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Auto balancing apparatus for disk drive with guide

a technology of auto balancing apparatus and disk drive, which is applied in the direction of data recording, recording on magnetic disks, instruments, etc., can solve the problems of unbalanced disk rotation, inability to implement accurate signal recording and reproducing operation, and up and down

Inactive Publication Date: 2008-01-01
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0028]Accordingly, it is an object of the present invention to provide an auto balancing apparatus for a disk drive, which is capable of implementing an accurate balancing operation to automatically correct unstable rotation of a disk by properly guiding the movements of the balls used for an auto balancing apparatus.
[0029]It is another object of the present invention to provide an auto balancing apparatus for a disk drive, which makes it possible to decrease the occurrence of a self-excited vibration by preventing the balls from being slid during an auto balancing operation.
[0030]It is another object of the present invention to provide an auto balancing apparatus for a disk drive which is capable of preventing the balls used for an auto balancing operation from being moved in a certain direction when the apparatus is not driven.
[0031]It is another object of the present invention to provide an auto balancing apparatus for a disk drive, which is capable of decreasing the space needed for installing an auto balancing unit therein and the driving force required for rotating a disk.

Problems solved by technology

As a disk drive is designed to rotate at a high speed, a disk rotation unbalance problem(an up and down movement of a disk) occurs when a disk is rotated at a high speed.
In the conventional art, it is impossible to implement an accurate signal recording and reproducing operation due to the above-described disk unbalance rotation problems.
The above-described disk unbalance rotation generally occurs due to a non-uniformly fabricated disk.
As the disk is designed to rotate at a high speed, the disk unbalance problem is considered as an important problem.
In the case that a disk is not accurately mounted on a turntable and is rotated, the above-described disk unbalance problem may occur.
Namely, when the rotation of the disk exceeds a certain speed and an unbalance disk rotation problem occurs, the balls 10 are moved to a portion in which a certain resonance occurs.
First, the balls move freely in the interior of the ball casing in the radial direction, and the rotation cycle of the turntable and the rotation cycle of the balls are different. As a result, a self-excited vibration occurs, which makes it is impossible to implement a balancing operation.
The attachment of the balls to the magnets results in an improper balancing operation.
As a result, the balls do not properly race on the racing face of the ball casing, and it is impossible to implement a balancing operation.
Thus, large space for installing the above-described elements is required, and the entire height of the disk drive apparatus is increased.
Furthermore, when separately forming the spindle motor, the ball casing and the turntable, the total weight of the elements which are rotated by the spindle motor is increased, and the power consumption for driving the spindle motor is increased.

Method used

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  • Auto balancing apparatus for disk drive with guide
  • Auto balancing apparatus for disk drive with guide
  • Auto balancing apparatus for disk drive with guide

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0050]As shown in FIGS. 2 through 4, in an auto balancing apparatus for a disk drive according to the present invention, a rotary shaft 25 is rotatably installed on an upper surface of a substrate 20 in a vertical direction, and a bearing 22 is inserted onto a lower outer surface of the rotary shaft 25.

[0051]A turntable 35 on which a disk is mounted is inserted onto an upper portion of the rotary shaft 25.

[0052]Therefore, the rotary shaft 25 and the turntable 35 are integrally rotated.

[0053]A clamp 30 for fixing the disk is installed at an upper portion of the turntable 35. In addition, a circular shape ball casing 50 is installed below the turntable 35. The casing 50 is extended from an outer lower end portion of the turntable 35 and is bent towards center portion of the turntable 35. Then the casing 50 is extended and bent towards the lower surface of the turntable 35 and is extended to the lower surface of the turntable 35.

[0054]Namely, the upper surface of the ball casing 50 is ...

second embodiment

[0074]As shown in FIGS. 5 and 6, in the present invention, a magnet 66 is installed in the interior of the ball casing 60 formed on the lower surface of the turntable 35, namely, on the floor surface of the racing space 61 which receives the balls 62 therein, and an inclined step portion 65 is formed on an outer side portion in the racing space 61.

[0075]The inclined step portion 65 is extended from an outer end portion of the magnet 66 toward the racing face 61i and includes a guide inclined surface 65′ formed at a portion neighboring with the magnet 66, and a plane surface 65″ formed at a portion neighboring with the racing face 61i.

[0076]The operation of the auto balancing apparatus for a disk drive according to a second embodiment of the present invention will be explained.

[0077]When the disk is rotated at a lower speed, the balls 62 collide with the magnet 66, so that the balls 62 are not moved.

[0078]In this state, when the disk is rotated at a higher speed, the balls 62 roll al...

third embodiment

[0082]The auto balancing apparatus for a disk drive according to the present invention will be explained.

[0083]As shown in FIGS. 7 and 8, in the third embodiment of the present invention, a magnet 76 is installed in the interior of the ball casing 70 installed on the lower surface of the turntable 35 and on the upper surface of the racing space 71 which contacts with the lower surface of the turntable 35 and receives the balls 70 therein, and an inclined step portion 75 is formed on an outer side of the ceiling surface in the racing space 71.

[0084]A lower plate 78 made of a metallic material is installed at a lower portion in the racing space 71.

[0085]The lower plate 78 becomes a floor of the racing space 71, and the balls 72 do not slide in the racing space 71 by the lower plate 78.

[0086]The inclined step portion 75 is extended from an outer end portion of the magnet 76 to the racing face 71i and includes a guide inclined surface 75′ formed at a portion neighboring with the magnet ...

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Abstract

An auto balancing apparatus for a disk drive including a ball casing having a circular racing space installed concentrically with respect to a rotation member capable of rotating a disk. A plurality of balls roll along a racing face formed in the racing space for implementing a balancing operation. A guide member guides the movements of the balls. The proper guiding of the movements of the balls used for an auto balancing apparatus automatically corrects an unstable rotation of a disk and provides an accurate balancing operation.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an auto balancing apparatus for a disk drive, and in particualr to an auto balancing apparatus for a disk drive which is capable of automatically balancing an up and down movement of a disk when a disk mounted on a turntable is rotated.[0003]2. Description of the Background Art[0004]As a disk drive is designed to rotate at a high speed, a disk rotation unbalance problem(an up and down movement of a disk) occurs when a disk is rotated at a high speed.[0005]In the conventional art, it is impossible to implement an accurate signal recording and reproducing operation due to the above-described disk unbalance rotation problems.[0006]The above-described disk unbalance rotation generally occurs due to a non-uniformly fabricated disk. As the disk is designed to rotate at a high speed, the disk unbalance problem is considered as an important problem.[0007]In the case that a disk is not accurately...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G11B17/028G11B17/02G11B17/038G11B25/04
CPCG11B17/038G11B25/043G11B17/02
Inventor SONG, GEUN HYUK
Owner LG ELECTRONICS INC