Apparatus for detecting abnormal states of laser power...

Details Apparatus for detecting abnormal states of laser power... Apparatus for detecting abnormal states of laser power...

2006-06-13

2006-06-13

Miller, Brian E. (Department: 2652)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S116000, C369S053370

Reexamination Certificate

active

07061844

ABSTRACT:
An apparatus for detecting abnormal states which prevents damage to a laser diode or data recorded on a disc and swiftly correcting the abnormal state. An overflow/underflow detector detects whether overflow or underflow of the laser diode occurs, by comparing a laser diode output power control value, which is output from the laser diode output power control circuit, with an overflow setting value and an underflow setting value. A mode switch switches an operation mode of the laser diode output power control circuit from a recording mode to a reproducing mode, in response to the detection result of the overflow/underflow detector.

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Office Action dated Dec. 14, 2004 issued in a corresponding Japanese patent application.

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