JP3479207B2 - Disk rotation drive - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotation drive device for rotationally driving a disk such as a compact disk or a digital video disk, and more particularly to a chucking mechanism for holding the disk in a rotationally drivable state. It is a thing.

[0002]

2. Description of the Related Art A disk rotation drive device for rotating a disk such as a compact disk is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 3 (1999) -311.
No. 157859. The disk rotation drive device disclosed in this publication includes a motor,
This motor is provided with a chucking mechanism for holding the disk in a rotationally drivable state.

In this chucking mechanism, as shown in FIG. 7A, the center hole D1 of the disk D is centered 3
When it is fitted to 0, the inner peripheral portion 303 of the central hole D1 becomes the steel ball 30.
The steel ball 301 is moved to the inside by abutting on 1. As a result, the steel ball 301 elastically deforms the rubber O-ring 302. Then, as shown in FIG. 7B, when the disk D is completely placed on the turntable 31A, the steel ball 301
Contacts the upper peripheral edge D12 of the central hole D1, so that the O-ring 302 aligns the center of the disk D with the rotating shaft (not shown) of the motor through the steel ball 301 and restores its shape. Disc D by force
Is pressed and supported toward the turntable 31A.

[0004]

However, in the conventional chucking mechanism, the steel ball 301 pressed by the O-ring 302 causes the centering (alignment) of the disk D and the pressing of the disk D on the turntable 31A. Since the support is performed, if the elasticity of the O-ring 302 differs depending on the location, the center position of the disc D is fixed and fixed on the turntable 31A to reproduce information.
There is a problem that recording becomes impossible.

An object of the present invention is to propose a disk rotation drive device which can eliminate the above-mentioned deviation of the center position and can always perform appropriate chucking of the disk.

[0006]

In order to solve the above problems, in a disk rotation drive device according to the present invention, a rotor assembly including a turntable on which a disk having a central hole is placed, and the rotor assembly. Is held so as to be movable in the axial direction above, and is biased in a direction away from the turntable, and when the disc is placed on the turntable, the lower peripheral edge of the center hole comes into contact with the turntable. A disc aligning member that sinks into the turntable side to center the disc and the disc aligning member engages with the disc aligning member until the disc is placed on the turntable. It is equipped with a disc pressing part that is retracted to a position that does not hinder the placement of the disc, and the disc is placed on the turntable. When the disc aligning member is depressed during engagement, the engagement between the disc aligning member and the disc pressing portion is released, and the disc pressing portion elastically moves the upper peripheral edge of the center hole toward the turntable. Yes a disk fixing member configured on the rotor assembly to come appeared in a position to press
However, the disc fixing member of the rotor assembly is
The ring shape loosely fitted to the cylindrical part or the cylindrical part
By having a radial on the rotor assembly
It is characterized in that it can be displaced in any direction .

In the disk rotation drive device according to the present invention, when the disk is lowered onto the turntable, the disk aligning member biased in the direction away from the turntable is the lower peripheral edge of the central hole of the disk. Abut
Center the disc while sinking to the turntable side. On the other hand, the disc pressing portion is retracted to a position where it does not hinder the placement of the disc on the turntable by the engagement with the disc aligning member until the disc is placed on the turntable. When the engagement with the disc alignment member is released due to the depression of the disc alignment member when the disc is placed on the table,
The disc pressing portion appears at a position where the upper peripheral edge of the center hole of the disc is elastically pressed toward the turntable. As a result, the centering of the disc is surely performed by the disc aligning member, and the disc is securely fixed on the turntable by the disc fixing member.
That is, the disc aligning member is responsible only for the centering out of the centering of the disc and the fixing of the disc on the turntable, so that the structure suitable for centering can be obtained. Further, even if the upper peripheral edge and the lower peripheral edge are displaced from each other in the center hole of the disk, the disk aligning member reliably performs centering of the disk with the lower peripheral edge of the center hole of the disk as a reference. Therefore, in a digital video disk or the like composed of bonded substrates, even if the position of the central hole is deviated between the bonded two substrates, the disk aligning member is located below the turntable. The center of the disk is centered on the lower edge of the central hole of the substrate (the substrate on which the head is arranged), that is, the substrate on which the pit information is formed in the digital video disc. Therefore, in the chucking mechanism of the disc rotation drive device to which the present invention is applied, unlike the case where the center of the disc is centered on the center hole of the upper substrate located on the side opposite to the turntable side of the digital video disc. Thus, it is possible to surely reproduce or record information from the digital video disc. Further, in the present invention, the disc pressing portion is retracted to a position that does not hinder the placement of the disc on the turntable by the engagement with the disc aligning member until the disc is placed on the turntable. Therefore, when the disc is placed on the turntable, the disc pressing portion does not touch the central hole of the disc at all or only touches it lightly. Therefore, when placing the disc on the turntable, it is only necessary to lightly press the disc toward the turntable, so the disc will not be distorted even if the disc is repeatedly placed on the turntable. .

Further , in the present invention, the disk fixing member is a cylindrical portion of the rotor assembly or a cylindrical shape.
By having a ring shape that is loosely fitted to the part , it can be displaced in either radial direction on the rotor assembly . Therefore, even if the position of the central hole is deviated between the two substrates constituting the digital video disc, the disc fixing member is accurately centered by the disc aligning member with reference to the central hole of the lower substrate. It automatically shifts to the position corresponding to the position of the center hole of the upper substrate of the digital video disc in the closed state. Therefore, the disc fixing member securely fixes the digital video disc on the turntable without shifting the center position of the digital video disc.

In the present invention, the disc fixing member is provided with the disc pressing portions at a plurality of positions, and elastically deforming portions for elastically pressing the plurality of disc pressing portions at the upper peripheral edge of the center hole independently of each other. It is preferable to provide. Thus, when each disc pressing portion is elastically pressed against the upper peripheral edge of the center hole independently of each other, each disk pressing portion presses the upper peripheral edge of the center hole with an equal force,
The disk fixing member fixes the disk on the turntable in a stable state.

In the present invention, it is preferable that the disc centering member has a ring shape having a plurality of centering portions each having a tapered portion with which a lower peripheral edge of the disc abuts. According to this structure, the disc centering member accurately centers the disc even if the size of the central hole varies from disc to disc.

In some cases, the disc aligning member has a ring shape having an aligning portion consisting of a tapered portion with which the lower peripheral edge of the center hole abuts, and in this case, The processing time of the disk alignment member can be shortened and the manufacturing cost can be reduced.

In the present invention, it is preferable that the centering portion has a height dimension from a position where the lower peripheral edge of the central hole abuts to an upper end portion thereof is 1/2 or less of a thickness dimension of the disc. That is, 2 which constitutes a digital video disc.
Since the thickness of the substrates is substantially equal, the height of the tapered portion from the position where the lower peripheral edge of the center hole of the digital video disk abuts to the upper end is less than or equal to the thickness of the lower substrate. Therefore, the two that make up the digital video disc
Even if the positions of the central holes are deviated between the substrates, the upper end portion of the tapered portion does not touch the upper substrate. Therefore, the disc aligning member accurately centers the digital video disc with the center hole of the lower substrate as a reference without tilting the posture of the digital video disc.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2A are a plan view and a sectional view of a disk rotation drive device to which the present invention is applied, respectively.

In these figures, a disk rotation drive device 1 of the present embodiment is for rotating and driving a disk D such as a compact disk or a digital video disk, and a motor main body 2 and the motor main body 2 are connected to each other. The chucking mechanism 3 holds the chucking mechanism 3 so that the chucking mechanism 3 can be rotationally driven. A head H for reproducing information from and recording information on the disk D is arranged below the disk D.

The motor body 2 is, for example, a brushless motor, and includes a stator assembly 4 and a rotor assembly 5.
Is equipped with. The stator assembly 4 is a motor board 4
1 and a bearing holder 42 fixed to the motor board 41
A cylindrical metal bearing 51 fixed to the inner peripheral surface of the bearing holder 42, a stator core 43 fixed concentrically to the outer peripheral surface of the bearing holder 42, and a coil winding 44 wound around salient poles of the stator core 43. It has and.

On the rotor assembly 5 side, the metal bearing 5
A rotary shaft 52 rotatably supported via 1;
A cup-shaped rotor case 53 coupled to the rotary shaft 52 so as to rotate integrally, and an annular rotor magnet 54 fixed to the inner peripheral surface of the rotor case 53 are provided. The end of the rotary shaft 52 is supported by the thrust bearing 55.

Next, the structure of the chucking mechanism 3 for chucking the disk D will be described. The chucking mechanism 3 is fitted to the disk-shaped turntable 31 fixed concentrically to the tip of the rotary shaft 52 protruding upward from the upper end of the bearing holder 42, and the cylindrical portion 310 protruding upward from the turntable 31. The ring-shaped disc fixing member 32, the lid member 33 that sandwiches the disc fixing member 32 between the turntable 31 and the tip end side of the rotary shaft 52, and restricts the axial movement of the disc fixing member 32; A ring-shaped disc aligning member 34 is formed by utilizing the circumferential groove 300 formed on the upper surface side of the table 31.

The turntable 31 has a thick annular boss 312 around a shaft hole 311 formed in the center thereof.
Is formed, and the rotor case 53 is fixed to the outer periphery of the annular boss 312. Also, turntable 3
The upper surface side of 1 is an annular disk mounting surface 312, and a rubber 313 for preventing slippage of the mounted disk D is attached to the disk mounting surface 312.

The lid member 33 is provided with a cylindrical portion 330 projecting downward at a central portion thereof, and the cylindrical portion 330 is fitted inside the cylindrical portion 310 of the turntable 31, so that the lid member 33 is turned on. It is in a fixed state.

The disc fixing member 32 is provided with a ring-shaped holder 321 having a hole 320 having an inner diameter larger than the outer diameter of the cylindrical portion 310 of the turntable 31 by about 0.4 mm at the center thereof. 32
The cylindrical portion 310 of the turntable 31 is loosely fitted in the first hole 320. Therefore, the disk fixing member 32 is
The amount corresponding to 0.2 mm on one side corresponding to the difference between the inner diameter of the hole 320 of the holder 321 and the outer diameter of the cylindrical portion 310 of the turntable 31 may be displaced in all radial directions. It is possible.

As shown in FIG. 3, the disk fixing member 3
Reference numeral 2 denotes a disk pressing piece 323 (disk pressing portion) at each of three positions in the holder 321 at equal angular intervals, and any of these disk pressing pieces 323 is independently provided on the outer peripheral side of the turntable 31. And a coil spring 324 (elastically deformable portion) that biases the
Here, as shown by arrow A, the disc pressing piece 323 is movable in both the direction of retracting into the holder 321 and the direction of protruding by a predetermined dimension.

Referring again to FIG. 2A, the holder 321
Two stepped portions 32 are formed on the lower end surface of the disc pressing piece 323 which is urged to the outer peripheral side by the coil spring 324 inside.
6, 328 are formed, and these two steps 326, 32 are formed.
8, the tip portion 325 of the disc pressing piece 323
The step 328 located on the side of is a step for engagement that is hooked on the aligning portion 340 protruding upward in the disc aligning member 34 described later in detail. Therefore, as shown in FIG. 2A, the disc pressing piece 323 has the step 328 until the disc D is placed on the turntable 31.
By engaging with the centering portion 340 of the disc centering member 34, the disc is retracted to a position where it does not hinder the placement of the disc D on the turntable 31. Here, the tip portion 325 of the disc pressing piece 323 has a rounded shape.

Referring again to FIGS. 1 and 2A, the disc aligning member 34 centers the disc on the rotary shaft 52 when the disc is placed on the turntable 31, as will be described later. Aligning part 34 for
It is a ring having 0 at each of six positions at substantially equal angular intervals, and the lower half part thereof is fitted in a circumferential groove 300 formed on the upper surface side of the turntable 31 in a vertically movable state. There is. Therefore, the disc aligning member 34 is indicated by the arrow B.
As shown by, it is possible to move in the direction of approaching and separating from the turntable 31. Further, since the coil spring 345 is arranged at the bottom portion of the circumferential groove 300, the disk aligning member 34 is urged by the coil spring 345 in the direction away from the turntable 31.
However, the aligning member 34 is provided with a stopper 345 protruding upward at a position adjacent to the aligning portion 340, and this stopper 345 is in contact with the upper surface portion of the holder 321 of the disc fixing member 32. Therefore, the disk aligning member 34 does not project further toward the tip side of the rotary shaft 52.

In the disc aligning member 34, it is the outer peripheral side surface of the aligning portion 340 that directly abuts the disc D. In the present embodiment, this aligning portion 340 is enlarged and shown in FIG. 4 (A). Further, the taper surface 341 is formed. Here, the aligning portion 340 includes the disk D of the tapered surface 341.
The height dimension T from the position P where the lower peripheral edge D11 of the center hole D1 of the disk abuts to the upper end portion 342 of the centering portion 340 is configured to be 1/2 or less of the thickness dimension t of the disk D. is there. Here, if the disc D is a digital video disc composed of two substrates DA and DB bonded together, the thickness of the two substrates DA and DB is substantially equal to each other. The height dimension T from the position P where the lower peripheral edge D11 contacts to the upper end portion 342 is equal to or smaller than the thickness dimension (t / 2) of the lower substrate DB.

In the disk rotation driving device 1 thus constructed, when the disk D having the center hole D1 is lowered onto the turntable 31, the turntable 3
In the disc aligning member 34 that is urged in the direction away from 1, the lower peripheral edge D11 of the central hole D1 of the disc D contacts the tapered surface 341 of the aligning portion 340, as shown in FIG. Then, the disk D is centered while sinking to the turntable 31 side. On the other hand, the disc pressing piece 323 of the disc fixing member 32 prevents the disc D from being placed on the turntable 31 by engaging with the disc aligning member 34 until the disc D is placed on the turntable 31. Although the disc is retracted to the inner position, the disc aligning member 34 is depressed when the disc D is placed on the turntable 31, so that the step 328 of the disc pressing piece 323 and the aligning of the disc aligning member 34 are aligned. Part 3
When the engagement with the disc 40 is released, the disc pressing piece 32
3 is pushed by the coil spring 324 and appears at a position where the tip portion 325 elastically presses the upper peripheral edge D12 of the center hole D1 of the disk D toward the turntable 31. As a result, the centering of the disc D is surely performed by the disc centering member 34, and the disc D is surely fixed on the turntable 31 by the disc fixing member 32. That is, the disk centering member 34 is responsible only for the centering out of the centering out of the disk D and the fixing of the disk D on the turntable 31, so that the tapered ring made of metal or synthetic resin that does not deform is deformed. It is possible to adopt a structure suitable for centering the disk D, such as by Further, even if the upper peripheral edge D12 and the lower peripheral edge D11 are displaced from each other in the central hole D1 of the disk D, the disk aligning member 34 sets the center of the disk D on the basis of the lower peripheral edge D11 of the central hole D1 of the disk D. Surely.

Further, as shown in FIG. 5 (A), when the digital video disk D composed of the bonded substrates consisting of the two substrates DA and DB is rotationally driven, the two substrates DA bonded to each other are rotated. Even if the positions of the central holes DA1 and DB1 are deviated from each other by a maximum of about 0.15 mm between DB and DB, the chucking mechanism 3 of the disk rotation drive device 1 according to the present embodiment is configured as shown in FIG.
As shown in (B), the disc aligning member 34 has a central hole DA1 of the lower substrate DA (the substrate DA on which the pit information is formed in the digital video disc D) located on the turntable 31 side. The center of the disk D is accurately centered on the basis of the lower peripheral edge DA11. Therefore,
In the chucking mechanism 3 of the disc rotation driving device 1 to which the present invention is applied, the center of the disc D is centered with respect to the central hole DB1 of the upper substrate DB located on the side opposite to the turntable 31 side of the digital video disc D. It is possible to reliably perform information reproduction or information recording from the digital video disc D, unlike the case of performing. That is, although the pit information is formed on the substrate DA in the digital video disc D, as shown in FIG.
Like the chucking mechanism of the conventional disk rotation drive device described with reference to FIGS.
When the center is set on the basis of the upper peripheral edge DB12 of the central hole DB1, the pit information cannot be accurately reproduced or recorded, but such a problem can be solved by the chucking mechanism 3 of the disc rotation drive device 1 of the present embodiment. You can

In the optical pickup device 1 of this embodiment, the disc pressing piece 323 is the turntable 3
Until the disc D is placed on the turntable 31, it is retracted to an inner position that does not hinder the placement of the disc D on the turntable 31 by engagement with the disc aligning member 34. When the disc D is placed, the tip portion 325 of the disc pressing piece 323 does not touch the central hole D1 of the disc D at all, or touches only lightly. Therefore, when the disc D is placed on the turntable 31, it is only necessary to lightly press the disc D toward the turntable 31, and therefore, even if the disc D is placed on the turntable 31 repeatedly, The disk D will not be distorted.

The disk fixing member 32 is a cylindrical portion 310 of the turntable 31 of the rotor assembly 5.
Since it has a ring shape loosely fitted in, it can be displaced on the rotor assembly 5 in either radial direction. Therefore, the disc fixing member 32 automatically shifts to the optimum position corresponding to the position of the center hole D1 of the disc D centered accurately by the disc aligning member 34. Therefore, Digital Video Disc D
Even if the positions of the central holes DA1 and DB1 are deviated between the two substrates DA and DB constituting the digital video disc D when the disk fixing member 32 is mounted,
5B to the position corresponding to the position of the central hole DB1 of the upper substrate DB of the digital video disk D which is accurately centered by the disk centering member 34 with reference to the central hole DA1 of A. As shown by the arrow C, the digital video disc D is automatically displaced, and the digital video disc D is securely fixed onto the turntable 31 without shifting the center position of the digital video disc D.

Further, the disk fixing member 32 is provided with disk pressing pieces 323 at three positions.
The disc pressing pieces 323 are biased by three coil springs 324 independent of each other. Therefore, each coil spring 324 acts so as to press the disk D toward the turntable 31 with an equal force via each disk pressing piece 323, so that the disk D is fixed on the turntable 31 in a stable state. To be done.

Furthermore, the disc aligning member 34 has a tapered portion 340 with which the lower peripheral edge D11 of the disc D abuts.
Since there are multiple centering parts consisting of
Even if the size of 1 is slightly different for each disk D, the disk aligning member 34 accurately centers the disk D.

Moreover, as described with reference to FIG. 4A, in the aligning portion 340, the height dimension T from the position P where the lower peripheral edge D11 of the central hole D1 abuts to the upper end portion 342 is set. The thickness is less than or equal to the thickness dimension (t / 2) of the lower substrate DB. Therefore, as shown in FIG. 4B, even if the positions of the central holes DA1 and DB1 are deviated between the two substrates DA and DB constituting the digital video disc D, the centering portion 3
The upper end portion 342 of 40 does not touch the upper substrate DB. Therefore, the disc aligning member 32 does not tilt the posture of the digital video disc D, and the lower substrate DA
The centering of the digital video disk D is accurately performed with reference to the center hole DA1 of.

(Other Embodiments) In order to displace the disk fixing member 32 on the rotor assembly 5 in any radial direction, for example, in the rotor assembly 5, for example, the rotating shaft 52 (cylindrical column) is used. Part)
Alternatively, the ring-shaped disc fixing member 32 may be loosely fitted to the cylindrical portion 330 of the lid member 33.

The spring arranged in the circumferential groove 300 of the turntable 31 for urging the disc aligning member 34 in the direction away from the turntable 31 is not limited to a coil spring, but a leaf spring or a disc spring. Etc. may be used.

FIGS. 6A, 6B and 6C respectively show
It is a perspective view of various disk fixing members that can be used in the disk rotation drive device of the present embodiment.

All of the disc fixing members shown in FIGS. 6A, 6B and 6C are disc D as shown in FIG.
When the disk has been placed on the turntable 31, the disk pressing piece elastically contacts the upper peripheral edge D12 of the central hole D1 of the disk D, and the disk D can be pressed and fixed onto the turntable 31.

First, the disc fixing member 32A shown in FIG. 6A has a ring shape that is loosely fitted to the cylindrical portion 310 of the turntable 31 of the rotor assembly 5 shown in FIG. In this disc fixing member 32A, the claws protruding from the metal main body portion 321A in three directions are folded back upward and then folded back inward, so that the disc centering member 32 shown in FIG. Three disc pressing portions 323A that come into contact with the upper peripheral edge D12 of the central hole D1 of the disc D
And a leaf spring portion 324A (elastically deformable portion) that biases these three disc pressing portions 323A independently of each other.

A disk fixing member 32B shown in FIG. 6 (B).
Has a ring-shaped frame 321B that is loosely fitted to the cylindrical portion 310 of the turntable 31 of the rotor assembly 5 shown in FIG. Also, the frame 32
From the outer peripheral portion of 1B, a disc pressing piece 323B made of a steel ball and a rubber O-ring 324 for biasing these disc pressing pieces 323B to the outside independently of each other.
B (elastically deformable portion).

A disc fixing member 32C shown in FIG. 6C.
2 is a resin molded body having a ring shape that is loosely fitted to the cylindrical portion 310 of the turntable 31 in the rotor assembly 5 shown in FIG. Further, the disc fixing member 32C has a frame portion 321 that is fan-shaped and projects outwardly.
The frame portion 321C has an arcuate side surface portion 324C and a hemispherical disk pressing portion 323C. Here, since the arcuate side surface portion 324C is also made of resin, the arcuate side surface portion 324C is elastically deformed so that the disk pressing portion 323C is retracted inward, and the disk aligning member 32 shown in FIG. It functions as an elastically deforming portion that elastically abuts the disc pressing portion 323C on the upper peripheral edge D12 of the center hole D1 of the centered disc D1.

Further, the disc aligning member 34 may have a ring shape having an aligning portion consisting of a tapered portion with which the lower peripheral edge D11 of the center hole D1 of the disc D abuts over the entire circumference. In this case, there is an advantage that the processing time of the disk aligning member 34 can be shortened and the manufacturing cost can be reduced.

[0041]

As described above, in the disk rotation drive device of the present invention, when the disk is lowered onto the turntable, the disk centering member urged in the direction away from the turntable is The center of the disc is adjusted by contacting the lower edge of the center hole of the disc and sinking to the turntable side. On the other hand, the disk pressing portion elastically presses the upper peripheral edge of the center hole of the disk toward the turntable when the mounting of the disk on the turntable is completed. Therefore, the centering of the disc is surely performed by the disc aligning member, and the disc is securely fixed on the turntable by the disc fixing member. Further, even if the upper peripheral edge and the lower peripheral edge are displaced from each other in the center hole of the disk, the disk aligning member reliably performs centering of the disk with the lower peripheral edge of the center hole of the disk as a reference. Therefore, in a digital video disc or the like composed of bonded substrates, even if the position of the central hole is deviated between the bonded two substrates, the disc aligning member has the pit information formed. The center of the disk is centered on the lower edge of the central hole of the substrate. Therefore, in the chucking mechanism of the disk rotation drive device to which the present invention is applied,
It is possible to reliably reproduce or record information from a digital video disc. Further, in the present invention, the disc pressing portion is retracted to the position where it does not hinder the placement of the disc until the disc is placed on the turntable by the engagement with the disc aligning member. When the disc is placed on the disc, the disc pressing portion does not touch the central hole of the disc at all or only touches it lightly. Therefore, even if the disc is repeatedly placed on the turntable, the disc will not be distorted.

[Brief description of drawings]

FIG. 1 is a plan view of a disk rotation drive device to which the present invention is applied.

2 is a schematic cross-sectional view taken along the line II-II ′ of FIG. 1, where (A) is a cross-sectional view showing a state before the disc is placed on the turntable, and (B) is the disc placed on the turntable. It is sectional drawing which shows the state which finished mounting.

FIG. 3 is a perspective view of a disk fixing member used in the disk rotation driving device shown in FIGS. 1 and 2.

4 (A) and 4 (B) are enlarged explanatory views showing a contact portion between the taper portion of the disc centering member and the disc in the disc rotation driving device shown in FIGS. 1 and 2.

5A is a cross-sectional view of the vicinity of the central hole of the digital video disc, and FIG. 5B is a view showing that the digital video disc has been placed on the turntable of the disc rotation driving device shown in FIGS. 1 and 2. It is sectional drawing which shows the state which was opened.

6 (A), (B), and (C) are perspective views of various disk fixing members usable in the disk rotation driving device shown in FIGS. 1 and 2, respectively.

FIG. 7A is a cross-sectional view showing a state before a disc is placed on the turntable of the conventional disc rotation drive device, and FIG. 7B is a cross-sectional view of the disc on the turntable of the conventional disc rotation drive device. FIG. 4 is a cross-sectional view showing a state after the placement is completed.

[Explanation of symbols]

1 Disk rotation drive 2 Motor body 3 chucking mechanism 31 turntable 32 Disc fixing member 323 Disc pressing piece (disc pressing part) 324 Coil spring (elastic deformation part) 328 Step for engagement 33 lid material 34 Disc aligning member 340 alignment part 341 taper part 342 Upper end of alignment part 345 coil spring 4 Stator assembly 5 rotor assembly 52 Motor rotating shaft D disk Central hole of D1 disc Lower edge of D11 disc center hole The upper edge of the center hole of the D12 disc Lower board of DA digital video disc DB Digital video disc upper substrate DA1 Digital Video Disc Bottom Hole Center Hole DB1 Digital video disc center hole on the upper substrate DA11 Lower edge of central hole of lower substrate DB12 Upper peripheral edge of the central hole of the upper substrate

Continuation of front page (56) Reference JP-A-5-258435 (JP, A) JP-A-1-144262 (JP, A) JP-A-2-223055 (JP, A) JP-A-5-274761 (JP , A) JP-A-11-120652 (JP, A) JP-A-10-188418 (JP, A) Actually developed 59-194191 (JP, U) Registered utility model 3028842 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) G11B 17/022-17/035

Claims (5)

(57) [Claims] 1. A rotor assembly including a turntable on which a disk having a central hole is placed, and a rotor assembly that is movably held in the axial direction on the rotor assembly and is separated from the turntable. A disc centering member that is urged and sinks toward the turntable side to center the disc when the disc is placed on the turntable and the lower peripheral edge of the center hole abuts; The turntable includes a disc pressing portion that is retracted to a position that does not hinder the placement of the disc on the turntable by engagement with the disc alignment member until the disc is placed on the table. The disk centering member and the disk due to the sinking of the disk centering member when the disk is placed on the disk. Disc fixing configured on the rotor assembly such that the disc pressing portion is released at the position where the disc pressing portion elastically presses the upper peripheral edge of the center hole toward the turntable by releasing the engagement with the fastening portion. A disk fixing member , the disk fixing member being a cylinder of the rotor assembly.
Have a ring shape that is loosely fitted to the cylindrical part or the cylindrical part
In the radial direction on the rotor assembly
The disk rotation drive device is characterized in that it can be displaced in any direction . 2. The disk fixing part according to claim 1.
The material is provided with the disk pressing portion at a plurality of positions.
Also, the disk pressing parts at the multiple locations are independent of each other.
And elastically press it against the upper edge of the center hole.
Disk drive device characterized by including a flexible deformation portion
Place 3. The disk according to claim 1 or 2.
The centering member is a taper with which the lower peripheral edge of the center hole abuts.
Has a ring shape with multiple centering parts
A disk rotation drive device characterized by being. 4. The disk according to claim 1 or 2.
The centering member is a taper with which the lower peripheral edge of the center hole abuts.
Ring shape with centering part consisting of parts over the entire circumference
A disk rotation drive device comprising: 5. The aligning portion according to claim 3 or 4.
Is the upper end portion from the position where the lower peripheral edge of the central hole abuts
Up to 1/2 of the thickness of the disc
A disk rotation drive device characterized by the above.