cylinder in the vicinity of the heat generating source.

  In the disk apparatus of the present invention having such a configuration, when air flows into the air-cooled cylinder, the flow velocity is increased in the narrow passage of the air-cooled cylinder, the air-cooling efficiency is increased, and the dust-proof space having the heat source is effectively cooled.

  The disk device of the present invention is characterized in that a heat radiating fin is formed on the inner surface of the air-cooled cylinder.

  In the disk device of the present invention having such a configuration, when air flows into the air-cooled cylinder, the heat radiating fins increase the heat radiation to the air flowing through the air-cooled cylinder, improving the heat transfer efficiency and increasing the air-cooling effect.

  The disk device of the present invention is characterized in that the opening degree of the opening degree variable part is variable due to the temperature dependence of the bimetal or shape memory alloy.

In the disk apparatus of the present invention having such a configuration, the opening degree varying unit changes the opening degree of the air-cooled cylinder due to the temperature dependence of the bimetal and the shape memory alloy.
Therefore, the disk device of the present invention does not require a drive mechanism such as a motor for driving the opening degree varying unit.

  The disk device according to the present invention is characterized in that the opening degree varying portion is deformed to the outside or the inside of the air-cooled cylinder by a temperature change.

  In the disk device of the present invention having such a configuration, it becomes possible to cope with the use environment in consideration of the clearance.

  In the disk device according to the present invention, the opening degree varying portion has a plate shape that closes an end portion of the air-cooling cylinder, and the air-cooling is performed from a deforming portion that is curved and deformed as the temperature rises, and a part of the deforming portion. It protrudes in the side part side of a pipe | tube, and has the attachment part contact | connected by the edge part vicinity of the said air-cooling cylinder.

  In the disk device of the present invention having such a configuration, for example, at room temperature, the deformable portion of the opening variable portion can close the end of the air-cooled cylinder, and the attachment portion and the deformable portion of the attachment portion and the deformable portion by heat transfer from the heat source As the temperature rises, the deformed portion curves and the opening of the air-cooled cylinder changes. Depending on the opening of the air-cooled cylinder, the air flow rate is increased and decreased to effectively cool the dust-proof space.

  The recording / reproducing apparatus of the present invention is a recording / reproducing apparatus comprising a case, an exhaust fan for exhausting air in the case, and the above-described disk device, wherein the air-cooled cylinder is made negative pressure by exhaust of the exhaust fan. It is characterized by being.

  In the recording / playback apparatus of the present invention having such a configuration, the disk apparatus can be air-cooled and dust-proof without using a dust collection filter.

In the disk device of the present invention, the dust-proof space for dust-proofing the disk and the optical pickup is formed by a partition body that partitions the disk device body, and the partition body is air-cooled. It has the effect that the inside can be air-cooled and dust-proof. Furthermore, since the disk device main body is not provided with an air cooling fan, noise reduction can be achieved.
Since the recording / playback apparatus of the present invention includes the exhaust fan and the above-described disk device, it has an effect that the inside of the disk device body can be air-cooled and dust-proof without using a dust collecting filter.

  Hereinafter, preferred embodiments of a disk device and a recording / playback device according to the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view showing a recording / reproducing apparatus in which a disk apparatus according to Embodiment 1 of the present invention is housed.
The disc apparatus according to Embodiment 1 can record and reproduce information such as a compact disc (CD), a digital video disc (DVD), and a Blu-ray disc (BD) which are disc-shaped recording media.
The disk device includes not only one having a recording / reproducing function but also one having only a reproducing function. In this case, the recording / reproducing device is a reproducing device such as a CD drive or a DVD drive.

The recording / playback apparatus 1 houses a BD disk device 8 and a hard disk device (not shown) in a casing 2 which is a flat rectangular parallelepiped case, and the disk device 8 has an air cooling and dustproof structure. 50.
In the air-cooling and dust-proof structure 50 of the disk device 8, the air-cooling cylinders 35 a and 35 b that form air flow paths capable of air-cooling and dust-proofing are provided at one end portions of the air-cooling cylinders 35 a and 35 b, respectively, and warping occurs due to temperature Open / close plates 36a and 36b, which are temperature-dependent deformable members. The opening / closing plates 36a and 36b are opening degree variable portions that change the opening degree of the air cooling cylinders 35a and 35b by deforming the temperature, and adjust the flow rate of air in the respective air cooling cylinders 35a and 35b.

A rectangular opening 2a is formed in the longitudinal direction of the front panel 4a of the housing 2 of the recording / playback apparatus 1, and the front surface 14 of the disk device 8 is exposed to the outside from the opening 2a. An exhaust port 3 is formed in the rear panel 4 b of the housing 2, and an exhaust fan 6 is provided in the housing 2 so as to face the periphery of the exhaust port 3.
The exhaust fan 6 releases heat generated in the disk device 8 from the exhaust port 3 to the outside along with heat from the power source and the like generated in the housing 2.

  The exhaust fan 6 is controlled by a state of an opening / closing plate 36b that opens and closes based on a temperature change, and a temperature sensor 6a for controlling the exhaust fan 6 is attached in the vicinity of the opening / closing plate 36b.

The recording / playback apparatus 1 is provided with a side, a disk change-over switch 5a, and a hard disk change-over switch 5b at a substantially central portion of the front panel 4a. In the recording / playback apparatus 1, information on a disc 7 such as a BD is recorded on a hard disk. For example, information recorded on the hard disk can be dubbed to a DVD by switching from BD to DVD.
Near one end of the front panel 4a, a power switch 5c and a remote control receiver 5d are provided.

2 is a perspective view showing the inside of the disk device according to Embodiment 1, FIG. 3 is a perspective view showing the housing structure of the disk device, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. .
The disk device 8 contains a tray 12 that holds the disk 7 and moves it into the disk device body. The disk device 8 has a flat rectangular parallelepiped housing 9, and an opening 10 a is formed in the front portion of the housing 9. A rectangular frame-like bezel 10b is fitted into the opening 10a, and the tray 12 can enter and exit from the opening 10c of the bezel 10b.

The tray 12 has a rectangular trapezoidal shape, and a disc-like disk 7 can be placed substantially horizontally at a substantially central portion in the longitudinal direction.
The front surface portion 13 of the tray 12 has a rectangular shape in front view, and the front surface portion 13 is provided with an eject button 13a and an indicator 13b. When the tray 12 is accommodated in the housing 9, when the eject button 13a is pressed, the indicator 13b blinks, the driving mechanism (not shown) is activated, and the tray 12 moves from the housing 9 to the outside. Turns off.

  When the front surface portion 13 of the tray 12 is pushed to the inside of the housing 9, the indicator 13 b blinks, the drive mechanism reversely operates, the tray 12 moves into the housing 9, and the indicator 13 b is turned off. It has become.

A channel-shaped mechanism base 16 that is a partition is attached to the housing 9 so as to partition the housing 9 from the front side to the rear side of the housing 9. The mechanism base 16 is open on the front side and the rear side. The mechanism base 16 is provided with a mechanism section such as a spindle motor 18 and a carriage 22, and the mechanism base 16 serves as a support base for the mechanism section.
The mechanism base 16 transfers heat from a heat source such as the semiconductor laser 26a inside the housing 9 to enhance the heat dissipation effect. Therefore, the mechanism base 16 has a higher thermal conductivity than the housing 9, that is, a material with good thermal conductivity. It is formed with.
Examples of the material having high thermal conductivity include silver, copper, gold, aluminum, and graphite, but copper or an alloy containing copper is preferable in terms of cost.

A spindle motor 18 is provided at substantially the center of the upper surface of the mechanism base 16. A disc-shaped turntable 19 is fixed to the tip of the rotating shaft of the spindle motor 18. The turntable 19 is provided so that the disk-like disk 7 is placed flat and the recording surface faces downward.
A carriage 22 for moving the optical pickup 24 in the radial direction of the disk 7 is provided so as to reciprocate back and forth with respect to the turntable 19 that chucks the disk 7.
The carriage 22 is supported by two parallel guide shafts 20a and 20b provided from the rear side to the front side in the disk device main body of the mechanism base 16.

  The carriage 22 includes a screwing portion 21a that is screwed into the screw shaft 21 on the outer side of one guide shaft 20a. The screw shaft 21 is disposed to face the vicinity of one guide shaft 20a. The screw shaft 21 is coupled coaxially with the rotating shaft of the servo motor 21b.

The screw shaft 21 is rotated by the rotation drive of the servo motor 21b. In conjunction with the rotation of the screw shaft 21, the screwing portion 21a moves along the screw shaft 21, and the carriage 22 moves to the guide shafts 20a and 20b. Guided.
The carriage 22 faces the recording surface of the disk 7 and reciprocates horizontally in the radial direction of the disk 7.

  On the upper surface of the carriage 22, an optical pickup 24 for recording and reproducing information on the disk 7 is provided. The optical pickup 24 has an actuator 24 b that moves the objective lens 24 a up, down, left, and right to always focus the light spot at a desired position on the disk 7. Further, the optical pickup 24 includes a laser stem 26 including a semiconductor laser 26a that irradiates the recording surface of the disk 7 with a laser beam, and a photodetector (not shown) that collects the laser beam reflected from the recording surface of the disk 7. An optical system is provided.

In the vicinity of the laser stem 26, a drive LSI 28 for driving the semiconductor laser 26a is disposed. The laser stem 26 and the drive LSI 28 are mounted on a substrate 29, and the substrate 29 is attached to the carriage 22 via a heat transfer sheet 30 to enhance heat dissipation.
The carriage 22 is made of, for example, copper or aluminum having a high thermal conductivity, and efficiently transmits heat from the semiconductor laser 26a or the like so as to increase heat dissipation of the heat source.

  The control circuit of the disk device such as the spindle motor 18 and the carriage 22 is mounted on a circuit board (not shown), and the circuit board is mounted on the lower surface of the mechanism base 16 via an insulating heat transfer sheet (not shown). Is provided.

As shown in FIG. 3, the housing 9 is composed of an upper housing 9a having a lid-like box whose front side is opened and a lower housing 9b having a lid-like box having its front side opened. The upper housing 9a is fitted to the lower housing 9b in a lid shape, and both opened front sides form an opening 10a.
Guide grooves 17a and 17b for supporting and guiding both sides of the tray 12 are formed from the vicinity of the opening 10a of the upper housing 9a to the back side.
The above-described mechanism base 16 is in close contact with the lower housing 9b.

On the lower surface of the mechanism base 16, two channels 32 a and 32 b having a U-shaped side sectional view are attached to form a cylindrical body together with the lower surface of the mechanism base 16 from the front side of the lower housing 9 b to the rear wall 9 c side. ing.
Two rectangular openings 11a and 11b are formed in the rear wall 9c of the lower housing 9b. The rear end 33a of the channel 32a abuts on the periphery of the opening 11a, and on the periphery of the opening 11b. The rear end 33b of the channel 32b is in contact.

  Air cooling cylinders 35a and 35b are formed by the mechanism base 16 and the respective channels 32a and 32b. That is, the air cooling cylinders 35 a and 35 b are formed integrally with the mechanism base 16. The air-cooling cylinders 35a and 35b have two straight tubes, and each form an air flow passage.

The channels 32 a and 32 b are made of a material having a higher thermal conductivity than the housing 9. The material may be the same material as that of the mechanism base 16, for example, copper is preferable.
The members forming the air-cooled cylinders 35a and 35b may be square pipes, semicircular pipes, and semi-elliptical pipes instead of the channels 32a and 32b, and are in close contact with the lower surface of the mechanism base 16 so that the contact area is maximized. You can attach it.

  Front end portions 34a and 34b of the two channels 32a and 32b, that is, front end portions of the air-cooling cylinders 35a and 35b, are provided with opening / closing plates 36a and 36b having a rectangular shape in front view that form a door that closes the front end portions. . The open / close plates 36a and 36b are formed of bimetal, and can be opened and closed by changing the opening degree by changing the temperature according to the temperature change (see the black arrow in FIG. 3, details will be described later).

The rear ends 33a and 33b of the two channels 32a and 32b are opened through the openings 11a and 11b of the rear wall 9c, and air having a flow rate corresponding to the opening degree of the opening and closing plates 36a and 36b circulates. It is like that.
In FIG. 3, reference numerals 37 a and 37 b indicate attachment portions of the open / close plates 36 a and 36 b, and reference numeral 38 indicates a screw.

  As shown in FIG. 4, the mechanism base 16 seals and isolates the disk 7 and the mechanism parts such as the spindle motor 18 and the optical pickup 24 together with the upper housing 9 a and the front surface part 13 of the tray 12 to prevent dust. A sealed space, that is, a dust-proof space 15 is formed. That is, the mechanism base 16 includes an air cooling cylinder 35a, 35b formed by two channels 32a, 32b and the lower surface of the mechanism base 16, and a lower housing from a space including the disk 7 and a mechanism section such as the spindle motor 18. It is made to be a sealable structure that isolates the space of the body 9b.

  The lower housing 9b accommodates members such as a motor for driving the tray 12, a drive gear, and a control circuit board (not shown), and the air cooling cylinders 35a and 35b are provided avoiding these members. .

5 is a cross-sectional view taken along the line VV of FIG. 2 showing the opening / closing plate of the disk device, and FIG. 6 is a perspective view showing a modification of the opening / closing plate.
The opening / closing plate 36 (36 a, 36 b) has a reverse L-shape when viewed from the side, and extends downward from a rectangular contact portion 37 (37 a, 37 b) that protrudes sideways and one end of the contact portion 37. It consists of a rectangular deformation part 39 (39a, 39b).
The contact portion 37 protrudes to the mechanism base 16 side, that is, the side of the air-cooled cylinder 35, and is formed on the upper surface of the mechanism base 16 by screws 38 or spot welding, that is, the end of the air-cooled cylinder 35 (35a, 35b). It is attached in the vicinity with good thermal contact.

  The deforming portion 39 has a plate shape that closes the end of the air-cooled cylinder 35, and is formed of a bimetal that curves and deforms outward as the temperature rises. The deformable portion 39 is formed by bonding two kinds of thin metal plates having different thermal expansion coefficients, and the metal plate on the back side of the deformable portion 39 is made of a metal having a higher coefficient of thermal expansion than the metal plate on the front side.

The opening / closing plate 36 is closed at room temperature, opens as the temperature gradually rises above room temperature, and is fully opened at least when the temperature around the disk device exceeds about 35 ° C.
Further, the opening / closing plate 36 is closed when the temperature is close to room temperature, and is fully closed when the temperature around the disk device is about 20 ° C. or less, for example (see the black arrow in FIG. 5).

  Air flows into the air cooling cylinders 35 (35a, 35b) formed by the channels 32 (32a, 32b) and the lower surface of the mechanism base 16 in accordance with the opening degree of the opening / closing plate 36 (FIG. (See white arrow 5).

The opening / closing plate 36 is made of a deformable member having temperature dependency, and may be a bimetal as long as it is a member that is deformed with temperature dependency and is opened / closed by changing the opening degree.
In the opening / closing plate 40 of the modified example shown in FIG. 6, a wire made of a shape memory alloy is used so as to be temperature-dependent and capable of opening / closing the opening / closing plate 40 main body. That is, the opening / closing plate 40 has a rectangular and elastically deformable door 42 that can close the front end 34 of the channel 32, and two inverted L-shaped wires 44 and 44 made of a shape memory alloy. Each of the wires 44, 44 is embedded in the vertical direction on both sides of the door 42 from the curved portion 44 a to the one end portion 44 b. From the vicinity of the curved portion 44a of each of the wires 44 and 44 to the other end portion 44c are fixed to the upper surface of the mechanism base 16 by metal fittings 46 and 46 with good thermal contact.

  Further, the opening / closing plate 40 opens the front end portion 34 of the channel 32 as the temperature gradually rises above the normal temperature based on the temperature dependence of the shape memory alloy wires 44, 44. Is closed (see arrow E in FIG. 6).

  In addition, although the wire 44 which consists of a shape memory alloy was utilized as a modification, you may make it open and close to a door shape using a plate-shaped shape memory alloy.

Next, the operation of the disk device 8 according to the first embodiment will be described together with the air cooling and dust prevention method in the disk device 8.
1 and 2, first, when the power switch 5c of the recording / reproducing apparatus 1 is turned on, the exhaust fan 6 operates at a low speed. When the exhaust fan 6 operates at a low speed, the air in the housing 2 is exhausted from the exhaust port 3.

When the temperature of the opening / closing plate 36b of the disk device 8 is equal to or lower than a specified value (normal temperature) after a predetermined time has elapsed, the exhaust fan 6 stops or maintains low-speed rotation in accordance with the temperature detected by the temperature sensor 6a. If it is greater than the specified value, the exhaust fan 6 rotates normally.
When the eject button 13a of the disk device 8 is pressed, the indicator 13b blinks, the tray 12 moves outward from the disk device body, and the indicator 13b is turned off.

After the disk 7 is placed flat on the tray 12, when the front surface portion 13 of the tray 12 is pushed to the inside of the disk device body, the indicator 13b blinks, the tray 12 moves into the disk device body, and the indicator 13b is turned off. To do.
When the indicator 13b is extinguished, the exhaust fan 6 is operated to perform normal rotation, or from low-speed rotation to normal rotation, and heat is exhausted.

The tray 12 that has moved into the disk device main body is a sealed space that seals the disk 7 and the mechanism portions such as the spindle motor 18 and the optical pickup 24 together with the upper housing 9a and the mechanism base 16 by the front surface portion 13 of the tray 12. A certain dustproof space 15 is formed (the process of forming the dustproof space).
Inflow of outside air into the dust-proof space 15 is blocked, so that dust does not enter the dust-proof space 15.

  Next, for example, when the playback button is turned on with a remote control switch (not shown), the spindle motor 18 rotates and the carriage 22 transports the optical pickup 24 to a predetermined position on the lower surface of the disk 7. The optical pickup 24 focuses the semiconductor laser 26 a of the laser stem 26 on the recording surface of the disk 7 and reads information on the disk 7. The disk device 8 reproduces the information read by the optical pickup 24 and displays it on a display (not shown).

  Heat generated by the rotational drive of the spindle motor 18, heat generated by the write strategy control of the semiconductor laser 26a of the laser stem 26, etc. are generated in the disk device body (heat generation process), and the heat generated by these heat sources is transferred by convection. As a result, the temperature of the air inside the disk device body rises (the heat transfer process from the heat source to the air).

  Next, the heat inside the dust-proof space 15 sealed in the disk device main body, in other words, the upper housing 9a, the front surface portion 13 of the tray 12, and the mechanism base 16 is in contact with the air (warm air). Heat is transferred to 16 by convection (heat transfer process from hot air to mechanism base 16).

Then, the temperature of the open / close plates 36a, 36b rises due to heat conduction to the contact portions 37a, 37b of the channels 32a, 32b and the open / close plates 36a, 36b that are in thermal contact with the mechanism base 16.
Since the mechanism base 16 that forms the dust-proof space 15 has high thermal conductivity, heat is transmitted quickly, and the temperatures of the open / close plates 36a and 36b change rapidly. Further, the heat from the installation surface of the spindle motor 18 and the heat of the hot air are efficiently conducted from the high temperature portion to the low temperature portion of the mechanism base 16 (heat transfer process by heat conduction of the mechanism base 16).

Next, when the temperature of the bimetal opening and closing plates 36a and 36b rises, the opening and closing plates 36a and 36b bend outward from the closed state in response to the temperature change due to the difference in thermal expansion coefficient between the two types of metal thin plates. Then, the opening degree is changed and air is opened, and air flows into the air cooling cylinders 35a and 35b. When the temperature of the opening / closing plates 36a, 36b decreases, the bending of the opening / closing plates 36a, 36b returns to the inside in response to the temperature change.
The flow rate of the air flowing into the air-cooling cylinders 35a and 35b is increased or decreased in accordance with the opening degree of the opening and closing plates 36a and 36b that are deformed according to the temperature change (flow rate adjusting process by the opening and closing plates).

  The air flowing into the air-cooling cylinders 35a and 35b is in thermal contact with the lower surface of the mechanism base 16 forming the air-cooling cylinders 35a and 35b and the peripheral surfaces of the channels 32a and 32b. The mechanism base 16 is cooled. When the air cooling cylinders 35a and 35b through which air flows cools the mechanism base 16, the temperature of the dust-proof space 15 partitioned by the mechanism base 16 decreases (air cooling process).

  The air flowing into the air-cooling cylinders 35a and 35b becomes warm air by heat transfer from the peripheral surfaces of the air-cooling cylinders 35a and 35b, and passes through the openings 11a and 11b of the lower housing 9b of the disk device 8 (see FIG. 2). For example, the exhaust fan 6 of the recording / playback apparatus 1 forcibly exhausts heat from the exhaust port 3 (thermal exhaust process).

  Thus, in the disk device according to the first embodiment, the dust-proof space 15 that isolates the disk 7 and the optical pickup 24 and the like from the outside air is formed in the disk device main body, and the dust-proof space 15 is air-cooled. The inside can be protected against dust and air. Further, since the stop, low speed rotation and normal rotation of the exhaust fan 6 are controlled in accordance with the temperature of the dustproof space 15, that is, the temperature of the open / close plate 36b of the air cooling cylinder 35b, power saving can be realized.

  Therefore, in the first embodiment, since dust that can adhere to the disk 7 is prevented from entering, even when a fine light spot such as a BD is used, a read / write error due to the dust adhesion on the disk 7 occurs. There is nothing to do. Moreover, the temperature rise of the semiconductor laser 26a can be suppressed by air cooling, and the lifetime of the semiconductor laser 26a can be extended.

  In the first embodiment, an example in which two straight tubular air-cooling cylinders 35a and 35b are provided has been described. However, one or more air-cooling pipes are formed so as not to be reversed from the front side of the lower housing 9b to the rear wall 9c. The cylinder may be provided at an appropriate position.

Depending on the usage environment of the disk device, the opening / closing plates 36a and 36b may be omitted.
When the opening / closing plates 36a and 36b are not provided, it is preferable to operate the exhaust fan 6 of the recording / playback apparatus 1 when the disk device is driven.
The temperature sensor 6a may be attached to an appropriate position of the mechanism base 16.

  When driving a disk device without the open / close plates 36a, 36b, when the exhaust fan 6 is on / off controlled according to the temperature change of the temperature sensor 6a, for example, the air cooling is linked to the on / off of the exhaust fan 6. The dust-proof space 15 can be air-cooled by increasing or decreasing the flow rate of the air flowing into the tubes 35a and 35b and air-cooling the peripheral surfaces of the air-cooling tubes 35a and 35b.

(Embodiment 2)
Next, a second embodiment will be described.
The air-cooled cylinder in the disk device according to the second embodiment is such that a net-like fine hole is formed in the peripheral surface of the air-cooled cylinders 35a and 35b in the first embodiment, and other configurations other than the air-cooled cylinder are substantially implemented. This is the same as the first embodiment.

FIG. 7 is a perspective view showing an air-cooled cylinder according to the second embodiment.
Note that members that are substantially the same as or corresponding to those in the first embodiment are denoted by the same reference numerals, and redundant detailed description and operational effects are omitted as appropriate. The same applies to other embodiments below. To do.
In the second embodiment, the two channels 52 a and 52 b form a cylindrical body together with the lower surface of the mechanism base 56 on the lower surface of the mechanism base 56 from the front side of the lower housing 9 b to the openings 11 a and 11 b of the rear wall 9 c. It is attached as follows.

  Air cooling cylinders 55a and 55b are formed by the mechanism base 56 and the respective channels 52a and 52b. The air-cooled tubes 55a and 55b have a straight tube shape, and each form an air flow passage.

A large number of fine holes 58a and 58b of several hundred μm or less are formed on the peripheral surfaces of the air-cooling cylinders 55a and 55b according to the second embodiment, and have a net shape.
In the mechanism base 56 that forms the dust-proof space 15 of the second embodiment, the net-like fine holes 58a and 58b are formed, so that the dust-proof space 15 is a substantially sealed space. Due to the heat generated by the heat generation source, the inside of the substantially sealed space becomes a positive pressure and dust does not enter, so the dustproof function of the dustproof space 15 is maintained even in the substantially sealed space.

The minimum diameter of the fine holes 58a and 58b is preferably as small as possible, for example, about φ2 μm, but may be about φ50 μm.
The net-like fine holes 58a and 58b are formed uniformly with respect to the peripheral surface, but may be formed randomly.

Further, the formation density of the fine holes 58a and 58b may be increased on the peripheral surface of the air-cooling cylinders 55a and 55b close to the heat source, and the formation density of the fine holes 58a and 58b may be reduced on the peripheral surface far from the heat source.
When the formation density of the fine holes 58a and 58b is increased in the peripheral surfaces of the air-cooling cylinders 55a and 55b close to the heat source, the air-cooling cylinders 55a and 55b having a negative pressure effectively 55b can be drawn into the interior, increasing the heat transfer efficiency.

The opening area of the opening 57a on the upstream side of one air-cooled cylinder 55a is made larger than the total opening area of the net-like fine holes 58a formed on the peripheral surface of the air-cooled cylinder 55a. That is, the flow rate of air flowing in from the opening 57a of the air-cooling cylinder 55a is set to be larger than the flow rate of air flowing in from the mesh-like fine holes 58a.
Similarly, the opening area of the upstream opening 57b of the other air-cooled cylinder 55b is made larger than the total opening area of the net-like fine holes 58b formed in the peripheral surface of the air-cooled cylinder 55b.
In such a case, since the flow rate of the air flowing in from the front ends of the air cooling tubes 55a and 55b is large, the inside of the air cooling tubes 55a and 55b can be maintained at a negative pressure.

  Inside the disk device main body, the internal air temperature rises to a positive pressure due to the heat generated by the heat source, but the bimetal constituting the open / close plates 36a and 36b has a temperature at which the inside of the disk device main body becomes a positive pressure. In this case, the opening / closing plates 36a, 36b start to open, and the opening / closing plates 36a, 36b are closed when the temperature returns to the atmospheric pressure.

  In addition, when a burr | flash is made when forming the net-like fine holes 58a and 58b, it is not necessary to remove the burr, and it is preferable that the air-cooled cylinders 55a and 55b protrude inside. The burrs of the net-like fine holes 58a and 58b are in good thermal contact with the air flowing in from the openings 57a and 57b of the air-cooled cylinders 55a and 55b, thereby improving the heat transfer efficiency.

FIG. 8 is a schematic side view showing the operation of the disk device according to the second embodiment, and FIG. 9 is a schematic plan view showing the operation of the disk device.
8 and 9, black arrows indicate the flow of air, and white arrows indicate heat exhaust by the exhaust fan 6.

In the disk device according to the second embodiment, when the power switch 5c (see FIG. 1) of the recording / playback apparatus 1 is turned on, the exhaust fan 6 operates at a low speed. When the exhaust fan 6 operates at a low speed, the air in the housing 2 is exhausted from the exhaust port 3.
After a predetermined time, when the temperature of the opening / closing plate 36b of the disk device 8 is equal to or lower than a specified value (room temperature), the exhaust fan 6 maintains a low speed rotation. When the temperature exceeds the specified value, the exhaust fan 6 rotates normally. The inside of the housing 2 is maintained at a negative pressure.

  In the disk device according to the second embodiment, first, heat generated by the rotational drive of the spindle motor 18, heat generated by write strategy control of the semiconductor laser 26a of the laser stem 26, etc. are generated. Due to the heat transfer process from the air to the air, the temperature of the air in the disk device main body rises and becomes warm air, and the pressure in the disk device main body, that is, the dust-proof space 15, becomes positive.

When the temperature inside the disk device main body reaches a positive pressure, the opening / closing plates 36a, 36b begin to open, and when the temperature returns to atmospheric pressure (room temperature), the opening / closing plates 36a, 36b close.
When the open / close plates 36a and 36b are opened and closed, the exhaust fan 6 rotates at a controlled rotational speed corresponding to the opening degree of the open / close plate 36a, that is, corresponding to the temperature of the temperature sensor 6a.

  Since the heat transfer process from the warm air to the mechanism base 56, the heat transfer process by the heat conduction of the mechanism base 56, and the flow rate adjustment process by the opening / closing plate are the same as those in the first embodiment, detailed description will be omitted.

Due to the dynamic pressure of the air that flows in according to the opening degree of the opening / closing plates 36a, 36b that deforms with the temperature change, the air cooling cylinders 55a, 55b have a lower pressure (negative pressure) than the inside of the dust-proof space 15, and are dust-proof. The warm air in the space 15 is drawn into the air cooling cylinders 55a and 55b, and the efficiency of heat transfer is increased.
When the inside of the dust-proof space 15 is positive pressure, the net-like fine holes 58a and 58b are very small, so that dust does not enter the dust-proof space 15 from the air-cooled cylinders 55a and 55b that are at negative pressure. The space 15 maintains the dustproof function even if it is a substantially sealed space.

  Further, air flows from the net-like fine holes 58a and 58b of the channels 52a and 52b, and the channels 52a and 52b are air-cooled.

The air flowing into the air cooling cylinders 55a and 55b cools the inside of the dust-proof space 15 partitioned by the mechanism base 56 by air cooling the peripheral surfaces of the air cooling cylinders 55a and 55b formed by the mechanism base 56 and the channels 52a and 52b. To do.
The air that has cooled the peripheral surfaces of the air-cooling cylinders 55 a and 55 b passes through the openings 11 a and 11 b of the lower housing 9 b of the disk device 8, and is forcibly exhausted from the exhaust port 3 by the exhaust fan 6 of the recording and playback device 1. The

  As described above, in the disk device according to Embodiment 2, the dust-proof space 15 that isolates the disk 7 and the optical pickup 24 and the like from the outside air is formed in the disk device body, and the dust-proof space 15 is a net-like fine hole of several hundred μm or less. Since the warm air in the dust-proof space 15 that is positive pressure is drawn into the air-cooling cylinders 55a and 55b via 58a and 58b, the inside of the disk device main body can be efficiently air-cooled. Further, since the inside of the dust-proof space 15 is at a positive pressure, dust does not enter from the mesh-like fine holes 58a and 58b, and can be protected.

Although the net-like fine holes 58a and 58b are formed on the peripheral surfaces of the air-cooling cylinders 55a and 55b of the second embodiment, the channels 52a and 52b may not have the net-like fine holes 58a and 58b. . That is, the net-like fine holes 58a and 58b of the air-cooling cylinders 55a and 55b are formed so as to communicate the air-cooling cylinders 55a and 55b with the dust-proof space, and may be formed only on the lower surface side of the mechanism base 56. .
The net-like fine holes 58 a and 58 b are formed only on the peripheral surfaces of the channels 52 a and 52 b, and may not be formed on the lower surface side of the mechanism base 56.

(Embodiment 3)
Next, a third embodiment will be described.
The air-cooled cylinder in the disk device according to the third embodiment is such that the passage is narrowed toward the vicinity of the heat source to increase the flow velocity, and only the form of the air-cooled cylinders 35a and 35b in the first embodiment is different. The rest of the configuration other than the air-cooled cylinder is substantially the same as in the first embodiment.

FIG. 10 is a perspective plan view showing the inside of the disk device according to Embodiment 3, and FIG. 11 is a perspective view showing the disk device including an air-cooling cylinder for air cooling.
Reference numeral 60 a indicates an A region on the mechanism base 16 where the temperature is relatively high due to heat generated by the rotational drive of the spindle motor 18, and reference numeral 60 b indicates the semiconductor laser 26 a of the laser stem 26 corresponding to the movable range of the optical pickup 24. And the B area | region on the mechanism base 16 where temperature becomes comparatively high with the heat | fever of the board | substrate 29 grade | etc., Is shown.

  In the third embodiment, the lower surface of the mechanism base 16 is directed toward the A region 60a and the B region 60b on the mechanism base 16 from the front side of the lower housing 9b to the openings 11a and 11b of the rear wall 9c. The narrowing channels 62 a and 62 b are attached to form a cylinder together with the lower surface of the mechanism base 16. That is, air-cooling cylinders 65a and 65b are formed by the mechanism base 16 and the respective channels 62a and 62b, and the passages are narrower than the ends near the A region 60a and the B region 60b. The air-cooling cylinders 65a and 65b have a straight tube shape, and each form an air flow path.

  In the air cooling process in the disk device according to the third embodiment, the air flow rate increases or decreases and flows into the air cooling cylinders 65a and 65b in accordance with the opening degree of the opening / closing plates 36a and 36b that are deformed as the temperature changes. . Since the flow paths of the air cooling cylinders 65a and 65b become narrower toward the relatively high temperatures of the A area 60a and the B area 60b, the flow rate of the inflowing air becomes faster, and the narrow air cooling cylinders 65a and 65b Effectively air cools the surrounding surface. Since the A region 60a and the B region 60b having relatively high temperatures are effectively air-cooled, the air cooling speed of the dust-proof space 15 is increased.

  In the third embodiment, excluding the air cooling process, the heat generation process in the first embodiment, the heat transfer process from the warm air to the mechanism base 16, the heat transfer process by the heat conduction of the mechanism base 16, the flow rate adjustment process by the opening and closing plate, Since it is the same as the exhaust heat process, detailed description is omitted.

  Thus, in the disk device according to Embodiment 3, the dust-proof space 15 that isolates the disk 7 and the optical pickup 24 and the like from the outside air is formed in the disk device main body, and a relatively high temperature area in the dust-proof space 15 is formed. Since the air cooling is effectively performed by increasing the flow velocity of the air cooling cylinders 65a and 65b, the inside of the disk device main body can be efficiently air cooled.

  In addition, you may make it form the net-like fine hole like Embodiment 2 in the surrounding surface of the air-cooling cylinders 65a and 65b of Embodiment 3. FIG. The net-like fine holes 58 a and 58 b may be formed only on the lower surface side of the mechanism base 16.

(Embodiment 4)
Next, a fourth embodiment will be described.
The air cooling cylinders 35 (35a, 35b), 55a, 55b, 65a, 65b of the first to third embodiments are provided from the front side of the lower housing 9b to the openings 11a, 11b of the rear wall 9c. In the fourth embodiment, the lower casing 9b is provided in an L shape from the front side to the side wall side, and the other configuration other than the air-cooled cylinder is substantially the same as that of the first embodiment.

FIG. 12 is a perspective view showing a disk device provided with an air cooling cylinder for air cooling in the fourth embodiment.
In the fourth embodiment, a channel 72a that extends from the front side of the lower housing 9b to the rear wall 9c side on the lower surface of the mechanism base 16 and goes to the A region 60a on the mechanism base 16 is formed together with the lower surface of the mechanism base 16 It is attached to make a body. It is connected to the lower surface of the mechanism base 16 in a direction orthogonal to the channel 72a, and the channel 72b toward the B region 60b on the mechanism base 16 extends to the side wall 9d of the lower housing 9b together with the lower surface of the mechanism base 16 to form a cylindrical body. It is attached to make.

The channel 72a and the channel 72b are in communication with each other and constitute a channel 72 bent at 90 degrees.
An opening 11c is formed in the side wall 9d of the lower housing 9b, and the rear end 73 of the channel 72 is in contact with the periphery of the opening 11c. The front end portion 74 of the channel 72 is provided with a door-shaped rectangular opening / closing plate 36 having a front view.

  An air cooling cylinder 75 is formed by the lower surface of the mechanism base 16 and the channel 72. The air-cooled cylinder 75 has a tubular shape bent at 90 degrees, and forms an air flow passage. The channel 72 is made of a material having a higher thermal conductivity than the housing 9. The material may be the same material as that of the mechanism base 16, and for example, copper is preferable.

In the disk device according to the fourth embodiment, except for the air cooling process, the heat generation process, the heat transfer process from the hot air to the mechanism base 16, the heat transfer process by the heat conduction of the mechanism base 16, in the first embodiment, Since it is the same as the flow rate adjustment process by the opening and closing plate and the exhaust heat process, detailed description is omitted.
In the air-cooling process in the fourth embodiment, the air flowing into the air-cooled cylinder 75 with the flow rate increased or decreased corresponding to the opening degree of the opening / closing plate 36 that is deformed as the temperature changes is relatively high in the A regions 60a and B. Since the region 60b is effectively air-cooled, the air-cooling speed of the dust-proof space 15 is increased.

  As described above, in the disk device according to the fourth embodiment, the dust-proof space 15 that isolates the disk 7 and the optical pickup 24 (see FIG. 10) from the outside air is formed in the disk device main body. Since the high temperature region is effectively air-cooled, the inside of the disk device main body can be efficiently air-cooled.

(Embodiment 5)
Next, a fifth embodiment will be described.
In Embodiments 1 to 4, the opening / closing plate is provided only at the front end of the air-cooled cylinder, but in Embodiment 5, it is provided at both ends of the front end and the rear end, and other configurations are substantially the same. The same as in the first embodiment.

FIG. 13 is a partial cross-sectional view showing the air-cooled cylinder of the disk apparatus according to Embodiment 5, and FIG. 13 (a) is a partial cross-sectional view showing a state in which the open / close plates at both ends of the air-cooled cylinder are closed. ) Is a partial cross-sectional view showing a state where the open / close plates at both ends are slightly opened, and FIG. 13 (c) is a partial cross-sectional view showing a state where the open / close plate at the rear end is wider than the open / close plate at the front end.
The opening / closing plate 36 provided at the front end portion 34 of the channel 32 and the opening / closing plate 76 provided at the rear end portion 33 are the same opening / closing plate, and are made of the same type of bimetal. That is, the open / close plates 36 and 76 are similarly bent to the outside of the air-cooled cylinder 35 to open and close with respect to the same temperature change. The contact portions 37 and 77 of the opening and closing plates 36 and 76 are fixed to the upper surface of the mechanism base 16 with screws 38 with good thermal contact.
In FIG. 13, reference numeral 6 denotes an exhaust fan of the recording / reproducing apparatus 1 (see FIG. 1).

  In the air-cooled cylinder 35 according to the fifth embodiment, first, the heat generated from the heat source in the disk device main body is caused by the heat conduction of the mechanism base 16 so that the temperature of the open / close plates 36 and 76 rises in substantially the same manner. Then, from the closed state, it is curved and opened outward in response to the temperature change (see FIG. 13B).

Next, the air that flows into the air-cooled cylinder 35 with the flow rate increased or decreased corresponding to the opening degree of the opening and closing plates 36 and 76 that are deformed as the temperature changes cools the peripheral surface of the air-cooled cylinder 35, and is discharged by the exhaust fan 6. Heat exhausted.
Further, the air that has flowed into the air-cooled cylinder 35 becomes warm air by heat transfer on the peripheral surface of the air-cooled cylinder 35, and is transferred to the opening / closing plate 76 on the rear end 33 side.

Next, the temperature of the opening / closing plate 76 becomes higher than the opening / closing plate 36 on the front end portion 34 side by the warm air flowing out from the air-cooled cylinder 35, and the opening / closing plate of the rear end portion 33 is larger than the opening degree of the opening / closing plate 36 of the front end portion 34. The opening degree of 76 becomes large (refer FIG.13 (c)).
And the flow volume of the warm air which flows out out of the air cooling cylinder 35 increases, the flow volume of the air which flows in from the front-end part 34 increases, and the efficiency which air-cools the surrounding surface of the air cooling cylinder 35 becomes high.

  As described above, in the disk device according to the fifth embodiment, the opening degree of the open / close plate 76 at the rear end of the air-cooled cylinder 35 is determined by the heat transfer of the air that has cooled the peripheral surface of the air-cooled cylinder 35. It is possible to increase the air flow rate of the air-cooled cylinder 35 by making it larger than the opening degree of the open / close plate 36, and effectively air-cool the peripheral surface of the air-cooled cylinder 35, thereby effectively cooling the dust-proof space 15. can do.

(Embodiment 6)
Next, a sixth embodiment will be described.
The air-cooled cylinders of the first to fifth embodiments are formed in a square cylinder shape by the mechanism base and the channel, but a pipe or the like may be used instead of the channel as a member forming the air-cooled cylinder.
In the sixth embodiment, a pipe is brought into contact with the mechanism base to form an air-cooled cylinder, and heat radiating fins are provided in the pipe. Other configurations other than the air-cooled cylinder are substantially the same as those in the first embodiment.

14 is a partial perspective view showing a square pipe forming an air-cooled cylinder of the disk apparatus according to Embodiment 6, FIG. 15 is a perspective view showing a triangular pipe forming an air-cooled cylinder, and FIG. 16 shows a semicircular pipe forming an air-cooled cylinder. FIG. 17 is a perspective view showing a semi-elliptical pipe forming an air-cooled cylinder.
In the square pipe 80 and the triangular pipe 81, a plurality of rectangular plate-shaped heat radiation fins 90 and 91 are erected along the air flow path on the ceiling surface on the mechanism base 16 side. The radiating fins 91 of the triangular pipe 81 are formed with the radiating fins 91 facing the apex angle of the triangular pipe 81 higher than the other radiating fins 91 to widen the radiating area.

The semicircular pipe 82 and the semi-elliptical pipe 83 are each provided with a plurality of rectangular plate-like heat radiation fins 92 and 93 erected along the air flow path on the ceiling surface on the mechanism base 16 side. The heat dissipating fins 92 of the semicircular pipe 82 are formed to have different fin heights depending on the height from the peripheral surface to the ceiling surface so that the heat dissipating area is widened.
When the heat dissipation area is increased, the heat dissipation effect is increased.

  In the sixth embodiment, the heat transfer efficiency of the air flowing through the air-cooling cylinder 95 is increased by the heat transfer of the radiation fins 90, 91, 92, 93, and the dust-proof space 15 in the disk device body is effectively air-cooled. can do.

(Embodiment 7)
Next, a seventh embodiment will be described.
In the seventh embodiment, a circular pipe is used in place of the channel forming the air-cooled cylinder, and other configurations other than the mechanism base and the air-cooled cylinder are substantially the same as those in the first embodiment.
FIG. 18 is a partial perspective view showing a circular pipe forming an air-cooled cylinder of the disk device according to the seventh embodiment.
In the seventh embodiment, two circular pipes 84 and 84 are attached to the lower surface of the mechanism base 86 to form an air-cooled cylinder 85 for air-cooling the dust-proof space 15. Corresponding to the side surface of the circular pipe 84, a semi-cylindrical recess 87 is formed upward in the mechanism base 86, and the circular pipe 84 has a maximum contact area from the lower surface side of the recess 87 of the mechanism base 86. It is attached.
Since other configurations and operational effects in the seventh embodiment are the same as those in the first embodiment, detailed description thereof is omitted.

The open / close plates 36 (36 a, 36 b), 40, 76 of the first to seventh embodiments are curved outward from the air-cooled cylinders 35 (35 a, 35 b), 55 a, 55 b, 65 a, 65 b, 75, 85, 95. However, it may be curved inward in consideration of the clearance in the use environment.
Further, the air-cooled cylinders 35 (35a, 35b), 65a, 65b, 75, 85, and 95 of the first, second, fourth, and seventh embodiments are provided with the net-like fine holes 58a and 58b as in the third embodiment. May be. That is, the micro holes 58a and 58b are provided with an air-cooled cylinder in one or both of the mechanism bases 16, 56 and 86 and the air-cooled cylinders 35 (35a and 35b), 55a, 55b, 65a, 65b, 75, 85 and 95, respectively. It is preferable that it is formed so as to communicate with the dustproof space, and appropriate combinations are possible as described in the third embodiment.

  Air-cooled tubes 35 (35a, 35b), 55a, 55b, 65a, 65b, 75, 85, 95 are provided from the front side of the lower housing 9b to the rear wall 9c or the side wall 9d. Depending on the positional relationship with the exhaust fan 6, for example, it may be appropriately provided in the vertical and horizontal directions instead of the front and rear direction. The air-cooled tube is not limited to a straight tube, and may be provided by appropriately combining a straight tube air-cooled tube and an L-shaped air-cooled tube, or may be provided in communication with each other. There are no restrictions on the shape and number of air-cooled tubes.

It is a perspective view which shows the recording / reproducing apparatus which accommodated the disk apparatus based on Embodiment 1 of this invention. 2 is a perspective view showing the inside of the disk device according to Embodiment 1. FIG. It is a perspective view which shows the housing structure of a disk apparatus. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2 showing the inside of the disk device. FIG. 5 is a VV cross-sectional view of FIG. 2 showing an opening / closing plate of the disk device. It is a perspective view which shows the modification of an opening-and-closing board. 6 is a perspective view showing an air-cooled cylinder according to Embodiment 2. FIG. FIG. 10 is a schematic side view showing the operation of the disk device according to the second embodiment. It is a schematic plan view showing the operation of the disk device. 6 is a perspective plan view showing the inside of a disk device according to Embodiment 3. FIG. It is a perspective view which shows a disk apparatus provided with the air cooling cylinder for air cooling. FIG. 10 is a perspective view showing a disk device provided with an air-cooling cylinder for air-cooling in a fourth embodiment. FIG. 9 is a partial cross-sectional view showing an air cooling cylinder of a disk device according to a fifth embodiment. FIG. 10 is a partial perspective view showing a square pipe forming an air-cooled cylinder of a disk device according to a sixth embodiment. It is a perspective view which shows the triangular pipe which makes an air cooling cylinder. It is a perspective view which shows the semicircle pipe which makes an air cooling cylinder. It is a perspective view which shows the semi-elliptical pipe which makes an air cooling cylinder. FIG. 10 is a partial perspective view showing a circular pipe forming an air-cooled cylinder of a disk device according to a seventh embodiment.

Explanation of symbols

1 Recording / playback device 2 Case (case)
6 Exhaust fan 7 Disc 8 Disc device 9 Housing 10a Opening 12 Tray 13 Front face 15 Dust-proof space 16, 56, 86 Mechanism base (partition body)
24 Optical pickup 35 (35a, 35b), 55a, 55b, 65a, 65b, 75, 85, 95 Air-cooled cylinder 36 (36a, 36b), 40, 76 Opening / closing plate (opening variable part)
37 (37a, 37b), 77 Contact portion 39 (39a, 39b) Deformed portion 58a, 58b Micro hole 90, 91, 92, 93 Radiation fin

Claims (12)

In a disk device provided with an optical pickup for reproducing information recorded on a disk or recording information in a housing,
A partition that partitions the housing and forms a dust-proof space in the housing to protect the disk and the optical pickup;
A disk device comprising: an air-cooling cylinder that allows air to pass through the housing and cools the partition.   2. The disk device according to claim 1, further comprising an opening degree varying portion that is deformed with a temperature change and changes an opening degree of the air cooling cylinder at an end of the air cooling cylinder.   The disk apparatus according to claim 1, wherein the air-cooled cylinder is formed integrally with the partition body.   4. The disk according to claim 1, wherein one or both of the partition body and the air-cooled cylinder have a large number of fine holes that allow the air-cooled cylinder to communicate with the dust-proof space. apparatus.   5. The disk device according to claim 1, wherein the air-cooled cylinder has a large number of fine holes on a peripheral surface.   6. The disk device according to claim 1, wherein the partition and the air-cooled cylinder are made of a member having a higher thermal conductivity than the casing. A heat source in the dust-proof space;
The disk apparatus according to claim 1, wherein the air-cooled cylinder is formed to be narrower than an end portion of the air-cooled cylinder in the vicinity of the heat generation source.   The disk device according to claim 1, wherein heat radiation fins are formed on an inner surface of the air-cooled cylinder.   The disk device according to any one of claims 2 to 8, wherein the opening degree variable portion is variable in opening degree due to temperature dependence of a bimetal or a shape memory alloy.   10. The disk device according to claim 2, wherein the opening degree varying unit is configured to be deformed to the outside or the inside of the air-cooled cylinder according to a temperature change. The opening variable part is
It has a plate shape that closes the end of the air-cooled cylinder, and a deformation part that curves and deforms as the temperature rises;
11. The apparatus according to claim 2, further comprising: a contact portion that protrudes from a part of the deformable portion toward a side portion of the air-cooled cylinder and is contacted in the vicinity of an end of the air-cooled cylinder. Or the disk device according to any one of the above. A recording / reproducing apparatus comprising a case, an exhaust fan for exhausting air in the case, and the disk device according to any one of claims 1 to 11,
A recording / reproducing apparatus characterized in that the air-cooled cylinder is set to a negative pressure by exhaust of the exhaust fan.

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