JP2003085964A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool a heat generating component arranged at the rear part in a housing by using an air flow generated when an optical disk rotates without increasing the number of components nor causing noise to leak even when the component storage density of an optical disk device in which a mechanical unit supporting an optical pickup and a spindle motor on a disk tray so supported as to move in and out of the housing is assembled, increases as the device housing is made small-sized. SOLUTION: The optical disk device is equipped with a disk tray 4 which is put in the housing so that it moves forward and backward and mounted with the optical disk, an optical pickup 6, a mechanical unit 7 which is fixed to the disk tray and holds a moving means for moving a spindle motor 5 and the optical pickup 6 radially, and a circuit board 12 which is mounted at the rear part in the housing and mounted with the heat generating component; and a plurality of opening parts 4a to 4e are penetratingly formed at the rear part of the disk tray which projects upward when the mechanical unit is stored in the housing and the air flow generated when the optical disk rotates is supplied to the circuit board through the opening parts to accelerate heat radiation of the heat generating component.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a CD and a CD-RO.
M, CD-R / RW, DVD-ROM, DVD-RW,
The present invention relates to an improvement of an optical disk device that performs recording / reproduction on an optical disk such as a DVD + RW.

[0002]

2. Description of the Related Art CD, CD-ROM, CD-R / RW,
Recording / reproducing information on / from an optical disc (disc-shaped recording medium) such as a DVD-ROM, a DVD-RW, and a DVD + RW.
Alternatively, an optical disk recording / reproducing device (hereinafter, referred to as an optical disk device) for reproducing is standardly installed in a computer device such as a personal computer, but so that it can be installed in a small personal computer such as a notebook computer which has been popular recently. An optical disc device has been developed, which is intended to reduce the size and thickness of the entire device. Even in such a miniaturized optical disk device, improvement in reproduction / recording speed is required.
The optical disc device supports a disc tray on which an optical disc is mounted so as to be able to move forward and backward in and out of the housing, and while supporting and rotating the center hole of the optical disc on the disc tray housed in the housing by a turntable of a spindle motor, Recording and playback are performed with an optical pickup. In order to reduce the size and thickness of the optical disc device, a mechanical unit having means for moving the spindle motor and the optical pickup in the radial direction is provided with a loading mechanism for moving the optical disc unit integrally with the disc tray. The optical disk is configured to be recorded / reproduced by an optical pickup and a driving mechanism in a state of being housed in a box-shaped device body (housing). For example, in order to mount the optical disk device in the limited space inside the casing of the notebook computer, the width is 128 mm and the depth is 126 m.
m, height: It is necessary to set the external dimensions of the optical disk device to 12.7 mm or less. However, when the housing of the optical disk device is miniaturized in this way, an LSI for driving and controlling the optical pickup and the driving mechanism housed inside the housing,
Since the circuit board on which heat-generating components such as ICs are mounted is installed in the rear part of the housing, heat generated from the heat-generating components is trapped inside the device and causes an increase in temperature. This rise in temperature causes a problem that recording / reproducing performance deteriorates. Further, it is difficult to install a cooling fan due to the limited storage space in the housing of the optical disk device, and even if it is installed, the problem of temperature rise due to exhaustion into the notebook computer body remains, and its effect Can not expect much.

Next, in a small-sized optical disk device that can be mounted on a notebook computer, the housing constituting the main body of the device is made of a thin metal plate, and due to the width and depth dimensions, the disk tray moves in the moving direction. On the other hand, the optical pickup is often installed in front of the device with an angle of several tens of degrees. Therefore, the radiation noise generated from the LD mounted on the optical pickup and its driving circuit is more likely to leak than the standard size (width 146 mm, height 41.3 mm, depth 203 mm) optical disc device mounted on the desktop personal computer, and various EMI noises may occur. It is difficult to meet the standard. For example, Japanese Patent Laid-Open No. 2000-231782 discloses a configuration in which heat generated by rotating an optical disc is circulated to cool the inside of the casing, but a configuration in consideration of the presence of a disc tray for supporting an optical disc or the like. Therefore, no consideration has been given to the specific configuration for cooling the heat generating component in relation to the disc tray. In particular, there is a high possibility that the airflow of which the temperature has risen through the opening or the like due to natural convection circulates in the casing and hinders the heat radiation effect.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a mechanical unit that supports an optical pickup and a spindle motor is assembled to a disc tray that is movably supported in and out of a housing. In the optical disc device, even when the component housing density is increased due to the miniaturization of the device casing, the airflow generated when the optical disc is rotated is used without increasing the number of components and leaking noise. Therefore, it is an object of the present invention to provide an optical disk device capable of effectively cooling a heat-generating component arranged in the rear part of a housing.

[0005]

In order to solve the above-mentioned problems, the invention of claim 1 provides a housing, a disk tray slidably supported inside and outside the housing, and a disk tray inside the housing. A spindle motor provided with a turntable for supporting and rotating the center portion of the optical disc on the accommodated disc tray, an optical pickup for recording and reproducing the optical disc rotated by the spindle motor, and fixed to the disc tray. A mechanical unit that holds a moving unit that moves the spindle motor and the optical pickup forward and backward in a radial direction; and a circuit board that is disposed at a rear portion of the housing and that mounts a heat-generating component, and the mechanical unit is provided in the housing. When housed, a plurality of openings are formed through the rear portion of the disc tray projecting above the circuit board, and And wherein the air flow generated during rotation is supplied to the circuit board through the opening that is configured to facilitate heat dissipation of the heat generating parts. According to a second aspect of the present invention, the plurality of openings formed through the rear portion of the disc tray are arranged in a plurality of rows in an arc shape along the radial direction of the optical disc mounted on the spindle motor, and the row of openings on the inner diameter side is arranged. The number of openings is larger than the number of openings in the opening row on the outer diameter side, and the cross-sectional shape of each opening is inclined toward the circuit board direction. According to a third aspect of the present invention, the mechanical unit is fixed to the disc tray via a bottom plate member that covers the lower surface of the mechanical unit, and a bent portion is provided on the lower surface of the bottom plate member so as to form the bottom portion of the housing. A conductive elastic member for grounding is arranged on the bottom surface of the lower case, and the bottom plate member is grounded to the conductive elastic member via the bent portion when the mechanical unit is housed in the housing. It is characterized by having done. According to a fourth aspect of the present invention, the bent portion on the lower surface of the bottom plate member and the elastic member on the inner bottom surface of the lower case are located on the front side and the rear side of the disc tray when the mechanical unit is housed in the housing. It is characterized by being arranged. According to a fifth aspect of the present invention, a plurality of grooves having a radius of curvature are formed on the upper surface of the upper case that constitutes the top plate of the housing, and have radial curvature from a position corresponding to the center of the optical disk toward the outer diameter direction. Is characterized by.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is an exploded perspective view showing the configuration of an optical disc device according to an embodiment of the present invention, that is, a compact and thin optical disc device that can be mounted on a notebook computer. The optical disk device 1 includes a lower case 2 made of sheet metal and an upper case 3 made of sheet metal which covers the lower case 2.
A disk tray 4 on which an optical disk (not shown) is placed and movable in the front-back direction (inside and outside) of the apparatus main body; a spindle motor 5 which fits and supports a center hole of the optical disk by a turntable 5a and rotates; The optical pickup 6 supported so as to be able to move forward and backward in the radial direction of the optical disc, the mechanical unit 7 assembled to the disc tray 4 while supporting the optical pickup 6 including the spindle motor 5 and the moving means, the disc tray 4, and the mechanism. A pair of movable rails 8 and 9 provided on the lower case 2 so that the unit 7 integrally moves in the front-rear direction, and a discharge mechanism (not shown) that pushes the pair of rails 8 and 9 and the disc tray 4 forward. And a loading mechanism 10 including a lock mechanism for holding the disc tray 4 stored in the apparatus body. It is equipped with a. As a material for the lower case 2 and the upper case 3, a zinc-treated steel plate (thickness 0.4 to 0.5 mm), which is advantageous in terms of cost, is often used.

2 (a) and 2 (b) are a side longitudinal sectional view of an optical disk device according to an embodiment of the present invention and a plan view of a disk tray. As shown in FIG. 2, the mechanical unit 7 has a bottom plate member 11 fixed to cover the lower surface thereof.
Along with the disc tray 4, a vibration-proof rubber 7a,
It is fixed via 7b. As a material of the bottom plate member 11, a thin plate metal plate (thickness: 0.
2 to 0.3 mm) can be used, but tinplate and stainless steel are often used in consideration of rust prevention, and tinplate is advantageous in terms of cost. A circuit board 12 on which a circuit for driving and controlling the optical disk device 1 is formed is installed behind the lower case 2 and is connected to the mechanical unit 7 by an FPC 13. On the circuit board 12, heat-generating components such as a driver IC 12a for driving various motors and an LSI 12b for various controls are mounted. The amount of heat generated by the mounting elements serving as these heat-generating components has become relatively large as the speed of the apparatus has increased. As described above, since the optical disk device 1 itself is housed inside a small device such as a notebook computer, it is necessary to efficiently radiate and cool the heat generated by the heat-generating components on the circuit board 12.

As shown also in FIG. 1, the front panel 1 is provided with an eject button 14 on the front surface of the disc tray 4 for pushing out the disc tray 4 by pressing the disc tray 4 when the disc tray 4 is ejected.
5 is attached. The eject button 14 is configured to interlock with a lock mechanism (not shown). When the eject button 14 is pressed, the lock mechanism is released and the disc tray 4 is ejected by an eject mechanism (not shown). FIG. 2A shows a state in which the optical disc 100 is mounted on the turntable 5a of the spindle motor 5 and housed in the optical disc device main body (housing). At this time, the rear portion of the disc tray 4 is overhanging above the circuit board 12. The characteristic configuration of the present invention is that a plurality of openings 4a and 4b (opening rows 4a 'and 4b') are formed through the rear portion of the disc tray 4 at a proper position, that is, a position facing the circuit board 12, so that the spindle The airflow generated by the rotation of the optical disk 100 mounted on the motor 5 is directed toward the circuit board 12 through the openings 4a and 4b and contributes to the heat dissipation of the mounted heat generating components such as the LSIs 12b and 12c. is there. In other words, the air flow generated by the rotation of the optical disk, which has not been used sufficiently in the past, allows the opening portion 4 as a ventilation hole to pass the air flow.
It is characteristic that the heat dissipation and cooling effects are exhibited by positively supplying the heat-generating component (using the heat-generating component as a target) via a and 4b. Further, noise from the noise generating source inside the device does not leak to the outside. The arrangement, the number, the number of rows, and the like of the openings 4a and 4b can be variously changed.

Next, FIGS. 3 (a) and 3 (b) are a side longitudinal sectional view of an optical disk device according to another embodiment of the present invention and a plan view of a disk tray. As in the case of the embodiment of FIG. 2, the disc tray 4 of this embodiment has a circular arc shape including openings 4c, 4d, and 4e as through holes at the rear portion of the disc tray (a portion facing the circuit board 12). Although the opening rows 4c ', 4d', and 4e 'are provided, they differ from the embodiment of FIG. 2 in the arrangement and shape of each opening. That is, the plurality of openings 4c, 4d, 4e penetratingly formed in the rear portion of the disc tray 4 are arranged in a plurality of rows in an arc shape along the radial direction of the optical disc 100 mounted on the spindle motor 5, and the inner diameter side openings are formed. A characteristic is that the number of openings in each row is set to be larger than the number of openings in the row of openings on the outer diameter side, and the cross-sectional shape of each opening is inclined toward the circuit board 12 direction. That is, the opening row 4 of this embodiment
c ', 4d', and 4e 'are openings 4c, 4d arranged along the circumference of predetermined radii r1, r2, r3 from the center of the optical disk 100 whose center is supported by the spindle motor 5, respectively. 4e, and the vertical cross-sectional shape of each opening is a hole shape inclined toward the circuit board 12. Therefore, the airflow due to the rotation of the optical disc 100 can be more efficiently guided onto the circuit board 12, and the LSI 12
The heat dissipation effect of heat-generating components such as b and 12c can be mentioned. In general, the spindle motor control method in the recording mode is the CLV method (CLV = Constant Linear Velocity), so that the rotation speed of the optical disc 100 is highest at the inner circumference and slower toward the outer circumference. Therefore, as shown in FIG. 3B, by setting the number of openings in each opening row at the rear of the disc tray so as to be gradually reduced in the order of 4c ′> 4d ′> 4e ′, each opening 4c, 4c
The speed of the airflow from d and 4e toward the circuit board 12 is also increased, and it becomes an efficient heat dissipation means. In the embodiment shown in FIG. 2, since the openings 4a and 4b, which are simply through holes, are provided in the rear portion of the disk tray 4 corresponding to the position directly above the circuit board 12, natural convection is used to increase the temperature through the openings 4a and 4b. Although it is possible that the rising air flow circulates and hinders the heat dissipation effect, in the configuration of the present embodiment, a plurality of openings are provided so that the inner circumference ≧ the outer circumference, and are located immediately above the circuit board 12. Since the number of openings to be formed is small, it is possible to suppress the decrease in the heat radiation effect due to the natural convection.

Next, FIGS. 4 (a), (b), (c) and (d)
FIG. 6A is a longitudinal sectional view, an enlarged view of a main part, and a perspective view of the main part of an optical disk device according to another embodiment of the present invention. In this embodiment, the mechanical unit 7 is fixed to the disc tray 4 via a bottom plate member 11 that covers the lower surface of the mechanical unit 7, and a protruding bent portion 11a is provided on the lower surface of the bottom plate member 11 so as to project from the housing. Support part 2a provided on the inner bottom surface of the lower case 2 forming the bottom part
A conductive elastic member 20 for grounding is disposed in the bottom plate member 11 via the bent portion 11a when the mechanical unit 7 is housed in the housing as shown in FIG. 4A. The feature is that it is configured to be grounded. A disk tray 4 is supported by a lower case 2 made of a zinc-treated steel plate or the like by the rails 8 and 9 shown in FIG. Further, the inner bottom surface (upper surface) of the lower case 2 is provided with a standing bent portion (support portion) 2a by cutting and raising, and the standing bent portion 2a is provided with a conductive elastic member 20 formed of a metal leaf spring. It is fixed by an adhesive material as shown in FIG. 4 (b) or by an insertion portion 20a formed into an annular shape by bending as shown in FIG. 4 (c). The conductive elastic member 20 is made of a conductive spring material having a thickness of about 0.1 mm and has a shape as shown in FIG. 4. Normally, the conductive elastic member 20 has a height such that it does not come into contact with the bottom plate member 11 so as not to interfere with the loading operation. It has become. As described above, the mechanical unit 7 including the spindle motor 5 and the optical pickup 6 is fixed to the disc tray 4 via the bottom plate member 11 that covers the lower surface of the mechanical unit 7. When the loading mechanism 10 (not shown) is housed in the main body of the apparatus, the bottom plate member 11 is provided with a bent portion 11a that deforms the conductive elastic member 20 fixed to the lower case 2 by pressing and grounds the bottom plate member 11. Has been. Figure 4
As shown in (b), when the storage is completed, the conductive elastic member 20 and the bottom plate member 11 are surely grounded. Therefore, it can contribute to the reduction of radiation noise. According to this embodiment, since the bottom plate member 11 that covers the lower surface of the mechanical unit 7 and the lower case 2 are grounded via the conductive elastic member 20,
D can be strengthened and radiation noise can be reduced. Also,
Openings 4a to 4e as the heat dissipation means in each of the above embodiments
In addition, the effect of reducing the temperature rise is further enhanced by securing the heat dissipation path by grounding the lower case 2 in the present embodiment. still,
As the material of the conductive elastic member 20, brass, phosphor bronze,
A material having high conductivity such as beryllium copper may be used.

Next, FIG. 5 is a vertical cross-sectional view of an optical disk device according to another embodiment of the present invention. The bent portions 11c and 11b on the bottom surface of the bottom plate member 11 and the conductive elastic member on the inner bottom surface of the lower case 2 are shown. A characteristic is that 20 is arranged so that when the mechanical unit 7 is housed in the housing, it is located on the front side and the rear side of the disc tray 4, respectively. That is,
In the embodiment shown in FIG. 5, the conductive elastic member 20 as a grounding portion is used.
Is provided in two places, one in front of the other. When a grounding part is provided near the projection range where the front optical pickup 6 is installed,
The conductive elastic member 20c fixed to the front standing bent portion 2c of the lower case 2 is slightly more expensive than brass or the like, but if it is grounded to the front bent portion 11a using beryllium copper,
The effect of reducing the radiation noise is better obtained. Further, a conductive elastic member 20b which is similarly fixed to the rear bent portion 2b of the lower case 2 is also arranged at the rear of the drive where the circuit board 12 having many heat generating elements is arranged, and another conductive elastic member 20b provided at the rear of the bottom plate member 11 is provided. When the bent portion 11b is grounded, the effect of reducing the temperature rise in the device is enhanced by the synergistic effect with the heat radiating means 4a to 4e that uses the airflow caused by the rotation of the disk. Further, since the mechanical unit 7 is biased by the conductive elastic members 20c and 30b, there is a secondary effect that there is less play and a margin can be provided against vibration and impact. The above-described embodiment is an example, and the conductive elastic member may be installed at an appropriate position after determining the effect of reducing radiation noise and temperature rise by experiments.

Next, FIG. 6A is an upper perspective view showing the structure of the upper case 3 according to another embodiment of the present invention.
(B) is the AA sectional view. On the upper surface of the upper case 3 which constitutes the top plate of the housing of the optical disk device according to this embodiment, the radial direction is required from the position corresponding to the center of the optical disk 100 supported by the spindle motor 5 toward the outer diameter direction. A plurality of substantially arc-shaped grooves 3a curved with a curvature of
Is formed. The shape of the groove 3a is a recess having a depth equal to or less than the plate thickness of the upper case 3 as shown in (b). By providing the concave portion 3a having a radial curvature in the upper case 3, the convection efficiency of the airflow generated by the rotation of the spindle motor 5 in which the optical disc 100 is mounted is improved, and the heat radiation from the upper case 3 can be increased. The shape of the groove 3a is not particularly limited, but if the groove 3a is provided radially according to the rotation direction of the spindle motor, the groove 3a coincides with the moving direction of the air flow, and therefore the efficiency is good. In addition, in the above-described embodiment, since the groove 3a is formed on the upper surface of the case 3, the corresponding portion of the lower surface of the case 3 is a ridge, but conversely, the same radial groove is formed on the lower surface of the case 3. You may. Further, since the upper case 3 is made of a thin sheet metal, the provision of the groove 3a also has the effect of increasing the strength of the cover alone.

[0013]

As described above, according to the present invention, in the optical disk device in which the mechanical unit supporting the optical pickup and the spindle motor is assembled to the disk tray supported in the inside and outside of the housing so as to be able to move forward and backward, Even if the packing density of parts is increased due to the downsizing of the body, the airflow generated when the optical disk rotates is used to increase the number of parts and increase the number of parts. It is possible to effectively cool the arranged heat-generating components. That is, according to the invention of claim 1, a plurality of openings as ventilation holes for communicating the optical disk side and the circuit board side are provided in the rear part of the disk tray located at a position facing the circuit board installed inside the housing of the apparatus main body. Since the section is provided, the heat generating components such as the LSI and the IC mounted on the circuit board can be radiated by the air flow generated by the rotation of the optical disc. According to a second aspect of the present invention, a plurality of rows of openings arranged in the circumferential direction are provided at positions on the disk tray corresponding to the radial direction of the disk mounted on the spindle motor, and the number of openings is inner circumference ≧ outer circumference. I provided a plurality. Further, since the cross-sectional shape of the opening is set to be inclined in the direction of the circuit board, it is possible to prevent the airflow whose temperature has risen with the increase of the heat dissipation effect from circulating to the opening and hindering the heat dissipation effect. . Since many openings are provided at the position corresponding to the radial direction of the optical disk, especially on the inner peripheral side, the openings located above the circuit board are reduced, and the heat dissipation effect is reduced by the circulation of the airflow whose temperature is raised by natural convection. Can be suppressed.

According to a third aspect of the present invention, in the optical disk device according to the first and second aspects, the mechanical unit is fixed to the tray through a bottom plate member that covers the lower surface of the mechanical unit, and the bottom plate member is provided with a bent portion. A conductive elastic member is provided inside the lower case that forms the exterior, and the bottom plate member and the elastic member are grounded when the mechanical unit is housed in the main body. Therefore, when the mechanical unit is housed in the main body, the elastic member (leaf spring) provided in the lower case is deformed by the bent portion (sheet metal) of the bottom plate member that covers the lower surface of the mechanical unit, and the bottom plate member is reliably grounded. Therefore, it is possible to strengthen GND and contribute to reduction of radiation noise (clearance of various EMI standards). In addition to the heat radiating means according to the first and second aspects, by securing a heat radiating path by grounding (mechanical connection) to the lower case of this configuration, the effect of reducing the temperature rise is further enhanced.
Although it is difficult in terms of design to properly ground the ground so as not to hinder the loading operation, the configuration of this embodiment can be realized without difficulty in terms of design. Claim 4
In the optical disc device according to any one of claims 1 to 3, the bent portion of the bottom plate and the elastic member are provided so as to be located on the front side and the rear side of the drive when the mechanical unit is housed in the main body. In this way, first, the front side of the drive where the optical pickup is arranged is surely grounded, so that the radiation noise can be further reduced. Also, since the rear of the drive where the circuit board with many heating elements is placed is reliably grounded,
The synergistic effect with the heat dissipation means using the airflow caused by the rotation of the optical disk enhances the effect of reducing the temperature rise in the device. Further, since the mechanical unit is biased by the elastic member, there is less backlash, and a sufficient margin can be secured against vibration and shock. According to a fifth aspect of the present invention, in the optical disc device according to the first to fourth aspects, the main body housing portion in which the mechanical unit is housed is composed of an upper case and a lower case, and the upper case is provided with a concave portion having a radial curvature. Therefore, the convection efficiency of the air flow generated by the rotation of the spindle motor equipped with the optical disk is improved, and the heat radiation to the upper case can be increased. When the temperature-increasing airflow circulates as in the case of claim 1, heat dissipation from the upper case is also effective. Since the upper width cover is made of a thin metal plate, the strength of the cover alone can be increased by providing the recess.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of an optical disc device according to an embodiment of the present invention, that is, a compact and thin optical disc device that can be mounted on a notebook computer.

2A and 2B are a longitudinal sectional view of a side portion of an optical disk device according to an embodiment of the present invention and a plan view of a disk tray.

3 (a) and 3 (b) are a side longitudinal sectional view of an optical disk device according to another embodiment of the present invention and a plan view of a disk tray.

4 (a), (b), (c) and (d) are a longitudinal sectional view, an enlarged view of a main part, and a perspective view of the main part of an optical disk device according to another embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of an optical disc device according to another embodiment of the present invention.

6A is an upper perspective view showing the configuration of an upper case 3 according to another embodiment of the present invention, and FIG. 6B is its A-
A sectional view.

[Explanation of symbols]

1 optical disk device, 2 lower case, 3 upper case, 4
Disc trays 4a, 4b, 4c, 4d, 4e Openings, 4a ', 4b' Opening rows, 5 spindle motors, 6 optical pickups, 7 mechanical units, 8, 9
Rail, 10 loading mechanism, 11 bottom plate member, 1
2 circuit boards, 12a driver IC, 12b LS
I, 20 Conductive elastic member, 100 Optical disc.

Claims (5)

[Claims] 1. A housing, a disk tray slidably supported in and out of the housing, and a central portion of an optical disk on the disk tray housed in the housing are supported and rotated. A spindle motor provided with a turntable, an optical pickup for recording / reproducing an optical disc rotated by the spindle motor, and a moving means fixed to the disc tray for moving the spindle motor and the optical pickup forward and backward are held. A mechanical unit; and a circuit board arranged in the rear part of the housing and having a heat-generating component mounted thereon. When the mechanical unit is housed in the housing, the disk tray protrudes above the circuit board. A plurality of openings are formed so as to penetrate, and the airflow generated when the optical disc is rotated is supplied to the circuit board through the openings. Optical disc apparatus characterized by being configured to facilitate heat dissipation of the heat generating component to. 2. A plurality of openings formed through the rear portion of the disc tray are arranged in a plurality of rows in an arc shape along the radial direction of the optical disc mounted on the spindle motor, and the openings of the row of openings on the inner diameter side are formed. 2. The optical disk device according to claim 1, wherein the number of copies is greater than the number of openings in the opening row on the outer diameter side, and the cross-sectional shape of each opening is inclined toward the circuit board direction. 3. A mechanical unit is fixed to the disc tray via a bottom plate member that covers the lower surface of the mechanical unit,
A bent portion is provided on the lower surface of the bottom plate member, and a conductive elastic member for grounding is arranged on the bottom surface of the lower case that forms the bottom of the housing. When the mechanical unit is housed in the housing. The optical disk device according to claim 1 or 2, wherein the bottom plate member is configured to be grounded to the conductive elastic member via the bent portion. 4. The bent portion on the lower surface of the bottom plate member and the elastic member on the inner bottom surface of the lower case are respectively located on the front side and the rear side of the disc tray when the mechanical unit is housed in the housing. The optical disk device according to claim 1, wherein the optical disk device is arranged. 5. A plurality of grooves are formed on the upper surface of an upper case constituting the top plate of the housing, the grooves having a shape radially curved from the position corresponding to the center of the optical disk toward the outer diameter direction. The optical disk device according to claim 1, 2, 3, or 4.