JP2882379B2 - Optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, and more particularly to an optical disk device in which the adverse effect of heat generated with the operation of a spindle motor is reduced, and the occurrence of a deformation such as a tilt deformation on the optical disk is effectively reduced.

[0002]

2. Description of the Related Art Conventionally, an optical disk device has been disclosed in Japanese Patent Application Laid-Open Nos. Hei 5-054349 and Hei 4-214281.
There are various types as disclosed in Japanese Patent Application Laid-Open Publication No. HEI 10-86, 1988. On the other hand, the spindle motor for driving the optical disk provided in the optical disk device is also a heat source like other motors. For this reason, conventionally, since the optical disc is deformed by the heat generated in the spindle motor, how to suppress the deformation (increase in the amount of tilt) of the optical disc is an important issue in maintaining the performance of the apparatus. I have.

FIGS. 6 to 8 show a conventional example. 6 and 7 show an optical disk 100 storing predetermined information and a turntable 51 holding the optical disk 100 by an annular holder 51A provided around the optical disk 100.
And the turntable 51 via a rotation shaft 52A disposed through the center of rotation of the turntable 51.
And a spindle motor 52 for rotationally driving the motor.

Further, in this conventional example, the aforementioned rotary shaft 52A
A guide member 53 fixed to the distal end of the turntable 5 and having a cylindrical guide surface 53A;
1 and a disc center position adjusting member 54 guided by the guide surface 53A of the guide member 53 and reciprocally movable along the rotation shaft 52A. A spring member 55 that constantly presses the guide member 53 is provided.

After the center position of the optical disk 100 is specified by the disk center position adjusting member 54, the optical disk 100 is held on the turntable 51 by a clamper 56 having a U-shaped cross section.
7, reference numeral 57 denotes an optical head, and reference numeral 58 denotes a head carrier for guiding the optical head 57 along the radial direction of the optical disc 100. Reference numeral 59
Indicates a guide for the head carrier 58.

Here, in the conventional example shown in FIGS. 6 and 7, the clamper 56 is formed of a member having a low thermal conductivity made of a synthetic resin or rubber material, and the other constituent members are made of a heat-resistant material such as an aluminum alloy. It is formed of a member having high conductivity. For this reason, the strength is configured such that the durability is increased as a whole.

[0007] On the other hand, in recent years, an arrangement shown in FIG. 8 has been known to improve such inconvenience. In the conventional example shown in FIG. 8, the guide member 53 and the disk center position adjusting member 54 shown in FIG. 6 are formed of a member having a high thermal conductivity such as an aluminum alloy. The guide member 63 and the disk center position adjusting member 64 are made of the same synthetic resin or rubber-based material having low thermal conductivity.

Further, on the contact surface of the turntable 61 with the above-mentioned optical disk 100, an annular contact member 6 made of a synthetic resin or rubber material and having a low thermal conductivity is used.
1A is attached, thereby effectively preventing the heat of the spindle motor 52 from being transmitted to the optical disc 100. The other configuration is the same as the above-described conventional example of FIG.

There are various other methods for preventing the optical disk 100 from being thermally deformed. For example, Japanese Patent Application Laid-Open No. Hei 5-189950 (which uses a cooling fan to suck heat inside the apparatus to reduce the temperature rise inside the apparatus) and Japanese Patent Application Laid-Open No. 4-268283 ( The natural flow of air between the inside of the apparatus and the outside world reduces the temperature rise inside the apparatus.)
No. 194 (this is to provide the device with cooling fins,
Which promotes heat dissipation in the device).

Japanese Patent Application Laid-Open Nos. 5-110940, 5-105439, and 5-104349 disclose the prior art which focuses on heat radiation at a portion generated when an optical head slides on an optical disk in the apparatus. There are JP-A-4-1214281 and JP-B-60-017054.

In this case, in Japanese Patent Application Laid-Open No. 5-110940, a plastic rotating member mounting shaft, which is a portion where sliding occurs, is hollow or hollow and has fins. In Japanese Patent Application Laid-Open No. H05-54349, a cooling fin is provided on a magnetic head where sliding occurs, and the head is attached to a rotating drum via a filler. JP-A-4-2
In Japanese Patent No. 14281, a rotating shaft made of metal or plastic and a metal supporting base provided on a base plate holding the rotating shaft are used for a rotating shaft supporting a rotating roller which is a part where sliding occurs. In contact. In Japanese Utility Model Publication No. 60-017054, a material having a high thermal conductivity such as sapphire is used in a portion of the magnetic head where sliding occurs, which is in contact with the magnetic tape. Then, the heat radiation effect is increased.

[0012]

However, among the above-mentioned prior arts, those shown in FIGS. 6 and 7 show that the heat of the spindle motor 52 passes through the rotary shaft 52A as indicated by the arrow, and the turntable is turned on. The light is immediately transmitted to the optical disk 100 via the guide member 53, the guide member 53, and the disk center position adjusting member 54. As a result, although the strength is excellent,
The optical disc 100 is disadvantageously easily deformed as a whole by heat.

In the conventional example shown in FIG. 8, the inconvenience of the conventional example shown in FIG. 6 is improved, but on the other hand, the clamper 56 for directly holding the optical disk 100 and the annular contact member 61A on the turntable 61 side. (Optical disk 100
Is made of a material having a low thermal conductivity, frictional heat is locally stored in the contact portion (particularly, the contact surface) between the turntable 61 and the clamper 56 and the optical disc 100, and Due to the optical disk 1
However, there has been a disadvantage that the thermal deformation is locally caused by the heat treatment.

On the other hand, in another conventional example (publication) described above,
Since the heat radiating means focuses on the heat radiating of the portion generated due to the sliding of the optical head, it cannot deal with the inconvenience shown in FIG. 8 at all.

Further, in the conventional example shown in FIG. 8, since the guide member 63 and the disk center position adjusting member 64 are formed of a synthetic resin or rubber-based material having a low thermal conductivity, the guide member 63 and the disk center position adjusting member 64 have a small thermal conductivity. The sliding friction is large, and therefore, the operation of the disk center position adjusting member 64 lacks quickness. Therefore, the centering of the optical disk 100 at the time of assembling is performed more in comparison with the conventional example of FIG. There was a problem that it took time.

[0016]

An object of the present invention is to provide an optical disk device which solves the disadvantages of the prior art, and in particular, reduces local thermal deformation of the optical disk, thereby improving the durability and reliability of the entire device. That is its purpose.

[0017]

According to a first aspect of the present invention, there is provided an optical disk for storing predetermined information, and a turntable for holding the optical disk by an annular holding portion provided around the optical disk. A spindle motor that drives the turntable to rotate through a rotation shaft disposed through the center of rotation of the turntable, and a guide member that is fixed to the tip of the rotation shaft and that has a cylindrical guide surface. A disk center position adjusting member disposed between the guide member and the turntable and guided by the guide surface of the aforementioned guide member and reciprocally movable along a rotation axis; and a disk center position adjusting member. A spring member that constantly presses the optical disk toward the guide member, and an optical disk whose center position is specified by the disk center position adjusting member And a clamper for holding together support member.

Among these, the clamper is formed of a member having a low thermal conductivity such as plastic, and a peripheral portion thereof is formed of a member having a high thermal conductivity such as an aluminum alloy facing the annular holding member of the turntable. I do.

The annular holding member of the turntable is formed by an annular spacer made of an elastic material such as rubber and an annular member provided on the optical disk side of the annular spacer and made of a member having a high thermal conductivity. Configuration.

Therefore, according to the first aspect of the present invention,
First, the optical disk is set on the turntable,
It is sandwiched between the turntable and the clamper.
At the same time, the center position is specified by the operation of the disk center position adjusting member, and the center position is specified and is rotated by the spindle motor.

Next, in actual operation, for example, C
In the case where the rotation speed of the spindle motor constantly changes, such as in a D-ROM drive, a large rotation force is applied to the turntable when the rotation speed changes. As a result, the instantaneous change in the rotational force in the rotational direction is absorbed, so that no slip phenomenon occurs between the optical disk and the turntable, and thus no frictional heat is generated.

Further, since the optical disk is held by a member having a high thermal conductivity, the heat storage which has been locally generated on the surface of the optical disk due to internal friction or the like in the prior art is effectively dissipated by the action of these holding members. Is done.

Therefore, according to the first aspect of the invention, it is possible to effectively reduce the occurrence of tilt deformation and the like of the optical disk due to frictional heat and the like generated on the contact surface of the optical disk with the turntable. .

According to a second aspect of the present invention, in the optical disk device according to the first aspect, the turntable, the guide member, and the center position adjusting member for the disk are each made of a lightweight and high thermal conductivity member such as an aluminum alloy. The turntable, the guide member, and the center position adjusting member for the disk are provided with cylindrical spacers made of a member having a small thermal conductivity on a surface that abuts against the above-mentioned rotating shaft. To do.

Therefore, according to the second aspect of the present invention,
In addition to functioning in the same manner as in the first aspect of the invention, in particular, heat generated by the spindle motor propagates to the optical disk via the rotating shaft, but most of the heat is insulated by the cylindrical spacer, and Does not propagate to the turntable, the guide member, and the center position adjusting member for the disk. For this reason, the component of heat transmitted from the spindle motor to the optical disk via the rotating shaft is drastically reduced. At this point, deformation of the optical disk due to heat is effectively prevented in advance.

According to a third aspect of the present invention, in the optical disk apparatus of the first aspect, each of the turntable, the guide member, and the center position adjusting member for the disk is made of a lightweight and large thermal conductivity member such as an aluminum alloy. And a cylindrical spacer made of a member having a small thermal conductivity and being slidable on the rotating shaft is fixedly attached to a contact surface of the disk center position adjusting member with the rotating shaft. , Is adopted.

Therefore, according to the third aspect of the present invention,
In addition to functioning substantially the same as the first aspect of the present invention, the number of parts can be reduced, and productivity and cost reduction can be expected.

According to a fourth aspect of the present invention, in the optical disk device of the first aspect, the turntable and the center position adjusting member for the disk are each formed of a lightweight and high thermal conductivity member such as an aluminum alloy. At the same time, the above-mentioned guide member is formed of a member having a low thermal conductivity such as plastic. Then, on the contact surface of the disk center position adjusting member with the above-mentioned rotating shaft, a tubular spacer made of a member having a small thermal conductivity is fixedly mounted so as to be slidable on the rotating shaft. Has been adopted.

Therefore, in the invention according to claim 4,
In addition to functioning in the same manner as the first aspect of the present invention, the heat transfer path from the spindle motor to the heat shield can be almost completely shut off by the heat shut-off member. Can be blocked.

According to a fifth aspect of the present invention, in the optical disk device of the first aspect, the turntable and the guide member are each formed of a lightweight and high thermal conductivity member such as an aluminum alloy. Further, the disk center position adjusting member is constituted by an annular skirt member which engages with a through hole at the center of the optical disk and has a conical periphery and a position adjusting body which holds the annular skirt member. .

The position adjusting section body is formed of a member having a small thermal conductivity such as plastic, and the annular skirt member is formed of a lightweight and high thermal conductivity member such as an aluminum alloy. I am taking it.

Therefore, according to the fifth aspect of the present invention,
The heat transfer path from the spindle motor can be almost completely shut off by the heat shut-off member, and in this respect, a function equivalent to the above-described invention of claim 4 can be obtained.

According to a sixth aspect of the present invention, in the optical disk device of the fifth aspect, the cylindrical surface of the position adjusting portion main body is slidably slidable with respect to the rotary shaft. And a cylindrical spacer made of a member having a high thermal conductivity is fixedly mounted.

Therefore, in the invention according to claim 6,
In addition to functioning equivalently to the above-described invention, the center position adjusting member for the disk can be moved more smoothly along the rotation axis, and the operation of mounting the optical disk can be speeded up. There is.

According to a seventh aspect of the present invention, in the optical disk device of the third, fourth, fifth, or sixth aspect, the center of the turntable has a cylindrical and heat-contacting surface with the rotating shaft. A configuration is adopted in which a cylindrical spacer made of a member having low conductivity is provided.

Therefore, according to the invention of claim 7,
The transfer of heat from the spindle motor to the turntable can be completely prevented, and at this point the amount of heat released from the spindle motor is also reduced, so that the transfer of heat through the space around the optical disk is also effectively prevented. It has the advantage of being able to do this.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] Hereinafter, a first embodiment of the present invention will be described with reference to FIG. Here, the same reference numerals are used for the same components as those in the above-described conventional example.
FIG. 1 shows an optical disk 10 in an optical disk device.
The part which holds 0 and is driven to rotate is shown.

In FIG. 1, reference numeral 11 denotes a turntable. The turntable 11 is provided around its periphery with an annular holding member 11A that holds the center of the optical disc 100 upward in FIG. Also,
At the center of rotation of the turntable 11, a rotary shaft 52A of a spindle motor that penetrates from below and integrally holds the turntable 11 is disposed. Thus, the spindle motor can apply a predetermined rotational force to the optical disc 100 via the turntable 11.

A disc-shaped guide member 12 is fixedly provided at the tip of the rotary shaft 52A of the spindle motor.
The disc-shaped guide member 12 is formed so that the periphery of the upper end portion protrudes in a skirt shape (a truncated cone shape) toward the outer peripheral direction,
Around this lower end, a skirt-like projection 1
A cylindrical guide surface 12A having a diameter smaller than 2B is provided. When the disk center position adjusting member 13 described later moves unnecessarily upward along the cylindrical guide surface 12A, the skirt-shaped protrusion 12B can function as a stopper.

A disc center position adjusting member 13 is disposed between the guide member 12 and the turntable 11. This disk center position adjusting member 13
Is formed in a disk shape having a recess 13U at the center of the upper surface of FIG. 1, and the inner surface of the recess 13U is a sliding inner surface 13Ua smoothly engaged with the cylindrical guide surface 12A of the guide member 12 described above. Has formed. Thus, the disk center position adjusting member 13 can move up and down along the cylindrical guide surface 12A of the guide member 12.

Reference numeral 15 denotes a coil spring as a spring member that constantly presses the disk center position adjusting member 13 toward the guide member 12 side. Although the coil spring 15 is provided with one coil spring having a large diameter, the coil spring 15 may be replaced with a plurality of coil springs having a small diameter.
Further, it may be formed of a leaf spring.

Here, the turntable 11, the guide member 12, and the disk center position adjusting member 13 described above.
In the present embodiment, is formed of a member having a high thermal conductivity such as an aluminum alloy or stainless steel. Therefore, the heat transmitted to the turntable 11, the guide member 12, and the disk center position adjusting member 13 is radiated to the outside without being stored.

Reference numeral 16 denotes a clamper having a U-shaped cross section and having an opening on the lower side. The clamper 16 is formed of a member having low thermal conductivity such as plastic. Therefore, heat is hardly transmitted to the clamper 16.

The clamper 16 is for setting the optical disk 100 whose center position has been specified by the disk center position adjusting member 13 to a spindle motor, and is disposed on the upper side of the turntable 11 in FIG. An annular clamp member 16A for holding the optical disc 100 in cooperation with the above-described annular holding member 11A is provided. This annular clamp member 16A is formed of a member having a high thermal conductivity.

Further, an annular plate 16M made of a magnetic member (for example, made of iron) is fixedly mounted on the inner surface of the clamper 16 so as to face the disc-shaped guide member 12 on a concentric axis. Further, facing the annular plate 16M, the aforementioned guide member 12 is provided with an annular permanent magnet 12M. Reference numeral 16a denotes a clamper 16
3 shows a projection for alignment formed at the center of FIG. The protrusion 16a is connected to the rotation shaft 5 of the spindle motor described above.
It engages with a guide hole 52a formed at the tip of 2A, so that when the optical disk 100 is attached or detached, the positioning operation of the clamper 16 can be performed quickly and with high accuracy.

The above-described annular holding member 11A of the turntable 11 includes an annular spacer 11Aa made of an elastic material having a low thermal conductivity such as a rubber material or a synthetic resin, and an aluminum spacer mounted on the optical disk 100 side of the annular spacer 11Aa. An annular member 11Ab made of a material having a high thermal conductivity such as an alloy or stainless steel.

Here, the above-described turntable 11, guide member 12, and disk center position adjusting member 13 are used.
The cylindrical spacer 11 made of a member having a low thermal conductivity and a cylindrical shape is provided on a surface portion that comes into contact with the rotation shaft 52A.
E, 12E and 13E are provided respectively. In this case, the rotary shaft 52A and the turntable 11 are integrated via the cylindrical spacer 11E, and the rotary shaft 52A and the guide member 12 are integrated via the cylindrical spacer 12E. On the other hand, the cylindrical spacer 13E is integrated with the disk center position adjusting member 13 so that the rotary shaft 52A can move up and down together with the disk center position adjusting member 13.

Next, the operation of the first embodiment will be described.

First, the optical disc 100 is set on the turntable 11, and the annular holding member 11A of the turntable 11 and the annular clamp member 16 of the clamper 16 are set.
And A. At the same time, the center position is specified by the action of the disk center position adjusting member 13 and the coil spring 15, and the center position is specified, and the disk is rotated by the spindle motor.

Next, in actual operation, for example, C
In the case where the rotation speed of the spindle motor constantly changes, such as in a D-ROM drive, a large rotation force is applied to the turntable 11 when the rotation speed changes. However, in the first embodiment, since the annular spacer 11Aa of the annular holding member 11A is formed of an elastic material, a large instantaneous torque is absorbed by the deformation of the annular spacer 11Aa in the rotational direction. As a result, no relative movement (i.e., "slip phenomenon") occurs between the optical disk 100 and the annular member 11Ab, and therefore no frictional heat is generated.

On the other hand, in this case, the optical disc 100 and the annular holding member 11 of the turntable 11 holding the optical disc 100 are held.
No relative movement occurs on the contact surface between the ring member A and the annular clamp member 16A of the clamper 16, but a small amount of internal stress is generated and comes out as minute heat, but the annular member 11Ab of the annular holding member 11A and the annular member Since the clamp member 16A and the clamp member 16A are formed of a member having a large thermal conductivity, the minute heat is distributed to the annular member 11Ab and the annular clamp member 16A without staying on the surface of the optical disc 100,
Therefore, the local heat storage of the optical disc 100 and the accompanying deformation are effectively prevented in advance.

On the other hand, heat generated by the spindle motor propagates through the rotation shaft 52A to the optical disk 100 side. Most of the heat is insulated by the above-described cylindrical spacers 11E, 12E and 13E, and the turn supporting the optical disk 100 is turned on. The light does not propagate to the table 11, the guide member 12, and the disk center position adjusting member 13. Therefore, the heat of the spindle motor is transferred to the optical disk 1 via the rotation shaft 52A.
The component transmitted to 00 is drastically reduced, and at this point, the deformation of the optical disc 100 due to heat is effectively prevented in advance.

[Second Embodiment] Next, a second embodiment of the present invention will be described.
An embodiment will be described with reference to FIG.

In the second embodiment shown in FIG. 2, the cylindrical spacers 11E, 12E provided in the turntable 11 and the guide member 12 in the first embodiment described above.
And the turntable 11 and the guide member 12 are directly fixed to the rotation shaft 52A. Other configurations are the same as those of the embodiment of FIG. 1 described above.

Even in this case, the overall operation and the heat shut-off operation for the optical disk 100 can be substantially the same as those in the first embodiment.

That is, the heat of the spindle motor transmitted through the rotation shaft 52A is transmitted to the turntable 11 and the guide member 12, but the turntable 11
The heat component directly transmitted to the optical disc 100 is reliably shut off by the heat insulating action of the annular spacer 11Aa provided around the optical disc 100.

Although the heat of the spindle motor is transmitted to the guide member 12 as it is, the heat is transmitted from the guide member 12 to the optical disk 100 via the disk center position adjusting member 13. Has become. In this case, although the disk center position adjusting member 13 is in line contact with the optical disk 100, the heat transfer is greatly reduced because of the line contact.

Further, in the second embodiment, since the cylindrical spacers 11E and 12E are not required, the number of parts is reduced as compared with the embodiment shown in FIG.
For this reason, the assembling work is reduced, and there is an advantage that cost reduction and productivity improvement can be achieved in this respect. Other functions and effects are the same as those of the first embodiment.

[Third Embodiment] Next, a third embodiment of the present invention will be described.
The embodiment will be described with reference to FIG.

The third embodiment shown in FIG. 3 is characterized in that the guide member 12 is formed of a member having a low thermal conductivity such as a synthetic resin in the second embodiment described above. Other configurations are the same as those of the above-described second embodiment (FIG. 2). Even in this case, in addition to having the same operation and effect as the above-described second embodiment (FIG. 2), since the guide member 12 is formed of a member having a small thermal conductivity such as a synthetic resin, the guide member 12 is formed. Therefore, the heat transmission path directly transmitted to the optical disk 100 via the optical disk 100 can be effectively cut off, so that the heat transmission to the optical disk 100 is further greatly reduced, and the occurrence of heat deformation of the optical disk 100 is further reduced. be able to.

[Fourth Embodiment] Next, a fourth embodiment of the present invention will be described.
Will be described with reference to FIG.

The fourth embodiment shown in FIG. 4 is different from the third embodiment in that the center of the turntable 11 and the contact surface with the rotating shaft 52A are cylindrical and have a thermal conductivity. The feature is that a cylindrical spacer 11E made of a member having a small size is provided. The other configuration is the same as that of the third embodiment shown in FIG.

In this manner, the same operation and effect as those of the third embodiment (FIG. 3) described above can be obtained, and further, heat can be transmitted to the turntable 11 by the cylindrical spacer 11.
E, for example, the annular spacer 11A
It is possible to select and use the most suitable elastic member without regard to a heat insulating property, and in this respect, work sharing works effectively to further improve the durability and reliability of the entire device. There is an advantage that can be.

[Fifth Embodiment] Next, a fifth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. The fifth embodiment shown in FIG. 5 is different from the first embodiment described above in that
The cylindrical spacers 12E and 13E provided in the guide member 12 and the disk center position adjusting member 13 in the first embodiment described above are eliminated, and the guide member 12 is removed.
Are fixedly mounted directly on the rotating shaft 52A.

Further, the fifth embodiment is different from the first embodiment in that the disk center position adjusting member 1 is different from the first embodiment.
3 is an annular skirt member 1 which is engaged with a through hole 100A at the center of the
3A and a position adjusting portion main body 13B that holds the annular skirt member 13A. The position adjusting section main body 13B is formed of a member having a low thermal conductivity such as plastic, and the annular skirt member 13A is formed of a lightweight and high thermal conductivity member such as an aluminum alloy. I have. Other configurations are the same as those of the first embodiment (see FIG. 1).

For this reason, in the fifth embodiment, the heat transmitted from the spindle motor via the rotary shaft 52A is transmitted only to the guide member 12, and the turntable 11 is provided with the cylindrical spacer 11E. And is not transmitted to the disk center position adjusting member 13 because the material is a member having low thermal conductivity. On the other hand, between the guide member 12 and the optical disk 100, the above-described position adjusting portion main body 13B of the disk center position adjusting member 13 is interposed.
Is formed of a member having a small thermal conductivity. For this reason,
The heat transmitted to the guide member 12 is also transmitted to the position adjusting section main body 1.
3B, the light is not transmitted to the optical disc 100.

For this reason, in the fifth embodiment, it is possible to effectively prevent the heat from the spindle motor from being directly transmitted to the optical disk 100. At this point, the deformation of the optical disk 100 due to the heat is previously effective. Has been prevented.

Here, in the fifth embodiment, the case where the turntable 11 is provided with the cylindrical spacer 11E has been exemplified. However, the cylindrical spacer 11E is omitted, and the turntable 11 is moved to the rotating shaft 52A. It may be fixedly installed directly on the vehicle. In this case, the motor heat transmitted to the turntable 11 via the rotating shaft 52A is transmitted to the turntable 11
Is cut off by the heat insulating effect of the annular spacer 11Aa provided at the peripheral end of the optical disk 100 and does not directly transmit to the optical disc 100.

[Sixth Embodiment] Next, a sixth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. The sixth embodiment shown in FIG. 6 is different from the fifth embodiment described above in that
A member (for example, aluminum alloy or stainless steel) that slidably abuts on the rotating shaft 52A and has low thermal conductivity on the abutting surface of the position adjusting body 13B of the disk center position adjusting member 13 with the rotating shaft 52A. Etc. metal)
It is characterized in that a cylindrical spacer 13F made of is fixedly provided. Other configurations are the same as those of the above-described fifth embodiment (see FIG. 5).

In this manner, the same operation and effect as those of the fifth embodiment are obtained, and the vertical movement (sliding operation along the rotating shaft 52A) of the disk center position adjusting member 13 is further smoothed. Therefore, there is an advantage that the work of mounting the optical disc 100 can be performed smoothly and the durability of the entire apparatus can be improved.

Here, in the sixth embodiment, the case where the turntable 11 is provided with the cylindrical spacer 11E has been exemplified. However, as in the case of the fifth embodiment described above, this cylindrical member is used. The spacer 11E may be omitted, and the turntable 11 may be fixedly mounted directly on the rotating shaft 52A.

[0072]

The present invention is constructed and functions as described above. According to this, especially when the rotational speed of the spindle motor constantly changes (start / stop is repeated), a large rotational force is applied. Is repeatedly applied to the turntable. In such a case, the instantaneous large rotational force is absorbed by the elastic deformation of the annular spacer on the turntable side, whereby relative movement (ie, "slip phenomenon") occurs between the optical disk and the annular member. No heat is generated, and therefore no frictional heat is generated. For this reason, according to the present invention, it is possible to effectively suppress the occurrence of tilt deformation and the like of the optical disk due to frictional heat which has conventionally occurred on the contact surface of the optical disk with the turntable.

According to the present invention, as described above, the heat transmitted from the spindle motor to the optical disk can be effectively blocked as described above before the motor heat is transmitted to the optical disk. At this point, tilt deformation of the optical disc due to heat generated by the motor during operation can be effectively prevented.

Further, according to the present invention, the internal stress (or internal strain) is locally generated in each member together with the operation of starting and stopping the turntable, and this is generated on the surface of the member as minute heat. According to the present invention, since all the members in contact with the optical disk are formed of members having high thermal conductivity, all the minute heat applied on the surface of the optical disk is diffused and radiated by the member having high thermal conductivity. An excellent optical disk device that is not conventionally available, in which no local heat storage state is generated on the surface of the optical disk, and even in this respect, thermal deformation of the optical disk can be effectively avoided and normal reading or writing operation can be maintained for a long time. Can be provided.

[Brief description of the drawings]

FIG. 1 is a partially omitted sectional view showing a first embodiment of the present invention.

FIG. 2 is a partially omitted sectional view showing a second embodiment of the present invention.

FIG. 3 is a partially omitted sectional view showing a third embodiment of the present invention.

FIG. 4 is a partially omitted sectional view showing a fourth embodiment of the present invention.

FIG. 5 is a partially omitted cross-sectional view showing a fifth embodiment of the present invention.

FIG. 6 is a partially omitted cross-sectional view showing a sixth embodiment of the present invention.

FIG. 7 is a partially omitted cross-sectional view showing a conventional example.

8 is a schematic configuration diagram showing the entire apparatus including the conventional example of FIG. 7;

FIG. 9 is a partially omitted cross-sectional view showing another conventional example.

[Explanation of symbols]

 Reference Signs List 11 turntable 11A annular holding member 11Aa annular spacer 11Ab annular member 11E, 12E, 13E, 13F cylindrical spacer 12 guide member 12A guide surface 13 disk center position adjustment member 13A annular skirt member 13B position adjustment portion main body 15 spring member Coil spring 16 Clamper 16A Annular clamp member 52A Rotating shaft 100 Optical disk

Claims (7)

(57) [Claims] 1. An optical disk for storing predetermined information, a turntable for holding the optical disk by an annular holding portion provided around the optical disk, and a rotation shaft disposed through a rotation center of the turntable. A spindle motor that rotationally drives the turntable, and a guide member that is fixed to the tip of the rotation shaft and that has a cylindrical guide surface,
A disk center position adjusting member disposed between the guide member and the turntable and guided by a guide surface of the guide member and reciprocally movable along the rotation axis; and a disk center position adjusting member. An optical disc device comprising: a spring member that constantly presses the disc member toward the guide member side; and a clamper that holds the optical disc whose center position is specified by the disc center position adjustment member together with the annular holding member of the turntable. An annular clamp member made of a member having a high thermal conductivity, such as an aluminum alloy, is provided on an outer peripheral portion thereof, which is formed of a member having a low thermal conductivity such as plastic and is opposed to the annular holding member of the turntable. An annular spacer made of an elastic material such as rubber is used as an annular holding member of the turntable. Optical disc apparatus characterized by being configured by an annular member disposed on the optical disk side of the Jo spacer made from a large member of the thermal conductivity. 2. The turntable, the guide member, and the center position adjusting member for the disk are each formed of a lightweight and high thermal conductivity member such as an aluminum alloy, and the turntable, the guide member, and the disk. 2. The optical disk apparatus according to claim 1, wherein a cylindrical spacer made of a member having a low thermal conductivity such as plastic is provided on a surface of the center position adjusting member which abuts on the rotating shaft. 3. The turntable, the guide member, and the center position adjusting member for the disk are each formed of a lightweight and high thermal conductivity member such as an aluminum alloy, and the rotating shaft of the center position adjusting member for the disk is provided. 2. The optical disk device according to claim 1, wherein a cylindrical spacer made of a member having a small thermal conductivity is fixedly mounted on a contact surface with the cylindrical member so as to be slidable on the rotating shaft. 4. The turntable and the disk center position adjusting member are each formed of a lightweight and high thermal conductivity member such as an aluminum alloy, and the guide member is formed of a member having a low thermal conductivity such as plastic. The disk center position adjusting member is provided with a cylindrical spacer made of a member having a small thermal conductivity and slidably attached to the rotating shaft, on a contact surface of the disk center position adjusting member with the rotating shaft. The optical disk device according to claim 1, wherein: 5. The turntable and the guide member are each formed of a lightweight and high thermal conductivity member such as an aluminum alloy, and the disk center position adjusting member is engaged with a through hole at the center of the optical disk. An annular skirt member whose periphery is formed in a conical shape, and a position adjusting portion main body holding the annular skirt member, and the position adjusting portion main body is formed of a member having a low thermal conductivity such as plastic. 2. The optical disk apparatus according to claim 1, wherein said annular skirt member is formed of a lightweight and high thermal conductivity member such as an aluminum alloy. 6. A cylindrical spacer made of a member having a high thermal conductivity and slidably abutting on the rotating shaft is provided on a contact surface of the position adjusting portion main body with the rotating shaft. The optical disk device according to claim 5, wherein 7. A cylindrical spacer made of a member having a low thermal conductivity, such as plastic, is provided on a contact surface of the turntable with the rotating shaft at a central portion of the turntable. 7. The optical disk device according to 3, 4, 5, or 6.