KR20090041935A

KR20090041935A - Turntable of spindle motor

Info

Publication number: KR20090041935A
Application number: KR1020070107735A
Authority: KR
Inventors: 김용태
Original assignee: 엘지이노텍 주식회사
Priority date: 2007-10-25
Filing date: 2007-10-25
Publication date: 2009-04-29

Abstract

A turntable of a spindle motor is provided to record information in the exact site of a disc by contacting a contact protrusion formed in a claw with the outer circumference of a coupling pipe. A turn-table of a spindle motor comprises: a rotary shaft(140); and a turn-table(170) rotating with the rotary shaft by being coupled in the rotary shaft and supporting a disc. The turn table comprises: a coupling pipe having inner circumference coupled in the rotary shaft, and outer circumference in which the inner circumference of the disc is inserted and supported; a table being extended and formed outward in the outer circumference of the coupling pipe; a connection bar with one end integrally formed in the table and the other end positioned in the outer circumference of the coupling pipe; a plurality of claws having elasticity with having a support bar in which the inner circumference of the disc is contacted and supported; and a unit preventing the claw from being moved toward the coupling pipe due to the disc.

Description

Turntable of spindle motor {TURNTABLE OF SPINDLE MOTOR}

1A and 1B are cross-sectional views of a turntable of a conventional spindle motor.

2 is a cross-sectional view of a spindle motor employing a turntable according to an embodiment of the present invention.

3A is a perspective view of the turntable shown in FIG. 2.

3B is a cross-sectional view taken along the line “A-A” of FIG. 3A.

4 is a cross-sectional view of a turntable according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: base 120: bearing housing

130: bearing 140: rotating shaft

150: stator 160: rotor

170: turntable 171: coupling pipe

173: Table 175: Claw

177: contact protrusion

The present invention relates to a turntable of a spindle motor.

The spindle motor functions to rotate the disk so that a linearly moving optical pickup can read the data recorded on the disk.

The disk is fixed to the turntable, which is formed with a claw which supports the center of the disk to coincide with the center of the rotation axis. The claws are of an Umbrella type whose end faces downward of the turntable and an Under Rib type whose end faces upward of the turntable.

A conventional turntable in which an under rib claw is formed will be described with reference to FIGS. 1A and 1B. 1A and 1B are cross-sectional views of a turntable of a conventional spindle motor.

As shown in FIG. 1A, the turntable 10 has an inner circumferential surface coupled to a rotating shaft (not shown), and an outer circumferential surface at the outer circumferential surface of the coupling tube 11 and the coupling tube 11 in which the inner circumferential surface of the disk 50 is inserted and supported. A plurality of claws 15 extending and formed to contact the table 13 on which the disk 50 is mounted and the inner peripheral surface of the disk 50 to support the center of the disk 50 to coincide with the center of the rotating shaft are provided. Have

The claw 15 is integrally formed at one end of the table 13 and the other end is located at the outer circumferential side of the coupling pipe 11 to connect the connection bar 15a and the connection bar 15a parallel to the table 13. It has elasticity while having a support bar (15b) bent vertically at the other end of the).

The distance from the center of the turntable 10 to the outer surface of the support bar 15b of the claw 15 is slightly longer than the radius of the disk 50. Therefore, when the disk 50 is inserted into the coupling pipe 11 and mounted on the table 13, the support bar 15b is pushed inwardly inwardly of the turntable 10 around the lower end portion, and then the elastic force is applied by the elastic force. While returning to the original state, the outer surface contacts the inner circumferential surface of the disk 50 to elastically support the disk 50.

However, in the conventional spindle motor as described above, due to the eccentricity of the inner diameter of the disk 50, of the plurality of claws 15, the supporting bar 15b of some claws 15 is excessively toward the center side of the turntable 10. Pushed. Then, since the inner circumferential surface of the disk 50 is not uniformly elastically supported by the claw 15, the center of the disk 50 does not coincide with the center of the turntable 10, that is, the center of the rotation axis. Therefore, there is a disadvantage in that the reliability of the product is degraded, such as an error when recording information on the disc 50 or reproducing the information from the disc 50.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to provide a turntable of the spindle motor that can improve the reliability by configuring to match the center of the disk and the center of the rotation axis accurately Is in.

In the spindle motor according to the present invention for achieving the above object, in the spindle motor having a rotary table, a turntable coupled to the rotary shaft to rotate integrally with the rotary shaft, the disk is mounted and supported;

The turntable, the inner circumferential surface is coupled to the rotary shaft and the outer circumferential surface is coupled to the inner peripheral surface of the disk coupling support; A table extending outward from an outer circumferential surface of the coupling pipe to mount the disk; One end side is formed integrally with the table, and the other end side is elastically having a connecting bar located on the outer peripheral surface side of the coupling pipe and a vertically extending from the other end of the connecting bar, and having a support bar on which the inner circumferential surface of the disk is in contact and supported. A plurality of claw (Claw) having a; And means for preventing the claw from being pushed by the disk to the coupling side more than a predetermined time.

Hereinafter, a turntable of a spindle motor according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown, the cylindrical bearing housing 120 is standing on one vertical direction of the base 110.

Hereinafter, in referring to the surfaces of the components, the surface facing upward in the vertical direction of the base 110 with respect to the base 110 is referred to as the 'upper surface, the surface facing downward'.

The bearing 130 is press-fitted and fixed to the inner circumferential surface of the bearing housing 120, and the lower side of the rotating shaft 140 is supported and rotatably installed on the bearing 130. The stator 150 is fixed to the bearing housing 120, and the rotor 160 is fixed to the rotating shaft 140.

The stator 150 has a core 151 fixed to the outer circumferential surface of the bearing housing 120 and a coil 155 wound around the core 151, and the rotor 160 is exposed to the upper side of the bearing housing 120. It is coupled to the rotor yoke 161 and the rotor yoke 161 fixed to the outer circumferential surface of the rotating shaft 140 and has a magnet 165 facing the stator 150.

Thus, when a current is applied to the coil 155, the rotor 160 is rotated by the electromagnetic field generated between the coil 155 and the magnet 165, thereby rotating the rotating shaft 140.

The turntable 170, which is integrally rotated with the rotation shaft 140, is fixed to the outer circumferential surface of the rotation shaft 140 on the upper side of the rotor yoke 161, and the disk 50 is mounted and supported on the turntable 170.

The lower surface of the bearing housing 120 is provided with a thrust plate 181 which is supported by contacting the lower end of the rotary shaft 140, the thrust plate 181 is to prevent the wear of the rotary shaft 140 and the bearing housing 120 and At the same time, it reduces noise caused by friction.

A ring-shaped support member 183 is fixed to the inner circumferential surface of the bearing housing 120 below the bearing 130, and a ring-shaped washer stopper 185 is installed between the support member 183 and the bearing 130. In addition, a ring-shaped locking path 143 is formed on the outer circumferential surface portion of the rotating shaft 140 corresponding to the washer stopper 185 formed in the center side of the rotating shaft 140. The inner circumferential surface side of the washer stopper 185 is inserted into the locking path 143, whereby the rotation shaft 140 is not separated from the upper side of the bearing housing 120.

On the outer circumferential surface of the rotating shaft 140 above the bearing 130, oil flowing out of the rotating shaft 140 and rising along the outer circumferential surface of the rotating shaft 140 when the rotating shaft 140 rotates leaks to the outside of the bearing housing 120. A stopper 187 is installed to prevent the product from becoming uneven. The rotor yoke 161, which faces the upper surface of the bearing housing 120, has a suction to prevent the rotor 160 and the rotating shaft 140 from rising when the rotating shaft 140 rotates. The magnet 189 is installed.

The turntable 170 will be described in detail with reference to FIGS. 3A and 3B. 3A is a perspective view of the turntable shown in FIG. 2, and FIG. 3B is a cross-sectional view taken along the line “A-A” of FIG. 3A.

As shown, the turntable 170 has a union tube 171, a table 173, and a claw 175.

The coupling pipe 171 is coupled to the inner circumferential surface is pressed into the outer circumferential surface of the rotary shaft 140, the inner circumferential surface of the disk 50 is inserted into the outer circumferential surface is supported. The upper surface of the coupling pipe 171 is formed with a ring-shaped recess (171a) recessed downward, the outer peripheral surface is formed with a plurality of settle grooves (171b) radially with respect to the center of the coupling pipe 171. When the disk 50 is mounted on the turntable 170, the clamp magnet 191 for adsorbing a clamp (not shown) that descends from the upper side of the turntable 170 to support the disk 50 is disposed in the inner path 171a ( 2) and clamp plate 193 are installed.

The table 173 extends radially outward of the coupling pipe 171 on the outer circumferential surface of the coupling pipe 171, and the disk 50 is mounted thereon. In the table 173, a plurality of communication holes 173a communicating with the settling grooves 171b are formed.

The claw 175 has elasticity while having a connection bar 175a and a support bar 175b.

One end of the connecting bar 175a is formed integrally with the table 173 having the communication hole 173a, and the other end is positioned in the settled groove 171b so that the table 173 is parallel to each other. The support bar 175b is bent upwardly at the other end of the connection bar 175a to be perpendicular to the table 173. That is, the support bar 175b is in parallel with the coupling pipe 171.

When the disk 50 is inserted into the outer circumferential surface of the coupling pipe 171 and mounted on the table 173, the outer surface side of the support bar 175b facing the inner circumferential surface of the disk 50 contacts the inner circumferential surface of the disk 50. . Then, the support bar 175b is inclined toward the center of the turntable 170 around the lower end, and then supports the disk 50 while returning to the initial state in the elastic force. As a result, the center of the disk 50 coincides with the center of the rotation shaft 140.

Since an eccentricity exists in the inner diameter of the disk 50, the support bar 175b of some of the claws 175 of the plurality of claws 175 is the center side of the turntable 170 by the eccentricity of the inner diameter of the disk 50, that is, It is pushed excessively to the coupling pipe 171 side. Then, the inner circumferential surface of the disk 50 is not uniformly elastically supported by the claw 175.

The turntable 170 of the spindle motor according to the present embodiment is provided with means for preventing the support bar 175b of the claw 175 from being pushed by the disk 50 toward the coupling pipe 171 by more than a predetermined time.

The means is provided with a contact protrusion 177 protruding toward the coupling pipe 171 on the inner side of the support bar 175b facing the coupling pipe 171. Then, when the support bar 175b is inclined toward the coupling pipe 171 with respect to the lower end of the disc 50 by the eccentricity of the inner diameter of the disc 50, the support bar 175b is pushed toward the coupling pipe 171 by a predetermined or more, as shown in FIG. 3B. , The contact protrusion 177 is in contact with the outer circumferential surface of the coupling pipe 171. Because of this, since the support bar 175b is prevented from being pushed to the side of the coupling pipe 171 more than a predetermined time, the inner circumferential surface of the disk 50 is uniformly elastically supported by the nail 175.

4 is a cross-sectional view of a turntable according to another exemplary embodiment of the present invention, and only the difference from FIG. 3B will be described.

As shown, the contact protrusion 277 is formed to be bent toward the coupling tube 271 at the end of the support bar (275b) to the first bending portion 277a and the first bending portion facing the changing direction of the coupling tube 271 It is formed at the end of 277a and has a second bending portion 277b which faces the longitudinal direction of the coupling pipe 271. That is, the contact protrusion 277 is formed in the form of a bar bent a plurality.

As described above, in the turntable of the spindle motor according to the present invention, when the claw is pushed to the center side of the turntable more than a predetermined time due to the eccentricity of the disc inner diameter, the contact protrusion formed in the claw contacts the outer circumferential surface of the coupling pipe, so that the claw is turned table. It is not pushed more than the predetermined side to the center side. Therefore, since the inner circumferential surface of the disk is uniformly elastically supported by the plurality of claws, the center of the disk coincides with the center of the turntable. This makes it possible to record information in the correct portion of the disc and to accurately reproduce the desired information from the disc, thereby improving the reliability of the product.

In the above, the present invention has been described in accordance with one embodiment of the present invention, but those skilled in the art to which the present invention pertains have been changed and modified without departing from the spirit of the present invention. Of course.

Claims

A spindle motor coupled to the rotary shaft, the spindle motor having a turntable that is integrally rotated with the rotary shaft and mounted on and supported by a disk,

The turntable,

An inner circumferential surface is coupled to the rotary shaft and an outer circumferential surface is coupled to the inner circumferential surface of the disk for insertion and support;

A table extending outward from an outer circumferential surface of the coupling pipe to mount the disk;

One end side is formed integrally with the table, and the other end side is elastically having a connecting bar located on the outer peripheral surface side of the coupling pipe and a vertically extending from the other end of the connecting bar, and having a support bar on which the inner circumferential surface of the disk is in contact and supported. A plurality of claw (Claw) having a;

And a means for preventing the claw from being pushed by the disk to the engaging tube more than a predetermined time.

The method of claim 1,

The means is a turntable of the spindle motor is a contact protrusion protruding from the support bar toward the coupling tube.

The method of claim 1,

The means may be bent from the end of the support bar to the coupling tube side, the first bending portion facing the changing direction of the coupling pipe and the second bending bending formed at the end of the first bending portion in the longitudinal direction of the coupling tube. The turntable of the spindle motor, which is a contact protrusion with a wealth.