Disc drive apparatus

Details Disc drive apparatus Disc drive apparatus

2005-01-25

2005-01-25

Korzuch, William (Department: 2653)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053150, C369S053230, C369S044260, C369S044130, C369S124050

Reexamination Certificate

active

06847599

ABSTRACT:
A disc drive apparatus for recording or playing back data onto and from an optical-disc recording medium having a plurality of signal surface areas outputting detected information as reflected detection signals with different amplitudes, the disc drive apparatus including: reflected-light quantity detection means for detecting a total quantity of a light reflected by a signal surface of the optical-disc recording medium and outputting a reflected-light quantity detection signal representing the total quantity; integration means for integrating the reflected-light quantity detection signal and providing an integration output representing a result of integration of the reflected-light quantity detection signal; and identification-signal generation means for comparing the level of the reflected-light quantity detection signal with the level of the integration output used as a threshold value and for outputting an identification signal identifying a specific signal surface area among the signal surface areas as a result of comparison.

REFERENCES:
patent: 4833662 (1989-05-01), Yoda
patent: 5689487 (1997-11-01), Iwanaga

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