Method for preventing an optical recording device from...

Details Method for preventing an optical recording device from... Method for preventing an optical recording device from...

2006-10-10

2006-10-10

Patel, Gautam R. (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S059170

Reexamination Certificate

active

07120100

ABSTRACT:
In a method of detecting defects during a write operation for an optical disk recording device, during a period of time immediately after writing begins, a sub-beam added (SBAD) signal is compared with a reference signal having a second threshold frequency. A defect is identified when a difference between the SBAD signal and the reference signal exceeds either a second upper limit or a second lower limit. Then, after the short period of time has elapsed, a SBAD signal is compared with and a reference signal having a first threshold frequency that is less than the second threshold frequency. A defect is identified when a difference between the SBAD signal and the reference signal exceeds either a first upper limit that is less than the second upper limit, or a first lower limit that is greater than the second lower limit.

REFERENCES:
patent: 4189745 (1980-02-01), Ushio et al.

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