Apparatus and method of detecting defects on optical...

Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval

Reexamination Certificate

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C369S047140

Reexamination Certificate

active

10336017

ABSTRACT:
An apparatus of detecting defects on an optical recording medium includes a defect signal generating circuit for generating a corresponding defect signal according to a surface defect of the optical recording medium, a first synchronous signal generator for generating a first synchronous signal, a defect signal locating circuit, a delay signal generating circuit, and an OR gate. The defect signal includes at least one pulse, whose width corresponds to the physical width of a surface defect. The delay signal generating circuit generates a delay signal corresponding to each pulse when the spacing between two adjacent pulses is smaller than a preset value. An OR operation is performed to the delay signal and the defect signal to obtain a defect extension signal. The first synchronous signal and a second synchronous signal for separating data recording sectors of the optical recording medium are employed to detect widths and addresses of surface defects.

REFERENCES:
patent: 5841749 (1998-11-01), Sako
patent: 5867466 (1999-02-01), Igarashi et al.
patent: 6577569 (2003-06-01), Yamamoto et al.
patent: 6904008 (2005-06-01), Kawashima et al.

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