KR20100077237A - Spindle motor, and information storage device using the spindle motor - Google Patents

Abstract

PURPOSE: A spindle motor and an information storage device using the spindle motor are provided to prevent a flowing to a radial direction of a rotary shaft by fixing a slide crone to a turn table. CONSTITUTION: A spindle motor comprises a rotary shaft(150), a slide cone(260), a turn-table(230), and a lever. The slide cone comprises a storage media contact unit and a cylindrical cone supporting unit. The turn-table comprises cylindrical storage media mounting unit, a cone receiving unit, and a shaft support. A lever has a bend body. The lever is formed in lower part of the slide cone to push up the slide cone by elastic force which is generated in space between the cone receiving unit and a slide cone.

Description

SPINDLE MOTOR, AND INFORMATION STORAGE DEVICE USING THE SPINDLE MOTOR}

The present invention relates to a spindle motor and an information storage device employing the same, wherein the center of rotation of the spindle motor and the center of rotation of the information storage medium can be automatically aligned while being able to easily mount and detach the information storage medium having the hollow portion. It relates to a spindle motor and a rotation information storage device employing the same.

In recent years, one of the obvious trends of optical disc drives has been to increase the rotation speed of optical discs such as CDs and DVDs. As the rotational speed of the optical disk increases, the centrifugal force of the disk is excessively increased for various reasons. Accordingly, when the optical disk is mounted on the driving motor, a correction device for automatically matching the rotation center is started.

In a rotating storage device capable of attaching and detaching an optical disk such as an optical disk drive, it is the spindle motor that rotates the optical disk used as an information storage medium. The optical disk having the hollow portion is rotated together with the spindle motor so that its bottom surface is seated on the turntable provided at the top of the spindle motor and its hollow portion is fitted to the protrusion formed at the center of the turntable. However, since optical discs are mass-produced with flexible materials such as plastics, the dimensions of the inner holes are not uniform, and when the mass-produced optical discs are mounted on the spindle motor, a gap is generated between the hollow inner peripheral surface of the optical disc and the protrusion of the turntable. It is a reality.

If a gap occurs between the inner hole of the optical disc and the projection of the turntable, the center of rotation of the optical disc will not coincide with the center of rotation of the spindle motor, which causes errors in reading data written to the disc or writing data to the disc. Will occur.

Designed to solve this problem is the conventional spindle motor of FIG. In this conventional spindle motor, a plurality of hooked toenails 2b are formed on the circumferential surface of the projection 2a of the turntable 2 in contact with the hollow inner circumferential surface 1a of the optical disc 1. As shown in FIG. 11, in the conventional spindle motor, an elastic claw 2b having elasticity is formed on the outer circumferential surface of the protrusion 2a of the turntable 2. Although the size of the toenails 2b is larger than that of the inner hole of the disc 1, the hooks 2b are formed in the shape of hooks, so when the optical disc 1 is inserted into the projection 2a of the turntable, the hooks of the hooks 2b are provided. The light is collected at the center of the rotating shaft and abuts against the hollow inner circumferential surface 1a of the optical disk. At this time, a plurality of hook-shaped toenails 2b, which are elastic bodies, push the hollow circumferential surface of the optical disk outward from the center of rotation while balancing the force due to the elastic force to restore the original shape. By this action, the claw 2b pushes the optical disk hollow surface radially outward so that the center of rotation of the disk coincides with the center of rotation of the spindle motor.

However, since optical discs are generally made of a soft material such as plastic, damage, deformation, and wear may occur during manufacturing, handling, and storage. If the optical disk is damaged, deformed, worn, etc., the center of gravity of the optical disk is out of the rotation center of the optical disk. If the center of gravity of the optical disc rotates at a high speed out of the rotation center of the optical disc, the centrifugal force increases greatly, and the centrifugal force becomes larger than the elastic or restoring force of the toenails formed on the turntable protrusion. The phenomenon of out of place will occur.

If the center of the optical disc is out of the center of rotation of the spindle motor, an error may occur that the data recorded on the optical disc may not be read or the data may not be recorded at a designated position of the optical disc. In other words, when the centrifugal force is weak, it does not matter much, but when the excessive centrifugal force occurs, a problem arises in that the optical disc drive cannot function normally.

In order to overcome this problem, a method of sufficiently increasing the elastic force of the toenail may be applied. However, if the elastic force of the toenail is sufficiently increased, the inner hole of the optical disc is strongly fixed to the protrusion of the turntable, and thus, the optical disc cannot be replaced smoothly. This disadvantage causes the loss of the original function of storing and playing back information for each optical disc while replacing the optical disc.

The present invention was developed to solve the above problems, an object of the present invention is to ensure that the center of rotation of the disk even in strong centrifugal force so that the slide cone is in contact with the entire hollow portion of the disk without disturbing the smooth exchange operation of the disk The present invention provides a spindle motor that is automatically adjusted to substantially coincide with the center of rotation of the spindle motor. The turntable ensures that the turntable rotates reliably with the axis of rotation, while at the same time supporting the slide cone, which is in full contact with the hollow of the disc, for smooth sliding motion. It is to provide a spindle motor having a cone support in the center.

Still another object of the present invention is to provide a spindle motor in which the yoke is disposed and a stepped surface is formed on the inner circumferential surface of the slide cone to prevent the slide cone from escaping out of the cone support in the axial direction. To arrange. At this time, by attaching a clamp magnet on the yoke may form a surface for mounting the yoke and the clamp magnet together.

Still another object of the present invention is to provide a spindle motor which can stably support a slide cone by elasticity by arranging two or more elastic levers in the aforementioned spindle motor.

It is another object of the present invention to provide a spindle motor which can start rotation without the information storage medium slipping when the spindle motor starts to rotate. Still another object of the present invention is to provide a spindle motor having a small rotor portion. It is to provide a spindle motor having a turntable capable of mounting a large disk.

It is another object of the present invention to provide an information storage device that can stably record or reproduce information on a disc by using a spindle motor that is not affected by an increase in the centrifugal force of the disc and which is easily mounted and detached. .

In order to achieve the above object, the present invention provides a spindle motor for rotating a removable information storage medium having a hollow portion, wherein a rotation shaft and an outer circumferential surface that can contact the inner circumferential portion of the hollow portion of the information storage medium are substantially in contact with each other. A slide cone including a storage medium contact portion formed in an annular shape extending downward in the axial direction, a substantially cylindrical cone support portion through which an axial movement can be guided by the inner circumferential surface, and a bottom surface of the information storage medium. A substantially cylindrical storage medium mounting portion having a top surface formed thereon, and a substantially annular shape which is connected to an inner circumferential surface of the storage medium mounting portion so as to receive the slide cone when the slide cone comes down in the axial direction, and has a central portion recessed therein. Cone receiving portion of the, and to protrude upward in the axial direction in the center of the cone receiving portion The inner peripheral surface of the turn table including a substantially cylindrical shaft support portion which is supported on the rotatable shaft is supported for rotation with the outer circumferential surface is inserted to the inner peripheral surface and the sliding movement of the cone portion and; The body is bent and disposed below the slide cone so as to push up the slide cone by elasticity in a space formed between the cone receiving portion and the slide cone so that one end of the cone receiving portion or the cone supporting portion of the slide cone is disposed. And a lever integrally formed with the.

The above-described spindle motor according to the present invention further comprises a yoke fixed to an upper portion of the shaft support; The hollow surface of the inner side of the slide cone is formed in a stepped structure; An upper surface constituting the inner circumferential surface of the storage medium contact portion, a lower surface constituting the inner circumferential surface of the cone support portion, and a step surface connecting the upper surface and the lower surface, wherein the upper surface is configured to accommodate the yoke; It is formed in a radial direction wider than the surface characterized in that the step surface is in contact with the yoke when the information storage medium is removed. At this time, it may further include a clamp magnet attached to the upper portion of the yoke and may further include a disk clamp formed of a metal plate at a position corresponding to the clamp magnet.

In the above-described spindle motor according to the present invention, it is preferable that at least two said levers are formed around the outer circumferential surface of the shaft support portion, and in the above-described spindle motor according to the present invention, at least one lever is It may be formed integrally with the cone receiving portion and at least one lever may be formed integrally with the cone support portion.

In the above-described spindle motor according to the present invention, it is preferable that a rubber plate is further attached to the upper surface of the storage medium mounting portion so that the bottom surface of the information storage medium abuts upon mounting of the information storage medium. The above-mentioned spindle motor according to the present invention, comprising: a rotor magnet; And a rotor case rotating together with the rotation shaft and including a cylindrical portion on which the rotor magnet is mounted, wherein the outer circumferential surface of the cylindrical portion of the rotor case is radially inward from the cylindrical outer circumferential surface of the storage medium mounting portion.

The present invention also provides a pickup apparatus including the above-mentioned spindle motor, an information recording unit for recording information on the information storage medium, and an information reproducing unit for reproducing information recorded on the information storage medium; A controller for controlling movement of the pickup device; It provides a data storage device further comprises; a signal converter for converting the signal transmitted from the pickup device to a predetermined signal.

Therefore, the spindle motor according to the present invention keeps the center of the optical disc in the high speed rotation to be consistent without departing from the center of rotation of the spindle motor, thereby minimizing errors in reading or writing data to the optical disc even in the high speed rotation optical disc drive. There is an effect of facilitating replacement of the optical disk.

In addition, the present invention has the effect of preventing the flow that can occur in the radial direction of the rotary shaft and reduce the instability due to optical disk rotation by adopting a method of fixing the slide cone to the turntable instead of directly fixing the slide cone to the rotary shaft.

In addition, the present invention has the effect of providing a structure of a thinner and smaller spindle motor by forming an elastic push lever for pushing the slide cone around the turntable shaft support, and has the effect of improving productivity and assembly.

In addition, the present invention has the effect of providing a compatibility that can adopt a spindle motor having a smaller rotor portion in the optical disk drive.

The terms or words used in this specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors can properly define the concept of terms in order to best explain their invention in the best way possible. Based on the principle, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Configurations shown in the embodiments and drawings described herein are only one of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be variations and variations.

In addition, in describing the embodiments of the present invention in the present specification and claims, words such as top, bottom, bottom, top, left, right, inside, and outside may be used as relative positions or directions between respective components or parts, and relative to the drawings. It should be understood that it is used to describe the position or direction.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partial cross-sectional view of the spindle motor showing a state before mounting the optical disk according to an embodiment of the present invention, Figure 2 is a partial cross-sectional view showing a state after mounting the optical disk in the spindle motor of FIG.

As shown in FIGS. 1 and 2, the spindle motor is divided into a stator part 100 fixed to an optical disc drive and a rotor part 200 rotating together with a rotating shaft.

First, the stator part 100 includes a core 110, a winding 115, a circuit board 120, a bracket 130, a bearing housing 140, a cap 145, a rotation shaft 150, a washer 160, and a sliding surface. It is composed of a bearing 170, the trust plate 180 and assembled sequentially. In detail, the rotation shaft 150 is inserted into the sliding bearing to rotate and the sliding bearing ring 170 is disposed and fixed in the bearing housing 140. The bearing housing 140 is formed in a cylindrical shape, and a stator 190 is disposed on an outer circumferential surface of the bearing housing 140. The stator 190 generally includes a plurality of cores 110 and a winding 115 surrounding the cores 110. By inserting the cap 145 into the lower opening of the cylindrical bearing housing 140 or by integrally forming a bearing housing in a cup shape (not shown), the sliding bearing 170 in which the rotating shaft 150 is inserted into the bearing housing 140 is provided. Take a seat. When the cap 145 is used to block the lower opening of the bearing housing 140, the washer 160 is usually disposed on the upper portion of the cap 145, and when the cup-shaped bearing housing is used, the bearing housing 140 is normally The lower cylindrical wall surface is formed into a stepped surface so that the washer 160 is disposed on the stepped surface and fitted to the small diameter portion of the rotating shaft 150. The sliding bearing is a porous-containing metal bearing disposed so that the lowermost end of the cylindrical bearing abuts on the upper surface of the washer 160 and the cylindrical sliding bearing 170 is inserted into the bearing housing 140 so that the outer circumferential wall surface of the cylindrical bearing is the bearing housing 140. ) Against the inner circumferential surface. The thrust plate 180 is disposed on the bottom surface of the cap 145 or the bearing housing 140 to be in contact with the bottom end of the rotation shaft 150. The bearing housing 140 is inserted and fixed to the cylindrical protrusion of the bracket 130, and the upper circumferential surface of the protrusion is disposed to support the core 110, and the circuit board 120 is disposed on the upper surface of the bracket 130 under the core 110. ) Is placed.

Secondly, the rotor part 200 includes a rotor case 210, a rotor magnet 220, a turntable 230, a rubber plate 240, a clamp magnet 250, a slide cone 260, a trust magnet 270, and a washer ( 275), the rotating shaft 150 is assembled sequentially. In detail, the rotor case 210 is formed in a substantially cylindrical shape, and a magnet 220 facing the stator 190 is attached to the cylindrical inner circumferential surface thereof. The rotating shaft 150 is inserted into the upper portion of the sliding bearing 170 in the center of the rotor case, the rotor case 210 and the rotor magnet 220 is formed into a cylindrical shape to rotate together with the rotating shaft 150, the inner peripheral surface of the cylindrical It is fitted to the rotating shaft (150). A thrust magnet 270 is disposed on the outer circumferential surface of the cylindrical portion fixed to the rotation shaft 150, and a washer 275 is disposed in the cylindrical lower end opening.

The turntable 230 is disposed above the rotor case 210, and the optical disk 1, which is an information storage medium, is positioned on the top surface of the turntable 230. A slide cone is disposed on the turntable 230, and a push lever 280 integrally formed from the turntable 230 is disposed to contact and support the lower portion of the slide cone 260. At this time, it is preferable that the outer peripheral surface of the cylindrical portion of the rotor case 210 is located radially inward from the cylindrical outer peripheral surface of the optical disk mounting portion for the application of various small motors.

The slide cone 260 has a substantially annular cone shape, and when the optical disc 1 is seated on the spindle motor, the outer circumferential surface of the optical disc contact portion 260a is in close contact with the inner circumferential portion 1a of the hollow portion of the optical disc 1, The inner circumferential surface of the branch portion 260b forms a sliding surface to guide the axial movement.

The turntable 230 has a cylindrical shaft protruding portion 230a protruding in the center thereof, and the rotation shaft 150 is inserted and fixed, and when viewed in the radial direction, the turntable 230 is formed in a cylindrical shape substantially blocked at the top thereof, and thus the upper surface of the cylinder. An optical disk mounting portion 230b on which the bottom surface of the optical disk 1 may be seated is formed, and a central portion thereof is formed in the center thereof so as to be integrally formed with a lower portion of the cylindrical portion of the shaft support portion 230a, and the optical disk mounting portion 230b. A substantially disk-shaped cone accommodating portion 230c formed integrally with the lower portion of the c) is formed to accommodate the slide cone 260 when the slide cone 260 descends in the axial direction. The shaft support portion 230a of the turntable 230 is fixed so that the inner circumferential surface of the turntable 230 is inserted into the rotary shaft 150 to rotate together with the outer circumferential surface to slide with the inner circumferential surface of the cone support portion 260b of the slide cone 260. In addition, the rubber plate 240 is further attached to the upper surface of the optical disk mounting portion 230b so that the bottom surface of the optical disk 1 seated directly abuts so that the optical disk 1 rotates without slipping when the motor is rotated.

In an embodiment of the present invention, the push lever 280 formed integrally with a part of the cone accommodation portion 230c of the turntable 230 and the body is bent is a cone accommodation portion 230c of the turntable 230 and a slide cone ( It is in contact with the bottom of the cone support 260b of the slide cone 260 to push up the slide cone 260 by elasticity in the space formed between the cone support 260b of the 260.

In addition, a yoke 255 is formed on an upper portion of the cone support 260b of the slide cone 260, and a clamp magnet 250 is attached to an upper surface of the yoke 255, and a hollow inside the slide cone 260. The surface is formed in a stepped structure and is formed of an upper surface constituting the inner circumferential surface of the optical disk contact portion 260a and a lower surface constituting the inner circumferential surface of the cone support portion 260b and a step surface connecting the upper surface and the lower surface. The upper surface is wider in the radial direction than the lower surface to accommodate the yoke 255 and the clamp magnet 250, and the stepped surface is in contact with the lower surface of the yoke 255 when the information storage medium is removed. In order to prevent the axial deviation of the slide cone 260 and to form a seating position of the yoke 255. At this time, although not shown, it includes a disk clamp (not shown) in which a metal plate is formed at a position corresponding to the clamp magnet 250.

1 shows a state before the optical disk 1 is seated on the turntable 230. Components for seating and fixing the optical disc 1 on the turntable 230 are, in detail, a slide cone 260, a turntable 230, a clamp magnet 250, and a disc clamp (not shown). The outer side of the slide cone 260 is made in a conical shape to be in close contact with the inner circumferential surface 1a of the disk 1, and the inner side has a cylindrical hole. A cylindrical pillar formed in the center of the turntable 230 is inserted into the inner hole of the slide cone 260. At this time, one or several levers 280 are formed at the center lower portion of the turntable 230 to apply a force to push the slide cone 260 upward. Thus, the inner circumferential surface 1a of the disk 1 and the outer circumferential surface of the conical shape of the slide cone 260 are always kept in close contact.

2 shows the state after the optical disk 1 is seated on the turntable 230. When the disk clamp (not shown) is operated, a metal is formed in the center of the disk clamp installed in the optical device, and the slide cone 260 in which the optical disk 1 and the optical disk 1 are in close contact by the magnetic force of the clamp magnet 250. This is pushed down along the axial direction and the bottom surface of the optical disk 1 is seated on the upper surface of the rubber plate 240 formed on the turntable 230. At this time, the inner circumferential surface of the hole of the cylindrical protrusion 260b formed in the slide cone 260 and the outer circumferential surface of the cylindrical column 260a formed in the center of the turntable 230 abut a minimum gap so that the slide cone 260 is contacted. Even when sliding in the vertical direction, the flow occurring in the direction perpendicular to the axis is minimized. When the spindle motor starts to rotate, the optical disc 1 also rotates by the frictional force with the rubber plate 240, and even when the center of gravity of the optical disc 1 does not coincide with the center of rotation of the spindle motor, the inner side of the optical disc 1 Since the hole is in close contact with the conical outer circumferential surface of the slide cone 260, the center of the disk is kept in a consistent state without departing from the center of rotation of the spindle motor.

3 is a plan view of the spindle motor shown in FIGS. 1 and 2, wherein the two levers 280 are balanced so that the elastic force that pushes the slide cone 260 in the structure of the spindle motor described above is balanced as shown in FIG. 3. ) Is symmetrically formed around the outer circumferential surface of the shaft support part 230a.

4 is a partial cross-sectional view of the spindle motor showing a state before mounting the optical disk according to another embodiment of the present invention, Figure 5 is a partial cross-sectional view showing a state after mounting the optical disk in the spindle motor of FIG. 4 and 5 illustrate the one illustrated in FIGS. 1 and 2 except that the push lever 280 is not integrally formed with the turntable 230 but is integrally formed with the slide cone 260. It is identical to the structure of the spindle motor of the embodiment.

Therefore, in another embodiment of the present invention, the body is bent push lever 280 is formed integrally at the bottom of the cone support portion 260b of the slide cone 260 and the cone receiving portion 230c and the slide cone of the turntable 230 Except that the contact with the upper surface of the rotor case 210 so as to push the slide cone 260 by elasticity in the space formed between the cone support portion 260b of the same.

In addition, Figure 6 is a plan view of the spindle motor shown in Figures 4 and 5 and the two levers 280 to balance the elastic force to push the slide cone 260 in the structure of the above-described spindle motor as shown in FIG. ) Is symmetrically formed around the outer circumferential surface of the shaft support part 230a.

7 is a partial cross-sectional view of the spindle motor showing a state before mounting the optical disk according to another embodiment of the present invention, Figure 8 is a partial cross-sectional view showing a state after mounting the optical disk in the spindle motor of FIG.

In the spindle motor of FIGS. 7 and 8, two or more push levers 280 are disposed, and one push lever 280 is integrally formed with a part of the cone accommodation portion 230c of the turntable 230 and the body is bent. And the support portion 260b of the slide cone 260 to push up the slide cone 260 by elasticity in a space formed between the cone accommodation portion 230c of the turntable 230 and the cone support portion 260b of the slide cone. A) the other push lever 280 is integrally formed at the bottom of the cone support 260b of the slide cone 260 and the body is bent so that the cone receiving portion of the turntable 230 and the cone of the slide cone In contact with the upper surface of the rotor case 210 so as to push up the slide cone 260 by elasticity in the space formed between the branches (260b). The structure of the other spindle motor is the same as that shown in FIGS. 1, 2, 4, and 5.

FIG. 9 is a plan view of the spindle motor shown in FIGS. 7 and 8, and the cone of the turntable 230 is balanced so that the elastic force that pushes the slide cone 260 in the structure of the spindle motor described above is balanced as shown in FIG. 9. Two levers 280 integrally formed with the receiving portion 230c are symmetrically formed around the outer circumferential surface of the shaft support portion 230a, and two integrally formed at the bottom of the cone support portion 260b of the slide cone 260. The lever 280 is formed symmetrically around the outer circumferential surface of the shaft support part 230a.

Fig. 10 is a sectional view of an optical disc drive employing the embodiments of the present invention described above. As shown in FIG. 10, the optical disc drive includes a spindle 400 for carrying the spindle motor 300 and the optical disc 1 into the optical disc drive, and a driving unit for lifting the spindle motor upward. 500), an optical pickup apparatus 600 for recording information on the optical disc 1 and reading recorded information, a controller 700 for controlling the movement of the optical pickup apparatus, and a signal transmitted from the optical pickup apparatus. It includes a signal converter 800 for converting into a predetermined signal.

According to FIG. 10, the tray 400, which can protrude to the outside of the optical disc drive, serves to carry the optical disc 1 into the optical disc drive. When the optical disc 1 is placed on the tray and power is applied to the optical disc drive, 400 slides into the inside of the optical disc drive and enters the designated position.

When the tray 400 enters the designated position inside the optical disk drive, the spindle motor 300 of the present invention moves upward, and the conical outer circumferential surface of the slide cone 260 of the spindle motor adheres to the inner hole of the optical disk 1. The optical disc 1 is lifted off the tray 400 while being separated. After the optical disc 1 is detached from the tray 400, the disc clamp installed inside the optical disc drive comes into close contact with the clamp magnet 250 of the spindle motor by magnetic force. At this time, the clamp moves the optical disc 1 downward. The bottom surface of the optical disc 1 is brought into close contact with the upper surface of the annular rubber plate 240 attached to the turntable 230. In other words, the upper surface of the optical disk 1 is fixed by the disk clamp, the disk clamp by the clamp magnet 250 is fixed to the spindle motor.

By the operation of the disk clamp, the optical disk 1 is in close contact with the upper surface of the annular rubber plate 240 disposed on the turntable 230, and the optical disk 1 and the slide cone 260 are subjected to a downward force. At this time, the slide cone 260 is forced upward by the elastic action of the push lever 280 integrally formed on the turntable 230 or the slide cone 260. 260 is maintained in close contact with the outer peripheral surface of the conical shape. When power is supplied to the spindle motor, the spindle motor starts to rotate. At this time, the optical disk 1 seated on the turntable 230 of the spindle motor rotates together with the spindle motor while being held in close contact with the slicker and the disk clamp. When the center of gravity of the optical disc 1 does not coincide with the center of rotation of the spindle motor, the centrifugal force of the optical disc 1 increases rapidly in proportion to the increase in the rotational speed of the spindle motor. At this time, the centrifugal force of the optical disc 1 is increased so that even if the optical disc 1 tries to flow in a direction perpendicular to the rotational axis 150 of the spindle motor, the inner cylindrical surface of the slide cone 260 may support the shaft support of the turntable 230. The optical disc 1 is prevented from flowing in the perpendicular direction because it is in close contact with the cylindrical outer circumferential surface.

Although the present invention has been shown and described with reference to the preferred embodiments as described above, it is not limited to the above embodiments and those skilled in the art without departing from the spirit of the present invention. Of course, various modifications and variations are possible within the technical spirit of the present invention and the equivalent scope of the claims to be described below, and the present invention provides a circular optical disk having a hollow portion as well as an optical disk drive using an information storage medium. It includes a spindle motor that can use information storage media of various shapes and a rotating information storage device that can be detachably mounted.

1 is a partial cross-sectional view of a spindle motor showing a state before mounting an optical disk according to an embodiment of the present invention;

Figure 2 is a partial cross-sectional view showing a state after mounting the optical disk in the spindle motor of Figure 1,

3 is a plan view of the spindle motor shown in FIGS. 1 and 2;

4 is a partial cross-sectional view of a spindle motor showing a state before mounting an optical disk according to another embodiment of the present invention;

5 is a partial cross-sectional view showing a state after mounting the optical disk in the spindle motor of FIG.

6 is a plan view of the spindle motor shown in FIGS. 4 and 5;

7 is a partial cross-sectional view of the spindle motor showing a state before mounting an optical disk according to another embodiment of the present invention;

8 is a partial cross-sectional view showing a state after mounting the optical disk in the spindle motor of FIG.

9 is a plan view of the spindle motor shown in Figures 7 and 8,

10 is a sectional view of an optical disk drive employing the embodiments of the present invention described above;

11 is a partial cross-sectional view of a conventional spindle motor.

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

1: optical disc 1a: hollow part of optical disc

100: stator part 150: rotating shaft

200: rotor portion 210: rotor case

230: turntable 230a: shaft support of the turntable

230b: Optical disc mounting portion of the turntable 230c: Slide cone receiving portion of the turntable

240: rubber plate 250: clamp magnet

260: slide cone 260a: optical disk contact portion of the slide cone

260b: cone support portion of the slide cone 280: push lever

Claims (8)

In a spindle motor for rotating a removable information storage medium having a hollow portion: A rotating shaft; A storage medium contact portion formed in an annular shape in which an outer circumferential surface which is in contact with the inner circumferential portion of the hollow portion of the information storage medium extends substantially downward in the axial direction, and a substantially cylindrical shape in which axial movement can be guided by the inner circumferential surface. A slide cone including a cone support portion; A substantially cylindrical storage medium mounting portion having an upper surface on which the bottom surface of the information storage medium is seated, and a central portion on an inner circumferential surface of the storage medium mounting portion to accommodate the slide cone when the slide cone is lowered in the axial direction. A substantially annular cone-receiving portion formed in a recess and protruding upwardly in the center of the cone-receiving portion so that the inner circumferential surface is supported to rotate with the rotation shaft inserted and the outer circumferential surface slides with the inner circumferential surface of the cone support portion. A turntable comprising a substantially cylindrical axial support supported; The body is bent and disposed below the slide cone to push up the slide cone by elasticity in a space formed between the cone accommodation portion and the slide cone, one end of the cone receiving portion or the cone of the slide cone. And a lever integrally formed with the branch. 2. The apparatus of claim 1, further comprising a yoke fixed on top of the shaft support; The hollow surface of the inner side of the slide cone is formed in a stepped structure; An upper surface constituting the inner circumferential surface of the storage medium contact portion, a lower surface constituting the inner circumferential surface of the cone support portion, and a step surface connecting the upper surface and the lower surface, wherein the upper surface is configured to accommodate the yoke; Spindle motor, characterized in that the radially wider than the surface and the step surface is in contact with the yoke when the information storage medium is removed. The spindle motor of claim 2, further comprising a clamp magnet attached to the yoke and a disk clamp having a metal plate formed at a position corresponding to the clamp magnet. The spindle motor according to any one of claims 1 to 3, wherein at least two of the levers are formed around an outer circumferential surface of the shaft support portion. 5. The spindle motor of claim 4, wherein at least one lever is integrally formed with the cone receiving portion and at least one lever is integrally formed with the cone support portion. The spindle according to any one of claims 1 to 3, wherein a rubber plate is further attached on the upper surface of the storage medium mounting portion so that the bottom surface of the information storage medium abuts upon mounting of the information storage medium. motor. 4. The rotor according to any one of claims 1 to 3, further comprising: a rotor magnet; And a rotor case rotating together with the rotation shaft and including a cylindrical portion on which the rotor magnet is mounted, wherein the outer circumferential surface of the cylindrical portion of the rotor case is located radially inward from the cylindrical outer circumferential surface of the storage medium mounting portion. The spindle motor of any one of claims 1 to 3; A pickup device including an information recording unit for recording information on the information storage medium and an information reproducing unit for reproducing the information recorded on the information storage medium; A controller for controlling movement of the pickup device; And a signal conversion unit converting the signal transmitted from the pickup device into a predetermined signal.

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