JP3690027B2 - Disk drive device and disk holding mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk drive device and a disk holding mechanism for rotationally driving an information recording disk composed of a plurality of disk substrates.
[0002]
[Prior art]
Examples of information recording disks include a compact disk (CD), a read-only memory (CD-ROM) using a compact disk, a magneto-optical disk (MO), and a mini disk (MD). An optical pickup is used to write information on such an information recording disk or to reproduce previously recorded information. If the positional relationship between the disc, the turntable, and the optical pickup is not maintained with high accuracy, reading of information recorded on the disc and writing of information to the disc cannot be performed with high accuracy. Problems such as inability to play music and video occur.
[0003]
A normal information recording disk is made of synthetic resin, and has a hole in the center thereof. The disk drive device rotates with such a disk hole mounted on the turntable. However, the diameter of the disk hole has a relatively large variation in manufacturing, so that the positional deviation of the disk with respect to the turntable is suppressed. Therefore, it is necessary to take measures against variations in the hole diameter.
For this reason, when a normal disk is mounted on a turntable of a drive device, a disk centering mechanism is required on the turntable side.
[0004]
A conventional disk drive device is configured as shown in FIGS. 6 and 7, for example.
6 and 7, the disk drive device 1 for CD playback includes a spindle motor 2, a turntable 3, and a clamper 4.
The spindle motor 2 is composed of a rotor 2a and a stator board 2b. The stator board 2b is mounted on the chassis 2c and fixed by screws 2d.
The chassis 2c is mounted on a main body frame (not shown) of the disk drive device 1 via a rubber insulator 2e so that vibration is not transmitted to the optical disk.
[0005]
The turntable 3 is fixed concentrically with respect to the upper end portion of the rotating shaft 2f of the spindle motor 2, and the CD 5 is detachably mounted on the turntable 3.
In the center of the turntable 3, a circular disc mounting reference convex portion 3a is formed in the horizontal direction, and the optical disc 5 is inserted into the circular hole 5a formed in the center thereof. Thus, it is designed to be mounted on the turntable 3.
[0006]
The clamper 4 is formed in a circular shape, and has a circular concave portion at the center of the lower surface thereof. The convex portion 3a of the turntable 3 is accommodated in the concave portion.
A magnet 4 a is attached to the back of the concave portion of the clamper 4, and the magnet 4 a is attracted to the upper surface of the convex portion 3 a of the turntable 3, so that the lower surface of the peripheral portion of the clamper 4 is a corresponding portion of the optical disk 5. Press. Thus, the CD 5 is sandwiched between the turntable 3 and the clamper 4 and fixed on the turntable 3.
[0007]
As shown in FIG. 7, an optical pickup 6 for reading / writing information from / to an optical disk 5 is slidably attached in the radial direction of the CD 5 along a guide shaft 7a attached to the chassis 2c. It is driven by a thread motor 7b through a thread gear 7c and the like.
[0008]
A centering mechanism for the CD 5 is provided on the convex portion 3a of the turntable 3 in FIG. 6, and the convex portion 3a of the turntable 3 has a base portion 8a as shown in FIGS. , A ring 8b, a coil spring 8c, and a chucking yoke 8d.
[0009]
The base portion 8a is formed at the center of the turntable 3 so as to surround a bearing portion that is press-fitted into the rotary shaft 2f of the spindle motor 2 of FIG. A coil spring 8c is provided for the base 8a, and a ring 8b is fitted from above. An annular chucking yoke 8d to be attracted by the magnet 4a of the clamper 4 of FIG. 6 is provided at the upper end of the base 8a. (In the case of illustration, the chucking yoke 8d is formed integrally with the base 8a.)
[0010]
When the CD 5 is mounted on the turntable 3 having the centering mechanism having such a configuration, the lower edge of the hole 5a of the CD 5 comes into contact with the vicinity of the middle in the vertical direction of the outer peripheral surface of the ring 8b. Then, the ring 8b descends against the tension of the coil spring 8c by its own weight.
Thereafter, when the clamper 4 is fitted into the convex portion 3a, the magnet 4a is attracted to the chucking yoke 8d. As a result, the CD 5 is pressed by the chucking yoke 8d and further lowered together with the ring 8b. Accordingly, the lower surface of the CD 5 comes into contact with the upper surface of the turntable 3 and is fixed on the turntable 3.
[0011]
When the CD 5 is mounted on the turntable 3, the hole diameter of the hole 5 a of the optical disk 5 has some variation due to the ring 8 b having an outer peripheral surface having a truncated cone shape and slidable up and down by being biased by the coil spring 8 c. Even so, the variation is absorbed by the vertical movement of the ring 8b, and it is possible to reliably prevent the optical disk 5 from being mounted on the turntable 3 in an eccentric state.
[0012]
However, in the turntable 3 having this centering mechanism, a gap is required between the ring 8b and the base 8a so that the ring 8b can slide in the vertical direction with respect to the base 8a. A center shift occurs between the CD 5 and the turntable 3, which is a factor in deterioration of read / write accuracy and characteristics of the optical pickup 6.
[0013]
In addition, since the space for the vertical movement of the ring 8b is required, the entire turntable 3 becomes relatively high, which is disadvantageous for downsizing and thinning of the entire optical disc apparatus.
Further, since the CD 5 mounted on the turntable 3 is always pressed upward by the coil spring 8c via the ring 8b, the chucking force by the magnet 4a is weakened. Therefore, in order to prevent the slip between the CD 5 and the turntable 3, it is necessary to use a stronger magnet 4a.
[0014]
On the other hand, as a high-density recording optical disk, for example, a bonded disk has been developed as shown in FIG.
The bonded disk 9 shown in FIG. 10 is configured by stacking two disk substrates 9a and 9b and bonding them with an adhesive. Each of the optical disk substrates 9a and 9b is provided with holes 9a1 and 9b1 having a diameter of 15 mm, for example, in the center.
[0015]
Each disk substrate 9a, 9b has a maximum permissible dimension of the inner diameter of the holes 9a1, 9b1 of 0.15 mm on the plus side and 0 mm on the minus side of a single disk substrate. Yes. The case where the bonded disc 9 has the maximum deviation allowed by the standard means that the inner diameters of the holes 9a1 and 9b1 of the disc substrates 9a and 9b are 15.15 mm as shown in FIGS. In this state, they are bonded together in a state of being shifted by 0.15 mm in opposite directions.
Therefore, the actually produced bonded type disk 9 is generally in a state where the holes 9a1 and 9b1 of the upper and lower disk substrates 9a and 9b are slightly displaced as shown in FIG. 12, for example. For this reason, when the above-described centering mechanism is used, since the holes 9a1 and 9b1 of the optical disk substrates 9a and 9b to be the centering reference are shifted from each other, accurate centering of the disk cannot be performed.
[0016]
Therefore, a disk holding mechanism as shown in FIG. 13 has been proposed. The holding mechanism shown in FIG. 13 has a structure having a fixed portion 17 and a movable portion 18 for holding the disk 9. The movable portion 18 includes a tapered portion 18a. The tapered portion 18a receives the edge 9c on the inner diameter side of the holes 9a1 and 9b1 of the disk substrates 9a and 9b of the disk 9.
[0017]
[Problems to be solved by the invention]
However, with such a structure, the centering accuracy of the disk 9 greatly depends on whether or not the inner diameter edge 9c of the disk 9 is chamfered and the degree of chamfering. This is more remarkable as the range (stroke) in which the movable portion 18 can move in the direction of the arrow R is smaller.
[0018]
Moreover, when the structure of the movable part 18 as shown in FIG. 14 or FIG. 15 is adopted, there are the following problems.
The movable portion 18 in FIG. 14 is configured to receive a disc inner diameter portion by setting a part of the tapered portion 18a in FIG. 13 to fit only the inner diameter portion of the hole of the lower disk substrate 9b. . However, since the inner diameter edge 9c of the upper disk substrate 9b also contacts the outer peripheral surface of the movable portion 18, the disk 9 cannot be accurately centered.
[0019]
The movable portion 18 in FIG. 15 is obtained by changing the taper angle of the tapered portion 18d as compared with FIG. 13 in order to reduce the region in contact with the inner diameter portion of the lower disk substrate 9b. However, since the length h of the portion 18e of the movable portion 18 that contacts the lower disk substrate 9b, that is, the portion that contributes to the centering of the disk 9, becomes very short, the centering performance of the disk 9 deteriorates. .
The present invention solves the above-described problems, and can reliably ensure the centering performance of the disk without being affected by the presence or absence of chamfering on the inner diameter edge side of the information recording disk bonded with a plurality of disk substrates. An object of the present invention is to provide a disc drive device and a disc holding mechanism that can be used.
[0020]
[Means for Solving the Problems]
In the present invention, the object is to hold a motor and a turntable mounted on the output shaft of the motor, and to hold an information recording disk on which the plurality of disk substrates are bonded together on the turntable. In the disk drive device including the disk holding mechanism for rotating the disk, the disk holding mechanism includes only a fixing portion for contacting and holding only the disk substrate positioned on the turntable side, and the disk substrate positioned on the turntable side. A movable portion that elastically deforms in the radial direction in contact with the holding portion, the movable portion is in contact with the inner diameter portion of the disk substrate located on the turntable side, and holds the disk substrate located on the turntable side, and The guide curved surface portion closest to the holding portion, the fulcrum position curved surface portion at the elastic deformation fulcrum position for elastically deforming the movable portion, the guide curved surface portion and the fulcrum position curve This is achieved by a disk drive device that is disposed on the inner side of the position of a straight line that contacts the section and has a curved surface portion for preventing contact to prevent contact with a disk substrate other than the disk substrate positioned on the turntable side. .
[0021]
In the present invention, the fixed portion of the disk holding mechanism contacts and holds only the disk substrate located on the turntable side. The movable part of the disk holding mechanism comes into contact with only the disk substrate located on the turntable side and elastically deforms in the radial direction.
In this case, the holding part of the movable part holds the disk substrate located on the turntable side in contact with the inner diameter part of the disk substrate located on the turntable side. The guide curved surface portion of the movable portion is at a position closest to the holding portion. The fulcrum position curved surface portion of the movable part is located at the elastic deformation fulcrum position for the movable part to elastically deform.
[0022]
The contact-preventing curved surface portion is disposed on the inner side of the position of the straight line contacting the guide curved surface portion and the fulcrum position curved surface portion. Accordingly, the curved surface portion for preventing contact can prevent a disk substrate other than the disk substrate located on the turntable side from hitting the movable portion.
Accordingly, the inner diameter portion of the disk substrate positioned on the turntable side is firmly centered by the holding portion of the movable portion, and disk substrates other than the disk substrate positioned on the turntable side are avoided by the curved surface portion for preventing contact. This disc substrate does not interfere with the centering of the disc on the turntable.
[0023]
According to the present invention, there is provided a disc holding mechanism for holding and rotating an information recording disc on which a plurality of disc substrates are bonded together on a turntable. A fixed portion for contacting and holding only the disk substrate located on the turntable, and a movable portion that contacts only the disk substrate located on the turntable side and elastically deforms in the radial direction. A holding portion for holding the disc substrate located on the turntable side in contact with the inner diameter portion of the disc substrate located on the side, a guide curved surface portion closest to the holding portion, and an elastic deformation fulcrum position for elastically deforming the movable portion Other than the fulcrum position curved surface portion and the disc substrate located on the turntable side, located inside the position of the straight line contacting the guide curved surface portion and the fulcrum position curved surface portion Abutment preventing the curved portion to prevent the hitting the disk substrate, the disk holding mechanism having, is achieved.
[0024]
In the present invention, the fixed portion of the disk holding mechanism of the disk drive device holds and contacts only the disk substrate located on the turntable side. The movable part of the disk holding mechanism comes into contact with only the disk substrate located on the turntable side and elastically deforms in the radial direction.
In this case, the holding part of the movable part holds the disk substrate located on the turntable side in contact with the inner diameter part of the disk substrate located on the turntable side. The guide curved surface portion of the movable portion is at a position closest to the holding portion. The fulcrum position curved surface portion of the movable part is located at the elastic deformation fulcrum position for the movable part to elastically deform.
[0025]
The contact-preventing curved surface portion is disposed on the inner side of the position of the straight line contacting the guide curved surface portion and the fulcrum position curved surface portion. Accordingly, the curved surface portion for preventing contact can prevent a disk substrate other than the disk substrate positioned on the turntable from hitting the movable portion.
Accordingly, the inner diameter portion of the disk substrate positioned on the turntable side is firmly centered by the holding portion of the movable portion, and disk substrates other than the disk substrate positioned on the turntable side are avoided by the curved surface portion for preventing contact. This disc substrate does not interfere with the centering of the disc on the turntable.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
The embodiment described below is a preferred specific example of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these forms.
[0027]
FIG. 1 shows a preferred embodiment of the disk drive apparatus of the present invention.
The disk drive device 20 shown in FIG. 1 is provided in an optical disk device, and is a device that, for example, removably centers and positions a high-density recording disk 9 and rotates continuously.
The disk 9 used here is configured by bonding an upper (upper layer) disk substrate 9a and a lower (lower layer) disk substrate 9b with an adhesive in order to increase information recording density and recording amount. is there. When the disk 9 is manufactured, an adhesive is interposed between the disk substrates 9a and 9b and the disk 9 is bonded. However, in the manufacturing process, there may be a shift in bonding the two. The standard size of the inner diameter of the disk 9 is (15 mm + 0.15 mm) in the case of a single plate unlike the one in FIG. 1, but two single-plate disk substrates 9 a and 9 b are pasted like the disk 9. After mating, the inner diameter is a minimum of 15 mm.
Even if the disc substrates 9a and 9b are displaced and stuck together, that is, the so-called limit disc state, within the range permitted by the standard of the high-density recording disc 9, only the lower disc substrate 9b is used. Thus, it is necessary to complete the centering of the disk 9 so that the upper disk substrate 9 a does not come into contact with any part of the disk holding mechanism 30.
[0028]
The disk drive device 20 in FIG. 1 includes a motor 21, a turntable 22, a clamper 23, and the like.
The motor (spindle motor) 21 includes a rotor and a stator, and the motor 21 is attached to a main body frame 20a of the optical disc apparatus via a rubber insulator 21a. The insulator 21a prevents vibration from being transmitted from the main body frame 20a to the disk 9.
[0029]
The rotor 21b of the motor 21 rotates with respect to the stator 21c. The rotor 21b rotates integrally with the shaft 21d and includes, for example, a rotor magnet. On the other hand, the stator 21c includes a coil, an iron core for the coil, and the like. By energizing the coil of the stator 21c from the outside with a predetermined energization pattern, the rotor 21b is continuously connected to the stator 21c by the interaction between the magnetic flux of the rotor magnet of the rotor 21b and the magnetic flux generated from the coil of the stator 21c. It is designed to rotate. The turntable 22 is fixed to the shaft 21d of the motor 21 by press-fitting or bonding. A disc receiving portion 22b is formed on the periphery of the turntable 22 so as to protrude upward in a ring shape. The receiving portion 22b receives the lower surface of the disk substrate 9b below the disk 9 when the disk 9 is chucked.
[0030]
In relation to the turntable 22 and the shaft 21d, the chucking yoke 24 and the chucking member 25 of the disk holding mechanism 30 are fixed. The chucking yoke 24 is fixed to the end of the shaft 21d by press-fitting or bonding, so that the chucking member 25 is fixed between the chucking yoke 24 and the inner surface 22a of the turntable 22. .
The chucking member 25 is made of an elastically deformable material such as polyacetal or polycarbonate.
[0031]
The chucking member 25, the chucking yoke 24, and the turntable 22 are disposed concentrically around the central axis CL of the shaft 21d. The disc 9 is detachably fitted to the chucking member 25, and the clamp portion 23 is fitted from above so that the receiving portion 22b receives the lower surface of the lower disc substrate 9b. The table 22 can be held. At this time, since the clamper 23 has a chucking magnet 23 a, the clamper 23 is magnetically attracted to the upper surface of the chucking member 25 of the turntable 22, so that the clamper 23 corresponds to the disk 9. Press the part you want. As a result, the disk 9 is firmly fixed to the turntable 22 so as to be sandwiched between the turntable 22 and the clamper 23.
[0032]
FIG. 2 is a plan view of an optical disk device including the disk drive device 20 of FIG. The optical disk device 100 includes the disk drive device 20, the optical pickup OP, the chassis 38, and the like shown in FIG. The optical pickup OP is moved and positioned along the direction S of the guide shaft 39 by applying a driving force to the optical pickup OP through the gears 37c, 37d, and 37e by the operation of the motor 37b.
The optical pickup OP has an objective lens 36 for irradiating the information recording surface of the disk 9 with, for example, a focused spot of laser light and guiding the return light to the light receiving element side. The optical pickup OP has a function of reproducing information on the disk 9 detachably mounted on the disk drive device 20 as described above or recording information on the disk 9.
Alternatively, the optical disc apparatus 100 has only a function of reproducing information on the disc 9 by the optical pickup OP.
[0033]
3 and 4 show an example of the structure of the chucking member 25 of the disc holding mechanism 30 shown in FIG.
The chucking member 25 is a substantially circular member as shown in FIG. 4, and a plurality of fixed portions 47 and a plurality of movable portions 48 are formed on the outer peripheral surface thereof so as to protrude in the radial direction. . The fixed portion 47 is formed so as to protrude in the opposite direction to the movable portion 48 opposite in the diameter direction, and the fixed portion 47 and the movable portion 48 are arranged side by side at adjacent positions.
3 is a cross-sectional view taken along line AA in FIG. In FIG. 3, as an example, between the upper disk substrate 9 a and the lower disk substrate 9 b of the disk 9, the manufacturing variation in the hole diameters of the upper and lower disks, and bonding when bonding with an adhesive A shift amount P is generated. The outer diameter of the disk 9 is 12 cm, for example.
[0034]
In order to reliably center the disc 9 that has been displaced during such bonding, a fixed portion 47 and a movable portion 48 as shown in FIGS. 3 and 4 are provided. At least three fixed portions 47 and seven movable portions 48 are provided for each same angle, and seven each in the example of FIG.
As shown in FIG. 3, the fixing portion 47 has an outer peripheral fixing surface 51. The radius E from the center CL of the chucking member 25 of the outer peripheral fixing surface 51 substantially corresponds to the inner diameter surface 9g of the disk substrate 9b on the lower side of the disk 9 shown in FIG. 3 from the center CL of the turntable 22 shown in FIG. are doing. This radius E is, for example, 15 mm. The upper part of the outer peripheral fixed surface 51 is an inclined surface 52, and this inclined surface 52 is an inclined surface that becomes narrower as it goes upward.
The height F of the fixed portion 47 in the direction of the central axis CL is set to be considerably larger than the thickness of the lower disk substrate 9b.
[0035]
Next, the structure of the movable part 48 in FIGS. 3 and 4 will be described.
The movable part 48 is formed so as to protrude downward from the chucking member 25 in the shape of a tongue. As shown in FIGS. 3 and 5, the thickness of the movable portion 48 is almost the same in any portion. The movable portion 48 includes a holding portion 60, a guide curved surface portion 61, a fulcrum position curved surface portion 62, a contact preventing curved surface portion 63, and the like.
As shown in FIG. 3, the holding portion 60 of the movable portion 48 is in contact with the inner diameter portion 9g of the lower disk substrate 9b located on the turntable 22 side, and positions and holds the disk substrate 9b (centering). It is a part to do.
The height G of the holding portion 60 shown in FIG. 5 is set to be equal to or greater than the thickness of the lower disk substrate 9b with respect to the central axis CL.
[0036]
The guide curved surface portion 61 is formed at a position closest to the upper portion of the holding portion 60. The guide curved surface portion 61 is a portion that smoothly guides the inner diameter surface 9g when the lower disk substrate 9b is pushed down in the direction of the arrow Z toward the holding portion 60 side.
The fulcrum position curved surface portion 62 is a portion joined to the main body portion 25a of the chucking member 25, and corresponds to a fulcrum position when the movable portion 48 is elastically deformed in the R direction as a whole.
[0037]
Particularly noteworthy in FIGS. 5 and 3 is the curved surface portion 63 for preventing contact. This contact-preventing curved surface portion 63 is positioned on the inner side, that is, on the center axis CL side, from the range connecting the outermost portion of the guide curved surface portion 61 and the outermost portion of the fulcrum position curved surface portion 62 with a straight line LN. . In this way, by forming the contact-preventing curved surface portion 63 in a concave shape, the inner diameter edge 9j of the upper disk substrate 9a is movable while the lower disk substrate 9b is held by the holding portion 60. 48 can be prevented from hitting the outer peripheral surface.
As a result, the inner diameter side edge 9j of the upper disk substrate 9a does not hit the movable portion 48, and the inner diameter surface 9g of the lower disk substrate 9b can be securely held by the holding portion 60 while being centered.
[0038]
Further, since the fulcrum position curved surface portion 62 has a curved surface shape, the disk 9 can be smoothly fitted when the disk 9 is fitted into the chucking member 25, and the guide curved surface portion 61 also has a curved surface shape. Therefore, the lower disk substrate 9b can be smoothly inserted into and held in the holding unit 60.
On the other hand, if the guide curved surface portion 61 has a protruding shape that is not a curved surface portion, that is, a stepped shape, the lower disk substrate 9b is caught during chucking and it is difficult to mount the disk 9 smoothly.
[0039]
Note that the radius E of the outer peripheral fixed surface 51 from the central axis CL in FIG. 3 is set to 15-0.01 mm to 15-0.03 mm, for example, so that the disk 9 having a minimum inner diameter of 15 mm can be inserted. ing. Even when the upper disk substrate 9a and the lower disk substrate 9b are loaded with a so-called marginally usable disk 9 on which the upper disk substrate 9a and the lower disk substrate 9b have shifted to the displacement amount P, the movable portion 48 has an inner diameter edge. 9j avoids the curved surface portion 63 for preventing contact, so that it does not contact the chucking member 25, and the disk 9 can be accurately centered about the central axis CL.
By doing so, the centering performance of the disk 9 can be stably secured without being affected by the presence or absence of the chamfering of the inner diameter side edge of the disk 9 and the size of the chamfering degree.
[0040]
【The invention's effect】
As described above, according to the present invention, the centering performance of the disc is reliably ensured without being affected by the presence or absence of the chamfering on the inner diameter edge side of the information recording disc in which a plurality of disc substrates are bonded together. can do.
[Brief description of the drawings]
FIG. 1 is a side view with a partial cross section showing a disk drive device and a disk holding mechanism of the present invention.
FIG. 2 is a plan view showing an example of an optical disc apparatus including the disc drive apparatus of FIG.
FIG. 3 is an enlarged view showing a disk holding mechanism of the disk drive device of FIG. 1;
4 is a plan view showing a chucking member of the disk holding mechanism of FIG. 3;
5 is an enlarged view showing the vicinity of a movable part of the chucking member of FIG. 3;
FIG. 6 is a side view showing an example of a conventional disk drive device.
FIG. 7 is a plan view of an optical disk device including a conventional disk drive device.
FIG. 8 is a view showing a conventional chucking device.
9 is an enlarged view of the chucking device of FIG. 8;
FIG. 10 is a cross-sectional view showing a disk made by bonding together a plurality of disk substrates.
FIG. 11 is a diagram showing a state in which a plurality of disk substrates are bonded together with displacement.
FIG. 12 is a diagram showing a state in which a plurality of disk substrates are bonded together with displacement.
FIG. 13 is a diagram showing an example of a conventional disc holding mechanism.
FIG. 14 is a diagram showing an example of a conventional disk holding mechanism.
FIG. 15 is a diagram showing an example of a conventional disc holding mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 9 ... Disk, 9a ... Disk board | substrate, 9b ... Disk board | substrate (disk board | substrate near the turntable 22), 20 ... Disk drive device, 21 ... Motor, 22 ... Turn Table, 23 ... Clamper, 25 ... Chucking member, 30 ... Disc holding mechanism, 47 ... Fixed part, 48 ... Movable part, 60 ... Holding part, 61 ... Guide Curved surface portion, 62... Fulcrum position curved surface portion, 63... Contact prevention curved surface portion, LN... Straight line connecting guide curved surface portion 61 and fulcrum position curved surface portion

Claims (4)

A disk having a motor and a disk holding mechanism for holding and rotating an information recording disk having a plurality of disk substrates bonded together on the turntable, the turntable mounted on the output shaft of the motor In the drive device,
The disk holding mechanism
A fixed part for contacting and holding only the disk substrate located on the turntable side;
A movable part that elastically deforms in the radial direction by contacting only the disk substrate located on the turntable side;
With
The moving part is
A holding portion for holding the disk substrate located on the turntable side in contact with the inner diameter portion of the disk substrate located on the turntable side;
A guide curved surface portion closest to the holding portion;
A fulcrum position curved surface part at an elastic deformation fulcrum position for the movable part to elastically deform;
A curved surface portion for preventing contact, which is arranged on the inner side of the position of the straight line contacting the guide curved surface portion and the fulcrum position curved surface portion, and prevents contact with a disk substrate other than the disk substrate positioned on the turntable side;
A disk drive device comprising: 2. The disk drive device according to claim 1, wherein the information recording disk is formed by bonding two disk substrates together using an adhesive. In a disk holding mechanism for holding and rotating a disk for information recording bonded with a plurality of disk substrates on a turntable,
The disk holding mechanism
A fixed part for contacting and holding only the disk substrate located on the turntable side;
A movable part that elastically deforms in the radial direction by contacting only the disk substrate located on the turntable side;
With
The moving part is
A holding portion for holding the disk substrate located on the turntable side in contact with the inner diameter portion of the disk substrate located on the turntable side;
A guide curved surface portion closest to the holding portion;
A fulcrum position curved surface part of an elastic deformation fulcrum position for the movable part to elastically deform;
A curved surface portion for preventing contact, which is arranged on the inner side of the position of the straight line contacting the guide curved surface portion and the fulcrum position curved surface portion, and prevents contact with another disk substrate located on the turntable side;
A disk holding mechanism characterized by comprising: 4. The disk holding mechanism according to claim 3, wherein the information recording disk is formed by bonding two disk substrates together using an adhesive.

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