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Apparatus and method for controlling the rotation velocity of an optical disc

A technology of rotation speed and optical disc, which is applied to the recording of information on the magnetic disc, instruments, magnetic recording, etc., can solve the problems that cannot be known a priori, and achieve the effect of avoiding cost and not interfering with the data path

Inactive Publication Date: 2010-06-16
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disc is removable, so the position of the markings on the disc with respect to the rotor cannot be known a priori

Method used

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  • Apparatus and method for controlling the rotation velocity of an optical disc
  • Apparatus and method for controlling the rotation velocity of an optical disc
  • Apparatus and method for controlling the rotation velocity of an optical disc

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Embodiment Construction

[0018] figure 1 A block diagram of an optical disc drive for handling data to / from an optical disc is schematically shown according to an embodiment of the present invention. An optical disc (1) placed on a tray system (not shown in the figure) is rotated by a motor (2). Encoded user data is read from or recorded onto the optical disc (1) by means of an optical pickup unit (OPU) (7). The OPU (7) generates a laser beam (72) through a semiconductor laser, and focuses the laser beam onto the optical disc (1) through a lens system (71). The reflected laser beam modulated by the periodic structure on the optical disc (1) is detected by suitable detection means, such as a photodiode system, also included in the OPU (7). The detection means generate a high-frequency signal (DATA) representing said encoded user data. The further processing of said high frequency signal (DATA) and the positioning of the OPU (7) relative to the optical disc (1) are carried out according to methods kn...

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Abstract

Method and apparatus for controlling the rotation velocity of an optical disc in a wide range of velocities, including low velocities. In a first range of velocities, a first sensor, for example an EMF sensor, is used to control the commutation moments of a turntable motor. For velocities outside the first range, a periodic control signal based on a periodic second signal generated by a second sensor and a mapping between the first and second periodic signal are used. The method and the apparatus are suitable for LightScribe applications.

Description

technical field [0001] The invention relates to a method for controlling the rotational speed of an optical disc. The invention also relates to a device for controlling the rotational speed of an optical disc. Background technique [0002] Regarding the rotation rate of the optical disc, current optical disc drives have been optimized for high rotation rates (>10.000 rotations per minute / RPM). Further optimizations are still taking place, especially in reducing production costs. This means optimizing current turntable motors for high speeds (>10.000 RPM) at low production prices. Most conventional turntable motors in optical disc drives are brushless motors that use electronic commutation of the relative phases of current flowing through the motor coils to control the rotational speed of the motor. Detection of the moment of commutation is achieved by post-sensing the electromotive force (EMF) induced in the motor coil. The magnitude of the signal generated by the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B19/26
CPCG11B19/26G11B19/28
Inventor J·范比南G·霍格扎德
Owner KONINK PHILIPS ELECTRONICS NV