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Warping detection of disk, its control and controller

A control method and optical disc technology, applied in the direction of optical recording/reproduction, head configuration/installation, instruments, etc., can solve the problem of affecting the stability of optical disc reading and writing, shortening the service life of the main shaft motor and servo mechanism of the optical disc drive, and unfavorable Disc data reading and burning problems

Active Publication Date: 2005-12-28
MICRO-STAR INTERNATIONAL
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  • Abstract
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Problems solved by technology

And because of the imbalance in the axial direction of the warped optical disc 2, when it rotates at a high speed, it will generate a lot of noise and vibration, and shorten the service life of the optical disc drive spindle motor and servo mechanism, and affect The stability when reading and writing to the optical disc is not conducive to the reading and burning of optical disc data

Method used

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  • Warping detection of disk, its control and controller
  • Warping detection of disk, its control and controller
  • Warping detection of disk, its control and controller

Examples

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Embodiment Construction

[0021] The foregoing and other technical contents, features and effects of the present invention will be clearly understood in the following detailed description of a preferred embodiment with reference to the accompanying drawings.

[0022] refer to figure 2 Shown is a preferred embodiment of the digital signal processing device 3 of the present invention, which is set in an optical disc drive 1 to detect and control the maximum rotational speed of the optical disc.

[0023] What should be explained first is that the optical disc drive 1 includes an optical read-write head 10 on which a plurality of photodetectors A, B, C, D, E, F, G, H are arranged, when the optical disc drive 1 reads a Disc 2, such as image 3 As shown, the arrangement positions of the plurality of photodetectors A, B, C, D, E, F, G, H on the optical head 10, and the relative positions of the plurality of photodetectors A~H to the optical disc 2 Location. When photodetectors A to D are positioned on the...

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Abstract

A method for controlling optical disc warping includes using a low pass filter to filter off high frequency noise in focus error signal generated under focusing state of optical disc, using a DC level circuit to remove off DC composition is said signal, comparing said signal to a threshold and judging whether optical disc is warped or not according to compared result, controlling the highest speed of optical disc as per the judged result.

Description

technical field [0001] The present invention relates to a disc warping detection and control method and its device, in particular to a method for determining whether the disc is warped by detecting the focus error signal generated by the disc, and then timely limiting the maximum rotational speed of the disc to increase the reading speed of the disc drive. Disclosed are a disc warping detection and control method and device for stabilizing data writing and reducing noise and vibration during the operation of an optical disc drive. Background technique [0002] Due to factors such as manufacturing errors, moisture, sunlight or heavy pressure, the disc may change its appearance such as figure 1 The warpage shown is such that when the optical disk 2 is placed on the turntable 40 of the optical disk drive, it is not parallel to the surface of the turntable 40 but has a slope. And because of the imbalance in the axial direction of the warped optical disc 2, when it rotates at a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09
Inventor 黄炳凯王政斌
Owner MICRO-STAR INTERNATIONAL
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