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Disc checking device and disc checking method

An inspection device and re-inspection technology, applied in the direction of digital signal error detection/correction, digital recording/reproduction, etc., can solve the problem of low reliability of inspection results

Inactive Publication Date: 2012-02-08
ALMEDIO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such prior art, since only a part of the recording area of ​​the disk is inspected, there is a problem that the reliability of the inspection result is low.

Method used

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  • Disc checking device and disc checking method
  • Disc checking device and disc checking method
  • Disc checking device and disc checking method

Examples

Experimental program
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Embodiment Construction

[0026] Embodiments of the present invention will be described below with reference to the drawings. figure 1 It is a block diagram showing the configuration of the disc inspection device 10 according to the embodiment of the present invention. This disk inspection apparatus 10 is an apparatus for inspecting whether there is a problem (defect) that makes it difficult to reproduce the disk 100 (for example, DVD, CD, Blu-ray disk, etc.) as a recording medium. The disc inspection device 10 will be described in detail below.

[0027] A disk 100 such as a CD or a DVD to be inspected is driven to rotate by a spindle motor (SP) 12 . The spindle motor 12 is driven by an SP driver 14, and the SP driver 14 is servo-controlled by a servo processor 30 so as to have a desired rotation speed. At this time, the servo processor 30 may rotate the disk 100 at a constant angular velocity or at a constant linear velocity in accordance with an instruction from the system controller 32 .

[0028]...

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Abstract

The invention provides a disc checking device and a disc checking method, wherein the reliability of the checking result is ensured while the checking speed is high. The system controller (32) of the disc checking device performs the steps of a coarse checking step and a fine checking step. During the coarse checking step, the replay of a disc is performed at a certain angular velocity and the error number of the disc is measured. According to the relationship of error numbers with segmented regions, the segmented region with a largest error number is set to be the region for being checked again. A recording region is divided in the radial direction so as to form a plurality of segmented regions. During the fine checking step, the replay of the region for being checked again is performed at a certain angular velocity so as to check the above disc. Meanwhile, the segmented regions are defined in such a way that the deviation coverage of the error numbers of the segmented regions caused by the difference of the linear velocity thereof are converged within an allowed range when the disc is replayed at a certain angular velocity.

Description

technical field [0001] The present invention relates to a disk inspection device and a disk inspection method for inspecting disks. Background technique [0002] Conventionally, recording medium disks such as optical disks capable of recording and reproducing data by irradiating laser light are widely known. In such a disc, the recording quality of data deteriorates due to deterioration over time, and in some cases, it may be difficult to reproduce data, or information may be lost. In a disc archive (Disc Archive) in which various information is recorded and stored on a disc, such information loss due to deterioration of the disc becomes a serious problem. Therefore, in the disc archive, it is required to regularly inspect a large number of discs stored. In addition, at rental shops or second-hand dealers that rent or sell disks, inspection of the disks is also required before the disks are rented or sold. [0003] Due to such a problem, many devices for inspecting disks ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/18
Inventor 久保充正亲松刚
Owner ALMEDIO
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