JP2000298902A - Turntable device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a turntable device which has a centering function to prevent the offcentering of a disk and has excellent dimensional accuracy with inexpensive means. SOLUTION: The turntable device for positioning the disk D having a central hole by exactly causing the self-aligning of the disk when rotatably supporting the disk within a drive comprises a turntable part 11 which supports the peripheral surface of the central hole of the disk D, a center ring part 12 which is fitted into the central hole of the disk D and a self-aligning part 15 which causes the self-aligning of the center of the disk D and the center of the center ring part 12. At least one of the turntable part 11, the center ring part 12 and the self-aligning part 15 is molded of a non-crystalline thermoplastic resin material having a glass transition temperature (Tg) of >=170 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable device, and more particularly to a turntable component for driving an information storage disk in a disk-type information storage / reproduction device, for example, an audio or digital video disk, The present invention relates to a turntable device that can be suitably used as a turntable for an information storage disk such as a CD-ROM.

[0002]

2. Description of the Related Art Conventionally, audio CDs and CD-ROMs
The turntable device for etc. is mainly composed of a turntable part supporting a peripheral surface of a center hole formed in the center of the information storage disk and a center ring part fitting into the center hole of the information storage disk. . The diameter of the center hole in the information storage disk is determined by a unified standard, but the tolerance of the hole diameter in the standard is relatively large.

[0003] Therefore, when the information storage disk is inserted into the drive and set on the turntable, even if the center ring portion is fitted into the center hole of the information storage disk, the center of the information storage disk and the center ring portion are not removed. A case occurs where the centers do not exactly match.

When the information storage disk is rotated in this state, that is, in the eccentric state, an eccentric rotation called "whirl" occurs. Although there was no problem in reading and writing information at a low speed as in the past, when the rotation speed was increased to increase the reading speed and writing speed of the information, the information was read due to the eccentric rotation of the information storage disk. And the probability of an error occurring in writing becomes extremely high.

Therefore, in order to read and write information by rotating this type of information storage disk at high speed, it is necessary to greatly increase the "centering accuracy" of the information storage disk set on the turntable. Therefore, in the conventional information storage disk drive, a turntable provided with a centering unit has been used.

A conventional disk drive of this type will be described with reference to FIGS. In the conventional disk drive shown in these figures, the rotor yoke 1 is rotated by a spindle motor (not shown), and with the rotation,
The turntable 3 on which the rotating shaft 2 is mounted by press fitting or the like rotates.

The turntable 3 is made of brass, and is made of a saw-milled material or a synthetic resin material. The turntable 3 is provided with a cylindrical portion 3a around a central portion thereof. The rotary shaft 2 is press-fitted at the center of the portion 3a. A disk-shaped turntable portion 3b is formed on the outer peripheral side of the cylindrical portion 3a.
The surface is flat, and an anti-slip sheet 4, which is a disk mounting surface, is adhered to the flat turntable portion 3b with an adhesive tape.

The bottom surface of the turntable 3 is fixed to the rotor yoke 1. A circular concave portion 3c is formed on the upper surface of the cylindrical portion 3a of the turntable 3, and a ring-shaped attracting magnet 5 is fixed in the concave portion 3c with an adhesive or the like. A centering spring 6 for centering the disk D is held in the recess 3c together with the attraction magnet 5.

As shown in FIGS. 5 and 7, the centering spring 6 has a circular outer shape and is made of a metal or synthetic resin material, and its center portion has a holding portion 6 bent downward.
a. A plurality of centering portions for centering the disk D are formed on the tip side of the fulcrum 6b of the centering spring 6 near the periphery of the tato. That is, the centering portion includes a first tapered portion 6c and a second tapered portion 6d which is continuous with the tapered portion 6c and whose inclination angle is larger than that of the first tapered portion. Is formed in a petal shape by the tongue piece.

The first and second tapered portions 6c, 6c
Since d is a cantilever beam centered on the fulcrum 6b, the second tapered portion 6d on which the disk D is centered is elastically moved outward in an obliquely upward direction, that is, in the direction of arrow A shown in FIG. Being energized. A clamper 7 for mounting the disc D on the turntable portion 3b of the turntable 3 and chucking the disc D is disposed above the turntable 3 and the center ring spring 6, as shown in FIG. .

Next, the operation of the conventional disk drive will be described.
Is loaded, as shown in FIG. 6, the peripheral edge of the center hole of the disk D contacts the first and second tapered portions 6c and 16d of the center ring spring 6 having spring properties, and Slide down along. Then, the disk D is centered by the first and second taper portions 6c and 6d,
The turntable 3 is placed on the slip prevention sheet 4.

Then, at the same time when the disk D is centered, the clamper 7 waiting above the turntable 3 descends. The clamper 7 presses the surface of the disk D by the attraction force of the attracting magnet 5, and the disk D is held between the turntable 3 and the clamper 7, and the centering and chucking of the disk D are completed.

Thereafter, when power is supplied to a drive coil of a spindle motor (not shown) at a predetermined phase, the turntable 3 and the rotary shaft 2 rotate integrally with the rotation of the rotor yoke 1. As a result, the disk D can be rotated while being held between the clamper 7 and the turntable 3, so that information can be read or written.

On the other hand, as the synthetic resin material used for the above-described turntable, polycarbonate or a material obtained by reinforcing polycarbonate with glass fibers has been mainly used. These materials are easier to achieve dimensional accuracy than other synthetic resin materials, and are generally used for molded parts that require high dimensional accuracy. The turntable requires high precision on the order of microns in the runout dimension of the turntable part and the centering dimension of the alignment part. This is because the probability that an error occurs in writing or writing becomes extremely high.

[0015]

However, the conventional disk drive as described above has the following problems. That is, the conventional disk drive device
The turntable part and the centering part are formed separately from each other,
It is constructed by assembling them. Therefore, a relatively large dimensional error is likely to occur in the entire turntable due to an error in the processing accuracy of these components and an error in the assembly accuracy, and this error causes the centering position when the information storage disk is positioned at the center of the turntable. This is a cause of lowering the accuracy. At the same time, the assembly process becomes complicated, causing a problem of cost increase.

In the conventional centering spring 6, the distance from the fulcrum 6b to the second tapered portion 6d is short.
When the load applied to the fulcrum 6b increases and a repeated load due to the insertion and removal of the disk D is applied to the fulcrum 6b,
There was a problem that b became fatigued and easily broken.

Since the distance from the fulcrum 6b to the second tapered portion 6d is short, the spring constant of the first and second tapered portions 6c and 6d, which are the arm portions, is increased to secure the centering force. Need arises. For this reason, variations in the disc centering force generated in the tapered portion due to dimensional variations are increased, and the disc centering accuracy is deteriorated, which may cause a read error.

Further, if the spring constant is increased by using the synthetic resin material such as polycarbonate to secure the centering force, the stress for maintaining the disk for a long time in a high temperature environment is applied. This causes creep deformation of the spring portion. As a result, the centering mechanism is significantly impaired.

On the other hand, polycarbonate reinforced with glass fiber has some improvement in creep deformation,
It is not enough when high centering accuracy is required. Further, since the molding has a large anisotropy of shrinkage, there is a problem that it is difficult to obtain sufficient dimensional accuracy for recent high speed and high density.

An object of the present invention is to solve such a conventional problem, and has a centering function for preventing eccentricity of a disk by an inexpensive means, and is excellent in dimensional accuracy. Is to provide.

[0021]

SUMMARY OF THE INVENTION The present invention is a turntable device, and has the following configuration to solve the above-mentioned technical problem. That is, the present invention is a turntable device for accurately aligning and positioning a disk having a center hole rotatably in a drive, the turntable device supporting a peripheral surface of the center hole of the disk. And a centering portion that fits into the center hole of the disc, and a centering portion that centers the center of the disc and the centering portion of the disc, and includes a turntable portion, a centering portion, and a centering portion. At least one
One is characterized by being formed from an amorphous thermoplastic resin material having a glass transition temperature (Tg) of 170 ° C. or higher.

In the turntable device according to the present invention having the above-described structure, two or all of the components including the alignment portion among the turntable portion, the center ring portion, and the alignment portion are replaced by a glass transition. Temperature (Tg) is 1
It is also preferable to mold with a non-crystalline thermoplastic resin material of 70 ° C. or higher, and, of the turntable part, the centering part, and the alignment part, two or all of the constituent elements including the alignment part. , Glass transition temperature (Tg) of 17
It is also preferable to integrally mold with a non-crystalline thermoplastic resin material of 0 ° C. or higher.

<Additional Configuration in the Present Invention> The turntable device of the present invention includes the above-mentioned essential components, but is established even when the following components are further added to the components. . The additional components are:
A plurality of slits formed radially across the turntable portion and the center ring portion and formed at intervals in a circumferential direction, and arranged in the slits, one end of which is integrally formed with the turntable portion; A plate-shaped spring portion provided with a centering portion at the distal end thereof, the centering portion being provided in the center hole of the disk. It is characterized in that it is located at a position where it slides in relative contact with the inner peripheral edge.

<Concrete Configuration of the Present Invention> The turntable device of the present invention comprises the above-mentioned essential components, but is established even when the components are specifically as follows. The specific constituent element is characterized in that the amorphous thermoplastic resin material is a resin material containing polyethersulfone as a main component.

In this case, the amorphous thermoplastic resin material
The ratio of the shrinkage in the direction perpendicular to the flow direction to the flow direction is
It is preferably 3.0 or less. The flexural modulus of the amorphous thermoplastic resin material is 20,000 kg / cm ^2.
As described above, it is preferable that the content is not more than 80000 Kg / cm ² , and further, the amorphous thermoplastic resin material is obtained by adding an inorganic or organic filler having an isotropic shape such as spherical or amorphous to thermoplastic resin 1. It is preferably a thermoplastic resin composition containing 0.1 to 200 parts by weight.

In such a turntable device of the present invention, it is preferable that the molding of the two constituent elements including the alignment part or all the constituent elements by the amorphous thermoplastic resin material is performed by injection molding. In the turntable device of the present invention, it is preferable that the disk is a disk for storing information.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a turntable device according to the present invention will be described in more detail with reference to an embodiment shown in the drawings. (Turntable device) As a specific configuration of the turntable device of the present invention, for example, a turntable disclosed in Japanese Patent Application No. 10-288050 can be used. FIG. 1 is a plan view of a turntable device 10 for an information storage disk according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the turntable 10 of FIG. 1 cut along line 2-2. 3 is a bottom view of the turntable 10 shown in FIG.

The turntable device 10 of this embodiment
Is a disk-shaped turntable section 11 for supporting the peripheral surface of the center hole of the information storage disk D, and a turntable for supporting the information storage disk D in the center hole of the information storage disk D when the turntable device 10 supports the information storage disk D. A center ring portion 12 provided at the center of the upper surface (the surface on the information storage disk side) of the table portion 11; A socket portion 13 for fitting one end portion is formed.

The turntable portion 11 and the center ring portion 12 are integrally molded as a resin molded product using a mold or the like. When the turntable portion 11 and the center ring portion 12 are integrally formed, the rotating shaft S may be arranged in a molding die, and the rotating shaft S may be attached to the socket 13 simultaneously with molding. The turntable device 10 includes a turntable unit 11 and a centering unit 1.
2 and a plurality of slits 14 are formed radially and spaced apart in the circumferential direction.

Each of the slits 14 has one end integrally connected to the turntable portion 11 and the other end extending to the radially inward center ring portion 12 with a spring portion having a centering portion (hereinafter simply referred to as a spring portion). 15) are disposed.
This spring portion 15 is also formed integrally with the turntable portion 11.

Each of these spring portions 15 is located within the slit 14 of the turntable portion 11 and has a plate-like body 15a having flexibility and a claw portion 1 formed at the other end portion.
5b. The claw portion 15b is formed so as to rise along the axial direction of the rotation shaft toward the upper surface side of the turntable portion 11 at the tip end of the plate-like body 15a and protrude from the slit.

Accordingly, the plurality of claw portions 15b are arranged on a virtual circle centered on the center axis of the rotation axis S, and each claw portion 15b when viewed from the outside of this virtual circle, that is, from the radially outer side.
Is formed by a curved tapered surface 15c corresponding to a part of the outer peripheral surface of a virtual cone having the center axis of the rotation axis S as the same center line. The claw portion 15b having such a curved tapered surface 15c is a centering portion.

It is necessary that at least three or more such spring portions 15 be provided in the circumferential direction for effective alignment of the information storage disk D, but the number is particularly limited. Not something. In other words, in order to enhance the support stability of the information storage disk D, it is preferable that an odd number of the information storage disks D are provided at equally-spaced corners.

On the outer periphery of the upper surface of the turntable 11,
As in the related art, a rubber ring 16 for directly receiving the peripheral surface of the center hole of the information storage disk D is fixed by, for example, an adhesive. A ring-shaped recess 17 is formed on the upper surface of the centering portion 12 around the center axis of the rotation axis S, as in the related art. A metal ring or ring-shaped magnet 18 to be held at 10 is arranged and fixed in the recess 17.

Next, the operation of the thus configured turntable device 10 for an information storage disk will be described. When the information storage disk D is mounted on the turntable device 10, the centering portion 12 is relatively inserted into the center hole, and the inner peripheral edge of the center hole is formed at the tip of the spring portion 15 at the same time. Core or claw 15b
To the curved tapered surface 15c.

A curved tapered surface 15c which is a contact surface of the claw portion 15b with the inner peripheral edge of the center hole of the information storage disk.
Is formed so as to correspond to a part of the outer peripheral surface of a virtual cone having a center line coinciding with the center axis of the rotation axis S, so that the inner peripheral edge of the center hole of the information storage disk D comes into contact with Alignment of the information storage disk D starts.

After completion of the alignment, the pawl portion 15b is pushed down as shown in FIG.
bend a. If the diameter of the center hole of the information storage disk D is small within the range of the tolerance, the spring 15
Is relatively large, and when the diameter of the center hole is large within the range of the tolerance,
This amount of deflection is relatively small.

In any case, the bending force of the plate-like body 15a becomes an acting force of the claw portion 15b always trying to enter the center hole of the information storage disk D, so that the centering action is maintained. Since such a spring portion 15 is formed so that the plate-like body 15a constituting the spring portion 15 extends radially inward with the radially outward side of the turntable portion 11 as a base, the overall length of the spring portion 15 is compared. Can be taken longer.

Therefore, the plate-like member 15a can exhibit an appropriate flexibility without applying a large load to the claw portion 15b. That is, the internal stress in the plate-like body 15a of the spring portion 15 can be suppressed, in other words, the sensitivity of the stress to the external force can be reduced, and the centering accuracy when the spring portion 15 is bent can be further improved. Can be improved.

(Molding Material) The resin material used in the turntable device 10 of the present invention has a glass transition temperature Tg of 17
A non-crystalline thermoplastic resin material having a temperature of 0 ° C. or higher. Specific examples include polysulfone, polyethersulfone, polyphenylsulfone, polyetherimide, polyarylate, and the like. A turntable device used in a sealed information storage / reproducing device is exposed to a high-temperature environment, and a Tg is lower than a spring portion to which stress is constantly applied in the turntable device. The creep deformation of the spring portion increases, and the spring function is significantly impaired, adversely affecting the centering function.

Among the above resin materials, polyethersulfone is desirable in view of long-term stability of spring property and moldability. The resin material used in the turntable device 10 of the present invention preferably has a small ratio of molding shrinkage in the flow direction (hereinafter, vertical direction) during molding and the direction perpendicular to the flow direction (hereinafter, horizontal direction). .

That is, 2 m having a film gate
m sheet, 100 mm square sheet-shaped injection molded product,
When the contraction ratio in the vertical direction is 1, the contraction ratio in the horizontal direction is desirably 3.0 or less (preferably 2.0 or less). If the warp ratio of the shrinkage ratio is larger than this, undulation in the circumferential direction of the disk occurs, and dimensional accuracy of the hole into which the motor shaft is inserted is impaired. Further, it is desirable that the shrinkage in the vertical direction be 0.5% or less, since good dimensional accuracy can be obtained.

Further, the resin material used for forming the turntable device of the present invention has a flexural modulus according to JIS-K7203 of 20,000 Kg / cm ² or more and 80,000 Kg.
g / cm ² or less (preferably 30,000 to 50,000K
g / cm ² ). If the flexural modulus is lower than this, deformation tends to occur when the motor shaft is inserted or when the disc is mounted. On the other hand, if it is higher than this, the rigidity of the spring portion becomes too large, which not only increases the force required for mounting the disk, but also causes damage to the spring portion. Although there is a means for optimizing the amount of deflection of the spring in order to prevent this, the allowable range of deflection is extremely narrow due to the high elastic modulus.

The resin material having the above-mentioned mechanical properties can be obtained by adding a filler having, for example, a particle shape or an isotropic shape such as an amorphous shape. Specifically, glass fillers such as glass beads, glass powder, glass balloons, carbon fillers such as carbon black and particulate carbon, calcium carbonate, alumina, aluminum borate, zinc oxide, zinc sulfide, titanium oxide, etc. Examples include amorphous or spherical inorganic fillers, and organic fillers such as wholly aromatic liquid crystalline resins and aramid resins.

The above filler has an average particle size of 0.01 to
500 μm (preferably 1 to 100 μm) is desirable.
The amount of the filler is 0.1 to 200 parts by weight (preferably 1 to 100 parts by weight, more preferably 5 to 80 parts by weight) based on 100 parts by weight of the thermoplastic resin. If the amount is less than this range, the effect of improving the molding shrinkage and the elastic modulus is not exhibited, while if it is too large, the moldability is significantly reduced.

These resin compositions to be used may contain additional components as required. For example, glass fiber, carbon fiber, silica fiber, silica-alumina fiber,
Inorganic fibrous reinforcing materials such as potassium titanate fiber, aluminum borate fiber, stainless steel fiber, aluminum fiber, etc.
Aramid fibers, polyimide fibers, organic fibrous reinforcing materials such as fluororesin fibers, inorganic fillers such as talc, mica, graphite, etc., solid lubricants such as fluororesin powder, graphite, molybdenum disulfide, plasticizers such as paraffin oil, Antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, neutralizers, lubricants, compatibilizers, antifogging agents, antiblocking agents, slip agents, dispersants, coloring agents, antibacterial agents, fluorescent brightening And various additives such as agents.

[0047]

EXAMPLES Next, examples of a tar table apparatus according to the present invention and comparative examples will be shown, but the present invention is not limited to these unless it exceeds the gist. (Example 1) Polyether sulfone (Sumitomo Chemical Co., Ltd.)
(Sumika Excel 4100G, Tg = 220 ° C.) manufactured by Injection Molding Co., Ltd., into a turntable shape shown in FIGS.

Example 2 100 parts by weight of the polyether sulfone used in Example 1 were mixed with glass beads (GB731A, manufactured by Toshiba Barotini, average particle size 3).
0 μm) 25 parts by weight were kneaded using a twin-screw kneading extruder,
Pellets of the resin composition were obtained. The obtained pellets were injection molded into a turntable shape shown in FIGS.

(Example 3) Glass beads (manufactured by Toshiba Barotini, G
B731A, 25 parts by weight of average particle diameter 30 μm) and 8 parts by weight of glass fiber (fiber diameter 12 μm, fiber length 6 mm, aminosilane treatment) were kneaded using a twin-screw kneading extruder to obtain a resin composition pellet. The obtained pellets were injection molded into a turntable shape shown in FIGS.

(Comparative Example 1) Using a polycarbonate resin (NOVAREX 7025A, manufactured by Mitsubishi Engineering Corporation), injection molding was performed into a turntable shape shown in FIGS.

Comparative Example 2 Glass fiber (fiber diameter: 12 μm, fiber length: 6 mm, epoxy silane treatment) was added to 100 parts by weight of the polycarbonate resin used in Comparative Example 1.
The parts by weight were kneaded using a twin-screw kneading extruder to obtain pellets of the resin composition. Using the obtained pellets, FIGS.
Injection molding was performed into the turntable shape shown in FIG.

The above-mentioned materials were evaluated by the following methods. The results are shown in Table 1. (Molding shrinkage) A 100 × 100 × 2 mmt sheet was obtained by injection molding with a film gate. 80mm for mold
The scribing of the interval is engraved and transferred to the resin molded product. The flow direction (vertical) and the vertical (horizontal) scribing interval of the molded product are measured with a projector, respectively. The shrinkage was calculated from the formula. Shrinkage (%) = (Distance between scribes of product) / (Distance between scribes of mold) × 100 (Flexural modulus) Based on JIS-K7203.

[0053]

[Table 1]

Next, the turntable-shaped molded products shown in FIGS. 1 to 3 were evaluated as follows, and the results are shown in Table 2. (Surface accuracy evaluation method) The rotating shaft S shown in FIG. 2 was fitted into a turntable, and the rotating shaft S was chucked. Thereafter, the turntable was rotated with reference to the rotation axis S, and a sensor for detecting vertical displacement was placed on the upper surface of the rubber ring 11 of the turntable, and the amount of change was measured. The difference between the maximum value and the minimum value of the obtained displacement amount was calculated to obtain the surface accuracy. (That is, the smaller the numerical value, the better the surface accuracy.)

(Method of Evaluating Spring Residual Deformation Rate) An information storage disk is set on the turntable, and the plate-like portion 15b shown in FIG. 2 is pressed down as shown in FIG. And the height protruding from the surface 20 (H1)
Was measured using a coordinate measuring machine. Thereafter, with the information storage disk set, the humidity is set to 60 ° C. and the humidity is set to 90 ° C.
% For 1 week. After that, the information storage disk is removed, and the portion 15b does not return to the upper side.
The height protruding below 0 was measured with a coordinate measuring machine as H2 (not shown), and the ratio (H2 //) to the initial height (H1) was measured.
H1) was calculated to obtain a spring portion residual deformation rate. (That is, the smaller the numerical value of H2 / H1, the smaller the creep deformation and the better the long-term stability of the alignment function.)

[0056]

[Table 2]

In each of the above-described embodiments of the turntable device according to the present invention, an example in which pellets of the resin composition are used and injection-molded into a turntable shape shown in FIGS. The present invention is not limited to molding into a turntable shape by injection molding, and the same effects can be obtained even when molding is performed using a known molding technique typified by extrusion molding, blow molding or calender molding. It goes without saying that it plays.

[0058]

As described above, according to the turntable of the present invention, of the turntable portion, the centering portion, and the alignment portion, two or all of the components including the alignment portion are provided. By integrally molding the non-crystalline thermoplastic resin material by injection molding,
While reducing the manufacturing process cost,
The positional accuracy of the alignment part formed in the spring part can be greatly improved.

Further, Example 1 was used as a resin material for injection molding.
By using a non-crystalline thermoplastic resin material having a glass transition temperature (Tg) of 170 ° C. or higher as described in Nos. 1 to 3, not only the surface accuracy is excellent, but also the long-term stability of the spring function of the alignment part is extremely high. It has the effect of excellence.

[Brief description of the drawings]

FIG. 1 is a plan view showing a turntable device for an information storage disk according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the turntable device for an information storage disk shown in FIG. 1 cut along line 2-2.

FIG. 3 is a bottom view of the turntable device shown in FIG. 1;

FIG. 4 is a longitudinal sectional view of the turntable device shown in FIG. 1 cut along the line 2-2 in a state where the information storage disk is mounted.

FIG. 5 is a cross-sectional view showing a state where an information storage disk is not mounted on a conventional turntable.

FIG. 6 is a cross-sectional view showing a state where an information storage disk is mounted on a conventional turntable.

FIG. 7 is a perspective view showing a conventional turntable to which a center ring spring is attached.

[Explanation of symbols]

 D Information storage disk S Rotating shaft 10 Turntable device according to one embodiment 11 Turntable unit 12 Center ring unit 13 Socket unit 14 Slit 15 Spring unit 15a Plate portion 15b Claw portion 15c Curved tapered surface 16 Rubber ring 17 Concave portion 18 Ring-shaped magnet 19 clamper

Continued on the front page. (72) Inventor Motoyuki Aso 3-3-1-17 Ojida, Yokkaichi-shi, Mie Yuya Chemical Co., Ltd. Yokkaichi Plant (72) Inventor Shoichi Ikeda 3--17, Ojida, Yokkaichi-shi, Mie No. Yukaichi Plant, Yokkaichi Plant (72) Inventor Kazunobu Mizutani 3-3-1, Ojita, Yokkaichi City, Mie Prefecture F-Terminator inside Yokkaichi Plant, Yuka Chemical Co., Ltd. 5D038 BA04 CA03 CA03 HA01 HA10

Claims (10)

[Claims] 1. A turntable device for accurately aligning and positioning a disk having a center hole rotatably in a drive, the turntable supporting a peripheral surface of the center hole of the disk. A center ring portion that fits into a center hole of the disc; and a centering portion that centers the center of the disc and the center of the center ring portion. The turntable portion, the center ring portion, A turntable device, wherein at least one of the alignment parts is formed of an amorphous thermoplastic resin material having a glass transition temperature (Tg) of 170 ° C. or more. 2. The method according to claim 2, wherein the turntable section, the center ring section, and the alignment section include the alignment section.
The turntable device according to claim 1, wherein one or all of the components are formed of an amorphous thermoplastic resin material having a glass transition temperature (Tg) of 170 ° C or more. 3. The method according to claim 2, wherein the turntable section, the center ring section, and the alignment section include the alignment section.
The turntable device according to claim 1, wherein one or all of the components are integrally formed of a non-crystalline thermoplastic resin material having a glass transition temperature (Tg) of 170 ° C or higher. 4. A plurality of slits formed radially across the turntable portion and the center ring portion and formed at intervals in a circumferential direction, and are disposed in the slits, and one end of the slits is provided in the slit. A plate-like spring portion provided integrally with the table portion, the other end extending to the centering portion inward in the radial direction, and a tip end portion provided with the plate-shaped spring portion; The turntable device according to any one of claims 1 to 3, wherein the turntable device is located within the center hole of the disk while sliding relative to the inner peripheral edge thereof. 5. The turntable device according to claim 1, wherein the amorphous thermoplastic resin material is a resin material containing polyether sulfone as a main component. 6. The non-crystalline thermoplastic resin material has a shrinkage ratio in the direction perpendicular to the flowing direction to the direction of the flowing direction of 3.%.
The turntable device according to claim 1, wherein the value is 0 or less. 7. The non-crystalline thermoplastic resin material has a flexural modulus of not less than 20,000 kg / cm ^{2 and not} less than 80000 kg.
/ Cm ² or less, the turntable device according to claim 1. 8. The thermoplastic resin material according to claim 1, wherein the inorganic or organic filler having an isotropic shape such as spherical or amorphous is added to the thermoplastic resin 1 in an amount of 0.1 to 200.
The turntable device according to any one of claims 1 to 7, wherein the turntable device is a thermoplastic resin composition containing parts by weight. 9. The molding of the two or all of the constituent elements including the alignment part by the non-crystalline thermoplastic resin material is performed by injection molding.
The turntable device according to any one of the above. 10. The turntable device according to claim 1, wherein the disk is a disk for storing information.