Disk checking device

Abstract

The invention provides a disk checking device capable of inhibiting the deviation of the checking results between different equipment without the micro adjustment of hardware. The disk checking device comprises an RF signal acquisition mechanism for acquiring RF signals according to the intensity of the reflected light of laser irradiated on the disk; a decoding unit (40) for decoding the input RF signals during the error correcting of RF signals and outputting corrected decoding data and the error rate; and an S / N ratio adjusting unit (42) for enabling the RF signal acquisition mechanism to obtain RF signals and input the degradation value below the S / N ratio to the decoding part (40). The error rate of a reference disk with a known checked quality is converged within a specified range outputted from the decoding unit (40).

Description

technical field [0001] The present invention relates to a disk inspection device 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 disc archiving, it is required to regularly check the quality of a large number of discs stored. In addition, it is also required to check the quality of the disc before renting or selling the disc at a disc rental store or second-hand sales shop that rents or sells the disc. [0003] Due to such a problem, many devices for inspecting...

AI Technical Summary

Problems solved by technology

[0005] However, the amount of error detection depends on the optical power unit and data processing hardware installed in each inspection device, and the results may vary depending on the inspection device even when the same disk is inspected.

As a result, there is a problem that the inspection results vary depending on each inspection device, and the quality cannot be inspected correctly

However, the replacement and fine-tuning of various hardware will cause new problems such as increased cost and increased man-hours

[0006] In addition, Patent Document 1 discloses a technique for improving the error rate by changing the path storage length used in the Viterbi decoding process. However, this technique cannot correct the error sensitivity of the inspection device whose error sensitivity is too low to be appropriate. value

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