JPH08147866A - Turntable rotating motor - Google Patents

Abstract

PURPOSE: To provide a turntable rotating motor capable of attaining a high precision by transmitting rotation to an information recording medium such as an optical disk without through a shaft with poor rigidity. CONSTITUTION: This motor is provided with a shaft 11, a magnetic rotor yoke 12 arranged around the shaft 11, a rotor magnet 13 set in the magnetic rotor yoke 12, a rotor part 10a fixed to the shaft 11 and provided with a turntable 14, a winding wire coil 17 and a stator part 10b provided with a bearing 19 for rotatably receiving the shaft 11. Then, the turntable 14 and the magnetic rotor yoke 12 are fixed integrally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a turntable rotating motor for mounting and rotating an information recording medium such as an optical disk such as a CD-ROM.

[0002]

2. Description of the Related Art A motor for rotating an information recording medium such as an optical disk has a structure as shown in FIG.
The spindle motor 120 has a rotor portion 120a and a stator portion 120b. The rotor portion 120a has a shaft 1
The optical disc 150 is mounted on the turntable 124 fixed to the optical disc 21. Axis 121
A rotor yoke 122 is fixed to the rotor yoke 122, and a rotor magnet 123 is attached to the inner peripheral side of the rotor yoke 122.

On the other hand, in the stator portion 120b, a bearing holder 126 is attached to a stator substrate 125, and the bearing holder 126 is provided with a bearing 129. The bearing 129 rotatably supports the shaft 121. The winding coil 127 is used in the bearing holder 12
It is attached to 6. The lower end of the shaft 121 is supported by the thrust receiver 128. In such a structure of the conventional spindle motor 120, the rotor yoke 122
The turntable 124 and the turntable 124 are not directly fixed and are separate bodies, and the void B between the rotor yoke 122 and the turntable 124 is not filled with a reinforcing resin such as an adhesive.

[0004]

Therefore, the rotor portion 12 is
0a has the "stiffness in the torsional direction" because it is the thinnest part, shaft 1
It is governed by the rigidity of 21. For example, when miniaturization of the spindle motor 120 is required and the diameter of the shaft 121 must be reduced, the thin shaft 12 of the rotor portion 120a is required.
The rigidity of the rotor portion 120a is deteriorated by being controlled by the rigidity of No. 1 and the rotor portion 120a violently repeats torsional vibration. Information recording / reproducing apparatus, eg, high-speed CD-ROM, equipped with a conventional spindle motor 120
It is difficult for the drive device to read the information recorded on the CD-ROM with high accuracy. Especially, a CD-R that rotates a CD-ROM at double speed or quad speed
In the OM drive device, the CD-ROM is, for example, 400
Since the number of rotations from 1000 to 1000 becomes high speed, the vibration due to high speed increases in proportion to the square of the increase in speed. Therefore, the faster the CD-ROM is rotated,
The torsional vibration of the shaft 121 will increase.

Thus, the conventional spindle motor 12
At 0, since the void B between the rotor yoke 122 and the turntable 124 is not filled with the reinforcing material,
The rigidity of the rotor part 120a cannot be positively improved. As a result, since the rigidity of only the shaft 121 is relied upon, the conventional spindle motor 120 has a drawback that it is not suitable for the above-described CD-ROM drive device or the like that requires high accuracy. It is also possible to increase the rigidity of the rotor portion 120a of the stepping motor 120 by making the shaft 121 thicker. Increasing the size of 120 is inevitable.

Therefore, the present invention has been made to solve the above problems, and achieves high accuracy by transmitting rotation to an information recording medium such as an optical disk without passing through a shaft having poor rigidity. It is an object of the present invention to provide a turntable rotation motor capable of performing the above.

[0007]

According to the present invention, there is provided a motor for rotating a turntable for mounting an information recording medium, and a shaft and a magnetic rotor yoke arranged around the shaft as a rotation center. A rotor magnet set on the magnetic rotor yoke, a rotor unit including the turntable fixed to the shaft, a winding coil, and a stator unit including a bearing for rotatably receiving the shaft. The turntable and the magnetic rotor yoke are achieved by a turntable rotating motor that is integrally fixed. In the present invention, preferably, the turntable and the magnetic rotor yoke are integrally fixed by resin. In the present invention, preferably, the turntable and the magnetic rotor yoke are integrally fixed by an adhesive material.
In the present invention, preferably, the turntable and the magnetic rotor yoke are integrally fixed by press fitting. In the present invention, preferably, the turntable is integrally fixed to the magnetic rotor yoke by an outsert-molded resin. In the present invention, preferably, the resin is filled in the recess provided in the magnetic rotor yoke, and the turntable is fixed to the magnetic rotor yoke by the resin.

[0008]

According to the above structure, since the turntable and the magnetic rotor yoke are integrally fixed, the rotation can be transmitted to an information recording medium such as an optical disk without passing through a shaft having poor rigidity, and the rotation is high. The rotation can be accurately transmitted to the turntable. In the present invention, preferably, the turntable and the magnetic rotor yoke are integrally fixed with a resin, an adhesive material, or a press fit. As a result, both can be easily integrated. In the present invention, preferably, when the turntable is accurately positioned and fixed with respect to the magnetic rotor yoke, resin is filled in the recess provided in the magnetic rotor yoke and the turntable is fixed with the resin. can do.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

Embodiment 1 FIG. 1 shows a preferred embodiment 1 of the motor for rotating a turntable according to the present invention. In FIG. 1, a turntable rotating motor 10 is a spindle motor and has a rotor portion 10a and a stator portion 10b. The rotor portion 10a has a shaft 11, a magnetic rotor yoke 12, a rotor magnet 13, a turntable 14, and the like.
The stator portion 10b has a stator substrate 15, a bearing holder 16, an iron core 17, a winding coil 17, a thrust receiver 18, a bearing 19, and the like. The turntable 14 of the rotor portion 10a is fixed to the upper half position of the shaft 11 in FIG. The rotor yoke 12 is fixed to an intermediate position of the shaft 11 by, for example, press fitting. The rotor yoke 12 is a rotor yoke made of a magnetic material, and the rotor magnet 13 is arranged on the inner surface side thereof. The turntable 14 is a table for clamping a disc 50, which is an information recording medium such as a CD-ROM, and a resin F is filled in the space A between the turntable 14 and the rotor yoke 12.

By thus filling the space A between the rotor yoke 12 and the turntable 14 with the resin F, the rotor yoke 12 and the turntable 14 are directly and integrally fixed to each other in the twisting direction of the rotor portion 10a. It has excellent rigidity. That is, the spindle motor 1 of FIG.
In No. 0, the resin F is filled in the space A between the rotor yoke 12 and the turntable 14, and the rotor yoke 12 and the turntable 14 are directly and integrally coupled. Therefore, when the winding coil 17 is energized, the rotor yoke 12 The rotational force is transmitted from the rotor magnet 13 to the rotor yoke 12, the resin F, the turntable 14, and the disc 5
It becomes 0. Therefore, since the spindle motor 10 can rotate the disk 50 without directly interposing the shaft 11 having the least rigidity, the rotor portion 10a has excellent rigidity in the twisting direction.

On the other hand, in the conventional spindle motor 120 shown in FIG. 5, when the winding is energized, the rotor magnet 123 rotates. The rotational force generated in the rotor magnet 123 is transmitted from the rotor yoke 122 to the disk 150 via the shaft 121 and the turntable 124.
That is, in the conventional spindle motor 120, it is dominated by the shaft 121 which is the thinnest and has poor rigidity, resulting in poor rigidity. If the rigidity during rotation is poor as described above, the disk 150 vibrates violently, and it becomes difficult to accurately read information from the disk 150.
In the motor 10 according to the first embodiment of the present invention, the rotor yoke 12
When the space A of the turntable 14 is filled with the resin F, the motor 10 is required to be downsized, for example, and the shaft has to be reduced in diameter, or the motor 10 is rotated with a large moment of inertia. This is very effective when a large torsional vibration may occur, such as when the body has to be attached to the spindle motor 10.

On the other hand, the stator substrate 1 of the stator portion 10b
5, a bearing holder 16 is attached. The bearing holder 16 holds two bearings 19, 19. The thrust receiver 18 rotatably supports the lower end of the shaft 11. The iron core 17 is attached to the bearing holder 16 and faces the rotor magnet 13 of the rotor portion 10a.

Next, the operation of the first embodiment of the present invention will be described.
By supplying power to the winding coil 17 of the stator portion 10b from the outside, a magnetic field is generated in the winding coil 17, and the magnetic field lines pass through the iron core and from the rotor magnet 13 of the rotor portion 10a to the rotor yoke 12. Interact with magnetic lines of force. As a result, the rotor portion 10a moves to the shaft 11
The disk 50, which is rotated around the center of the table and is clamped to the turntable 14, is rotated at a predetermined speed. As already described, since the resin F is filled in the space A between the rotor yoke 12 and the turntable 14, the motor 10 of the first embodiment directly connects the rotor yoke 12 and the turntable 14 and has poor rigidity. Since the disk 50 can be rotated without passing through the shaft 11, the rigidity of the shaft 11 is not governed by the rigidity of the shaft 11 and the rigidity in the torsion direction is high. Therefore, the motor 10 of the first embodiment can cope with reading information on the disk 50 with high reading accuracy, and is particularly suitable as a motor of a CD-ROM drive device of 2 × speed or 4 × speed, for example.

Second Embodiment Next, FIG. 2 shows a second preferred embodiment of the turntable rotating motor according to the present invention. Regarding the components of the spindle motor 10 of the second embodiment shown in FIG. 2, the same parts as those of the spindle motor 10 of the first embodiment shown in FIG. Example 2 of FIG.
, The lower surface 34a of the turntable 34 of the rotor portion 10a is in close contact with the upper surface 32a of the rotor yoke 32, and the lower surface 34a and the upper surface 32a are made of the adhesive material G.
Are glued by. By doing so, the turntable 34 and the rotor yoke 32 can be more easily and directly fixed integrally.

Embodiment 3 FIG. 3 shows a preferred embodiment 3 of the motor for rotating a turntable according to the present invention. Regarding the components of the spindle motor 10 of the third embodiment shown in FIG. 3, the same components as those of the spindle motor 10 of the first embodiment shown in FIG. In FIG.
Characteristic is that the cylindrical portion 44a of the turntable 44
Is to be integrally fixed to the cylindrical portion 42a of the rotor yoke 42 by press fitting. If necessary, an adhesive material may be interposed between the cylindrical portion 44a and the cylindrical portion 42a.

Embodiment 4 FIG. 4 shows a further preferred embodiment 4 of the motor for rotating a turntable according to the present invention. Example 4 of FIG.
Concerning the constituent elements of the spindle motor 10 of FIG. 1, the same parts as those of the spindle motor 10 of the first embodiment shown in FIG. The characteristic feature of the fourth embodiment shown in FIG. 4 is the rotor yoke 52.
A concave portion 52a is formed in the central portion of, and the columnar portion 54a of the turntable 54 is integrally fixed to the concave portion 52a via a resin F. By providing the recess 52a in this manner, the resin F can be easily filled, and the turntable 54 can be accurately positioned and fixed to the rotor yoke 52. In the first to fourth embodiments, the turntables 14, 34, 44, 54 are molded of, for example, resin, preferably polycarbonate. On the other hand, the magnetic rotor yoke 12 is formed by punching out an iron plate, for example. As the resin or adhesive used, it is preferable to use a UV-curing type epoxy adhesive, and the use of this adhesive allows quick curing. Alternatively, a double-sided adhesive tape can be used as the adhesive material.

The present invention is not limited to the above embodiment. In the embodiment of FIGS. 1 to 4, the resin F or the adhesive material G may be outsert-molded, or the adhesive material G may be used.
May be applied. Further, the disk 50 that is the object to be rotated is not limited to the CD-ROM, and the motor of the present invention can be used to rotate other types of information recording media and other objects that need to rotate at high speed. Can be applied.

[0019]

As described above, according to the present invention, high precision can be achieved by transmitting rotation to an information recording medium such as an optical disk without passing through a shaft having poor rigidity.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first preferred embodiment of a turntable rotating motor according to the present invention.

FIG. 2 is a sectional view showing a second preferred embodiment of a turntable rotating motor according to the present invention.

FIG. 3 is a sectional view showing a preferred embodiment 3 of the motor for rotating a turntable according to the present invention.

FIG. 4 is a sectional view showing a fourth preferred embodiment of the turntable rotating motor of the present invention.

FIG. 5 is a cross-sectional view showing a conventional turntable rotation motor.

[Explanation of symbols]

 10 Motor 10a Rotor part 10b Stator part 11 Shaft 13 Rotor magnet 14,34,44,54 Turntable 12,32,42,52 Rotor yoke 17 Winding coil F Resin G Adhesive

Claims (6)

[Claims] 1. A motor for rotating a turntable for mounting an information recording medium, comprising: a shaft, a magnetic rotor yoke arranged with the shaft as a center of rotation, a rotor magnet set on the magnetic rotor yoke, and the shaft. A rotor unit having the fixed turntable; a winding coil; and a stator unit having a bearing for rotatably receiving the shaft, wherein the turntable and the magnetic rotor yoke are integrally fixed. A motor for rotating turntables. 2. The motor for rotating a turntable according to claim 1, wherein the turntable and the magnetic rotor yoke are integrally fixed by resin. 3. The turntable and the magnetic rotor yoke are integrally fixed by an adhesive material.
The motor for rotating the turntable described in. 4. The motor for rotating a turntable according to claim 1, wherein the turntable and the magnetic rotor yoke are integrally fixed by press fitting. 5. The motor for rotating a turntable according to claim 2, wherein the turntable is integrally fixed to the magnetic rotor yoke by an outsert-molded resin. 6. The turntable according to claim 1, wherein a recess provided in the magnetic rotor yoke is filled with the resin, and the turntable is fixed to the magnetic rotor yoke by the resin. Motor for rotation.