Apparatus and method for detecting defects of a recording...

Details Apparatus and method for detecting defects of a recording... Apparatus and method for detecting defects of a recording...

2007-03-06

2007-03-06

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053150

Reexamination Certificate

active

10782352

ABSTRACT:
The apparatus of detecting defects of the present invention includes: a photodetector, detecting a intensity of reflective laser beam and generating a reflective signal; a sample/hold circuit, coupling to the photodetector circuit, sampling and holding the reflective signal; a comparator, coupling to the sample/hold circuit, comparing the sampling and holding result with a default range; and a defect flag generating circuit, coupling to the comparator, generating a defect flag signal. The method of detecting defects of the present invention includes: monitoring a reflective signal (WRF signal) when recording an optical disk; determining if the static region of WRF signal is within a predetermined range; if no, the region is regarded as a defect region, and a defect flag is set.

REFERENCES:
patent: 7-320402 (1995-12-01), None

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