Eccentric disk detection apparatus for an optical disk device
AssigneeSamsung Electronics Co., Ltd.
InventorsShin Kgami, Yuichiro Tomishima
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Abstract
An eccentric disk detection apparatus for an optical disk device is provided. The eccentric disk detection apparatus detects eccentricity, as well as determines whether the eccentricity is high or low, by sensing and analyzing the reverse electromotive force. Upon detection of eccentricity, the eccentric disk detection apparatus can adjust the maximum number of revolutions of the disk in accordance to the sensed reverse electromotive force, thereby compensating for the eccentricity of the disk.
Claims19
An eccentric disk detection apparatus for an optical disk device of the type having means for rotating a disk loaded within the optical disk device at a predetermined rotational speed, and a pickup for reading and writing data from and to said disk, said eccentric disk detection apparatus comprising:
- means for generating a reverse electromotive force in proportion to the rotational speed of said rotating means when vibration occurs during rotation of said disk and transmitting a reverse electromotive force signal indicative of the reverse electromotive force generated;
- and
- control means for detecting disk eccentricity, based on the type of disk inserted within the optical disk device and contents recorded on the disk and for controlling the rotational speed of the rotating means in response to a received reverse electromotive force signal.
An eccentric disk detection apparatus for an optical disk device of the type having a motor for rotating a disk loaded within the optical disk device at a predetermined rotational speed, and a pickup for reading and writing data from and to said disk, said eccentric disk detection apparatus comprising:
- an actuator coil in proximity to said pickup for generating a reverse electromotive force in proportion to the rotational speed of said motor when vibration occurs during rotation of said disk and transmitting a reverse electromotive force signal indicative of the reverse electromotive force generated;
- a pickup driver for transmitting at least one control signal to said actuator coil for driving said actuator coil;
- and
- a processor for detecting disk eccentricity, based on the type of disk inserted within the optical disk device and contents recorded on the disk, for receiving the reverse electromotive force signal and for controlling the rotational speed of the motor accordingly.
Dependencies are inferred from the claim text.