JPH1125555A - Turntable device of disk player and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turntable device of a disk player, which is capable of easily being assembled and is constituted so that the wobbling of the disk surface is little at the time of rotation of the turntable, and also the manufacture of this device. SOLUTION: As to this turntable device of the disk player, which is placed with the disk thereon and rotationally driven by a motor 2, and the manufacture of this device, the disk supporting surface for supporting the disk is formed from a frictional material 7 stuck to the turntable surface, and also the disk supporting surface is formed by the manufacturing method to machine this frictional material 7 so as to be the flat surface perpendicular to a rotational shaft of the turntable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable device used for a disk player for reproducing recorded information on a magnetic disk, an optical disk or the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A turntable device of a disk player for reproducing an information recording disk such as a magnetic disk or an optical disk is constituted by a turntable provided integrally with a spindle shaft of a spindle motor. In addition, the disc player clamps a central portion of the information recording disc mounted on the turntable by the clamper and the turntable, and rotates the information recording disc clamped by the turntable and the clamper by a spindle motor, thereby picking up the pickup. For example, the recording information recorded on the information recording surface of the rotating information recording disk is sequentially read out.

FIG. 3 shows an embodiment of a conventional turntable device, in which a sleeve 22 in which a bearing 21 of a spindle motor 20 is mounted is mounted on a motor base 10, and a stator coil 23 is mounted on the outer periphery thereof. It is fixed.

A tip end of a spindle shaft 24 rotatably supported by a bearing 21 is press-fitted into a center hole of a centering hub 27 of a resin turntable 25.
The centering hub 27 has a ring-shaped magnet 26
Are fixed integrally.

The outer periphery of the turntable 25 has a CD-
A ring-shaped non-slip member 28 for supporting a disk 40 such as a ROM or a DVD is attached, and forms a disk support surface of the turntable 25. The non-slip member 28 is formed, for example, by punching a rubber sheet or the like processed to a predetermined thickness into a ring shape. The non-slip member 28 is formed by using an adhesive member such as a double-sided adhesive sheet.
The disk 40 is attached to the outer peripheral portion of the turntable 25.
Is placed on the turntable 25, the disk 40
, And abuts against the central portion of the disk 40 to provide an anti-slip function.

On the lower surface of the turntable 25,
A yoke 30 constituting a rotor case 30c to which a ring-shaped rotor magnet 29 is fixed is attached inside. Further, the engagement member 31 fixed to the lower surface side of the centering hub 27 engages with the engagement piece 32 of the sleeve 22 to prevent the turntable 25 from coming off.

On the other hand, a metal plate 51 to be attracted to the magnet 26 is fixed to a center portion of a clamper 50 for holding the center portion of the disk 40 placed on the turntable 25 between the disk 40 and the turntable 25. Have been. The anti-slip member 2 on the lower surface side of the clamper 50
8, a pressing portion 52 is provided. At the time of clamping, the pressing portion 52 of the clamper 50 presses the center portion of the disk 40 against the turntable 25, so that the disk 40 is pressed against the turntable 25 and the clamper 50. They are clamped between them with a predetermined clamping force.

[0008]

The conventional turntable device is used in a disk player or the like constructed as described above. However, in order for the disk player to accurately reproduce the information recorded on the disk 40, the turntable device is required. It is necessary that the information recording surface of the disk 40 mounted on the disk 25 be supported so as to be perpendicular to the spindle shaft 24 of the spindle motor 20 and that the surface deflection of the disk 40 due to the rotation of the spindle shaft 24 be small. is there.

To this end, the disk supporting surface of the turntable 25 into which the tip of the spindle shaft 24 is press-fitted is
It must be formed with high precision so as to be perpendicular to the spindle shaft 24, and when assembling the turntable device under such conditions, it is relatively easily stretched and freely bent by a rubber sheet or the like. The operation of attaching the ring-shaped anti-slip member 28 to the outer peripheral portion of the turntable 25 is extremely difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a turntable device for a disk player, which can be easily assembled, has less surface runout of the disk when the turntable rotates, and a method of manufacturing the same. The purpose is to do.

[0011]

According to the first aspect of the present invention,
A turntable device of a disc player on which a disc is mounted and driven to rotate by a motor, wherein a disc support surface for supporting the disc is formed of a friction material attached to the turntable surface. .

According to a second aspect of the present invention, there is provided a turntable device for a disk player on which a disk is mounted and driven to rotate by a motor, wherein a disk supporting surface for supporting the disk is coated on the turntable surface. And the surface thereof is formed by a film of a friction material which is cut.

According to a third aspect of the present invention, in the turntable device for a disk player according to the first or second aspect, the disk supporting surface is provided with a friction material attached to the turntable surface with respect to a rotation shaft of the turntable. And is formed by cutting to become a vertical plane.

According to a fourth aspect of the present invention, in the turntable device for a disk player according to the third aspect, the cutting is performed by bringing the cutting means into contact with a friction material while the turntable is rotated by a motor. And tracing in a direction perpendicular to the rotation axis.

According to a fifth aspect of the present invention, in the turntable device for a disk player according to the first to fourth aspects, the friction material is a paint containing a polyester resin as a main component. .

According to a sixth aspect of the present invention, there is provided a method of manufacturing a turntable device of a disk player on which a disk is mounted and driven to rotate by a motor, wherein a first friction material is attached to the turntable surface. A disk supporting surface for supporting the disk is formed by the step and the second step of cutting the friction material while the turntable is driven to rotate.

According to a seventh aspect of the present invention, in the second step of the method of manufacturing a turntable device for a disc player according to the sixth aspect, the turntable is rotationally driven by a motor.

According to an eighth aspect of the present invention, in the second step of the method of manufacturing a turntable device for a disc player according to the sixth or seventh aspect, cutting is performed by:
The cutting means is brought into contact with the friction material and traced in a direction perpendicular to the rotation axis.

According to a ninth aspect of the present invention, in the method of manufacturing a turntable device for a disc player according to the sixth to eighth aspects, the friction material is a paint containing a polyester resin as a main component. Features.

[0020]

Since the present invention is constructed as described above, the perpendicularity of the disk support surface of the turntable to the spindle shaft can be accurately obtained, so that the disk runout during rotation of the turntable can be reduced. The disc can be played well.

[0021]

Next, a preferred embodiment of the present invention will be described below with reference to the drawings. In the drawings described below, portions common to FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a schematic sectional structural view of a main part of a turntable device of a disk player according to an embodiment of the present invention. A rotor case 1 of a motor 2 is formed by drawing press working of a metal plate.

The rotor case 1 has a cylindrical spindle shaft 1b integrally formed at the center of a yoke 1a, and a turntable 3 made of resin is provided on the upper surface side of the yoke 1a.
Are attached so as to be integrated with the rotor case 1. This attachment is performed by, for example, fitting the projection of the turntable 3 into the hole of the yoke 1 a of the rotor case 1 so that the lower surface of the turntable 3
a, the spindle shaft 1b is arranged so as to be substantially perpendicular to the surface of the turntable 3 on the surface on which the disk 40 is mounted. A rotor magnet 29 is fixed inside the yoke 1a.

At the center of the turntable 3, a disk 4
A centering hub 27 into which the 0 center hole fits is provided. The centering hub 27 is integrally provided with a magnet 4 for clamping, and a clamper 5 made of sheet metal.
Together with the disk 40. The clamper 5 has a shape to be fitted to the centering hub 27, and when the disc 40 is placed on the turntable 3, the clamper 5 is attracted to the magnet 4 to press the disc 40 against the turntable 3. To clamp (clamp) the disk 40.

Therefore, when the disc 40 shown in FIG. 1 is clamped, the turntable 3 receives the clamping force (ie, the attraction force between the clamper 5 and the magnet 4) and the weight of the disc 40 and the clamper 5.

On the other hand, a sleeve 22 in which a bearing 21 of the spindle motor 2 is mounted is attached to the motor base 10, and a stator coil 23 is fixed to the outer periphery thereof.
The spindle 22 is provided inside the sleeve 22.

The engaging member 31 fixed to the lower surface side of the centering hub 27 is
By engaging with 2, the turntable 3 is prevented from coming off.

A non-slip member 6 for supporting the disk 40 is formed on the outer periphery of the turntable 3. The non-slip member 6 is formed by coating a friction material 7 on a surface of the turntable 3 on which the disk 40 is mounted by a method described later and attaching the same, and then forming the friction material 7 into a film by cutting. And forms a disk support surface when the disk 40 is clamped.

The friction material 7 has sufficient friction so that the disc 40 does not slip on the turntable 3 when the disc player rotates and reproduces the disc 40 while holding the disc 40 with a predetermined clamping force. It is necessary to have a force, the influence of the material and the eccentricity of the disk 40, the clamping force of the disk player, the required frictional force is determined according to the setting of the maximum rotation speed and the maximum acceleration / deceleration of the disk, etc. The material of the friction material 7 is appropriately selected within a range suitable for these settings.

Further, since the friction material 7 is coated on the outer peripheral portion of the turntable 3 and adhered thereto, and then subjected to a cutting process by a method described later, it is necessary that the surface material has good workability. It is necessary that the material has a high hardness and a stable heat-blocking property against heat received from the surroundings.

Under such conditions, in the present embodiment, the friction material 7 uses a paint mainly composed of a polyester resin. Specifically, a paint obtained by appropriately mixing a polyester resin, an acrylic resin, beads, silicon powder, a curing agent, a solvent, and the like is used.

The turntable device is constructed as described above, supports the disk 40 mounted on the turntable 3 by the disk support surface, clamps the disk 40 in cooperation with the clamper 5 and drives the motor 2. Can be rotated by force.

Next, a method of manufacturing the turntable device will be described below. First, a suitable amount of a paint mainly composed of a polyester resin is coated on a surface of the turntable 3 on which the disk 40 is to be mounted, in advance, by solidifying the turntable 3 formed by resin molding or the like, and the friction material 7 is solidified. To adhere. Next, the turntable 3 is attached to the rotor case 1 to which the rotor magnet 29 is fixed, and is fixed so as to be integrated therewith.

FIG. 2 is a diagram showing a state in which the friction material 7 of the turntable device is being cut. Next, as shown in FIG. 2, the motor 2 is formed by mounting the spindle shaft 1b of the rotor case 1 to which the turntable 3 is integrally fixed in a sleeve 22 fixed to the motor base 10,
The motor base 10 of the motor 2 is fixed to the base 8.

Next, while rotating the rotor case 1 by driving the motor 2 thus formed, the cutting tool 9 is rotated.
Is brought into contact with the friction material 7, and the surface of the friction material 7 is cut by tracing in a direction perpendicular to the rotation axis X of the spindle 1b using a traverse device (not shown). In this case,
It is desirable that the rotor case 1 be rotated at a rotation speed higher than the maximum rotation speed required by the disc player using the motor 2.

As a result, the surface of the friction material 7 is shaved into a film having a plane perpendicular to the rotation axis, and the surface of the film forms a disk support surface for supporting the disk. As a result, the disk 40 of the turntable 3
The non-slip member 6 is formed on the surface on which the is mounted.

As described above, the turntable device is manufactured, and as a result, the disk supporting surface formed on the turntable 3 is accurately perpendicular to the spindle shaft 1b. Therefore, in the motor 2 using this turntable device, the runout of the disk 40 during rotation is reduced,
Even when the disk 40 is rotated at the maximum rotation speed by the disk player using the motor 2, the surface runout is small.

In this embodiment, since the friction material 7 is made of a paint containing a polyester-based resin as a main component, when the disc 40 is a CD-ROM or DVD having a diameter of about 12 cm, the disc 40 is not used. The clamping force (that is, the attraction force between the clamper 5 and the magnet 4) is set on the support surface of the turntable 3 of the clamped disc player so as to apply a load of about 350 g.
The slip limit torque of 0 can be about 600 g · cm or more.

Therefore, the motor 2 can also be set to a high starting torque, and as a result, the rotation control of the disk 40 during the reproduction of the disk 40 by the disk player becomes easy, and the reproduction start time in high-speed search, n-times speed reproduction, etc. Can be shortened.

As described above, the disk support surface is formed by coating the friction material 7 on the surface of the turntable 3 on which the disk 40 is mounted and solidifying the friction material 7 in advance, and then integrally forming the spindle shaft 1b. The mounted rotor case 1 is attached to the turntable 3, and the spindle shaft 1b is attached to the surface of the turntable 3 on which the disk 40 is mounted.
Is attached and fixed so as to be substantially vertical, and thereafter, while rotating the spindle shaft 1b, the friction material 7 is cut and the surface thereof is set as a plane perpendicular to the rotation axis X of the spindle shaft 1b, and the disk support surface is set. When the turntable 3 is integrally attached to the rotor case 1, the spindle shaft 1 b cannot obtain a strict verticality with respect to the surface of the turntable 3 on which the disk 40 is mounted. It is sufficient if the verticality can be obtained by cutting the friction material 7. Therefore, if this method is used, the mechanism provided for integrally attaching the turntable 3 to the rotor case 1 becomes simple and does not require much precision.

In the embodiment described above, when the non-slip member 6 is formed by cutting the friction material 7 coated on the turntable 3 integrally attached to the rotor case 1, the spindle of the rotor case 1 Axis 1
In the example described above, the motor 2 is formed by mounting the b inside the sleeve 22 fixed to the motor base 10, and the rotor 2 is rotated together with the turntable 3 by driving the motor 2. Even if the turntable 3 coated with the material 7 is mounted on a dedicated drive motor and rotated, sufficient accuracy that can be practically used can be obtained. In this case, the turntable 3 attached to the dedicated drive motor may be used while attached to the rotor case 1.

In this embodiment, the turntable 3
Although the turntable 3 is attached to the rotor case 1 after the friction material 7 is attached to the turntable 3, the friction material 7 may be attached to the turntable 3 after the turntable 3 is attached to the rotor case 1 in advance. . Further, in the present embodiment, the example in which the friction material 7 is coated and adhered to the outer peripheral portion of the turntable 3 has been described. Is also good.

The non-slip member 6 is not limited to the above-described example. For example, a rubber sheet or the like may be attached to the turntable 3 and then formed into a film by cutting using the above-described method. May be.

[0044]

According to the present invention, the perpendicularity of the disk support surface of the turntable with respect to the spindle shaft can be accurately obtained, so that the disk runout during rotation of the turntable can be reduced. In particular, for a disk suitable for a high-density medium such as a DVD, the surface runout can be suppressed very inexpensively and rationally, and the disk can be reproduced satisfactorily.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a main part of a turntable device of a disc player according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a state in which a friction material of the turntable device is being cut.

FIG. 3 is a diagram showing one form of a conventional turntable device.

[Explanation of symbols]

 1 ... Rotor case 1a ... Yoke 1b ... Spindle shaft 2 ... Motor 3 ... Turntable 4 ... Magnet 5 ... Clamper 6 ···· Non-slip member 7 ··· Friction material 8 ··· Base 9 ··· Tool bit 10 ··· Motor base 21 ··· Bearing 22 ··· Sleeve 23 ··· Stator coil 27 ··· Centering hub 29 ··· Rotor magnet 31 ··· Engaging member 32 ··· Engaging piece 40 ··· Disc

Claims (9)

[Claims] 1. A turntable device for a disc player on which a disc is mounted and which is rotationally driven by a motor, wherein a disc supporting surface for supporting the disc is formed of a friction material attached to the turntable surface. A turntable device for a disc player. 2. A turntable device of a disk player on which a disk is mounted and driven to rotate by a motor, wherein a disk support surface for supporting the disk is coated on the turntable surface and the surface is cut. A turntable device for a disc player, wherein the turntable device is formed of a film of a friction material formed. 3. The disk support surface is formed by cutting a friction material adhered to a turntable surface into a plane perpendicular to a rotation axis of the turntable. 3. The turntable device for a disc player according to 1 or 2. 4. The cutting process is performed by bringing a cutting unit into contact with the friction material and tracing in a direction perpendicular to the rotation axis while a turntable is rotationally driven by the motor. Claim 3 characterized by the following:
3. The turntable device for a disc player according to claim 1. 5. The turntable device for a disk player according to claim 1, wherein the friction material is a paint containing a polyester resin as a main component. 6. A method for manufacturing a turntable device for a disk player on which a disk is mounted and driven to rotate by a motor, comprising: a first step of attaching a friction material to a turntable surface; and rotating the turntable. A method of manufacturing a turntable device for a disk player, wherein a disk supporting surface for supporting a disk is formed by the second step of cutting the friction material while being driven. 7. The method according to claim 6, wherein in the second step, the turntable is driven to rotate by the motor. 8. The method according to claim 6, wherein, in the second step, the cutting is performed by contacting a cutting unit with the friction material and tracing the cutting means in a direction perpendicular to the rotation axis. 8. The method for manufacturing a turntable device for a disc player according to any one of claims 7 to 7. 9. The method according to claim 6, wherein the friction material is a paint containing a polyester resin as a main component.