Defect detection apparatus

Details Defect detection apparatus Defect detection apparatus

2008-04-22

2008-04-22

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

Reexamination Certificate

active

07362674

ABSTRACT:
During a predetermined period of time after the operation of an optical disc drive has changed from recording to playback or from playback to recording, a first monomulti circuit outputs a pulse signal according to the operation change of the optical disc drive. On receipt of the pulse signal, a capacitor included in an integration circuit is short-circuited at a predetermined reference voltage to fix the output value of the integration circuit at the reference voltage. After the period has passed, on receipt of a pulse signal outputted from a second monomulti circuit, a resistor included in the integration circuit is short-circuited, and an envelope signal is integrated with a time constant being reduced, whereby detection of a false defect signal is avoided, and defect detection can be speedily restarted.

REFERENCES:
patent: 7023777 (2006-04-01), Miyazaki et al.
patent: 7230897 (2007-06-01), Izumi
patent: 2003-196853 (2003-07-01), None

Affiliated with

Also associated with

Rating

Defect detection apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Defect detection apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Defect detection apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2791173