# US 2004/0001422 A1 · Method for reducing the rotation speed of an automatic ball balancing system of an optical disk reading device

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- Number: US 2004/0001422 A1
- Document ID: US20040001422A1
- Status: Published application
- Kind: A1
- Application number: 10/412,527
- Filed: 2003-04-11
- Published: 2004-01-01
- Earliest claimed: 2002-06-28
- Assignees: Lite-On It Corporation
- Inventors: Lih-Hwa Kuo; Jeng-Jiun Chen
- Web page: https://patentgrep.com/patent/US20040001422A1

## CPC

- G11B 17/022: Positioning or locking of single discs
- G11B 25/043: {using rotating discs}
- G11B 33/08: Insulation or absorption of undesired vibrations or sounds
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A method for reducing the stable rotation speed of an automatic ball balancing system is used with an automatic ball balancing system that has a rotor that has an annular track, with at least one ball provided for rotation inside the track. First, an optimum rotation speed ws that is between the unstable critical rotation speed wc of a ball and a working rotation speed w is first determined. In the next step, the rotor is accelerated to the optimum rotation speed ws. Next, the acceleration of the rotor is reduced until the balls are stationary relative to the track, and then the rotor is accelerated to the working rotation speed w.

## Claims

### Claim 1

A method of balancing an automatic ball balancing system in an optical disk reading device, the automatic ball balancing system having a rotor that has an annular track, with at least one ball provided for rotation inside the track, the method comprising:
determining an optimum rotation speed ws that is between the unstable critical rotation speed wc of a ball and a working rotation speed w;
accelerating the rotor to the optimum rotation speed ws;
reducing the acceleration of the rotor until the balls are stationary relative to the track; and
accelerating the rotor to the working rotation speed w.