KR20030094648A - Spindle motor for optical disk driver - Google Patents

Abstract

PURPOSE: A spindle motor for an optical disk driver is provided to secure a stabilized driving characteristic by interrupting eccentric force according to unbalance of a motor from being transmitted to a turntable. CONSTITUTION: A plate(11) is formed in a tube shape, and to which a holder(12) having an open top surface and a closed bottom surface is inserted. A core(14) is mounted at an outside diameter part of the plate. The plate includes a burring part(11') to which a bearing(13) is inserted. A rotor(17) includes a rotary shaft(15) rotatively inserted into the bearing, is combined with the rotary shaft to be rotated, and has magnets(18) arranged opposite to an outside diameter surface of the core. A turntable(20) has an assembling hole(21) at a center part(22). A rim of the center part is expanded to have a gap with one surface of the rotor, so that one surface of the turntable forms a flat surface to be closely attached with an optical disk(D). A damper(30) is interposed between the rotor and the turntable for absorbing vibration and noises generated from the rotor and the turntable.

Description

Spindle motor for optical disk driver

The present invention relates to a spindle motor for rotating an optical disc, and more particularly, to a spindle motor for an optical disc driver that can reduce noise and vibration by compensating eccentric force generated during rotation of an eccentric disc.

In general, optical disks have the advantages of relatively high density recording and reproducibility and semi-permanent storage compared to magnetic recording tapes and LPs. There is a trend.

Such optical disk applications include a laser disk player, a compact disk player and a digital versatile disc. Among these optical disk applications, the size of the optical disk application is particularly small and portable. Although a compact disc player capable of being used is widely available, in recent years, a DVD having a larger storage capacity and the same size as a compact disc is rapidly spreading.

In such an optical disk application, one of the most important factors is a spindle motor for a driver for rotating a disk at high speed without flow, and in order to rotate the disk at high speed without flow, a disk with durability of the spindle motor is required. It can be said that it is important to maintain a stable balance according to the high-speed rotation of the turntable is seated.

1 is a cross-sectional view showing a spindle motor for an optical disk driver according to the prior art.

As shown in the figure, the spindle motor for the optical disc driver is a motor 100 for generating a driving force, and a turntable 200 for high speed rotation in a state in which the optical disc is mounted while being supported by the rotation shaft 150 of the motor 100. Is done.

The motor 100 has a burring part 110 'which protrudes upward from the central part of the plate-shaped plate 110 in a tubular shape, and at this time, an upper surface thereof is opened below the burring part 110'. While being the bottom is a configuration that is fitted with a closed cylindrical holder (120). The metal bearing 130 is press-fitted into the inner space formed by the burring part 110 ′ and the holder 120, and a coil 140 wound around the outer circumferential end of the burring part 110 ′. ) Is fixedly mounted.

On the other hand, the rotating shaft 150 is inserted into the center of the bearing 130 is rotatably supported, the rotating shaft 150 is provided with a thrust washer 160 is fitted to the outer periphery of the lower end.

In addition, the rotor 170 is integrally coupled to the upper end of the rotating shaft 150 and rotated. The rotor 170 is provided in a downwardly open cap shape, and the inner end surface of the extended end of the rotor 170 is rotated. The cylindrical magnet 180 is fixed to face the outer diameter surface of the core 140 with an air gap.

In the motor 100 having such a configuration, when power is applied to the core 140 from the outside, the rotor 170 to which the magnet 180 is attached is formed by an electromagnetic force generated between the core 140 and the magnet 180. Is rotated, thereby the rotation shaft 150 coupled with the rotor 170 is supported by the bearing 130 to achieve a rotation at the same time.

On the other hand, the turntable 200 which is integrally rotated with the rotation shaft 150 of the motor 100 has a central portion 220 protrudes so that the optical disk (D) can be mounted on the upper end portion of the turntable 200 is one surface of the optical disk (D) It is provided in a form that is extended to have a flat surface in close contact.

The turntable 200 configured as described above has a periphery around the rotation axis 150 as shown in the drawing to compensate for eccentricity due to eccentricity and self-eccentricity of the optical disk D according to mechanical assembly or spreading. An annular groove 230 is formed, and a plurality of spherical balls 240 are provided in the groove 230. That is, when the turntable 200 makes an eccentric rotation, the plurality of balls 240 move in a eccentric direction along the groove 230 to compensate for the eccentricity of the turntable 200 by generating a repulsive centrifugal force. Will be.

On the other hand, the center portion 220 of the turntable 200 is a configuration in which an assembly hole 210 having an inner diameter corresponding to the outer diameter of the rotary shaft 150 is formed so that the upper end of the rotary shaft 150 is fitted by pressing.

Here, since the turntable 200 is usually formed of a metal material, the assembly with the rotary shaft 150 may be performed through forced indentation or adhesive.

Reference numeral 250 denotes a disk clamp which prevents the flow of the optical disk d by being coupled to the upper surface of the turntable by mechanical or magnetic force.

However, in the spindle motor for the optical disk driver configured as described above, the eccentricity caused by the unbalance of the turntable or the optical disk is compensated for by using a mass provided in the turntable, that is, a repulsive centrifugal force generated by a plurality of balls. Complex eccentricity due to assembly dispersion with and eccentricity due to unbalance of the motor itself is not able to compensate.

Most of the eccentric force is non-directional and irregular, so when the turntable rotates at a high speed, more noise and vibration are generated, and even when the turntable operation is completed, the total vibration value increases, resulting in a deviation. It is severely generated, resulting in a problem that the quality and reliability of the product is greatly degraded.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a spindle motor for an optical disk driver that can maintain a stable driving characteristics by compensating the eccentric rotation of the turntable by the self-unbalance of the motor. have.

1 is a cross-sectional view showing a spindle motor for an optical disk driver according to the prior art.

2 is a cross-sectional view showing a first embodiment of a spindle motor for an optical disk driver according to the present invention;

3 is a cross-sectional view showing another embodiment of FIG.

<Explanation of symbols for the main parts of the drawings>

10 motor 11: plate

11 ': Burring portion 12: holder

13: bearing 14: core

15: shaft 16: washer

17: rotor 18: magnet

20 turntable 21 assembly hole

22: center 23: home

24 ball 25 disc clamp

30: damper (rubber) 31: damper (synthetic resin)

D: optical disc

Spindle motor for an optical disc driver according to the present invention for realizing the above object is provided in a tubular shape, the upper surface is opened to the lower side, the bottom is fitted with a blocked holder, the core is mounted on the outer diameter portion, the bearing is press-fitted on the inner diameter portion A plate having a burring part to be rotated, a rotating shaft rotatably inserted into the bearing, and a cap shape in which the outer peripheral end thereof is integrally rotated by being integrally coupled to the upper end of the rotating shaft, and having an outer diameter surface of the core. A rotor having magnets arranged to face each other with a gap therebetween, and an assembling hole in which an upper end of the rotating shaft is press-fitted are provided at the center projecting upward and downward, and the periphery of the center portion extends while having a gap with one side of the rotor. The turntable which forms a flat surface to closely adhere the optical disk, and the vibration and noise generated from the rotor and the turntable And a damper interposed in the space between the rotor and the turntable so as to be absorbed and reduced.

As a preferable feature of the present invention, the damper is characterized in that the synthetic resin.

As another preferable feature of the present invention, the damper is characterized in that the rubber material is attached to the rotor and the turntable by an adhesive.

As another preferable feature of the present invention, the burring portion is provided in which the outer periphery of the lower end is fitted into a hole provided in the plate shape plate.

As another preferable feature of the present invention, the burring portion is formed to protrude in a tubular shape in the plate-shaped plate.

Another embodiment of the spindle motor for an optical disk driver according to the present invention is provided in a tubular shape, the upper surface is opened to the lower side, while the bottom is fitted with a closed holder, the outer diameter portion is equipped with a core and the inner diameter portion of the bearing ring press-in the burring A plate having a portion, a rotating shaft rotatably inserted into the bearing, and a cap shape in which the outer peripheral end portion is integrally coupled to the upper end of the rotating shaft and the cap is extended downward, and the outer diameter surface of the core and the air gap A rotor having magnets disposed opposite to each other and an assembly hole through which an upper end of the rotating shaft is pressed into a central portion protruding upward and downward are penetrated. The peripheral portion of the central portion extends with a gap between one side of the rotor and is subjected to centrifugal force inside the rotor. A turntable provided with a plurality of balls to generate a repulsive centrifugal force along the groove, the rotor and the turntable It characterized by consisting of a damper interposed in the space between the rotor and the turntable to absorb and reduce the noise and vibration generated from.

As a preferable feature of the present invention, the damper is characterized in that the synthetic resin.

As another preferable feature of the present invention, the damper is characterized in that the rubber material is attached to the rotor and the turntable by an adhesive.

As another preferable feature of the present invention, the burring portion is provided in which the outer periphery of the lower end is fitted into a hole provided in the plate shape plate.

As another preferable feature of the present invention, the burring portion is formed to protrude in a tubular shape in the plate-shaped plate.

Hereinafter, a preferred embodiment of a spindle motor for an optical disk driver according to the present invention will be described with reference to the accompanying drawings.

2 is a cross-sectional view showing a first embodiment of a spindle motor for an optical disk driver according to the present invention.

As shown in the drawing, the optical disk driver spindle motor includes a motor 10 which generates rotational force by large power supply, and a turntable 20 on which the optical disk D is mounted while being rotated integrally with the motor 10. The motor 10 includes a stator composed of a plate 11, a bearing 13, and a core 14, and a rotation composed of a rotation shaft 15, a rotor 17, and a magnet 18. It is roughly classified as the former.

That is, the stator includes a plate-shaped plate 11, in which the plate 11 is provided with a burring portion 11 'having a tubular shape at the center thereof.

At this time, the burring portion 11 'is integrally formed by a burring process that protrudes upward from the plate-shaped plate center portion as shown in the drawing, or a burring portion having a tubular shape although not shown in the drawing. It may be provided in a structure for fitting into the hole formed in the plate-shaped plate.

As such, the upper surface is opened to the lower side of the burring portion 11 'provided integrally or in an assembly structure to the plate 11, and a space is formed therein by inserting a cylindrical holder 12, the bottom of which is blocked. The metal bearing 13 is press-fitted in this internal space. In addition, the outer diameter portion of the burring portion (11 ') is a configuration in which the core 14 is wound around the coil around the outer periphery end fixedly mounted, the core 14 at this time is a structure that is selectively supplied with power from the outside.

On the other hand, the rotating shaft 15 of one element constituting the rotor is inserted into the center of the bearing 13 is rotatably provided, the thrust washer 16 is fitted to the lower end of the rotating shaft (15).

At this time, the rotor 17 is integrally coupled to the upper end of the rotary shaft 15 to form a rotation, the rotor 17 at this time is provided in the shape of a cap (cap) with the outer peripheral end is extended, extending As the inner diameter surface of the end, a cylindrical magnet 18 in which N-S poles are alternately magnetized is fixed. Such a magnet 18 faces an air gap with the outer diameter surface of the core 14 described above. Is placed.

The turntable 20 is located above the rotor 17 of the motor 10 at a predetermined interval with the bar, and is coupled to the upper end of the rotation shaft to form an integral rotation. That is, the turntable 20 has a structure in which the central portion 22 protrudes in the upward and downward directions, and the main surface of the central portion 22 is formed to extend outwardly. Looking at it as follows.

As described above, the turntable 20 has a central hole 22 protruding upward and downward, and an assembly hole 21 is formed therethrough so that the upper end of the front shaft 15 can be pressed into the center thereof. The periphery of the is provided with an expanding structure. At this time, the upper surface of the extended peripheral portion, that is, the target surface on which the optical disk (D) is placed is formed flat.

On the other hand, the turntable 20 generates a repulsive centrifugal force by the centrifugal force at the periphery of the rotating shaft to compensate for the eccentricity due to unbalance of the turntable 20 and the optical disk D and the plurality of balls 24. It is made.

Reference numeral 25 is a disk clamp for chucking to prevent the flow of the optical disk d.

This configuration is similar to the structure of the spindle motor for optical disk drivers. However, the present invention has the most prominent feature in that a damper is provided between the motor and the turntable to compensate for the eccentric force caused by the unbalance generated in the motor and the turntable while simultaneously absorbing and reducing vibration and noise.

That is, as shown in FIG. 2, the present invention includes a damper 30 as a cushioning material in a space formed between the bottom surface of the turntable 20 and the upper surface of the rotor 17. ) Is usually used a rubber material having excellent elasticity.

The damper 30 configured as described above may be variously modified if the damper 30 has a structural feature interposed in the space between the turntable 20 and the rotor 17 to absorb and absorb vibration and noise. .

For example, the damper 30 is provided in the form of a ring having a larger diameter than the diameter of the rotary shaft 15 and smaller than the diameter of the turntable 20 or the rotor 17, or several small It may be provided in a size and may be provided in a form interposed at a plurality of points in the space between the turntable 20 and the rotor 17.

The damper 30 is configured as described above is usually fixed by the adhesive bar, the bonding method may be made as follows.

That is, the adhesive is limited to one of the upper and lower surfaces of the damper 30 to be attached to the target surface opposite to the surface to which the adhesive is applied, or the adhesive is applied to the upper and lower surfaces of the damper 30. Thus, the bottom surface of the turntable 20 and the upper surface of the rotor 17 may be attached and fixed at the same time.

Meanwhile, the present invention proposes that the damper 30 is formed of a rubber material, but the present invention is not limited thereto, and the damper 30 may have various properties as long as the damper 30 absorbs vibration and noise while retaining elastic force. May be used.

For example, as shown in FIG. 3, the damper 31 may be an adhesive or an adhesive synthetic resin.

Spindle motor for an optical disk (D) driver according to the present invention configured as described above is a motor by the configuration that the damper 30, 31 having an elastic force is interposed between the rotor 17 and the turntable 20 of the rotating body It is suppressed that the eccentric force due to self unbalance of (10) is transmitted to the turntable 20.

In addition, the vibration and noise generated by the motor 10 or the turntable 20 is buffered through the damper 30, and thus absorbed and reduced, thereby preventing the optical disk D from being rotated irregularly by vibration.

On the other hand, the above-described embodiment is merely described one preferred embodiment of the present invention, the scope of application of the present invention is not limited to such, and can be changed as appropriate within the scope of the same idea. For example, the shape and structure of each component shown in the embodiment of the present invention can be modified.

The spindle motor for an optical disk driver according to the present invention constructed and operated as described above has a stable driving characteristic because the eccentric force according to the self-unbalance of the motor can be prevented from being transmitted to the turntable by a simple structure through a damper. Guaranteed.

Therefore, the optical disk mounted on the turntable can achieve stable high-speed rotation, thereby improving the recognition rate of the media, and greatly reducing vibration and noise compared to the past, thereby greatly improving product quality and reliability. It is effective to let.

Claims (10)

A plate having a tubular shape and having an upper surface open to the lower side thereof with a closed holder fitted thereon, an outer diameter portion having a core, and an inner diameter portion having a burring portion in which bearings are press-fitted; The rotating shaft is rotatably inserted into the bearing and the cap is rotated integrally coupled to the upper end of the rotary shaft and the outer peripheral end portion is extended downwardly, and the magnet is disposed opposite the outer diameter surface of the core with a gap on the inner diameter surface of the extension end. A rotor having a; An assembly hole in which an upper end of the rotating shaft is press-fitted is provided at a central portion protruding upward and downward, and a periphery of the central portion is extended while having a gap with one surface of the rotor, and one surface thereof includes a turntable for forming a flat surface in close contact with the optical disk; A damper interposed in the space between the rotor and the turntable to absorb and reduce vibration and noise generated by the rotor and the turntable; Spindle motor for an optical disk driver, characterized in that consisting of. The spindle motor of claim 1, wherein the damper is a synthetic resin. The spindle motor of claim 1, wherein the damper is a rubber material attached to the rotor and the turntable by an adhesive. The method of claim 1, wherein the burring portion, Spindle motor for an optical disk driver, characterized in that the outer periphery of the lower end is fitted into the hole provided in the plate-shaped plate. The spindle motor for an optical disc driver according to claim 1, wherein the burring portion is formed to protrude in a tubular shape from a plate plate. A plate having a tubular shape and having an upper surface open to the lower side thereof with a closed holder fitted thereon, an outer diameter portion having a core, and an inner diameter portion having a burring portion in which bearings are press-fitted; The rotating shaft is rotatably inserted into the bearing and the cap is rotated integrally coupled to the upper end of the rotary shaft and the outer peripheral end portion is extended downwardly, and the magnet is disposed opposite the outer diameter surface of the core with a gap on the inner diameter surface of the extension end. A rotor having a; The assembly hole through which the upper end of the rotating shaft is pushed in the center protruding up and down is penetrated, and the peripheral part of the center extends with a gap with one side of the rotor, and there are a plurality of balls that generate a repulsion centrifugal force by centrifugal force therein. A turntable provided to flow along; A damper interposed in a space between the rotor and the turntable to absorb and reduce noise and vibration generated from the rotor and the turntable; Spindle motor for an optical disk driver, characterized in that consisting of. 7. The spindle motor of claim 6, wherein the damper is made of synthetic resin. 7. The spindle motor of claim 6, wherein the damper is a rubber material attached to the rotor and the turntable by an adhesive. The method of claim 6, wherein the burring portion, Spindle motor for an optical disk driver, characterized in that the outer periphery of the lower end is fitted into the hole provided in the plate-shaped plate. The spindle motor of claim 6, wherein the burring portion is formed to protrude in a tubular shape from a plate plate.